TWI502208B - Electric leakage detection apparatus - Google Patents

Description

Leakage detection device

The invention relates to a leakage detecting device. More particularly, the present invention relates to a leakage detecting device that determines whether a leakage has occurred in an AC circuit based on a detected output of a zero-phase converter.

[Patent Document 1] Japanese Patent Laid-Open No. Hei 10-094161

The leakage resistance breaking device includes a Zero-phase Current Transformer (ZCT) including a ring containing a magnetic body such as a soft magnetic material that constitutes a plurality of primary conductors constituting the AC circuit. a core (core); and a toroidal shape coil wound around the core, the leakage resistance device according to the detection output of the coil at the two ends of the zero-phase converter, that is, an output voltage It is determined whether or not leakage has occurred in the plurality of primary conductors.

When leakage occurs in any of the primary conductors, a difference occurs between the current flowing in the forward direction of the alternating current circuit and the current flowing in the return path, thereby generating a leakage current based on the difference. Further, since the currents of the plurality of primary conductors are totally unbalanced as a whole, the state of the magnetic flux of the core of the zero-phase current converter changes depending on the magnetic flux generated by the leakage current. Thereby, the induced voltage corresponding to the leakage current is detected at both ends of the coil of the zero-phase current transformer.

Further, when no leakage occurs in any of the primary conductors, it is in a so-called equilibrium state, that is, the vector sum of the energization currents of the plurality of primary conductors is zero. In the above equilibrium state, in the zero phase converter There is magnetic flux in the core, but these magnetic fluxes cancel each other out, and the zero-phase converter does not detect the induced voltage as described above. Therefore, by outputting the output voltage across the coil of the zero-phase current transformer as a detection output, it is possible to determine whether or not a leakage current has occurred in the AC circuit.

As a case of detecting leakage current at the time of leakage current, a state of normal leakage and a state of lightning surge can be considered. Generally, leakage refers to leakage as follows, that is, the current value of the leakage current periodically appears. The lightning surge refers to the following leakage current, that is, the current value of the leakage current is relatively large, and the current value appears briefly.

In the case of normal leakage in the two types of leakage, since leakage is expected to occur for a long period of time, it is preferable to quickly block the supply of electric power via the AC circuit. On the other hand, in the case of a lightning surge, since leakage occurs only briefly, it is not preferable to block the supply of electric power via the AC circuit every time a lightning surge is generated.

As a conventional leakage resistor, a leakage resistor that can prevent unnecessary blocking caused by a lightning surge is known (for example, refer to Patent Document 1). The leakage resistor is distinguished from the ground fault current and the leakage caused by a lightning surge or a heavy ground fault (especially a leakage current with a relatively large current value of the leakage current in the normal leakage) by the second comparator. The current, the threshold of the second comparator is greater than the threshold of the first comparator that detects the leakage current. Moreover, in the period of the time gate made by the monostable multivibrator, a three-wave counter is used to detect whether three or more waves have been used from the first comparator. Pulse is output to the thunder The electrical glitch is distinguished from the heavy ground fault, and the monostable multivibrator is activated by the output of the second comparator. Thereby, the self-blocking signal output circuit outputs a blocking signal only in the case of a normal leakage including a heavy ground fault.

However, in the leakage resistor shown in Patent Document 1, in order to distinguish between a lightning surge and a normal leakage, it is necessary to count the leakage current having a relatively large current value three times depending on the situation. In other words, in the AC circuit, a leakage current is generated according to the waveform of the AC power source, and when the leakage current on the positive side or the negative side is equal to or greater than a predetermined value, a pulse is generated, and the pulse is continuously counted three times, thereby determining For leakage. In this way, the leakage detection time of the method of determining the leakage current by counting the leakage current three times in the above manner becomes long. In particular, in the case of a heavy earth fault in a normal electric leakage, there is a possibility that a relatively large leakage current continuously flows. Therefore, it is preferable to determine whether it is a normal electric leakage or a lightning surge more quickly, from the viewpoint of human body protection or the like. .

However, the leakage resistor shown in Patent Document 1 blocks the leakage, but does not display the leakage according to the effective value or the like in accordance with the output voltage of the zero-phase converter. Therefore, managers and the like cannot understand how much leakage has occurred. Further, it is assumed that leakage current is displayed while blocking leakage, and it is preferable to reduce the cost by making it as simple as possible.

The present invention has been made in view of the above circumstances, and provides a leakage detecting device capable of quickly identifying a normal electric leakage and a lightning surge.

The present invention has been made in view of the above circumstances, and provides a leakage detecting device capable of displaying leakage while blocking leakage while using a simple and inexpensive configuration.

A leakage detecting device according to an embodiment of the present invention includes: a zero-phase current transformer having a through-current circuit; an integral calculation unit that integrates an output voltage of the zero-phase current transformer; and an integral value comparison unit that performs the integral operation When the calculation result of the part is larger than the predetermined range, the first signal is output; the waveform determination unit detects and counts the inflection point of the output voltage waveform of the zero-phase current transformer, and when the number of the inflection points reaches When the number is a predetermined number, the second signal is output; and the leakage detecting unit outputs the first signal by the integral value comparing unit, and outputs the second signal by the waveform determining unit. The leakage detection signal is outputted, and the leakage detection signal indicates that leakage has occurred in the AC circuit.

Preferably, the waveform determining unit starts detecting the inflection point from when the output voltage of the zero-phase current transformer is a positive voltage or a negative voltage.

Further, it is preferable that the integral calculation unit obtains an effective value of an output voltage of the zero-phase current transformer by using an integral calculation.

Further, the integral calculation unit may obtain an average value of the output voltage of the zero-phase current transformer by using an integral calculation.

The waveform determining unit may include a pulse generating unit that generates a pulse based on an output voltage waveform of the zero-phase current transformer, and a pulse counting unit that counts the number of pulses generated by the pulse generating unit. When the number of pulses reaches a predetermined number, the second signal is output.

Preferably, when the output voltage of the zero-phase current transformer is larger than a predetermined range, the pulse generating unit generates the pulse.

Further, when the output voltage of the zero-phase current transformer is greater than the predetermined range for a predetermined time or longer, the pulse generating unit may generate the pulse.

Further, preferably, after the pulse is started, when the output voltage of the zero-phase current transformer is less than a predetermined voltage, the pulse generating unit stops generating the pulse.

Further, the pulse generating unit may be configured to stop generating the pulse after a predetermined time has elapsed since the start of the generation of the pulse.

Further, the pulse generation unit may be configured to stop generating the second pulse from the generation of the first pulse until a predetermined time elapses.

Preferably, the pulse counting unit counts the number of rises of the pulse generated by the pulse generating unit, and when the number reaches a predetermined number, outputs the second signal.

The pulse counting unit may be configured to count when the pulse width of the pulse generated by the pulse generating unit is equal to or larger than a predetermined width, and output the second signal when the number reaches a predetermined number.

Further, the pulse counting unit may be configured to count the number of drops of the pulse generated by the pulse generating unit, and output the second signal when the number reaches a predetermined number.

Further, the first pulse generated by the pulse generating unit may be performed. When the counting is completed, the pulse counting unit stops counting the second pulse until a predetermined time elapses.

The waveform determining unit may include a count value changing unit that changes the count value counted by the pulse counting unit when the pulse output width of the pulse generated by the pulse generating unit is equal to or larger than a predetermined width.

Preferably, the pulse output width is a time width from an output start time point of the pulse generated by the pulse generating unit to an output end time point.

The pulse output width may be a time width from an output start time point of the first pulse generated by the pulse generating unit to an output start time point of the second pulse connected to the first pulse.

Further, the pulse output width may be a time width from an output end time point of the first pulse generated by the pulse generating unit to an output end time point of the second pulse connected to the first pulse.

Further, the pulse output width may be a time width from an output start time point of the first pulse generated by the pulse generation unit to an output end time point of the second pulse.

Further, the leakage detecting device may further include a pulse generation condition changing unit that changes the generation condition of the pulse of the pulse generation unit based on the count value counted by the pulse counting unit.

Preferably, the pulse generation condition changing unit changes at least one of a voltage threshold value and a pulse width threshold value, and the voltage threshold value is used to determine whether or not the pulse generation unit has generated a pulse. The pulse width threshold is used when determining whether to count pulses.

Further, the pulse generating unit may generate a pulse based on the output voltage of the positive side of the zero-phase current transformer, that is, a positive side pulse and a pulse based on the output voltage of the negative side of the zero-phase current transformer, that is, the negative side. The pulse counting unit counts the positive side pulse and the negative side pulse, and when the number of the positive side pulse and the number of the negative side pulse are a predetermined number or more, the second signal is given Output.

Further, the leakage detecting device may further include a signal input unit that inputs a signal output instruction signal for causing the integral value comparing unit to output the first signal or for making a waveform The determination unit outputs the second signal.

Preferably, the signal input unit inputs the signal output instruction signal from an external resistor.

Further, the leakage detecting device may further include: an integrating unit that integrates an output voltage of the zero-phase current transformer; and an operation result output unit that outputs the result of the calculation by the integrating unit, wherein the calculation result output unit and the calculation result output unit The leakage detecting unit is composed of a module.

Preferably, the leakage detecting unit uses the integral unit as the integral calculating unit.

Further, the integration unit may be configured to average the output voltage of the zero-phase current transformer for a longer period of time than the integral calculation unit, and calculate an average value, and then the average value. Make points.

Preferably, when the calculation result of the above integral part is greater than the determination When the range of the voltage threshold value used when the first signal is outputted by the integral value comparing unit is narrower than a predetermined range, the calculation result output unit outputs a warning signal.

Further, the calculation result output unit may be configured to change an output form when the warning signal is output based on a calculation result of the integration unit.

The leakage detecting device may further include a calculation result storage unit that stores information of a calculation result of the integration unit for a predetermined amount of time.

Further, preferably, the leakage detecting device further includes an external terminal portion for outputting information stored in the calculation result of the calculation result storage unit.

Further, the information output unit may further include information outputted in the calculation result storage unit to the memory medium.

In addition, the information transmitting unit may transmit the information stored in the calculation result storage unit to the external server (server).

A leakage detecting device according to another embodiment of the present invention includes: a zero-phase current transformer having a through-current circuit; a first integral calculating unit that integrates an output voltage of the zero-phase current transformer; and a leakage detecting unit based on the The operation result of the first integral calculation unit outputs a leakage detection signal indicating that leakage has occurred in the AC circuit, and the second integration calculation unit integrates the output voltage of the zero-phase converter; And the calculation result output unit is advanced based on the calculation result of the second integral calculation unit In the row output, the calculation result output unit and the leakage detecting unit are constituted by one module.

Preferably, the leakage detecting unit uses the second integral calculating unit as the first integral calculating unit.

Further, the second integral calculation unit may be configured to average the output voltage of the zero-phase current transformer for a longer period of time than the first integral calculation unit, and calculate an average value. This average is then integrated.

Preferably, the integral value comparing unit includes, when the calculation result of the first integral calculating unit is larger than a predetermined range, the integral value comparing unit outputs the first signal, and the calculation result of the second integral calculating unit is larger than When the range of the voltage threshold value used when the first signal is outputted by the integral value comparing unit is determined to be narrower than a predetermined range, the calculation result output unit outputs a warning signal.

Further, the calculation result output unit may be configured to change an output form when the warning signal is output based on a calculation result of the second integral calculation unit.

The leakage detecting device may further include a calculation result storage unit that stores information of a calculation result of the second integral calculation unit for a predetermined amount of time.

Further, preferably, the leakage detecting device further includes an external terminal portion for outputting information stored in the calculation result of the calculation result storage unit.

Moreover, it may further include an information output unit, and the information output unit will memorize The information of the calculation result of the calculation result storage unit is output to the memory medium.

Further, the information transmission unit may be configured to transmit information stored in the calculation result storage unit to the external server.

Further, the leakage detecting device may further include: an integral value comparing unit that outputs a first signal when the calculation result of the first integral calculating unit is larger than a predetermined range; and a waveform determining unit that detects the zero-phase current transformer The inflection point of the output voltage waveform is detected and counted, and when the number of the inflection points reaches a predetermined number, the second signal is output, and the first signal is output by the integral value comparing unit. When the second signal is output by the waveform determining unit, the leakage detecting unit outputs the leakage detecting signal.

Preferably, the waveform determining unit starts detecting the inflection point from when the output voltage of the zero-phase current converter is a positive voltage or a negative voltage.

Further, it is preferable that the first integral calculation unit obtains an effective value of an output voltage of the zero-phase current transformer by using an integral calculation.

Further, the first integral calculation unit may obtain an average value of the output voltage of the zero-phase current transformer using an integral calculation.

The waveform determining unit may include a pulse generating unit that generates a pulse based on an output voltage waveform of the zero-phase current transformer, and a pulse counting unit that counts the number of pulses generated by the pulse generating unit. When the number reaches a predetermined number, the second signal is output.

Ideally, when the output voltage of the above zero-phase converter is greater than the gauge When the range is fixed, the pulse generating unit generates the pulse.

Further, when the output voltage of the zero-phase current transformer is greater than the predetermined range for a predetermined time or longer, the pulse generating unit may generate the pulse.

Further, preferably, after the pulse is started, when the output voltage of the zero-phase current transformer is less than a predetermined voltage, the pulse generating unit stops generating the pulse.

Further, the pulse generating unit may be configured to stop generating the pulse after a predetermined time has elapsed since the start of the generation of the pulse.

Further, the pulse generation unit may be configured to stop generating the second pulse from the generation of the first pulse until a predetermined time elapses.

Preferably, the pulse counting unit counts the number of rises of the pulse generated by the pulse generating unit, and when the number reaches a predetermined number, outputs the second signal.

The pulse counting unit may be configured to count when the pulse width of the pulse generated by the pulse generating unit is equal to or larger than a predetermined width, and output the second signal when the number reaches a predetermined number.

Further, the pulse counting unit may be configured to count the number of drops of the pulse generated by the pulse generating unit, and output the second signal when the number reaches a predetermined number.

Further, the first pulse generated by the pulse generating unit may be counted until the predetermined time elapses, and the pulse counting unit stops counting the second pulse.

The waveform determining unit may include a count value changing unit that changes the count value counted by the pulse counting unit when the pulse output width of the pulse generated by the pulse generating unit is equal to or larger than a predetermined width.

Preferably, the pulse output width is a time width from an output start time point of the pulse generated by the pulse generating unit to an output end time point.

The pulse output width may be a time width from an output start time point of the first pulse generated by the pulse generating unit to an output start time point of the second pulse connected to the first pulse.

Further, the pulse output width may be a time width from an output end time point of the first pulse generated by the pulse generating unit to an output end time point of the second pulse connected to the first pulse.

Further, the pulse output width may be a time width from an output start time point of the first pulse generated by the pulse generation unit to an output end time point of the second pulse.

Further, the leakage detecting device may further include a pulse generation condition changing unit that changes the generation condition of the pulse of the pulse generation unit based on the count value counted by the pulse counting unit.

Preferably, the pulse generation condition changing unit changes at least one of a voltage threshold value and a pulse width threshold value, and the voltage threshold value is used when determining whether the pulse generation unit has generated a pulse. The pulse width threshold is used when determining whether to count pulses.

Further, the pulse generating unit may generate a pulse based on the output voltage of the positive side of the zero-phase current transformer, that is, a positive side pulse and a pulse based on the output voltage of the negative side of the zero-phase current transformer, that is, the negative side. The pulse counting unit counts the positive side pulse and the negative side pulse, and when the number of the positive side pulse and the number of the negative side pulse are a predetermined number or more, the second signal is given Output.

Further, the leakage detecting device may further include a signal input unit that inputs a signal output instruction signal for causing the integral value comparing unit to output the first signal or for making a waveform The determination unit outputs the second signal.

Preferably, the signal input unit inputs the signal output instruction signal from an external resistor.

According to the present invention, it is possible to quickly recognize the normal leakage and the lightning surge.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings which form a part of this specification. In the entire drawings, the same or similar components are denoted by the same reference numerals, and the description will be omitted.

(First embodiment)

1 is a block diagram showing a configuration example of a leakage detecting device according to a first embodiment of the present invention. The leakage detecting device 100 shown in FIG. 1 includes a zero-phase current transformer 10, an integral calculating unit 20, an integral value comparing unit 30, a waveform determining unit 40, and a leakage detecting unit 50.

The zero-phase current transformer 10 includes a ring-shaped core including a magnetic body such as a soft magnetic material that constitutes a plurality of primary conductors of an alternating current circuit, wherein the alternating current circuit has a three-phase current flowing; and is wound around the core Ring coil. When a difference occurs between the current flowing in the forward direction of the alternating current circuit and the current flowing in the return path, the zero-phase current transformer 10 generates a leakage current based on the difference. Moreover, an induced voltage corresponding to the leakage current is generated at both ends of the coil. The zero-phase current transformer 10 outputs the induced voltage as the output voltage of the zero-phase current transformer 10, that is, the ZCT output voltage, to the integral calculation unit 20 and the waveform determination unit 40. Further, although not shown, in order to obtain a voltage output from the zero-phase current transformer 10, a resistance element is inserted in parallel with the zero-phase current transformer 10.

The integral calculation unit 20 includes an integration circuit or the like, and integrates the ZCT output voltage, and outputs the accumulated voltage (accumulated voltage) as an output voltage to the integral value comparison unit 30.

Further, the integral calculation unit 20 may obtain an effective value of the ZCT output voltage using an integral calculation. For example, the square value of the ZCT output voltage of one cycle is integrated, and then divided by the time of one cycle to find the square root of the above value. In this case, the leakage current can be detected with higher accuracy, and the leakage detection performance for the distorted wave is improved. Further, the integral calculation unit 20 may obtain an average value of the ZCT output voltage using an integral calculation. For example, the absolute value of the ZCT output voltage of one cycle is integrated, and then divided by the time of one cycle, so that the average value of the absolute value is calculated. In the integral value comparing unit 30, the average value of the above absolute values is used for comparison. In this case, the calculation amount can be compared with the determination of the effective value. The reduction is made so that the leakage detecting device 100 can be constructed at low cost.

The integrated value comparison unit 30 includes a comparison circuit or the like, and when the calculation result of the integral calculation unit 20, that is, the absolute value of the integral value is equal to or greater than the integral value determination threshold value th1 as the predetermined value, the voltage H is output to the leakage detecting unit. 50 (refer to Figure 3). Here, the integral value determination threshold value th1 is a positive number. On the other hand, when the absolute value of the integrated value is less than the integral value determination threshold value th1, the voltage L is output to the leakage detecting unit 50. The output voltage of the integrated value comparing unit 30 is the voltage H, and the integrated value comparing unit 30 outputs a predetermined signal (first signal). Furthermore, the voltage H is higher than the voltage L.

The waveform discriminating unit 40 detects and counts the inflection point of the voltage waveform of the ZCT output voltage, and when the number of the inflection points reaches a predetermined number, outputs the voltage H to the leakage detecting unit 50. On the other hand, when the number of inflection points has not reached the prescribed number, the voltage L is output to the leakage detecting portion 50. The output voltage of the waveform discriminating unit 40 is the voltage H. This corresponds to the waveform determining unit 40 outputting a predetermined signal (second signal). Here, the predetermined number is, for example, "2", "3", or the like. The detailed configuration of the waveform discriminating unit 40 will be described later.

Further, the waveform discriminating unit 40 may detect the inflection point from whether the ZCT output voltage is a positive voltage or a negative voltage. Thereby, the inflection point can be detected at a high speed, and in the case of normal leakage, the AC circuit can be blocked at a higher speed.

The leakage detecting unit 50 includes an AND circuit or the like. When the output voltage of the integrated value comparing unit 30 is the voltage H and the output voltage of the waveform determining unit 40 is the voltage H, the voltage H is output. The output voltage of the leakage detecting unit 50 is The voltage H is equivalent to outputting a leakage detection signal indicating that leakage has occurred in the AC circuit. Furthermore, the leakage detection signal is sent as a blocking signal for opening the circuit contacts of the alternating current circuit (to block the alternating current circuit) to a trip coil for opening the circuit contacts. (not shown). As a result, the circuit contacts of the AC circuit are turned on.

Next, a detailed configuration of the waveform determination unit 40 will be described. FIG. 2 is a block diagram showing a detailed configuration example of the waveform determination unit 40. The waveform discriminating unit 40 shown in FIG. 2 includes a pulse generating unit 41 and a pulse counting unit 42.

The pulse generation unit 41 includes a pulse generation circuit or the like, and generates a pulse based on the ZCT output voltage. In the example of FIG. 3, a short-time voltage is output as a pulse with a predetermined voltage value (voltage H).

The pulse counting unit 42 includes a pulse counter or the like, and counts the number of pulses generated by the pulse generating unit 41. When the number of pulses reaches a predetermined number, the output voltage is set to a voltage H, and the second signal is set. Output it. On the other hand, when the number of pulses has not reached the predetermined number, the output voltage is set to the voltage L, and the above-described second signal is not output.

Next, the operation of the leakage detecting device 100 of the present embodiment will be described. FIG. 3 is a timing chart for explaining a first operation example of the leakage detecting device 100 of the present embodiment.

In the example of FIG. 3, when the absolute value of the ZCT output voltage is equal to or greater than the leakage current detection threshold value th2, the pulse generating portion 41 generates a pulse having a narrow width. Here, the leakage current detection threshold th2 is a positive number. Such The pulse generating operation of the pulse generating unit 41 corresponds to detecting the inflection point of the output voltage waveform. Thereby, the malfunction does not occur due to the lightning surge, the operation can be performed in the case of the desired leakage current value, and the leakage can be detected at a higher speed. On the other hand, when the absolute value of the ZCT output voltage is less than the leakage current detection threshold th2, no pulse is generated. Here, the counting is performed by the pulse counting unit 42 when the pulse rises.

The "leakage current" of FIG. 3 indicates the leakage current generated in the zero-phase current transformer 10 in each case (normally, a leakage current, a lightning surge). As shown in FIG. 3, in the case of normal leakage, a periodic leakage current is generated, and in the case of a lightning surge, a relatively large and short leakage current is generated.

The "ZCT output" of Fig. 3 indicates the output voltage (ZCT output voltage) of the zero-phase current transformer 10 corresponding to the leakage current in each case.

The "pulse generation unit output" of Fig. 3 indicates the output voltage of the pulse generation unit 41 in each case. In the example of Fig. 3, in the same period, in the case of normal leakage, three-wave pulses are generated, and in the case of lightning surges, two-wave pulses are generated, and in the case of leakage, more pulses are generated.

The "counter" of Fig. 3 indicates the count value held by the pulse counting unit 42 in each case.

The "counter output" of Fig. 3 indicates the output voltage of the pulse counting unit 42 in each case. In the example of FIG. 3, when the pulse of the third wave is generated, the output voltage of the pulse counting unit 42 becomes the voltage H.

The "integral operation output" of FIG. 3 indicates the output voltage of the integral calculation unit 20 in each case.

The "integral value comparison output" of FIG. 3 indicates the output voltage of the integral value comparing unit 30 in each case.

The "leakage detection signal output" of Fig. 3 indicates the output voltage of the leakage detecting unit 50 in each case.

According to the first operation example described above, it is possible to quickly recognize the normal electric leakage and the lightning surge.

FIG. 4 is a timing chart for explaining a second operation example of the leakage detecting device 100 of the embodiment.

In the example of FIG. 4, when the state in which the absolute value of the ZCT output voltage is equal to or greater than the leakage current detection threshold value th2 is equal to or longer than the predetermined time t1, the pulse generation unit 41 generates a pulse having a narrow width. On the other hand, when the absolute value of the ZCT output voltage is less than the leakage current detection threshold th2, or when the absolute value of the ZCT output voltage is greater than or equal to the leakage current detection threshold th2, the time is not exceeded. Generate a pulse.

As shown in FIG. 4, the voltage value of the ZCT output voltage and the continuation of the predetermined time are taken into consideration. Therefore, when compared with FIG. 3, the "pulse generation unit output" is delayed by a predetermined time (timing). And is output. In the present embodiment, the pulse counting unit 42 counts the pulses based on the rising edge of the pulse. Accordingly, the timings of the "counter", "counter output", and "leakage detection signal output" are also delayed. Thereby, the malfunction does not occur due to the lightning surge, the operation can be performed in the case of the desired leakage current value, and the leakage can be detected at a higher speed. Moreover, the tolerance to noise is also strong, and the robustness is improved.

In addition, in FIG. 4, the illustration of "integration calculation output", "integrated value comparison output", and "leakage detection signal output" is abbreviate|omitted.

FIG. 5 is a timing chart for explaining a third operation example of the leakage detecting device 100.

In the example of FIG. 5, it is assumed that after the pulse is started, when the absolute value of the ZCT output voltage is less than the pulse stop determination threshold value th3, the pulse generation portion 41 stops generating the pulse. On the other hand, when the absolute value of the ZCT output voltage is equal to or greater than the pulse stop determination threshold value th3, the pulse is continuously generated. Here, th2>th3>0.

Therefore, as shown in the "pulse generation unit output" of Fig. 5, the absolute value of the output voltage from the ZCT is greater than or equal to the leakage current detection threshold th2 until the absolute value of the ZCT output voltage is less than the pulse stop determination threshold th3. , produces a pulse. Here, when the pulse is lowered, the counting is performed by the pulse counting unit 42. Therefore, the timing of the "counter", "counter output", and "leakage detection signal output" is delayed when compared with the case where the pulse is counted up.

In addition, in FIG. 5, the illustration of "integration calculation output", "integral value comparison output", and "leakage detection signal output" is abbreviate|omitted.

Here, the case where the pulse stop time point is determined in consideration of the voltage is shown here, but the time may be considered in place of the voltage. For example, as shown in FIG. 6 to be described later, the pulse generation unit 41 may stop the pulse when a predetermined time (predetermined width) t2 has elapsed since the start of the pulse generation. If this is the case, the noise will not affect the leakage detection within the specified time after the pulse is started.

FIG. 6 is a timing chart for explaining a fourth operation example of the leakage detecting device 100 of the embodiment.

In the example of FIG. 6, after the pulse generation unit 41 generates a pulse having a predetermined width t2, the next pulse is not generated for a predetermined period of time. In other words, it is assumed that the pulse generation unit 41 stops generating the second pulse from the time when the first pulse is generated until a predetermined time elapses. In the example of Fig. 6, the above-described pulse output masking period is only applicable to the case of normal leakage.

In the example of FIG. 6, for the normal leakage, the generation timing of one pulse is included in the pulse output masking period which is a predetermined time. In this case, since the second pulse to be generated by the pulse generating portion 41 overlaps with the output masking period, it is generated after the end of the output masking period. Therefore, the count value of the pulse count is counted by one pulse delay.

Further, in the example shown by the lightning glitch of FIG. 6, it is assumed that the first pulse and the second pulse are generated by the pulse generating unit 41 in the absence of the output occlusion period, and the pulse counting unit 42 performs the pulse on the basis of the pulse falling edge. The counting is performed until the first pulse is counted until the predetermined time elapses, and the counting of the second pulse is stopped. In the example of Fig. 6, the above-described count shading period is only applicable to the case of a lightning surge.

In the example shown by the lightning glitch, the counting timing of one pulse is included in the counting occlusion period as the predetermined time. In this case, the second pulse to be counted by the pulse counting unit 42 is overlapped with the count mask period, and therefore is counted after the end of the count mask period. Therefore, the count value of the pulse count is counted by one pulse delay. Therefore, "counting The timing of the "timer" is delayed, so the timing of "counter output" and "leakage detection signal output" is also delayed.

In addition, in FIG. 6, the illustration of "integrated operation output", "integrated value comparison output", and "leakage detection signal output" is abbreviate|omitted.

Thus, by setting the pulse masking period or the counting masking period for a predetermined time, the pulse can be correctly generated or the pulse can be correctly counted. In particular, it is possible to prevent false detection of lightning surges, thereby preventing malfunction of the leakage detecting device 100. Further, in the present embodiment, the pulse output masking period includes the generation timing of one pulse, and the count masking period includes the counting timing of one pulse. Therefore, if the second pulse is counted, the pulse counting is performed. The output voltage of the portion 42 becomes the voltage H.

FIG. 7 is a timing chart for explaining a fifth operation example of the leakage detecting device 100 of the embodiment.

In the example of FIG. 7, the absolute value of the ZCT output voltage is greater than or equal to the leakage current detection threshold value th2 until the absolute value of the ZCT output voltage is less than the leakage current detection threshold value th2, and the pulse generating portion 41 generates a pulse. In addition, when the pulse width (time width) of the pulse generated by the pulse generating unit 41 is equal to or larger than the predetermined width A, the pulse counting unit 42 counts. On the other hand, when the pulse width of the pulse is less than the prescribed width A, the pulse is not counted.

Here, when the pulse is lowered, the counting is performed by the pulse counting unit 42. Therefore, the timing of the "counter", "counter output", and "leakage detection signal output" is delayed when compared with the case where the pulse is counted up.

In addition, in FIG. 7, the illustration of "integration calculation output", "integrated value comparison output", and "leakage detection signal output" is abbreviate|omitted. According to such an operation example, it is possible to easily distinguish between a lightning surge and a normal leakage and detect the lightning surge.

(Second embodiment)

As shown in FIG. 8, the leakage detecting device 100 according to the second embodiment includes a waveform determining unit 40B instead of the waveform determining unit 40 shown in the first embodiment. In the leakage detecting device 100 of the present embodiment, the same components as those of the leakage detecting device 100 of the first embodiment are denoted by the same reference numerals and will not be described.

FIG. 8 is a block diagram showing an example of the configuration of the waveform determining unit 40B in the second embodiment of the present invention. The waveform determining unit 40B shown in FIG. 8 includes a count value changing unit 43 in addition to the pulse generating unit 41 and the pulse counting unit 42.

The count value changing unit 43 includes a control circuit or the like, and detects a pulse output width of a pulse generated by the pulse generating unit 41. When the pulse output width is equal to or larger than a predetermined width or less than a predetermined width, the pulse counting unit 42 is used. The count value is changed. For example, when the pulse output width is equal to or greater than a predetermined width, the count value can be increased by 1, and when the pulse output width is less than a predetermined width, the count value can be decreased by one.

In the present embodiment, the pulse generation unit 41 generates a pulse in a section in which the absolute value of the ZCT output voltage is equal to or greater than the leakage current detection threshold value th2. Also, the pulses are counted based on the falling edges of the respective pulses. Here, the "pulse output width" means the following The width described (refer to FIG. 9 described later).

(A) Time width A1 from the output start time point (rise time point) of the pulse P1 as the first pulse to the output end time point (fall time point) (the threshold value T1 is used at this time)

(B) Time width A2 from the output start time point of the pulse P1 as the first pulse to the output start time point of the pulse P2 as the second pulse connected to the first pulse (the threshold value T2 is used at this time)

(C) Time width A3 from the output end time point of the pulse P1 to the output end time point of the pulse P2 (the threshold value T3 is used at this time)

(D) Time width A4 from the output start time point of the pulse P1 to the output end time point of the pulse P2 (the threshold value T4 is used at this time)

FIG. 9 is a timing chart for explaining an operation example of the leakage detecting device 100 of the present embodiment.

In the example of FIG. 9, when the pulse output width A3 is equal to or greater than the threshold value T3, the count value is increased by only one. Thereby, the timing for changing the count value can be flexibly set. Therefore, by setting any one of the time widths A1 to A4 to the pulse output width, the operation time of the leakage detecting device 100 is not delayed, and malfunction can be prevented.

In the example shown in FIG. 9, in the case of normal leakage, the pulse width A3 between the pulse P1 and the pulse P2 is greater than the threshold value T3, and therefore, at the time point of the falling edge of the pulse P2, the count value is from 2 Increasing to 3, at this point in time, the voltage H is generated by the pulse counting portion 42.

Furthermore, in Fig. 9, "integration operation output" and "integral value comparison" The illustration of "output" and "leakage detection signal output" is omitted.

(Third embodiment)

The leakage detecting device 100 according to the third embodiment includes a waveform determining unit 40C instead of the waveform determining unit 40 shown in the first embodiment. In the leakage detecting device 100 of the present embodiment, the same components as those of the leakage detecting device 100 of the first embodiment are denoted by the same reference numerals and will not be described.

FIG. 10 is a block diagram showing a configuration example of the waveform determining unit 40C in the third embodiment of the present invention. The waveform determination unit 40C shown in FIG. 10 includes a pulse generation condition changing unit 44 in addition to the pulse generation unit 41 and the pulse counting unit 42.

The pulse generation condition changing unit 44 includes a control circuit or the like, and changes the pulse generation condition of the pulse generation unit 41 and/or the pulse count condition of the pulse count unit 42 based on the count value counted by the pulse count unit 42. The voltage threshold value is used as a pulse generation condition, and a pulse width (time width) threshold value or the like is present as a pulse count condition, and the voltage threshold value is used when determining whether or not the pulse generation unit 41 has generated a pulse. The pulse generation condition changing unit 44 sets the voltage threshold (for example, "leakage current detection threshold value th2" described in the first embodiment) and the pulse width threshold (for example, as described in the first embodiment). At least one of the "predetermined width A") is changed.

FIG. 11 is a timing chart for explaining an operation example of the leakage detecting device 100 of the present embodiment.

In the example of FIG. 11, when the pulse width is longer than A, according to the pulse The first pulse and the second pulse are counted by the falling edge of the rush, and the pulse generation condition changing unit 44 sets the time threshold at the time of the pulse generation determination of the pulse counting unit 42 when the output of the counter is "2". change. In other words, the time threshold for the pulse generation unit 41 is changed to the instantaneous detection at the time of counting twice. That is, counting is performed based on the rising edge of the pulse. Thereby, malfunction of the leakage detecting device 100 caused by a lightning surge or the like can be prevented, and in the case of normal leakage, the AC circuit can be blocked at a higher speed.

In addition, in FIG. 11, the illustration of "integration calculation output", "integrated value comparison output", and "leakage detection signal output" is abbreviate|omitted.

(Fourth embodiment)

The leakage detecting device 100 of the fourth embodiment includes a waveform determining unit 40D instead of the waveform determining unit 40 shown in the first embodiment. In the leakage detecting device 100 of the present embodiment, the same components as those of the leakage detecting device 100 of the first embodiment are denoted by the same reference numerals and will not be described.

FIG. 12 is a block diagram showing an example of the configuration of the waveform determining unit 40D in the fourth embodiment of the present invention. The waveform discriminating unit 40D shown in FIG. 12 includes a positive side pulse generating unit 41A, a negative side pulse generating unit 41B, a positive side pulse counting unit 42A, and a negative side pulse counting unit 42B.

The positive side pulse generating portion 41A generates a pulse based on the positive side ZCT output voltage, that is, a positive side pulse. The negative side pulse generating portion 41B generates a pulse based on the negative side ZCT output voltage, that is, a negative side pulse. Furthermore, the condition when the positive side pulse or the negative side pulse is generated by the ZCT output voltage is as explained above. The conditions are the same.

The positive side pulse counting unit 42A counts the positive side pulse, and when the number of counts is equal to or greater than a predetermined number, sets the output voltage to the voltage H and outputs the second signal. The negative side pulse counting unit 42B counts the negative side pulse, and when the number of counts is equal to or greater than a predetermined number, the output voltage is set to the voltage H, and the second signal is output. Therefore, when at least one of the number of positive side pulses and the number of negative side pulses is a predetermined number or more, the second signal is output. Furthermore, the conditions for counting the positive side pulse or the negative side pulse are the same as those previously described.

FIG. 13 is a timing chart for explaining an operation example of the leakage detecting device 100 of the present embodiment.

The "positive side pulse generating portion output" of Fig. 13 indicates the output voltage of the positive side pulse generating portion 41A in each case. In the example of Fig. 13, two waves of positive side pulses are generated in the case of normal leakage in the same period, and one wave of positive side pulses are generated in the case of lightning surges, and more pulses are generally generated in the case of electric leakage.

The "positive side counter" of Fig. 13 indicates the count value held by the positive side pulse counting unit 42A in each case.

The "negative side pulse generation unit output" of Fig. 13 indicates the output voltage of the negative side pulse generation portion 41B in each case. In the example of Fig. 13, one wave of the negative side pulse is generated in the case of the normal leakage in the same period, and one wave of the negative side pulse is also generated in the case of the lightning surge.

The "negative side counter" of Fig. 13 indicates the count value held by the negative side pulse counting unit 42B in each case.

The "counter output" of Fig. 13 indicates that the outputs of the positive side counter and the negative side counter are considered. In the example of FIG. 13, when at least one of the positive side pulse counting unit 42A and the negative side pulse counting unit 42B counts at least one of the positive side pulse and the negative side pulse to reach two or more pulses, the counter outputs The output voltage becomes the voltage H. Therefore, in the example of FIG. 13, the counter output becomes the voltage H only in the case of normal leakage. Further, although not shown, the outputs of the positive side pulse counting unit 42A and the negative side pulse counting unit 42B are output to the leakage output unit 50 via the OR gate.

In addition, in FIG. 13, the illustration of "integrated operation output", "integrated value comparison output", and "leakage detection signal output" is abbreviate|omitted.

In this manner, the positive side and the negative side of the ZCT output voltage are distinguished to generate a pulse and the pulse is counted, whereby the half-wave leakage can be easily detected.

(Fifth Embodiment)

FIG. 14 is a block diagram showing a configuration example of the leakage detecting device 100E in the fifth embodiment of the present invention. The leakage detecting device 100E includes a zero-phase current transformer 10, an integral computing unit 20, an integral value comparing unit 30, a waveform determining unit 40, a leakage detecting unit 50E, and a plurality of logical computing units as integrated circuits. Here, the case where the first logical operation unit 60 and the second logical operation unit 70 are included as the plurality of logical circuit units is exemplified, but the present invention is not limited thereto. Further, instead of the waveform determination unit 40, the waveform determination unit 40B to the waveform determination unit 40D described above may be used. The same components as those of the leakage detecting device 100 according to the first embodiment to the fourth embodiment are denoted by the same reference numerals and will not be described.

The first logic operation unit 60 and the second logic operation unit 70 have a function as a signal input unit that inputs a signal output instruction signal for causing the output voltage of the integrated value comparison unit 30 to be changed. The voltage H (that is, the first signal is output) and the output voltage of the waveform determining unit 40 are changed to a voltage H (that is, the second signal is output). Therefore, the plurality of algorithms described in the first to fourth embodiments can be changed by the above-described circuit unit. In other words, the first logic unit 60 and the second logic unit 70 output the first signal and the second signal to the leakage detection independently of the outputs of the integral value comparing unit 30 and the waveform determining unit 40, based on signals from the outside. Measuring unit 50E.

The first logic operation unit 60 includes an OR circuit or the like, and outputs voltage H when at least one of the output voltage of the integrated value comparison unit 30 and the output voltage of the external circuit unit is the voltage H.

The second logic operation unit 70 includes an OR circuit or the like, and outputs voltage H when at least one of the output voltage of the waveform determination unit 40 and the output voltage of the external circuit unit is the voltage H.

Further, as the external circuit portion of the first logic operation unit 60 and the second logic operation unit 70, a low-capacity chip resistor can be considered. The chip resistor is connected to the input pins of the first logic operation unit 60 and the second logic operation unit 70. Thereby, the circuit can be configured inexpensively including the external circuit portion. In this way, the signal output indication signal can also be input from an external resistor.

The leakage detecting unit 50E includes an AND circuit or the like, and the output voltage of the first logical operation unit 60 is the voltage H and the output of the second logical operation unit 70. When the voltage is the voltage H, the voltage H is output. The output voltage of the leakage detecting unit 50E is a voltage H, which is equivalent to outputting a leakage detecting signal indicating that leakage has occurred in the AC circuit. Furthermore, the leakage detection signal is sent to a tripping coil for opening the circuit contacts of the AC circuit (to block the AC circuit) (not shown) ). As a result, the circuit contacts of the AC circuit are turned on.

According to the leakage detecting device 100E of the present embodiment, the output voltage of the external circuit unit connected to the first logic calculating unit 60 is set to the voltage H, which is equivalent to the first embodiment to the fourth embodiment. The output voltage of the form integral value comparing unit 30 is always the voltage H, and therefore the function of the integral value comparing unit 30 can be disabled. In the same manner, the output voltage of the external circuit unit connected to the second logic unit 70 is set to the voltage H, which is equivalent to the waveform determination unit 40 of the first embodiment to the fourth embodiment (40, 40B~). The output voltage of any one of 40D is always the voltage H, and therefore, the function of the waveform discriminating section 40 or the like can be disabled. That is, an external circuit portion can be used to disable a single function.

Here, the following description has been made. In this case, the first logic operation unit 60 and the second logic operation unit 70 are used to disable a part of the function of the leakage detecting device 100E. Circuit department. For example, a configuration may be adopted in which a change signal is input from an external device (not shown) for at least one of the integral calculation unit 20, the integral value comparison unit 30, or the waveform determination unit 40. The thresholds such as voltage thresholds or time thresholds are changed, or The count value is changed. For example, when the threshold value is changed, the measurement voltage or the measurement time may be changed to a value that always exceeds the threshold value. Further, for example, the count value may be changed to a value that always exceeds the count threshold. With the configuration as described above, a part of the function of the leakage detecting device 100E can also be disabled.

(Sixth embodiment)

FIG. 15 is a block diagram showing a configuration example of the leakage detecting device 100F according to the sixth embodiment of the present invention. The leakage detecting device 100F of the present embodiment includes a zero-phase current transformer 10, and a first system (level of leakage detecting unit 80) having zero phase as explained in the first embodiment to the fifth embodiment. The functions of the leakage detecting devices 100 and 100E other than the converter 10; and the second system integrate the output voltage (ZCT output voltage) of the zero-phase converter 10, and output according to the integration result. That is, the first system realizes the function of the leakage resistance, and the second system realizes the function of notifying the user (user) of the leakage amount (leakage current value).

The leakage level detecting unit 80 as the first system includes the integral calculating unit 20, the integral value comparing unit 30, the waveform determining unit 40, the leakage detecting unit 50, and the like as described above. The leakage level detecting unit 80 includes at least the integral calculating unit 20 and the leakage detecting unit 50. When the leakage level detecting unit 80 includes only the integral calculating unit 20 and the leak detecting unit 50, the leak detecting unit 50 outputs a leak detecting signal based on the calculation result of the integral calculating unit 20.

The second system includes an integration unit 91 and an operation result output unit 92. The integration unit 91 integrates the ZCT output voltage and has the same configuration as the integral calculation unit 20 described above. The operation result output unit 92 is based on The calculation result (integral value) of the integration unit 91 is output. The calculation result output unit 92 outputs various kinds of information by, for example, a display (not shown) or a speaker. Here, for example, the effective value (the effective value calculation result) of the ZCT output voltage obtained by the integration operation described above or the average value (the average value calculation result) of the ZCT output voltage obtained by the integral operation is output as an operation result. .

Here, each component of the first system and the second system is formed in one integrated circuit (one module). Therefore, in the above manner, the leakage detecting device 100F is configured by the same package, whereby the cost can be reduced. That is, it is possible to display the leakage while blocking the leakage by using a simple and inexpensive configuration.

Further, as shown in FIG. 16, the integration unit 91 may be used as the integral calculation unit 20 described in the first embodiment. In other words, the leakage level detecting unit 80 does not include the integral calculating unit 20, and the integral value comparing unit 30 inputs the output of the integrating unit 91. In this way, the components for performing integration are shared, whereby the cost can be reduced. Further, hardware such as an integrating circuit is shared, whereby the difference caused by the hardware or the calculation method for the integral operation is not affected, and therefore, the level detection value for the leakage detection, There is no error in the display value for indicating the degree of leakage, and therefore it is possible to adjust without causing a contradiction between the two.

Further, the calculation result output unit 92 may output a value (average value) obtained by averaging the integral values calculated by the integration unit 91. Further, the integral value comparing unit 30 may also obtain a value (average value) obtained by averaging the integral values calculated by the integral calculating unit 20 and a predetermined value (integral value judgment threshold) Th1) for comparison. The average value is, for example, the average time. In this case, it is preferable that the period when the calculation result is output by the calculation result output unit 92 is longer than the period when the integration value comparison unit 30 performs averaging. Further, the integration unit 91 can average the ZCT output voltage over a longer period of time than the integral calculation unit 20, calculate an average value of the ZCT output voltage, and then integrate the average value to obtain an integral value. Thereby, the integral value (corresponding to the leakage current value) or the like can be accurately output without being affected by the fluctuation of the ZCT output voltage caused by noise such as a surge voltage.

Furthermore, the average value will be described here, but an effective value may be used instead of the average value.

In addition, when the absolute value of the calculation result (integral value) of the integration unit 91 is larger than the threshold value th4 (th2>th4>0), the calculation result output unit 92 outputs a warning signal (alarm). The threshold value th4 (th2>th4>0) is smaller than the leakage current detection threshold value th2 for the leakage detection in the leakage level detecting unit 80. The warning signal here can be considered to use a warning using sound information or a warning to display information. In other words, the warning signal may be output when the calculation result of the integration unit 91 is greater than the threshold value th2, and the threshold value th2 is used when determining whether the integrated value comparison unit 30 has output the first signal. Thereby, the user can know the state of the leakage in advance before detecting the leakage of the degree to block the AC circuit.

Further, the calculation result output unit 92 can change the output form in which the warning signal is output based on the calculation result of the integration unit 91. In this case, For example, when the absolute value of the calculation result of the integration unit 91 exceeds 50% of the absolute value of the leakage current detection threshold value th2, the light-emitting diode (LED) is turned on, and the operation of the integration unit 91 is performed. When the absolute value of the result exceeds 80% of the absolute value of the leakage current detection threshold th2, an alarm sound is output. Thereby, it is possible to accurately report the degree of urgency (level) until the leakage resistance is broken, and it is possible to avoid a situation in which the leakage resistance is suddenly broken.

Further, as shown in FIG. 17, the leakage detecting device 100F may further include a calculation result storage unit 93 that memorizes the calculation result of the integration unit 91. The calculation result storage unit 93 stores, for example, information of a calculation result of a predetermined amount of time (one week or the like). At this time, the information may be overwritten after being overwritten for a predetermined period of time. In addition, the information of the calculation result refers to the integral value (effective value, average value) of the ZCT output voltage. As a result, since the calculation result of the fixed time until the leakage resistance is broken, it is easy to determine the cause of the blocking.

Further, as shown in FIG. 18, the leakage detecting device 100F may include an external terminal portion 94 for calculating the calculation result of the integrating portion 91 or the calculation result of the calculation result storage portion 93 via the external terminal. The information is output. The external terminal portion 94 is, for example, a universal serial bus (USB) terminal or the like. Since the external terminal portion 94 is included, the information of the calculation result can be easily output, and the cause of the blocking can be easily determined.

Further, as shown in FIG. 19, the leakage detecting device 100F may further include an information output unit 95 for calculating the calculation result of the integrating unit 91. The information of the calculation result of the operation result storage unit 93 is output to the memory medium. The memory medium is, for example, a USB memory or a Secure Digital (SD) card. Thereby, for example, since the calculation result of the fixed time until the leakage resistance is broken is output to the memory medium, the data is easy to carry, and it is easy to determine the cause of the blocking.

Further, as shown in FIG. 20, the leakage detecting device 100F may further include an information transmitting unit 96 that transmits information of the calculation result of the integrating unit 91 or information of the calculation result of the calculation result storage unit 93 to the external servo. Device. As a result, for example, since the calculation result of the fixed time until the leakage resistance is broken is output to the external server, the remote control center or the like can easily grasp the leakage condition and easily determine the cause of the blocking.

All of the above embodiments and the examples and modifications of the embodiments can be used in combination with each other. The preferred embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above, and various changes and modifications may be made without departing from the scope of the inventions. Within the scope of the.

10‧‧‧Zero-phase converter (ZCT)

20‧‧‧Integral Computing Department

30‧‧‧Integral value comparison department

40, 40B, 40C, 40D‧‧‧ waveform discriminating department

41‧‧‧ Pulse Generation Department

41A‧‧‧ Positive Side Pulse Generation Department

41B‧‧‧Negative side pulse generation unit

42‧‧‧pulse counting section

42A‧‧‧positive side pulse counting unit

42B‧‧‧negative side pulse counting unit

43‧‧‧Count value change department

44‧‧‧Pulse generation condition change department

50, 50E‧‧‧Leakage Detection Department

60‧‧‧1st logical operation department

70‧‧‧2nd logical operation department

80‧‧‧Leakage Level Detection Department

91‧‧ ‧ points department

92‧‧‧Operation result output

93‧‧‧Computation Results Memory

94‧‧‧External terminal

95‧‧‧Information Export Department

96‧‧‧Information Transmission Department

100, 100E, 100F‧‧‧ leakage detection device

H, L‧‧‧ voltage

T1‧‧‧specified time

T2‧‧‧specified time (specified width)

Th1‧‧‧ integral value judgment threshold

Th2‧‧‧ leakage current detection threshold

Th3‧‧‧pulse stop determination threshold

T1~T4‧‧‧ threshold

A‧‧‧specified width

A3‧‧‧ time width

P1, P2‧‧‧ pulse

The objects and features of the present invention will become apparent from the following description of the preferred embodiments.

1 is a circuit block diagram showing a configuration example of a leakage detecting device according to a first embodiment of the present invention.

FIG. 2 is a circuit block diagram showing a detailed configuration example of the waveform determination unit in the first embodiment of the present invention.

Fig. 3 is a view showing the leakage detecting device in the first embodiment of the present invention; A timing chart for explaining the first operation example.

FIG. 4 is a timing chart for explaining a second operation example of the leakage detecting device according to the first embodiment of the present invention.

FIG. 5 is a timing chart for explaining a third operation example of the leakage detecting device according to the first embodiment of the present invention.

FIG. 6 is a timing chart for explaining a fourth operation example of the leakage detecting device according to the first embodiment of the present invention.

FIG. 7 is a timing chart for explaining a fifth operation example of the leakage detecting device according to the first embodiment of the present invention.

FIG. 8 is a circuit block diagram showing a detailed configuration example of the waveform determination unit in the second embodiment of the present invention.

FIG. 9 is a timing chart for explaining an operation example of the leakage detecting device according to the second embodiment of the present invention.

FIG. 10 is a circuit block diagram showing a detailed configuration example of a waveform determination unit in the third embodiment of the present invention.

FIG. 11 is a timing chart for explaining an operation example of the leakage detecting device according to the third embodiment of the present invention.

FIG. 12 is a circuit block diagram showing a detailed configuration example of a waveform determination unit in the fourth embodiment of the present invention.

FIG. 13 is a timing chart for explaining an operation example of the leakage detecting device in the fourth embodiment of the present invention.

FIG. 14 is a circuit block diagram showing a configuration example of a leakage detecting device according to a fifth embodiment of the present invention.

Figure 15 is a view showing a leakage detecting device according to a sixth embodiment of the present invention; A block diagram of the first configuration example.

FIG. 16 is a block diagram showing a second configuration example of the leakage detecting device according to the sixth embodiment of the present invention.

FIG. 17 is a block diagram showing a third configuration example of the leakage detecting device according to the sixth embodiment of the present invention.

FIG. 18 is a block diagram showing a fourth configuration example of the leakage detecting device according to the sixth embodiment of the present invention.

FIG. 19 is a block diagram showing a fifth configuration example of the leakage detecting device according to the sixth embodiment of the present invention.

FIG. 20 is a block diagram showing a sixth configuration example of the leakage detecting device according to the sixth embodiment of the present invention.

10‧‧‧Zero-phase converter (ZCT)

20‧‧‧Integral Computing Department

30‧‧‧Integral value comparison department

40‧‧‧ Waveform Identification Department

50‧‧‧Leakage Detection Department

100‧‧‧Leakage detection device

Claims (61)

A leakage detecting device includes: a zero-phase current transformer having a through-current circuit; an integral calculation unit that integrates an output voltage of the zero-phase current transformer; and an integral value comparison unit that is larger than an operation result of the integral operation unit In the predetermined range, the first signal is output; the waveform determining unit detects and counts the inflection point of the output voltage waveform of the zero-phase current transformer, and when the number of the inflection points reaches a predetermined number, The second signal is output; and the leakage detecting unit outputs the first signal by the integral value comparing unit, and outputs the second signal by the waveform determining unit, thereby detecting the leakage The signal is outputted, and the leakage detection signal indicates that leakage has occurred in the AC circuit, wherein the integral calculation unit obtains an effective value of an output voltage of the zero-phase current transformer by using an integral calculation, or the integral calculation unit uses an integral The calculation calculates the average value of the output voltage of the zero-phase current transformer. The leakage detecting device according to claim 1, wherein the waveform determining unit starts detecting the inflection point from when the output voltage of the zero-phase current transformer is a positive voltage or a negative voltage. The leakage detecting device according to claim 1, wherein the waveform determining unit includes: a pulse generating unit that generates a pulse based on an output voltage waveform of the zero-phase current transformer; The pulse counting unit counts the number of pulses generated by the pulse generating unit, and outputs the second signal when the number of the pulses reaches a predetermined number. The leakage detecting device according to claim 3, wherein the pulse generating unit generates the pulse when the output voltage of the zero-phase current transformer is greater than a leakage current detecting threshold. The leakage detecting device according to claim 4, wherein the pulse generating unit generates the pulse when the output voltage of the zero-phase current transformer is greater than the leakage current detecting threshold for a preset time or longer. . The leakage detecting device according to any one of claims 3 to 5, wherein, after the pulse is started to be generated, when the output voltage of the zero-phase current transformer is less than a pulse stop determination threshold, The pulse generating unit stops generating the above pulse. The leakage detecting device according to any one of claims 3 to 5, wherein the pulse generating portion stops generating the pulse after a predetermined time elapses from the start of the generation of the pulse. The leakage detecting device according to any one of claims 3 to 5, wherein the pulse generating unit stops generating the second pulse from the generation of the first pulse until a predetermined time elapses. Leakage as described in any one of claims 3 to 5 In the electrical detection device, the pulse counting unit counts the number of rises of the pulse generated by the pulse generating unit, and when the number reaches a predetermined number, outputs the second signal. The leakage detecting device according to any one of claims 3 to 5, wherein the pulse counting unit counts when a pulse width of the pulse generated by the pulse generating unit is equal to or larger than a predetermined width. When the above number reaches a predetermined number, the second signal is output. The leakage detecting device according to any one of claims 3 to 5, wherein the pulse counting unit counts the number of drops of the pulse generated by the pulse generating unit, and when the number reaches the prescribed value In the case of the number, the second signal is output. The leakage detecting device according to any one of claims 3 to 5, wherein the pulse counting unit counts the count value of the pulse count by one pulse delay. The leakage detecting device according to any one of claims 3 to 5, wherein the waveform determining unit includes a count value changing unit, and a pulse output width of the pulse generated by the pulse generating unit is When the predetermined width is equal to or greater than the predetermined width, the count value changing unit changes the count value counted by the pulse counting unit. The leakage detecting device according to claim 13, wherein the pulse output width is a time width from an output start time point to an output end time point of the pulse generated by the pulse generating unit. The leakage detecting device according to claim 13, wherein the pulse output width is an output from a start time of an output of the first pulse generated by the pulse generating unit to a second pulse connected to the first pulse The time width from the start time point. The leakage detecting device according to claim 13, wherein the pulse output width is an output end time of the first pulse generated from the pulse generating unit to an output of the second pulse connected to the first pulse The time width until the end of the time. The leakage detecting device according to claim 13, wherein the pulse output width is a time width from an output start time point of the first pulse generated by the pulse generating unit to an output end time point of the second pulse . The leakage detecting device according to any one of claims 3 to 5, further comprising a pulse generation condition changing unit that is smaller than the predetermined number based on the pulse counting unit Count value, will be on The generation condition of the above-described pulse of the pulse generation unit is changed. The leakage detecting device according to claim 18, wherein the pulse generation condition changing unit changes at least one of a voltage threshold value and a pulse width threshold value, wherein the voltage threshold value is It is determined whether or not the pulse generation unit has generated the pulse, and the pulse width threshold is used when determining whether or not to count the pulse. The leakage detecting device according to any one of claims 3 to 5, wherein the pulse generating portion generates a pulse based on an output voltage of a positive side of the zero-phase current transformer, that is, a positive side pulse, And the pulse counting unit counts the positive side pulse and the negative side pulse with a pulse based on an output voltage of a negative side of the zero-phase current transformer, that is, a negative side pulse, and the number of the positive side pulse and the negative side When at least one of the number of pulses is a predetermined number or more, the second signal is output. The leakage detecting device according to any one of claims 3 to 5, further comprising a signal input unit that inputs a signal output indication signal, wherein the signal output indication signal is used to make the The integral value comparing unit outputs the first signal or causes the waveform determining unit to output the second signal. The leakage detecting device described in claim 21, wherein The signal input unit inputs the signal output instruction signal from an external resistor. The leakage detecting device according to claim 1, further comprising: an integrating unit that integrates an output voltage of the zero-phase current transformer; and an operation result output unit that outputs the result of the calculation by the integrating unit The calculation result output unit and the leakage detecting unit are configured by one module. A leakage detecting device includes: a zero-phase current transformer having a through-current circuit; an integral calculation unit that integrates an output voltage of the zero-phase current transformer; and an integral value comparison unit that is larger than an operation result of the integral operation unit In the predetermined range, the first signal is output; the waveform determining unit detects and counts the inflection point of the output voltage waveform of the zero-phase current transformer, and when the number of the inflection points reaches a predetermined number, The second signal is output; the leakage detecting unit outputs the first signal by the integral value comparing unit, and outputs the second signal by the waveform determining unit, thereby detecting the leakage detecting signal Outputting, the leakage detection signal indicating that leakage has occurred in the AC circuit; and the calculation result output unit is performed based on the calculation result of the integration unit Outputting, the calculation result output unit and the leakage detecting unit are configured by one module, wherein the integral calculation unit obtains an effective value of an output voltage of the zero-phase current transformer by using an integral calculation, or the integral calculation unit uses The integral operation calculates the average value of the output voltage of the zero-phase current transformer. The leakage detecting device according to claim 24, wherein the integrating unit averages an output voltage of the zero-phase current transformer for a longer period of time, and calculates an average value, in comparison with the integral calculating unit. Then, the average is integrated. The leakage detecting device according to claim 24, wherein the calculation result of the integrating unit is larger than a voltage threshold used when determining whether or not the first signal is output by the integral value comparing unit. When the range of the value is narrower than the predetermined range, the calculation result output unit outputs a warning signal. The leakage detecting device according to claim 26, wherein the calculation result output unit changes an output form when the warning signal is output based on a calculation result of the integration unit. The leakage detecting device according to claim 24, further comprising an operation result memory unit, wherein the operation result memory portion memorizes the preset time amount The information of the calculation result of the above-mentioned integral part. The leakage detecting device according to claim 28, further comprising an external terminal portion for outputting information of a calculation result stored in the calculation result storage unit. The leakage detecting device according to claim 28, further comprising an information output unit that outputs information stored in the calculation result of the calculation result storage unit to the memory medium. The leakage detecting device according to claim 28, further comprising an information transmitting unit that transmits information stored in the calculation result of the calculation result storage unit to the external server. A leakage detecting device includes: a zero-phase current transformer having a through-current circuit; a first integral computing unit that integrates an output voltage of the zero-phase current transformer; and a leakage detecting unit based on the first integral computing unit As a result of the calculation, the leakage detection signal is output, the leakage detection signal indicates that leakage has occurred in the AC circuit, and the second integral calculation unit integrates the output voltage of the zero-phase converter; and the calculation result output unit And outputting according to the calculation result of the second integral calculation unit, wherein the calculation result output unit and the leakage detection unit are In a module configuration, the second integral calculation unit averages an output voltage of the zero-phase current transformer in a longer period of time than the first integral calculation unit, calculates an average value, and then averages the average value. The integration is performed, and the first integral calculation unit obtains an effective value of an output voltage of the zero-phase current transformer by using an integral calculation, or the first integral calculation unit obtains an output of the zero-phase current transformer by using an integral calculation. The average value of the voltage. The leakage detecting device according to claim 32, further comprising a calculation result storage unit that stores information of a calculation result of the second integral calculation unit for a predetermined amount of time. The leakage detecting device according to claim 33, further comprising an external terminal portion for outputting information stored in the calculation result of the calculation result storage unit. The leakage detecting device according to claim 33, further comprising an information output unit that outputs information stored in the calculation result of the calculation result storage unit to the memory medium. The leakage detecting device according to claim 33, further comprising an information transmitting unit that transmits information stored in the calculation result of the calculation result storage unit to the external server. The leakage detecting device according to claim 32, further comprising an integral value comparing unit, wherein when the calculation result of the first integral calculating unit is larger than a predetermined range, the integral value comparing unit outputs the first signal. When the calculation result of the second integral calculation unit is larger than a predetermined range in which the range of the voltage threshold value used when the first signal is output by the integral value comparison unit is narrower, the calculation result output unit The warning signal is output. The leakage detecting device according to claim 37, wherein the calculation result output unit changes an output form when the warning signal is output based on a calculation result of the second integral calculation unit. The leakage detecting device according to claim 32, further comprising: an integral value comparing unit that outputs a first signal when the calculation result of the first integral calculating unit is larger than a predetermined range; and a waveform determining unit Detecting and counting the inflection point of the output voltage waveform of the zero-phase current transformer, and when the number of the inflection points reaches a predetermined number, outputting the second signal, by using the integral value comparison unit When the first signal is output and the second signal is output by the waveform determining unit, the leakage detecting unit outputs the leakage detecting signal. The leakage detecting device described in claim 39, wherein The waveform determining unit starts detecting the inflection point from when the output voltage of the zero-phase current converter is a positive voltage or a negative voltage. The leakage detecting device according to claim 39, wherein the waveform determining unit includes: a pulse generating unit that generates a pulse based on an output voltage waveform of the zero-phase current transformer; and a pulse counting unit that generates the pulse The number of pulses generated by the portion is counted, and when the number of pulses reaches a predetermined number, the second signal is output. The leakage detecting device according to claim 41, wherein the pulse generating portion generates the pulse when the output voltage of the zero-phase current transformer is greater than a leakage current detecting threshold. The leakage detecting device of claim 42, wherein the pulse generating unit generates the pulse when the output voltage of the zero-phase current transformer is greater than the leakage current detecting threshold for a preset time or longer. . The leakage detecting device according to any one of claims 41 to 43, wherein, after the generating of the pulse, when the output voltage of the zero-phase converter is less than a pulse stop determination threshold, The pulse generating unit stops generating the pulse. The leakage detecting device according to any one of claims 41 to 43 wherein the pulse generating portion stops generating the pulse after a predetermined time elapses from the start of the generation of the pulse. The leakage detecting device according to any one of claims 41 to 43 wherein the pulse generating unit stops generating the second pulse from the generation of the first pulse until a predetermined time elapses. The leakage detecting device according to any one of claims 41 to 43 wherein the pulse counting unit counts the number of rises of the pulse generated by the pulse generating unit, and when the number reaches the prescribed value In the case of the number, the second signal is output. The leakage detecting device according to any one of claims 41 to 43 wherein the pulse counting unit counts when the pulse width of the pulse generated by the pulse generating unit is equal to or larger than a predetermined width. When the above number reaches a predetermined number, the second signal is output. The leakage detecting device according to any one of claims 41 to 43 wherein the pulse counting unit counts the number of drops of the pulse generated by the pulse generating unit, and when the number reaches the prescribed value In the case of the number, the second signal is output. As described in any one of claims 41 to 43 of the patent application scope The leakage detecting device wherein the pulse counting unit counts the count value of the pulse count by one pulse delay. The leakage detecting device according to any one of claims 41 to 43 wherein the waveform determining unit includes a count value changing unit, and a pulse output width of the pulse generated by the pulse generating unit is When the predetermined width is equal to or greater than the predetermined width, the count value changing unit changes the count value counted by the pulse counting unit. The leakage detecting device according to claim 51, wherein the pulse output width is a time width from an output start time point to an output end time point of the pulse generated by the pulse generating unit. The leakage detecting device according to claim 51, wherein the pulse output width is an output from a start time of an output of the first pulse generated by the pulse generating unit to a second pulse connected to the first pulse The time width from the start time point. The leakage detecting device according to claim 51, wherein the pulse output width is an output end time of the first pulse generated from the pulse generating unit to an output of the second pulse connected to the first pulse The time width until the end of the time. The leakage detecting device according to claim 51, wherein the pulse output width is a time width from an output start time point of the first pulse generated by the pulse generating unit to an output end time point of the second pulse . The leakage detecting device according to any one of claims 41 to 43 further comprising a pulse generation condition changing unit that is smaller than the predetermined number based on the pulse counting unit The count value is changed by the pulse generation condition of the pulse generation unit. The leakage detecting device according to claim 56, wherein the pulse generation condition changing unit changes at least one of a voltage threshold value and a pulse width threshold value, wherein the voltage threshold value is It is determined whether or not the pulse generation unit has generated the pulse, and the pulse width threshold is used when determining whether or not to count the pulse. The leakage detecting device according to any one of claims 41 to 43 wherein the pulse generating portion generates a pulse based on an output voltage of a positive side of the zero-phase current transformer, that is, a positive side pulse, And the pulse counting unit counts the positive side pulse and the negative side pulse with a pulse based on an output voltage of a negative side of the zero-phase current transformer, that is, a negative side pulse, and the number of the positive side pulse and the negative side When at least one of the number of pulses is a predetermined number or more, the second signal is input Out. The leakage detecting device according to any one of claims 41 to 43 further comprising a signal input unit that inputs a signal output indication signal, wherein the signal output indication signal is used to make the above The integral value comparing unit outputs the first signal or causes the waveform determining unit to output the second signal. The leakage detecting device according to claim 59, wherein the signal input unit inputs the signal output instruction signal from an external resistor. A leakage detecting device having a zero-phase current transformer that penetrates an alternating current circuit; an integral computing unit that integrates an output voltage of the zero-phase current transformer; and a leakage detecting unit that leaks according to an operation result of the integral computing unit The detection signal is outputted, and the leakage detection signal indicates that leakage has occurred in the AC circuit; and the calculation result output unit outputs the result based on the calculation result of the integration unit, wherein the calculation result output unit and the leakage detection unit are One module constituting the integral calculation unit obtains an effective value of an output voltage of the zero-phase current transformer using an integral calculation, or the integral calculation unit obtains the zero-phase current transformer by using an integral calculation The average value of the output voltage.