KR200440531Y1 - Earth leakage breaker - Google Patents

Abstract

The present invention relates to an earth leakage circuit breaker that detects an electric current leakage current and cuts off the power supply when an electric leakage current is generated. In addition, the electric power is supplied from the auxiliary power supply unit to detect the leakage current, and accordingly, the power supply of the commercial power supply is cut off.

Accordingly, the electric shock of the human body due to the leakage current and the fire caused by the leakage are prevented.

Earth leakage disconnection, auxiliary power

Description

Earth leakage breaker {CIRCUIT BREAKER}

1 is a block diagram showing the configuration of a general earth leakage breaker.

Figure 2 is a block diagram showing the configuration of the earth leakage breaker of the present invention.

* Explanation of symbols for main parts of the drawings

110: earth leakage detector 120: earth leakage breaker

130: earth leakage judgment unit 140: thyristor

150: trip coil 160: power supply

170: leakage test unit 180: auxiliary power supply unit

181: switch

The present invention relates to an earth leakage breaker that detects an earth leakage current when a current leakage occurs and cuts off the power supply. More specifically, the current leakage detection circuit detects a current leakage even when the power supply unit does not normally supply the operating power for the leakage current. An earth leakage circuit breaker capable of interrupting a power supply.

Earth leakage circuit breaker is used for the purpose of preventing electric shock accidents and fire caused by electric leakage by detecting electric leakage current caused by incomplete insulation in electrical equipment such as home appliances and cutting off electric power supply from commercial power. It is a safety device.

In addition, the earth leakage breaker is also used to protect the wires from overcurrent caused by a ground fault, to open and close the load, and to protect industrial electrical equipment.

Therefore, the earth leakage breaker is an indispensable device in our lives not only for the protection of human life and property but also for the protection of equipment. It is essential to use a reliable earth leakage breaker.

1 is a configuration diagram showing the configuration of a general earth leakage breaker.

Referring to FIG. 1, the ground fault breaker determines a ground fault detection unit 110 that detects a ground fault current and a ground fault for the ground fault current detected by the ground fault detection unit 110, and a ground fault that cuts off power supply of commercial power. It includes a circuit breaker 120 and a leakage test unit 170 for testing the operation of the ground fault blocking unit 120 and the power supply unit 160 for supplying the operating power to the ground fault blocking unit 120.

In detail, each portion of the ground fault breaker will be described in detail. The ground fault detection unit 110 includes an image current transformer and a sensitivity selection circuit to detect a ground fault current. The Zero Current Transformer (ZCT) normally enters the load 190 from the three-phase (R phase, S phase, T phase) commercial power supply 100, and the magnetic field generated by the same current exiting from the load 190. Since the offset cancels each other, and a leakage current occurs while detecting a zero value, the difference value is detected by the leakage current. The sensitivity selection circuit is a circuit for switching in a plurality of resistors connected in parallel, and selects and outputs a voltage level corresponding to the current detected by the image current transformer. In more detail, the user can set the rated sensitivity current, which means that an earth leakage blocking operation will be performed when a leakage current exceeding the set rated sensitivity current occurs. The rated sensitivity current is set differently according to the purpose of use and the mounting position. In general, the human electric shock should be 30 mA or less for the main protection purpose, and 100 mA, 200 mA or 500 mA to prevent leakage.

The ground fault blocking unit 120 includes a ground fault determination unit 130, a thyristor 140, and a trip coil 150.

The ground fault determining unit 130 is a dedicated IC that determines whether a ground fault is related to the ground fault current detected by the ground fault detection unit and outputs a control signal. The ground fault current detected by the ground fault detection unit is input to the ground fault determination unit 130 at a voltage level. Since the voltage level signal is weak, it is amplified by the ground fault determination unit 130 to determine whether or not to exceed a predetermined set value (rated sensitivity current). It is determined whether or not a short circuit. For example, when the rated sensitivity current set by the user is 100 mA, when a short circuit current occurs and the voltage level input to the earth leakage determination unit 130, that is, the current is about 50 mA, the earth leakage determination unit 130 determines a short circuit. I never do that.

The thyristors SCR or thyristor 140 is turned on when the ground fault determining unit 130 determines a ground fault and outputs a control signal.

The trip coil 150 trips the opening / closing mechanism part (not shown) when the thyristor 140 is turned on. Accordingly, the commercial power supply 100 and the load 190 are disconnected, and power supply to the load 190 is cut off.

The power supply unit 160 supplies power for the earth leakage blocking unit 120 to operate. The power supply unit 160 supplies the operating power by converting the AC power of the two-phase (R-phase, T-phase) line from the three-phase commercial power supply 100 to a DC power.

The ground fault test unit 170 is a part that allows the user to test the ground fault blocking operation. When the user turns on the switch of the ground fault test unit 170, a ground fault current is artificially generated through a coil wound around the current transformer, and accordingly, each part operates to trip the opening and closing mechanism. The user can detect a failure of the ground fault circuit breaker if the opening and closing mechanism is not tripped after operating the ground fault test unit 170.

In the ground fault circuit breaker as described above, when the power of the three-phase commercial power supply 100 is supplied to the load 190, when the ground fault detection unit 110 detects a ground fault current, the ground fault breaker determines whether the ground fault is detected or not. The earth leakage determining unit 130 of the unit 120 determines. In addition, the ground fault determining unit 130 outputs a control signal when the ground fault is determined, the thyristor 140 is turned on by the output control signal, accordingly the trip coil 150 is operated to trip the opening and closing mechanism. . In this case, the power supply for blocking the short circuit is provided by the power supply unit 160.

On the other hand, if the power supply unit 160 is unstable and does not normally supply operating power to the earth leakage breaker 120, the power supply of the commercial power supply 100 may not be blocked from being supplied to the load 190 even if a current leakage occurs. Problems arise. As a result, they are exposed to risks such as electric shocks and fires that may occur when a short circuit current occurs.

As a result, the ground fault breaker does not block the ground fault current even when the ground fault current occurs until the user operates the ground fault test unit 170 to detect and replace a fault of the ground fault breaker.

Therefore, an object of the present invention is to provide an earth leakage circuit breaker that detects an electric leakage current even when the power supply of the earth leakage breaker is unstable and thus does not properly supply power, thereby cutting off the power supply of commercial power.

An earth leakage circuit breaker of the present invention for achieving the above object, the earth leakage detection unit for detecting a current leakage current; An earth leakage blocking unit configured to determine whether the earth leakage current is detected by the earth leakage detection unit and cut off power supply of commercial power; A power supply unit supplying power to operate the earth leakage breaker; And an auxiliary power supply which operates when the power supply unit does not normally supply power to the earth leakage breaker to supply power to the earth leakage breaker.

The ground fault blocking unit may include: a ground fault determination unit configured to determine whether the ground fault is related to the ground fault current detected by the ground fault detection unit and output a control signal; A thyristor receiving the control signal output from the ground fault determining unit (on); And a trip coil which cuts off the power supply of the commercial power source by tripping the switch mechanism when the thyristor is turned on.

The apparatus may further include a ground fault test unit for testing a ground fault breaking operation of the ground fault breaker.

The auxiliary power supply unit includes a switch that is always on (on), the switch is turned off (off) when the ground fault test unit tests the ground fault breaking operation to supply the power of the auxiliary power supply to the earth leakage breaker It is characterized by blocking.

In addition, the auxiliary power supply is characterized in that the capacitor is connected in parallel to the power supply.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

However, in describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

Figure 2 is a block diagram showing the configuration of the earth leakage breaker of the present invention.

Referring to FIG. 2, the electric leakage breaker operating when the electric current of the three-phase commercial power supply 100 is supplied to the load 190 includes an electric leakage detecting unit 110 detecting an electric leakage current, and an electric leakage detecting unit ( An earth leakage test unit 170 that determines whether the earth leakage current is detected by the leakage current detecting unit 110 and cuts off the power supply of the commercial power source, and tests the operation of the earth leakage blocking unit 120. It includes a power supply unit 160 for supplying the operating power to the earth leakage breaker 120 and the auxiliary power supply unit 180 to operate when the power supply unit 160 does not normally supply power. Here, the parts described in FIG. 1 will be omitted, and the auxiliary power supply unit 180, which is the core of the present invention, will be described later.

The auxiliary power supply unit 180 is a capacitor connected to the power supply unit 160 in parallel. The capacitor stores power and supplies power when the power supply unit 160 is unstable to supply power to the earth leakage blocking unit 120 normally.

In addition, the auxiliary power supply unit 180 includes a switch 181 which is always on. The switch 181 is connected to the circuit to operate in conjunction with the operation of the electrical leak test unit 170. That is, when the switch of the ground fault test unit 170 is turned on, the switch 181 is turned off, so that the power of the auxiliary power supply unit 180 is not supplied to the ground fault interrupting unit 120. I can't. The earth leakage test unit 170 and the switch 181 to operate in conjunction with the power supply unit 160 is unstable, when the power supply is not normal, the earth leakage breaker can be replaced by informing the user of the failure of the earth leakage breaker. To make it work.

Therefore, the earth leakage breaker of the present invention, when the power supply unit 160 is unstable or the circuit breakage can not normally supply the operating power to the earth leakage breaker 120, the auxiliary power supply unit 180 supplies the operating power to the earth leakage breaker 120 ), It is possible to trip the switching mechanism by detecting the leakage current at the time of occurrence of the leakage current. In detail, when the ground fault detecting unit 110 detects a ground current, the ground fault determination unit 130 determines whether the ground fault is present. In addition, when the ground fault determination unit 130 determines a ground fault, the control signal is output, and the output control signal turns on the thyristor 140, and accordingly, the trip coil 150 operates to trip the opening and closing mechanism.

In addition, when a user turns on the switch of the ground fault test unit 170 at the time of the abnormality of the power supply unit 160, the switch 181 of the auxiliary power supply unit 180 operating in conjunction with the ground fault test unit 170 is turned off. As the power is turned off, the power supply of the auxiliary power supply unit 180 is stopped to the earth leakage blocking unit 120, and the opening and closing mechanism is not tripped. Therefore, the user can know the failure of the ground fault breaker.

On the other hand, while the invention has been shown and described in connection with a specific preferred embodiment, those skilled in the art to which the present invention belongs will vary within the scope without departing from the scope of the invention with respect to the above-described embodiment It can be easily seen that it can be modified and changed. Therefore, the scope of the present invention should not be limited to the embodiments described, but should be defined by the utility model registration claims as described below and equivalents to the utility model registration claims.

As described in detail above, according to the present invention, when the power supply unit of the earth leakage breaker does not normally supply the operating power to the earth leakage breaker, the auxiliary power supply may supply the operating power to the earth leakage breaker to trip the switch mechanism when the earth leakage current occurs. To help.

As a result, users are safe from the risk of human electric shock and fire which may be caused by a leakage current.

Claims (5)

An electric leakage detecting unit detecting an electric leakage current; An earth leakage blocking unit configured to determine whether the earth leakage current is detected by the earth leakage detection unit and cut off power supply of commercial power; A power supply unit supplying power to operate the earth leakage breaker; An earth leakage test unit for testing an earth leakage blocking operation of the earth leakage blocking unit; And An auxiliary power supply which operates when the power supply does not normally supply power to the earth leakage breaker to supply power to the earth leakage breaker; The auxiliary power supply unit includes a switch that is always on, and the switch is turned off when the ground fault test unit tests a ground fault breaking operation so that the power of the auxiliary power supply unit is supplied to the ground fault interrupting unit. Earth leakage breaker, characterized in that to block the thing. The method of claim 1, The earth leakage breaker A ground fault determining unit configured to determine whether the ground fault current is detected by the ground fault detection unit and output a control signal; A thyristor receiving the control signal output from the ground fault determining unit (on); And And a trip coil configured to trip an opening / closing mechanism when the thyristor is turned on to cut off power supply of commercial power. delete delete The method of claim 1, The auxiliary power supply circuit breaker, characterized in that the capacitor is connected in parallel to the power supply.

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