JP5640255B2 - Grounding system connection status confirmation system - Google Patents

Description

According to the present invention, an electrical terminal provided on the ground is electrically connected to a protective ground conductor for grounding an equipment or the like through a ground wire electrically connected to the electrical terminal. The present invention relates to a grounding system connection state confirmation system for confirming a grounding state.

Conventionally, the protection of wiring when overcurrent or short-circuit current flows in the circuit, the electric fire in the case where a ground fault occurs due to the deterioration of the insulation of the circuit or the load device, and the insulation of the load device as well As a result of the deterioration of the battery, a potential is generated between the earth and the casing that constitutes the load device, and various electrical accidents such as electric shocks that may occur when the human body touches the load device cause human life and property damage. In order to ensure safety, various power distribution devices have been developed, including wiring breakers and earth leakage breakers.

In particular, in order to prevent electrical accidents caused by the electric shock of the human body, the installation of earth leakage circuit breakers was obligated by the Industrial Safety and Health Regulations in 1969, and the number of deaths due to electric shocks has been decreasing year by year.

In order to distribute power to the load circuit, these various types of power distribution equipment are housed in a cabinet, and a distribution board incorporating the power distribution equipment inside the cabinet has traditionally been used in factories and homes. It is used.

Well, it is well known that even before the installation of earth leakage circuit breakers became mandatory, protective grounding of equipment was carried out from the viewpoint of preventing electric shock accidents, and results were achieved in preventing electric shock accidents in the human body. It is.

For example, as shown in FIG. 9, even when the insulation of a load device installed in an electric circuit deteriorates and a ground voltage _Vg is generated between the ground and the housing of the load device, the ground resistance has no influence on the human body. Is as follows.

The R _B B type grounding resistance, represented the _{R D} D type grounding resistance, the _{V E} as path _{voltage, V g = {R D /} (R B + R D)} V E ··· ( Equation 1) and . Here, assuming that the resistance of the human body is 1 kΩ and the human body passage allowable current is 30 mA, which is limited to several minutes (electric shock current by Mr. Bigetzmeier and the physiological reaction of the human body), V _g = 30 V is assumed as the ground voltage. It is considered the upper limit of tolerance.

When path voltage _{V E} is 200V, by calculating by substituting _{V g} in Formula _{1, R B = 5.7R D ···} ( Equation 2), and the B type grounding resistance magnitude 10Ω In this case, since R _D ≈1.7Ω, the D-type ground resistance may be set to about 1.7Ω or less.

However, this ground resistance of 1.7Ω or less is actually a low ground resistance value that is difficult to obtain by normal installation work. When the ground is grounded, the soil is subjected to scientific treatment. For example, even if the ground resistance is obtained by using a ground resistance reducing agent using an inorganic high water content crystal, the ground resistance is maintained over time. In addition, it is difficult to check the grounding resistance over time because the surrounding environment often changes from the time when the grounding work was performed. Was that.

In this way, electrical accidents due to electric shock from human bodies have been conventionally prevented by protective grounding work for equipment, etc., but in addition to grounding, by installing the above earth leakage breaker in the circuit, If the insulation of the equipment deteriorates and a leakage current of a specified magnitude occurs in the circuit, the circuit breaker interrupts the circuit, eliminating the risk of electric shock and preventing it more effectively. It can be done. However, even if the earth leakage breaker is installed in the electric circuit, if the grounding work is not sufficient, the time between the contact of the human body with the load equipment with deteriorated insulation and the breaking operation of the earth leakage breaker In this case, the leakage current will flow through the human body, and the possibility of an electric shock accident cannot be completely denied.

Thus, grounding is very important for ensuring the safety of human lives and property from various electrical accidents regardless of the presence or absence of the earth leakage breaker.

In view of the importance of such grounding, the distribution board also has a ground branch line terminal for connecting the ground pole wiring, that is, the ground branch line, for example, “Japan Wiring Equipment Manufacturers Association Standard JWDS 0007 Residential distribution board” ”Describes its structure.

As for the distribution board provided with such a ground wire branch terminal, for example, one having a ground relay terminal as shown in Patent Document 1 and Patent Document 2 is known.

By the way, when the grounding work is performed, the grounding resistance, that is, the resistance between the ground and the grounding electrode which is an electrical terminal provided on the ground, depends on the kind of grounding work. It is necessary to check whether or not a predetermined resistance value is satisfied.

The grounding work is as described in “Technical Standards for Electrical Equipment”. According to Article 19 of the Interpretation of Technical Standards,
“Grounding work shall be conducted in accordance with Article 13 [Insulation of electrical circuits] No. 6 and No. 7 (a), Article 23 [Grounding of service entrances], Article 28 [Electrical equipment grounding] ] Paragraphs 1, 2 and 4 and Article 42 [Grounding of lightning arresters] When grounded under the provisions of Nos. 2a, 3a, b), and the same high voltage overhead wire as the special high voltage overhead wire Except for the case where grounding work is performed on the parts to be installed on the support, the following four types are listed in the left column, and the grounding resistance value in each grounding work depends on the type of grounding work listed in the left column of the table. According to the type of each grounding work, the grounding resistance value is 10Ω in the case of Class A grounding work, and in the case of Class B grounding work. Is the amperage of the 1-wire ground fault current of the high-voltage side or extra high-voltage side of the transformer (150 When the ground voltage of the low piezoelectric circuit exceeds 150 V due to the contact between the extra high voltage circuit and the low voltage circuit, the operating voltage is less than 35,000 V, and the high voltage circuit is automatically used within 2 seconds. 300 when installing a device that cuts off a special high voltage circuit with a voltage of 35,000 V or less, and 600) when installing a device that automatically cuts off a high voltage circuit within a second or a voltage of 35,000 V or less. In the case of class C grounding work, the number of ohms equal to the divided value is 10Ω (when installing a device that automatically shuts off the electric circuit within 0.5 seconds when grounding occurs on the electric circuit in a low piezoelectric circuit) 500Ω), 100Ω for class D grounding work (500Ω when installing a device that automatically shuts off the electric circuit within 0.5 seconds when the electric circuit is grounded on a low piezoelectric circuit) , Ground resistance value is defined.

As a method for measuring the ground resistance value, the following method has been proposed conventionally.

First, in addition to the grounding electrode that measures the desired grounding resistance, two auxiliary electrodes are used, and each electrode is placed in the soil at intervals of several meters so that it becomes the apex of the triangle. This is a so-called Kolash Bridge method in which the target ground resistance is measured by measuring the resistance between vertices.

Second, in addition to the ground electrode that measures the desired ground resistance, two auxiliary electrodes are used, each electrode is placed in a straight line in the soil, and the desired ground resistance is measured at one end. A ground electrode is disposed, one auxiliary electrode is installed at the other end separated by several tens of meters, the other auxiliary electrode is disposed between the ground electrode and the other auxiliary electrode, and the other end is disposed. This is a so-called electrode voltage drop method in which a target ground resistance is measured by passing a current between the auxiliary electrode and the ground electrode and measuring a voltage generated between the other auxiliary electrode and the ground electrode.

Third, without using an auxiliary electrode, several tens of meters of electric wire is routed on the ground, and the capacitor component formed between the electric wire and the ground and the inductance component present in the electric wire are used to achieve the target. By applying a high-frequency signal via a known resistance between the grounding electrode for measuring the grounding resistance and the electric wire to cause resonance, the capacitor component and the inductance component are canceled out, and the high-frequency voltage at resonance and the terminal This is a method using so-called resonance in which the ground resistance is measured by measuring the voltage.

However, in these measurement methods, it is necessary to drive each auxiliary electrode used for measurement into the soil, and to arrange each electrode on a triangle or a straight line with a certain distance, and therefore, between the electrodes. The distance and the length of the wire used for measurement are several tens of meters. Actually, it is necessary for measurement because the surroundings to be measured are paved with concrete or asphalt, and the neighbors and fences are installed. In many cases, it is difficult to measure the ground resistance.

In addition, it is necessary to drive each auxiliary electrode used in the measurement into the ground, and to place each electrode on a triangle or straight line with a distance of several tens of meters. Was very laborious and labor intensive.

Based on the importance of grounding and the effort of measuring grounding resistance, the technology for adjusting the grounding resistance value to fall within the specified range and the measurement at places where grounding resistance measurement is difficult have been improved. Patent Documents 3 to 5 disclose techniques for improving work efficiency as follows.
Japanese Patent Laid-Open No. 2000-201402 FIG. Japanese Patent Laid-Open No. 2000-201407 FIG. JP 2006-275623 A FIG. Japanese Patent Laid-Open No. 2007-163139 FIG. Japanese Patent Laid-Open No. 2007-127558 FIG.

However, there is no disclosure of a system for easily checking the ground resistance after grounding work or a system for checking the ground resistance over time. Needed. In addition, even if the grounding work itself is done properly, the grounding system functions for the first time when the above-mentioned protective grounding conductor and the grounding electrode are properly connected. It is important to be able to confirm whether the system is functioning normally.

Moreover, the grounding resistance is expected to change depending on the environmental conditions surrounding the grounding system over time, taking into account the deterioration of functionality due to aging of various connection parts in the grounding system. It is desirable to be able to easily check whether the grounding system is functioning normally.

Furthermore, since the grounding state of the grounding system is related to electrical security, it is desirable that the information regarding the grounding state can be quickly confirmed and grasped even outside the place where the grounding work has been performed.

In view of such problems, the present invention can reduce the labor required for the measurement work of the state of the grounding system as much as possible after the grounding work is performed, and whether or not the grounding system functions normally over time. Also, it is an object of the present invention to provide a grounding system connection status confirmation system that can be quickly confirmed and grasped outside the place where grounding work has been performed.

In order to achieve the above object, claim 1 of the present invention provides:
The neutral wire side of the secondary winding of the transformer interposed in the electric circuit is grounded by providing a first electrical terminal on the ground, and the second side provided on the ground in the load-side electric circuit of the transformer. A ground configured by electrically connecting an electrical terminal to a protective ground conductor that performs D-type grounding, such as a device, via a ground line electrically connected to the second electrical terminal. In the electric circuit provided with the system, the voltage side or neutral line of the secondary winding of the transformer, the connection part connected to the ground system, and the connection part are connected to the load side electric circuit of the transformer. A voltage application unit for applying a voltage between the electric circuit and the ground system, a current detection unit for detecting a current flowing between the electric circuit and the ground system by the voltage applied by the voltage application unit, and the current detection unit If a current is detected, the grounding system is connected. If the current is not detected, the determination unit determines that the grounding system is not connected, and the connection state of the grounding system from the determination result and measurement data by the determination unit A grounding system state data generation unit including a data generation unit that generates grounding system state data and a transmission unit that transmits the generated grounding system state data is provided, and on the transformer side of the load side electric circuit, A receiving unit that receives the grounding system state data transmitted from the grounding system state data generation unit; an aggregated data generation unit that aggregates the received grounding system state data; and a storage unit that holds the aggregated data An aggregation unit is provided to allow the aggregation unit to hold the grounding system state data, while the aggregation unit is further provided outside the grounding system. A transmission unit that transmits the aggregated data to a server, and a display unit that displays the grounding system state data or the aggregated data so that the grounded system state data or the aggregated data can be visually recognized from the outside of the aggregation unit. A storage unit for storing identification data for specifying a communication source when communicating with the aggregation unit or the server is provided, and the grounding system state data obtained by the grounding system state data generation unit is communicated using the identification data. and transmits to the server to identify the communication source when, in which grounding system state data on the display unit of the grounding system state data generating unit is provided with grounding system connection status confirmation system so as to be displayed .

According to such a grounding system connection state confirmation system, since grounding system state data indicating the grounding system connection state can be confirmed by the aggregation unit provided on the transformer side, it takes a work of measuring the state of the grounding system. In addition to reducing labor as much as possible, it is possible to quickly confirm and grasp whether the grounding system is functioning normally over time.

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In addition, by transmitting the grounding system state data to an external server, it is possible to grasp the grounding system connection state outside the place where the grounding system state data is collected.

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Further, since the grounding system state data or the aggregated data can be held and displayed on the aggregation unit side, the connection state of the grounding system can be easily grasped from the outside of the aggregation unit, and the server The ground system status data accumulated on the side can be clearly identified from which ground system status data generation unit, and even when viewed over time, the data from a specific ground system status data generation unit This is effective for statistical processing and extraction. Further, even when there are a plurality of grounding system state data generation units, it is possible to avoid confusion when performing data processing by specifying individual grounding system state data generation units, and to perform data processing efficiently. it can.

The grounding system state data generation unit further includes a display unit for displaying the grounding system state data so as to be visible from the outside of the grounding system state data generation unit,
A storage unit for holding the grounding system state data;
A read processing unit for reading out the grounding system state data held in the storage unit; and a transmission unit for transmitting the grounding system state data to a server provided outside the grounding system. A grounding system connection state confirmation system may be provided in which the ground system state data obtained by the grounding system state data generation unit is transmitted to the server while data is displayed.

According to such a ground system connection state confirmation system, since the ground system state data can be displayed on the ground system state data generation unit side, it is easy to connect the ground system from the outside of the ground system state data generation unit. Can grasp.

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Also, by transmitting the ground system state data obtained by the ground system state data generating unit to the server provided outside, the ground side system state data is accumulated and grasped on the server side, and the state of the ground system is confirmed. If it is not normal, necessary processing can be performed. In addition, it is possible to accumulate and grasp the status of the grounding system over time.

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The ground system state data generation unit further includes a trigger signal reception unit that receives a trigger signal for newly generating ground system state data in the data generation unit, and the trigger signal reception unit receives the trigger signal. In this case, a grounding system connection state confirmation system may be provided, characterized in that grounding system state data is generated and the grounding system state data is transmitted to the aggregation unit or server.

According to such a grounding system connection state confirmation system, grounding system state data can be actively collected when the aggregation unit determines that grounding system state data is necessary. Further, when the server determines that the ground system state data is necessary, the ground system state data can be actively collected, and the ground system state data can be collected when necessary.

The aggregation unit further includes a trigger signal receiving unit that receives a trigger signal for newly collecting grounding system state data at the aggregated data generation unit, and when the trigger signal is received at the trigger signal receiving unit, The grounding system connection status confirmation system may be provided by aggregating the grounding system status data, generating aggregated data, and transmitting the aggregated data to a server.

Thereby, according to the ground system connection state confirmation system, when the server determines that the aggregated data is necessary, the aggregated data can be actively collected, and the aggregated data can be collected when necessary. .

According to the present invention, after the grounding work is performed, the labor for measuring the state of the grounding system can be reduced as much as possible, and whether the grounding system is functioning normally over time, Therefore, it is possible to provide a grounding system connection status confirmation system that can be quickly confirmed and grasped even in places other than where the grounding work has been performed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each of the embodiments, the neutral wire side of the secondary winding of the transformer interposed in the electric circuit is grounded by providing the first electric terminal on the ground, and the first side provided on the ground on the load side of the electric circuit. In a grounding system constituted by two electrical terminals being electrically connected to a protective ground conductor for grounding equipment or the like via a ground wire electrically connected to the electrical terminal, Connected to the voltage line or neutral line on the load side and the grounding system, the grounding system state data indicating the connection state of the grounding system is generated by the data generation unit, and the generated grounding system state data is transmitted from the transmission unit A grounding system state data generation unit
On the transformer side, a receiving unit that receives the ground system state data transmitted from the ground system state data generation unit, and an aggregation unit that includes a storage unit that holds the received ground system state data, It is an object of the present invention to provide a grounding system connection state confirmation system for confirming the connection state of the grounding system and easily grasping whether or not the grounding system is functioning normally.

In addition to general electric equipment, equipment includes general equipment that needs to be grounded, such as building equipment, copper strips provided in buildings, electric wires, and cubicle housings.

Also, in this application, as defined in JEAC8001, an extension regulation electrical equipment usage facility edition published by the Japan Electric Association, a neutral wire is a wire connected to the neutral pole of a power source of a multi-wire circuit. A neutral wire or a grounded wire that is grounded according to technical requirements in the low piezoelectric path is called a grounded electric wire. For example, in a single-phase three-wire circuit, there are L1 and L2 poles as voltage poles and N poles as neutral poles. In the single-phase two-wire circuit, there is a ground-side electric wire that is grounded with the voltage electrode.

(First embodiment)
FIG. 1 shows a first embodiment of the present invention.

In the first embodiment, an electrical terminal 105 provided on the ground 1 is grounded via an earthing connection 106 electrically connected to the electrical terminal 105. In order to confirm the state of the grounding system formed by electrically connecting the protective earthing conductor 107 to the protective earthing conductor 107, the voltage line 101 or the neutral line 102 on the load side of the electric circuit and the protection A ground system state data generating unit 300 for generating ground system state data is provided between the ground conductor 107 and the neutral line 102 on the secondary winding side of the transformer 100 and the voltage line 101 interposed in the electric circuit. The grounding system state data obtained from the grounding system state data generation unit 300 The grounding system state data aggregation unit 400 for aggregating data provided shows the grounding system connection status confirmation system 1 can check the state of the grounding system in the grounding system condition data aggregation unit 400.

The neutral wire 102 side of the transformer 100 interposed in the electric circuit is grounded by the first electric terminal 103 and constitutes a load-side electric circuit together with the voltage line 101.

FIG. 2 shows a block diagram of the grounding system state data generation unit 300.
Reference numeral 360 denotes a grounding system state measuring unit that measures the grounding system state, which will be described later. The measurement data of the grounding system measured by the grounding system state measuring unit 360 is input to a grounding system state data generating unit that generates grounding system state data indicating the state of the grounding system indicated by 320. The grounding system state data generation unit 320 is configured using a microcomputer. The ground system state data generated by the ground system state data generation unit 320 is transmitted from the transmission unit indicated by 310 toward the ground system state data aggregation unit 400.

The ground system status data generated by the ground system status data generation unit 320 is displayed on the display unit 340. The data to be displayed is generated based on the ground system state data obtained from the ground system state measurement unit 360 by the microcomputer used in the ground system state data generation unit 320. Specifically, it is composed of a microcomputer having a character generator function. The display data is data that can grasp the state of the grounding system such as the measured value and the connection state of the grounding system, and is output toward the display unit 340.

The display unit 340 is configured using a liquid crystal display. The liquid crystal display appropriately displays the character display data described above. The display unit 340 may be configured using an organic EL display having a display function that can be visually recognized from the outside, an LED, or the like.

In order to display more simply, a plurality of LEDs are used as the display unit 340, and the display is distinguished according to the LED display color. When it is determined that the ground connection state is good, the green LED is turned on. The red LED may be lit when it is determined that the ground connection state is not good. Further, the display data may be generated by the grounding system state data generation unit 320, or the display data may be generated on the display unit 340 side.

An identification data storage unit 350 is configured using a memory. The identification data storage unit 350 is for storing identification data provided to distinguish from which grounding system state data generation unit the grounding system state data is transmitted. When generating the ground system state data, the ground system state data generation unit 320 reads the identification data from the identification data storage unit 350 and adds the identification data to the ground system state data to generate data. Then, the transmission system 310 transmits ground system state data.

The identification data stored in the identification data storage unit 350 may be configured by assigning a unique number such as a MAC address (Media Access Control address) used for Ethernet (registered trademark), for example. Further, when transmission of grounding system state data is performed using Ethernet (registered trademark), the MAC address itself may be used as identification data.

The grounding system state data aggregation unit 400 that receives the grounding system state data can understand which grounding system state data is transmitted from which grounding system state data generation unit 300 by analyzing the identification data. it can. For grasping, it is preferable to store a conversion table in which the identification data and the grounding system state data generating unit are associated with each other in the grounding system state data aggregation unit, and grasp when collecting the data.

FIG. 3 shows a block diagram of the grounding system state data aggregation unit 400.
Reference numeral 410 denotes a receiving unit that receives the ground system state data transmitted from the ground system state data generation unit 300. The ground system state data received by the receiving unit 410 is sent to an aggregate data generation unit 420 that aggregates the ground system state data. The aggregated data generation unit 420 is configured by using a microcomputer, and by processing the grounding system state data, it is separated into identification data and grounding system state data, and the identification data, grounding system state data, Are stored in a storage unit 450 configured using a memory.

The aggregated data is displayed on the display unit 440. The data to be displayed is generated based on the grounding system state data obtained from the grounding system state data generation unit 300 by the microcomputer used in the aggregate data generation unit 420. Specifically, it is composed of a microcomputer having a character generator function. The display data is data that can grasp the state of the grounding system, such as the identification number of the grounding system state data generation unit, the measured value, and the connection state of the grounding system, and is output to the display unit 440.

The display unit 440 is configured using a liquid crystal display. The liquid crystal display appropriately displays the character display data described above. In addition, the display unit 440 may be configured using an organic EL display having a display function visible from the outside, an LED, or the like.

For simpler display, a plurality of LEDs are used as the display unit 440, and the display is distinguished according to the display color of the LEDs. When it is determined that the ground connection state is good, the green LED is turned on. The red LED may be lit when it is determined that the ground connection state is not good.

The display data may be created by the display unit 440 in addition to the aggregated data generation unit 420.

The data communication between the grounding system state data generation unit 300 and the aggregation unit 400 may be configured in either a wired or wireless form, but wireless is particularly preferable in the present embodiment.

As a wireless communication means, a wireless LAN type communication device compliant with the commonly used IEEE 802.11 standard may be used. In this case, as is well known, it is not necessary to provide a communication line between the grounding system state data generation unit 300 and the aggregation unit 400, but by using a general IEEE802.11 standard, The communication system can be easily identified, that is, the grounding system state data generation unit 300 and the aggregation unit 400 can be easily identified. Installation work can be performed easily.

As other wireless communication means, various other wireless communication methods such as a specific low power wireless method, Bluetooth (registered trademark) method, IrDA using infrared rays, or the like may be used. Further, as a means for wired communication, a general wired communication system such as a PLC system that superimposes data on an electric wire, IEEE802, USB, or IEEE1394 system can be used.

The grounding system state data generation unit performs program processing so as to periodically generate grounding system state data. Although the cycle is set to be monthly, it is advisable to increase or decrease the frequency as needed according to the necessity of grasping the memory capacity or the state of the grounding system.

Next, the grounding system state measuring unit 360 will be described.
As a measurement of the grounding system state performed in the present embodiment, a power source is connected between the electric circuit and the grounding system, a current flowing between the electric circuit and the grounding system is detected, and a voltage between the electric circuit and the grounding system is measured. The following describes the measurement to detect the voltage, the measurement performed by switching the pole (voltage line / neutral line) of the electric circuit, and the measurement performed by separating / connecting the grounding system.

FIG. 4 shows an explanatory diagram of measurement in which a power source is connected between the electric circuit and the grounding system, and a current flowing between the electric circuit and the grounding system is detected. The grounding performed by the first electrical terminal 103 on the neutral wire 102 side of the secondary winding of the transformer 100 is class B grounding as indicated in the technical standards for electrical equipment, and protective grounding is provided on the load side of the electric circuit. The grounding that the conductor 107 is made by the second electrical terminal 105 through the grounding wire 106 is a D-type grounding.

At this time, when the B-type grounding and the D-type grounding are performed, the protective grounding conductor 107 includes the grounding wire 106, the second electrical terminal 105, the ground 104, and the first electrical terminal. It is in a state of being connected to the neutral wire 102 via 103. That is, if the B class ground resistance is R _B and the D class ground resistance is R _D , the combined resistance between the protective ground conductor 201 and the neutral wire 102 is
R _Total = R _B + R _D (Expression 3)

In this case, the power supply device 361 is connected to the neutral wire 102 and the protective ground conductor 107 on the load side of the electric circuit, and a voltage (voltage is set to E) is applied. The power supply device 301 may use an AC power supply or a DC power supply. An insulated power source in which the primary side and the secondary side are insulated may be used as the power source. Moreover, you may comprise using a capacitor | condenser as a DC power supply, for example.

Next, the current measuring means 362 measures the current flowing between the neutral wire 102 and the protective ground conductor 107 (current is I). The current measuring means 362 may be configured using a current transformer (CT) or a Hall element, or may be configured using other general current sensors. Here, when the B type grounding and the D type grounding are performed, the combined resistance between the protective ground conductor 107 and the neutral wire 102 is R _Total = R as shown in (Equation 3). _Since it is expressed as _B + _RD , when voltage E is applied,
E / (R _B + R _D ) (Formula 4)
Is detected by the current measuring means 362.

At this time, when the current I is detected, it is a case where the B-type grounding and the D-type grounding are performed, so that the determination unit 363a determines that the grounding system is connected. .
When the current I is not detected, the protective ground conductor 107 is connected to the neutral wire 102 via the ground wire 106, the second electrical terminal 105, the ground 104, and the first electrical terminal 103. Since it is not connected, it is determined that the grounding system is not connected.
The determination unit 363a may be configured using a microcomputer or an IC, and may perform the determination by setting a threshold value for the detection current expressed by the relationship of (Equation 4), or may be a resistor / diode. The determination may be made by configuring an electronic circuit using an operational amplifier or the like and detecting the magnitude of the detection current.

The determination result by the determination unit 363a and the measurement data of the grounding system are sent to the grounding system state data generation unit 320. The grounding system state data generating unit 320 generates measurement data of the grounding system, data that can grasp the state of the grounding system, such as whether the connection state of the grounding system is good or not, and whether the function is normal or abnormal.

Specifically, data of a power supply voltage value, a detected current value, and a resistance value obtained by calculation are generated as measurement data. Also, determination data of good / normal / bad (needs improvement) is generated as the connection state of the grounding system. Judgment of the connection state is based on a predetermined value of grounding resistance in grounding work, and a threshold value is determined based on a relative deviation from the reference value. For example, grounding resistance value in class D grounding (100Ω or less) is used as a reference. It is better to determine that 10Ω or less is good, 10Ω or more and 110Ω or less is normal, and 110Ω or less is bad. Further, it may be configured such that the stage can be made finer and the state of “relatively bad” and “slightly good” can be set so that the state of the grounding system can be grasped in more detail.

In this way, the connection state of the ground system is determined by applying a voltage between the neutral wire in the electric circuit and the protective ground conductor, and detecting the current flowing between the neutral wire and the protective ground conductor. Can be confirmed.

The determination may be made by applying a voltage between the voltage line 101 side of the secondary winding of the transformer 100 interposed in the electric circuit and the protective ground conductor 107.

At this time, when the B-type grounding and the D-type grounding are performed, the protective grounding conductor 107 includes the grounding wire 106, the second electrical terminal 105, the ground 104, and the first electrical terminal. 103, the neutral wire 102, and the voltage wire 101 side are connected through the secondary winding of the transformer. That is, if the class B ground resistance is R _B , the class D ground resistance is R _D , and the impedance of the secondary winding of the transformer is Z _L (= jωL: L is the inductance of the coil), The combined impedance with the sex line 102 is
Z _Total = R _B + R _D + Z _L (Expression 5)

In this case, the power supply device 301 is connected to the voltage line 101 and the protective ground conductor 107 on the load side of the electric circuit, and a voltage (voltage is set to E) is applied.

Next, a current (current is I) flowing between the voltage line 101 and the protective ground conductor 107 is measured by current measuring means. Here, when the B type grounding and the D type grounding are performed, the combined resistance between the protective ground conductor 107 and the voltage line 101 is Z _Total = R _{B as shown in} (Equation 5). Since + R _D + Z _L , when voltage E is applied,
_{E / (R B + R D} + Z L) ··· ( Formula 6)
A current I expressed by the magnitude of is detected.

At this time, when the current I is detected, it is a case where the B type grounding and the D type grounding are performed, so that the determination unit 363a determines that the grounding system is connected. . When the current I is not detected, the protective ground conductor 107 is connected to the ground wire 106, the second electrical terminal 105, the ground 104, the first electrical terminal 103, the neutral wire 102, the transformer. Therefore, it is determined that the grounding system is not connected because it is not connected to the voltage line 101 side through the secondary winding.

In this way, the connection state of the ground system is confirmed by applying a voltage between the voltage line in the electric circuit and the protective ground conductor, and detecting the current flowing between the voltage line and the protective ground conductor. be able to.

FIG. 5 shows an explanatory diagram of the measurement for detecting the voltage between the electric circuit (neutral wire) and the grounding system.
At this time, when the B-type grounding and the D-type grounding are performed, the protective grounding conductor 107 includes the grounding wire 106, the second electrical terminal 105, the ground 104, and the first electrical terminal. It is in a state of being connected to the neutral wire 102 via 103. That is, if the B class ground resistance is R _B and the D class ground resistance is R _D , the combined resistance between the protective ground conductor 107 and the neutral wire 102 is
R _Total = R _B + R _D (Expression 3)

In this case, the voltage measuring means 364 measures the voltage between the neutral wire 102 and the protective ground conductor 107 on the load side of the electric circuit. The voltage measuring means 364 may be configured by an electronic circuit, or may be configured by using a microcomputer or IC having a voltage measuring function, other voltage sensors, or the like.

Here, when the B type grounding and the D type grounding are performed, the combined resistance between the protective ground conductor 107 and the neutral wire 102 is R _Total = R as shown in (Equation 3). _Since it is expressed as _B + R _D , the voltage between the neutral wire 102 and the protective ground conductor 107 simply corresponds to the voltage at the open end of the resistance circuit in which the combined resistor is interposed, and the neutral wire and voltage A measured voltage value of approximately zero volts is detected with respect to the line-to-line voltage.

Further, when the B type grounding and the D type grounding are not performed, an open section exists in the middle of the resistance circuit in which the combined resistance is interposed, and the voltage is not stable. In other words, the measured voltage value is not approximately zero volts with respect to the line voltage between the neutral line and the voltage line.

When a measured voltage value of approximately zero volts is detected with respect to the line voltage between the neutral line and the voltage line, it is the case where the B type grounding and the D type grounding are performed. It is determined by 363b that the grounding system is connected. In addition, when the measured voltage value is not approximately zero volts with respect to the line voltage between the neutral line and the voltage line, the protective ground conductor 107 is connected to the ground line 106 and the second electrical line. It is determined that the grounding system is not connected because it is not connected to the neutral wire 102 via the target terminal 105, the ground 104, and the first electrical terminal 103.

The determination result by the determination unit 363a and the measurement data of the grounding system are sent to the grounding system state data generation unit 320. The grounding system state data generating unit 320 generates measurement data of the grounding system, data that can grasp the state of the grounding system, such as whether the connection state of the grounding system is good or not, and whether the function is normal or abnormal. In this case, the detected voltage value may be indicated as measurement data.

Thus, the connection state of the grounding system can be confirmed by detecting the voltage between the neutral wire in the electric circuit and the protective grounding conductor.

FIG. 6 shows an explanatory diagram of the measurement for detecting the voltage between the electric circuit (voltage line) and the ground system.

At this time, when the B-type grounding and the D-type grounding are performed, the protective grounding conductor 107 includes the grounding wire 106, the second electrical terminal 105, the ground 104, and the first electrical terminal. 103, the neutral wire 102, and the voltage wire 101 side are connected through the secondary winding of the transformer. That is, if the class B ground resistance is R _B , the class D ground resistance is R _D , and the impedance of the secondary winding of the transformer is Z _L (= jωL: L is the inductance of the coil), The combined impedance with the sex line 102 is
Z _Total = R _B + R _D + Z _L (Expression 5)

In this case, the voltage measuring means 364 measures the voltage between the voltage line 101 and the protective ground conductor 107 on the load side of the electric circuit.

Here, when the B type grounding and the D type grounding are performed, the combined impedance between the protective ground conductor 107 and the voltage line 101 is Z _Total = R _{B as shown in} (Equation 5). + R _D + Z _L , the voltage between the voltage line 101 and the protective ground conductor 107 simply corresponds to the voltage at the open end of the resistor-coil series circuit in which the combined impedance is interposed. A measured voltage value approximately equal to the line voltage between the sex line and the voltage line is detected.

When the B type grounding and the D type grounding are not performed, an open section exists in the middle of the resistance circuit in which the combined impedance is present, and the voltage is not stable. That is, a measured voltage value that is not substantially equal to the line voltage between the neutral line and the voltage line is measured.

When a measured voltage value that is substantially equal to the line voltage between the neutral line and the voltage line is detected, the B-type grounding and the D-type grounding are performed, so the determination unit 363c Thus, it is determined that the grounding system is connected. When the measured voltage value is not substantially equal to the line voltage between the neutral line and the voltage line, the protective ground conductor 107 is connected to the ground line 106 and the second electrical line. Since the terminal 105, the ground 104, the first electrical terminal 103, the neutral wire 102, and the secondary winding of the transformer are not connected to the voltage line 101 side, the ground system is connected. Judge that it is not.

The determination result by the determination unit 363a and the measurement data of the grounding system are sent to the grounding system state data generation unit 320. The grounding system state data generating unit 320 generates measurement data of the grounding system, data that can grasp the state of the grounding system, such as whether the connection state of the grounding system is good or not, and whether the function is normal or abnormal. In this case, the detected voltage value may be indicated as measurement data.

Thus, the connection state of the grounding system can be confirmed by detecting the voltage between the voltage line in the electric circuit and the protective grounding conductor.

FIG. 7 shows an explanatory diagram of the measurement performed by switching the pole (voltage line / neutral line) of the electric circuit.

In this case, when the connection part which electrically connects the voltage line and neutral line of the said electric circuit and a grounding system is provided and the judgment part judges the connection state of a grounding system, the electric circuit connected by the said connection part In addition, among the grounding systems, a connection state switching unit 365 that can selectively connect the voltage line and the grounding system or the neutral line and the grounding system is provided, and the measurement of FIG. 5 or FIG. 6 described above is selectively or merged. Perform measurement.

Reference numeral 365 denotes a connection state switching unit. The connection state switching unit 365 may be configured using a relay so as to selectively switch the connection between the voltage line and the neutral line, or a semiconductor that electronically selects a connection inside a microcomputer or IC. You may comprise with a switch.

The determination unit 364d determines the measurement shown in FIG. 6 when the voltage line is selected, and determines the measurement shown in FIG. 5 when the neutral line is selected. It is better to combine the functions to perform.

Furthermore, the determination unit 364d may be configured to combine the determinations of the measurements shown in FIGS. 6 and 5 described above in a combined manner on the electric circuit selected by the connection state switching unit 365.

Note that the measurement determination shown in FIG. 4 may be performed using the connection state switching unit 365.

As described above, the measurement data of various voltage values or current values necessary for making the determination by the determination unit 363d is sent to the connection state switching unit 365 for the voltage line and the ground system or the neutral line and the ground system. It can be obtained simply by selectively switching the connection.

In the environment where the grounding system is provided, grounding in various surrounding environments is predicted as described above. Therefore, when checking the connection state of the grounding system, the connection state of the grounding system can be determined by one measurement method. Assuming the case of checking and the case of combining various measurement methods in advance, it is not possible to check the connection status of the grounding system with one measurement method by providing a configuration to perform multiple measurements. Even in this case, it is possible to check the connection state appropriately by using other measurement methods.

FIG. 8 shows an explanatory diagram of the measurement performed by separating / connecting the grounding system.

FIG. 8 is interposed between a ground line connection terminal 6011 which is a terminal for connecting a ground line and a protective ground conductor connection terminal 6012 which is a terminal for connecting a protective ground conductor, and the protective ground conductor 107 and the ground line 106 are interposed. Switch means 370 is provided for separating / connecting to the ground, and the protective ground conductor 107 and the ground line 106 are controlled to be separated / connected by the switch means 370, thereby creating a ground state A and a non-ground state B. In each state of A and non-grounded state B, any one of the determinations shown in FIGS. 4 to 7 described above is performed, and the measured current values obtained in both the grounded state A and non-grounded state B or This is confirmed by comparing the measured voltage values.

First, based on the form of FIG. 4, a description will be given of a case where the switch means 370 is interposed between the protective ground conductor 107 and the ground line 106. The switch means 370 may use a relay circuit or an electronic switch configured using an IC or a microcomputer.

In this case, first, in a state where the switch means 370 is closed (ground state A), the power supply device 361 is connected to the neutral wire 102 and the protective ground conductor 107 on the load side of the electric circuit, and the voltage (the voltage is set to E) Apply. The current measuring means 162 measures the current flowing between the neutral wire 102 and the protective ground conductor 107 (current is I). Here, when the B type grounding and the D type grounding are performed, the combined resistance between the protective ground conductor 107 and the neutral wire 102 is R _Total = R as shown in (Equation 3). _Since it is expressed as _B + _RD , when voltage E is applied,
E / (R _B + R _D ) (Formula 4)
A current I expressed by the magnitude of is detected.

Subsequently, the same measurement is performed on the neutral wire 102 and the protective ground conductor 107 on the load side of the electric circuit with the switch means 370 opened (non-grounded state B). At this time, since the protective ground conductor 107 and the neutral wire 102 are separated by the switch means 370, the current I is not detected.

Here, when the determination unit 363e compares the current values obtained when the switch unit 370 is closed (grounding state A) and opened (non-grounding state B), the B type grounding and the D When seed grounding is performed, the detected current value I changes between the ground state A and the non-ground state B, and when the class B grounding and the class D grounding are not performed. Is the state in which the protective ground conductor 107 is not connected to the neutral wire 102 via the ground wire 106, the second electrical terminal 105, the ground 104, and the first electrical terminal 103. The current value I does not change between the ground state A and the non-ground state B.

Therefore, the determination unit 363e determines that the grounding system is connected when there is a change in the current value as a result of the comparison of the current values. If the current value is not changed as a result of the comparison of the current values, it is determined that the ground system is not connected.

Next, a description will be given of the case where the switch means 370 is interposed between the protective ground conductor 107 and the ground line 106 based on the above-described configuration of FIG.

In this case, first, the voltage between the neutral wire 102 and the protective ground conductor 107 on the load side of the electric circuit is measured with the switch means 370 closed (ground state A).

Here, when the B type grounding and the D type grounding are performed, the combined resistance between the protective ground conductor 107 and the neutral wire 102 is R _Total = R as shown in (Equation 3). _Since it is expressed as _B + R _D , the voltage between the neutral wire 102 and the protective ground conductor 107 simply corresponds to the voltage at the open end of the resistance circuit in which the combined resistor is interposed, and the neutral wire and voltage A measured voltage value of approximately zero volts is detected with respect to the line-to-line voltage.

Subsequently, the voltage between the neutral wire 102 and the protective ground conductor 107 on the load side of the electric circuit is measured with the switch means 401 opened (non-grounded state B).

In this case, since the protective ground conductor 107 and the voltage line 101 are separated by the switch means 370, the voltage is not stable. That is, the measured voltage value is not substantially equal to the line voltage between the neutral line and the voltage line.

Here, when the voltage values obtained when the switch means 370 is closed (grounding state A) and opened (non-grounding state B) are compared, the B type grounding and the D type grounding are performed. The detected voltage value E varies between the ground state A and the non-ground state B, and when the B-type ground and the D-type ground are not performed, the protective ground A conductor 107 is connected to the voltage line 101 side via the ground wire 106, the second electrical terminal 105, the ground 104, the first electrical terminal 103, the neutral wire 102, and the secondary winding of the transformer. Therefore, the voltage value E does not change between the ground state A and the non-ground state B.

Therefore, the determination unit 363e determines that the grounding system is connected when the voltage value is changed as a result of the comparison of the voltage values. If the voltage value is not changed as a result of the comparison of the voltage values, it is determined that the ground system is not connected.

Next, a case where the switch means 370 is interposed between the protective ground conductor 107 and the ground line 106 will be described based on the above-described embodiment of FIG.

In this case, first, the voltage between the voltage line 101 and the protective ground conductor 107 on the load side of the electric circuit is measured with the switch means 370 closed (ground state A).

Here, when the B type grounding and the D type grounding are performed, the combined resistance between the protective ground conductor 107 and the neutral wire 102 is Z _Total = R as shown in (Equation 5). _Since it is expressed as _B + R _D + Z _L , the voltage between the neutral wire 102 and the protective ground conductor 107 simply corresponds to the voltage at the open end of the resistor-coil series circuit in which the combined impedance is interposed, A measured voltage value approximately equal to the line voltage between the neutral line and the voltage line is detected.

Then, the voltage between the voltage line 101 and the protective ground conductor 107 on the load side of the electric circuit is measured with the switch means 370 opened (non-grounded state B).

In this case, since the protective ground conductor 107 and the voltage line 101 are separated by the switch means 370, the voltage is not stable. That is, the measured voltage value is not substantially equal to the line voltage between the neutral line and the voltage line.

Here, when the voltage values obtained when the switch means 370 is closed (grounding state A) and opened (non-grounding state B) are compared, the B type grounding and the D type grounding are performed. The detected voltage value E varies between the ground state A and the non-ground state B, and when the B-type ground and the D-type ground are not performed, the protective ground A conductor 107 is connected to the voltage line 101 side via the ground wire 106, the second electrical terminal 105, the ground 104, the first electrical terminal 103, the neutral wire 102, and the secondary winding of the transformer. Therefore, the voltage value E does not change between the ground state A and the non-ground state B.

Therefore, the determination unit 363e determines that the grounding system is connected when there is a change in the voltage value as a result of the comparison of the voltage values. If the voltage value is not changed as a result of the comparison of the voltage values, it is determined that the ground system is not connected.

Then, the determination result of the determination unit 363e and the measurement data of the grounding system are sent to the grounding system state data generation unit 320, and the measurement data of the grounding system and the connection state of the grounding system are determined appropriately and the function is normal. / Generate data that can grasp the status of the grounding system, such as abnormalities.

It should be noted that the above-described determination of the forms shown in FIGS. 4 to 7 is performed in combination, and is confirmed by comparing the measured current values or measured voltage values obtained in both the ground state A and the non-ground state B. You may comprise.

As described above, the voltage line or neutral line is connected to the ground system on the load side of the electric circuit, and the ground system state data indicating the connection state of the ground system is generated by the data generation unit, and the generated ground system state data is generated. A grounding system state data generating unit for transmitting the grounding system state data transmitted from the grounding system state data generating unit on the transformer side, and the received grounding system state data The grounding system connection status confirmation system is configured by providing an aggregation unit with a storage unit to hold the ground, so after the grounding work has been done, the work required to measure the grounding resistance can be reduced as much as possible. It is easy to know whether it is correct or not, and it is possible to quickly check and grasp the grounding system connection status confirmation system other than where the grounding work was done. It is possible to provide a beam.

Further, as shown in FIG. 9, these measurements are performed by connecting an electrical terminal 105 provided on the ground 104 via a grounding wire 106 electrically connected to the electrical terminal 105. When a plurality of protective grounding conductors 107 are connected to the centralized grounding terminal 108 provided, the grounding system connection state determination unit 360 and the centralized grounding terminal 108 are electrically connected to the protective grounding conductor. Instead, various measurements may be performed on the concentrated ground terminal.

The centralized grounding terminal 108 is provided for the purpose of sharing the grounding wire 106 electrically connected to the second electrical terminal 105 when a plurality of the protective grounding conductors 107 for grounding devices are provided. This is for collectively connecting the protective grounding conductors 107.

When a plurality of protective grounding conductors are provided by performing a series of determinations on the concentrated grounding terminal 108 instead of the protective grounding conductor 107 in the embodiment shown in FIGS. This is effective in that the grounding state for all the protective grounding conductors 107 can be confirmed with a single determination without making judgments for each of the protective grounding conductors 107 one by one.

The grounding system state data generation unit 300 shown in the present embodiment is provided in a distribution board or relay box into which a grounding wire or a protective grounding conductor that is a grounding system is provided. Can be conveniently performed.

(Second embodiment)
Subsequently, the second embodiment will be described with reference to FIG.

FIG. 10 shows a form in which the aggregated data generated by the aggregation unit 400 is stored in a server connected to the Internet via the Internet network. Note that description of parts similar to those of the first embodiment is omitted.

Aggregation unit 400 is connected to an aggregate data generation unit, and is provided with a communication unit for transmitting aggregate data to server 500 via Internet network 501. The connection with the Internet network 501 uses a wireless LAN type communication device as described above.

Since the communication unit has a communication distance of about several hundred meters, a gateway for Internet connection is provided in the vicinity to perform wireless communication. As this gateway, it is good also as a form which uses the office of a surrounding, or a household gateway. In addition, communication may be performed using a gateway disposed at an appropriate interval on a utility pole or the like.

Further, the aggregation unit 400 may be configured by providing a communication means using a mobile phone or PHS, for example, a communication device having a modem function. When the aggregated data is transmitted to the server, it communicates by dial-up connection to an access point provided by an Internet connection provider.

Further, the grounding system state data generation unit 300 is connected to the grounding system state data generation unit, and is provided with a wireless LAN format, a communication device using a mobile phone or a PHS, for example, a communication device having a modem function, and an aggregation unit. The ground system status data may be transmitted to the server, and the ground system status data generation unit 300 may transmit the ground system status data to the server via the Internet network. In this case, the grounding system state data generation unit 300 is provided with a storage unit configured using a memory for storing the grounding system state data so as to store the grounding system state data temporarily or permanently. May be.

Even when one of the communication units of the aggregation unit 400 or the ground system state data generation unit 300 fails when the ground system state check system transmits the ground system state data to the server, The ground system status data can be transmitted to the server. Since the grounding system is an important element for electrical security, it is possible to communicate with higher certainty when grasping the state of the grounding system.

The aggregated data or grounding system state data transmitted to the server 500 is stored in the server, is subjected to arithmetic processing, and is stored together with measurement date data and identification data.

Various stored data can be viewed by managers and workers who need these data, for example, power companies, security companies, and contractors of grounding systems. When the status of the grounding system is not good quickly by referring to which aggregation unit the data aggregated and which grounding system status data generation unit generated the data, etc. It is also possible to grasp when the grounding work needs to be improved.

In addition, notification destination data may be registered in the server 500 in advance, and when the accumulated grounding system state data is in a predetermined state, the predetermined notification destination data may be contacted. As a result, the manager and the operator can grasp the abnormality of the state of the grounding system more quickly. Specifically, email addresses and telephone numbers are registered, and when the grounding system is in a poor state, the program automatically performs mail and telephone calls to ensure the security of electricity. Can keep.

In addition, regarding the generation of the periodic grounding system state data described above, since the aggregated data is transmitted to the server side, the measurement frequency may be determined without depending on the memory capacity of the storage unit 450.

(Third embodiment)
FIG. 11 shows a third embodiment.

In the third embodiment, when a plurality of grounding system state data generation units are connected to the aggregation unit 400, the state of each grounding system is grasped.

When n grounding system state data generation units 300a, 300b,..., 300n are connected on the load side of the electric circuit, each grounding system state data generation unit has an identification data storage unit as described above. Is added to the grounding system state data and transmitted to the aggregation unit 400.

Aggregation unit 400 aggregates ground system state data for each identification data by the aggregate data generation unit. Then, the ground system status data is displayed on the display unit for each identification data.

Each aggregated data is transmitted to the server, and the server accumulates the transmitted aggregated data.

Assuming that a plurality of aggregation units 400 are provided, an identification data storage unit 450 may be provided in the aggregation unit.

As described above, even when there are a plurality of grounding system state data generation units and aggregation units, the identification system is added and data processing is performed. Can grasp.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIGS.

In the fourth embodiment, the grounding system state data generation unit 300 is configured to generate grounding system state data in response to a trigger signal from the outside. The aggregation unit 400 is also configured to generate aggregate data upon receiving a trigger signal from the outside. The trigger signal may be transmitted from the aggregation unit toward the ground system state data generation unit, or may be transmitted from the server 500 toward the ground system state data generation unit 300 or the aggregation unit 400.

FIG. 12 shows the grounding system state data generation unit 300. Instead of the transmission unit 310 of the grounding system state data generation unit shown in FIG. 2, a transmission / reception unit is provided as a trigger signal reception unit. FIG. 13 shows the aggregation unit 400. Instead of the receiving unit 410 of the aggregation unit shown in FIG. 3, a transmission / reception unit is provided as a trigger signal receiving unit.

First, a case where a trigger signal is transmitted from the aggregation unit 400 toward the grounding system state data generation unit 300 will be described.

The aggregated data generation unit 420 of the aggregation unit 400 transmits a trigger signal from the transmission / reception unit 410 to the ground system state data generation unit 300 when generating aggregated data. The trigger signal is composed of a predetermined data series, and when the predetermined data series is received on the ground system state data generation unit 300 side, the ground system state data generation unit generates the ground system state data. 320 stores program data in advance.

The grounding system state data generation unit 300 that has received the trigger signal newly measures the grounding system state by the grounding system state measurement unit 360, generates the grounding system state data by the grounding system state data generation unit 320, The ground system state data is transmitted from the transmission / reception unit 310 to the aggregation unit 400.

When the trigger signal is transmitted from the aggregation unit 400, identification data for identifying the ground system state data generation unit is added and the trigger signal is transmitted. As a result, even when there are a plurality of ground system state data generation units and the trigger signal reaches a plurality of ground system state data generation units, to which ground system state data generation unit the trigger signal is transmitted is determined. It becomes clear, and the grounding system state data generation unit that has received the trigger signal generates grounding system state data when identification data addressed to itself is included. In other words, if the identification data addressed to itself is not included, the program processing may be performed so that the trigger signal is ignored.

Subsequently, a case where a trigger signal is transmitted from the server toward the grounding system state data generation unit 300 will be described.

When the server 500 collects ground system state data, it adds identification data for identifying the ground system state data generation unit 300 that performs communication via the Internet network, and then a trigger composed of a predetermined data series. Send a signal. When the ground system state data generation unit 300 receives the trigger signal, the ground system state data is newly generated by referring to the identification data and when the trigger signal is addressed to itself. Then, the ground system status data is transmitted to the server 500. Note that, when a trigger signal is received from the server 500, the grounding system state data may be transmitted to the aggregation unit 400.

When communicating with a specific ground system status data generation unit via the Internet,
Configuration using identification method using IPv6 address system, or in the case of IPv4 format, using DNS, routing, port mapping, etc. to communicate with specific ground system status data generation unit Good.

The same applies to the case where a trigger signal is transmitted from the server 500 toward the aggregation unit 400.

When collecting the aggregated data, the server 500 adds identification data for identifying the aggregated unit 400 that performs communication via the Internet network, and then transmits a trigger signal composed of a predetermined data series. When the aggregation unit 400 receives the trigger signal, it refers to the identification data, and when it is a trigger signal addressed to itself, it newly aggregates ground system state data. Then, the aggregated data is transmitted to the server 500. Note that, when a trigger signal is received from the server 500, the aggregation signal may be transmitted from the aggregation unit 400 to the ground system state data generation unit 300 to generate ground system state data.

In addition, a trigger signal is transmitted from the computer terminal of the administrator or worker who needs these data to the server 500, and the server 500 that has received the trigger signal collects the ground system state data generation unit 300 or the aggregated data. By transmitting a trigger signal to the unit 400, it may be configured to generate ground system state data or aggregate data. As a result, the manager or operator can obtain and grasp the grounding system status data or aggregated data when necessary, and if the grounding system status is not good or the grounding work needs to be improved. Can grasp the case.

The administrator or the operator accesses a homepage provided on the server by using a computer terminal, and refers to the grounding system state data generated by the predetermined grounding system state data generation unit or the aggregation unit. It may be configured. In addition, a trigger signal transmission button (link) corresponding to an individual ground system status data generation unit or aggregation unit is created on the homepage, and if necessary, the trigger signal transmission button (link) is operated. Thus, after adding identification data, a trigger signal may be transmitted to a predetermined grounding system state data generation unit or aggregation unit.

In addition, latitude / longitude data is added to each area and place where the ground system status data generation unit and aggregation unit are provided, and the identification data, ground system status data, aggregate data, date data, latitude / longitude data are associated with each other. The data may be stored in a storage unit or a server, and the server may perform a program process so that the data is aggregated and displayed in a list for each grounding system state data generation unit or aggregation unit.

Further, by accessing the server from a computer terminal used by an administrator or an operator, the server reads the identification data, grounding system state data, aggregated data, date data, latitude / longitude data, etc. stored in the server, The map data and the point data obtained from the latitude / longitude data may be superimposed and displayed on the display screen of the computer terminal so that the grounding system state data or the aggregated data can be visually viewed.

In this way, after the grounding work has been carried out, the labor required to measure the grounding resistance can be reduced as much as possible, and whether the grounding system is functioning normally over time, It is possible to quickly confirm and grasp even outside the designated place.

It should be noted that the present invention is not limited to the above-described embodiment, and can be appropriately applied as necessary without departing from the gist of the invention.

For example, in the grounding system state measuring unit 360, in order to confirm in more detail whether or not the grounding system is in a normally functioning state, the state in which the B type grounding and the D type grounding are normally performed is performed. When the measurement current value and the measurement voltage value shown in the above-described embodiment in the basic state are stored in the storage unit as basic data and the measurement is repeated over time, By comparing the measured current value and the measured voltage value data with the basic data at the judgment unit, it is determined whether there is any deviation from the normal state, and the magnitude of the deviation is a predetermined magnitude. In such a case, it may be determined that the grounding state is not functioning normally.

In addition, as the basic data stored in the storage unit, resistance value data in the grounding system is actually obtained, and the measurement current value and the measurement voltage value obtained as a result of repeating the determination over time are obtained. It may be configured to obtain resistance value data from the data, and to determine that the grounding state is not functioning normally when the difference between the respective resistance value data becomes a predetermined magnitude.

Further, the resistance value data obtained from the ground data obtained from the basic data and the measured current value and the measured voltage value data obtained as a result of repeating the measurement over time are the above-described resistance value data. For example, it is judged by the judging section whether or not the ground resistance value is within 100Ω in the case of class D grounding work described in the technical standards for the electrical equipment. May be configured to determine that is not functioning properly.

The external computer terminal may be a general mobile phone that can be connected to the Internet or a computer, or may be a dedicated data processing device that stores the various data described above, performs arithmetic processing, and displays the data.

In addition, the measured ground system status data is notified not only to the administrator and the operator but also to the resident in the place where the ground system status data generation unit 300 is installed, or the ground system status data is generated. By displaying on a display unit provided in the unit, the resident may be made aware that the state of the grounding system is not appropriate. This makes it possible for residents to clearly understand the status of the grounding system. If the status of the grounding system is not appropriate, contact the administrator or worker to help maintain the electrical safety. Can do.

Furthermore, by obtaining secular data and changes in each region from the obtained grounding state data, it is also possible to determine how the grounding state has changed in each region over time. If the specified grounding resistance value is exceeded, or if the specified grounding resistance value is likely to be exceeded, for example, the grounding state in the area concerned is intensively checked and the grounding state becomes normal in advance. Improvements can be made.

Further, the grounding system state data generation unit 300 is connected to the grounding system state data generation unit to provide a notification unit, and the basic data described above, the measurement current value obtained by repeating the determination over time, and the measurement If the voltage value data, the resistance value data obtained from these data, or the data such as whether the grounding state is normal exceed a predetermined value or greatly deviate, The notification unit may notify that the grounding state is not normal so that the grounding state can be confirmed in the surroundings.

The sound data to be notified may be stored in advance in the microcomputer by providing a sound microcomputer or the like in the ground system state data generation unit. Or you may comprise so that audio | voice data may be transmitted to the microcomputer of the said earthing | grounding system state data generation unit via the internet network, and this audio | voice data may be notified from the said alerting | reporting part.

The present invention can be applied to a grounding system connection state confirmation system for confirming the state of a grounding system to which a grounding wire or a protective grounding conductor in the grounding system is connected. It is mainly useful for checking the connection status of the grounding system in the distribution board that houses various power distribution devices and for checking the connection status of the grounding system in the dedicated ground box. The distribution board can be applied to residential distribution boards as well as industrial distribution boards, so that the state of grounding can be controlled against grounding in various locations, whether residential or industrial. There is a possibility that a grounding system connection state confirmation system can be provided.

Explanatory drawing of the ground wire branch terminal according to the first embodiment Explanatory drawing of the ground system status data generation unit Illustration of aggregation unit Explanatory drawing of the measurement of the ground system status measurement unit Explanatory drawing of the measurement of the ground system status measurement unit Explanatory drawing of the measurement of the ground system status measurement unit Explanatory drawing of the measurement of the ground system status measurement unit Explanatory drawing of the measurement of the ground system status measurement unit Explanatory drawing of the measurement of the ground system status measurement unit Explanatory drawing of the ground wire branch terminal according to the second embodiment Explanatory drawing of the ground wire branch terminal according to the third embodiment Explanatory drawing of the earthing | grounding system state data generation unit concerning 4th Embodiment Explanatory drawing of the aggregation unit according to the fourth embodiment Illustration of ground voltage and ground resistance when insulation of load equipment installed in electric circuit deteriorates

DESCRIPTION OF SYMBOLS 1 Grounding system connection state confirmation system 100 Transformer 101 Voltage line 102 Neutral line 103 1st electrical terminal 104 Ground 105 2nd electrical terminal 106 Grounding line 107 Protective ground conductor 300 Grounding system state data generation unit 310 Transmission part 320 Ground system state data generation unit 340 Display unit 350 Identification data storage unit 360 Ground system state measurement unit 362 Current measurement unit 363 Determination unit 364 Voltage measurement unit 365 Connection state switching unit 366 Display data generation unit 307 Display unit 370 Switch unit 6011 Ground Line connection terminal 6012 Protective ground conductor connection terminal 400 Aggregation unit 410 Reception unit 420 Aggregation data generation unit 440 Display unit 450 Storage unit 500 Server 501 Internet network

Claims (4)

The neutral wire side of the secondary winding of the transformer intervening in the electric circuit is grounded by providing a first electrical terminal on the ground,
In the load-side electric circuit of the transformer, the second electrical terminal provided on the ground performs D-type grounding of equipment and the like through a grounding wire electrically connected to the second electrical terminal. In an electric circuit having a grounding system configured by being electrically connected to a protective grounding conductor,
In the load side electric circuit of the transformer,
A voltage line or a neutral line of the secondary winding of the transformer, and a connection part connected to the grounding system;
A voltage application unit for applying a voltage between the electric circuit connected by the connection unit and the grounding system;
A current detection unit for detecting a current flowing between the electric circuit and the ground system by a voltage applied by the voltage application unit;
A determination unit that determines that the grounding system is connected when current is detected by the current detection unit, and determines that the grounding system is not connected when the current is not detected. When,
A data generation unit for generating grounding system state data indicating a connection state of the grounding system from a determination result by the determination unit and measurement data;
A grounding system state data generation unit including a transmission unit for transmitting the generated grounding system state data;
On the transformer side of the load side circuit, a receiving unit that receives the ground system state data transmitted from the ground system state data generation unit, an aggregate data generation unit that aggregates the received ground system state data, and An aggregation unit having a storage unit for holding the aggregated data,
While allowing the grounding system status data to be held in the aggregation unit,
The aggregation unit further includes a transmission unit that transmits the aggregated data to a server provided outside the grounding system;
It has a display unit that displays grounding system status data or aggregated data so that it can be seen from the outside of the aggregated unit,
The grounding system state data generation unit further includes a storage unit that stores identification data for specifying a communication source when communicating with the aggregation unit or the server,
When communicating the ground system status data obtained by the ground system status data generation unit using the identification data, the communication source is specified and transmitted to the server,
Grounding system connection status confirmation system adapted grounding system state data is displayed on the display unit of the grounding system state data generating unit.
The grounding system state data generation unit further includes a display unit for displaying the grounding system state data so as to be visible from the outside of the grounding system state data generation unit;
A storage unit for holding the grounding system state data;
A read processing unit that reads out the grounding system state data held in the storage unit, and a transmission unit that transmits the grounding system state data to a server provided outside the grounding system,
2. The ground system connection according to claim 1, wherein ground system state data is displayed on the display unit and ground system state data obtained by the ground system state data generation unit is transmitted to the server. Status confirmation system.
The ground system state data generation unit further includes a trigger signal reception unit that receives a trigger signal for newly generating ground system state data at the data generation unit, and when the trigger signal is received at the trigger signal reception unit The grounding system connection state confirmation system according to claim 1 or 2, wherein the grounding system state data is generated and the grounding system state data is transmitted to the aggregation unit or the server.
The aggregation unit further includes a trigger signal receiving unit that receives a trigger signal that newly aggregates ground system state data in the aggregated data generation unit, and when the trigger signal is received by the trigger signal receiving unit, The ground system connection state according to any one of claims 1 to 3, wherein the ground system state data is aggregated to generate aggregate data, and the aggregate data is transmitted to a server. Confirmation system.

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