JPH11271376A - Protecting relay control circuit testing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously operate plural tests by integrating insulating resistance measurement and circuit measuring function and relay measurement for a switcher and a relay in one testing device, and connecting this through a connector device for testing with a testing device measuring function. SOLUTION: A ZCT(zero current transformer)4, ZPD(zero reference inputting device)5, and trip circuit 6 are arranged in a switcher 3, and this is connected with a DGR(ground directional relay) 7, and a connector device 8 for testing is provided with each exclusive terminal for each outputting means. A voltage outputting part 11, trip circuit resistance measuring part 12, insulating resistance measuring part 13, current outputting part 14, and trip voltage detecting part 15 are arranged in a testing device 10 connected with the connector device for testing, and each means is operated by an operating part 20, and displayed on a display member 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trip type high voltage AC load switch and a ground fault relay or a ground fault direction relay installed near a demarcation point of high voltage power receiving in a private power receiving facility or the like. The present invention relates to a protective relay control circuit test device used for annual inspection.

[0002]

2. Description of the Related Art In private power receiving equipment and the like, a low-voltage power path is connected to a high-voltage path via a transformer or the like, and a low-voltage power supply path for supplying power to each demand unit is provided. In the high-voltage path, a trip type high-voltage AC load switch (hereinafter referred to as "switch") and a ground fault relay or a ground fault directional relay (hereinafter referred to as "relay") are arranged near a demarcation point for high-voltage power reception. It is composed. For example, in the example of the zero-phase current transformer 4 configured as shown in FIG.
A zero-phase current transformer 4 is arranged between the zero-phase current transformer 4 and the load 2 to obtain information on the zero-phase current of the high-voltage circuit at the installation point. Means for detecting the state of insulation deterioration, automatically operating the main contact 3a, automatically stopping power supply, and preventing an electrical accident from occurring can be used.

In the zero-phase current transformer 4, a test of a ground fault relay can be easily performed by simulating an equivalent zero-phase current through a Kt-Lt terminal as a test circuit. Is configured. Furthermore, a zero-phase reference input device 5 arranged when a ground fault directional relay is used.
Is configured as shown in FIG. 1 and FIG. That is, in the switch 3 that connects the high-voltage distribution system 1 and the load 2, the capacitors Cd1 to Cd3 and Cd4 for ground voltage division are provided near the switch for each of the high-voltage paths R, S, and T. Terminals Y1 and Y1 for transmitting a zero-phase voltage signal to a relay on the secondary side of the transformer 9a.
2 are provided.

[0004] By connecting the input terminals of a relay such as a ground fault directional relay to the terminals Y1 and Y2,
A signal of the magnitude and phase of the zero-sequence voltage in the high piezoelectric path can be obtained. Further, in the zero-phase reference input device 9, the relay voltage is simulated by simulating the application of Vo to the primary terminal of the device via a terminal T1 as a Vo (zero-sequence voltage) test terminal. Is configured to be easily performed. The private power receiving equipment is required to undergo an annual inspection, and the following test items are performed.

A: Measurement of insulation resistance of switch trip circuit Switches are often installed outdoors, and in order to ascertain insulation deterioration due to flooding, rusting, etc., the insulation resistance meter of the switch trip circuit is used to measure ground resistance. The insulation resistance between them is measured.

B: DC resistance measurement of the trip circuit of the switch The switch has a function of applying a trip voltage of the relay to the trip circuit of the switch and automatically shutting off the switch when a ground fault operation of the relay occurs. is there. If the trip circuit of the switch is normal, there is a DC resistance of about several tens Ω to several hundred Ω, and the DC resistance of the trip circuit is measured by the DC resistance range of the tester to judge the quality of the trip circuit.

C: Trip voltage measurement of relay When the relay operates normally by a test button or the like, a DC or AC voltage (hereinafter referred to as "trip voltage") for opening the main contact of the switch is output from the relay, If the relay is defective, no trip voltage is output. The trip voltage is measured and measured using the voltage range of the tester in order to determine the quality of the relay. In addition,
To avoid accidental opening of the switch during uninterrupted power testing,
Separate the trip voltage output terminal of the relay and the trip circuit of the switch.

D: Measurement of the operating time of the ground fault relay In the test circuit (Kt-Lt circuit) of the zero-phase current transformer (hereinafter referred to as "ZCT") of the switch, the same AC test current as the commercial frequency exceeding the rectified current value is applied. (Generally 130 to 4 of the settling current value)
00%), and whether or not a ground fault relay (hereinafter, referred to as “GR”) connected to the ZCT operates within a predetermined time is performed by a relay tester. In the case of a ground fault directional relay (hereinafter, referred to as “DGR”) test, an AC test current is applied, and at the same time, a zero-phase voltage (hereinafter, referred to as “Vo”).
A commercial frequency voltage exceeding the settling voltage value (generally 150% of the settling voltage value) is applied to a Vo test terminal (a ZPD primary terminal in the case of a unit test) of a zero-phase reference input device (hereinafter referred to as “ZPD”).

[0009]

However, the above a to d
When performing each test as described in, it is necessary to use different test equipment for each test item, and it is very complicated to perform the test while changing the connection of each test equipment. There is a problem that forced work is required. Also,
When performing each of the above tests sequentially, if the test procedure is erroneous, there is a danger that the power supply circuit as a DUT may be short-circuited or the measuring instrument may be burned out. There is.

In other words, when the conventional test method is employed, it is necessary to prepare a large number of measuring instruments, so that various kinds of measuring instruments are prepared, a task for confirming the test, and after the test. It takes a lot of time for the removal work. In addition, every time a test item is changed, it is necessary to change the measuring instrument and the connection, which is complicated and time-consuming, and inconveniences such as incorrect connection may cause electric shock or burning of the DUT. Or other problems. Furthermore, when performing an uninterruptible power test, there is a danger of a total power failure due to switch malfunction due to, for example, forgetting to remove the switch trip circuit.

The present invention solves the above-mentioned problem in the case of using the conventional test method. A plurality of test functions are integrated into one apparatus so that a test operation can be performed safely and in a short time. It is intended to provide a device.

[0012]

SUMMARY OF THE INVENTION The present invention relates to an electrical installation in which a switch is disposed near a demarcation point for high-voltage power reception. According to a first aspect of the present invention, a main contact and a zero-phase current transformer, and a trip circuit and a zero-phase reference input device are arranged in a switch, the switch is connected to a relay, and the zero-phase current transformer is connected to the switch. Each of the trip circuit, the zero-phase reference input device, and the relay circuit is connected to a connector provided on one test connector device, and the test device connected via the test connector device includes a measuring unit, an operation unit, and A display member is arranged, and the measuring means, the operation unit, and the display member are configured as one unit.

According to a second aspect of the present invention, the measuring means provided in the test apparatus includes a voltage output section, a trip circuit resistance measurement section, an insulation resistance measurement section, a current output section and a trip voltage detection section. By combining any of the measuring means, three types of test functions of an insulation resistance meter function, a circuit meter function, and a relay test function can be exhibited. The invention according to claim 3 is the switch Z in an uninterrupted state by the current output unit provided in the test apparatus.
It is characterized in that it is configured to be compatible with the CT function test. According to a fourth aspect of the present invention, a peak hold circuit, a time counter circuit, and a counter stop circuit are arranged in correspondence with the trip voltage detecting section arranged in the test apparatus, and the operation time and the trip voltage can be measured in one test. It is characterized by the following. According to a fifth aspect of the present invention, in the test connector device for connecting the switch and the test device, a dedicated connector is arranged corresponding to a terminal connected to a measuring means arranged in the test device. It is characterized by.

With the configuration described above, in the protection relay control circuit test apparatus of the present invention, the output terminals are collectively arranged on the test connector device for each of the measuring units provided in the switch. Since all the measurement terminals of the test device are connected via the test connector device and the measurement operation is performed using the operation unit provided in the test device, various data for the switch and the relay are transmitted. Can be easily obtained. Further, in the test apparatus, since a large number of measuring means are incorporated as a unit in one test apparatus, required data can be easily obtained by using the operation unit. By providing a voltage measurement function with peak hold and performing a stop operation of the counter using the trip voltage, the operation time and trip voltage can be measured in a single test, and the test for the DGR can be performed with a voltage. This can be performed using the function of the output unit.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A protection relay control circuit test apparatus according to the present invention will be described with reference to the illustrated example. In the example shown in FIG. 1, a high-voltage path 1 on the power distribution system side is connected to a high-voltage path 2 on the private side by using a switch 3 provided with a main contact 3a to form a path for supplying power to a load device. It is related to private power receiving equipment. In FIG. 1, a ZCT 4 is disposed on the high-voltage path 1 side in the switch 3, a ZPD 5 is disposed on the high-voltage path 2 side, and a trip circuit 6 is provided. The ZCT4 and ZPD5 are connected to a DGR7, and the DGR7 is grounded via a ground terminal E.

The output circuit of each mechanism can be connected to each mechanism of a test device described later via each of the terminal groups 8a to 8d provided on the test connector 8. In the terminal provided on the test connector 8, a terminal 8a
ZPD5, terminal 8b a trip circuit 6, ZC
The test circuit of T4 is connected to the terminal 8c and the trip voltage output terminal 8d of the DGR 7 respectively. In a test device connected via a plurality of terminals provided in the test connector device, each test section is connected to an arbitrary terminal of the test connector 8 in accordance with an item to be tested. To collect necessary data.

The plurality of terminals 8a to 8d arranged on the test connector device 8 are configured as dedicated connectors so that different connectors cannot be mounted, thereby preventing erroneous connection. The T wiring for the Kt, Lt and Vo test terminals of ZCT4 is DG
R7 are connected to spare terminals Kt, Lt, and T, respectively. In addition, except during the test, the trip circuit of the switch
It is connected to the trip signal output terminals Va and Vc of the DGR.

In a test apparatus 10 connected to the switch 3 and the DGR 7 via a test connector device, a voltage output section 11 connected to a terminal 8a and a trip circuit resistance measuring section connected to a terminal 8b. 12, an insulation resistance measuring unit 13, a current output unit 14 connected to the terminal 8c, and
A trip voltage detector 15 connected to the terminal 8d is arranged. Each of the voltage output unit 11, the trip circuit resistance measurement unit 12, and the insulation resistance measurement unit 13 is operated via the operation unit 20, and can be displayed on the measurement data display unit 21. The current output unit 14 is connected to the test terminal Kt-Lt of the switch ZCT4 to output an AC test current and to output the AC test current.
Is used as a start signal and the time counter circuit 16
Activate

A trip voltage detector 15 is connected to the trip voltage output terminal of the DGR 7, and a relay operation signal is output from the circuit 15 to a counter stop circuit 17 and a stop signal to a time counter circuit 16 is output. . Further, the circuit 15 outputs trip voltage information to the peak hold circuit 18, and the circuit 1
The operations of 7 and 18 are performed based on the information set in the operation unit 20, and the measurement results are displayed on the display unit 21.

In the embodiment shown in FIG. 1, the respective components arranged in the switch and the test apparatus have the following configuration, and are configured to perform the following operations. ZCT4 is the ZC at the ZCT installation point.
A device for measuring the T primary current, which is provided with a test terminal Kt-Lt. The trip circuit 6 is a trip device for a switch, and is constituted by a trip coil, a pallet switch, and the like. The trip circuit 6 is excited by a trip signal from a relay and functions to automatically open the main contact 3a.

The ZPD 5 detects the zero-sequence voltage of the high-voltage path connected to the primary terminal of the ZPD. The ZPD is provided with a Vo test terminal (T1 terminal) as shown in FIG. Apply test voltage to Vo test terminal to
By simulating Vo application equivalently to the D primary terminal,
A relay test can be easily performed. Voltage output unit 11
Is a DGR test AC voltage generation circuit that applies a test voltage between the ZPD primary terminal and the ground. This circuit has a test voltage switching function.

The trip circuit resistance measurement section 12 and the insulation resistance measurement section 13 measure the DC resistance of the trip circuit by the trip circuit resistance measurement operation, and measure the insulation resistance between the trip circuit and the ground by the insulation resistance measurement operation. The current output unit 14 is an AC current generation circuit for testing GR or DGR7. The current output unit 14 supplies a test current to a ZCT test terminal (between Kt and Lt) by a relay operation time measuring operation, and simultaneously outputs a start signal to the time counter 16. Send out. It has a current switching function to perform an operation time characteristic test when the test current value is changed.

Trip voltage detection, auxiliary contact operation detection section 1
5 detects the trip voltage during the operation of the relay and sends a signal to the peak hold circuit 18. In addition, the trip voltage at the time of the relay operation or the auxiliary contact operation of the relay is detected,
Sends a signal to the counter stop circuit. The counter stop circuit 17 sends a stop signal to the time counter circuit 16 in response to a signal from the trip voltage detection and auxiliary contact operation detection circuit. Measure the relay operating time until the switch operates. The peak hold circuit 18
Because the trip voltage during relay operation often attenuates gradually, the maximum value of the voltage signal from the trip voltage detection circuit is held and displayed, thereby displaying the maximum value of the trip voltage during relay operation. do. Further, it is configured to include a reset circuit. Further, the operation unit 20 and the display unit 21 display the operation at the time of various tests, data such as a voltage value, an operation time, or the operation state of the apparatus.

In the test apparatus 10 in which the above circuits are combined as one apparatus, the test apparatus 10 is configured as an apparatus having the following test functions to improve the efficiency of test work and improve safety. Insulation resistance measurement function of switch trip circuit: A DC voltage is applied between the trip circuit 6 of the switch 3 and the ground, and the insulation resistance between the ground is measured from the current flowing between the ground. DC resistance measurement function of switch trip circuit: By using the double integration method or by passing a constant current from the constant current circuit to the trip circuit 6 of the switch 3 and converting the resistance value from the DC voltage between the trip circuit terminals. Measure the DC resistance of the trip circuit. Trip voltage measurement function during relay operation: A peak hold circuit that measures the trip voltage during relay operation and maintains a maximum voltage output voltage is provided by a double integration method, a DC-DC converter, or the like. When the absolute value of the voltage is displayed by this circuit, the circuit has an automatic inversion function for the DC output.

Relay operation time measurement function: This function has a function of flowing a test AC current and a function of measuring the time from when the test current starts flowing until the relay operates, and the following functions a and b Have. a AC test current generation circuit and test voltage generation circuit:
A test AC current equal to the commercial frequency is generated by an AC constant current generation circuit or a combination of a single-turn voltage regulator (Slidac) and a resistor. The AC voltage generator required for the simple test of the earth fault directional relay generates the same AC test voltage as the commercial frequency by using a constant voltage generator or a combination of a single-turn voltage regulator and a resistor. I do. The output voltage has a certain phase relationship, such as the same phase or the opposite phase, with respect to the current phase of the current output unit. b Measurement of operating time: The moment the test current is applied, the time counter is started, the trip voltage during the operation of the relay or the auxiliary contact operation of the relay is detected, the time counter is stopped, and the operation time of the relay is measured.

[0026]

Since the protection relay control circuit test apparatus of the present invention is constructed as described above, an output terminal is connected to a test connector for each measurement value output section provided in the switch. It is arranged in the device collectively, all the measurement terminals of the test device are connected via the test connector device, and the measurement work is performed using the operation unit provided in the test device. Various data for the relay and the relay can be easily obtained. Further, in the test apparatus, since a large number of measuring means are incorporated as a unit in one test apparatus, necessary data can be easily performed using the operation unit. By providing a voltage measurement function with peak hold and performing a stop operation of the counter using the trip voltage, the operation time and trip voltage can be measured in a single test, and the test for the DGR can be performed with a voltage. This can be performed using the function of the output unit.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of information output means arranged in a switch of the present invention.

FIG. 2 is a circuit diagram of a test apparatus connected to the output means of FIG. 1 using a test connector device.

FIG. 3 is an explanatory diagram of a configuration example of a general zero-phase reference input device.

[Explanation of symbols]

1 High-voltage circuit, 2 Load-side circuit, 3 Switch, 4 ZCT, 5 ZPD, 6 Trip circuit, 7 DGR, 8 Test connector device,
10 Test equipment, 11 Voltage output part, 12 Trip circuit resistance measurement part, 13 Insulation resistance measurement part, 1
4 Current output section, 15 Trip voltage detection section, 1
6 time counter circuit, 17 counter stop circuit, 18 peak hold circuit, 20 operation section,
21 Display member.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyuki Oikawa 1-1-48 Ogimachi, Miyagino-ku, Sendai, Miyagi Prefecture Inside the Tohoku Electric Safety Association

Claims (5)

[Claims] 1. An electrical installation having a switch near a demarcation point for high-voltage power reception, comprising: a main contact for opening and closing a high-voltage path, a zero-phase current transformer and a trip circuit; A reference input device is disposed, and the switch and the ground fault relay or a ground fault direction relay are connected to each other, and each of the zero-phase current transformer, the trip circuit, the zero-phase reference input device, and the ground fault direction relay circuit is connected. A test device connected to a connector provided on one test connector device, and a measuring device, an operation unit, and a display member arranged on the test device connected via the test connector device; As a single unit. 2. A measurement device provided in the test apparatus, comprising: a voltage output unit, a trip circuit resistance measurement unit, and an insulation resistance measurement unit;
Composed of a current output section and a trip voltage detection section, and by combining any of the above-mentioned measuring means, it is possible to exhibit three kinds of test functions of an insulation resistance meter function, a circuit meter function and a relay test function. 2. The protection relay control circuit test apparatus according to claim 1, wherein: 3. The protection relay control according to claim 2, wherein a current output unit provided in said test apparatus is adapted to be able to respond to a test of a switch zero-phase current transformer function without interruption. Circuit test equipment. 4. A peak hold circuit, a time counter circuit, and a counter stop circuit are arranged in correspondence with a trip voltage detecting section arranged in the test apparatus, and control of a relay operating time and measurement of a trip voltage are performed in a single test. 4. The protection relay control circuit test apparatus according to claim 1, wherein the protection relay control circuit test apparatus is enabled. 5. A test connector device for connecting the switch and a test device, wherein a dedicated connector is arranged corresponding to a terminal connected to a measuring means arranged in the test device. The protection relay control circuit test apparatus according to any one of claims 1 to 4, wherein