JPH0933588A - Tester for protective repeater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a measurement data of a protective repeater easily with limited measuring errors. SOLUTION: A test data for testing static characteristics is stored by a memory function of a 8 phase voltage/current generator 12 and a voltage and a current are generated by a test starting command to be applied to a sample repeater 15 after amplified by a distortion-free tester 13. When the sample repeater 15 is operated, a repeater operation signal thereof is applied to the 8 phase voltage/current generator 12 to hold the voltage and current at the moment. The values of the voltage and the current are measured by a measuring device 14 and a measurement data thereof is transferred to a personal computer 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test device used for a unit test or a simulated failure test of a protective relay.

[0002]

2. Description of the Related Art Conventionally, as a test device for performing a characteristic test of a protective relay, as shown in FIG. 4, a personal computer (hereinafter simply referred to as a personal computer) 1, a voltage / current generator 2, and an amplifier 3 are used. There is.

The personal computer 1 outputs test data such as voltage, current, frequency and electrical angle for testing the characteristics of the test relay 4 which is programmed in advance. The voltage / current generator 2 is the personal computer 1. The voltage or current is generated based on the test data input from.

The amplifier 3 amplifies the voltage or current input from the voltage / current generator 2 based on a preset gain and outputs it to the test relay 4. Next, in the protective relay test device as described above,
For example, a case of testing an overvoltage relay will be described with reference to FIG.

First, before starting the relay test, the gain of the amplifier 3 is manually adjusted. Now, when the voltage / current generator 2 starts operating in response to a command from the personal computer 1, a voltage that changes linearly is generated as shown in FIG. 5, and this voltage is amplified by the amplifier 3 and given to the test relay 4. To be Then, it operates when the voltage applied to the test relay 4 exceeds a certain voltage value, and a relay operation signal is input from the test relay 4 to the voltage / current generator 2.

The voltage / current generator 2 supplies the personal computer 1 with the voltage when the relay operation signal is input. On the PC 1, the voltage taken from the voltage / current generator 2 is shown in FIG.
The voltage applied to the test relay 4 is calculated by the gain constant of the amplifier 3 based on the linear characteristic shown in FIG.

[0007]

However, in such a conventional protective relay testing apparatus, the output voltage of the voltage / current generator 2 generated during the operation of the test relay 4 and the voltage / current generator are generated. 2 receives a relay operation signal, and there is a time lag until the personal computer 1 obtains measurement data based on the voltage at that time, so an error occurs in the measurement data.

Further, from the linear characteristic of the voltage when the relay operation signal is input to the voltage / current generator 2 from the test relay 4 and the linear characteristic of the input voltage of the amplifier, the gain constant of the amplifier 3 is applied to the test relay 4. There is a problem that a measurement error occurs because the voltage that is present is calculated.

Further, since the gain of the amplifier is manually adjusted, accuracy control is unclear, and it is necessary to periodically calibrate the entire test apparatus, which requires a lot of labor and time.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a test device for a protective relay with high test accuracy, which can easily obtain the measured data of the protective relay with less measurement error.

[0011]

In order to achieve the above object, the present invention comprises a test device for a protective relay by the following means. The invention corresponding to claim 1 is provided with a memory function for storing test data such as measurement conditions and measurement elements for performing a static characteristic test of the test relay, and the memory function when the test start command is input. A voltage / current generator that outputs a voltage or current signal based on the test data stored in, and holds the voltage or current value at that time when an operation signal is input from the DUT, and this voltage -A distortion-free tester that has a function of amplifying the voltage or current signal input from the current generator and that gives a sinusoidal voltage or current signal with a low distortion factor to the test relay, and this distortion-free tester A voltage or current signal to be applied to the test relay, or a measuring device for measuring the frequency or electrical angle thereof, and the voltage or current value output from the voltage / current generator by the operation of the test relay. A voltage or current signal, or their frequency or electrical angle at the time of the measured-hold by the measuring device to be held is output as measurement data.

The invention according to claim 2 is provided with a memory function for storing test data such as measurement conditions and measurement elements for testing the dynamic characteristics of the test relay, and when a test start command is input. A voltage / current generator that repeatedly outputs a voltage or current signal at normal and failure times at fixed test intervals based on the test data stored in the memory function, and a voltage input from this voltage / current generator Alternatively, it has an amplification function for amplifying a current signal, and is provided with a non-distortion tester that gives a sinusoidal voltage or current signal with a small distortion factor to the test relay, and the voltage or current signal Counting starts when there is a sudden change from normal to failure or when there is a sudden change from failure to normal, and counts up when an operation signal or a return signal is input from the DUT, and the operating time of the DUT The counter function for measuring the return time is provided, and outputs the measured data to the measured provided 試継 collector operating time and return time this counter function.

According to a third aspect of the present invention, a computer programmed with test data such as measurement conditions and measurement elements for testing the static characteristics of the test relay, and the test data input from the computer are stored in the computer. It has a memory function to store, and when a test start command is input from the computer, it outputs a voltage or current signal based on the test data stored in the memory function, and an operation signal is input from the test relay. Then, a sine wave with a small distortion factor that has a voltage / current generator that holds the voltage or current value at that time and an amplification function that amplifies the voltage or current signal input from this voltage / current generator Distortion-free tester that applies the voltage or current signal of the above to the relay under test, and the voltage or current signal or the frequency A measuring device for measuring the number or the electrical angle, and the computer is measured by the measuring device when the voltage or current signal output from the voltage / current generator is held by the operation of the test relay. It has a function of taking in the voltage or current signal at the time of holding or the frequency or electrical angle thereof and outputting this as measurement data.

The invention according to claim 4 is a computer programmed with test data such as measurement conditions for testing static characteristics of a test relay, a plurality of levels with different voltage or current variation widths, and measurement elements. And a memory function for storing the test data input from the computer, and when a test start command is input from the computer, a voltage or current according to the level based on the test data stored in the memory function. A voltage / current generator that outputs a signal and holds the voltage or current value at that time when an operation signal is input from the test relay, and a voltage or current signal input from this voltage / current generator A non-distortion tester that has a function of amplifying and that supplies a sinusoidal voltage or current signal with a small distortion factor to the test relay And a measuring device for measuring a voltage or current signal to be applied to the test relay or a frequency or an electrical angle thereof, wherein the computer has a variation range of the voltage or current output from the voltage / current generator other than the minimum level. At this time, when the voltage or current value of the voltage / current generator is held by the operation of the test relay, the voltage / current generator is stepped down one step from the voltage or current value at the time of holding. After confirming that the test relay has returned, give a command to the voltage / current generator to generate a voltage or current at a level with a gradually changing range, and change the voltage or current output from the voltage / current generator. When the width is at the minimum level, when the voltage or current value of the voltage / current generator is held by the operation of the DUT Voltage or current signals or their frequency or capture the electrical angle, and outputting them as measured data.

According to a fifth aspect of the invention, a computer programmed with test data such as measurement conditions and measurement elements for testing the dynamic characteristics of the test relay, and the test data input from this computer are stored in the computer. A voltage that has a memory function for storing and that repeatedly outputs a voltage or current signal at normal and failure times at regular test intervals based on the test data stored in the memory function when a test start command is input. Current generator and this voltage
A non-distortion tester that has a function of amplifying a voltage or current signal input from a current generator, and that provides a sinusoidal voltage or current signal with a small distortion factor to the test relay, the voltage / current The generator starts counting when the voltage or current signal suddenly changes from a normal time to a failure or from a failure to a normal time, and counts up when an operation signal or a return signal is input from the test relay, and the test relay Has a counter function for measuring the operation time and the recovery time, and the computer takes in the operation time and the recovery time of the test relay measured by the counter function from the voltage / current generator, and uses this as the measurement data. Has a function to output.

In the invention corresponding to the above-mentioned claim 1,
The test data for the static characteristic test is stored by the memory function of the voltage / current generator, the voltage / current is generated by the test start command, amplified by the distortion-free tester, and then given to the test relay. When the test relay operates, the relay operation signal is given to the voltage / current generator, the voltage / current at this time is held, and the voltage / current value is measured by the measuring instrument, so calibration is required. As a device for performing the measurement, only the measuring device needs to be used, and therefore, measurement data with a small measurement error can be easily and easily obtained.

In the invention corresponding to claim 2 above,
The test data to test the dynamic characteristics is stored by the memory function of the voltage / current generator, and the voltage / current at the time of normal and the voltage / current at the time of failure are alternately generated by the test start command, and this is undistorted. After amplifying by the tester, give it to the test relay, and when this test relay operates, give the relay operation signal to the voltage / current generator, measure the operating time of the test relay by the counter function, and then return it. Since the recovery time of the test relay is measured, it is possible to easily and easily obtain the measurement data with less measurement error.

In the invention corresponding to claim 3 above,
The test data for the static characteristic test programmed in the computer is stored by the memory function of the voltage / current generator.When the test start command is input from the computer to the voltage / current generator, the voltage / current is generated. After amplifying it with a strain-free tester, give it to the test relay,
When the test relay operates, the relay operation signal is given to the voltage / current generator to hold the voltage / current at this time, and the voltage or current signal measured by the measuring instrument or their frequency or electrical angle is sent to the computer. Take in,
Since this is output by a printer, for example,
The same effects as those of the invention corresponding to claim 1 can be obtained, and of course, a series of protection relay tests can be automatically performed.

In the invention corresponding to claim 4 above,
In addition to the action and effect of the invention according to claim 3, a voltage / current generator generates voltage or current signals of a plurality of levels having different change widths in accordance with a command from a computer, and supplies the voltage or current signals to the test relay. When the voltage or current value of the voltage / current generator is held by the operation of the relay under test when the change width of the voltage or current is other than the minimum level, the voltage / current value of the voltage / current generator is After confirming that the test relay has been restored by one step down, voltage or current is generated at a level with a gradually changing width, and at the minimum level voltage or current value, the voltage or current signal or its frequency or electrical Since the corner is taken in, it is possible to improve the measurement accuracy.

In the invention corresponding to claim 5 above,
The test data for testing the dynamic characteristics programmed in the computer is stored by the memory function of the voltage / current generator, and when the test start command is given from the computer to the voltage / current generator, Alternately generate a voltage and current at the time of failure, amplify this with a distortion-free tester, and then give it to the test relay, and when this test relay operates, give the relay operation signal to the voltage and current generator to counter it. The operation time of the test relay is measured by the function, and when the test relay is restored, the return time of the test relay is measured, the data is taken into the computer, and the data is output by, for example, a printer. The same effect as the invention can be obtained, and it is possible to automatically perform a series of protective relay tests.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of a protective relay test apparatus according to the present invention. In this embodiment, as shown in FIG.
It is composed of a 1- and 8-phase voltage / current generator 12, a distortion-free tester 13, a measuring device 14, and a GPIB connector 16.

The personal computer 11 is programmed with various test data according to the type of the test relay 15 such as voltage, current, frequency, amplitude value, electrical angle and number of phases.

The 8-phase voltage / current generator 12 is a personal computer 1.
It has a memory function of storing the test data from No. 1 and has a function of generating a voltage, a current and a zero phase voltage and a current signal of each of the three phases in accordance with the test data stored in the memory.

A commercially available strain-free tester 13 is N Co., Ltd.
There are those of F circuit design block and those of Keihin Electric Sokki Co., Ltd. This distortion-free tester 13 is a power supply of AC200V,
It outputs a sinusoidal voltage or current with a low distortion, and can be used as an amplifier.

The measuring device 14 is capable of measuring multi-elements such as voltage, current, phase, frequency, etc.
It has the function of converting. Then, it can be transmitted to the personal computer 11 through the GPIB connector. This measuring instrument 1
For 4, a power master manufactured by NF Circuit Design Block Co., Ltd. can be used.

The GPIB connector 16 is linked to the measuring device 14, the personal computer 11 and the 8-phase voltage / current generator 12, and is capable of data transmission by connecting them. Next, the operation of the protective relay test apparatus configured as described above will be described. Here, the static characteristic test of the overvoltage relay as the test relay 15 will be described with reference to FIG.

Now, from the personal computer 11 to the 8-phase voltage / current generator 12, as test data, measurement conditions such as starting voltage, amplitude value and electrical angle, voltage change width (step width according to level, change here) When the step width with a large width is level V1 and the step width with a small change width is level V2), the relay operation detection time and the measurement element (voltage in this case) are transferred, these test data are obtained as an 8-phase voltage / current generator. 12 is stored in the memory.

In this state, when the personal computer 11 gives a test start command to the 8-phase voltage / current generator 12, the 8-phase voltage / current generator 12 generates a step voltage V1. Is amplified by the distortion-free tester 13 and then given to the overvoltage relay 15.

When the step voltage generated from the 8-phase voltage / current generator 12 exceeds the operating value of the overvoltage relay 15, the overvoltage relay 15 operates and its operation signal is given to the 8-phase voltage / current generator 12. The 8-phase voltage / current generator 12 holds the voltage state at that time.

Next, when the 8-phase voltage / current generator 12 sends data indicating that the overvoltage relay 15 has operated to the personal computer 11, the 8-phase voltage / current generator 12 changes the voltage step width level in the personal computer 11. Give the instruction again.

In the 8-phase voltage / current generator 12, the overvoltage relay 15 is temporarily restored so that the overvoltage relay 15
After reducing the voltage held during the operation of 1 step by one step and confirming that the overvoltage relay 15 has returned, the level V
Enter the test according to 2.

At this time, the step voltage whose variation width is smaller than that of the 8-phase voltage / current generator 12 is the distortion-free tester 13 as described above.
To the overvoltage relay 15 via. When the step voltage generated by the 8-phase voltage / current generator 12 exceeds the operation value of the overvoltage relay 15, the overvoltage relay 15 operates again, and the operation signal is given to the 8-phase voltage / current generator 12, The voltage state at that time is held. Also,
Data indicating that the overvoltage relay 15 has been operated again is also sent to the personal computer 11.

On the other hand, in the personal computer 11, the overvoltage relay 15
When the operation is confirmed again, the voltage value of the overvoltage relay 15 at the time of operation measured by the measuring device 14 is taken in, the data is written as a test result in the result table (file) of the corresponding overvoltage relay, and is output by the printer. .

The above is a test for one overvoltage relay, but in reality, a plurality of overvoltage relays are sequentially tested. In this case, the number of overvoltage relays to be tested on the personal computer 11 is set in advance as a point, and the measurement point is switched every time one overvoltage relay is tested, and the same test is performed. Be done.

As described above, in the present embodiment, the test data from the personal computer is stored by the memory function of the 8-phase voltage / current generator 12, and the voltage / current is generated by the instruction from the personal computer 11 so that it is not stored. After being amplified by the distortion tester 13, it is given to the test relay 15 and when the test relay 15 operates, the relay operating signal is sent to the 8-phase voltage / current generator 1.
Since the voltage and current at this time are given to 2 and are held, and the voltage and current values are measured by the measuring device and transferred to the personal computer 11, a series of protective relay tests can be automatically performed. Therefore, it is sufficient to perform only the measuring device as a device requiring calibration, and therefore, measurement data with few measurement errors can be easily and easily obtained.

Further, since the voltage or current value when the test relay operates is held in the 8-phase voltage / current generator 12, the voltage / current generator receives the relay operation signal as in the conventional case, and at that time. There is no time lag due to the processing time until the measurement data is obtained by the personal computer based on the voltage of, and the measurement error can be minimized.

A second embodiment of the present invention will be described. In the second embodiment, the measuring device 1 shown in FIG.
4 is not used, and the eight-phase voltage / current generator 12 is the same as the first embodiment except that it has a memory function and a counter function for measuring the operation time and the recovery time of the test relay. .

Next, a dynamic characteristic test of a fault voltage relay as the test relay 15 in the second embodiment having the above-mentioned structure will be described with reference to FIG. Now, the normal voltage value and the failure voltage value, the test interval cycle time, the test interval cycle, and the number of repeated measurements are programmed as test data in the 8-phase voltage / current generator 12 from the personal computer 11.

Now, when the normal voltage value, the failure voltage value, the test interval period and the stop state are transferred from the personal computer 11 to the 8-phase voltage / current generator 12, these test data are stored in the 8-phase voltage / current generator 12. Stored in memory.

When a test start command is given from the personal computer 11 to the 8-phase voltage / current generator 12 in such a state, a normal voltage is first generated from the 8-phase voltage / current generator 12 at each test interval. Then, a failure voltage that suddenly changes from this normal voltage is generated.

When these voltages are applied to the fault voltage relay 15 through the distortion-free tester 13, the fault voltage relay 15 operates when the input voltage becomes equal to or lower than the operation set value,
When the operation set value is exceeded, it returns.

Here, the measurement of the operating time and the recovery time of the fault voltage relay 15 will be described. First, when the normal voltage generated from the 8-phase voltage / current generator 12 suddenly changes to a fault voltage, the counter function is set at that time, and when the operation signal is input from the fault voltage relay 15, it is counted up. Therefore, the operating time of the fault voltage relay 15 is measured from the count value from the setting of the counter function to the counting up.

Next, when the fault voltage generated from the 8-phase voltage / current generator 12 suddenly changes to a normal voltage, the counter function is set at that time, and when the recovery signal is input from the fault voltage relay 15, that is, When the operation signal is no longer input, it is counted up. Therefore, the recovery time of the fault voltage relay 15 is measured from the count value from the setting of the counter function to the count up.

When the set number of times is measured in each test interval period, the measured data is input to the personal computer 11 and the data is written as a test result in the result table of the corresponding fault voltage relay.

Then, every time the test of one fault voltage relay is completed, the measurement point is switched and the same test as described above is performed on the next fault voltage relay. As described above, in the second embodiment, the test data such as the normal voltage value and the fault voltage value, the test interval period, and the stop state are stored by the memory function of the 8-phase voltage / current generator 12 from the personal computer 11, A normal voltage and a fault voltage are alternately generated in response to a command from the amplifier and amplified by the non-distortion tester 13, and then given to the fault voltage relay 15, and when the fault voltage relay 15 operates, the relay operating signal is an 8-phase voltage. A series of protective relays are provided because the operating time of the faulty voltage relay 15 is measured by the counter function by giving it to the current generator 12, and when the faulty voltage relay 15 is restored, the recovery time of the faulty voltage relay 15 is measured and transferred to the personal computer 11. The test can be automatically performed, and measurement data with few measurement errors can be easily and easily obtained.

In the first and second embodiments described above, the voltage relay such as the overvoltage relay and the fault voltage relay has been described as the test relay, but the current relay and other relays may be used. It goes without saying that it can be carried out in the same manner as described above by changing the test data such as the measurement conditions and the measurement elements.

[0047]

As described above, according to the present invention, it is possible to provide a test device for a protective relay with a high test accuracy that can easily obtain the measured data of the protective relay with a small measurement error.

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing a first embodiment of a protective relay according to the present invention.

FIG. 2 is a time chart for explaining a static characteristic test of an overvoltage relay as a test relay in the same embodiment.

FIG. 3 is a time chart for explaining a dynamic characteristic test of a fault voltage relay as a test relay in the second embodiment of the present invention.

FIG. 4 is a block configuration diagram showing a conventional protective relay test apparatus.

FIG. 5 is a time chart for explaining a static characteristic test of an overvoltage relay as a test relay in the same test apparatus.

[Explanation of symbols]

11 …… PC, 12 …… 8-phase voltage / current generator, 1
3 ... No distortion tester, 14 ... Measuring instrument, 15 ... Test relay, 16 ... GPIB connector.

Claims (5)

[Claims] 1. A memory function for storing test data such as measurement conditions and measurement elements for performing a static characteristic test of a test relay, and stored in the memory function when a test start command is input. A voltage / current generator that outputs a voltage or current signal based on test data and holds the voltage or current value at that time when an operation signal is input from the test relay, and this voltage / current generator A non-distortion tester that has a function of amplifying the input voltage or current signal and gives a sinusoidal voltage or current signal with a small distortion factor to the test relay, and a test relay from this non-distortion tester And a measuring instrument for measuring the frequency or electrical angle of the voltage or current signal given to the device, and the voltage or current value output from the voltage / current generator is held by the operation of the test relay. That the testing device of the protective relay is characterized in that so as to output a voltage or current signal, or their frequency or electrical angle at the time of the measured-hold by the measuring instrument as measurement data. 2. A memory function for storing test data such as measurement conditions and measurement elements for testing the dynamic characteristics of the test relay is provided, and stored in the memory function when a test start command is input. A voltage / current generator that repeatedly outputs a voltage or current signal at normal and failure times based on test data at fixed test intervals, and an amplification that amplifies the voltage or current signal input from this voltage / current generator. A non-distortion tester that has a function and provides a sinusoidal voltage or current signal with a small distortion factor to the relay under test, and when the voltage or current signal from the normal time to the failure or failure A cow that starts counting when it suddenly changes from time to normal and counts up when an operation signal or a return signal is input from the test relay and measures the operating time and the return time of the test relay. Provided data function, the test apparatus of the protection relay, characterized in that the output as measurement data of the measured subject 試継 collector operating time and return time this counter function. 3. A computer in which test data such as measurement conditions and measurement elements for testing the static characteristics of the test relay is programmed, and a memory function for storing the test data input from the computer, And when a test start command is input from the computer, a voltage or current signal is output based on the test data stored in the memory function, and when an operation signal is input from the test relay, the voltage at that time is input. Or, it has a voltage / current generator that holds the current value and an amplification function that amplifies the voltage or current signal input from this voltage / current generator,
A non-distortion tester that gives a sinusoidal voltage or current signal with a small distortion factor to the test relay, and a measurement that measures the voltage or current signal or its frequency or electrical angle given to the test relay by this non-distortion tester. And the computer, when the voltage or current value output from the voltage / current generator is held by the operation of the test relay, the voltage or current signal at the time of the hold measured by the measuring device or A test device for a protective relay having a function of taking in those frequencies or electrical angles and outputting them as measurement data. 4. A computer programmed with test data such as measurement conditions for testing static characteristics of a test relay, a plurality of levels having different voltage or current change widths, measurement elements, and the like, which are input from this computer. A memory function for storing the test data, and when a test start command is input from the computer, outputs a voltage or current signal according to the level based on the test data stored in the memory function, and It has a voltage / current generator that holds the voltage or current value at the time when an operation signal is input from the test relay, and an amplification function that amplifies the voltage or current signal input from this voltage / current generator. And a distortion-free tester that applies a sinusoidal voltage or current signal with a low distortion factor to the relay under test, and the voltage applied to the relay under test from this distortion-free tester. A pressure or current signal, or a measuring device for measuring the frequency or electrical angle thereof, wherein the computer is the test sample when the change width of the voltage or current output from the voltage / current generator is other than the minimum level. When the voltage or current value of the voltage / current generator is held by the operation of the relay, the voltage / current generator is brought down one step from the voltage or current value at the time of holding, and the test relay is restored. After confirming that, when the voltage / current generator is commanded to generate a voltage or current at a level with a small change width in sequence, the change width of the voltage or current output from the voltage / current generator is at the minimum level. When the voltage or current value of the voltage / current generator is held by the operation of the test relay, the voltage or current signal at the time of the hold measured by the measuring device or A test device for a protective relay having a function of taking in these frequencies or electrical angles and outputting them as measurement data. 5. A computer in which test data such as measurement conditions and measurement elements for testing the dynamic characteristics of the test relay is programmed, and a memory function for storing the test data input from the computer, Further, when a test start command is input, a voltage / current generator that repeatedly outputs a voltage or current signal at a normal time and at a failure based on the test data stored in the memory function at constant test intervals, and this voltage. A non-distortion tester that has a function of amplifying a voltage or current signal input from a current generator, and that provides a sinusoidal voltage or current signal with a small distortion factor to the test relay, The current generator starts counting when the voltage or current signal suddenly changes from normal to failure or from failure to normal, and the operation signal or return signal is sent from the relay under test. Has a counter function that counts up when the input is input to measure the operating time and the recovery time of the test relay, and the computer has the counter of the test relay measured by the counter function from the voltage / current generator. A test device for a protective relay, having a function of taking in an operating time and a recovery time and outputting the measured data as measurement data.