JPH1023651A - Protective relay device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly carry out the automatic test and understand the test result easily by a method, wherein the automatic test result is compared with a predetermined protective relay setting value to judge the acceptability of the test result and the judgment result is printed by a printer, and if the test result is not acceptable, an alarm is issued by an alarm device. SOLUTION: A judgment circuit 10 judges the acceptability of the automatic test result obtained by an automatic test circuit 6. The automatic test result is compared with a protective relay setting value which is stored in the automatic test control circuit 6, beforehand by the judgment circuit 10, to judge the acceptability of the test result. The judgment result of the judgment circuit 10 is printed by a printer 11 as a record and, if the test result is judged to be unacceptable, a warning is issued by a warning device 12a. With this constitution, the connection of the printer, the printing of the automatic test result, the verification of the set value list and the judgment can be automatically executed, without the intervention of a human being. As a result, the automatic test can be carried out properly, and the test result can be easily understood.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection relay device for protecting and monitoring an operation state of a power system.

[0002]

2. Description of the Related Art Generally, a protection relay device detects voltage and current of a power system, determines an accident based on the detected voltage and current, and outputs a trip signal to a circuit breaker when it is determined that an accident has occurred. The section is separated from the power system. Some of such protection relay devices are provided with an automatic test unit for checking the soundness of an accident determination unit that performs an accident determination.

FIG. 2 is a configuration diagram of a protection relay device having an automatic test unit 20 for confirming the soundness of the accident determination unit 19.

The voltage of the power system is detected by a voltage transformer 2, and the current of the power system is detected by a current transformer 3. The detected voltages and currents are input to the various protection relays 4 of the accident determination unit 19, and each of the protection relays 4 determines whether the operation is inoperative. Then, the operation state or non-operation state of these various protection relays 4 is input to the trip matrix 5, and in this trip matrix 5, the operation mode of the various protection relays 4 is combined to determine the accident mode. Depending on the accident mode of the judgment result, the output contact 21
And outputs a trip signal to the circuit breaker 1 via the.

On the other hand, when testing various protection relays 4,
The automatic test unit 20 is started. The automatic test unit 20 is activated by the test activation switch 6a. The automatic test control circuit 6 of the automatic test section 20 controls the start and stop of the automatic test of the various protection relays 4 and the test progress by the start / stop circuit. A command to open the output contact 21 to lock the trip signal a is output.
This locks the trip signal to the breaker 1 under test.

Further, the automatic test control circuit 6 outputs a command for generating a voltage simulation signal and a current simulation signal to the simulation signal generator 22. That is, a command for generating a voltage simulation signal is output to the voltage generator 8, and a command for generating a current simulation signal is output to the current generator 9. Thereby, at the time of the test, the simulated voltage signal and the simulated current signal are input to the various protection relays 4, and the test of the accident determination unit 19 is performed.

[0007]

However, in such a conventional apparatus, each time an automatic test is performed, a human sets up a temporary printer and prints out the test results. Then, the pass / fail test is performed by comparing data between the test result printed out and the protection relay set value. For this reason, it takes time to determine the test result after the automatic test, and it has not been possible to quickly find an abnormality in the accident determination unit. In addition, there are many operations in which humans directly intervene, and in particular, operation errors due to human error have occurred.

In this automatic test, since the trip signal a to the circuit breaker 1 from the trip matrix output, which is the last stage output of the protection relay device, is collectively locked, all the protection relays 4 are collectively locked. Even during the automatic test execution, the protection relay 4 which has completed the test which does not need to be locked and the protection relay 4 which is waiting for the test to start are locked.

On the other hand, when the automatic test starts, the protection relay 4
The secondary input of the voltage transformer 2 is switched to the voltage generator 8 side of the simulation signal generator 22, but the phase of the secondary input of the voltage transformer 8 and the voltage simulation signal from the voltage generator 8 are one. Therefore, when switching, the residual voltage in the protection relay 4 becomes zero.
Although it is necessary to switch the voltage after the voltage has decreased to V, some switching time is required although it is useless.

At the start of the automatic test, the protection relay 4
Although the output of the current generator 9 is superimposed on the secondary input of the current transformer 3, the phase of the secondary input of the current transformer 3 does not match the phase of the current simulation signal from the current generator 9. In many cases, the current flowing into the protection relay 4 did not flow as set, and the accuracy of the automatic test was poor.

Further, when a system accident actually occurs,
Various protection relays 4 are operated one after another according to the case of the accident. However, since it is not clear which protection relay 4 operated first, it was not possible to analyze what kind of accident was caused.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a protection relay device capable of appropriately performing an automatic test and easily grasping a test result.

[0013]

According to a first aspect of the present invention, a voltage and current detected via a voltage transformer and a current transformer are input to various protection relays, and the operation states of the various protection relays are combined to set an accident mode. An accident judging unit that judges and outputs a trip signal to the circuit breaker according to the accident mode, locks the trip signal to the circuit breaker when testing various protection relays, and inputs a simulated voltage signal and a simulated current signal to various protection relays. An automatic test unit for performing a test of the accident determination unit by performing an automatic test unit, wherein the automatic test unit compares the automatic test result with a predetermined protection relay set value to determine whether the automatic test result is good or bad; And a warning device for issuing a warning when the determination result is negative.

According to the first aspect of the present invention, the judgment circuit compares the automatic test result with a predetermined protection relay set value to judge whether the automatic test result is good or not, and prints the judgment result from the judgment circuit on a printer. If the result is negative, an alarm is issued to the alarm.

According to a second aspect of the present invention, in the first aspect, the automatic test section determines a trip signal to be locked for each test mode of the protection relay, and selects and locks a trip signal corresponding to the test mode. Provided with an automatic selection switching circuit for this purpose.

According to a second aspect of the present invention, in addition to the operation of the first aspect, the automatic selection switching circuit of the automatic test section determines a trip signal to be locked for each test mode of the protection relay, and responds to the test mode. Select and lock the trip signal.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the automatic test unit takes in the voltage detected by the voltage transformer and generates a unit vector of the voltage, and a simulation unit. A multiplier for multiplying the output of the voltage signal by a voltage unit vector.

According to a third aspect of the present invention, in addition to the operation of the first or second aspect, the unit vector device takes in the voltage detected by the voltage transformer, generates a unit vector of the voltage, and generates a unit vector of the voltage. Multiplies the output of the simulated voltage signal by the voltage unit vector, and inputs a voltage having the same phase as the voltage detected by the voltage transformer to the protection relay.

The invention of claim 4 is the invention of claims 1 to 3
In the invention of the above, the automatic test unit was provided with a unit vector unit that takes in the current detected by the current transformer and generates a unit vector of the current, and a multiplier that multiplies the output of the simulated current signal by the current unit vector. Things.

According to a fourth aspect of the present invention, in addition to the operations of the first to third aspects, the unit vector device takes in the current detected by the current transformer to generate a unit vector of the current, and the multiplier has The output of the simulated current signal is multiplied by the current unit vector, and the current in phase with the current detected by the current transformer is input to the protection relay.

According to a fifth aspect of the present invention, in the third aspect of the present invention, the automatic test unit takes in the voltage detected by the voltage transformer and the output of the multiplier and compares the phase with the comparator. And an alarm device for issuing an alarm when the result is inconsistent.

According to a fifth aspect of the present invention, in addition to the operation of the third aspect of the present invention, the voltage detected by the voltage transformer and the output of the multiplier are taken in, and the phases are compared by a comparator. If they do not match, an alarm is issued to the alarm device to detect a failure in the voltage unit vector device.

According to a sixth aspect of the present invention, in the invention of the fourth aspect, the automatic test section takes in the current detected by the current transformer and the output of the multiplier to compare the phases, and the comparison by the comparator And an alarm device for issuing an alarm when the result is inconsistent.

According to a sixth aspect of the present invention, in addition to the operation of the fourth aspect, the current detected by the current transformer and the output of the multiplier are taken in, and the phase is compared by the comparator. If they do not match, an alarm is issued to the alarm device to detect the failure of the current unit vector device.

The invention of claim 7 is the first to sixth aspects of the present invention.
In the invention described in the above, the automatic test unit captures the operation signal of the protection relay and stores the protection relay operation signal that was first activated at the time of the occurrence of the accident, and a first hit detection signal from the first hit detection circuit. And a lamp display for displaying a lamp.

According to the seventh aspect of the present invention, in addition to the functions of the first to sixth aspects of the present invention, the first hit detection circuit captures the operation signal of the protection relay and operates the protection relay first when an accident occurs. The signal is stored, and the first hit detection signal from the first hit detection circuit is displayed as a lamp on a lamp display.

[0027]

Embodiments of the present invention will be described below. FIG. 1 is a configuration diagram showing a first embodiment of the present invention. In FIG. 1, the voltage of the power system is detected by a voltage transformer 2, and the current of the power system is detected by a current transformer 3. The detected voltages and currents are input to the various protection relays 4 of the accident determination unit 19, and each of the protection relays 4 determines whether the operation is inoperative. The operation state or non-operation state of these various protection relays 4 is input to a trip matrix 5.
The accident mode is determined by combining the operation states of the various protection relays 4. A trip signal is output to the circuit breaker 1 via the output contact 21 according to the accident mode as a result of the determination.

On the other hand, when testing the protection relays 4,
The automatic test unit 20 is started. The automatic test unit 20 is activated by the test activation switch 6a. The automatic test control circuit 6 controls the start and stop of the automatic test of the various protection relays 4 and the test progress by the start / stop circuit.
A command to open the output contact 21 to lock the trip signal a to the circuit breaker 1 is output. This locks the trip signal to the breaker 1 under test. The automatic test switching circuit 7 includes an automatic selection switching circuit 13 described later.
Is provided, only the output contact 21 related to the test mode is opened by the test mode of the protection relay 4, and the trip signal of only the protection relay 4 related to the test mode is locked.

Further, the automatic test control circuit 6 outputs a command for generating a voltage simulation signal and a current simulation signal to the simulation signal generator 22. That is, a command for generating a voltage simulation signal is output to the voltage generator 8, and a command for generating a current simulation signal is output to the current generator 9. Thereby, at the time of the test, the simulated voltage signal and the simulated current signal are input to the various protection relays 4, and the test of the accident determination unit 19 is performed. Each of the voltage generator 8 and the current generator 9 is provided with a unit vector unit 14 and a multiplier 15 which will be described later, and includes a voltage detected by the voltage transformer 2 and a current detected by the current transformer 3. An in-phase voltage simulation signal and a current simulation signal are output.

In order to confirm the soundness of the voltage unit vector unit 14a, the comparator 16a and the alarm unit 12b
Are provided, and similarly, the unit vector device 14
In order to confirm the soundness of b, a comparator 16b and an alarm 12c are provided.

Next, the judgment circuit 10 judges the quality of the automatic test result obtained by the automatic test control circuit 6. That is, the automatic test result in the automatic test control circuit 6 is compared with the protection relay set value stored in the automatic test control circuit 6 in advance in the determination circuit 10 to determine whether the automatic test result is good or bad. Then, the determination result of the determination circuit 10 is printed by the printer 11 as a record. When the result of the judgment by the judgment circuit 10 is negative, an alarm is transmitted to the alarm device 12a. As a result, the connection of the printer, the printing of the automatic test data, the comparison with the set value list, and the determination of the result, which were conventionally performed by a human every time an automatic test is performed, without human intervention are automatically performed. Can be.

Further, the automatic selection switching circuit 13 opens only the output contact 21 related to the test mode by the test mode of the protection relay 4 and locks the trip signal of only the protection relay 4 related to the test mode. is there. That is, the protection relay corresponding to the protection mode is determined according to the test mode of the protection relay 4, for example, in a mode such as overcurrent protection, short-circuit protection, ground fault protection, low-voltage protection, and overvoltage protection. Is locked for the corresponding trip signal a. In FIG. 1, mode A, mode B,
The case where there are three modes of mode C is shown. As described above, the mode is divided into several modes, and the trip signal lock can be switched by the automatic selection switching circuit 13 for each protection relay.

Thus, the protection relay 4 during the automatic test is
Only the trip lock can be performed. Conventionally, all the protection relay functions are collectively trip-locked to the circuit breaker 1 during the automatic test. For the protection relay 4 for which the test has not been started, the trip circuit can be utilized.

A unit vector unit 1 which takes in the secondary voltage of the voltage transformer and generates a unit vector of the secondary voltage of the voltage transformer.
4a and a multiplier 15a for multiplying the output of the voltage generator 8 by a unit vector as an additional component, and the unit vector unit 14a detects the phase of the secondary voltage of the voltage transformer 2 and A unit vector that generates a unit vector in phase with the secondary voltage of the voltage transformer 2 is multiplied by the unit vector with the voltage simulation signal from the voltage generator 8 to form a unit vector in phase with the secondary voltage of the voltage transformer 2. Is superimposed on the protection relay 4. This makes it possible to apply the in-phase voltage simulation signal to the protection relay 4 even during charging of the main circuit. Conventionally, the switching time of the secondary circuit of the voltage transformer 2 is redundantly provided. However, this switching mechanism becomes unnecessary, and the automatic test time can be short-circuited.

Similarly, regarding the current simulation signal, the unit vector unit 14b takes in the secondary current of the current transformer 3 and generates a unit vector of the secondary current of the current transformer. Then, the output of the current generator 9 is multiplied by the unit vector by the multiplier 15b.
To superimpose a current in the same phase as the secondary current of the current transformer 3 on the protection relay 4. As a result, even when the main circuit is energized, the in-phase current simulation signal can be passed to the protection relay 4 with high accuracy. Conventionally, the current flowing into the protection relay 4 does not flow according to the set value in many cases, and the accuracy of the automatic test is poor. However, since the accuracy of the current flowing into the protection relay 4 is increased, a high-precision automatic test is possible. Become.

The unit vector unit 14a is provided with a comparator 16a and an alarm 12b. Comparator 16
a takes in the secondary voltage of the voltage transformer 2 and the output of the multiplier 15a and compares the phases, and when the comparison result does not match, sends an alarm to the alarm 12b. The failure of the unit vector unit 14a can be detected. If the unit vector unit 14a has failed, the protection relay 4 and the secondary voltage of the voltage transformer 2 and the multiplier 15a
In some cases, the automatic test result may be erroneously determined to be negative due to the phase difference from the output of the above, but such a case can be prevented.

Similarly, a comparator 16b and an alarm 12c are provided in the unit vector unit 14b. Comparator 1
6b takes in the secondary current of the current transformer 2 and the output of the multiplier 15b, compares the phases, and issues an alarm to the alarm 12c when the comparison result does not match. As a result, since the failure of the unit vector device 14b of the current can be detected, if the unit vector device 14b fails, the protection relay 4 outputs the secondary current of the current transformer 3 and the output of the multiplier 15b. It is possible to prevent the automatic test result from being erroneously determined to be negative due to the phase difference.

Next, a first hit detection circuit 17 which takes in the operation signal of the protection relay 4 and stores the operation signal of the protection relay 4 which was operated first in the event of an accident, and a lamp indicator which displays the first hit detection signal on a lamp. 18 are provided. The first hit detection circuit 17 stores the protection relay element that has operated first in the event of a system failure, does not accept the protection relay 4 that operates continuously, and displays the stored value of the first hit detection circuit 17 on a lamp display 18 as a lamp. Let it. As a result, the first operation protection relay at the time of a system fault can be specified by the lamp display, and the cause of the accident at the time of a system fault can be easily analyzed.

[0039]

As described above, according to the present invention, an automatic test can be properly performed, and the test result can be easily grasped.

According to the first aspect of the present invention, at the time of the automatic test, operations such as installation and connection of the printer, printing of the automatic test data, collation with the set value list, and judgment of the result are unnecessary. Can be easily performed. That is, automation is achieved, and the enormous effort, time, and human error caused by human intervention are significantly reduced.

According to the second aspect of the present invention, only the protection function of the protection relay being automatically tested is locked without locking all the protection functions at the time of the automatic test. The function can work effectively.

According to the third aspect of the present invention, the voltage simulation signal obtained by the automatic test can be superimposed on the secondary voltage of the voltage transformer in phase, so that the switching circuit of the voltage transformer circuit which is indispensable for the protection relay device. Becomes unnecessary. That is, since the switching time can be eliminated, the automatic test time is short-circuited.

According to the fourth aspect of the present invention, the simulated current from the automatic test can be superimposed on the secondary current of the current transformer in phase with the secondary current, so that the current flowing into the protection relay at the time of the automatic test is as set. Eliminate the problem of not flowing,
High-precision automatic testing becomes possible.

According to the fifth aspect of the present invention, a failure diagnosis of a unit vector device for superimposing a voltage simulation signal by an automatic test on a secondary voltage of a voltage transformer can be performed, and the reliability as a protection relay device can be improved. improves.

According to the sixth aspect of the present invention, a fault diagnosis of a unit vector device for superimposing a current simulation signal by an automatic test on a secondary current of a current transformer can be performed, and reliability as a protection relay device can be improved. improves.

According to the seventh aspect of the present invention, the first operation relay at the time of a system fault can be specified, which can contribute to early analysis of the cause of the fault.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Breaker 2 Voltage transformer 3 Current transformer 4 Protection relay 5 Trip matrix 6 Automatic test control circuit 6a Test start switch 7 Automatic test switching circuit 8 Voltage generator 9 Current generator 10 Judgment circuit 11 Printer 12 Alarm 12 Automatic selection Switching circuit 14 Unit vector unit 15 Multiplier 16 Comparator 17 First hit detection circuit 18 Lamp display 19 Accident determination unit 20 Automatic test unit 21 Output contact 22 Simulated signal generator

Claims (7)

[Claims] A voltage and a current detected through a voltage transformer and a current transformer are input to various protection relays, and an operation mode of the various protection relays is combined to determine an accident mode, and a breaker is determined according to the accident mode. An accident determination unit that outputs a trip signal to the circuit, and a test of the accident determination unit by locking a trip signal to the circuit breaker and inputting a simulated voltage signal and a simulated current signal to the various protection relays when testing the various protection relays. And a determination circuit for determining whether the automatic test result is acceptable by comparing the automatic test result with a predetermined protection relay set value, and determining a determination result from the determination circuit. A protection relay device comprising a printer for printing and an alarm device for issuing an alarm when the judgment result is negative. 2. The automatic tester determines a trip signal to be locked for each test mode of the protection relay,
2. The protection relay device according to claim 1, further comprising an automatic selection switching circuit for selecting and locking a trip signal corresponding to the test mode. 3. The automatic test unit includes: a unit vector unit that receives a voltage detected by the voltage transformer and generates a unit vector of the voltage; and a multiplication unit that multiplies an output of the simulated voltage signal by the voltage unit vector. The protection relay device according to claim 1 or 2, wherein the protection relay device includes a relay. 4. The automatic test unit according to claim 1, further comprising: a unit vector unit for receiving a current detected by said current transformer and generating a unit vector of the current; and a multiplication unit for multiplying an output of said simulated current signal by said current unit vector. 4. The protection relay device according to claim 1, wherein the protection relay device comprises a relay. 5. The automatic test section, comprising: a comparator for taking in the voltage detected by the voltage transformer and an output of the multiplier for phase comparison; and an alarm when the comparison result in the comparator does not match. The protection relay device according to claim 3, further comprising: an alarm that emits. 6. The automatic test section includes a comparator for taking in the current detected by the current transformer and an output of the multiplier and comparing the phases, and an alarm when the comparison result in the comparator does not match. The protection relay device according to claim 4, further comprising: an alarm that emits. 7. A first hit detection circuit for receiving an operation signal of the protection relay and storing an operation signal of a protection relay activated first when an accident occurs, and detecting a first hit from the first hit detection circuit. 7. The protection relay device according to claim 1, further comprising: a lamp indicator for displaying a signal as a lamp.