JP2007236100A - Test system, test method and test program of protection relay, and recording medium for recording program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a test system, a test method, a test program and a recording medium of a protective relay for accurately inspecting the protective relay. <P>SOLUTION: A controller 2 applies a first instruction for changing the level of a test voltage/current applied to the tested protective relay Ry1 in the fixed direction to a tester 1. If the protective relay Ry1 is operated by the test voltage/current outputted from the tester 1 by the first instruction, the controller 2 applies a second instruction for changing the level of the test voltage/current in the reverse direction to the tester 1. If the protective relay Ry1 is recovered by the test voltage/current outputted from the tester 1 by the second instruction, the controller 2 applies a third instruction for moderately changing the level of the test voltage/current in a direction reverse to that of the tester 1, in comparison with the speed of a change in the level of the test voltage/current. If the protective relay Ry1 is operated by the test voltage/current outputted from the tester 1 by the third instruction, the controller 2 applies the test voltage/current during the operation on the protective relay Ry1 for a predetermined time, determines whether the protection relay Ry1 operates stably, and measures the operating values of the protective relay Ry1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a protection relay test system for testing the operation of a protection relay installed in a power system, a protection relay test method, a protection relay test program, and a recording medium on which the program is recorded.

The protective relay receives the current from the secondary side of the current transformer installed in the transmission line, etc., and the voltage from the secondary side of the measurement transformer installed in the transmission line, etc. Detect accidents that occur in power transmission lines, etc., based on voltage. Since such a protective relay is required to operate correctly in the power system, the protective relay is subjected to a predetermined inspection (for example, see Patent Document 1). Usually, a tester is used to check the protective relay. The protective relay tester applies a current or a voltage to the protective relay, and checks whether the protective relay operates at a preset set value, for example.
JP-A-7-35806

  The inspection of the protective relay using the protective relay tester described above has the following problems. For example, when checking the current characteristics of a protective relay, the operator operates the tester to increase or decrease the current flowing through the protective relay, and whether the protective relay operates within the allowable range of the set value set in the protective relay in advance. Find out. However, in this case, the timing at which the protective relay operates may be different when the operator suddenly increases or decreases the current or when the current increases or decreases slowly. On the other hand, since the protective relay is required to operate correctly, if the operating value at which the protective relay starts operating differs depending on the operator's work method, an accurate operating value cannot be obtained. An accurate inspection is not possible.

  An object of the present invention is to solve the above-mentioned problems and to enable a protective relay to be accurately checked. A protective relay test system, a protective relay test method, a protective relay test program, and a record in which the program is recorded To provide a medium.

  In order to solve the above-mentioned problem, the invention of claim 1 is directed to a first process for changing a test voltage / current level applied to test a protective relay in a certain direction, and the protection by the first process. When the relay operates, a second process for changing the level of the test voltage / current in the opposite direction to the first process, and a return of the protective relay in the second process, the test voltage / current A third process in which the level is changed in a direction opposite to that of the second process and gradually compared to the speed of the test voltage / current level change by the second process; and the third process. When the protective relay operates, the test voltage / current at this operation is applied to the protective relay for a predetermined time, and when the protective relay operates stably, the value of the test voltage / current is set to the operation of the protective relay. Including the fourth process as a value A method for testing a protective relay, wherein the door.

  In the invention of claim 1, when testing the protective relay, after the protective relay is operated once by the first process and the second process, the protective relay is returned by the third process, Change the test voltage and current gently and activate the protective relay again. Thereafter, if the operation is stable, the value of the test voltage and current at this time is set as the operation value of the protective relay.

  According to a second aspect of the present invention, in the protection relay test method according to the first aspect, the operation value obtained in the fourth process is determined depending on whether the protection relay is set in a permissible range. It is characterized by determining the quality of the protective relay.

  According to a third aspect of the present invention, in the protection relay test method according to the first or second aspect, the initial level of the test voltage / current by the first processing is set to a set value preset in the protection relay. It is characterized by doing.

  According to a fourth aspect of the present invention, in the protection relay test method according to the third aspect, when the test is a voltage characteristic test, a voltage output starting from a set value in the first processing is set as the test voltage / current. And, this voltage output is decreased.

  According to a fifth aspect of the present invention, in the protection relay test method according to the third aspect, when the test is a current characteristic test, a current output starting from a set value in the first processing is set as the test voltage / current. And, this current output is increased.

  According to a sixth aspect of the present invention, in the protection relay test method according to the fifth aspect, when a limiter is set for the set value, and the current output by the first processing reaches the limiter, the current output It is characterized by decreasing.

  According to the seventh aspect of the present invention, there is provided a first process for changing a test voltage / current level applied for testing the protective relay in a certain direction, and the test voltage when the protective relay operates in the first process. A second process for changing the current level in the opposite direction to the first process; and when the protective relay is restored in the second process, the test voltage / current level is changed to the second process. When the protective relay operates in the reverse direction and the third process that changes gently compared to the speed of the test voltage / current level change by the second process, and the third process, A test voltage / current at the time of operation is applied to the protective relay for a predetermined time, and when the protective relay operates stably, the test voltage / current is set as the operating value of the protective relay; A protective relay characterized in that Is a test program.

  The invention according to claim 8 is a computer-readable recording medium in which the test program for the protective relay according to claim 7 is recorded.

  The invention of claim 9 is a test system for a protective relay comprising a tester that outputs a test voltage / current for testing the protective relay, and a controller that controls the output of the tester. A first instruction for changing a level of a test voltage / current applied to test the relay in a certain direction is given to the tester, and the protection relay is used with the test voltage / current output from the tester according to the first instruction. When is operated, a second instruction for changing the level of the test voltage / current in the reverse direction is issued to the tester, and the protection relay is restored by the test voltage / current output from the tester according to the second instruction. Then, a third instruction for changing the level of the test voltage / current in the reverse direction and gently compared to the speed of the change in the level of the test voltage / current is given to the tester. When the protective relay operates at the test voltage / current output from the tester according to the third instruction, the test voltage / current at the time of operation is applied to the protective relay for a predetermined time, and the protective relay is stabilized. In the protection relay test system, the test voltage / current value is set as the operation value of the protection relay when operating.

  In the invention of claim 9, when testing the protective relay, after the protective relay is operated once by the first instruction and the second instruction, the protective relay is returned by the third instruction, Change the test voltage and current gently and activate the protective relay again. Thereafter, if the operation is stable, the value of the test voltage and current at this time is set as the operation value of the protective relay.

  According to the invention of claim 1 and the inventions of claims 7 to 9, when testing the protective relay, the protective relay is operated once. Therefore, it is first confirmed whether the protective relay is operated, Since the protection relay is operated again after slowly changing the test voltage and current after the protection relay is restored, the operating value at which the protection relay starts operating can be detected reliably and accurately. Accordingly, it is possible to automatically perform the test of the protective relay without depending on the manpower, and the same result can be obtained regardless of who tests the protective relay. Furthermore, since the manpower is omitted, it is possible to shorten the test time for obtaining the operating value of the protective relay.

  According to the invention of claim 2, the quality of the protective relay can be determined based on the detected operation value.

  According to the third aspect of the present invention, since the test voltage and current applied to the protective relay are started from the set value, it is possible to test the protective relay in a short time when the protective relay operates near the set value.

  According to the fourth aspect of the present invention, the protective relay for detecting a voltage change operates when the detected voltage becomes low, so that it is possible to shorten the test time of the voltage characteristic when starting from the test for decreasing the voltage level. To do.

  According to the fifth aspect of the present invention, the protective relay that detects a change in current operates when the detected current increases. Therefore, starting from a test that increases the current level, it is possible to shorten the test time of the current characteristics.

  According to the invention of claim 6, since the limiter is provided for the set value, it can be confirmed whether or not the protective relay operates within the allowable range of the set value.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1, the protection relay test system according to this embodiment tests the protection relay Ry1, and includes a tester 1 and a controller 2. There are many items in the test of the protective relay Ry1, for example, current characteristics, voltage characteristics, and operation time. In this embodiment, the voltage characteristics of the protective relay Ry1 are taken as an example. In the protective relay Ry1, a set value of the operating voltage, that is, a theoretical value is set in advance.

  The tester 1 gives the protective relay Ry1 a test voltage / current for testing the characteristics of the protective relay Ry1. When testing the voltage characteristics of the protective relay Ry1, the tester 1 applies a voltage output as a test voltage / current to the protective relay Ry1. At this time, the tester 1 changes the voltage output value over time under the control of the controller 2. Note that the tester 1 can manually change the voltage output value as in the prior art. The tester 1 checks whether or not the protective relay Ry1 is operated by the voltage output, for example, based on the presence or absence of a trip signal, and sends the operation result to the controller 2.

  The controller 2 controls the tester 1 and includes an interface 21, a processing unit 22, a storage unit 23, and an input / output unit 24. The controller 2 corresponds to a general-purpose machine such as a personal computer or a dedicated machine created for controlling the tester 1.

  The interface 21 is for connecting the controller 2 to the tester 1, sends an instruction to control the voltage output from the processing unit 22 to the tester 1, and operates the protective relay Ry 1 from the tester 1. The result and the like are sent to the processing unit 22. The input / output unit 24 is an input device that receives an instruction to start a test or the like by an operator's operation and sends the instruction to the processing unit 22. The input / output unit 24 is a display device that displays test results and the like output from the processing unit 22. The memory | storage part 23 memorize | stores the program relevant to the test of the protection relay Ry1 beforehand, and memorize | stores the test result which the process part 22 performed. Furthermore, the memory | storage part 23 memorize | stored the tolerance | permissible_range of the actual operating voltage with respect to the theoretical value of the protective relay Ry1 beforehand, and has memorize | stored the upper limit and lower limit of this tolerance | permissible_range as a limiter. The limiter which is the upper limit and the lower limit is set to the limit point of the pass / fail range of the protective relay Ry1. Further, the upper limiter is a limit point of the upper limit of the current value that flows to the protective relay Ry1, and prevents unnecessary overcurrent from flowing when the protective relay Ry1 is inspected.

  The processing unit 22 performs the tests shown in FIGS. 2 and 3 according to the program stored in the storage unit 23. In this embodiment, the processing unit 22 controls the tester 1 to continuously change the voltage level by sweeping. When the processing unit 22 receives the theoretical value and the test start instruction for the protective relay Ry1 from the input / output unit 24 (step S1), the processing unit 22 sets the theoretical value as the test start value and sets a predetermined ratio (the first number) An instruction to add a voltage output whose level is reduced from the theoretical value at a ratio of 1 to the protective relay Ry1 is issued (step S2). In this embodiment, since the protective relay Ry1 operates when the detected voltage is low, the protection relay Ry1 starts with a sweep that decreases the voltage level. After step S2, the processing unit 22 determines whether or not the protective relay Ry1 is operated from the operation result from the tester 1 (step S3). If it is determined in step S3 that the protective relay Ry1 is not operating, the processing unit 22 returns the process to step S2.

  When the processing unit 22 determines that the protective relay Ry1 has been operated in step S3, the processing unit 22 issues an instruction to add to the protective relay Ry1 a voltage output whose level increases at a rate equal to or less than the first rate (second rate) described above. 1 (step S4). After step S4, the processing unit 22 determines whether or not the protective relay Ry1 has returned from the operation result from the tester 1 (step S5). If it is determined in step S5 that the protective relay Ry1 has not been restored, the processing unit 22 returns the process to step S4.

  When the processing unit 22 determines that the protective relay Ry1 has returned in step S5, the processing unit 22 issues an instruction to add to the protective relay Ry1 a voltage output whose level decreases at a rate smaller than the second rate (third rate) described above. 1 (step S6). After step S6, the processing unit 22 determines whether or not the voltage output value has reached the lower limiter (step S7). If the lower limit has not been reached in step S7, the processing unit 22 determines from the operation result from the tester 1 whether or not the protective relay Ry1 has been operated again (step S8). If it is determined in step S8 that the protective relay Ry1 is not operating, the processing unit 22 returns the process to step S6. If it is determined in step S8 that the protective relay Ry1 has been operated, the processing unit 22 sets the value of the voltage output at the time of operation as an operating voltage, and adds this operating voltage only for the operation confirmation time (step S9). Is determined from the operation result from the tester 1 (Step S10).

  If it is determined in step S10 that the protective relay Ry1 has operated stably, the value of the operating voltage in step S9 is stored in the storage unit 23 together with identification information representing the protective relay Ry1 as a relay operating value (step S11).

  On the other hand, if the protective relay Ry1 does not operate stably in step S10, the processing unit 22 returns the process to step S6. If the lower limit is reached in step S7, the processing unit 22 outputs a test result indicating that the protective relay Ry1 is malfunctioning to the input / output unit 24 (step S12).

  Thus, the processing unit 22 performs a process of decreasing the voltage output value starting from the theoretical value, but conversely also performs a process of increasing the voltage output value. In this case, the process of FIG. 2 and FIG. 3 may be performed by replacing “decrease” with “increase” and “increase” with “decrease”. .

  The above is the configuration of the protective relay test system according to this embodiment. Next, a test method for the protective relay using the protective relay test system will be described.

  After connecting the protective relay Ry1 and the controller 2 to the tester 1, the operator operates the input / output unit 24 of the controller 2 and inputs the theoretical value of the protective relay Ry1 and an instruction to start the test. When the processing unit 22 of the controller 2 receives the theoretical value of the protective relay Ry1 and the test start instruction in step S1, the test unit 1 gives an instruction to add a voltage output whose level is reduced to the protective relay Ry1 by the process of step S2. Put out. As a result, the voltage output shown in FIG. 4 is applied to the protective relay Ry1. That is, as shown in point 1 (position indicated by a number in a circle in the figure) which is a measurement start position, the theoretical value is a test start value, and from point 1, voltage output whose level decreases at a first rate. Is added from the tester 1 to the protective relay Ry1.

  Thereafter, when the protection relay Ry1 operates at point 2 in FIG. 4, the processing unit 22 detects the operation of the protection relay Ry1 in the process of step S3, and outputs the voltage output whose level increases in the process of step S4. An instruction to be added to Ry1 is given to the tester 1. The hatched portion in FIG. 4 represents a range where the protective relay Ry1 starts to operate. According to an instruction to the tester 1, a voltage output increasing at a second rate from the point 2 is applied to the protective relay Ry1. That is, between point 1 and point 2, the processing unit 22 confirms whether or not the protective relay Ry1 operates. For this reason, the first ratio may be a value whose level changes at such a speed that the operation of the protective relay Ry1 can be confirmed.

  When the protection relay Ry1 returns again at point 3 in FIG. 4 after the process of step S4, the processing unit 22 detects the return of the protection relay Ry1 in the process of step S5. That is, between the points 2 and 3, the processing unit 22 returns the protective relay Ry1 again. For this reason, the second ratio may be a value whose level changes at such a speed that the recovery of the protective relay Ry1 can be confirmed, and the first ratio or less is suitable as this value.

After the process of step S5, the processing unit 22 gives an instruction to the tester 1 to add a voltage output whose level is decreased to the protective relay Ry1 in the process of step S6. As a result, a voltage output that decreases at a third rate from point 3 in FIG. 4 is applied to the protective relay Ry1. Thereafter, when the voltage output value has not reached the lower limiter in the process of step S7, if the protective relay Ry1 operates at point 4 in FIG. 4, the processing unit 22 detects the operation of the protective relay Ry1 in the process of step S8. To do. That is, between point 3 and point 4, the processing unit 22 detects an operation value at which the protective relay Ry1 starts operating, that is, a relay operation value. Although only whether or not the protective relay Ry1 operates is detected between the points 1 and 2, it is necessary to reliably detect the relay operation value at which the protective relay Ry1 starts operating from the point 3 to the point 4. For this reason, the third ratio is compared to the first ratio and the second ratio,
It is necessary to set a value such that the first ratio ≧ the second ratio> the third ratio, that is, a value at which the level of the voltage output gradually changes.

  After the process of step S8, the processing unit 22 adds the operation voltage of the relay operation value of the protective relay Ry1 for the operation confirmation time in the process of step S9, and the protective relay Ry1 continues to operate stably in the process of step S10. Detect whether or not. That is, the time from point 4 to point 5 is the operation confirmation time. When the protective relay Ry1 operates stably between point 4 and point 5, the processing unit 22 stores the operating voltage of the protective relay Ry1 in step S11. If the protective relay Ry1 does not perform a stable operation between point 4 and point 5, the processing unit 22 returns the process to step S6.

  By the way, when the operation of the protective relay Ry1 cannot be confirmed by the processing of FIG. 2 and FIG. 3, the operator operates the input / output unit 24, for example, and performs processing reverse to the processing of FIG. Thereby, when the operation value of the protective relay Ry1 is on the plus side of the theoretical value, the test of the protective relay Ry1 is performed.

  The above is the protection relay test method using the protection relay test system according to this embodiment. According to this embodiment, it is possible to automatically perform the test of the voltage characteristic of the protective relay Ry1, that is, the determination of the quality of the protective relay Ry1, the detection of the relay operation value of the protective relay Ry1, and the like. Thus, it is possible to prevent the dependence on the worker's working method as in the prior art, and an accurate test of the voltage characteristic of the protective relay can be performed by anyone. Further, conventionally, the operator has operated the voltage output adjustment dial of the tester 1 to apply a voltage output to the protective relay Ry1, but in this embodiment, all are performed automatically. This eliminates the need for the operation 1 and shortens the voltage characteristic test time. Furthermore, since the test is started from the theoretical value, when the protective relay Ry1 operates at the theoretical value, the time from point 1 to point 2 in FIG. 4 is shortened, and the test time of the protective relay Ry1 can be shortened. .

  Further, in this embodiment, the processing of FIG. 2 and FIG. 3 and the processing reverse to this processing are performed, but the order of performing processing reverse to the processing of FIG. 2 and FIG. 2 and the process opposite to the process of FIG. 3 may be automatically switched.

(Embodiment 2)
The protection relay test system according to this embodiment is an example in which the current characteristics of the protection relay are tested. Note that the protection relay test system according to this embodiment is different only in the program stored in the storage unit 23 of the first embodiment described above, so that the protection according to this embodiment is described with reference to FIG. A relay test system will be described.

  In the protective relay Ry1, a set value of the operating current, that is, a theoretical value is set in advance. The storage unit 23 of the controller 2 stores a program related to the test of the processing unit 22 and stores a test result performed by the processing unit 22. In addition, the storage unit 23 stores in advance the allowable range of the actual operating current with respect to the theoretical value of the protective relay Ry1, and stores the upper limit value and the lower limit value of the allowable range as limiters. The limiter which is the upper limit and the lower limit is set to the limit point of the pass / fail range of the protective relay Ry1. Further, the upper limiter is a limit point of the upper limit of the current value that flows to the protective relay Ry1, and prevents unnecessary overcurrent from flowing when the protective relay Ry1 is inspected.

  The processing unit 22 performs the tests shown in FIGS. 5 and 6 according to the program stored in the storage unit 23. In FIG. 5 and FIG. 6, the same processes as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. In this embodiment, the processing unit 22 controls the tester 1 to continuously change the current level by sweeping. Since the protective relay Ry1 operates when the detected current increases, the protection relay Ry1 starts with a sweep that increases the current level. When the processing unit 22 receives the theoretical value and the test start instruction for the protective relay Ry1 from the input / output unit 24 (step S51), the processing unit 22 sets the theoretical value as the test start value and sets a predetermined ratio (the first number) An instruction to flow a current output whose level increases from the theoretical value at a ratio of 1 to the protective relay Ry1 is issued (step S52). After step S52, the processing unit 22 determines whether or not the protective relay Ry1 is operated from the operation result from the tester 1 (step S53).

  If the protective relay Ry1 does not operate in step S53, the processing unit 22 determines whether or not the current output value has reached the upper limiter (step S54). If the current output value does not reach the limiter in step S54, the processing unit 22 returns the process to step S52. When the current output value reaches the limiter, the processing unit 22 returns to a predetermined ratio (first time). The ratio is sent from the limiter to the protective relay Ry1 (step S55). After step S55, the processing unit 22 determines whether or not the protective relay Ry1 is operated from the operation result from the tester 1 (step S56). When the processing unit 22 determines that the protection relay Ry1 has been operated, the processing unit 22 performs the processing after step S4 of the first embodiment. In this embodiment, the process of replacing “voltage” in step S4 and subsequent steps with “current” is performed.

  On the other hand, when the processing unit 22 determines that the protective relay Ry1 is operated in step S53, the processing unit 22 issues an instruction to flow the current output whose level is decreased at a rate smaller than the first rate (second rate) to the protective relay Ry1. 1 (step S57). After step S57, the processing unit 22 determines whether the protective relay Ry1 has returned from the operation result from the tester 1 (step S58). If it is determined in step S58 that the protective relay Ry1 has not been restored, the processing unit 22 returns the process to step S57.

  When the processing unit 22 determines that the protective relay Ry1 has returned in step S58, the processing unit 22 instructs the tester 1 to flow the current output whose level increases at a rate smaller than the second rate (third rate) to the protective relay Ry1. (Step S59). After step S59, the processing unit 22 determines whether or not the protective relay Ry1 operates again from the operation result from the tester 1 (step S60). When it is determined in step S60 that the protective relay Ry1 is not operating, the processing unit 22 returns the process to step S59. If it is determined in step S60 that the protective relay Ry1 has been operated, the processing unit 22 performs the processing after step S8 of the first embodiment. In this embodiment, the process of replacing “voltage” after step S8 with “current” is performed.

  Further, when determining that the protective relay Ry1 does not operate in step S56, the processing unit 22 determines whether or not the value of the current output has reached the lower limiter (step S61). If the processing unit 22 determines that the value of the current output has not reached the lower limiter, the processing unit 22 returns the process to step S55. Further, when determining that the value of the current output has reached the lower limit in step S61, the processing unit 22 outputs a test result indicating an operation failure of the protective relay Ry1 to the input / output unit 24 (step S62).

  The above is the configuration of the protective relay test system according to this embodiment. Next, a test method for the protective relay using the protective relay test system will be described.

  After connecting the protective relay Ry1 and the controller 2 to the tester 1, the operator operates the input / output unit 24 of the controller 2 and inputs the theoretical value of the protective relay Ry1 and an instruction to start the test. When the processing unit 22 of the controller 2 receives the theoretical value of the protective relay Ry1 and the test start instruction in step S51, the test unit 1 gives an instruction to flow a current output whose level increases to the protective relay Ry1 by the process of step S52. Put out. As a result, the theoretical value is set as the test start value as indicated by point 11 in FIG. 7, and from point 11, a current output whose level increases from the theoretical value at the first rate flows from the tester 1 to the protective relay Ry1. That is, the first ratio may be a value at which the level increases at such a speed that the operation of the protective relay Ry1 can be confirmed.

  Thereafter, when the current output reaches the upper limit limiter in the state where the protective relay Ry1 is not operated by the processing of step S53 and step S54, the processing unit 22 outputs the current output whose level is reduced by the processing of step S55. An instruction to flow to Ry1 is given to the tester 1. That is, when the current output reaches the point 12 in FIG. 7, the current output whose level decreases from the upper limiter at the first rate from the point 12 flows from the tester 1 to the protective relay Ry1. Thereafter, when the protective relay Ry1 operates at the point 13 in FIG. 7, the processing unit 22 detects the operation of the protective relay Ry1 in the process of step S56, and thereafter the point 2 to the point 5 in FIG. 4 of the first embodiment. In the same manner, a current output as indicated by points 13 to 16 in FIG. 7 flows to the protective relay Ry1. Thereby, after obtaining the value of the operating current at which the protective relay Ry1 operates stably, the quality of the protective relay Ry1 is determined.

  By the way, when the protective relay Ry1 is operated at the point 22 by the current output increased from the point 21 by the processing of the step S51 and the step S52 as shown in FIG. The tester 1 is instructed to flow the decreasing current output to the protective relay Ry1. After the process of step S57, when the protective relay Ry1 returns again at point 23 in FIG. 8, the processing unit 22 detects the return of the protective relay Ry1 in the process of step S58. That is, between the point 22 and the point 23, the processing unit 22 returns the protective relay Ry1 again. For this reason, the second ratio may be a value at which the level decreases at such a speed that the return of the protective relay Ry1 can be confirmed, and this value is equal to or less than the first ratio as in the first embodiment. Is suitable.

After the process of step S58, the processing unit 22 issues an instruction to the tester 1 to flow a current output whose level increases to the protective relay Ry1 in the process of step S59. As a result, a current output that increases at the third rate flows from the point 23 in FIG. 8 to the protective relay Ry1. Thereafter, when the protective relay Ry1 operates at the point 24 in FIG. 8, the processing unit 22 detects the operation of the protective relay Ry1 in the process of step S60. That is, between the point 23 and the point 24, the processing unit 22 detects a relay operation value at which the protection relay Ry1 starts to operate. Only whether or not the protective relay Ry1 operates between the points 21 and 22 is detected. However, at the points 23 to 24, as in the first embodiment, the relay operation value at which the protective relay Ry1 starts to operate is set. It needs to be detected reliably. For this reason, as in the first embodiment, the third ratio is compared to the first ratio and the second ratio.
It is necessary to set the current output level to a value that gradually changes so that the first ratio ≧ the second ratio> the third ratio.

  After step S60, like the points 4 to 5 in FIG. 4 of the first embodiment, the operating current as shown by the points 24 to 25 in FIG. 8 flows as a current output to the protective relay Ry1.

  The above is the protection relay test method using the protection relay test system according to this embodiment. According to this embodiment, it is possible to automatically check the current characteristics of the protective relay Ry1, that is, determine the quality of the protective relay Ry1, detect the relay operation value of the protective relay Ry1, and the like. As a result, it is possible to prevent dependence on the worker's working method as in the past, and to accurately check the current characteristics of the protective relay. Further, conventionally, the operator operates the dial for adjusting the current output of the tester 1 to add the current output to the protective relay Ry1, but in this embodiment all the operations are performed automatically. The operation of 1 can be eliminated and the current characteristic check time can be shortened. Furthermore, since the test is started from the theoretical value, when the protective relay Ry1 operates at the theoretical value, the time from the point 11 to the point 13 in FIG. 7 is shortened, and the test time of the protective relay Ry1 can be shortened. .

  The embodiment of the present invention has been described in detail above, but the specific configuration is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the first embodiment, the current characteristic of the protective relay Ry1 is tested, and in the second embodiment, the current characteristic is tested. However, the present invention has various characteristics such as temperature characteristics, voltage phase characteristics, and current characteristics. It can also be applied to a phase characteristic test.

  In the first embodiment and the second embodiment, the protection relay test program for performing the protection relay test method is stored in the storage unit 23 of the controller 2 in advance, but this program is recorded on a recording medium. In this recording medium, the controller 2 may introduce a test program for the protective relay.

  Furthermore, in the second embodiment, the current output is increased at a first rate between points 11 and 12 in FIG. 7, and the current output is also increased at a first rate between points 12 and 13 in FIG. Although reduced, the rate of increasing current and the rate of decreasing may be different values.

1 is a configuration diagram illustrating a protection relay test system according to Embodiment 1. FIG. 3 is a flowchart illustrating processing of a processing unit according to the first embodiment. 3 is a flowchart illustrating processing of a processing unit according to the first embodiment. 6 is an explanatory diagram illustrating an operation of a processing unit according to Embodiment 1. FIG. 10 is a flowchart illustrating processing of a processing unit according to the second embodiment. 10 is a flowchart illustrating processing of a processing unit according to the second embodiment. FIG. 10 is an explanatory diagram for explaining an operation of a processing unit according to the second embodiment. FIG. 10 is an explanatory diagram for explaining an operation of a processing unit according to the second embodiment.

Explanation of symbols

1 Tester 2 Controller 21 Interface 22 Processing Unit 23 Storage Unit 24 Input / Output Unit Ry1 Protection Relay

Claims (9)

A first process for changing the level of the test voltage / current applied to test the protective relay in a certain direction;
When the protective relay operates in the first process, a second process for changing the test voltage / current level in the opposite direction to the first process;
When the protective relay is restored in the second process, the test voltage / current level is set in the opposite direction to the second process and the speed of the test voltage / current level change by the second process. Compared to the third process that changes slowly,
When the protection relay operates in the third process, the test voltage / current at the time of this operation is given to the protection relay for a predetermined time, and when the protection relay operates stably, the value of the test voltage / current A fourth process with the operating value of the protective relay as
A test method for a protective relay, comprising:   2. The protective relay according to claim 1, wherein whether or not the protective relay is good is determined based on whether or not the operation value obtained in the fourth process is within a preset allowable range of the protective relay. Test method.   The method for testing a protective relay according to claim 1 or 2, wherein an initial level of the test voltage / current by the first processing is set to a set value preset in the protective relay.   The voltage output starting from a set value in the first processing is set as the test voltage / current when the test is a voltage characteristic test, and the voltage output is decreased. Test method for the protective relay as described.   4. The method according to claim 3, wherein when the test is a current characteristic test, a current output starting from a set value in the first processing is set as the test voltage / current, and the current output is increased. Test method for the protective relay as described.   6. The protective relay test according to claim 5, wherein a limiter is set for the settling value, and the current output is decreased when the current output by the first processing reaches the limiter. Method. A first process for changing the level of the test voltage / current applied to test the protective relay in a certain direction;
When the protective relay operates in the first process, a second process for changing the test voltage / current level in the opposite direction to the first process;
When the protective relay is restored in the second process, the test voltage / current level is set in the opposite direction to the second process and the speed of the test voltage / current level change by the second process. Compared to the third process that changes slowly,
When the protection relay operates in the third process, the test voltage / current at the time of this operation is given to the protection relay for a predetermined time, and when the protection relay operates stably, the value of the test voltage / current A fourth process with the operating value of the protective relay as
A test program for a protective relay, comprising:   A computer-readable recording medium in which the test program for the protective relay according to claim 7 is recorded. In a test system for a protective relay comprising: a tester that outputs a test voltage / current for testing the protective relay; and a controller that controls the output of the tester.
The controller is
A first instruction is given to the tester to change the test voltage / current level applied to test the protective relay in a certain direction,
When the protection relay operates with the test voltage / current output from the tester according to the first instruction, a second instruction for changing the level of the test voltage / current in the reverse direction is issued to the tester,
When the protective relay is restored with the test voltage / current output from the tester according to the second instruction, the test voltage / current level is reversed and the test voltage / current level changes quickly. 3rd instruction to change slowly compared to
When the protective relay operates at the test voltage / current output from the tester according to the third instruction, the test voltage / current at the time of operation is applied to the protective relay for a predetermined time, and the protective relay is stabilized. When operating, make this test voltage / current value the operating value of this protective relay,
Protection relay test system characterized by.

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