JP2010048676A - Method for conducting protective cooperation test of protective relay, and tester used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for conducting a protective cooperation test of a plurality of stages of protective relays which easily and surely confirms an operation test conducted by a relay test in a close to actual operation, by cooperating with a plurality of the stages of the protective relays, and to provide its tester. <P>SOLUTION: In the cooperation test of a plurality of the upper and lower protective relays 2, 3 in a power transmission system, relay testers 4, 5 are connected to the protective relays 2, 3. Protective cooperation testers 6 or 7 are connected to the relay testers 4, 5 so as to control operations of the relay testers 4, 5. The protective cooperation testers are interconnected by signal lines 6a, 7a so as to control the operations of the relay testers 4, 5 by using one of the protective cooperation testers 6 or 7, and a cooperative operation test between protective relays is conducted, by carrying a test current from the relay testers 4, 5 to the protective relays 2, 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cooperative test method for a plurality of upper and lower protection relays in a power transmission system and a test apparatus used therefor.

  In recent years, load facilities such as information equipment and precision equipment have become more sophisticated, and the need for power supply reliability is increasing. In order to improve the reliability of electrical equipment in the transmission system, even if an accident occurs, quickly isolate the failure location, localize the affected area such as a power failure, and supply power to other healthy circuits We are taking protection coordination so that we can continue.

  Currently, to confirm the protection coordination, plot the operation characteristics of the upper and lower protection relays from the catalog, fill in the graph, create a protection coordination curve diagram on the desk, consider the protection coordination, and actually The relay tester is connected to each protection relay, the performance test of the protection relay is performed, and it is confirmed on the desk whether or not the protection coordination of the multistage protection relay is taken based on the result. .

  However, in rare cases, settling errors and safety factors are too small to be coordinated, and when a short-circuit accident actually occurs, the upper circuit breaker operates and the power failure range is expanded, causing unexpected damage. There is. Although there are various causes of the accident, there are power consumers who are worried about protection coordination because the actual operation level cannot be confirmed.

  Patent Document 1 shows an example of a test method and a test apparatus for a single relay.

JP 2007-173029 A

  Therefore, the present invention cannot be confirmed by operating an actual short-circuit current, but it can be confirmed in a state close to actual operation by coordinating the operation test performed in the relay test with a plurality of protective relays. It is an object of the present invention to provide a protection coordination test method and apparatus for a multi-stage protection relay that can be easily and reliably solved.

  The invention of claim 1 is a coordinated test of a plurality of upper and lower protection relays in a power transmission system, wherein a protection tester for connecting a relay tester to each protection relay and controlling the operation of each relay tester is provided. Connect to each relay tester, connect these protection coordination testers with signal lines, operate and control each relay tester with one protection coordination tester, and send test current from each relay tester to each It was set as the test method which flows through a protection relay and performs a cooperation interlocking test between each protection relay.

  In the invention of claim 2, in a cooperative test of a plurality of upper and lower protection relays in a power transmission system, a relay tester connected to each protection relay is provided with a protection cooperation tester for controlling the operation of each relay tester. Connect to each tester, connect these protection coordination testers with signal lines, operate and control each relay tester with one protection coordination tester, and send the test current from each relay tester to each protection relay The protection coordination test device is configured to perform a cooperative interlocking test between the protection relays.

  According to a third aspect of the present invention, in the protection coordination test apparatus according to the second aspect, the protection coordination tester selects a single test of a protection relay connected to each connected relay tester, a test current value setting, and the coordination interlock test. It was set as the protection cooperation test apparatus which was set as the structure which can be performed automatically.

  According to a fourth aspect of the present invention, in the protection coordination test apparatus according to the second or third aspect, the signal line connection of each protection coordination tester is connected to the signal line end derived from each protection coordination tester of the transmission system. A protection coordination test device connected to the electric cable was used.

  According to a fifth aspect of the present invention, in the apparatus according to any one of the second, third, and fourth aspects, each of the protection cooperative testers includes a start display on its own tester, a start display on another machine, a self trip display, and others. The protection coordination test apparatus according to (1), characterized in that means for displaying a trip display of the machine is provided.

  In the first and second aspects of the invention, it is possible to accurately determine whether or not protection coordination is possible by actually operating relay testers of a plurality of protective relays simultaneously at different sites. In particular, even if it is subtle whether or not data is close on the conventional graph and whether protection cooperation is taken, whether or not protection cooperation is possible can be determined by an actual test using this apparatus, and quality can be improved. In addition, since the test is performed with the final set value, it is possible to prevent malfunction due to a setting value error. In addition, since different currents can be set for the upper and lower protection relays, it is possible to test by adding the current assumed in the branch to the upper level. Therefore, it can contribute to the stable supply of electric power. In addition, conventionally, a single unit test and a set value test were performed at the time of completion of the protective relay, and a set value test was performed at the time of inspection. Simplify test standards.

  Furthermore, the protection tester of the present invention is connected to the relay tester that has been generally used in the past, and communication between these protection testers can be connected by signal lines, and the device can be prepared very easily. I can do it.

  In addition, according to the invention of claim 3, it is possible to selectively perform a single test of each protective relay connected to each relay tester and a test current. According to the invention of claim 4, even if the upper and lower protection relays are separated, the core of the high-voltage cable during power failure is used as the signal transmission means of the upper and lower devices. Thus, it is possible to omit the laying of signal lines between the plurality of apparatuses, and it is not necessary to separately route long signal lines.

  In the invention of claim 5, since each protection coordination tester is provided with means for displaying a start display in its own testing machine, a start display of another machine, a self trip display, and a trip display of another machine, the operator It can be confirmed visually, and it is possible to confirm whether or not the protection coordination of the protection relays of a plurality of stages is achieved with one of the plurality of protection coordination testers, and the confirmation of the test is easy.

  In this invention, in a cooperative test of a plurality of upper and lower protection relays in a transmission system, a relay tester is connected to each protection relay, and the protection tester for controlling the operation of each relay tester is connected to each relay test. Connect to each tester, connect these protection coordination testers with signal lines, operate and control each relay tester with one protection coordination tester, and send the test current from each relay tester to each protection relay. The test method was to conduct a cooperative interlocking test between each protective relay.

  Thereby, the cooperation test of a plurality of upper and lower protection relays can be confirmed by actual operation, and the reliability related to protection cooperation is improved.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing an outline of the protection coordination test of the present invention.
In the case where the high-voltage cable 1 of the transmission system has the upper overcurrent relay (OCR) 2 and the lower circuit breaker (CB) 3, the relay testers 4 and 5 are connected to the overcurrent relay 2 and the circuit breaker 3, respectively, as before. Then, the protection cooperative testers 6 and 7 are connected to the relay testers 4 and 5, respectively.

  Each of these protection coordination testers 6 and 7 can control the operation of the relay testers 4 and 5 connected thereto, and the mutual communication between these protection coordination testers 6 and 7 The tips of the communication lines 6a and 7a led out from the devices 6 and 7 are connected to the core wire of the high-voltage cable 1, and one of the relay coordination tests 6 or 7 is used for each relay test. The operation of the devices 4 and 5 can be controlled, and by operating the one protection cooperative tester 6 or 7, a test current is simultaneously supplied from the relay testers 4 and 5 to the overcurrent relay 2 and the circuit breaker 3, Which of the upper overcurrent relay 2 and the lower circuit breaker 3 is operated first is displayed, and a cooperative interlocking test between the protective relays is performed.

  Further, the protection coordination tester 6 or 7 can selectively perform the individual test of the overcurrent relay 2 or the circuit breaker 3 and the setting of each test current by the relay testers 4 and 5.

  Next, FIG. 2 is a block diagram of the protection coordination tester 6 of the present invention, and FIG. 3 is a plan view of the panel of the protection coordination tester 6. Since the protection coordination tester 7 has the same structure as the protection coordination tester 6, a description thereof will be omitted.

  The protection coordination tester 6 has an AC 100V power input connector 8, and this connector 8 also shares the power source of the relay tester 4 or 5. A power switch 9 is provided following the power input connector 8. Further, a power-on lamp 10 that is turned on when the power switch 9 is turned on is provided. Further, a main body and a DC power supply circuit 11 for signal input / output are provided on the output side of the power switch 9, and control and detection of the self-other protection cooperative tester and the relay tester supplied with power from the DC power supply circuit 11. A control CPU board 12 is provided.

  Further, on the output side of the power switch 9, a connection relay tester power on / off control circuit 13 is provided in parallel with the DC power circuit 11, and further a power supply / state / displacement detection circuit 14 for the relay tester is provided, This is connected to the relay tester power connector 15. The relay tester 4 or 5 and the protection cooperative tester 6 are connected via the relay tester power connector 15. In addition, the relay tester power supply / state / displacement detection circuit 14 is connected in parallel with the relay tester power supply connector 15 via the connection relay tester start / stop control circuit 16 to the relay tester auxiliary power connector 17. Is provided. The relay tester auxiliary power connector 17 serves as both a start (output) control for the relay tester and an input power supply for the auxiliary power supply of the main body.

  The connection relay tester start and stop control circuit 16 is connected to an auxiliary power connector 19 via an auxiliary power switch 18, and the auxiliary power switch 18 is an on / off switch for an auxiliary power supply for a relay. 5A NFB is provided. The auxiliary power connector 19 is for auxiliary power (AC100V) for the GR / DGR and DC control relay. In addition, the circuit breaker operation detection circuit (a / b contact automatic detection) and the TRIP detection insulated DC power supply circuit 20 are connected to the control and detection control CPU board 12 of the self-other protection cooperative tester and the relay tester. This is connected to the circuit breaker interlocking detection connector 21. This circuit breaker interlocking detection connector 21 is for detecting contact operation of an overcurrent relay (OCR) interlocking circuit breaker (CB).

  Further, the control and detection control CPU board 12 for the self-other protection cooperative tester and the relay tester is connected to a start and stop start / stop control circuit 22 for the connection relay tester and the other protection cooperative tester. Are provided with a start switch 22a and a stop switch 22b. In addition, the control / detection control CPU board 12 of the self-other protection cooperative tester and relay tester is connected to a single unit / setting / interlocking test select circuit 23 in a connection relay tester, and to this single unit / setting / interlocking tester. A test changeover switch 23a is provided.

  Further, the control / detection control CPU board 12 of the self-other protection cooperative tester and the relay tester is connected to a state / displacement detection and control signal output circuit 24 of another protection cooperative tester, which is connected to the control signal. An input / output connector 25 is connected. As a result, signal input / output with other protection cooperative tester, control of the self-other protection cooperative tester, and PL display described later are performed. The signal line 6a or 7a is connected to the control signal input / output connector 25. Further, the control and detection control CPU board 12 of the self-other protection cooperative tester and the relay tester is connected to a test preparation state display and test result display circuit 26 of the self-other protection cooperative tester and the connection breaker. .

  The test preparation status display and test result display circuit 26 of the self-other protection cooperative tester and the connection breaker is provided with alarm lamps and display lamps from PL-A to PL-I. PL-A is an alarm lamp that lights when the relay tester is not turned on. If this is lit, the test cannot be performed when the auxiliary power switch on the relay tester is off. PL-B is an alarm lamp that lights when TRIP.T (CB) is open. This alarms when the tip of the trip code is open (a contact). PL-C is an alarm lamp that is lit when a control signal voltage improper connection is detected. When this is lit, it indicates that a voltage of 36V or more is applied between E-IN and E-OUT of the control signal line.

  The PL-D is a warning lamp that lights up when it is confirmed that all preparations for the coordinated interlocking test of its own protection coordination tester have been completed and the preparation is not completed. This is an alarm when the code corresponding to the IN code seen from the self-machine side is not connected or disconnected. PL-E is an alarm lamp that lights up when it is confirmed that all the preparations for the cooperative coordination test of the protection coordination tester of the other machine have been completed, and the preparation is not complete. This alarms when the other machine code corresponding to the IN code seen from the own machine side is not connected or disconnected. In addition, these PL-D and PL-E also give a lighting warning even when the changeover switch on the own machine and the other machine is not “highlighted”.

PL-F is a display lamp that lights up when the relay tester is activated by “Start” on its own machine in the cooperative interlocking test. PL-G is an indicator lamp that lights up when the relay tester is activated by “Start” on another machine in the cooperative interlocking test. PL-H is an indicator lamp that lights up when the relay tester stops due to the “TRIP detection” of its own device in the coordinated interlocking test. PL-I is a display lamp that lights up when the relay tester is stopped by "TRIP detection" of another machine in the cooperative interlocking test.
In the figure, PL2 is a start lamp that lights in conjunction with the start output of the relay tester, and IN, E, and OUT are fuse holders for protective fuses provided in the control signal input / output connector 25. Further, a polarity confirmation lamp 27 is provided between the power input connector 8 and the power switch 9 to confirm the power polarity.

  With the above configuration, after the test circuit is connected, it is confirmed that the five alarm lamps PL-A to PL-E are turned off, and the upper overcurrent relay 2 and the lower circuit breaker 3 From either the protection coordination tester 6 or another protection coordination tester 7, the start switch 22a is pushed to pass a test current. Here, the relay of the overcurrent relay 2 operates, and the circuit breaker 3 also operates in conjunction. At this time, check the display lamps PL-F to PL-I.

  The result of the operation in such an interlock test is displayed on the display lamps PL-F to PL-I. The operation pattern is as shown in the following table.

  When operation pattern 1 starts on the own machine side and the own machine side relay (CB) operates, operation pattern 2 starts on the own machine side and the other machine side relay (CB) operates When operation pattern 3 starts on the other machine side and the relay (CB) on the own machine operates, operation pattern 4 starts on the other machine side and the relay (CB) on the other machine operates. This is the case.

  Further, the difference in operation time between the two protection coordination testers 6 and 7 at the time of the protection coordination test (the time difference between the start time and the stop time) is 1 msec or less from the result of the characteristic test. The accuracy of the time lag (operation time difference) is 0.5 to 0.8 msec. In addition, there are nine alarm lamps and indicator lamps, including the self-status, for the status of other protection coordination testers at remote locations such as the main substation and sub-substations. Communication with other operators can be communicated by checking the preparatory operation of the cooperative tester and the monitor display. In particular, the timing of completion of preparation before the test and start of the test can be measured. Further, since the power source polarity confirmation lamp 27 is provided, a safer and more reliable test can be performed.

In the first embodiment, an example is shown in which an overcurrent relay (OCR) is provided in the upper part of the transmission system and a breaker (CB) is provided in the lower part. However, the present invention is not limited to these, and various relays are provided in multiple stages. It can be used for protection coordination tests of these multi-stage relays in the case of a power transmission system. In the first embodiment, communication between the protection coordination testers 6 and 7 is performed via a high voltage cable. However, when a plurality of protection relays to be tested are nearby, these protection coordination testers are connected to the communication line. You may connect directly.
In addition, a voice function can be added to the communication between the protection cooperative testers of the first embodiment, so that verbal communication is possible even in the basement or higher floor where the mobile phone cannot be used.

It is a block diagram which shows the outline | summary of the protection cooperation test of Example 1 of this invention. It is a schematic block diagram of the protection cooperation tester used for the protection cooperation test of Example 1 of this invention. It is a top view of the panel of the protection cooperation tester used for the protection cooperation test of Example 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High voltage cable 2 Overcurrent relay 3 Circuit breaker 4 Relay tester 5 Relay tester 6 Protection coordination tester 7 Protection coordination tester 8 Power input connector 9 Power switch 10 Power-on lamp 11 DC power supply circuit
12 Control and detection control of self-other protection cooperative tester and relay tester CPU board 13 Connection relay tester power on / off control circuit 14 Power supply / state / displacement detection circuit of relay tester
15 Relay Tester Power Connector 16 Connection Relay Tester Start and Stop Control Circuit 17 Relay Tester Auxiliary Power Connector 18 Auxiliary Power Switch 19 Auxiliary Power Connector 20 Connection Breaker Operation Detection Circuit (a / b Contact Automatic Detection) and TRIP Detection Isolation DC power supply circuit 21 Breaker interlock detection connector 22 Start and stop start / stop control circuit 23 for connection relay tester and other protection coordination tester Single unit / setting / interlocking test select circuit 24 for connection relay tester Other protection coordination Test device status / displacement detection and control signal output circuit 25 Control signal input / output connector 26 Test preparation status display and test result display circuit of self-other protection cooperative tester and connection breaker

Claims (5)

In coordinated testing of multiple upper and lower protection relays in the transmission system,
Connect a relay tester to each protection relay, connect a protection coordination tester that controls the operation of each relay tester for each relay tester, and connect these protection coordination testers to each other via signal lines. Operation control of each relay tester with a single protection coordination tester, a test current is sent from each relay tester to each protection relay, and a cooperative interlocking test between each protection relay is performed. Method. In coordinated testing of multiple upper and lower protection relays in the transmission system,
A protection tester that controls the operation of each relay tester is connected to each relay tester to each relay tester connected to each protection relay. The operation of each relay tester is controlled and controlled by a protection coordination tester, and a test current is passed from each relay tester to each protection relay to perform a cooperative interlocking test between the protection relays. Protection coordination test equipment.   The protection coordination tester is configured to be able to selectively perform a single test, a test current value setting and the coordination interlock test of a protection relay connected to each connected relay tester. 2. The protection coordination test apparatus according to 2.   4. The protection coordination test according to claim 2, wherein the signal line connection of each protection coordination tester connects a signal line end derived from each protection coordination tester to an electric cable of the power transmission system. 5. apparatus.   Each of the protection coordination testers is provided with means for displaying a start display in its own tester, a start display of another machine, a trip display of its own machine, and a trip display of another machine. The protection coordination test apparatus according to any one of 3 and 4.

Images