CN108663591B - Equipment and method for verifying control logic and control time sequence of controllable lightning arrester - Google Patents
Equipment and method for verifying control logic and control time sequence of controllable lightning arrester Download PDFInfo
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Abstract
The invention relates to a device and a method for verifying the control logic and the control sequence of a controllable lightning arrester, comprising: the main line loop is switched on through a breaker at the low-voltage side of the transformer, switching-on and switching-off operation overvoltage is generated at the high-voltage side of the transformer and is applied to the controllable lightning arrester, and deep suppression of the operation overvoltage at the high-voltage side of the transformer is realized through the matching of the breaker and a control switch of the controllable lightning arrester; the control loop is connected with a delay relay in series after a breaker closing outlet of the station control loop to finish the delay starting of the breaker closing loop at the low-voltage side of the transformer; the switching-on and switching-off of the control switch are controlled by adding a control switch of a controllable lightning arrester to the station control loop and controlling the remote control outlet. And judging the control logic of the control switch and the circuit breaker and the accuracy of the control time sequence according to the test result through the remote signaling signal, the remote control signal and the control time sequence test. The invention ensures the function realization and reliable operation of the controllable lightning arrester through the verification of the accuracy of the control logic and the control time sequence.
Description
Technical Field
The present invention relates to the field of power system control technology, and more particularly, to an apparatus and method for verifying control logic and control timing of a controllable arrester.
Background
According to the urgent need of an extra-high voltage alternating current transmission system for deeply reducing the level of the operation overvoltage and the defects of the conventional operation overvoltage limiting method in the aspects of economy and operation reliability, the flexible operation overvoltage limiting method is provided. The method has the core that the controllable lightning arrester is installed on the side of the transformer substation line and the conventional lightning arrester is installed in the middle of the line, so that the operation overvoltage is reduced deeply, and the closing resistance of the breaker is eliminated. The controllable lightning arrester technology is the key of a flexible limiting method, and is mainly focused on the research of an extra-high voltage alternating current switch type controllable lightning arrester at present.
The schematic structural diagram of the switching type controllable Arrester scheme is shown in fig. 1, and mainly comprises an Arrester body and a Control Unit, wherein the Arrester body is divided into a fixed element Metal Oxide Arrester 2(Metal Oxide Arrester, MOA) and a controlled element MOA1, the Control Unit (CU) comprises a thyristor valve and a trigger Control system, and the MOA1 and the CU are connected in parallel. The working principle of the thyristor valve type controllable lightning arrester is as follows: (1) under the overvoltage operation, K triggers to be conducted, CU is closed, the MOA1 is in short circuit, the residual voltage of the MOA2 is low, and the overvoltage operation of the system can be deeply reduced. (2) Under the continuous operation voltage, the temporary overvoltage and the lightning overvoltage of the system, the CU is disconnected, and the MOA1 and the MOA2 share the continuous operation voltage, the temporary overvoltage and the lightning overvoltage of the system. The switch type controllable lightning arrester limits the operation overvoltage generated by switching-on and reclosing mainly through switching of a controller on a control switch under different working conditions, so that a circuit breaker cancels a switching-on resistor.
In order to realize the function of limiting switching operation overvoltage, a control unit must be closely matched with a circuit breaker control cubicle and a transformer substation control protection system. The correctness of the control logic and the control time sequence of the control unit is crucial to the function realization and the reliable operation of the switching type controllable lightning arrester. Therefore, a method for verifying the correctness of the control logic and the control sequence of the control unit of the controllable lightning arrester is needed.
Disclosure of Invention
The invention provides equipment and a method for verifying the control logic and the control time sequence of a controllable lightning arrester, which are used for verifying the accuracy of the control logic and the control time sequence of the controllable lightning arrester.
In order to solve the above-mentioned problems, according to one aspect of the present invention, there is provided an apparatus for verifying a control logic and a control timing of a controllable arrester, characterized in that the apparatus comprises: a main line loop and a control loop,
the main line loop includes: the main line loop is switched on through the breaker at the low voltage side of the transformer, switching-on and switching-off operation overvoltage is generated at the high voltage side of the transformer and is applied to the controllable lightning arrester, and deep suppression of the operation overvoltage at the high voltage side of the transformer is realized through the matching of the breaker and a control switch of the controllable lightning arrester;
the control loop completes the delayed start of the breaker closing loop at the low-voltage side of the transformer by connecting a delay relay in series after the breaker closing outlet of the station control loop; a remote control outlet of a control switch of a controllable lightning arrester is added in the station control loop to control the switching-on and switching-off of the control switch.
Preferably, the circuit breaker closing outlet of the station control loop includes: a first normally open node and a second normally open node;
the first normally open node is connected with a hard pressing plate in series and then is connected to a switch of the controllable lightning arrester at an outlet, and the control switch is started;
and the second normally open node is connected with a time delay relay in series, and after the time delay is up to a preset time delay threshold value, the second normally open node passes through the hard pressing plate outlet to the breaker on the low-voltage side of the transformer, and then a breaker closing loop on the low-voltage side of the transformer is started.
Preferably, wherein the apparatus further comprises: and the capacitor voltage transformer is connected with the high-voltage side of the transformer and is used for measuring the voltage of the high-voltage side of the transformer.
Preferably, wherein the apparatus further comprises:
and the disconnecting switch is used for disconnecting the bus and the high-voltage side of the transformer and is isolated from the distribution device at the low-voltage side of the transformer, and the distribution device is connected with the low-voltage side of the transformer through a circuit breaker.
Preferably, the high voltage side of the transformer is 1000kV and the low voltage side of the transformer is 35 kV.
Preferably, the bus bar is provided with an outgoing line, and the outgoing line includes: 1 single-return outlet and two same-tower double-return outlets.
According to another aspect of the invention, there is provided a method for verifying the control logic and control timing of a controllable arrester, characterized in that the method comprises:
carrying out remote signaling signal test, sending switching-on and switching-off position signals of a control switch of the controllable lightning arrester to a station control end, judging whether the station control end can accurately display, and determining a first judgment result;
carrying out remote control signal test, sending a closing command to a control switch of the controllable lightning arrester and the breaker, judging whether the control switch can be normally closed, judging whether the breaker can be normally closed after a preset delay threshold value is reached, and determining a second judgment result;
testing the control time sequence, and respectively calculating the time information of the control switch and the breaker by acquiring the closing and opening position signals of the control switch of the breaker and the controllable arrester, wherein the time information comprises: the switching-on time of the control switch, the switching-off time of the control switch, the switching-on time of the circuit breaker and the switching-on delay time of the circuit breaker are controlled;
and judging the accuracy of the control logic and the control time sequence of the control switch and the circuit breaker according to the first judgment result, the second judgment result and the time information.
Preferably, the determining the accuracy of the control logic and the control sequence of the control switch and the circuit breaker according to the first determination result, the second determination result and the time information includes:
and if the first judgment result is that the display is correct, the second judgment result is that the closing is normal, and the error between the time information and the preset time threshold is smaller than the preset error threshold, determining that the control logic and the control time sequence between the control switch and the circuit breaker are accurate.
The invention provides equipment and a method for verifying control logic and control time sequence of a controllable lightning arrester, which comprises the following steps: the main line loop is switched on through a breaker at the low-voltage side of the transformer, switching-on and switching-off operation overvoltage is generated at the high-voltage side of the transformer and is applied to the controllable lightning arrester, and deep suppression of the operation overvoltage at the high-voltage side of the transformer is realized through the matching of the breaker and a control switch of the controllable lightning arrester; the control loop is connected with a delay relay in series after a breaker closing outlet of the station control loop to finish the delay starting of the breaker closing loop at the low-voltage side of the transformer; a remote control outlet of a control switch of a controllable lightning arrester is added in the station control loop to control the switching-on and switching-off of the control switch. And then, by carrying out remote signaling signal test, remote signaling test and control time sequence test, judging the control logic of the control switch and the circuit breaker and the accuracy of the control time sequence according to the test result. The invention ensures the function realization and reliable operation of the switch type controllable arrester through the verification of the control logic and the accuracy of the control time sequence of the controllable arrester; meanwhile, the switch type controllable lightning arrester also deeply inhibits the operation overvoltage generated by the closing and empty change in the main line loop, can reduce the overvoltage amplitude by about 15 percent, effectively protects the insulation of main line equipment such as a transformer, a voltage transformer and the like, reduces the operation impact flashover rate of outgoing lines, and has important significance for the safe operation of the test loop of the extra-high voltage alternating current test base.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a schematic structural view of a switching type controllable lightning arrester;
fig. 2 is a schematic structural diagram of an apparatus 200 for verifying a control logic and a control timing of a controllable arrester according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of main wiring of an extra-high voltage AC test base test according to an embodiment of the invention;
FIG. 4 is a schematic diagram of an extra-high voltage AC test base control protection loop according to an embodiment of the invention; and
fig. 5 is a flow chart of a method 500 for verifying the control logic and control timing of a controllable arrester according to an embodiment of the invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 2 is a schematic structural diagram of an apparatus 200 for verifying a control logic and a control timing of a controllable arrester according to an embodiment of the present invention. As shown in fig. 2, an embodiment of the present invention provides an apparatus for verifying a control logic and a control timing of a controllable arrester, including: the main line loop is switched on through a breaker at the low-voltage side of the transformer, generates switching-on and switching-off operation overvoltage at the high-voltage side of the transformer, is applied to the controllable lightning arrester, and realizes deep suppression of the operation overvoltage at the high-voltage side of the transformer through the matching of the breaker and a control switch of the controllable lightning arrester; the control loop is connected with a delay relay in series after a breaker closing outlet of the station control loop to finish the delay starting of the breaker closing loop at the low-voltage side of the transformer; a remote control outlet of a control switch of a controllable lightning arrester is added in the station control loop to control the switching-on and switching-off of the control switch. And the accuracy of the control logic and the control time sequence of the control switch and the circuit breaker is judged according to the test result by carrying out remote signaling signal test, remote signaling test and control time sequence test. According to the embodiment of the invention, the function realization and reliable operation of the switch type controllable lightning arrester are ensured through the verification of the control logic and the accuracy of the control time sequence of the controllable lightning arrester; meanwhile, the switch type controllable lightning arrester also deeply inhibits the operation overvoltage generated by the closing and empty change in the main line loop, can reduce the overvoltage amplitude by about 15 percent, effectively protects the insulation of main line equipment such as a transformer, a voltage transformer and the like, reduces the operation impact flashover rate of outgoing lines, and has important significance for the safe operation of the test loop of the extra-high voltage alternating current test base.
The embodiment of the present invention provides an apparatus 200 for verifying a control logic and a control timing of a controllable arrester, comprising: a main line loop 201 and a control loop 202. Preferably, the main line loop 201 includes: the high-voltage side of the transformer is connected with a circuit breaker in series, the high-voltage side of the transformer is connected with a bus, and a controllable lightning arrester is installed on the bus.
Preferably, the control circuit 202 completes the delayed start of the circuit breaker closing loop at the low-voltage side of the transformer by connecting a delay relay in series after the circuit breaker closing outlet of the station control loop; a remote control outlet of a control switch of a controllable lightning arrester is added in the station control loop to control the switching-on and switching-off of the control switch.
Preferably, the circuit breaker closing outlet of the station control loop includes: a first normally open node and a second normally open node;
the first normally open node is connected with a hard pressing plate in series and then is connected to a switch of the controllable lightning arrester at an outlet, and the control switch is started;
and the second normally open node is connected with a time delay relay in series, and after the time delay is up to a preset time delay threshold value, the second normally open node passes through the hard pressing plate outlet to the breaker on the low-voltage side of the transformer, and then a breaker closing loop on the low-voltage side of the transformer is started.
Preferably, wherein the apparatus further comprises: and the capacitor voltage transformer is connected with the high-voltage side of the transformer and is used for measuring the voltage of the high-voltage side of the transformer.
Preferably, wherein the apparatus further comprises: and the disconnecting switch is used for disconnecting the bus and the high-voltage side of the transformer and is isolated from the distribution device at the low-voltage side of the transformer, and the distribution device is connected with the low-voltage side of the transformer through a circuit breaker.
Preferably, the high voltage side of the transformer is 1000kV and the low voltage side of the transformer is 35 kV.
Preferably, the bus bar is provided with an outgoing line, and the outgoing line includes: 1 single-return outlet and two same-tower double-return outlets.
The implementation mode of the invention is implemented in the Wuhan extra-high voltage alternating current test base.
FIG. 3 is a schematic diagram of main wiring of an extra-high voltage AC test base test according to an embodiment of the invention. As shown in fig. 3, a main wiring diagram based on an extra-high voltage ac test base test according to an embodiment of the present invention includes: the transformer is composed of a 35kV power distribution device, a 35kV Circuit Breaker (CB), a 1050/√ 3 +/-16 multiplied by 0.625%/35 kV transformer, an arrester MOA, a Capacitor Voltage Transformer (CVT), a 1000kV Disconnecting Switch (DS), a 1000kV bus, 1000kV outgoing lines (1 single-loop and 2 double-loops on the same tower) and a controllable arrester. Controllable arrester is installed on 1000kV bus, wherein 1000kV is qualified for the next round of competitions and includes: 1 1000kV single-return outlet and two 1000kV same-tower double-return outlets. By closing the breaker CB on the 35kV side of the transformer, an operation overvoltage of closing and air-break is generated on the 1000kV side of the transformer and applied to a controllable lightning arrester installed on a 1000kV bus. Through the cooperation of circuit breaker CB and the control switch K of controllable arrester, realize the degree of depth suppression to 1000kV side operation overvoltage.
Fig. 4 is a schematic diagram of an extra-high voltage alternating current test base control protection loop according to an embodiment of the invention. As shown in fig. 4, which is a schematic diagram of an extra-high voltage ac test base modified to meet verification requirements of control timing and control logic according to an embodiment of the present invention, after the outlet of the measurement and control RCS-9703C remote-control closing circuit breaker on the low-voltage side of the measurement and control cabinet of the 1000kV main transformer, a delay relay is connected in series. Wherein, time delay relay's model is DSP2-4A, and two normal open nodes are rewelded out, include: a first normally open node 1J-1 and a second normally open node 2J-1. And the first normally open node 1J-1 is connected with a hard pressing plate in series (an original standby pressing plate 2LP11 of the screen cabinet is used), and then is exported to a control switch K of the controllable lightning arrester to finish starting the controllable lightning arrester. And the second normally-open node 2J-1 is connected with a delay relay (DZS-229) in series, delays to a preset delay time threshold value of 110ms, and then passes through the hard pressure plate 2LP4 to be exported to a circuit breaker CB on the low-voltage side of the transformer, so that a closing loop of the circuit breaker on the low-voltage side is started.
Fig. 5 is a flow chart of a method 500 for verifying the control logic and control timing of a controllable arrester according to an embodiment of the invention. As shown in fig. 5, a method 500 for verifying a control logic and a control timing sequence of a controllable lightning arrester according to an embodiment of the present invention starts with step 501, and performs a remote signaling signal test in step 501, sends a closing and opening position signal of a control switch of the controllable lightning arrester to a station control terminal, determines whether the station control terminal can accurately display, and determines a first determination result.
Preferably, in step 502, a remote control signal test is performed, a closing command is sent to the control switch and the circuit breaker of the controllable lightning arrester, whether the control switch can be normally closed is determined, whether the circuit breaker can be normally closed after a preset delay threshold is reached is determined, and a second determination result is determined.
Preferably, the control sequence is tested in step 503, and time information of the control switch and the circuit breaker is respectively calculated by collecting closing and opening position signals of the control switch of the circuit breaker and the controllable lightning arrester, wherein the time information includes: the control switch comprises a control switch closing time, a control switch opening time, a circuit breaker closing time and a circuit breaker closing delay time.
Preferably, the accuracy of the control logic and the control sequence of the control switch and the circuit breaker is judged according to the first judgment result, the second judgment result and the time information in step 504.
Preferably, the determining the accuracy of the control logic and the control sequence of the control switch and the circuit breaker according to the first determination result, the second determination result and the time information includes: and if the first judgment result is that the display is correct, the second judgment result is that the closing is normal, and the error between the time information and the preset time threshold is smaller than the preset error threshold, determining that the control logic and the control time sequence between the control switch and the circuit breaker are accurate.
In the embodiment of the invention, a verification test is carried out by utilizing an extra-high voltage alternating current test base in Wuhan. The test results and test errors of the control timing are shown in table 1,
(1) for the closing time of the control switch K of the controllable lightning arrester: the preset time threshold is 100ms, the actual measurement value is 111ms, and the error is 11%.
(2) For the opening time of the control switch K of the controllable lightning arrester: the preset time threshold is 60ms, the actual measurement value is 51ms, and the error is 15%.
(3) Delay time for time relay: the preset time threshold is 110ms and is set based on an estimated value that the closing time of the control switch K is 100ms, so that the control switch K is completely closed within the delay time. However, the actual measurement value of the delay relay is only 90ms, which is smaller than the actual measurement value 111ms of the closing time of the control switch K, and thus cannot satisfy the requirement. In order to ensure that the control switch K can be reliably switched on within the delay time of the time relay, the set time of the time relay needs to be prolonged to be more than 120ms, and the delay time is supposed to be prolonged from 110ms to 150ms in consideration of the fact that both the switching-on time of the control switch K and the delay relay have errors.
(4) For the closing time of a 35kV circuit breaker: the preset time threshold is 85ms, the actual measurement value is 121ms, and the error is 42%, which is relatively large. The main reason is that the closing time of the circuit breakers produced by different manufacturers has dispersibility.
TABLE 1 test results and test errors for control sequences
| Time | Preset time threshold/ms | Test value/ms | Error of the measurement |
| K closing time Tkc | 100 | 111 | 11％ |
| K switching off time Tko | 60 | 51 | 15％ |
| Time relay action time Tt | 110 | 90 | 18％ |
| CB closing time TCBc | 85 | 121 | 42％ |
The method 500 for verifying the control logic and the control timing of the controllable arrester of the embodiment of the present invention corresponds to the apparatus 200 for verifying the control logic and the control timing of the controllable arrester of another embodiment of the present invention, and will not be described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (8)
1. An apparatus for verifying control logic and control timing of a controllable arrester, the apparatus comprising: a main line loop and a control loop,
the main line loop includes: the main line loop is switched on through the breaker at the low voltage side of the transformer, switching-on and switching-off operation overvoltage is generated at the high voltage side of the transformer and is applied to the controllable lightning arrester, and deep suppression of the operation overvoltage at the high voltage side of the transformer is realized through the matching of the breaker and a control switch of the controllable lightning arrester;
the control loop completes the delayed start of the breaker closing loop at the low-voltage side of the transformer by connecting a delay relay in series after the breaker closing outlet of the station control loop; a remote control outlet of a control switch of a controllable lightning arrester is added in the station control loop to control the switching-on and switching-off of the control switch.
2. The apparatus of claim 1, wherein a breaker closing outlet of the station control loop comprises: a first normally open node and a second normally open node;
the first normally open node is connected with a hard pressing plate in series and then is connected to a switch of the controllable lightning arrester at an outlet, and the control switch is started;
and the second normally open node is connected with a time delay relay in series, and after the time delay is up to a preset time delay threshold value, the second normally open node passes through the hard pressing plate outlet to the breaker on the low-voltage side of the transformer, and then a breaker closing loop on the low-voltage side of the transformer is started.
3. The apparatus of claim 1, further comprising: and the capacitor voltage transformer is connected with the high-voltage side of the transformer and is used for measuring the voltage of the high-voltage side of the transformer.
4. The apparatus of claim 1, further comprising:
and the disconnecting switch is used for disconnecting the bus and the high-voltage side of the transformer and is isolated from the distribution device at the low-voltage side of the transformer, and the distribution device is connected with the low-voltage side of the transformer through a circuit breaker.
5. The apparatus of claim 1, wherein the high voltage side of the transformer is 1000kV and the low voltage side of the transformer is 35 kV.
6. The apparatus of claim 1, wherein the bus bar is provided with an outlet line, the outlet line comprising: 1 single-return outlet and two same-tower double-return outlets.
7. A method for verifying the control logic and control timing of a controllable arrester, based on the device for verifying the control logic and control timing of a controllable arrester according to claim 1, characterized in that the method comprises:
carrying out remote signaling signal test, sending switching-on and switching-off position signals of a control switch of the controllable lightning arrester to a station control end, judging whether the station control end can accurately display, and determining a first judgment result;
carrying out remote control signal test, sending a closing command to a control switch of the controllable lightning arrester and the breaker, judging whether the control switch can be normally closed, judging whether the breaker can be normally closed after a preset delay threshold value is reached, and determining a second judgment result;
testing the control time sequence, and respectively calculating the time information of the control switch and the breaker by acquiring the closing and opening position signals of the control switch of the breaker and the controllable arrester, wherein the time information comprises: the switching-on time of the control switch, the switching-off time of the control switch, the switching-on time of the circuit breaker and the switching-on delay time of the circuit breaker are controlled;
and judging the accuracy of the control logic and the control time sequence of the control switch and the circuit breaker according to the first judgment result, the second judgment result and the time information.
8. The method of claim 7, wherein the determining the accuracy of the control logic and the control timing of the control switch and the circuit breaker according to the first determination result, the second determination result and the time information comprises:
and if the first judgment result is that the display is correct, the second judgment result is that the closing is normal, and the error between the time information and the preset time threshold is smaller than the preset error threshold, determining that the control logic and the control time sequence between the control switch and the circuit breaker are accurate.
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| KR20070119222A (en) * | 2006-06-14 | 2007-12-20 | 대웅전기공업(주) | Circuit breaker test device |
| KR101332413B1 (en) * | 2011-12-07 | 2013-11-22 | 곽영규 | Power Line Communication System utilizing Arrester for Electric train system |
| CN104614602B (en) * | 2015-01-07 | 2017-08-04 | 国家电网公司 | A kind of arrester on-Line Monitor Device |
| CN105445583A (en) * | 2015-11-27 | 2016-03-30 | 国家电网公司 | Transformer station lightning arrester test method |
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| CN106771904B (en) * | 2016-11-30 | 2021-06-11 | 中国电力科学研究院 | System and method for performing impact test on controllable lightning arrester in extra-high voltage environment based on time sequence |
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| CN107611937B (en) * | 2017-09-21 | 2020-03-20 | 南京南瑞继保电气有限公司 | Overvoltage protection circuit and method of direct current breaker |
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