CN107179465B - Extra-high voltage direct current phase selection closing device performance and secondary circuit field test method - Google Patents
Extra-high voltage direct current phase selection closing device performance and secondary circuit field test method Download PDFInfo
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Abstract
The invention discloses a method for testing the performance of an extra-high voltage direct current phase selection switching-on device and a secondary circuit on site, which is characterized in that on the basis of correctly setting the parameters of the phase selection switching-on device, output voltage and current signals of a relay protection tester are connected in series with corresponding phase switches and corresponding voltage and current circuits of a three-phase circuit breaker of a switch field, then an in-station SCADA system is used for issuing a manual switching-on instruction, when the three-phase switches all display the on-position, in-station fault recording data of a test switch are taken, and whether the control effect of the phase selection switching-on device meets the requirements or not is judged according to the time difference between the starting point of each phase current and the voltage zero crossing point of the corresponding phase switch, so that the problem of effectively testing the performance of the phase. The invention has the advantages of no need of increasing hardware cost, simple test wiring, convenient operation and effective verification of the performance of the phase selection closing device and the correctness of the corresponding secondary circuit.
Description
Technical Field
The invention relates to an extra-high voltage direct current transmission technology, in particular to an extra-high voltage direct current phase selection closing device performance and a secondary circuit field test method.
Background
The alternating current filter is used as an important component of a direct current system in the extra-high voltage direct current converter station, and is mainly used for filtering harmonic waves generated by the converter in the rectifying and inverting processes and providing reactive compensation for the direct current system, and the size of the transmission power and the electric energy quality of the direct current transmission system are directly influenced. Typically, the capacity of a single set of ac filters within a converter station is large and switching operations are relatively frequent. When the filter is improperly selected at the switching time, larger transient inrush current impact and overvoltage are generated. On one hand, primary equipment such as an alternating current filter, a capacitor and the like can be damaged; on the other hand, the commutation bus voltage is distorted, and commutation failure is induced. According to the statistical analysis of direct-current commutation failure of the power grid in Huadong in the past year, commutation failure caused by switching of an alternating-current filter accounts for about 5 percent, becomes the second big cause after the fault of an alternating-current system, and seriously threatens the safe and stable operation of the power grid.
In order to reduce the damage, more and more alternating current filter bank circuit breakers in the converter station are provided with phase selection and closing devices, and the impact of a transient process generated at the moment of closing on equipment and a system is eliminated or alleviated by controlling the closing time of the circuit breakers. The relevant secondary circuit of phase selection closing device mainly includes: the current and voltage acquisition loop, the switch-on control instruction loop from the measurement and control device to the phase selection switch-on device, the secondary dry contact related loop in the switch-on control loop and the like are connected in series with the output of the phase selection switch-on device. The secondary loop of the phase selection switch-on device and other secondary equipment form an organic whole, and whether the secondary loop is correct or not directly determines whether the phase selection switch-on device can correctly act or not and the outlet. The basic working principle of the phase selection switching-on device is as follows: a switching-on control instruction of the measurement and control device is firstly input to the phase selection switching-on device. After the phase selection closing device receives a closing instruction, the phase selection closing device combines voltage and current information sampled by the device, and selects proper time to respectively send down a split-phase closing command to each phase closing coil of the circuit breaker through processing such as internal logic operation, so as to control each phase of the circuit breaker to be closed in an ideal phase.
The debugging and checking of the phase selection switching-on device and the related secondary circuit become an important work before the production of the extra-high voltage direct current project. However, the existing phase selection and closing device of the extra-high voltage direct current converter station still lacks enough effective field test means and methods, and brings great hidden danger to project operation. In the debugging stage of the direct current system, alternating current voltage disturbance and phase change failure caused by improper parameter setting of the phase selection switching-on device occur. In response to this problem, researchers have conducted studies on the problem. The relevant patent and scientific literature searched is as follows: the method comprises the following steps of (1) displaying direction, judging power, Liuming faithfulness, and (2) a field debugging technology of a phase selection and closing control device of an extra-high voltage direct current converter station, a power grid technology, 2012 and 36: 17-22, chinese patent document No. 201410376387.0 entitled "system and method for testing phase selection and closing precision of phase selection controller of circuit breaker", and chinese patent document No. CN201410576513.7 entitled "system and method for testing phase selection and closing device in intelligent substation". However, the above documents and patents mainly develop tests on the performance of the phase selection closing device by developing a special testing device for phase selection closing and providing a corresponding testing method, and effectively verify the performance of the device. But the special testing device increases the testing cost on one hand; on the other hand, the research mainly aims at the performance test of the phase selection closing device and lacks effective verification of a secondary circuit related to the phase selection closing device.
In summary, in the practical application of engineering, a new and effective method for testing the performance of the extra-high voltage direct current phase selection switching-on device and the secondary circuit on site is urgently needed, and the performance of the phase selection switching-on device and the correctness of the corresponding secondary circuit are effectively verified while the hardware cost is not increased.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, the method for testing the performance of the extra-high voltage direct current phase selection switching-on device and the secondary circuit of the extra-high voltage direct current converter station on site is provided, the performance of the phase selection switching-on device and the secondary circuit of the phase selection switching-on device can be effectively verified on the basis of not increasing hardware cost, the testing wiring is simple, the operation is convenient, whether the performance of the phase selection switching-on device meets the requirements or not can be effectively verified, and whether the secondary circuit of the phase selection switching-on device is correct.
In order to solve the technical problems, the invention adopts the technical scheme that:
a secondary loop field test method of an extra-high voltage direct current converter station phase selection closing device comprises the following implementation steps:
1) setting equipment parameters of the tested phase selection switching-on device, wherein the equipment parameters comprise the switching-on time T of the circuit breakerBPhase shift parameter TD1Medium time TD2Pre-breakdown time TD3；
2) Testing wiring is carried out on the tested phase selection switching-on device, each phase voltage output signal and current output signal of the relay protection tester are output to the tested phase selection switching-on device through a TA local terminal box, a TV local terminal box and secondary equipment by using a test wire, and a corresponding connecting terminal of the tested phase selection switching-on device is connected with fault recording device equipment in a station;
3) setting correct voltage, current amplitude and phase on a relay protection tester according to the requirements of the phase selection switching-on device, starting the relay protection tester, and outputting corresponding positive sequence voltage and current signals to the phase selection switching-on device and fault recording equipment in a station;
4) determining that the three phases of the alternating current filter switch of the tested group are all at the opening position;
5) sending a manual closing instruction to the tested phase selection closing device;
6) when three phases of the alternating current filter switch of the tested group all display the switching-on position, calling fault recording data of the tested phase selection switching-on device through the fault recording equipment in the station;
7) judging whether each phase voltage and current signal of the tested phase selection switching-on device is acquired according to fault recording data, and if any one path of voltage or current signal is lost or the phase sequence is wrong, judging that a secondary circuit of the tested phase selection switching-on device corresponding to the path of voltage or current signal is incorrect;
8) and based on fault recording data, calculating the time difference between the starting point of each phase current signal and the zero crossing point of the corresponding phase voltage signal as the time difference of the closing time, judging whether the time difference of the closing time meets the performance requirement, and if the time difference of the closing time meets the performance requirement, judging that the closing control performance of the corresponding phase of the tested phase-selection closing device meets the requirement.
Preferably, the detailed steps of step 2) include:
2.1) the secondary connecting piece of the TV and TA body loops is disconnected at the TA local terminal box and the TV local terminal box, and the secondary side of the current body loop is grounded in a short circuit manner, so that reverse charging of the TV and shunting of the TA secondary loop are prevented;
2.2) outputting a signal U by each phase voltage of the relay protection tester by using a test wirea、Ub、Uc、UnRespectively accessing to corresponding voltage loop terminals in a TV local terminal box;
2.3) respectively outputting the current output signals I of each phase of the relay protection tester by using the test wirea、Ib、Ic、InThe upper pile head of the primary switch pile head corresponding to the three-phase circuit breaker is connected, and the lower pile head of the primary switch pile head is connected with the current loop terminal corresponding to the TA on-site terminal box, so that the primary switch equipment is connected with the current loop in series;
and 2.4) utilizing the existing prefabricated cable in the station to keep the TA local terminal box and the TV local terminal box connected with the corresponding connecting terminal of the tested phase selection switching-on device through secondary equipment connected in series/parallel, wherein the corresponding connecting terminal of the tested phase selection switching-on device is connected with fault recording device equipment in the station.
Preferably, the step 8) of determining whether the time difference of the closing time meets the performance requirement specifically means determining whether the time difference of the closing time is within an interval [ -1ms + T ])D2+TD3，1ms+TD2+TD3]In which T isD2For the medium time, T, of the phase-selection switching-on device under testD3And the pre-breakdown time of the tested phase selection switching-on device is obtained.
The method for testing the performance of the extra-high voltage direct-current phase selection closing device and the secondary circuit on site has the following advantages:
1. the performance test of the phase selection closing device can be carried out without increasing hardware cost, namely, without researching and developing a special phase selection closing test device, and the test cost is effectively reduced.
2. The test wiring is simple, the operation is convenient, and the secondary wiring of the relevant relay protection tester and the voltage and current loop can be completed on the switch field.
3. The test method is similar to a protection whole set of test, and can effectively verify whether the performance of the phase selection switching-on device meets the requirements or not and also verify whether the secondary loop of the phase selection switching-on device is correct or not by connecting the output voltage and current of the relay protection tester with the primary switch, the phase selection switching-on device and the in-station fault recording device in series.
Drawings
Fig. 1 is a typical wiring schematic diagram of a phase selection closing device.
Fig. 2 is a phase a data of the fault recording data.
Fig. 3 is B-phase data of the fault recording data.
Fig. 4 is C-phase data of the fault recording data.
Detailed Description
The following takes an example that the model of the circuit breaker is HPL550B2 and the model of the phase selection switching-on device corresponding to the circuit breaker is SWITCHSYNCF236, and further similar descriptions are given to the performance of the extra-high voltage direct current phase selection switching-on device and the field test method of the secondary circuit in the embodiment of the invention.
The method for testing the performance of the extra-high voltage direct-current phase selection closing device and the secondary circuit on site comprises the following implementation steps:
1) setting equipment parameters of the tested phase selection switching-on device, wherein the equipment parameters comprise the switching-on time T of the circuit breakerBPhase shift parameter TD1Medium time (other delays of contact) TD2Pre-breakdown time TD3(ii) a Wherein, the closing time T of the breakerBCan be obtained by actually measuring parameters on site; time of medium TD2Pre-breakdown time TD3The model of the breaker can be obtained by looking up related breaker technical documents; pre-breakdown time TD3The parameter setting of (2) is related to the selection of the reference voltage of the phase selection closing device. Assuming that the reference voltage is taken from phase A, each corresponding TD1Time is respectively TD1-A＝0.0ms、TD1-C＝3.3ms、TD1-B6.7 ms; if the reference voltage is taken from the AB phase-to-phase voltage, then each corresponding TD1Time is respectively TD1-A＝1.7ms、TD1-C＝5.0ms、TD1-B＝8.3ms。
In this embodiment, the reference voltage is AB phase-to-phase voltage. The parameters of the phase selection closing device are set as shown in table 1 according to the field measured parameters and the technical documents of the related circuit breakers.
Table 1: and (5) setting parameters of the phase selection closing device.
2) Testing wiring is carried out on the tested phase selection switching-on device, each phase voltage output signal and current output signal of the relay protection tester are output to the tested phase selection switching-on device through a TA local terminal box, a TV local terminal box and secondary equipment by using a test wire, and a corresponding connecting terminal of the tested phase selection switching-on device is connected with fault recording device equipment in a station;
in this embodiment, the detailed steps of step 2) include:
2.1) the secondary connecting piece of the TV and TA body loops is disconnected at the TA local terminal box and the TV local terminal box, and the secondary side of the current body loop is grounded in a short circuit manner, so that reverse charging of the TV and shunting of the TA secondary loop are prevented;
2.2) outputting a signal U by each phase voltage of the relay protection tester by using a test wirea、Ub、Uc、UnRespectively accessing to corresponding voltage loop terminals in a TV local terminal box;
2.3) respectively outputting the current output signals I of each phase of the relay protection tester by using the test wirea、Ib、Ic、InThe upper pile head of the primary switch pile head corresponding to the three-phase circuit breaker is connected, and the lower pile head of the primary switch pile head is connected with the current loop terminal corresponding to the TA on-site terminal box, so that the primary switch equipment is connected with the current loop in series;
and 2.4) utilizing the existing prefabricated cable in the station to keep the TA local terminal box and the TV local terminal box connected with the corresponding connecting terminal of the tested phase selection switching-on device through secondary equipment connected in series/parallel, wherein the corresponding connecting terminal of the tested phase selection switching-on device is connected with fault recording device equipment in the station. Finally, the connection structure after the tested phase selection closing device is subjected to test wiring is shown in fig. 1.
In this embodiment, the relay protection tester specifically adopts an ONLLY4630G relay protection tester. Respectively outputting three-phase current output signals I of relay protection tester ONLLY4630G by using test wiresa、Ib、Ic、InCorresponding to three-phase breaker HPL550B2The pile heads are connected on the switch for the first time; connecting the primary lower pile head of the switch with a corresponding current loop terminal of the TA local terminal box to realize the serial connection of primary switch equipment and a current loop;
3) setting correct voltage, current amplitude and phase on a relay protection tester according to the requirements of the phase selection switching-on device, starting the relay protection tester, and outputting corresponding positive sequence voltage and current signals to the phase selection switching-on device and fault recording equipment in a station;
4) determining that the three phases of the alternating current filter switch of the tested group are all at the opening position;
5) sending a manual closing instruction to the tested phase selection closing device; in the embodiment, a manual closing instruction is sent to a tested phase selection closing device by an in-station SCADA system (background);
6) when three phases of the alternating current filter switch of the tested group all display the switching-on position, calling fault recording data of the tested phase selection switching-on device through the fault recording equipment in the station;
7) judging whether each phase voltage and current signal of the tested phase selection switching-on device is acquired according to fault recording data, and if any one path of voltage or current signal is lost or the phase sequence is wrong, judging that a secondary circuit of the tested phase selection switching-on device corresponding to the path of voltage or current signal is incorrect;
8) and based on fault recording data, calculating the time difference between the starting point of each phase current signal and the zero crossing point of the corresponding phase voltage signal as the time difference of the closing time, judging whether the time difference of the closing time meets the performance requirement, and if the time difference of the closing time meets the performance requirement, judging that the closing control performance of the corresponding phase of the tested phase-selection closing device meets the requirement.
In this embodiment, the step 8) of determining whether the time difference of the closing time meets the performance requirement specifically means determining whether the time difference of the closing time is within an interval [ -1ms + T ])D2+TD3，1ms+TD2+TD3]In which T isD2For the medium time, T, of the phase-selection switching-on device under testD3And the pre-breakdown time of the tested phase selection switching-on device is obtained. Taking out the test when the three-phase switches all show the closed positionFault recording data in the station of the switch; and judging whether the control effect of the phase selection closing device meets the requirement or not according to the time difference between the starting point of each phase current and the zero crossing point of the corresponding phase switching voltage. According to the proposal of international large power grid Conference (CIGRE), considering the discrete action of the circuit breaker mechanism, when the phase selection control error of the circuit breaker is not more than 1ms, a relatively ideal effect can be obtained. Considering that the applied voltage and the current amount in the scheme provided by the embodiment are both secondary small signals, and the actual primary high voltage is not applied to the switch, the dynamic characteristic and the pre-breakdown characteristic of the medium in the actual switch closing process cannot be simulated. In the method, the current occurrence time is basically consistent with the contact time of the switch contact (a loop is formed after the contact is contacted). Therefore, when this method is used, it is considered that the ideal closing timing of each phase lags behind the normal (rated voltage) closing timing by TD2+TD3The time of day. Therefore, the time difference from the ideal closing time is [ -1ms + T ]D2+TD3，1ms+TD2+TD3]And judging that the control performance of the phase selection closing device meets the requirement.
In this embodiment, fig. 2 to 4 show the in-station fault recording data of the test switch. Referring to fig. 2 to 4, the time difference between the time of the starting point of the a-phase current signal and the time of the zero-crossing point of the a-phase voltage signal is calculated to obtain a time difference of the closing time of the a-phase of 1.7ms, the time difference between the time of the starting point of the B-phase current signal and the time of the zero-crossing point of the B-phase voltage signal is calculated to obtain a time difference of the closing time of the B-phase of 1.4ms, the time difference between the time of the starting point of the C-phase current signal and the time of the zero-crossing point of the C-phase voltage signal is calculated to obtain a time difference of the closing time of the C-phase of 1.3ms, and finally the time difference of the closing time of each.
Table 2, testing the closing time deviation.
| Phase of circuit breaker | Phase A/ms | Phase B/ms | C phase/ms |
| Time difference of closing time | 1.7 | 1.4 | 1.3 |
In this example TD2+TD31.2ms, so the interval [ -1ms + T [ ]D2+TD3，1ms+TD2+TD3]Actual values of [0.2ms, 2.2ms ]]The time difference of ideal closing time of any phase is [0.2ms, 2.2ms]And judging that the control performance of the phase selection closing device meets the requirement. As can be seen from table 2, the switching-on control performance of each phase of the tested phase-selection switching-on device meets the requirements.
In summary, according to the method for testing the secondary circuit of the phase selection switching-on device of the ultra-high voltage dc converter station in the embodiment, on the basis of correctly setting the parameters of the phase selection switching-on device, the output voltage and the current signal of the relay protection tester are connected in series with the corresponding phase switch of the three-phase circuit breaker of the switching field and the corresponding voltage and current circuit, then the in-station SCADA system (background) is used for issuing a manual switching-on command, when the three-phase switches all display the on-position, the in-station fault recording data of the test switch is retrieved, and whether the control effect of the phase selection switching-on device meets the requirements or not is determined according to the time difference between the starting point of each phase current and the voltage zero crossing point of the corresponding phase switch, so that the problem of effectively testing. The method for testing the secondary circuit of the phase selection switching-on device of the extra-high voltage direct current converter station on site has the advantages of no need of increasing hardware cost, simple test wiring, convenience in operation and capability of effectively verifying the performance of the phase selection switching-on device and the correctness of the corresponding secondary circuit.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (1)
1. A method for testing the performance of an extra-high voltage direct current phase selection closing device and a secondary circuit on site is characterized by comprising the following implementation steps:
1) setting equipment parameters of the tested phase selection switching-on device, wherein the equipment parameters comprise the switching-on and switching-off time of a circuit breakerT BPhase shift parameterT D1Time of mediumT D2Pre-breakdown timeT D3；
2) Testing wiring is carried out on the tested phase selection switching-on device, each phase voltage output signal and current output signal of the relay protection tester are output to the tested phase selection switching-on device through a TA local terminal box, a TV local terminal box and secondary equipment by using a test wire, and a corresponding connecting terminal of the tested phase selection switching-on device is connected with fault recording device equipment in a station;
3) setting correct voltage, current amplitude and phase on a relay protection tester according to the requirements of the phase selection switching-on device, starting the relay protection tester, and outputting corresponding positive sequence voltage and current signals to the phase selection switching-on device and fault recording equipment in a station;
4) determining that the three phases of the alternating current filter switch of the tested group are all at the opening position;
5) sending a manual closing instruction to the tested phase selection closing device;
6) when three phases of the alternating current filter switch of the tested group all display the switching-on position, calling fault recording data of the tested phase selection switching-on device through the fault recording equipment in the station;
7) judging whether each phase voltage and current signal of the tested phase selection switching-on device is acquired according to fault recording data, and if any one path of voltage or current signal is lost or the phase sequence is wrong, judging that a secondary circuit of the tested phase selection switching-on device corresponding to the path of voltage or current signal is incorrect;
8) based on fault recording data, calculating a time difference between an initial point of each phase current signal and a zero crossing point of a corresponding phase voltage signal to serve as a time difference of a closing time, judging whether the time difference of the closing time meets performance requirements, and if the time difference of the closing time meets the performance requirements, judging that the closing control performance of the corresponding phase of the tested phase-selection closing device meets the requirements;
wherein, the detailed steps of the step 2) comprise:
2.1) the secondary connecting piece of the TV and TA body loops is disconnected at the TA local terminal box and the TV local terminal box, and the secondary side of the current body loop is grounded in a short circuit manner, so that reverse charging of the TV and shunting of the TA secondary loop are prevented;
2.2) outputting signals of each phase voltage of relay protection tester by using test linesU a、U b、U c、U nRespectively accessing to corresponding voltage loop terminals in a TV local terminal box;
2.3) respectively outputting signals of each phase current of the relay protection tester by using test linesI a、I b、I c、I nThe upper pile head of the primary switch pile head corresponding to the three-phase circuit breaker is connected, and the lower pile head of the primary switch pile head is connected with the current loop terminal corresponding to the TA on-site terminal box, so that the primary switch equipment is connected with the current loop in series;
2.4) utilizing the existing prefabricated cable in the station to keep the TA local terminal box and the TV local terminal box connected with the corresponding connecting terminal of the tested phase selection switching-on device through the secondary equipment connected in series/parallel, and connecting the corresponding connecting terminal of the tested phase selection switching-on device with the fault wave recording device in the station;
wherein, the step 8) of judging whether the time difference of the closing time meets the performance requirement specifically means that whether the time difference of the closing time is within the interval [ -1ms + [)T D2+T D3，1ms+T D2+T D3]Therein, whereinT D2The medium time of the tested phase selection switching-on device,T D3And the pre-breakdown time of the tested phase selection switching-on device is obtained.
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| CN109921425B (en) * | 2019-03-29 | 2023-03-14 | 云南电网有限责任公司电力科学研究院 | AC filter phase selection and closing control method and system based on converter station |
| CN111208418B (en) * | 2020-01-10 | 2022-05-13 | 中国南方电网有限责任公司超高压输电公司广州局 | Phase selection switching-on and switching-off state monitoring system and method for converter station alternating current filter |
| CN113534684B (en) * | 2020-04-22 | 2022-08-26 | 南京南瑞继保电气有限公司 | Phase selection and closing control method and device |
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| CN114047435B (en) * | 2021-10-27 | 2024-04-02 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method and device for testing switching-on time discreteness of circuit breaker |
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| CN114552644B (en) * | 2022-03-02 | 2024-04-26 | 中国南方电网有限责任公司超高压输电公司柳州局 | Method for judging phase-selecting and switching-on effects of alternating current filter of converter station based on wave-recording data |
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| CN104360680A (en) * | 2014-10-24 | 2015-02-18 | 许继电气股份有限公司 | System and method for testing phase-selecting switching-on controller in intelligent transformer substation |
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| CN106405293A (en) * | 2016-10-10 | 2017-02-15 | 许继集团有限公司 | System and method for testing secondary circuit on site in intelligent substation |
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