CN103983890A - Search method for fault points generated due to the influence of alternating current crosstalk on relay and test circuit - Google Patents
Search method for fault points generated due to the influence of alternating current crosstalk on relay and test circuit Download PDFInfo
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- CN103983890A CN103983890A CN201410239884.6A CN201410239884A CN103983890A CN 103983890 A CN103983890 A CN 103983890A CN 201410239884 A CN201410239884 A CN 201410239884A CN 103983890 A CN103983890 A CN 103983890A
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Abstract
The invention discloses a search method for fault points generated due to the influence of alternating current crosstalk on a relay and a test circuit for search of the fault points generated due to the influence of alternating current crosstalk on the relay. Through the test circuit, equivalent resistance of the relay to be tested and the time of duration that the voltage of a coil meets motion voltage of the relay are acquired; the potential fault points in a transformer substation are rapidly found according to recorded data, and the found potential fault points are processed and corrected according to a recorded data analysis result. Thus, operation safety of a power system is improved.
Description
Technical field
The present invention relates to technical field of relay protection, particularly relate to a kind of interchange and crosstalk on the trouble spot lookup method of relay impact generation, for searching the test circuit that exchanges the trouble spot that impact produces on relay of crosstalking.
Background technology
DC power system is as the power-supply system of most secondary devices in protective relaying device, safety stabilizing devices and transformer station, and its reliability is most important to guaranteeing power system safety and stability operation.D.C. isolation monitoring device is the visual plant of monitoring DC power system state of insulation.While there is the faults such as DC system grounding, insulation reduction when transformer station, insulation monitoring and warning device sends warning information.But due to the earthing wire-selecting element of insulation monitoring and warning device with break down after for the equipment of searching, lack not equal reason mutually of the defect of unified standard, insulation monitoring and warning device design function, different insulation monitoring and warning device monitoring principle, add that the AC-DC interference time is too short, fault amount generally will disappear in the sense cycle of insulation monitoring and warning device, promptly and accurately alarm of insulation monitoring and warning device while causing the AC in the DC.
When secondary circuit generation AC-DC interference, be not only and crosstalk a little, especially an interference at full station; can cause accident from the weakest place, such as easily causing the relay misoperation work etc. of protective device, trouble spot is hidden; be unfavorable for fast finding and the recovery of fault, have potential safety hazard.
Summary of the invention
Based on this, be necessary for the problems referred to above, provide a kind of interchange to crosstalk on the trouble spot lookup method of relay impact generation, for searching the test circuit that exchanges the trouble spot that impact produces on relay of crosstalking, can go out the potential trouble spot of transformer station and it is revised by fast finding, improve the security of substation operation.
Interchange is crosstalked affects on relay the trouble spot lookup method producing, and comprises step:
Build test circuit, described test circuit comprises: one end in DC power system between anodal and relay to be measured, the tunable capacitor of other end ground connection; One end between DC power system negative pole and described relay to be measured, the ac generator of other end ground connection;
By ac generator, add interference voltage, the coil voltage that records described relay to be measured meets the time of actuating of relay voltage to be measured, the equivalent resistance of described relay to be measured;
Keep the operating power of described relay to be measured constant, adjust described tunable capacitor, record the duration that described coil voltage meets actuating of relay voltage to be measured;
According to potential trouble spot in the data search transformer station of record, analyze the operating power of described relay to be measured and equivalent resistance, the impact of described tunable capacitor on the described duration, according to the result of analyzing, incipient fault point is revised.
For searching a test circuit that exchanges the trouble spot that impact produces on relay of crosstalking, comprising: one end in DC power system between anodal and relay to be measured, the tunable capacitor of other end ground connection; One end between DC power system negative pole and described relay to be measured, the ac generator of other end ground connection.
The present invention's interchange is crosstalked affects the trouble spot lookup method producing, the test circuit of crosstalking on the trouble spot of relay impact generation for searching interchange to relay, while mutually comparing with prior art, has the following advantages:
1, whether longlyer can judge that relay coil voltage meets time of actuating of relay voltage according to the data of test, whether be greater than 5 milliseconds etc. such as the time, thereby easily make relay misoperation, generation fault;
Impact on the described duration while 2, analyzing respectively operating power, equivalent resistance, tunable capacitor change according to the data of test, according to the corresponding data of result adjustment of analyzing, thereby shortened (during lower than certain critical value the duration, duration can be 0 millisecond), relay is not easy misoperation, improves the security of substation operation;
3, can test respectively the relay of different manufacturers, obtain the data of each conventional relay of transformer station, during practical application, according to the corresponding test data of the type selecting of transformer station's relay, judge, improve the accuracy of judgement;
4, according to the data of test, can arrive incipient fault point by fast finding, before fault occurs, in advance fault be carried out to correcting process, reduce fault occurrence probability.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the inventive method embodiment;
Fig. 2 is the schematic diagram of test circuit embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, on exchanging the embodiment of the trouble spot lookup method that impact produces on relay of crosstalking, be described in detail.
As shown in Figure 1, the method for testing that a kind of interchange is crosstalked relay is affected, comprises step:
S110, build test circuit, as shown in Figure 2, described test circuit can comprise: one end between DC power system positive pole+KM and relay to be measured 200, the tunable capacitor 100 of other end ground connection; One end between DC power system negative pole-KM and described relay to be measured 200, the ac generator 300 of other end ground connection;
In Fig. 2+Ukm ,-Ukm be respectively the both positive and negative polarity voltage of DC power system, can get ± 55V of DC power system rated voltage; Uac is coupled interference voltage, and Iac is couple current; Id is the fly-wheel diode electric current of relay 200 to be measured, and Ud is the coil motion voltage of relay 200 to be measured, and span is 0～380V, be test circuit can test action voltage up to the relay of 380V; Tunable capacitor C gets cable earth capacitance, and Uc is capacitance voltage;
Relay to be measured can be chosen the relay of conventional protective device in operating transformer station, the protective device that the companies such as auspicious in south, Nanjing, Beijing is cubic produce etc., according to the data of a certain type relay of test circuit test, be generally applicable to use transformer station's fault judgement of the type relay, so need to test respectively corresponding data for different relays; In the time of can using the oscillograph recording actuating of relay to be measured, the waveform of coil motion voltage U d, coupled interference voltage U ac, couple current Iac etc., is convenient to carry out data statistics and analysis; In test process, the interference voltage of described ac generator 300 remains unchanged, for example Uac=AC220V;
S120, by ac generator, add interference voltage, the coil voltage that records described relay to be measured meets the time of actuating of relay voltage to be measured, the equivalent resistance of described relay to be measured;
Actuating of relay voltage generally equals relay rated voltage and is multiplied by a certain ratio, the rated voltage of relay can be chosen arbitrarily, ratio need to be determined according to relay purposes and concrete industry standard, for example, the operation voltage of tripping relay is generally 55%～70% of tripping relay rated voltage; During for synthetic determination the AC in the DC, relay is easy misoperation, can get many group operation voltages, the coil voltage of comprehensive judgement relay meets the time of actuating of relay voltage, for example, when the operation voltage that records tripping relay is 55%, 60%, 66% tripping relay rated voltage, the coil voltage of tripping relay meets the time of tripping relay operation voltage;
Whether the coil voltage that judges relay meets time of actuating of relay voltage longer, thereby easily makes relay misoperation do, and the general time surpasses 5 milliseconds and can judge that the time is longer, easily makes relay misoperation do;
S130, keep the operating power of described relay to be measured constant, adjust described tunable capacitor, record the duration that described relay coil voltage to be measured meets actuating of relay voltage to be measured;
For the ease of logarithm, it is investigated and see analysis, the data of above-mentioned steps can be inserted to following form 1:
Because the relay characteristic to be measured of different protective devices is not identical, the data of the relay of a type of test are not necessarily applicable to the relay of another kind of type, so need to test according to the step of S120-S130 respectively for the conventional relay of transformer station, obtain the test data of all types of relays;
S140, according to potential trouble spot in the data search transformer station of record, analyze the operating power of described relay to be measured and equivalent resistance, the impact of described tunable capacitor on the described duration, according to the result of analyzing, incipient fault point is revised.
For potential trouble spot is processed, need to analyze the test data of relay to be measured, the result of analysis comprises:
When described tunable capacitor remains unchanged, the operating power of described relay to be measured is larger, equivalent resistance is less, it is shorter that coil voltage meets the duration of actuating of relay voltage to be measured, relay to be measured is more not easy misoperation, security is higher, at relay equivalent resistance to be measured, during lower than certain value, the duration is 0 millisecond;
When the operating power of described relay to be measured remains unchanged, described tunable capacitor is less, and it is shorter that coil voltage meets the duration of actuating of relay voltage to be measured, and relay to be measured is more not easy misoperation, tunable capacitor lower than certain value after, the duration is 0 millisecond.
According to the result of analyzing, can revise the type relay, for example the operating power of relay remains unchanged, and turns tunable capacitor down, and the duration is shortened, and relay is not easy malfunction, guarantees the reliability of system.
Based on same inventive concept, it is a kind of for searching the test circuit that exchanges the trouble spot that impact produces on relay of crosstalking that the present invention also provides, as shown in Figure 2, described test circuit comprises: one end between DC power system positive pole+KM and relay to be measured 200, the tunable capacitor 100 of other end ground connection; One end between DC power system negative pole-KM and described relay to be measured 200, the ac generator 300 of other end ground connection.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (3)
1. interchange is crosstalked affects a lookup method for the trouble spot producing on relay, it is characterized in that, comprises step:
Build test circuit, described test circuit comprises: one end in DC power system between anodal and relay to be measured, the tunable capacitor of other end ground connection; One end between DC power system negative pole and described relay to be measured, the ac generator of other end ground connection;
By ac generator, add interference voltage, the coil voltage that records described relay to be measured meets the time of actuating of relay voltage to be measured, the equivalent resistance of described relay to be measured;
Keep the operating power of described relay to be measured constant, adjust described tunable capacitor, record the duration that described coil voltage meets actuating of relay voltage to be measured;
According to potential trouble spot in the data search transformer station of record, analyze the operating power of described relay to be measured and equivalent resistance, the impact of described tunable capacitor on the described duration, according to the result of analyzing, incipient fault point is revised.
2. interchange according to claim 1 is crosstalked affects the lookup method of the trouble spot producing on relay, it is characterized in that, the result of analysis comprises:
When described tunable capacitor remains unchanged, the operating power of described relay to be measured is larger, equivalent resistance is less, and the described duration is shorter;
When the operating power of described relay to be measured remains unchanged, described tunable capacitor is less, and the described duration is shorter.
3. for searching a test circuit that exchanges the trouble spot that impact produces on relay of crosstalking, it is characterized in that, comprising: one end in DC power system between anodal and relay to be measured, the tunable capacitor of other end ground connection; One end between DC power system negative pole and described relay to be measured, the ac generator of other end ground connection.
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Cited By (4)
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| CN104237583A (en) * | 2014-09-04 | 2014-12-24 | 广州供电局有限公司 | Relay mal-operation preventing method based on influence of voltage fluctuation on relay and circuit |
| CN104251978A (en) * | 2014-09-04 | 2014-12-31 | 广州供电局有限公司 | Tester for affection of alternating-current crosstalk and voltage fluctuation of direct-current system on relay |
| CN110501634A (en) * | 2019-08-01 | 2019-11-26 | 武汉大学 | Based on the intermediate relay device for preventing unwanted operation and method for improving recursive wavelet algorithm |
| CN114167175A (en) * | 2021-11-29 | 2022-03-11 | 广西电网有限责任公司钦州供电局 | Relay alternating current channeling and voltage fluctuation testing method |
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| CN110501634A (en) * | 2019-08-01 | 2019-11-26 | 武汉大学 | Based on the intermediate relay device for preventing unwanted operation and method for improving recursive wavelet algorithm |
| CN110501634B (en) * | 2019-08-01 | 2022-01-28 | 武汉大学 | Intermediate relay misoperation prevention device and method based on improved recursive wavelet algorithm |
| CN114167175A (en) * | 2021-11-29 | 2022-03-11 | 广西电网有限责任公司钦州供电局 | Relay alternating current channeling and voltage fluctuation testing method |
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| CN103983890B (en) | 2017-04-12 |
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Effective date of registration: 20201019 Address after: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Address before: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd. |