Protecting method and apparatus for re-striking arc failure in breaking test of high-voltage circuit breaker

Abstract

The invention relates to a protecting method and apparatus for a re-striking arc failure in a breaking test of a high-voltage circuit breaker. The method comprises: S1, when duration time of a first real-time current not lower than a rated current of a high-voltage circuit breaker exceeds anti-jamming time, an S2 is executed; S2, when a second real-time current is lower than a re-striking arc current detection value and duration time exceeds T2 time, an S3 is executed; S3, when a third real-time current is not lower than the rated current of the high-voltage circuit breaker and duration time exceeds anti-jamming time, an S4 is executed; S4, when a fourth real-time current is lower than the re-striking arc current detection value and duration time exceeds T4 time, an S5 is executed; S5, a counter carries out zero clearing and the S1 is executed. Therefore, all functions of the common relay protection device can be realized and re-striking arc failure protection during a breaking test of a high-voltage circuit breaker can be completed, so that real-time full-course tracking and protection of a large-capacity experimental station can be realized and the service life of the own switch or electrical equipment of the large-capacity experimental station can be prolonged substantially.

Description

technical field [0001] The invention relates to the technical field of protection of large-capacity experimental stations, in particular to a protection method for heavy arcing faults in high-voltage circuit breaker breaking tests of large-capacity experimental stations. Background technique [0002] In the power system, the reliable and stable operation of high-voltage electrical appliances is the prerequisite for the normal and efficient operation of the entire power grid system. The type test of high-voltage electrical appliances is an important link to test their performance. With the development of the power system, the voltage level and short-circuit capacity of the system are increasing day by day, and the requirements for the breaking short-circuit current capability of high-voltage circuit breakers in high-voltage electrical appliances are also increasing. The breaking process of high-voltage circuit breakers is very complicated, and the performance of the product c...

AI Technical Summary

Problems solved by technology

[0005] However, during the test process of the actual high-voltage circuit breaker, that is, after the circuit breaker first breaks "O" or the second breaks "O", the entire circuit is disconnected and the state of no current lasts for 300ms ( figure 1 T4) in T4) often occurs heavy breakdown or heavy arcing. Since there is no overcurrent that is significantly larger than the short circuit current of 31.5kA, ordinary relay protection equipment or overcurrent equipment cannot protect this situation at all. , at this time, the approximate energy value required by the large-capacity experimental station in the entire program process under this test product failure state is "110MA 2 s(0.1s)—330MA 2 s(0.3s)—110MA 2 s(0.1s)—330MA 2 s(0.3s)", the energy value provided in this case is 4 times that of non-fault

For this kind of situation, it is a great impact and damage to the switchgear or reactance equipment of the large-capacity experimental station itself. Originally, each time the breaking test of the high-voltage circuit breaker is due to the high voltage and high current, it is very difficult for the large-capacity experimental station. A kind of impact and damage, and when the test product fails, cannot be normally broken or arcing occurs, it is a fatal impact and damage to the equipment and electrical appliances of the large-capacity experimental station, and this impact and damage has cumulative benefits, greatly accelerating the aging and decommissioning of equipment

Due to the high voltage level and high current of the electrical equipment in the large-capacity experimental station, the equipment is generally very expensive, and it is very troublesome to replace or repair

[0006] At present, the large-capacity experimental stations for high-voltage circuit breaker breaking tests are protected by ordinary or conventional relays, and ordinary relays can only perform simple overcurrent and time setting protection. For high-voltage circuit breaker breaking tests In the process of re-ignition arc or re-puncture phenomenon, there is nothing to do, and it is impossible to protect

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