Cut-off terminal short trouble experiment loop used for ultra/extra-high voltage breaker

Abstract

The invention relates to an on-off terminal short-circuit fault testing of a 800kV and a 1100kV ultra-high / extremely-high voltage AC circuit breaker, in particular to an on-off terminal short-circuit fault testing loop of an ultra-high / extremely-high voltage circuit breaker. The on-off terminal short-circuit fault testing loop comprises a test main electrical power source and a test circuit breaker. The invention is characterized in that the on-off terminal short-circuit fault testing loop also comprises a first auxiliary circuit breaker, a second auxiliary circuit breaker, a first voltage source and a second voltage source, wherein, the first auxiliary circuit breaker is connected between the high-voltage end of the test main power source and one terminal of the test circuit breaker in series, the second auxiliary circuit breaker is connected between the low-voltage end of the test main power source and the other terminal of the test circuit breaker in series, the first voltage source is connected with the test circuit breaker in parallel, and the second voltage source is connected with the second auxiliary circuit breaker in parallel.

Description

technical field [0001] The invention relates to a short-circuit fault test of breaking terminals of 800kV and 1100kV super / ultra-high voltage AC circuit breakers, in particular to a test circuit for short-circuit faults of breaking terminals of super / ultra-high voltage circuit breakers. Background technique [0002] With the continuous expansion of the power grid, the capacity of the power system continues to increase, the power transmission distance is lengthened, the voltage level is increased, and the system fault current is also increased. This puts more and more stringent requirements on the work of circuit breakers. Can correctly test the performance of the circuit breaker to meet the requirements of the power system. [0003] For the inspection of circuit breaker terminal short-circuit fault opening, the direct test method is usually used, but for the circuit breaker with a large short-circuit breaking capacity, it is difficult for the laboratory to use the direct tes...

AI Technical Summary

Problems solved by technology

[0003] For the inspection of circuit breaker terminal short-circuit fault opening, the direct test method is usually used, but for the circuit breaker with a large short-circuit breaking capacity, it is difficult for the laboratory to use the direct test method to meet the requirements of its breaking capacity. synthetic test method

Internationally, the method of current introduction is usually adopted for synthetic tests, but for ultra-high voltage AC circuit breakers with voltage levels of 800kV and 1100kV, the limitation of the method of current introduction is that the frequency of the introduction of current is lower than the lower limit required by the standard 250Hz

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