Testing circuit and method for detecting breaking performance of DC circuit breaker

Abstract

The invention discloses a testing circuit and method for detecting the breaking performance of a DC circuit breaker. The testing circuit is used for effectively replacing a testing circuit which is built for achieving testing of the DC circuit breaker and is large in investment in an equivalent replacement mode. According to the testing circuit, the capacitance of a low-frequency oscillation circuit (or a high-frequency oscillation circuit) is output to the high-voltage end of the DC circuit breaker through a high-voltage ignition ball, an auxiliary switch AB1 and a reactor LS, a series branch circuit formed by an auxiliary switch AB2 and a current limiting reactor is connected with a DC circuit breaker branch circuit in parallel, and the DC circuit breaker branch circuit is a DC circuit breaker protection circuit which can prevent the situation that the DC circuit breaker is excessively burnt or damaged due to the fact that the current through the DC circuit breaker is not shut off. A lightning arrester and a sphere gap are protective devices and can prevent overvoltage from damaging testing equipment. A charging device CD1 is used for charging a capacitor bank CS, and a charging device CD2 is used for charging a capacitor C0. Moreover, through reasonable time sequence setting, a trigger device can act at schedule time to complete testing detection of the DC circuit breaker.

Description

【Technical field】 [0001] The invention belongs to the technical field of testing a high-voltage direct current circuit breaker for direct current transmission, and in particular relates to a test circuit and a test method for detecting the breaking performance of a direct current circuit breaker. 【Background technique】 [0002] The DC circuit breaker is one of the important equipment in the converter station of the UHV DC transmission project. Its main function is to clear the short-circuit fault on the DC side, that is, when the DC system fails, the DC circuit breaker is used within a short period of time (within 5ms). The circuit breaker interrupts the DC short-circuit current. In order to prove that the DC circuit breaker has this ability, experiments are used in the laboratory to verify its performance of breaking DC short-circuit current. [0003] The test circuit for the DC circuit breaker breaking performance test is to simulate the actual working conditions of the D...

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Problems solved by technology

[0003] The test circuit for the DC circuit breaker breaking performance test is to simulate the actual working conditions of the DC circuit breaker in the DC system. Since the DC circuit breaker has to withstand high voltage after breaking the current, the voltage of the DC

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