BREAKING TESTING DEVICE FOR HIGH-VOLTAGE DIRECT-CURRENT CIRCUIT BREAKER, AND TESTING METHOD THEREFOR

摘要

A breaking testing device for a high-voltage direct-current circuit breaker, and a testing method therefor. A reactor L of the device and a high-voltage direct-current circuit breaker are serially connected and then respectively connected in parallel to a high-voltage circuit and a low-voltage circuit. Two ends of the high-voltage direct-current circuit breaker are connected in parallel to bypass switches. Two ends of a full-bridge module in a mechanical switch-full-bridge module branch are connected in parallel to protective thyristors. In the testing method, a low-voltage large-current source injects a rated current to a circuit breaker through an isolating thyristor valve; a high-voltage small-current source is used to charge a capacitor, an initial testing voltage is established, a high-voltage circuit is triggered by a spark gap, a testing current is adjusted by the reactor and is then injected into the circuit breaker, the isolating thyristor valve is turned off, the breaking is implemented when an expected breaking current or a maximum breaking time is reached, and the circuit breaker tolerates a transient-state recovery overvoltage and a high-voltage circuit capacitor residual-voltage. By means of the device and the method, a current, a voltage and a heat stress of a high-voltage direct-current circuit breaker in actual operation can be reproduced, and testing equivalence is high, thereby providing a capability of reliably detecting the breaking performance of the circuit breaker.