Research on High Frequency Induced Current Based High Voltage Circuit Breaker Opening and Closing Time Testing Method

High voltage circuit breaker in the power system plays an important role in the control and protection, high voltage circuit breaker opening and closing time accurate measurement can not only test the performance status of the circuit breaker, but also affects the safe operation of the power system. In order to meet the needs of on-site safety maintenance of high voltage circuit breakers and the accurate testing of breaking and closing times, this paper proposes a method of testing the breaking and closing times of high voltage circuit breakers based on induced currents under the condition of grounding both ends of high voltage circuit breakers, which indirectly analyses the breaking and closing times obtained by the coupled high frequency induced currents. Firstly, the circuit breaker through-fluid circuit is built, and an induced current of fixed frequency is injected into the circuit, secondly, the time-frequency conversion of the circuit current signal is extracted and analysed by using HHT (Hilbert-Huang Transform), and the breaking and closing time is obtained, and finally, the method is verified in the field of the substation, and the test results show that the method is reliable. The results of the study can provide a reference for the new maintenance technology of high voltage circuit breaker.