A New Synthetic Test Circuit for High Voltage Circuit Breakers Based on Dual Current Sources and Its Analysis

With the breaking short-circuit current of circuit breakers continues to increase, and the requirements for the capacity of test laboratory and corresponding testing equipment are also increased simultaneously. The existing conventional test equipment is difficult to meet the test requirements. This paper proposes a new combined synthetic test circuit of dual current source branches + CTF three-circuit voltage source, and we completed a test which test duty is 550 kV 71kA τ = 120 ms T100a for a single pole breaker, we analyzed the equivalence and problems in the process of the circuit, then we proposed the solutions. On the basis of the existing mature test equipment, it can complete the breaking test of the higher short-circuit current circuit breaker, reduce the test risk, and provide a test basis for the development of new products.