High voltage SF6 circuit breaker modeling for capacitor bank controlled switching simulation

The controlled switching technology gives the best performance for capacitor bank energization. The development of its adaptive algorithm requires circuit breaker modeling in computer simulation. A normal circuit breaker in EMTP simulation program does not concern with the pre-arcing of circuit breaker. The pre-arcing is a phenomenon which causes the circuit breaker to conduct current before touching of its contacts. This pays important role in capacitor bank energizing control. The model is designed with the adjust ability of rate of decrease of dielectric strength (RDDS). Moreover the closing time is also the adjustable parameter. The designed model is verified by RDDS testing process in computer simulation. Then the result is compared with the RDDS testing of the real circuit breaker. The testing indicates that the pre-arcing voltage of the real and simulated circuit breakers give the consistent result.