The key to perform synthetic making test at full rated voltage for high voltage switches is the making device of current source, which should have the capability to withstand the static and transient voltage and also can conduct short-circuit current without excessive erosion, Moreover it ought to be hair-trigger and control accurately. A new kind of fast making device is emphatically expounded in this research, which is composed of triggered vacuum switch (TVS) and a fast vacuum circuit breaker (FVCB) with permanent magnetic actuator. Parallel-connected TVS and FVCB make up the basic optic-controlled module. And basic modules arranging in series can be increase the hold-off (withstand) voltage. When the closing command is triggered, TVS acts in several microseconds and carries the high making current first. FVCB acts as the parallel protecting device for TVS, its closing command is sent simultaneously with TVS. Once FVCB closed the making current will shift to this branch, the erosion in TVS can be remarkably decreased. The chief aim of this research is to investigate the feature of TVS and FVCB, and to determine experimentally whether the provided fast making switch was suitable for high voltage circuit breakers synthetic making test. In order to research and optimize the triggering performance of TVS and actuator of FVCB, lots of simulation and experiment have been carried out and the results are also provided in this research.
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