抄録
Optimal dosing target of 550kV gas circuit breaker (GCB) is investigated. In dosing operation of GCB, making voltage depends on dielectric and mechanical characteristics of GCB, therefore optimal closing target has to be determined by investigation of these characteristics. Optimal closing target and estimated making voltage are shown as functions of Rate of Decrease of Dielectric Strength (RDDS) and mechanical scattering of closing time of GCB. Closing characteristics of 2 break GCB are investigated considering a change of the dividing voltage of each pole. Synchronous closing of 550kV live tank GCB were tested with the optimum targets for minimum and maximum making voltage prospected by the functions. The EMC tests of the synchronous switching controller were also confirmed by switching test with 550kV circuit.
