COMPOSITE GAS-INSULATED SWITCH

PROBLEM TO BE SOLVED: To structure a composite type gas-insulated switch in which a narrow range of the sound part stops within a short period of time if a fault occurs in an apparatus using the same switch, by forming the main bus with the aerial cable, connecting in direct, with a connecting bus, a line unit of the gas-insulated switch connected to the power transmission line and a transformer unit of the gas-insulated switch connected to the transformer, and connecting the connection bus to the main bus with an aerial cable. SOLUTION: A conductor disconnecting part is respectively provided between the first main bus side disconnector of any one unit of the line unit or transformer unit and a circuit breaker, between the second main bus side disconnector and the T branching point connected to the second main bus, between the second main bus side disconnector of the other unit and the circuit breaker, and between the first main bus side disconnector and the T branching point connected to the first main bus.