The 115-kv, 1 million kva gas-filled breaker

A 115-KV CIRCUIT BREAKER of moderate interrupting capacity designed to meet some special and definite applications has long been deemed desirable on the transmission system of the Gulf Power Company. Consequently, when the gas-filled (sulfur-hexa-fluoride) Type 1150-SF-1000 power circuit breaker rated for 115-kv, 1 million kva service became available, this utility company agreed to purchase three in order to obtain service experience and to permit staged field tests for comparison with test results obtained in the High Power Laboratory.