Electrical Features of the High-Voltage Switchyard - Niagara Power Project

The switchyard discussed in this paper is associated with a large hydroelectric generating station. Voltages of the 115-, 230-, and 345-kv classes are involved, and various ratings and pertinent features of major equipment are enumerated. A double-bus breaker-and-a-third scheme is used at 115 and 230 kv, and a ring-type bus system is used for the 345-kv circuitry. The station is located in an area where air-borne contaminants are a major problem, and the steps taken to combat this condition are discussed.