Oil circuit breaker for 7,500,000-kva service

A NEW DESIGN of high-voltage dead-tank type of oil circuit breaker has been developed for 230-kv service and above which requires a minimum amount of oil with the attendant simplification in methods of oil handling and maintenance procedures, while still retaining the advantages of the time-proved round tank construction. This circuit breaker culminates a period of intensive development over the past ten years during which, in the 230-kv class, the ratio of kilovolt-amperes interrupted per gallon of oil has increased by over 11 times.