Features and application of compressed air circuit breakers

Compressed air air circuit breaker since its inception in the 1940s, the rapid development in the 1950s and 1960s, is widely used in HV and EHV power systems. Its main features are: ① moves fast breaking time is short, the 1970s have used one week wave breaker. This has greatly improved the power system stability. ② high breaking capacity, the proposed power system to meet the higher ratings and electric meter requirements. ③ can be used modular structure, the series resistance. Due to a simple structure, good performance and electric arc long life SF6 Circuit breaker so that the use of compressed air circuit breakers narrow. The Nordic and some alpine areas due to SF6 gas liquefaction and breaking capacity lower (by about 20%) and other reasons, some countries in the high-pressure, high pressure grid is still in use compressed air circuit breakers. In addition, large capacity generator breaker, breaking capacity required prompt action, now widely used compressed air circuit breakers.