Life Management of 550kV SF6 circuit breakers

In order to evaluate the actual condition of high voltage SF
₆
circuit breakers, a reliable measurement of their ageing and failure characteristics with suitable sensors and condition monitoring is necessary. In this paper, reliability models are developed for individual characteristic parameter such as SF
₆
leakage, N
₂
leakage, or oil leakage and control- and protection problem, etc. The physics - statistics based life model is developed and improved on the basis of the data collection which describes the electrical, thermal, and mechanical ageing behaviour of high voltage SF
₆
circuit breakers with individual parameter, depending on the statistical surveys on failure.