Operating Analysis of High Voltage Circuit Breaker in 1999 -2003

The condition of installation and operation of 110 (66) kV and the above high voltage circuit breaker in the natbn - wide power system in 1999 -2003 was given in the paper. According to the type, voltage grade and fault responsibility, the condition of fault and obstacle in operation was analyzed, and the reasons for mal- operation and different type faults caused by insulation, current and outside force were analyzed. The paper summarized the major problems reflected by high voltage circuit breaker fault such as the production quality, transform and update, overhaul management and quality, market access for imported products or the products of joint ventures, the requirements of switching time and breaking capacity test of high voltage circuit breaker, insulation property, breaking of the insulation tie - rod, generator protection of generator - transformer unit in non - all - phase operation. The technical countermeasures were also put forward.