Condition evaluation and analysis of 110 kV and above SF6 circuit breakers

Breakers involved in this evaluation include AC circuit, DC circuit, and series compensation bypass circuit breakers, which are shown in Table 1.

2.1.1 Statistics of the run time of the circuit breakers

Among 606 circuit breakers, there were 342 units in operation life within five years, 148 ones with 5 years to 10 years, 116 ones with more than 10 years, as shown in Figure 1.