谐波对真空开关分断性能的影响

用数值计算方法具体计算了含谐波电流的最大值，发现即使在谐波电流总畸变率满足国际要求的情况下电流最大值不家可能远比基波最大值大。这虽不会影响真空断路器的分断能力及电寿命，但对真空负荷开关影响很大，有可能使真空负荷开关分断失败，使其电寿命大大缩短，因此，用熔断器－真空负荷开关来代替断路器的使用场合，应注意分断谐波负荷电流时引起的分断失败及开关寿命缩短的问题。

Influence upon the Breaking Capacity of Vaccum Circuit Breaker by Harmonic Current

The peak value of the current with harmonic component was computed simulately in this paper. The result shows that the peak value increases quite a lot even the total harmonic distortion of the complex current is in the level stipulated by the national standard. The increased current peak level will not impair the breaking capacity and the electric endurance of the vacuum circuit breaker while it will decrease those of the vacuum load switch, which should be paid more attention when the fuse vacuum circuit breaker combination is used to avoid the failed breaking and the shorten electric endurance.