四极断路器的选用

Selection of Four Pole Breaker

四极断路器的合理选用关乎电力系统的安全。一方面,四极断路器作为带电导体,若其中性线在某些情况下没有断开,可能引发电击事故;另一方面,若在不需要采用四极断路器的场合选用了四极断路器,可能造成"断零"及其他的安全问题。通过对中性线作用及其保护要求的闸述以及对各接地系统下电气安全的分析,明确四极断路器的选用原则,以供电气设计工程师参考。

Four-pole circuit breaker rational selection is relating to the security of the power system. On the one hand, as the live parts, neutral conductor without disconnection may cause electrical shock in some cases ; on the other hand, four-pole circuit breaker may cause ＇ neutral down＇ issue, when it was used on wrong occasions. Based on the neutral conductor protection and power safety requirement, the four-pole circuit breaker selection principles are clarified and could be an electrical design engineer reference.