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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。
The rational selection of the four-pole circuit breaker relates to the safety of the power system. On the one hand, four-pole circuit breakers as live conductors, if the neutral line is not disconnected in some cases, may lead to electric shock; the other hand, if the need to use quadrupole circuit breaker occasions choose four-pole circuit breaker , May cause “zero off ” and other security issues. Through the description of the neutral function and its protection requirements and the analysis of the electrical safety under each grounding system, the principle of selection of quadrupole circuit breakers is clarified for reference by the electrical design engineer.