发电厂高压电动机断相保护的探讨

On open-phase protection for HV motors in power plants

针对目前高压电动机断相故障率高,而高压电动机保护大多数情况下不能进行断相保护的问题,分析了发电厂高压电动机发生常见的内部断相故障时流过的负序电流的特性,提出了用负序电流保护作电动机断相保护的新观点,并对负序电流保护的整定原则进行了探讨。

At present,HV motors in power plants are of high phase failure rate,but the protection for HV motors is not capable of openphase protection in most cases.Therefor,this paper analyzes the characteristics of negativesequence current during common phase failures in HV motors,presents a new opinion of using negativesequence current protection as openphase protection for motors,and discusses the setting principles of negativesequence current protection.