电流互感器二次侧短路故障分析及对策

Analysis of CT secondary circuit short-circuit fault and its countermeasure

研究了电流互感器二次侧发生短路故障,尤其是相间短路时,保护装置测量电流的变化情况。通过公式推导和向量分析,简要分析了其对某些保护功能尤其是距离保护和差动保护的影响,并提出了电流互感器二次侧短路的判据对策。

The current variations measured by protective relay during the CT short-circuit fault atsecondary side,eapecially inter-phase S/C,are studied. Using formula derivation and vector analysis,its influence on some functions of protective relays,especially distance relay and differential relay,is introduced and its countermeasure is presented.