CAJ | 학술논문

根据小电阻接地方式下的零序保护原理，介绍了小电流接地系统零序保护不动作的原因，分析了一起线路零序保护由于存在保护死区致使故障范围扩大的案例，通过对如何防止零序保护拒动问题进行探讨，提出了相应的反事故措施及其对策，为防止线路零序保护死区故障，建议其零序电流采用三相电流互感器合并而成，并制定有针对性的保护定值调整方案，为设备安全稳定运行提供保障。
근거소전조접지방식하적령서보호원리，개소료소전류접지계통령서보호불동작적원인，분석료일기선로령서보호유우존재보호사구치사고장범위확대적안례，통과대여하방지령서보호거동문제진행탐토，제출료상응적반사고조시급기대책，위방지선로령서보호사구고장，건의기령서전류채용삼상전류호감기합병이성，병제정유침대성적보호정치조정방안，위설비안전은정운행제공보장。
According to the zero sequence protection principle under the small resistance grounding method, this paper introduced the zero sequence protection action refusal cause of small resistance grounding system and analyzed a case of line zero sequence protection due to existing of protection dead zone leading to fault range expansion. This paper discussed how to prevent the zero sequence protec-tion action refusal problem from taking place and raised the corresponding fault countermeasures. In order to avoid dead zone faults of line zero sequence protection, this paper suggests that the zero sequence current should be merged in three-phase current transformer and the protection setting value adjustment scheme should be set down to provide insurance for safe and stable operation of equipment.