摘要
重点分析了电网在发生单相接地故障时的电流分布,讨论了在不接地系统中增加接地点的可能性以及增加接地点的方法,并对各种现有的方法进行了分析,最后提出了增加接地变压器的可行方案和对于此系统继电保护整定的要求,以实现低压系统发生单相接地故障时,通过保护装置跳闸切除故障,防止损坏一次设备的事故发生。
This paper focuses on the analysis of current distribution when single-phase-earth fault. The possibility and approaches of changing ungrounded supply system to grounded one are discussed. On the comparison of all the feasible methods, this paper puts forward that installing grounded transformer is suitable for system changing. The proposed method will meet the needs of relay protection coordination that faults can be removed by protection tripping, when single-phase-earth-fault, to avoid the accidents of primary equipment.
出处
《继电器》
CSCD
北大核心
2004年第11期62-64,67,共4页
Relay
关键词
电阻接地
小电流接地系统
消弧线圈
零序电流
零序阻抗
grounded transformer
grounded system via resistance
coordination of zero-sequence protection
