基于电流采样值相间差的小电流接地系统接地保护方法  

Single-phase grounding fault protection with sampled current difference between phases for ineffectively earthed distribution systems

作　　者：曾祥君[1] 王媛媛[1] 夏云峰[1] 穆大庆[1] 

机构地区：[1]长沙理工大学电气与信息工程学院,湖南长沙410076

出　　处：《长沙理工大学学报（自然科学版）》2006年第3期78-83,共6页Journal of Changsha University of Science and Technology:Natural Science

基　　金：国家自然科学基金资助项目(50207001;50577001);教育部新世纪优秀人才计划资助项目(NECT-04-0781);霍英东教育基金会青年教师基金资助项目(101058)

摘　　要：小电流接地系统单相接地故障电流小,弧光接地故障保护精度以及可靠性差.通过测量各馈线相电流采样值变化量的相间差值来实现接地保护,当相间差值大于整定值的采样点数超过一定数时,判断为接地故障,并完成馈线接地保护装置的研制.EMTP仿真分析和动模实验表明,该方法具有抗弧光能力强、保护精度与可靠性高等特点.Traditional ground fault protection has poor precision and reliability to detect arc-grounding fault in ineffectively earthed distribution systems because of small fault current. A novel grounding fault protection based on the sampled current difference between phases is presented in the paper. When the sampling number with the current difference bigger than its threshold is larger than a setting value, ground fault can be detected. The protector is also developed. And it has been verified by EMTP simulations and dynamic power system experimentations. Results show that the protection is free from the impact of arc-grounding faults, and has high sensitivity and reliability to protect all kinds of ground faults.

关 键 词：小电流接地系统 接地保护 故障选线 采样值差动保护 

分 类 号：TM773[电气工程—电力系统及自动化]