摘要
针对输电线路分布电容对差动保护的影响,提出了一种克服电容电流对其影响的保护方案。线路正常运行时,将相电流差动保护的定值整定为线路电容电流的2倍以上,零负序差动保护的定值整定为线路电容电流的1.5倍以上,可靠躲过线路正常运行时的电容电流。在线路空充时,将各差动保护的定值提高两倍同时增加一定的时延,可靠躲过暂态电容电流对各差动保护的影响。
Based on the analysis about the influence of the distributed capacitance current of EHV transmission line on differential current protection, a protection scheme is proposed. The setting value of segregated phase current differential protection is setted 2 times than capacitance current of line while normal operating, negative or zero differential protection setting value are setted 1.5 times than capactitance current. When line charging power, all differential current setting values increase double with some time delay it can avoid the influence of transient capacitance current on all differential protection.
出处
《继电器》
CSCD
北大核心
2006年第15期5-9,共5页
Relay
关键词
线路电流差动保护
电容电流
输电线路
line current differential protection
capacitance current
transmission line
