光纤差动保护补偿电容电流的一种策略  

A method for compensating capacitance current influence on line current differential protection

作　　者：常宝波[1] 刘力军[2] 韩韫[1] 徐广腾[1] 

机构地区：[1]烟台东方电子信息产业股份有限公司保护部,山东烟台264000 [2]河北经贸大学信息技术学院,河北石家庄050061

出　　处：《继电器》2006年第15期5-9,共5页Relay

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.

关 键 词：线路电流差动保护 电容电流 输电线路 

分 类 号：TM77[电气工程—电力系统及自动化]