基于MOA的低成本零相开路线路保护方案  

Low-Cost Zero-Phase Open Circuit Protection Scheme Based on ZnO Varistor

作　　者：梁小华 杨欢红 薛冰 程祥群 傅冬生 孙彦 LIANG Xiaohua;YANG Huanhong;XUE Bing;CHENG Xiangqun;FU Dongsheng;SUN Yan(State Grid Xuancheng Electric Power Supply Company,Xuancheng 242000,China;Shanghai University of Electric Power,Shanghai 200090,China)

机构地区：[1]国网安徽省电力有限公司宣城供电公司,安徽宣城242000 [2]上海电力大学,上海200090

出　　处：《电器与能效管理技术》2021年第7期78-82,共5页Electrical & Energy Management Technology

基　　金：国网安徽省电力有限公司科技项目(SGAHXC00FCJ2000180)。

摘　　要：由零相开路引发的三相四线制系统中性点位移,进而造成电力用户过电压损坏设备的问题,至今仍是供电部门的痛点。随着用户谐波型负荷的增多,中性线过流烧坏导致零相开路过电压的事故案例也日益增多,低压配网的中性线分支多,只有在终端用户安装过电压保护断路器才能解决这一问题,然而成本较高的过电压保护断路器广泛应用受到限制。针对单相用户,提出一种针对利用ZnO压敏电阻,结合既有剩余电流保护器的零相开路线路保护方案,能够在系统发生零相开路过电压时快速可靠动作,保护线路,并且成本较低,具备实用价值。The neutral point displacement of the three-phase four-wire system caused by the zero-phase open circuit,which leads to the over voltage damage of the equipment by power users,is still a pain point in the power supply sector.With the increase of the user’s harmonic load,there are more and more accidents that cause zero-phase open circuit overvoltage due to the zero line overburning,Only that terminal users install voltage protection circuit breakers can it solve this problem.However,the overvoltage protection circuit breakers are expensived to be widely applied.This paper proposes a zero-phase open circuit protection scheme using zinc oxide varistor combined with existing residual current protection devices for single phase user.In the case of zero-phase open circuit overvoltage,it can complete the reaction action quickly and reliably to protect the circuit,and has a low cost,which has very good practical value.

关 键 词：ZNO压敏电阻 过电压保护断路器 谐波负荷 剩余电流保护器 

分 类 号：TM774[电气工程—电力系统及自动化]