摘要
在小电流接地系统中,由于PT励磁电感的非线性特性,在一定条件下容易产生铁磁谐振过电压,给系统的安全运行带来严重隐患。近年来,供电系统大都用在PT中性点串接第四支PT的方法来消除其谐振。随着智能电网目标的提出,消谐PT二次接线不统一的特点亟待解决,同时也影响了运行人员的正确判断。重点分析几种目前常见的PT消谐的原理,运行时的注意事项,为以后整改及优化提供一定的依据。
In the neutral node ungrounded power system,ferroresonance due to the nonlinear excitation inductance of three-phase inductive potential transformer（PT） once happened,has a serious impact on the safe operation of power system.In recent years,connecting single-phase PT to the neutral point of three-phase PT high voltage side is used by most power systems.With the proposed of Smart Grid,the non-normative connection mode of secondary circuits of the anti-resonance PT is urgent to solve,it also affects the judgment of the operators.This paper mainly analyses the common anti-resonance PT of working principles and considerations in operation,offers references for optimization and rectification of the anti-resonance PT.
出处
《华中电力》
2010年第5期43-46,51,共5页
Central China Electric Power
关键词
小电流接地系统
消谐
电压互感器
接线方式
the neutral node ungrounded power system
ferroresonance elimination
potential transformer
wirings＇ connections
