摘要
冰闪故障目前已成为超高压直流输电线路的主要故障类型之一;闪络是持续高幅值的泄漏电流融化冰层所致,闪络频率与电压梯度成正比,闪络电压与覆冰类型、覆冰水电导率、覆冰量及气压等有关;影响线路覆冰的因素很多,包括地形、地势以及气候和季节等各种自然因素;本文以±500千伏龙政直流输电线路为例,分析了超高压直流输电线路发生冰闪的共性原因,并据此提出了相应的解决方法。
The ice flash- over is now becoming one of main causes of power failures in EHVDC transmission lines. The flash - over is led by that the continuing high magnitude leakage current thaws the ice covering on the insulators, the frequency of flash - over is in direct ratio to voltage grads which are relative to types, conductance and quantity of the covering ice and the air pressure etc. The factors effecting on covering ice are various, such as terrain, physiognomy, climates, seasons and other natural situation. This article provides the case of ± 500kV Longzheng EHVDC transmission line, on the basis of it, the author analyses the common reasons of ice flash - over in EHVDC transmission lines, and concludes the relevant proposal of solves.
出处
《安徽电气工程职业技术学院学报》
2007年第1期34-36,共3页
Journal of Anhui Electrical Engineering Professional Technique College
关键词
超高压
直流输电
线路冰闪
EHV
DC power transmission
the ice flash -over in transmission lines
