摘要
影响快速暂态过电压(very fast transient overvoltage,VFTO)因素很多,其中气体变电站(GIS)设备模型的选择对VFTO计算结果精确度的影响不可忽略。笔者采用考虑弧道电感特性的电弧电阻模型,结合国外某1 000 k V GIS变电站,详细计算了GIS内部的VFTO,分析了GIS内部关键设备处VFTO的极值。结果表明,用考虑弧道电感特性的电弧电阻模型模拟隔离开关的电弧的物理过程,进而对VFTO研究是适用的。最后还研究了入口电容、静态电感、GIS支路长度对VFTO的影响。
Taking a foreign 1 000 kV gas transformer substation（GTS） as example, the very fast transient overvoltage （VFFO）in the GTS is calculated by using the arc resistance model considering arc inductance characteristic,and the extreme of VFFO at key equipment in the GTS is analyzed. Results show that the arc resistance model can correctly simulate the physical process of arc in the isolating switch for analyzing the VFTO. Moreover, the effects of the intake capacitance, the static inductance, and the GIS branch length on VFTO are investigated.
出处
《高压电器》
CAS
CSCD
北大核心
2015年第1期105-109,共5页
High Voltage Apparatus
关键词
VFTO
电感
电弧电阻
入口电容
支路长
VFTO
inductance
arc resistance
intake capacitance
branch length
