摘要
隔离开关切合小电容电流时产生的ＶＦＴＯ会对３００ｋＶ以上的ＧＩＳ造成危害，而对３００ｋＶ以下系统的影响则不大，对这个现象目前还没有满意的解释。本文通过计算，对ＶＦＴＯ的影响因素进行了研究。结果表明，当电压等级高于３００ｋＶ时，变压器入口电容和母线侧的电容电流明显增加，使得ＶＦＴＯ的倍数增高。
Practices show that while the very fast transient overvoltage (VFTO) generated by disconnector operation has negligible influence on gas insulated substations (GIS) below 300kV, it may bring great dangers when voltage level is above 300kV. There is no satisfactory explanation of the phenomenon by now. This paper presents analysis on the factors influencing VFTO based on calculations.It is proved that the per unit value of VFTO is higher for higher operating voltages because the capacitive current being switched and the transformer′s entrance capacitance of GIS above 300kV increase apparently.
出处
《电网技术》
EI
CSCD
北大核心
1998年第1期1-3,共3页
Power System Technology
基金
国家教委博士点基金
关键词
过电压
GIS
超高压
变电站
Very fast transient overvoltage (VFTO) Gas insulated substation (GIS) Insulation co ordination
