摘要
中性点不接地系统弧光接地产生的过电压国内外有2种不同的理论,即工频熄弧理论和高频熄弧理论。工频熄弧理论过电压倍数仅为3.5倍,它不可能危及设备的安全运行,而高频熄弧理论说明过电压倍数为7.5倍,它能引发系统故障,文中对两起弧光接地过电压事故(二相10 kV母线对地事故和10 kV少油断路器C相对地放电事故)进行了分析,证实高频熄弧理论是正确的。
There are two different theories about over voltage generated by arc grouding in insulated neutral system, arc extinguishing theories of fundamental frequency and high fi＇equency. With fundamental frequency theory, the over voltage can not endanger the safe operation of equipments because it is only 3.5 times. While with high frequency theory, the over voltage can lead to the system faults because it is 7.5 times than normal one. Two faults had been analyzed to prove the correctness of high frequency act extinguishing theory, one is two phase grounding fault of 10 kV bus and another is C-phase grounding fault of 10 kV oil-minimum breaker.
出处
《江苏电机工程》
2012年第2期62-64,共3页
Jiangsu Electrical Engineering
关键词
过电压
工频
高频
接地
弧光
over voltage
fundamental frequency
high frequency
grouding
arc
