摘要
以近期在工程中发生的单相接地引起电压互感器高压熔断器熔断事件为例,分析故障后的电压波型,并根据在实验室做出的电压互感器铁心的励磁特性,计算不接地相电压互感器在电压切换过程中的冲击电流,说明间歇性单相接地可能是导致电压互感器高压熔断器熔断或电压互感器高压绕组损毁的重要因素。
The fault wave based on the examples of potential transformer high voltage fuse fusing caused by single-phase grounding recently is analyzed. According to the characteristics of PT core excitation, the inrush current of ungrounded PT in the voltage switching process is calculated. The intermittent single-phase grounding may be the important factors leading to PT high voltage fuse fusing or PT high voltage windings damage is discussed.
出处
《自动化应用》
2013年第3期80-82,共3页
Automation Application
基金
由中央高校基本科研业务费(CDJZR12110024)资助
关键词
35kV电网
单相接地
电压互感器
励磁涌流
35kV power grid
single-phase grounding
potential transformer
magnetizing inrush current
