35kV电网单相接地引起电压互感器故障的原理研究  

Studies on Potential Transformer Fault Caused by Single-phase Grounding of 35kV Power System

作　　者：陈秘[1] 周劲[1] 何月[2] 林莉[2] 牟道槐[2] 

机构地区：[1]广安电业局邻水供电局,四川邻水638500 [2]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

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

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.

关 键 词：35kV电网 单相接地 电压互感器 励磁涌流 

分 类 号：TM451[电气工程—电器]