合闸涌流对真空断路器重击穿特性的影响  

Impact of inrush current on restrike characteristics of vacuum circuit breaker

作　　者：杨和 Yang He(Cooper(Ningbo)Electric Co.,Ltd,Ningbo,Zhejiang 315336)

机构地区：[1]库柏(宁波)电气有限公司

出　　处：《电气技术》2019年第11期68-72,81,共6页Electrical Engineering

摘　　要：真空开断技术已广泛应用于电力系统,但真空断路器在电容器组应用中仍存在问题,无法满足其投切要求,原因在于合闸涌流会破坏真空断路器绝缘性能。本文进行了在容性电流投切过程中合闸涌流影响真空灭弧室重击穿特性的试验研究。试验过程中分别对7.2kV和40.5kV等级真空断路器进行了电容器组投切试验。试验结果表明合闸涌流会直接影响触头表面状态,进而影响重击穿现象。当涌流幅值从0上升到5kA,7.2kV等级真空灭弧室重击穿概率会从5%上升到30%;当涌流幅值从4kA上升到5kA,40.5kV等级真空灭弧室重击穿概率会从3%上升到20%;此外,合闸涌流也会影响重击穿发生时间,随合闸涌流幅值上升,重击穿发生时间显著提前。Although the vacuum technology is commonly used in power system,challenges still exist for vacuum circuit breakers(VCBs)to cope with the requirements of capacitor bank switching duties as the insulation performance can be the deteriorated by the inrush current.The objective of this paper is to investigate an impact of the inrush current on the restrike characteristics of vacuum interrupters(VIs).The capacitor bank switching tests are carried out for 7.2kV and 40.5kV VCBs.The experimental results show that the restrike phenomena are significantly influenced by the contact surface conditions damaged by the inrush current.The restrike probability increases from 5%to 30%with the increase of the inrush current from 0 to 5kA for 7.2kV VIs.The restrike probability increases from 3%to 20%with the increase of the inrush current from 4kA to 5kA for 40.5kV VIs.In addition,the inrush current could also impact the occurring time of restrike.The higher the inrush current is,the restrike tends to occur earlier during the recovery voltage applied period.

关 键 词：真空断路器 真空灭弧室 合闸涌流 电容器投切 重击穿 

分 类 号：TM5[电气工程—电器]