霍北季 黄智明 邓东辉


摘要:10kV高压计量保险管故障更换时需要采取停电处理的措施,但是在此过程中存在与用户约时停电难、影响客户生产计划等问题。本文针对上述情况,提出研发出一种辅助操作工具实现带电更换10kV高压计量保险管的方案,并且详细讲述了方案的具体内容、实施方式以及应用前景,从而为解决该类故障提供了依据,也希望可以为今后相关研究提供有价值的参考。
关键词:10kV高压计量保险管 带电更换 辅助操作工具 熔断
Research and Development of Auxiliary Operation Tools for Live Replacement of 10kV High Voltage Metering Fuse
HUO Beiji HUANG Zhiming DENG Donghui
(Jiangmen Power Supply Bureau of Guangdong Power Grid Co. Ltd., Jiangmen,Guangdong Province,529000 China)
Abstract:When the 10kV high voltage metering fuse fails to be replaced, it is necessary to take measures to deal with power outage, but in this process, there are problems such as difficult power outage when making an appointment with the customer and affecting the customer's production plan. According to the above situation, puts forward the development of a kind of auxiliary operation tools to implement and charged replaced 10 kV high voltage metering insurance scheme, and detailed plan of the specific content, way of implementation and application prospect, which provide the basis to solve the fault, also hope can provide valuable reference for the related research in the future.
Key Words: 10kV high voltage metering fuse; Live replacement; Auxiliary operation tools; Fusing
1.背景技術
保险管是最简单和最早使用的一种保护电器[1-2],其工作原理是:当工作电流在额定电流以下时,较小的电流通过熔体,虽然会使它的温度上升,但熔体不会熔化,电流可靠接通。一旦电路中发生过负荷或短路,电流增大,熔体由于自身温度超过熔点而熔化,将电路切断,保护高压电网不因用户互感器高压绕组或引线故障危及一次系统的安全[3]。电压互感器用的高压保险管采用镍铬丝材料制成,其总电阻约90Ω,可以限制短路电流。计量用的10kV电压互感器使用的保险管额定电流为1A或2A。运行中的10kV电压互感器高压计量保险管熔断的原因有[4]:(1)电压互感器内部线圈发生匝间、层间或相间短路以及一次接地等故障,使电压互感器铁芯饱和,电流急剧增加;(2)二次回路发生短路或接地故障,高压保险管越级熔断;(3)电力系统发生铁磁谐振,电压互感器产生过电压或过电流。
在面对10kV高压计量保险管熔断这种情况时,只能选择停电处理。……