一起有载分接开关带电补油致气体继电器误动事故分析  

Analysis on misoperation of gas relay caused by oil replenishment of on load tap changer with load

作　　者：乔胜亚 周鸿铃 朱晨 杨森 李光茂 QIAO Shengya;ZHOU Hongling;ZHU Chen;YANG Sen;LI Guangmao(Electric Power Test and Research Institute of Guangzhou Power Supply Bureau,Guangzhou 510410)

机构地区：[1]广州供电局电力试验研究院,广州510410

出　　处：《电气技术》2022年第10期86-90,95,共6页Electrical Engineering

基　　金：南网科技项目“基于阵列声音传感器的敞开式设备振动特性研究与探测设备研制”(GZ080037KK52200004)。

摘　　要：本文以一起在220kV变压器带电工况下对有载分接开关补油导致气体继电器误动事故为例,通过计算流体动力学(CFD)数值仿真,对比带电/停电补油过程中有载分接开关内部油流特性,得到气体保护误动的原因是带电情况下补油油温高于停电情况下。分析不同补油油温、开关内部不同油温、补油阀门突然关闭对气体继电器流速的影响,结果表明补油油温对气体继电器稳态平均速度影响较大,而有载分接开关内部油温对最大平均速度影响较大,同时补油过程中阀门突然关闭不会导致气体继电器误动。最后针对有载分接开关带电补油作业提出建议。In this paper, taking a misoperation accident of gas relay caused by oil replenishment of on load tap changer under live working condition of 220kV transformer as an example, through computational fluid dynamics(CFD) numerical simulation, the internal oil flow characteristics of on load tap changer during live/power-off oil replenishment process are compared, and it is concluded that the cause of gas protection misoperation is that the temperature of oil replenishment under live condition is higher than that under power-off condition. The influences of different oil temperature, different oil temperature inside the switch, and sudden closing of the oil makeup valve on the flow rate of the gas relay are analyzed. The results show that the oil temperature inside the oil makeup has a great influence on the steady-state average speed of the gas relay, while the oil temperature inside the on load tap changer has a great influence on the maximum average speed. At the same time, the sudden closing of the valve during the oil makeup process will not cause the misoperation of the gas relay. Finally, some suggestions are put forward for the live oil replenishment of on load tap changer.

关 键 词：气体继电器 有载分接开关 带电补油 数值仿真 

分 类 号：TM58[电气工程—电器] TM403.4