电瓷避雷器Issue(4)：29-36,8.DOI:10.16188/j.isa.1003-8337.2024.04.004
一起氧化锌电阻片侧面绝缘釉层短路引起的避雷器故障分析
Arrester Fault Caused by the Short Circuit of Side Insulating Coating of Zinc Oxide Resistor
摘要
Abstract
With the wide application of metal zinc oxide arresters in power systems,damage faults due to aging,moisture,environmental pollution and other reasons happen quite often.For a damage defect of abnormal heating of a 500 kV line zinc oxide resistors,through the analysis of live detection,power off detection and inspection under disassembled condition,the cause of the defect was found that there was no drainage hole at the lower flange of the arrester,which caused the explosion-proof plate rusted,re-duced its strength and damaged after long-term exposure to acidic rainwater.Moisture intrusion into the arrester cavity causes damping of the valve blocks,and the performance of the side insulating coating of valve blocks decreases and leads to short-circuit breakdown.Then,through drying the damp valve blocks and knocking out the side insulating coating of valve blocks,it was further verified that the leakage current increased due to the short circuit of the side insulating coating of valve blocks.After the short-circuit breakdown of the side insulating coating of the partial valve blocks,the charge rate of the normal valve blocks increases,which further accelerates the deterioration.Finally,the entire valve block column in the upper section breaks down along the side insulating coating.Corresponding preventive measures are put forward according to the cause of the fault.关键词
金属氧化物避雷器/氧化锌电阻片/受潮/绝缘釉层/排水孔Key words
metal oxide arrester/zinc oxide resistor/damp/insulation coating/drainage hole引用本文复制引用
贾焦仁,严明..一起氧化锌电阻片侧面绝缘釉层短路引起的避雷器故障分析[J].电瓷避雷器,2024,(4):29-36,8.基金项目
中央高校基本科研业务费专项资金(编号:2022MS074).Project supported Special Fund for Basic Research Business Expenses of Central Universities(No.2022MS074). （编号:2022MS074）
