一起500 kV避雷器內(nèi)部受潮故障特征與診斷分析
劉昌標(biāo),張翾喆,謝斯晗,丁凱,王志
(國網(wǎng)浙江省電力有限公司超高壓分公司,浙江 杭州 311199)
摘 要:金屬氧化物避雷器是電力系統(tǒng)中重要的防雷和過電壓保護設(shè)備,開展帶電檢測可有效地保證避雷器安全穩(wěn)定運行。介紹了一起新投運的 500 kV 金屬氧化鋅避雷器數(shù)據(jù)異常的典型案例,通過在線監(jiān)測、帶電檢測、停電診斷性試驗確認(rèn)了避雷器內(nèi)部存在嚴(yán)重故障,經(jīng)解體檢查發(fā)現(xiàn),避雷器上節(jié)頂部主蓋板橡膠密封圈安裝質(zhì)量不佳致使避雷器內(nèi)部發(fā)生嚴(yán)重積水受潮是避雷器內(nèi)部故障的直接原因。指出針對新投運設(shè)備建議加強監(jiān)控力度,以便及時有效地發(fā)現(xiàn)潛在缺陷,避免設(shè)備發(fā)生爆炸等嚴(yán)重安全事故。
關(guān)鍵詞:避雷器;帶電檢測;受潮;內(nèi)部故障
中圖分類號:TM862 文獻標(biāo)識碼:B 文章編號:1007-3175(2022)05-0045-04
The Internal Damp Fault Characteristics and Diagnosis
Analysis of a 500 kV Lightning Arrester
LIU Chang-biao, ZHANG Xuan-zhe, XIE Si-han, DING Kai, WANG Zhi
(EHV Branch Company of State Grid Zhejiang Electric Power Company, Hangzhou 311199, China)
Abstract: MOA is a piece of crucial equipment for lightning protection and overvoltage protection in power systems, and carrying out live detection could effectively ensure the safe and stable operation of the arrester.This paper introduced a typical case of abnormal data of a 500 kV metal zinc oxide arrester which was put into operation newly. It has been confirmed that there was a severe fault inside the arrester through online monitoring, live detection, and power failure diagnostic tests.After disintegration inspection, it was found that the poor installation quality of the rubber sealing ring of the main cover on the top of the upper section of the arrester caused serious water accumulation inside the arrester, and dampness is the direct cause of the internal failure of the arrester.This paper points out that it is necessary to strengthen the monitoring of the new equipment to detect potential defects in time and avoid serious safety accidents such as
equipment explosions, etc.
Key words: lightning arrester; live detection; damp; internal fault
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