[1]任大江,叶海鹏,李建萍,等.一起500 kV金属氧化锌避雷器故障原因分析[J].电瓷避雷器,2020,(03):127-132.[doi:10.16188/j.isa.1003-8337.2020.03.021]
 REN Dajiang,YE Haipeng,LI Jianping,et al.Analysis of the Causes of a 500 kV Metal Zinc Oxide Arrester Fault[J].,2020,(03):127-132.[doi:10.16188/j.isa.1003-8337.2020.03.021]
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一起500 kV金属氧化锌避雷器故障原因分析()
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《电瓷避雷器》[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2020年03期
页码:
127-132
栏目:
避雷器
出版日期:
2020-06-25

文章信息/Info

Title:
Analysis of the Causes of a 500 kV Metal Zinc Oxide Arrester Fault
作者:
任大江1 叶海鹏1 李建萍1 刘泽宇1 闫斌斌2
(1.国网冀北电力有限公司张家口供电公司, 河北 张家口 075000; 2.国网山西省电力公司检修分公司 太原 030000)
Author(s):
REN Dajiang1 YE Haipeng1 LI Jianping1 LIU Zeyu1 YAN Binbin2
(1.State Grid Jbei Electric Power Co., Ltd., Zhangjiakou Power Supply Company, Zhangjiakou 075000, China; 2.State Grid Maintenance Company of Shanxi Province, Taiyuan 030000, China)
关键词:
金属氧化物避雷器 排水孔 氧化锌电阻片 绝缘涂层 缺陷
Keywords:
metal oxide arrester drain hole zinc oxide valve block insulation coating defect
DOI:
10.16188/j.isa.1003-8337.2020.03.021
摘要:
金属氧化物避雷器通过迅速释放过电压能量而保护与其并联的各种电气设备免受高电压影响。针对一起500 kV线路避雷器电阻片外绝缘涂层受损的缺陷,通过红外测温、带电检测和直流参考电压试验数据、现场解体试验分析查明故障原因为上节避雷器下法兰位置无排水孔,积水侵入避雷器内部引起上节顶部氧化锌电阻片外部绝缘涂层劣化击穿。由于局部氧化锌电阻片绝缘击穿导致电阻片串整体电压分布不平衡,正常电阻片荷电率增加,进一步加速劣化,最终导致上节氧化锌电阻片外绝缘涂层全部击穿,并根据缺陷原因提出了相应的预防措施。
Abstract:
Metal oxide arrester protects in parallel electrical equipment from high voltage by rapidly releasing over-voltage energy. For a 500 kV line surge arrester zinc oxide valve block insulation coating damage defects,through the analysis of infrared thermometry, live detection and DC reference voltage test data,inspection under disassembled condition pinpointed the cause.It was found that there was no drain hole in the lower flange of the upper section arrester, and the water invaded into the interior of the arrester and caused the deterioration of the external insulating coating of the zinc oxide valve block on the top of the upper part. Due to the partial breakdown of the insulation of the zinc oxide valve block, the overall voltage distribution of the valve block series is unbalanced, the charge rate of the normal valve block increases, further accelerates the block deterioration, and finally leads to the breakdown of the insulation coating outside the zinc oxide valve block of the upper section.The corresponding preventive measures are put forward according to the defect.

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备注/Memo

备注/Memo:
收稿日期:2019-10-25 作者简介:任大江(1983—),男,硕士,高级工程师,主要研究方向为电力系统及其自动化。
更新日期/Last Update: 2020-07-07