220kV变压器高压套管末屏故障原因分析与处理

华电技术 ›› 2011, Vol. 33 ›› Issue (7): 45-47.

220kV变压器高压套管末屏故障原因分析与处理

唐嘉宏

广东惠州天然气发电有限公司，广东惠州516082

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2011-07-25 发布日期:2011-07-25

Analysis on reasons of high voltage bushing end shield fault of 220kV transformer and treatment

TANG Jiahong

Guangdong Huizhou Natural Gas Power Generation Company Limited, Huizhou 516082, China

Received:1900-01-01 Revised:1900-01-01 Online:2011-07-25 Published:2011-07-25

摘要/Abstract

摘要： 某电厂1台220kV变压器高压侧B相套管末屏存在严重放电痕迹，套管内绝缘油中检验出超标的乙炔，通过分析，判断故障原因为套管在线检测装置设计、安装存在缺陷，导致运行中末屏接地线断裂，末屏悬浮电位升高而放电。提出了一种现场不排油更换套管的方法，节约了大量的人力、物力，缩短了检修工期。

关键词: 变压器, 高压套管, 末屏, 故障

Abstract: There were serious electric discharge vestiges existing in high voltage side phase B bushing end shield of the 220kV transformer in a power plant. The acetylene exceeding the standard was inspected out in the insulating oil in the bushing. Based on analysis, it was judged that the fault reason is the defects of the bushing onhline detecting device in its design and installation, which cause the end shield grounding wire to be broken in operation, the end shield was in suspension, its electric potential was raised and the electric discharge was occurred. A new site bushing replacing method was put forward, in which the discharge of the transformer oil is not needed. By using this method, a mass of manpower and material resource was saved, and the repair time duration was shortened.

Key words: transformer, high voltage bushing, end shield, fault

唐嘉宏. 220kV变压器高压套管末屏故障原因分析与处理[J]. 华电技术, 2011, 33(7): 45-47.

TANG Jiahong. Analysis on reasons of high voltage bushing end shield fault of 220kV transformer and treatment[J]. Huadian Technology, 2011, 33(7): 45-47.

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