华电技术 ›› 2018, Vol. 40 ›› Issue (2): 25-28.

• 技术交流 • 上一篇    下一篇

500kV主变压器套管末屏漏油原因分析与处理

  

  1. 安徽华电芜湖发电有限公司,安徽芜湖〓241080
  • 出版日期:2018-02-25 发布日期:2018-03-28

Causes analysis and treatment of end shield oil leak in 500kV main transformer bushing

  1. Anhui Huadian Wuhu Power Generation Company Limited,Wuhu 241080,China
  • Online:2018-02-25 Published:2018-03-28

摘要:

某发电厂500kV主变压器检修中发现高压侧套管末屏漏油,通过分析,确认漏油原因为末屏未接地。详细介绍了高压套管更换过程和局部放电试验。更换后解体检查发现该变压器做介损试验时损伤了末屏接地线柱,接地铜套卡涩,不能完全弹起,针对故障原因提出了具体的防范措施。

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Abstract:

A 500kV main transformer of a power plant found oil leak defect at its bushing end shield of the high voltage side during overhaul. Through analysis, it was confirmed that the reason for oil leak was ungrounded end shield. It introduced the replacement of high voltage bushing and partial discharge test in details. After replacement, it was found that the end shied ground column was damaged during the dielectric dissipation test of transformer through disassembly check and the grounded copper sleeve was jammed and could not bounce fully. Countermeasure was carried out according to the causes of the defect.

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