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| Case analysis of insulation oil aging leading to a decrease of transformer insulation resistance |
| CHEN Na1, XU Hao1, DING Jiale1, JIA Qianqian1, LI Zhangcheng2 |
1. Tebian Electric Apparatus Technology Investment Co., Ltd, Tianjin 301700;
2. Tebian Electric Apparatus Hengyang Transformer Co., Ltd, Hengyang, Hu’nan 421007 |
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Abstract During the routine test in the factory, the insulation resistances of high voltage winding to ground, medium voltage winding to ground and low voltage winding to ground of a 500kV transformer are tested, and the results deviate from those of transformers in the same batch and type, which did not meet the requirements of the national standard. In this paper, starting from the transformer production process, the factors that may lead to the reduction of insulation resistance of the transformer are investigated and verified. Ultimately, the insulating oil aging is determined to be the main factor. According to this result, the insulation oil is replaced and the fault is successfully eliminated.
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Received: 04 July 2024
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| Cite this article: |
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CHEN Na,XU Hao,DING Jiale等. Case analysis of insulation oil aging leading to a decrease of transformer insulation resistance[J]. Electrical Engineering, 2024, 25(9): 80-84.
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| URL: |
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http://dqjs.cesmedia.cn/EN/Y2024/V25/I9/80
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2024, Vol. 25 
