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| Experiment on Vibro-Acoustic Characteristic of 500kV Single-Phase Transformer under DC-Bias |
| Li Bing1,2, Wang Zezhong1, Liu Haibo3, Li Haiming3, Liu Jianben2 |
1. Beijing Key Laboratory of High Voltage & EMC North China Electric Power University Beijing 102206 China;
2. State Key Laboratory of Power Grid Environmental Protection China Electric Power Research Institute Wuhan 430074 China;
3. State Grid East Inner Mongolia Electric Power Company Hohhot 010010 China |
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Abstract DC bias is an abnormal working state of transformer. The main effect of a DC current flowing into a transformer winding is the half-cycle magnetic core saturation, as a result, a series of problems occur, such as the serious distortion of excitation current, partial overheating and increase of vibro-acoustic noise. The big capacity single-phase autotransformer has less tolerance to the DC bias current, which have a serious threat to the safe and stable operation of the power grid. In this paper, two identical 250MV·A/500kV transformers are used for DC bias experiments with and without load. The voltage distortion rate, excitation current, vibration and noise under DC bias of the transformer are measured, and the variation, distribution and harmonics spectrum characteristics under DC bias are analyzed. The test results would provide a reference for the assessment of DC endurance capability and the study of vibro-acoustic noise characteristics of large capacity transformers in actual operation.
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Received: 22 June 2020
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| Fund:国家重点研发计划（2016YFC0800100）和电网环境保护国家重点实验室开放基金（GYW51201901088）资助项目 |
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2021, Vol. 36 
