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Energies 2018, 11(7), 1775; https://doi.org/10.3390/en11071775

Diagnosis of DC Bias in Power Transformers Using Vibration Feature Extraction and a Pattern Recognition Method

1
State Grid Hunan Electric Power Corporation Research Institute, Changsha 410007, China
2
School of Electrical Engineering, Wuhan University, Wuhan 430072, China
*
Author to whom correspondence should be addressed.
Received: 7 June 2018 / Revised: 23 June 2018 / Accepted: 5 July 2018 / Published: 6 July 2018
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Abstract

DC bias is a great threat to the safe operation of power transformers. This paper deals with a new vibration-based technique to diagnose DC bias in power transformers. With this technique, the DC bias status of power transformers can be automatically recognized. The vibration variation process of a 500 kV autotransformer is tested under the influence of DC bias in the monopole trail operation stage of a ±800 kV HVDC transmission system. Comparison of transformer vibration under normal and DC-biased conditions is conducted. Three features are proposed and are validated by sensitivity analysis. The principal component analysis method is employed for feature de-correlation and dimensionality reduction. The least square support vector machine algorithm is used and verified successful in DC bias recognition. A remote on-line monitoring device based on the proposed algorithm is designed and applied in field DC bias diagnosis of power transformers. The suggested diagnostic algorithm and monitoring device could be useful in targeted DC bias control and improving the safe operation level of power transformers. View Full-Text
Keywords: power transformer; DC bias; feature extraction; pattern recognition; vibration power transformer; DC bias; feature extraction; pattern recognition; vibration
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wu, X.; Li, L.; Zhou, N.; Lu, L.; Hu, S.; Cao, H.; He, Z. Diagnosis of DC Bias in Power Transformers Using Vibration Feature Extraction and a Pattern Recognition Method. Energies 2018, 11, 1775.

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