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| Evaluation of the oil-paper insulation state of a transformer based on equivalent aging capacitance |
| DOI：10.19783/j.cnki.pspc.240632 |
| Key Words:equivalent circuit frequency domain spectroscopy principal time constant equivalent aging capacitance |
| Author Name | Affiliation | | LIN Zhiyong1,2 | 1. School of Electrical Engineering and Automation, Xiamen University of Technology, Xiamen 361024, China
2. Xiamen Key Laboratory of Frontier Electric Power Equipment and Intelligent Control, Xiamen 361024, China
3. Fujian Electric Power Supplies Limited, Fuzhou 350003, China | | SU Ruohang1,2 | 1. School of Electrical Engineering and Automation, Xiamen University of Technology, Xiamen 361024, China
2. Xiamen Key Laboratory of Frontier Electric Power Equipment and Intelligent Control, Xiamen 361024, China
3. Fujian Electric Power Supplies Limited, Fuzhou 350003, China | | HUANG Guotai3 | 1. School of Electrical Engineering and Automation, Xiamen University of Technology, Xiamen 361024, China
2. Xiamen Key Laboratory of Frontier Electric Power Equipment and Intelligent Control, Xiamen 361024, China
3. Fujian Electric Power Supplies Limited, Fuzhou 350003, China | | LI Ronghua1,2 | 1. School of Electrical Engineering and Automation, Xiamen University of Technology, Xiamen 361024, China
2. Xiamen Key Laboratory of Frontier Electric Power Equipment and Intelligent Control, Xiamen 361024, China
3. Fujian Electric Power Supplies Limited, Fuzhou 350003, China | | ZHANG Damin1,2 | 1. School of Electrical Engineering and Automation, Xiamen University of Technology, Xiamen 361024, China
2. Xiamen Key Laboratory of Frontier Electric Power Equipment and Intelligent Control, Xiamen 361024, China
3. Fujian Electric Power Supplies Limited, Fuzhou 350003, China |
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| Abstract:To address the difficulty in quantitatively analyzing the aging state of transformer oil-paper insulation using frequency domain spectroscopy characteristics, an evaluation method is proposed for analyzing the aging state of oil-paper insulation by equivalent aging capacitance. Firstly, the equivalent circuit of a transformer insulation system is constructed using recovery voltage characteristics. Then, the intrinsic relationship between the parameters of the extended Debye equivalent circuit and the frequency domain spectroscopy is analyzed, and the feasibility of time-frequency domain spectroscopy spectrum interconversion is studied. Finally, through simulation analysis, the influence of changes in equivalent circuit parameters on the real part of a complex capacitance spectrum is examined, and the relationship between equivalent aging capacitance and the main time constant is quantitatively analyzed. The results indicate that there is an exponential relationship between the equivalent aging capacitance and main time constant; the smaller the equivalent aging capacitance, the more severe the aging state of transformer oil-paper insulation. From the relationship between the main time constant and the aging state of the transformer oil-paper insulation, the equivalent aging capacitance range corresponding to different transformer insulation states can be determined, providing a new reference for accurately evaluating the aging state of transformer oil-paper insulation. |
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