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| Quantitative Calculation Method of Transformer Oil-Paper Insulation Aging Parameters Based on Frequency Dielectric Spectrum Frequency Range Optimized Calculation |
| Liu Ji1,2, Zhang Mingze1,2, Zhao Chunming3, Cheng Weichao1, Jia Haifeng1, Zhu Bo2 |
1. Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education Harbin University of Science and Technology Harbin 150080 China;
2. State Key Laboratory Breeding Base of Dielectrics Engineering Harbin University of Science and Technology Harbin 150080 China;
3. State Grid Electric Power Research Institute of Jilin Electric Power Co. Ltd Changchun 130021 China |
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Abstract Stable operation of transformers is an important guarantee for the safe operation of power grids. The aging of oil-paper insulation in transformer can be evaluated more accurately by frequency-domain dielectric spectroscopy. The current evaluation methods mostly focus on the evaluation of aging status of single oil-paper insulation. The aging state assessment of transformer equivalent model is less, and the evaluation software is extremely inaccurate. In order to further meet the practical engineering application, in this paper, a numerical method for calculating the aging state of transformer oil-paper insulation based on equivalent model of transformer is presented. The relevant validation was carried out by accelerated aging test. Firstly, the variable temperature dielectric spectroscopy curves of oil-immersed pressboard with different ageing were obtained under laboratory conditions. According to frequency-temperature translation, the activation energy of oil-immersed pressboard with different aging degrees was calculated. The quantitative characterization equation of the degree of polymerization and activation energy of oil-immersed pressboard was established. Secondly, the basic data of oil-immersed pressboard at different test temperatures and aging degrees were obtained by inverted frequency temperature translation method. Finally, the influence of the transformer equivalent model structure on the frequency range of the frequency domain dielectric loss factor was analyzed. By using the proposed frequency-range numerical iteration algorithm, when the goodness of fit between test curve and calculation curve is the best, the degree of polymerization, moisture content of oil-immersed pressboard and conductivity of transformer oil in transformer equivalent XY model can be obtained. Compared with the physical and chemical performance analysis results, the error is small. It can effectively reduce the time of insulation aging assessment of transformers in the field.
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Received: 25 March 2019
Published: 12 May 2020
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2020, Vol. 35 
