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Influence of natural ester insulating oil on main and longitudinal insulation strength of 110 kV power transformer
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Jianmin WANG1, 2, 3, Dongxu YU1, 2, Haoming WANG1, 2, 4, Zhenbin DU3, Lanrong LIU3, Dongsheng LIU3
Insulating Materials | 2023, 56(1) : 62 - 69
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Insulating Materials | 2023, 56(1): 62-69
• Insulation Technology •
Influence of natural ester insulating oil on main and longitudinal insulation strength of 110 kV power transformer
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Jianmin WANG1, 2, 3, Dongxu YU1, 2, Haoming WANG1, 2, 4, Zhenbin DU3, Lanrong LIU3, Dongsheng LIU3
Affiliations
  • 1State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China
  • 2Key Laboratory of Electro-magnetic Field and Electrical Apparatus Reliability of Hebei Province, Hebei University of Technology, Tianjin 300130, China
  • 3Hebei Province Key Laboratory of Electromagnetic and Structural Performance of Power Transmission and Transformation Equipment, Baoding Tianwei Baobian Electric Co., Ltd., Baoding 071056, China
  • 4Department of Power Engineering, North China Electric Power University, Baoding 071003, China
Published: 2023-01-20 doi: 10.16790/j.cnki.1009-9239.im.2023.01.010
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In order to analyze the influence of natural ester insulating oil on the insulating properties of power transformers, at first, the winding wave processes of a 110 kV natural ester insulating oil and a mineral insulating oil power transformers with the same insulation structure were calculated, and the longitudinal insulation margins of the two transformers were obtained. And then, the winding potential with linear distribution under power frequency and the nonlinear winding potential calculated by wave process were used as excitation sources respectively, the composite electric field of the two insulating oil transformers main insulation were simulated, and their distribution characteristics were compared and analyzed. At last, the main insulation margins of the two insulating oil transformers were calculated by using the whole-region electric flux line scanning method, and in view of the weak main insulation strength of natural ester insulating oil transformer, the structure was improved and the improvement effect was analyzed. The results show that through adding insulation paper boards and adjusting the size of oil ducts, the minimum insulation margin of the improved natural ester insulating oil transformer increases by 15.8%, which meets the requirements of main insulation strength, which provides a reference for developing large natural ester insulating oil transformer and optimizing its structure.

natural ester insulating oil  /  power transformer  /  wave process  /  main and longitudinal insulation strength  /  structure optimization
Jianmin WANG, Dongxu YU, Haoming WANG, Zhenbin DU, Lanrong LIU, Dongsheng LIU. Influence of natural ester insulating oil on main and longitudinal insulation strength of 110 kV power transformer[J]. Insulating Materials, 2023 , 56 (1) : 62 -69 . DOI: 10.16790/j.cnki.1009-9239.im.2023.01.010
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2023.01.010
  • Receive Date：2021-12-20
  • Online Date：2025-11-21
  • Published：2023-01-20
Article Data
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History
  • Received：2021-12-20
  • Revised：2022-01-27
Funding
Affiliations
    1State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China
    2Key Laboratory of Electro-magnetic Field and Electrical Apparatus Reliability of Hebei Province, Hebei University of Technology, Tianjin 300130, China
    3Hebei Province Key Laboratory of Electromagnetic and Structural Performance of Power Transmission and Transformation Equipment, Baoding Tianwei Baobian Electric Co., Ltd., Baoding 071056, China
    4Department of Power Engineering, North China Electric Power University, Baoding 071003, China
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表12种不同金属材料的力学参数
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小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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