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Research on breakdown characteristics and gas generation law of turn-to-turn insulation in natural ester transformer under lightning impulse voltage
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Penghong GUO1, Qing LI2, Yinghui DU1, Dongdi LIU1, Lei YAN1, Xinbing WANG1, Ming DONG2, Yadong XING2, Yongwei XU3
Insulating Materials | 2024, 57(12) : 124 - 129
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Insulating Materials | 2024, 57(12): 124-129
• Test and Analysis •
Research on breakdown characteristics and gas generation law of turn-to-turn insulation in natural ester transformer under lightning impulse voltage
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Penghong GUO1, Qing LI2, Yinghui DU1, Dongdi LIU1, Lei YAN1, Xinbing WANG1, Ming DONG2, Yadong XING2, Yongwei XU3
Affiliations
  • 1Shandong Electric Power Equipment Co., Ltd., Jinan 250022, China
  • 2State Key Laboratory of Electrical Insulation and Power Equipment, Xi′an Jiaotong University, Xi′an 710049, China
  • 3Shandong Power Transmission and Transformation Equipment Co., Ltd., Jinan 250104, China
Published: 2024-12-20 doi: 10.16790/j.cnki.1009-9239.im.2024.12.016
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Due to its advantages of high flash point, high ignition point, and biodegradability, natural ester insulating oil is gradually being promoted and applied in high voltage level power transformers. In order to provide basic data support for the insulation structure design of high voltage and large capacity natural ester transformer, we took mineral oil as a reference, and selected natural ester insulating oil as the test object to analyze its breakdown characteristics and gas generation law under lightning impulse voltage. The results show that the lightning impulse breakdown voltage of natural ester turn-to-turn insulation is above 200 kV, with the increase of turn-to-turn insulation thickness and insulation gap distance, it shows an upward trend and is slightly lower than the breakdown voltage of mineral oil under the same conditions. H2 and C2H2 dissolved in oil are the main characteristic gases under lightning impulse voltage, and their relative percentage content increases with the increase of insulation gap. The Duval pentagon method is used for fault diagnosis of dissolved gases in oil, and the discharge at the fault points are basically diagnosed as high-energy discharge, which are consistent with the energy released by lightning impulse.

natural ester transformer  /  turn-to-turn insulation  /  lightning impulse  /  breakdown characteristics  /  dissolved gas in oil
Penghong GUO, Qing LI, Yinghui DU, Dongdi LIU, Lei YAN, Xinbing WANG, Ming DONG, Yadong XING, Yongwei XU. Research on breakdown characteristics and gas generation law of turn-to-turn insulation in natural ester transformer under lightning impulse voltage[J]. Insulating Materials, 2024 , 57 (12) : 124 -129 . DOI: 10.16790/j.cnki.1009-9239.im.2024.12.016
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Year 2024 volume 57 Issue 12
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doi: 10.16790/j.cnki.1009-9239.im.2024.12.016
  • Receive Date：2023-06-01
  • Online Date：2025-12-24
  • Published：2024-12-20
Article Data
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History
  • Received：2023-06-01
  • Revised：2024-08-16
Affiliations
    1Shandong Electric Power Equipment Co., Ltd., Jinan 250022, China
    2State Key Laboratory of Electrical Insulation and Power Equipment, Xi′an Jiaotong University, Xi′an 710049, China
    3Shandong Power Transmission and Transformation Equipment Co., Ltd., Jinan 250104, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
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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