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Analysis on Failure Mechanism of Transformer Sealing Ring in Extremely Cold Area
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Yiyan AN1, Yanwei WANG1, Ruofeng QIN2, Xiaohong CHI3, Xuemei ZHENG3, Wenfeng LIU3
Insulating Materials | 2022, 55(9) : 96 - 99
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Insulating Materials | 2022, 55(9): 96-99
• Test and Analysis •
Analysis on Failure Mechanism of Transformer Sealing Ring in Extremely Cold Area
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Yiyan AN1, Yanwei WANG1, Ruofeng QIN2, Xiaohong CHI3, Xuemei ZHENG3, Wenfeng LIU3
Affiliations
  • 1State Grid East Inner Mongolia Electric Power Research Institute, Hohhot 010010, China
  • 2State Grid East Inner Mongolia Electric Power Company, Hohhot 010010, China
  • 3State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 071000, China
Published: 2022-09-20 doi: 10.16790/j.cnki.1009-9239.im.2022.09.016
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In order to study the failure mechanism of transformer sealing ring in low temperature environment, we collected some failed rubber sealing rings of transformers in extremely cold area, and studied their microstructure and mechanical properties. The changes of micro morphology caused by low temperature and mechanical stress were characterized by scanning electron microscope, the changes of molecular chain structure and thermal motion of rubber samples were characterized by Fourier transform infrared spectroscopy and differential scanning calorimetry, and the changes of micro indentation hardness and reduced Young's modulus of rubber samples were characterized by non-destructive micron indentation test. The results show that due to the long-term joint action of low temperature, insulating oil, and mechanical stress, both the structure and arrangement of the molecular chain in nitrile butadiene rubber (NBR) have changed, resulting in the obvious decrease of micro indentation hardness and reduced Young's modulus of the rubber, and the sealing effect loses.

extremely cold region  /  transformer  /  rubber seals  /  failure mechanism
Yiyan AN, Yanwei WANG, Ruofeng QIN, Xiaohong CHI, Xuemei ZHENG, Wenfeng LIU. Analysis on Failure Mechanism of Transformer Sealing Ring in Extremely Cold Area[J]. Insulating Materials, 2022 , 55 (9) : 96 -99 . DOI: 10.16790/j.cnki.1009-9239.im.2022.09.016
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2022.09.016
  • Receive Date：2021-09-18
  • Online Date：2025-12-23
  • Published：2022-09-20
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History
  • Received：2021-09-18
  • Revised：2021-11-05
Funding
Affiliations
    1State Grid East Inner Mongolia Electric Power Research Institute, Hohhot 010010, China
    2State Grid East Inner Mongolia Electric Power Company, Hohhot 010010, China
    3State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 071000, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2022.09.016
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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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