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Study on Ageing of NBR Sealing Ring for High Voltage Power Transformer in Extremely Low Temperature
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Wenfeng LIU1, Xuemei ZHENG1, Ziqi ZHANG1, Yiyan AN2, Xiaohong CHI1
Insulating Materials | 2022, 55(8) : 72 - 75
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Insulating Materials | 2022, 55(8): 72-75
• Insulation Technology •
Study on Ageing of NBR Sealing Ring for High Voltage Power Transformer in Extremely Low Temperature
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Wenfeng LIU1, Xuemei ZHENG1, Ziqi ZHANG1, Yiyan AN2, Xiaohong CHI1
Affiliations
  • 1State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 071000, China
  • 2State Grid East Inner Mongolia Electric Power Research Institute, Hohhot 010090, China
Published: 2022-08-20 doi: 10.16790/j.cnki.1009-9239.im.2022.08.012
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In order to study the reliability of nitrile butadiene rubber (NBR) sealing element under the action of extremely low temperature and oil medium, the mechanical properties and microstructure of sealing rings in high-voltage transformers in extremely cold regions were studied. The mechanical characteristics, morphology change, chemical structure characteristics, and thermal response characteristics of the sealing ring after serviced for one year in extremely cold environment were obtained by tensile test, micron indentation test, scanning electron microscope (SEM), infrared spectrum (FTIR), and differential scanning thermal analysis (DSC). The results show that the elastic modulus and hardness of NBR sealing ring decrease in extremely cold environment, which leads to the loss of sealing effect. This is because the surface of sealing ring swell under the joint action of low temperature and oil medium, and micro-cracks appear. Oil immersion in NBR makes the molecular chain spacing increase, and the compliance of main chain of NBR is improved, meanwhile, the molecular structure of NBR changes due to the hydrolysis reaction of cyanide group.

NBR  /  extremely low temperature  /  ageing  /  oil medium  /  sealing ring
Wenfeng LIU, Xuemei ZHENG, Ziqi ZHANG, Yiyan AN, Xiaohong CHI. Study on Ageing of NBR Sealing Ring for High Voltage Power Transformer in Extremely Low Temperature[J]. Insulating Materials, 2022 , 55 (8) : 72 -75 . DOI: 10.16790/j.cnki.1009-9239.im.2022.08.012
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2022.08.012
  • Receive Date：2021-08-29
  • Online Date：2025-12-23
  • Published：2022-08-20
Article Data
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History
  • Received：2021-08-29
  • Revised：2021-10-25
Funding
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    1State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 071000, China
    2State Grid East Inner Mongolia Electric Power Research Institute, Hohhot 010090, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2022.08.012
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Citations
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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