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Pyrolysis Gas Production Law of Dodecylbenzene and Fault Diagnosis of Oil-filled Cable Based on DGA
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Jianping LIAO1, Jinwei CHU1, Fan GAO1, Yufei CHEN1, Xingwei LIU2, Chen ZHANG2, Huaqiang LI2, Lisheng ZHONG2
Insulating Materials | 2021, 54(8) : 109 - 114
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Insulating Materials | 2021, 54(8): 109-114
• Test and Analysis •
Pyrolysis Gas Production Law of Dodecylbenzene and Fault Diagnosis of Oil-filled Cable Based on DGA
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Jianping LIAO1, Jinwei CHU1, Fan GAO1, Yufei CHEN1, Xingwei LIU2, Chen ZHANG2, Huaqiang LI2, Lisheng ZHONG2
Affiliations
  • 1Maintenance and Test Center of EHV Transmission Company of China Southern Power Grid Co., Ltd., Guangzhou 510405, China
  • 2State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China
Published: 2021-08-20 doi: 10.16790/j.cnki.1009-9239.im.2021.08.017
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In order to verify the applicability of DGA fault diagnosis methods in oil-filled submarine cable, we chose domestic dodecylbenzene (DDB) insulating oil as research object. First, the decomposition temperature of DDB insulating oil was determined by thermogravimetric test under different heating rates. Subsequently, a test system was built to carry out thermal fault simulation tests of DDB pure oil, oil-paper, and 25# mineral oil at 150, 250, and 350℃. After test, the percentage of five characteristic gases (H2, CH4, C2H6, C2H4, C2H2) dissolved in the fault oils was measured to study the gas production law of DDB insulating oil under thermal fault. Finally, existing DGA diagnostic methods (classic Duval triangle, quadrilateral graphic method) were selected to analyze the gas data. The results show that the proportion of C2H4 dissolved in DDB insulating oil under thermal fault increase significantly with the increase of fault temperature, and the proportion of C2H4 in mineral oil is at a low level in the whole temperature range. In the thermal fault diagnosis, the classic Duval triangle and quadrilateral graphical method can detect thermal faults by the dissolved gas in DDB insulating oil, but the temperature range of thermal fault cannot be determined accurately, and the fault boundary need to be further modified.

dissolved gas analysis  /  dodecylbenzene  /  thermogravimetric analysis  /  thermal fault
Jianping LIAO, Jinwei CHU, Fan GAO, Yufei CHEN, Xingwei LIU, Chen ZHANG, Huaqiang LI, Lisheng ZHONG. Pyrolysis Gas Production Law of Dodecylbenzene and Fault Diagnosis of Oil-filled Cable Based on DGA[J]. Insulating Materials, 2021 , 54 (8) : 109 -114 . DOI: 10.16790/j.cnki.1009-9239.im.2021.08.017
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Year 2021 volume 54 Issue 8
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2021.08.017
  • Receive Date：2020-09-19
  • Online Date：2026-03-20
  • Published：2021-08-20
Article Data
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History
  • Received：2020-09-19
  • Revised：2020-11-03
Funding
Affiliations
    1Maintenance and Test Center of EHV Transmission Company of China Southern Power Grid Co., Ltd., Guangzhou 510405, China
    2State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2021.08.017
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表12种不同金属材料的力学参数
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Family		 属数
Number of
genus		 种数
Number of
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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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