Relevance Analysis between Decomposition Product Characteristics of C6F12O Gas Mixture under Partial Discharge and Insulation Faults

• Published in: IEEE transactions on dielectrics and electrical insulation 2024-12, Vol.31 (6), p.1-1
• Main Authors: Luo, Wenxuan, Wang, Jiahao, Wu, Yingyu, Rao, Xiajin, Gao, Shen, Tian, Shuangshuang
• Format: Article
• Language: English
• Subjects: C<sub xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">6 F<sub xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">12 O Gas Mixture; Carbon dioxide; Decomposition; Decomposition Product Characteristics; Defects; Discharge; Discharges (electric); Electrodes; Fault detection; Fault diagnosis; Faults; Gas chromatography; Gas mixtures; Gases; Identification of insulation defects; Insulation; Judgment of PD strength; Low voltage; Metals; Partial Discharge; Partial discharges
• ISSN: 1070-9878; 1558-4135
• DOI: 10.1109/TDEI.2024.3379958

C 6 F 12 O/CO 2 gas mixture possesses the potential for application in medium to low voltage equipment. However, during equipment operation, insulation defects caused by various factors can result in partial discharge (PD), causing the C 6 F 12 O/CO 2 gas mixture to decompose. Therefore, the study of the properties of decomposition products under partial discharge of C 6 F 12 O/CO 2 gas mixture is of great significance for the identification of insulation faults. Four typical insulation defects are selected and PD decomposition experiments are carried out under different voltages for different defects of C 6 F 12 O/CO 2 gas mixture. Using gas chromatography, decomposition products such as CF 4 , C 2 F 6 , C 3 F 8 , and C 3 F 7 H are detected and the changing patterns of four typical decomposition products under different insulation defects are determined. The concentration ratios of C 2 F 6 /C 3 F 8 and CF 4 /C 3 F 7 H are plotted as two-dimensional coordinates X and Y, respectively, and the distribution of product concentration ratios under different defects is shown. A coding tree for identifying types of insulation defects has been constructed. Additionally, combining (CF 4 +C 2 F 6 +C 3 F 8 )/C 3 F 7 H and CF 4 /C 3 F 7 H with the decomposition product rate allows for a comprehensive assessment of the PD strength. This study provides effective means for diagnosing insulation faults in C 6 F 12 O/CO 2 gas mixture insulation equipment.