Open AccessSF 6 positive DC partial discharge decomposition components under four typical insulation defects
Author(s) -
Cao Zhengqin,
Tang Ju,
Zeng Fuping,
Yao Qiang,
Miao Yulong
Publication year - 2019
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2018.5101
Subject(s) - partial discharge , sulfur hexafluoride , materials science , decomposition , nuclear engineering , voltage , electrical engineering , chemistry , engineering , organic chemistry
The condition monitoring and fault diagnosis method based on decomposed component analysis (DCA) for SF 6 gas‐insulated equipment, which mainly aiming at AC SF 6 gas‐insulated equipment, has become a research hotspot. Therefore, SF 6 positive DC partial discharge (PD) decomposition experiments under four typical insulation defects were conducted in this work. The result showed that there is a significant correlation between the generation rules of the five SF 6 decomposition components (CF 4 , CO 2 , SO 2 F 2 , SOF 2 and SO 2 ) and the types of defects. The phenomenon was attributed to the variations in the properties of the four insulation defects. In addition, comparing with AC PD experiment, for the protrusion, contamination and gap defect models, the amounts and generation rates of the five characteristic decomposition components under positive DC are less than those under AC by the same defect; however, for the particles defect, it is by contrary. This could be attributed to the essential difference between AC PD and positive DC PD. Therefore, the theory of AC DCA could provide reference to construct DCA diagnostic model for DC SF 6 gas‐insulated equipment, but cannot be applied mechanically.