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Insulation degradation affected by micron metal particles attached on epoxy surface: charge accumulation and flashover voltage.

Authors :
Yang, Zhuodong
Qi, Bo
Yang, Xiao
Gao, Chunjia
Zhang, Yi
Luo, Yuan
Sun, Caixin
Li, Chengrong
Source :
Journal of Physics D: Applied Physics; 10/12/2022, Vol. 55 Issue 42, p1-10, 10p
Publication Year :
2022

Abstract

The micron metal particles are inevitably produced in long-term operation condition of high voltage direct current SF<subscript>6</subscript> insulated apparatus, which could frequently cause the surface discharge. Degradation of long-term surface discharge will be a severe threat to the insulation strength. Aiming at this problem, the surface charge accumulation and flashover voltage of epoxy itself before and after discharge degradation by particles were compared in this paper. The composition after degradation was measured by EDS and FTIR. The microstructure was observed by SEM. The roughness was measured as well. The trap distribution was measured by SPD. The mechanism of degradation and its effect on insulation characteristics were analyzed. The results show that the surface charge accumulation increase three times after degradation. Additionally, flashover voltage decreases 19% after degradation. The smoothly surface after degradation decrease the trap energy level for 14%, which might be the change reason of surface charge accumulation and flashover voltage. This paper can offer as a reference for the effect of micron metal particles on insulation degradation in SF<subscript>6</subscript> gas insulated equipment. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00223727
Volume :
55
Issue :
42
Database :
Complementary Index
Journal :
Journal of Physics D: Applied Physics
Publication Type :
Academic Journal
Accession number :
158630754
Full Text :
https://doi.org/10.1088/1361-6463/ac8560