Space charge behavior in silicone rubber from in-service aged HVDC composite insulators
Journal article, 2019
Space charge behavior in sheds removed from service aged 500 and 800 kV HVDC silicone rubber insulators and compared to a stored reference insulator is reported in this paper. The aim of this investigation is to evaluate the material aging. The investigations are made under electric field of ±20 kV/mm at room temperature using pulsed electro-acoustic technique. Based on the results, the electric field distribution and mobility of charge carriers, considering the contributions of de-trapping process from both shallow and deep traps, are deduced. It is concluded that space charge concentration in the aged material increases compared to that in the reference material and the dynamics of the charge decay changes. The understanding of this behavior provides a means of possibility assessing insulator material aging.
space charge
charge transportation
ageing
traps distribution
HVDC composite insulator
Author
Chao Yuan
South China University of Technology
Tsinghua University
congzhen xie
South China University of Technology
Licheng Li
South China University of Technology
Xiangdong Xu
Chalmers, Electrical Engineering, Electric Power Engineering
Stanislaw Gubanski
Chalmers, Electrical Engineering, Electric Power Engineering
Yao Zhou
Tsinghua University
Qi Li
Tsinghua University
Jinliang He
Tsinghua University
IEEE Transactions on Dielectrics and Electrical Insulation
1070-9878 (ISSN) 15584135 (eISSN)
Vol. 26 3 843-850 8726032Subject Categories
Other Engineering and Technologies not elsewhere specified
Other Materials Engineering
Electrical Engineering, Electronic Engineering, Information Engineering
DOI
10.1109/TDEI.2018.007870