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


traps distribution

HVDC composite insulator


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)

Vol. 26 3 843-850 8726032

Subject Categories

Other Engineering and Technologies not elsewhere specified

Other Materials Engineering

Electrical Engineering, Electronic Engineering, Information Engineering



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