Surface Charge Dissipation Characteristics of Epoxy Resin Under Different Thermal Aging Conditions

doi:10.16183/j.cnki.jsjtu.2024.244

Abstract

Abstract:

Gas insulated switchgear (GIS) and gas insulated transmission line are widely applied in high-voltage power transmission systems. However, internal insulator flashover faults critically undermine their safe and stable operation. Surface charge has been confirmed as a key factor affecting the flashover voltage of insulating components, but changes in the accumulation and dissipation characteristics of surface charges on insulators after prolonged operational aging remain unclear. To address this problem, an apparatus for measuring surface charge is constructed to examine the dissipation of surface charges under different thermal aging conditions, and to explore the dissipation characteristics at different voltage magnitudes and polarities. The results indicate that thermal aging increases the glass transition temperature of the epoxy samples, thereby reducing the rate of surface charge dissipation. At identical voltage magnitudes, the accumulation of surface charges is greater with the application of negative polarity voltage compared to positive polarity. The dissipation of surface charges on the insulator surfaces approximately follows an exponential decay, with a time constant ranging from 10⁴ to 10⁵ s. The findings on surface charge dissipation of epoxy resin samples under different conditions provide a novel perspective for assessing the aging degree of insulating components and can serve as a reference for fault analysis and reduction in actual engineering applications.

Key words: surface charge, epoxy resin, thermal aging, gas insulated switchgear (GIS)

CLC Number:

TM855

SONG Zhaohui, LI Xin, LIU Min, CHEN Zehong, ZHANG Jingying, WANG Feng, CHEN She. Surface Charge Dissipation Characteristics of Epoxy Resin Under Different Thermal Aging Conditions[J]. Journal of Shanghai Jiao Tong University, 2026, 60(4): 674-681.

Figures/Tables 9

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时间/h	未老化总电荷量/μC	120 ℃老化10天总电荷量/μC	150 ℃老化10天总电荷量/μC	180 ℃老化10天总电荷量/μC
0	-1.090	-1.106	-1.099	-1.111
0.5	-1.066	-1.088	-1.078	-1.085
1	-1.053	-1.082	-1.070	-1.074
2	-1.033	-1.074	-1.058	-1.064
3	-1.016	-1.069	-1.050	-1.054
5	-1.000	-1.055	-1.040	-1.046
10	-0.973	-1.033	-1.014	-1.017
20	-0.939	-0.999	-0.989	-0.981

老化程度	时间常数,t₁/h	玻璃化转变温度/℃	体积电阻率/ (Ω·cm)
未老化	5.3116	97.16	1.43×10¹⁶
120 ℃老化10天	11.0563	112.19	2.74×10¹⁶
150 ℃老化10天	7.8565	113.10	2.88×10¹⁶
180 ℃老化10天	6.7953	114.90	2.86×10¹⁶

时间/h	电荷剩余比例/%
时间/h	未老化	180 ℃老化10天
0	100	100
10	83.00	85.51

t/h	电荷剩余比例/%
t/h	-10 kV 未老化	+10 kV 未老化	-10 kV 180 ℃ 10天	+10 kV 180 ℃ 10天
0	100.00	100.00	100.00	100.00
10	86.96	87.27	91.65	93.54