Author(s): SUN Changhai, LI Weijiang, WANG Ming, CHEN Baitong, WU Yan, ZHONG Juntao, XUE Jingmei, PENG Na, WEN Zheng, School of Electrical Engineering, Dalian University of Technology, Shenyang Transformer Corporation of TBEA
Pages: 366-371
Year: 2016 Issue:  S1
Journal: Journal of Chemical Industry and Engineering(China)
Keyword:  degree of polymerization; frequency domain dielectric spectroscopy; oil-paper insulation; insulation condition assessment;
Abstract: The paper is to study the relationship between degree of polymerization(DP)of oil-paper and frequency domain dielectric spectroscopy(FDS)in the insulation assessment of oil-paper condenser bushings.To achieve the result,a sample of oil-paper condenser bushings was designed and tested in aging.Through the measurement of DP and FDS of different aged samples and the study of relationship between DP and frequency domain curve of capacitance(C)and dielectric loss factor(tanδ),a new method of insulation assessment of oil-paper condenser bushings was invented.The results show that:(1)the capacitance frequency domain dielectric characteristic quantity of the oil-paper insulation sample in 10-3—1Hz can reflect the aging status of bushing;(2)There is a secondary polynomial function between DP and frequency domain curve of C;(3)The dielectric loss factor reflects the aging status of bushing only in the 1Hz.