title: Effects of aging on the structural, mechanical, and thermal properties of the silicone rubber current transformer insulation bushing for a 500 kV substation.
abstract: In order to analyze the cracking and aging reason of the silicone rubber current transformer (CT) insulation bushing used for 8 years from a 500 kV alternating current substation, characteristics including Fourier transform infrared (FTIR) spectroscopy, mechanical properties analysis, hardness, and thermo gravimetric analysis have been carried out. The FTIR results indicated that the external surface of the silicone rubber CT insulation bushing suffered from more serious aging than the internal part, fracture of side chain Si-C bond was much more than the backbone. Mechanical properties and thermal stability results illustrated that the main aging reasons were the breakage of side chain Si-C bond and the excessive cross-linking reaction of the backbone. This study can provide valuable basis for evaluating degradation mechanism and aging state of the silicone rubber insulation bushing in electric power field.
authors.affiliation: State Grid Sichuan Electric Power Research Institute, Chengdu, 610072 China.
authors.forename: Zhigao
authors.initials: Z
authors.lastname: Wang
authors.affiliation: State Grid Sichuan Electric Power Research Institute, Chengdu, 610072 China.
authors.forename: Xinghai
authors.initials: X
authors.lastname: Zhang
authors.affiliation: State Grid Sichuan Electric Power Research Institute, Chengdu, 610072 China.
authors.forename: Fangqiang
authors.initials: F
authors.lastname: Wang
authors.affiliation: State Grid Sichuan Electric Power Research Institute, Chengdu, 610072 China.
authors.forename: Xinsheng
authors.initials: X
authors.lastname: Lan
authors.affiliation: State Grid Sichuan Electric Power Research Institute, Chengdu, 610072 China.
authors.forename: Yiqian
authors.initials: Y
authors.lastname: Zhou
keywords: Aging analysis; Characterization; External insulation; Polymers; Silicone rubber