# The Quantitative Evaluation of Aging State of Field Composite Insulators Based on Trap Characteristics and Volume Resistivity-Temperature Characteristics

• Liang, Ying (Suqian Power Supply Branch, State Grid Jiangsu Electric Power Supply Co., Ltd) ;
• Gao, Li-Juan (Hengshui Power Supply Branch, State Grid Hebei Electric Power Supply Co., Ltd) ;
• Dong, Ping-Ping (Hengshui Power Supply Branch, State Grid Hebei Electric Power Supply Co., Ltd) ;
• Gao, Ting (Hengshui Power Supply Branch, State Grid Hebei Electric Power Supply Co., Ltd)
• Received : 2017.09.13
• Accepted : 2018.01.10
• Published : 2018.05.01

#### Abstract

In order to obtain a better understanding of the ageing process of the field composite insulators, it is necessary to explore a quantitative-valuation method for the aging state evaluation. And the linear relationship between volume resistivity and temperature is proposed. In this paper, the composite insulators with different lengths of operating lives from two manufacturers were tested. The relationship between trap characteristics and volume resistivity-temperature characteristics were analyzed based on Thermal Stimulated Current (TSC), volume resistivity-temperature test, Scanning Electron Microscope (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). Furthermore, the application of trap characteristics in the quantitative evaluation of aging state of composite insulators was discussed. The results showed that there was a general negative correlation between the relative variation ratio of trap charges and the volume resistivity-temperature characteristics. Meanwhile, the physicochemical properties would change with the aging time, which would result in the increasing of electron traps. Combined with the TSC and volume resistivity test results, the trap characteristic thresholds which indicated the serious age of the composite insulators had been proposed.

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