Electrochromic and Dielectric Characteristics of Advanced Insulating Polymer under Various Electric Fields

doi:10.11930/j.issn.1004-9649.202106016

Abstract

Abstract: In order to identify the charged states of power equipment through electrochromism of insulating materials, a regular/irregular poly(3-hexylthiophene) (reg-P3HT/irreg-P3HT) blend film is prepared. The experiment study shows that the reg-P3HT is evenly distributed as nano-scale crystallite morphology on top of the blend film. As the content of irreg-P3HT increases, the blend film shows better insulating performance in the direction of film thickness. When the content of irreg-P3HT reaches 95%, the blend film has a power frequency dielectric constant of 5.86, a volume resistivity of 3.2×10¹² Ω·cm, and a DC breakdown strength of 113 kV/mm. By applying charge accumulation spectroscopy, it is found that when the field strength reaches over 40 kV/mm, the space charges mainly accumulate in irreg-P3HT, and the blend film’s absorption intensity increases with the field strength at 450 nm, triggering the electrochromism of the insulating film. This work provides a new path for testing the charged states of insulating materials of power equipment.

Key words: high voltage, electrochromism, space charge, insulation, poly(3-hexylthiophene)

NIE Yongjie, JING Yu, ZHANG Meng, CHEN Haopeng, ZHAO Xianping, ZHAO Tengfei, XIANG Enxin, WANG Ke, LU Guanghao, ZHU Yuanwei. Electrochromic and Dielectric Characteristics of Advanced Insulating Polymer under Various Electric Fields[J]. Electric Power, 2021, 54(11): 144-152.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202106016

https://www.electricpower.com.cn/EN/Y2021/V54/I11/144

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