Effect of Surface Charge on the Surface Discharge Evolution for Polyimide under High Frequency Voltage
Lu Yangfei1, Li Qingmin1, Liu Tao1, Huang Xuwei1, Wang Zhongdong2
1. Beijing Key Laboratory of High Voltage and EMC North China Electric Power University Beijing 102206 China; 2. School of Electrical and Electronic Engineering The University of Manchester Manchester M139PL UK
Abstract：In order to investigate the influence of surface charge accumulation on surface discharge evolution process under high frequency sinusoidal voltage, surface discharge testing platform and surface charge measurement system was established respectively. Firstly, based on the needle-rod type electrode testing platform, the evolution process of surface discharge patterns and parameters were studied by experiments with testing frequency of 20 kHz and 30 kHz. Furthermore, by measuring the surface charge at different evolution stages, the spatial and temporal distributions of surface charge were summarized. Finally, the surface morphology and chemical structure of polyimide (PI) were tested by means of scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The experiment results show that the surface discharge has polarity effect, as the discharge amplitude in positive half wave is larger than that in negative half wave. Besides, discharges with high amplitude around the phase of positive peak occurred at middle stage, and the discharge times increased obviously at later stage. The physicochemical defects caused by surface discharge increased during the evolution process, leading to the constant accumulation of negative charges on PI surface. The electric field distortion near needle electrode resulted from surface charge is the main cause of the polarity effect. In contrast with high frequency voltage, negative surface charges accumulated on PI surface is less under power frequency voltage, leading to different polarity effect.
鲁杨飞, 李庆民, 刘涛, 黄旭炜, 王忠东. 高频电压下表面电荷分布对沿面放电发展过程的影响[J]. 电工技术学报, 2018, 33(13): 3059-3070.
Lu Yangfei, Li Qingmin, Liu Tao, Huang Xuwei, Wang Zhongdong. Effect of Surface Charge on the Surface Discharge Evolution for Polyimide under High Frequency Voltage. Transactions of China Electrotechnical Society, 2018, 33(13): 3059-3070.
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2018, Vol. 33 
