Research Progress of Corona Resistant Polyimide Films
Zhang Yiyi1, Zhao Ziwei1, Liu Jiefeng1, Zha Junwei2,3
1. Guangxi Power Transmission and Distribution Network Lightning Protection Engineering Technology Research Center Guangxi University Nanning 530004 China; 2. School of Chemistry and Biological Engineering University of Science and Technology Beijing Beijing 100083 China; 3. Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing Beijing 100083 China
Abstract：With the development of power equipment in the direction of miniaturization and high frequency, the insulating medium in the power equipment needs to withstand higher frequency voltage levels. Polyimide is widely used as inter-turn insulating material in variable frequency motors, high-frequency transformers and wind power generation due to its excellent insulating properties, thermal stability and chemical resistance. However, due to its lack of corona resistance, the service life in high frequency environment is greatly shortened. Therefore, studying the corona aging mechanism of polyimide and the effect mechanism of material parameters on corona resistance is beneficial to the development of polyimide with higher corona resistance. First, in this paper, starting from the corona aging mechanism, the polyimide corona aging model is illustrated graphically, and the aging process is summarized into three aspects: particle impact, high temperature ablation and corrosion of active products. The energy characteristics of charged particles and the microstructure changes of polyimide are reviewed, and two corona aging models are introduced from the perspective of charge transport and energy conversion. The results show that: (1) The particles generated by corona discharge have great energy and can quickly destroy the molecular structure of polyimide, and the imide ring, ether bond and benzene ring change most obviously after corona aging. (2) The nanoparticles in the matrix can effectively weaken the energy of charged particles, reduce the damage of corona discharge to the polymer, and improve the corona resistance of the material. Secondly, the research progress of corona-resistant polyimide in recent years is analyzed from five aspects: dielectric properties, electrical conductivity properties, trap properties, interface properties and thermal conductivity. The following conclusions can be drawn: (1) The increase of the dielectric constant can improve the charge injection barrier, reduce the risk of charge injection and charge accumulation, and effectively improve the corona resistance performance, but an excessively large dielectric constant will also increase the dielectric loss and Adverse effects such as decreased dielectric strength; (2) The electrical conductivity can effectively change the partial discharge characteristics. Increasing the surface electrical conductivity of the film can improve the corona initiation discharge voltage under the AC electric field and reduce the possibility of local electric field distortion; (3) The introduction of nanoparticles can change the trap characteristics of the dielectric and affect the process of charge transport to improve the corona resistance. Shallow traps can speed up the rate of charge transfer and reduce the possibility of electric field distortion. Deep traps can reduce the frequent de-trapping-trapping process of charges and reduce the mechanical damage to the molecular chain. Therefore, it is very important to control the distribution of deep and shallow traps reasonably to improve the corona resistance performance; (4) The interface formed between the nanoparticles and the matrix can block the development of the corona discharge path, and finally form a "Z" discharge path, which prolongs the corona breakdown time in disguise; (5) Improves the thermal conductivity of the material , can reduce the thermal aging effect of the heat generated by the corona discharge on the polymer, reduce the risk of thermal breakdown, and improve the corona resistance life during normal operation. Finally, in view of the complex working conditions and insufficient production capacity of the current corona-resistant polyimide, the authors put forward his own suggestions from the aspects of mechanism research, production preparation and aging evaluation, aiming to realize the polyimide with high corona resistance performance.
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2023, Vol. 38 
