Influence of Repetitive Impulse Waveforms on Surface Discharge Characteristics and Insulation Life for Polyimide Film  

作　　者：Zhiyun Han Qingmin Li Yujin Guo Tao Liu Guojing Dong Hanwen Ren 

机构地区：[1]State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China [2]Electric Power Research Institute,Beijing 100085,China [3]Inner Mongolia Electric Economy and Technology Academy,Hohhot 010020,China

出　　处：《CSEE Journal of Power and Energy Systems》2024年第2期746-755,共10页中国电机工程学会电力与能源系统学报（英文）

基　　金：supported by the National Natural Science Foundation of China(51929701,52207153);Fundamental Research Funds for the Central Universities(2023JC005).

摘　　要：Accelerated insulation aging problems under high frequency repetitive impulses in power electronic transformers are drawing more and more attention in modern power systems. Partial discharge (PD) characteristics including discharge inception voltage, phase distribution and statistical characteristics on polyimide (PI) surface under different impulse waveforms and the insulation life of PI films are studied in this paper. We carry out experiments based on PD and insulation lifetime test systems, using five different types of repetitive impulses, including three bipolar waves and two unipolar waves. The experimental results show that there is little variation in discharge inception voltage under different waveforms, but great variation in phase distribution and statistical characteristics of PD. In addition, insulation life is approximately the same under different waveforms with the same polarity, and the aging rate under bipolar waveforms is larger than that under unipolar waveforms. We explain the differences between the bipolar and unipolar waveforms on insulation life, which can be concluded that the surface charge under unipolar waveform accumulates more significnatly compared with bipolar waveform and decreases the electric filed strength in discharging the air gap and inhibits surface discharge from occurring.

关 键 词：Insulation life polyimide film power electronic transformer repetitive impulse surface discharge characteristics 

分 类 号：TM21[一般工业技术—材料科学与工程]