中国电机工程学报2017，Vol.37Issue(9)：2750-2758,9.DOI:10.13334/j.0258-8013.pcsee.160547
聚酰亚胺薄膜局部放电频致拐点现象及形成机制
Frequency-Induced Inflection Point Phenomenon and Formation Mechanism of Partial Discharge With Polyimide Films
摘要
Abstract
Partial discharge (PD) is one of the most important causes of insulation aging and failure in high frequency power transformers. In order to accurately evaluate the influences of frequency and temperature on PD characteristics of polyimide films under high frequency sinusoidal waveform, a PD test system with variable frequency and temperature was established. The phase spectrum, repetition rate and amplitude of PD pulses along with insulation life were investigated at different frequencies (0.5~40kHz) and temperatures (30~200℃). Experiment results indicate that with the rising of frequency, the average number and amplitude of PD pulses in a cycle increase first and decrease afterwards, showing an inflection point in the variation curves, and the inflection point will move gradually toward the low frequency direction when the temperature is higher; while the discharge number and amplitude increase monotonically with temperature rise. Based on the correlation between spaces charges and characteristic parameters of PD pulses, influence mechanism of temperature on PD properties, combined with frequency-induced thermal effect and the impact of frequency on space charge dissipation process, the mathematical model and formation mechanism of inflection point phenomenon are presented in this paper, which presents theoretical reference for elucidating the partial discharge mechanism under high frequency stresses.关键词
高频局部放电/拐点现象/频率/温度/空间电荷/聚酰亚胺Key words
high frequency partial discharge/inflection point phenomenon/frequency/temperature/space charge/polyimide分类
信息技术与安全科学引用本文复制引用
刘涛,李庆民,黄旭炜,韩帅,鲁杨飞,鲁旭,王忠东..聚酰亚胺薄膜局部放电频致拐点现象及形成机制[J].中国电机工程学报,2017,37(9):2750-2758,9.基金项目
国家自然科学基金项目(51477051,51628701) （51477051,51628701）
中央高校基本科研业务费专项资金(2016XS08). Project Supported by National Natural Science Foundation of China (51477051, 51628701) （2016XS08）
The Fundamental Research Funds for the Central Universities (2016XS08). （2016XS08）
