摘要
Partial discharge (PD) under a sequence of high-repetition-rate square pulses is one of the key factors leading to premature failure of insulation systems of inverter-fed motors. Polyimide (PI) film is an important type of insulating material used in the inverter-fed motors. In this paper, micro-morphology and structure change of PI film aged by bipolar continuous square impulse voltage (BCSIV) with ampli- tude above partial discharge inception voltage (PDIV) are investigated by scanning electron microscope (SEM). The chemical bonds of PI chain are analyzed through Fourier transform infrared spectroscopy (FTIR). The results show that the degradation mechanism of PI film is the fracturing of chemical bonds caused by the erosion from PDs. Three layers are displayed in both 100 HN film and 100 CR film. The de- gradation path of PI film is initiated from surface and then gradually extends to the interior with continuous aging. Nano-fillers can retard the degradation of PI film and prolong its lifetime.
Partial discharge （PD） under a sequence of high-repetition-rate square pulses is one of the key factors leading to premature failure of insulation systems of inverter-fed motors. Polyimide （PI） film is an important type of insulating material used in the inverter-fed motors. In this paper, micro-morphology and structure change of PI film aged by bipolar continuous square impulse voltage （BCSIV） with ampli- tude above partial discharge inception voltage （PDIV） are investigated by scanning electron microscope （SEM）. The chemical bonds of PI chain are analyzed through Fourier transform infrared spectroscopy （FTIR）. The results show that the degradation mechanism of PI film is the fracturing of chemical bonds caused by the erosion from PDs. Three layers are displayed in both 100 HN film and 100 CR film. The de- gradation path of PI film is initiated from surface and then gradually extends to the interior with continuous aging. Nano-fillers can retard the degradation of PI film and prolong its lifetime,
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2013年第8期1925-1931,共7页
High Voltage Engineering
基金
Project supported by National Natural Science Foundation of China （51177136）.
关键词
聚酰亚胺薄膜
脉冲电压
降解机理
方形
傅里叶变换红外光谱
扫描电子显微镜
局部放电
PI膜
inverter-fed motor
polyimide film
bipolar continuous square impulse voltage
partial discharge
aging
insulation failure
mi-cro-morphology
degradation mechanism
