结晶度对金属化膜电容器保压性能的影响  

Voltage Maintaining Performance of Metallized Film Capacitors Based on Crystallinity Regulation

作　　者：王雨橙 李化 王哲豪 林福昌 WANG Yucheng;LI Hua;WANG Zhehao;LIN Fuchang(State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science&Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学电气与电子工程学院强电磁工程与新技术国家重点实验室,武汉430074

出　　处：《高电压技术》2022年第9期3643-3650,共8页High Voltage Engineering

基　　金：国家自然科学基金(51822704)。

摘　　要：电容器在充电至设定电压并与电源断开后,会出现电压降落的现象,造成放电效率的下降。以金属化聚丙烯薄膜电容器(metallized polypropylene film capacitor,MPPFC)为对象,研究了结晶度对电容器保压性能的影响。结合热刺激去极化电流法得到薄膜的陷阱参数,并搭建了MPPFC的保压性能试验平台,研究了不同结晶度薄膜电容器元件的保压性能。研究结果表明:随着结晶度的增加,聚丙烯薄膜电导率减小,同时松弛极化支路数减少,陷阱深度变浅,MPPFC的保压性能增强;较高结晶度的BOPP薄膜电导率小,对应介质泄漏少;同时结晶度的提高改变松弛极化过程,使电压降减小。适当提高电介质薄膜的结晶度有助于提高金属化膜电容器的保压性能。After a capacitor is charged to the set voltage and disconnected from the power supply, the voltage decay will occur, resulting in the decrease of discharge efficiency. Taking metallized polypropylene film capacitor(MPPFC) as the object,we studied the influence of crystallinity on the voltage maintaining performance of capacitors. The trap parameters were obtained by using thermally stimulated depolarization current method, and a voltage maintaining performance experiment platform of MPPFC was built to study the voltage maintaining performance of MPPFC with different crystallinity. The results show that, with the increase of crystallinity, the conductivity of polypropylene film decreases, the number of relaxation polarization branches decreases, the trap depth becomes shallower, and the voltage maintaining performance of MPPFC is enhanced. BOPP films with higher crystallinity have lower conductivity and less dielectric leakage. Moreover, the increase of crystallinity will change the relaxation polarization process and correspondingly the voltage decay will decrease. Appropriately increasing the crystallinity of the dielectric film can improve the voltage maintaining performance of metallized film capacitors.

关 键 词：金属化膜电容器 保压性能 结晶度 介质泄漏 松弛极化 

分 类 号：TM53[电气工程—电器]