工频叠加谐波电压下温度对全膜电容器绝缘介质击穿特性的影响  

Influence of Temperature on the Dielectric Breakdown Characteristics of Foil-film Capacitor Under AC Superimposed Harmonic Voltage

作　　者：方田 李化[1] 黄想 国江 朱庆东 齐亮 林福昌[1] FANG Tian;LI Hua;HUANG Xiang;GUO Jiang;ZHU Qingdong;QI Liang;LIN Fuchang(Huazhong University of Science and Technology,Wuhan 430074,China;Wuhan Branch of China Electric Power Research Institute Co.,Ltd.,Wuhan 430070,China;State Grid Shandong Electric Power Research Institute,Jinan 250003,China)

机构地区：[1]华中科技大学,武汉430074 [2]中国电力科学研究院有限公司武汉分院,武汉430070 [3]国网山东省电力公司电力科学研究院,济南250003

出　　处：《高压电器》2022年第9期142-148,共7页High Voltage Apparatus

基　　金：国家电网有限公司总部科技项目(5200-201955076A-0-0-00)。

摘　　要：随着非线性用电设备在工业领域的大量应用,电网中的谐波含量日渐增多,对应用于系统中的全膜电容器带来很大的危害。为了研究工频叠加谐波电压下温度对全膜电容器绝缘介质击穿特性的影响,文中以全膜电容器元件为对象,在40、55、70、85℃下分别对全膜电容器元件在工频电压、工频叠加3次谐波电压、工频叠加5次谐波电压下进行了短时击穿试验,得到了工频叠加谐波电压下温度对全膜电容器绝缘介质击穿特性的影响规律。试验结果表明,在相同电压类型下,全膜电容器绝缘介质的击穿场强随着温度的升高而下降。且在40~85℃的范围内,全膜电容器元件在同一温度下的特征击穿场强随着谐波次数的增大而降低。With the increasing application of nonlinear electrical equipment in the industrial field,the harmonic con-tent in the power grid is gradually increasing,which brings great harm to the foil-film capacitors which is used in the system.For studying the influence of temperature on the dielectric breakdown characteristics of foil-film capacitors under AC superimposed harmonic voltages,the foil-film capacitor components are taken as the object in this paper,the short-term breakdown test under AC voltage,AC superimposed 3rd harmonic voltage,AC superimposed 5th har-monic voltage at 40,55,70,85℃are performed,respectively.The influence of temperature on the dielectric break-down characteristic of foil film capacitor under AC superimposed harmonic voltage is obtained.The test result shows that under the same type of voltage,the breakdown field strength of dielectric of the foil-film capacitors decreases with the increase of temperature.Moreover,in the range of 40~85℃,the characteristic breakdown field strength of the foil-film capacitors decreases with the increase of the number of harmonics at the same temperature.

关 键 词：谐波含量 全膜电容器 绝缘介质 击穿特性 温度 

分 类 号：TM53[电气工程—电器]