摘要
金属化膜电容器是由两张错开一定距离的金属化薄膜卷绕而成,薄膜表面真空蒸镀一层厚度为纳米级的导电金属层作为电极。金属化膜电容器内部没有传统的油浸电容器以铝箔、浸渍剂作为导热介质,内部温度梯度较大。温度是影响金属化膜电容器运行稳定性和使用寿命的重要因素,因此有必要对电容器温升进行研究,并对其进行优化改进。本文分析了电容器的损耗特性、热传导过程,给出一种简化模型的解析计算式,提出了温升的计算方法,且对电极镀层结构和参数进行了优化改进。研究结果表明:用渐变方阻局部温升性能更优,采用较厚的金属化薄膜及增大半径高度比值有利于降低电容器的温升。
The metallized film capacitor is made of two spaced metallized films by way of winding.The surface of the metallized film is vacuum evaporated with a conductive metal layer of nanometer thickness as the electrode.Metallized film capacitor is different from traditional oil-immersed capacitor with aluminum foil and impregnating agent as heat conduction medium,so the internal temperature gradient is large.Temperature is an important factor affecting operation stability and service life of metallized film capacitor,so it is necessary to study,optimize and improve the temperature rise of the capacitor during operation.In this paper,the loss characteristics and heat conduction process of capacitor are analyzed.A kind of analytic formula is given,the calculation method of the temperature rise is proposed and the structure and parameters of electrode coating of capacitor are optimized and improved.The study results show that the temperature rise performance of the capacitor is better by using gradual square resistance,and the temperature rise of the capacitor is reduced by using thicker metallized film and increasing the radius to height ratio.
作者
王流火
姚成
胡泰山
刘浩
WANG Liuhuo;YAO Cheng;HU Taishan;LIU Hao(Guangdong Power Grid Co.,Ltd.,Guangzhou 510699,China;Electric Power Research Institute,CSG,Guangzhou 510663,China)
出处
《电力电容器与无功补偿》
2023年第6期67-72,共6页
Power Capacitor & Reactive Power Compensation
关键词
金属化膜电容器
损耗
温升计算
方阻
metallized film capacitor
loss
temperature rise calculation
square resistance
