电容器用介质薄膜多物理场下电导测量实验平台

Experimental Platform for Conduction Measurement in Multi-physical Field of Dielectric Films Used in Capacitors

金属化膜电容器具有更高的工作电压和储能密度,现阶段广泛应用于新能源电力系统中。然而这些应用场景对金属化膜电容器在复杂环境下的性能提出了更高的要求。其中介质薄膜作为核心元件,其电学性能直接关系到电容器的耐压程度和储能密度等重要参数,现有测量标准仅对室温下的介质薄膜进行电导测量,缺乏复杂环境对介质薄膜影响的测量方法。本文针对换流阀中电容器的应用场景,搭建多物理场下介质薄膜电导测量实验平台,模拟并扩大工况的环境范围,对介质薄膜施加电、热、力环境并准确测量泄漏电流。研究结果可以为介质薄膜改性提供指导方向。

Metallized film capacitor has higher operating voltage and energy storage density and,at pres-ent,is used widely in renewable energy power systems.However,these application scenarios pose higher requirements for the performance of metallized film capacitor in complex environment.As the core element,the electrical performance of dielectric film is directly related to such important parameters as the with-stand voltage level and energy storage density of capacitor.The existing measurement standards only mea-sure the conductivity of dielectric film at room temperature,lacking measurement methods for the impact on dielectric film in complex environments.As for the application scenario of capacitor in converter valves in this paper,an experimental platform for measuring the conductivity of dielectric film in multiple physical fields is set up,the environmental range of working conditions is simulated and expanded,electrical,ther-mal and mechanical environments are applied on the dielectric film and the leakage current is measured accurately.The research results can provide guidance for the modification of dielectric film performance.