【摘要】 干式直流金属化膜电容器由于其具有特殊的“自愈”特性，在投入使用前可通过“赋能”工艺去除电弱点，相比于箔式电容器，其工作电压更高，储能密度更大。为此，搭建了金属化膜自愈特性原位测试平台，研究了交直流叠加下金属化膜自愈特性的演变规律，分析了在温度、压强等复杂应力作用下，不同交直流复合电压对金属化膜自愈特性的作用机制。同时依据温度实验中发现的现象和得出的结论，搭建了自愈热力学模型，从热力学理论的角度上明确了焦耳热为自愈能量的主要来源，经过仿真计算后发现，热力学模型在0.1 MPa低压强下呈现很好的拟合效果，但在10 MPa高压强下误差较大。更多还原

【Abstract】 Dry DC metallized film capacitor exhibits special“self-healing”properties,allowing the elimination of electrical vulnerabilities through an“empowering”process prior to operation. Compared to foil capacitor,it offers higher operational voltages and greater energy storage density.For this purpose,the in-situ test platform of self-healing properties of metallized film is set up,the evolution of the self-healing of metallized film under the AC/DC superposition is studied,and the mechanism of different AC/DC composite voltage to the self-healing properties of metallized film is analyzed under the action of such stresses as temperature and pressure. At the same time,based on observed phenomena and derived conclusions from temperature experiments,a thermodynamic model for self-healing is set up. It is defined from the point of view of thermodynamic theory that the joule heating is the primary source of self-healing energy. It is found through simulation and calculation that the thermodynamic model exhibits very good fitting effect at low itensity of pressure(0.1 MPa),but shows notable error at high intensity of pressure(10 MPa).更多还原