Dry DC metallized film capacitor exhibits special"self-healing"properties,allowing the elimina-tion 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 metal-lized film under the AC/DC superposition is studied,and the mechanism of different AC/DC composite volt-age to the self-healing properties of metallized film is analyzed under the action of such stresses as tempera-ture and pressure.At the same time,based on observed phenomena and derived conclusions from tempera-ture 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).
关键词
自愈特性/原位测量/交直流/热力学模型
Key words
self-healing/in-situ testing/combined AC/DC/thermodynamic model
维普
万方数据