With the development of metalized film capacitors (MFCs), their applications have become more extensive, such as fields of voltage support, energy storage and power electronics. Increasingly more complex operation environments considering electrothermal stresses place more stringent requirements on the comprehensive performances of capacitors (Guido and Maurizio in IEEE Trans. Plasma 28:1603–1606, 2000;Kartal and “Review of film capacitor trends and design changes as a result of improved technologies in power electronics”, PCIM Europe, in Intelligent Motion, Renewable Energy and Energy Management, Nuremberg, Germany 2017:1–3, 2017;). MFCs are composed of overlapping polymer insulation and electrodes (Brown in IEEE Trans. Device Mat Reliab. 6:326–333, 2006). Based on such structures, polypropylene (PP) films as the dominant dielectric used in MFCs, play a significant role in the stable operation of capacitors in power systems (Barshaw in IEEE T. Magn. 43:223–225, 2007). It is a considerably major issue for PP films to possess superior electrical properties under long-term compound effects of high temperature and electric field.