Relationship Between Electron Activation Energy Absorption and Impulse Breakdown Voltage in Polymers
Impulse breakdown is a common phenomenon in power equipment and electronic devices. To reveal impulse breakdown mechanism, a novel model of activation energy absorption for trapped electrons is proposed based on the mechanical vibration theory, considering the effect of trapped charges de-trapping process on electrical breakdown. In the model, the frequency-dependent dielectric properties, the frequency dependent absorption characteristic and the frequency spectrum of the impulse voltage are considered. To verify its reliability, the breakdown characteristics of polyethylene terephthalate film (PET) under impulse voltages are tested. In the experiment, the influences of different wave front/tail time and oscillation frequency on breakdown voltages are obtained. The mechanism analysis of breakdown phenomenon based on the proposed model is consistent with the experimental results. It is indicated that the proposed model is suitable for explaining the phenomenon of breakdown dispersion and the breakdown voltage varies with waveform parameters. This work provides a reference for the optimal design of insulation materials with enhanced impulse breakdown voltage.
KeywordsImpulse breakdown Activation energy absorption Dispersion Waveform parameters
This work was financially supported by the National Basic Research Program of China (973 Program) (2015CB251003), the China Scholarship Council (CSC) Fund, the National Key Basic Research Program of China (2017YFB0902702), the State Key Program of National Natural Science of China (51837002). We are grateful for their support.
- 2.Yin, K., Zhou, Z., Schuele, D.E., Wolak, M., Zhu, L.: Effects of Interphase modification and biaxial orientation on dielectric properties of poly (ethylene terephthalate)/poly (vinylidene fluoride-co-hexafluoropropylene) multilayer films. ACS Appl. Mater. Interfaces 8(21), 13555 (2016)CrossRefGoogle Scholar
- 7.Nagata, T., Shimizu, N.: Deterioration in aged XLPE cables. In: IEEE Conference on Electrical Insulation and Dielectric Phenomena CEIDP: 579 (1992)Google Scholar
- 9.Blaise, G.J.: The space charge physics and the breakdown process. Appl. Phys. Lett. 77(7), 2916–2927 (1995)Google Scholar