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Breakdown strength is an essential feature of dielectrics. Theoretically, the intrinsic strength is independent of the configuration of the dielectrics or electrodes and the category of applied electric fields. However, the measured breakdown strengths of a same material under direct high voltage (HVDC) and alternative high voltage (HVAC) are significantly different. This paper aims to give an explanation...
The effect of space charge on dielectric performances is generally neglected under high voltage alternate current (HVAC) electric fields, due to the limited charge amount accumulated. This paper intends to expound the characteristics of space charge in polymeric under AC stresses and its importance to the breakdown strength of polyethylene. A numerical model based on space charge dynamics under high...
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