A model for dielectrics experiencing partial discharges under high electric fields

This work is in the research field of partial discharges to electrical insulating materials. A theoretical model is proposed that simulates the partial dischargeʹs development within a metal (solid insulating material) metal structure. A nonlinear, time-dependent resistance using a new formula simulates the activity of partial discharges in dielectrics and the suggested equivalent circuit is analysed. Comparison of the experimental results and the outcome of the model demonstrates satisfactory consistency. Slight deviations consist of a minor phase shift between the computed and measured waveforms, as well as small oscillations of the waveform measured in the vicinity of the potential steps. These deviations are attributed to a very small parasitic inductance, which is always present in the measuring circuit.