Simulation of partial discharges under influence of impulse voltage

Abstract

Проведено схемотехнічне моделювання іонізаційного пробою твердого діелектрика з частковим розрядом у газовому включенні. Запропоновано декілька способів схемотехнічного моделювання пробою газового включення при частковому розряді. Встановлено, що при впливі повного грозового імпульсу напруги на діелектрик в газовому включенні виникають інтенсивні часткові розряди, як на фронті імпульсу, так і на його спаді.

Effect of voltage harmonics on pulse repetition rate of partial discharges

“…1. This model was proposed in article [3]. Mode ling was performed in the Micro-Cap Evaluation/Student Version [11].…”

“…The reason for this is that the total harmonic distortion (1) does not take into account the phase angles of the individual voltage harmonic components [2]. In [3] two examples of the dependence of the number of partial discharge pulses on the phase angle of the 5th order voltage harmonic are shown. In the first case, in gas cavity, the same number of partial discharges occurs during a period, as with a pure sinusoidal voltage, but in the second case, the number of partial discharges is greater.…”

“…The study was carried out at several fixed values of the phase angle of higher-order harmo nics. An example of the combined effect of the 1st and 5th order voltage harmonics on the change in the number of partial discharges over a period is shown in article [3]. At the same time, the percentage of the 5th order voltage harmonic component (4 %) does not exceed the permissible value specified in GOST 13109.…”

“…In this paper, the authors propose to carry out a wider research by increasing the number of voltage harmonics taken into account together with the fundamental frequency harmonic from the 2nd to the 30th order. In this research, it is possible to use the same model of a dielectric with a gas cavity as in article [3], making appropriate changes to the voltage source.…”

“…The internal resistance of the voltage source is 1 Ω . It is assumed in the article that C 1 5000 = pF; C 2 200 = pF and C 3 600 = pF[3]. Gas cavity characteristics are following: value of the partial discharge inception voltage is +800 V, and the partial discharge extinction voltage is +400 V. Analogously for a negative half-cycle of a sinusoidal voltage, these values are -800 V and -400 V. It is assumed in the article that the amplitude of the fundamental frequency voltage harmonic is U…”