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Partial discharges proved to be important diagnostic parameter during technical lifetime of operated electrical machines. Until now PD phenomena was well described and understood in technical society, especially for characteristic arrangement, e.g. corona, tip to plane, sphere to plane, and others. Most of the studies were done under AC voltage. However as DC transmission is concerned, more attention...
The effect of dc prestress on positive streamer initiation and propagation was investigated at atmospheric conditions in a small liquid-filled point-plane gap, representing a model for the insulation in power electronic components. Shadowgraphic imaging and photomultipliers to record emitted light were used. The applied voltages were step voltages (100 ns rise time) with or without a dc bias. The...
Many papers have reported the experimental results of partial discharges in solid as well as liquid insulating materials. However, there is almost no report deals with the comparison between the two and particularly concerning the phase resolved partial discharges in solid and liquid insulation. This paper reports the comparison of phase-resolved partial discharge characteristics in solid and liquid...
An experimental study of pre-breakdown current in air-solid interface subjected to a 50-Hz AC voltage at atmospheric pressure is presented. The results show that the pre-breakdown current is in the form of pulses. We characterize these currents by the shape the pulses, their magnitude and the associated charge. The pre-breakdown current is strongly influenced by the applied voltage and the thickness...
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