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Identification of different partial discharge (PD) sources may be improved by the use of non-sinusoidal waveforms of the testing voltages. For instance, surface discharge (SD) and cavity discharge (CD) are not always easy to directly distinguish from the phase resolved PD pattern at traditional 50 or 60 Hz alternating sinusoidal voltage. This study compares PD patterns stimulated by sinusoidal voltage...
Surface discharge (SD), as one important partial discharge (PD) source, were measured in the test cell representing the surface discharge, with polycarbonate plate as the insulating material covered completely on the bottom ground electrode. This study compares PD patterns stimulated by sinusoidal voltage and by several forms of trapezoid-wave voltage, including the limiting cases of triangular and...
Partial Discharge (PD) tests are carried out in a needle-plane gap where the plane is covered by an insulating material. The partial discharge activity is studied during application of a periodic negative step voltage, whose duration of the voltage period T1 and the pause time T2 between every two consecutive step voltage pulses could be varied separately to influence the decay of deposited surface...
In this paper surface discharge along the oil-pressboard interface was investigated. Surface discharges were measured both in time domain by means of an oscilloscope and as phase resolve patterns. The effect of temperature from 20 °C to 90 °C on surface discharge inception, extinction and surface flashover voltage were investigated. Trend of number and maximum magnitude of PD was compared for 20 °C...
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