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An online Partial Discharge (PD) measurement performed on a High Voltage Direct Current (HVDC) wall bushing successfully identified the presence of internal discharges. The wall bushing is a sulfur hexafluoride gas-insulated bushing, rated for 500kVdc and terminated on a thyristor controlled HVDC converter bridge. The measurement of PD within the HVDC station environment is particularly challenging...
Partial Discharge (PD) pulses occurring in power transformers are influenced by distortion when the pulses propagate through the transformer, away from the site of the discharge activity. Attenuation and dispersion of PD pulse waveforms are potentially significant for some modern on-line partial discharge measurement instruments. These modern instruments use fast sampling digital oscilloscopes to...
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