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PD Testing of Rotating High Voltage Machines (Motors and Generators)

HVPD utilise the HVPD-Longshot™ PD Test System to carry out both On-Line (in-service testing) and Off-line (factory testing) Partial Discharge (PD) Testing of Rotating High Voltage Machine Insulation. On-line PD testing is now widely accepted in the rotating HV machine industry as the best way to assess the condition of in-service HV motors and generators. To meet this market demand, the HVPD-Longshot™ system and PDGold© software includes a dedicated 'Machines Software Module' which has been specifically designed for the PD Testing of HV motors and generators. The technology provides the user with the ability to carry out PD testing of HV machine insulation quickly and easily without the need for an outage.

PD measurements can be made On-Line using split-core, High Frequency Current Transformers sensors around the supply cable.
PD measurements in pico-Coulombs (pC’s).
PD activity is presented in simple colour codes based on the PD severity (PD magnitude x no. of pulses per power cycle).
Automatic diagnostic of whether the discharge is in the Slot Section or the End Windings.

On-line PD Testing of a Large Generator – Customer: BP, Algeria

On-line PD Testing of HV Machines in Cruise Ships – Customer V.Ships, Monaco

Off-line PD Testing of HV Motors in the Motor Re-wind Factory

For further detailed information, visit our Applications Notes page.