Phase resolving partial discharge pattern acquisition and frequency spectrum analysis

The 'partial discharge pattern recording technique' is applicable to electrical insulation field measurements, particularly if combined with disturbance rejection and nonconventional pick-ups. Electromagnetic disturbances are eliminated by filtering in the time domain (impulse noise gating) and/or in the frequency domain (down-mixing). PD patterns not only help to identify the defect type but also serve to evaluate the efficiency of a disturbance rejection procedure.<>