The Engineer in this video is undertaking non-intrusive detection of partial discharge activity on high voltage (HV) electrical equipment using our UltraTEV pickup probe.
The UltraTEV is intended to quickly detect the presence of discharge activity and give an indication if further investigation is needed through detection of both ultra-sonic and electromagnetic activity.
When partial discharge occurs it can either be detected by ultra sound sensing or by placing the instrument on the switchgear to detect transient earth voltages within the outer metal cladding of the switchgear. Partial discharges are electric charges that do not completely bridge the phase electrodes.
The magnitude of such discharges is usually small, however, they do cause progressive deterioration of insulation that may lead to eventual failure within the switchgear. The red light indicator lighting up on the UltraTEV in the video is proving the presence of partial discharge within the HV equipment.