OLPD Testing

Periodic OLPD Spot Testing Service

Perioduic On‑line partial discharge (OLPD) testing provides an in‑service condition assessment of the insulation of cables and plant rated at 3.3 kV and above. It is performed using the HVPD Kronos® Spot Tester with sensors attached to the cable's earth connections in the switchgear, rotating machine or transformer cable box.


  • Indicates insulation degradation in advance of the failure
  • Detects and locates PD activity in the plant's insulation
  • Evaluates the plant under normal and abnormal working conditions
  • Can be performed with minimal disruption to operations 
  • Supports condition‑based maintenance of MV and HV networks