How to Test Your Facility for Partial Discharge

Learn what Partial Discharge is and how you can effectively test for it to prevent high and medium voltage equipment failure.

What is Partial Discharge?

Partial Discharge (PD) is a spark bridging the gap between two electrodes. It normally occurs within a very small portion of the insulation between the electrodes, happening due to inequality between the electric field strength and the insulation breakdown strength.

When PD occurs, it is a sign of deterioration that will eventually lead to failure. Some failures lead to considerable damage and far-reaching outages. This is why it is vital that you test for PD intermittently.

How do I test for Partial Discharge?

Testing for PD includes these two forms of tech:

  1. TEV detection– This is used to detect internal discharge and relies on the voltage pulse to effectively detect PD.
  2. Ultrasound detection – This detects surface PD and is more widely used than TEV. This form of PD detection relies on sound emissions resulting from a PD.

Learn more about PD testing by watching these helpful videos.

It is generally best to find a PD testing service that will not require the total shutdown of your facility. Hiring a PD testing service will give you the details you need to make repairs and schedule proper maintenance.