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