High Voltage Services

Partial Discharge

RANS Electrical provides partial discharge testing capable of performing a wide range of PD measurement tasks in a variety of environments on and offline. We also provide fixed PD monitoring for all applications.

We offer testing for

  • Rotating machines
  • Power transformers
  • Current and Voltage transformers in switch gear
  • Gas insulated switchgear (GIS)
  • Power cables

What is partial discharge?

Partial discharge (PD) is a localised dielectric breakdown of a small portion of a solid or fluid electrical insulation system under High Voltage stress, which does not bridge the space between two conductors. Partial discharges within solid insulation system are not visible.

PD can occur in a gaseous, liquid or solid insulating medium. It often starts within gas voids, such as voids in solid epoxy insulation or bubbles in transformer oil. Protracted partial discharge can erode solid insulation and eventually lead to breakdown of insulation.

For your next project, talk to the professionals.