Partial Discharge Activity

Levertech Engineering Services > Services > HV Services > Partial Discharge Activity

Partial discharges are electric discharges that do not completely bridge the electrodes. The magnitude of such discharges is usually small, however, they do cause progressive deterioration of insulation that may lead to eventual failure.


Non-intursive partial discharge detection provides a means for identifying these potential sources of insulation failure that result not only in loss of supply to customers but may lead to a disruptive failure which could lead to danger to staff.


The most practical techniques for non-intrusive testing are based on the detection of the radio frequency part of the electromagnetic spectrum and ultrasonic emissions.


The Ultra TEV Detector has been specifically developed to enable electromagnetic and ultrasonic activity to be detected in a single simple to use instrument.



Airborne Ultrasonic Detection

Acoustic emission from partial discharge occurs over the whole acoustic spectra. The most sensitive method of detection is using an airborne ultrasonic microphone centered at 40 khz. This method is very successful at detecting partial discharge activity provided there is an air passage between the source and the microphone.


Flexible Sensor

The Flexible Sensor provides a means of reaching inaccessible parts on the switchgear. The sensor is mounted at the end of a good-nmeck which allows the angle of the sensor to the handle to be adjusted. This allows the user to make measurement where it would be difficult to use the built in sensor and still be able to read the display.


Ultrasonic Contact Probe

The Ultrasonic Contact Probe is provided to enable discharges to be detected in enclosed areas where there is no direct air path from the discharge source to the sensor. The probe connects to the external sensor connector and is clamped on to the area of interest using the magnets surrounding the sensor plate. The probe will detect discharge sources inside the enclosed area by detecting the energy transmitted to the enclosure.

Our Services

HV Services

Contact Us