On-Line Partial Discharge (PD) Test Services
For Medium Voltage and High Voltage Switchgear
Power Quality Engineering Sdn Bhd utilise the advance Partial Discharge Test System and Partial Discharge Event Recognisation Software to carry out On-Line (in-service) Partial Discharge Testing of Medium Voltage Solid Insulated and Air-Insulated Switchgear.
On-line Partial Discharge Testing is carried out using a combination of capacitive TEV sensors which are magnetically attached to strategic positions on the switchgear panel, busbar or cable box.
The Partial Discharge Event Recognisation software automatically differentiates between the captured waveforms of 'local' switchgear Partial Discharge pulses and electrical 'noise' such as thyristor switching and RF noise to provide an instant On-line diagnosis of Partial Discharge activity.
On-line PD Testing of Medium & High Voltage Gas Insulated Switchgear (GIS)
PQE Engineers utilize the advance Partial Discharge Test System and Partial Discharge Event Recognisation software to carry out both On-Line (in-service) and Off-line (laboratory and commissioning) Partial Discharge Testing of HV Gas Insulated Switchgear (GIS).
On-line Partial Discharge Testing is carried out using capacitive TEV sensors (attached to the various positions along the GIS). The software packages are used to detect and locate PD activity within the GIS.
The Benefits of On-Line Partial Discharge Testing are:
- It is truly a predictive test, indicating insulation degradation in advance of the failure (the detection of 'incipient' faults).
- It is a non-intrusive test, requiring no interruption of service and is performed under normal operating voltage and load.
- It is a nondestructive test i.e. it does not test to failure or adversely affect the equipment under test.
- It does not use any overvoltages, thereby not exposing the tested equipment to higher voltage stresses than those encountered under normal operating conditions.
- Trending can be accomplished by storing results to allow comparison with future tests.
- In many instances the site of the partial discharge occurrence can be located within the test object, so the localized problem can be repaired.
- The cost to perform an On-line PD survey is relatively inexpensive compared with off-line testing, allowing annual surveys to be performed economically at most facilities.
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