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LID – UPD – SUBSTATION
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Introduction: PD is an electrical discharge that occurs across a localized area of the insulation between two conducting electrodes, without completely bridging the gap (see IEC 60270). It can be caused by discontinuities or imperfections in the insulation system. PD activity is an indication of an incipient medium voltage (MV) or high voltage (HV) insulation fault and is widely regarded as the best early warning indicator of electrical insulation deterioration in MV and HV electrical assets
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Partial Discharge: Partial Discharge testing and monitoring is particularly important when the medium or high voltage asset is critical to the operation of a network; this may be due to the asset’s age, limited network redundancy, past failures or the financial consequences of a failure. Examples of MV and HV plant that can be tested/monitored include:
- Cables and cable accessories (terminations, joints, sealing ends)
- Switchgear (AIS, SIS & GIS)
- Power Transformers and Bushings
- Transformers (Oil Filled & Dry Type)
- Instrument Transformers (Voltage & Current)
- Capacitors
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