MPAC – Professional Accoustic Imaging Camera www.megger.com10Partial dischargeWhat is partial discharge?Partial discharge (PD) refers to a localized breakdown of insulation in an electrical system, typically in high-voltage equipment such as transformers, cables, and switchgear. It is a phenomenon where a small electrical discharge occurs in a portion of the insulation material, rather than a complete breakdown of the entire insulation system. Partial discharges can be caused by various factors, including impurities in the insulation material, voids, cracks, or other imperfections.What causes partial discharge? Partial discharge is small electrical sparks in high voltage insulation systems caused by voids or gaps that allow dielectric breakdown when voltage exceeds the air gap withstand. It gradually degrades insulation.What type of equipment experiences PD issues? High voltage electrical equipment like switchgear, transformers, motors, generators, and cables. It is also common in aviation, vehicles, and insulating materials. What are some partial discharge indicator patterns?Corona (irregular discharge around sharp metal edges), surface tracking, arcing across wires or terminals, sparks through insulating barriers or cracks.Is all partial discharge hazardous? Not necessarily initially, but it indicates insulation flaws that can lead to failure. PD causes deterioration and cumulative damage over time.What problems can untreated PD cause long-term? Ultimately, total voltage breakdown failure causes fires, explosions and electrical shutdowns.
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