What is partial discharge (PD) in High Voltage electrical apparatus?
Direct Answer
Option C: Microscopic electrical sparks inside insulation voids that gradually erode dielectric strength
Partial discharge refers to localized electrical breakdowns within insulation voids. These microscopic sparks generate heat, ozone, and chemical byproducts that progressively degrade the dielectric material. Over time, this erosion leads to complete insulation failure, making PD monitoring a vital predictive maintenance tool for high-voltage motors and switchgear health.
All Options
Detailed Explanation & Context
Partial discharge refers to localized electrical breakdowns within insulation voids. These microscopic sparks generate heat, ozone, and chemical byproducts that progressively degrade the dielectric material. Over time, this erosion leads to complete insulation failure, making PD monitoring a vital predictive maintenance tool for high-voltage motors and switchgear health.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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