Corona discharge on high-voltage conductors in darkness is visually identified by a:
Direct Answer
Option B: Faint violet / bluish glow
Corona discharge occurs when the electric field strength exceeds the dielectric breakdown of air, ionizing gas molecules. This phenomenon manifests as a faint violet or bluish glow, often accompanied by ozone production. Detecting this visual signature is critical for identifying insulation degradation or surface contamination on high-voltage bushings and conductors during routine night inspections.
All Options
Detailed Explanation & Context
Corona discharge occurs when the electric field strength exceeds the dielectric breakdown of air, ionizing gas molecules. This phenomenon manifests as a faint violet or bluish glow, often accompanied by ozone production. Detecting this visual signature is critical for identifying insulation degradation or surface contamination on high-voltage bushings and conductors during routine night inspections.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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