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HV Exit Exam • Set 6 Question 3 of 30

Which of the following statements concerning corona discharge on power transmission lines is INCORRECT?

✓

Direct Answer

Option C: Corona discharge in air appears as a bright red luminescence

Corona discharge is characterized by a violet glow, not red luminescence. It results from localized air ionization, causing audible hissing, ozone generation, and power losses. These discharges interfere with electromagnetic communications and indicate potential insulation failure. Recognizing these symptoms is essential for maintaining the integrity of shipboard high-voltage distribution systems under STCW safety standards.

All Options

A
Corona gives rise to radio and television interference
B
Corona results in active power loss on transmission lines
C
Corona discharge in air appears as a bright red luminescence (Correct Answer)
D
Corona is accompanied by a characteristic hissing and cracking noise

Detailed Explanation & Context

Corona discharge is characterized by a violet glow, not red luminescence. It results from localized air ionization, causing audible hissing, ozone generation, and power losses. These discharges interfere with electromagnetic communications and indicate potential insulation failure. Recognizing these symptoms is essential for maintaining the integrity of shipboard high-voltage distribution systems under STCW safety standards.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).

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