HV Exit Exam • Set 4 Question 25 of 30

Which of the following is a recognized advantage or positive effect of corona discharge on power lines?

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Direct Answer

Option C: Attenuates steep-fronted voltage surges and reduces electrostatic stress concentration

Corona increases the effective virtual diameter of conductors, which reduces surface electrostatic stress and dissipates high-frequency lightning/switching surge energy through localized ionization.

All Options

Increases power transmission efficiency

Eliminates radio interference completely

Attenuates steep-fronted voltage surges and reduces electrostatic stress concentration (Correct Answer)

Prevents conductor oxidation

Detailed Explanation & Context

Corona increases the effective virtual diameter of conductors, which reduces surface electrostatic stress and dissipates high-frequency lightning/switching surge energy through localized ionization.

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

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