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Effect of Conductor Size on Corona

Which conductor characteristic is most effective in reducing the corona effect in EHVAC transmission lines?
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Answer & Explanation
Correct AnswerD. Large surface area

Quick Explanation

Increasing conductor diameter/surface area reduces the electric field intensity at the conductor surface. A lower surface gradient raises the disruptive-corona threshold and therefore reduces corona formation and loss.

Effect of Conductor Size on Corona explanatory diagram

Detailed Explanation

Correct Answer

D — Large surface area

Explanation

Increasing conductor diameter/surface area reduces the electric field intensity at the conductor surface. A lower surface gradient raises the disruptive-corona threshold and therefore reduces corona formation and loss.

Key Concept

Effect of Conductor Size on Corona

Exam Point

Larger conductor radius → lower surface electric stress → less corona.

Quick Trick

Larger conductor radius → lower surface electric stress → less corona.

Exam Tip

Larger conductor radius → lower surface electric stress → less corona.

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