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Overhead Ground/Shield Wire

Why are ground wires installed at the top of 400 kV transmission towers?
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Answer & Explanation
Correct AnswerB. To provide shielding of phase conductors from lightning strokes

Quick Explanation

Overhead ground (shield) wires are positioned above the phase conductors to intercept direct lightning strokes and conduct the surge current safely to earth through the towers. Their principal purpose is lightning shielding.

Overhead Ground/Shield Wire explanatory diagram

Detailed Explanation

Correct Answer

B — To provide shielding of phase conductors from lightning strokes

Explanation

Overhead ground (shield) wires are positioned above the phase conductors to intercept direct lightning strokes and conduct the surge current safely to earth through the towers. Their principal purpose is lightning shielding.

Key Concept

Overhead Ground/Shield Wire

Exam Point

Top shield wire = lightning interception and earth path.

Quick Trick

Top shield wire = lightning interception and earth path.

Exam Tip

Top shield wire = lightning interception and earth path.

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