Select the INCORRECT statement for an overhead transmission line supported by supports at equal levels.

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SSC JE Electrical 10 Oct 2023 Shift 2 Official Paper-I
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  1. Sag is inversely proportional to the height of the supporting tower.
  2. Sag is inversely proportional to the tension of the conductor.
  3. Sag is directly proportional to the weight per unit length of the conductor.
  4. Sag is directly proportional to the square of the length of the conductor span.

Answer (Detailed Solution Below)

Option 1 : Sag is inversely proportional to the height of the supporting tower.
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Detailed Solution

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Concept

The sag in an overhead transmission line is given by:

where, S = Sag

W = Weight per unit length of the conductors

L = Length of span

T = Tension of the conductor

From the above expression, we found that sag has no relation with the height of the supporting tower. Therefore, it is an INCORRECT statement.

Hence, the correct answer is option 1.

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