Keeping all other factors the same, if span length is doubled the sag of the transmission line will become

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Keeping all other factors the same, if span length is doubled the sag of the transmission line will:

  1. Half
  2. Double
  3. Triple
  4. Quadruple

Correct answer: 4. Quadruple

Keeping all other factors the same, if span length is doubled the sag of the transmission line will quadruple.

Formula for sag is:

Sag = wl2/8T

Keeping other factors same

Sag ∝ l2

Let’s assume orginal sag

Sag(1) ∝ l2

Now when span is doubled

Sag(2) ∝ (2l)2

Sag(2) ∝ 4.l2

Sag (2) ∝ 4.Sag(1)

So, while Keeping all other factors the same, if span length is doubled the sag of the transmission line will become 4 times the original sag.

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