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## 02/03/2021

### Factor affecting sag in the transmission line

The equation of the sag is

S = WC L2 / 8T

Where

S = Sag

WC = Weight of conductor per meter

L = Length of conductor

T = Tension on conductor

Weight of conductor

• As the weight of conductor increases, the sag also increases.
• The ice formation on the conductor also increases the sag on the transmission line.

S α ( WC )

Span ( length of conductor )

• The sag is directly proportional to square of length of conductor.
• If the length of conductor double, the sag increases four times.

S α ( L2 )

Tension

• The sag and tension are inversely proportional.
• As the tension on the conductor increases, the sag decreases.
• The tension on the conductor increases by wind pressure, ice loading and natural disasters.

S α ( 1 / T )

Temperature

• As the temperature increases, the length of conductor expand and vice versa therefore the sag increases as the temperature increases.

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