The equation of the sag is

S = W_{C} L^{2} / 8T

Where

S = Sag

W_{C} = 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 ( W_{C} )

**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 ( L^{2} )

**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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