If sag in an overhead line increase, tension in the line

A. increase
B. decrease
C. remains same
D. none of the above

Answer: 

Explanation:
In a transmission line, sag is defined as the vertical difference in level between points of support (most commonly transmission towers) and the lowest point of the conductor.

Where, l = length of the conductor
w = weight of the conductor
T = tension

Therefore, by increasing of temperature, the length of the conductor will increase and this will increases the sag. 
Tension is inversely proportional to sag.

Sag S ∝ 1/T

As sag increases, tension will decrease.


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