Question
Download Solution PDFA overhead transmission line is supported by supports at equal levels. If the length of the conductor span is increased by two times, the sag will _______. (Given, weight per unit length and tension in the conductor are constant.)
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept
The sag in an overhead transmission line is given by:
\(S={WL^2\over 8T}\)
where, S = Sag
W = Weight per unit length of the conductors
L = Length of span
T = Tension of the conductor
Explanation
Sag is proportional to the square of the length of the conductor span.
S α L2
\({S_1\over S_2}=({L_1\over L_2})^2\)
\({S_1\over S_2}=({L_1\over 2L_1})^2\)
S2 = 4S1
So, if the length of the conductor span is increased by two times, then the sag will increase by 4 times.
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