Question
Download Solution PDFThe figure represents the case of transmission line supports at unequal levels. S2 - S1 is directly proportional to:
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
Sag for unequal tower length:
\(h=S_2-S_1\)
\(h={WL_2^2\over 8T}-{WL_1^2\over 8T}\)
\(h={W\over 8T}(L_2^2-L_1^2)\)
\(h={W\over 8T}(x_2^2-x_1^2)\)
\(h={W\over 8T}(x_2-x_1)(x_2+x_1)\)
∴ (S2 - S1) α (x2 - x1)
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