Power System - Transmission and Distribution - Electrical Engineering (MCQ) questions and answers for Q. 17057

Q.  A 132 kV transmission line, with the weight of conductor = 680 kg/km, length of span = 260 m, ultimate strength = 3100 kg, safety factor =2. Calculate the height above ground at which the conductor should be supported. Ground clearance required is 10 m.
- Published on 23 Nov 15

a. 10.7 m
b. 13.7 m
c. 20.83 m
d. 18.75 m

ANSWER: 13.7 m

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    Discussion

  • sowmya   -Posted on 04 Feb 18
    weight of th conductor=680/1000 =0.68 kg
    working tension , T=ultimate strength / safety factor
    =3100 / 2 =1550 kg
    span length , l = 260 m
    sag = wl^2 / 8T
    =3.7 M
    ground clearance = 10m
    conductor should be supported at a height = 10 + 3.7 =13.7 m
  • justice   -Posted on 13 Dec 17
    Write your comment here...please i would like if get the breakdown of the calculation.The calculations steps that gave the result to be 13.7m
  • justice   -Posted on 13 Dec 17
    Write your comment here...please i would if get the breakdown of the calculation.
  • Barnabas   -Posted on 17 Jul 17
    Please I need a breadown on how you solved this calculation with formulars involved.
    Than you.
  • hein   -Posted on 05 Mar 16
    I want to know it.

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