An overhead transmission line conductor consists of hard drawn copper conductor ofdiameter 15 mm, having a dead weight of 1120 kg/km and spanning 150 metres. Thesupporting structures are at equal levels. The conductor has an ultimate tensile stress of 43.2kg/mm and allowable tension is not to exceed 1/4th of ultimate strength. Find the verticalcomponent of the sag under the following conditions:still air,(i)(ii)an ice coating of 12 mm.Assume density of ice as 0.925 g/cm.

Answered: Image /qna-images/answer/69bb36de-df40-4323-bcc7-3fff947fb335.jpg

Answered: An overhead transmission line conductor…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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O List any three factors to be considered for mechanical design of overhead lines (i) An overhead transmission line is supported at a river crossing by two towers of height 38 m. The weight of the conductor is 0.307 kg/m. The weight due to wind is 1.4 kg/m. The ultimate strength is 1100 kg and factor of safety is 2. If the Span length is 140 m. Determine (a) Total weight of the conductor (. (b) Sag ( (c) Total Length of conductor between supports (d) Clearance between the lowest point on the conductor and water level.. Total Weight of the conductor Sag Total Length of the conductor between the supports Clearance between the lowest point on the conductor and water level
Question 1: The spacing for a 3-phase horizontally spaced line operating at 50 Hz, 132 kV, is 1.6 m between adjacent conductors. The diameter of each conductor is 0.8 cm. Determine the capacitance to neutral for the lines, and also the line charging current. Question 2:
For a 3-unit suspension insulator string ratio of ground to mutual capacitance is Consider voltage across unit nearest to the line is 20 kV & voltage across adjacent unit is 15 kV.
For the polished conductors having radius of 1 cm equally at a distance of 100 cm, caring of 3 phase supply line under 76 cm pressure at 25 degree centigrade. For the standard condition, find the minimum phase neutral voltage at which corona occurs.
The Cost OF Single phase overhead feeder is OMR q Per KM(a is area of cross section in sq mm) and the intrest and depre Ciation Chargs onfeeder omical carrent density are 7Y. defermain to use for the most econor requiring Full load current of 27% of the 12 baisa is year. The Cost per unit ass ume resistance of Im lenahth length and I mm² secfion of Conductor as 1/32 find Current densi ty =?
Electrical Engineering A 240V single phase circuit is run in conduit in 2 core 70°C PVC/PVC cable having live a) conductor of 2.5 mm (leperating is approximately 20A) and protection conductor cable (cpc) of 1.5 mm If the circuit is protected by 30 HRC fuse, with circuit length of 55 m, and Zg is 0.8 0 EVALUATE whether the initial cip.c. size provided is adequate. Given 2 core PVC/PVC bunched cable impedance is (R +R2) 26.9 m2/m and k -115.
Q1. Transmission and distribution lines are important components of any power system study. (A) In relation to high voltage overhead ac transmission lines, Discuss the choice of materials for the conductors in terms of their electrical/mechanical properties and the costs involved. Discuss the factors that determine the distance (D) between phase conductors and explain the impact of the distance D on the inductance and capacitance values of the line at different voltage levels. Support your arguments with relevant equations where appropriate. Discuss the impact of the radius of the conductors on phase capacitance and inductance values and why bundles are used at very high voltages.
Write any four methods of voltage control and Draw the basic block diagram of AC – DC transmission system. and A transmission line has a span of length 250 m and the weight of the conductor per metrelength is 0.63 Kg. The tension in the conductor is 1250 Kg. Calculate the sag and heightabove the ground at which the conductor should be supported. Consider the groundclearance required is 13m

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