Answered: 1. How do voids in the insulation cause…

1. How do voids in the insulation cause breakdown of the cable? 2. Discuss why the transmission lines are 3 phase 3 wire circuits while secondary distribution lines are 3 phase 4 wire circuits.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter4: Transmission Line Parameters

Section: Chapter Questions

Problem 4.5P: A 60-Hz, 765-kV, three-phase overhead transmission line has four ACSR 900 kcmil 54/3 conductors per...

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1. How do voids in the insulation cause
breakdown of the cable?
2.Discuss why the transmission lines are 3
phase 3 wire circuits while secondary
distribution lines are 3 phase 4 wire circuits.

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A 60 Hz, three-phase, transposed transmission line, is designed with three bobolink conductors per phase, in horizontal arrangement as shown in the figure below. Distance between consecutive phases is D = 6.2 m and distance among bundle conductors is h =0.5m. Each conductor has a radius of 18 mm and a GMR of 14.39mm. The per phase resistance is 1.677x10-5 2/m. r= 18 mm GMR= 14.39 mm a b h D D The per phase shunt admittance assuming zero conductance in µO/km is: О a., 5.4347 O b. j5.3316 О с /4.2266 O d. j4.0973 O e. 59630.2922 + j10.9770
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a.Why does power plants have high amounts of voltages? Explain. b.Is it safe for transmission lines to have high current instead of high voltage? Why? c.What phenomenon is avoided by having separations between three conductor phases? Explain this phenomenon.
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