b) A high-voltage twin-wire transmission line comprises two cylindrical copper conductors running parallel to each other in air. The two conductors are solid, having radius a = 10mm. The spacing between conductor centres D = 100mm One conductor is grounded, and the other conductor raised to 25kV. i) Sketch the electric field and equipotential distribution on a cross-section of the transmission line, labelling the most important features. ii) Calculate the capacitance per unit length of this twin wire line in picofarads per metre. iii) Show that the free charge accumulated on each conductor is approximately ±0.3μC/m.

b) A high-voltage twin-wire transmission line comprises two cylindrical copper conductors running parallel to each other in air. The two conductors are solid, having radius a = 10mm. The spacing between conductor centres D = 100mm One conductor is grounded, and the other conductor raised to 25kV. i) Sketch the electric field and equipotential distribution on a cross-section of the transmission line, labelling the most important features. ii) Calculate the capacitance per unit length of this twin wire line in picofarads per metre. iii) Show that the free charge accumulated on each conductor is approximately ±0.3μC/m.

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 4.14MCQ: For a three-phase three-wire line consisting of three solid cylindrical conductors each with radius...

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Question

b) A high-voltage twin-wire transmission line comprises two cylindrical copper
conductors running parallel to each other in air. The two conductors are solid,
having radius a = 10mm. The spacing between conductor centres D = 100mm
One conductor is grounded, and the other conductor raised to 25kV.
i)
Sketch the electric field and equipotential distribution on a cross-section of
the transmission line, labelling the most important features.
ii) Calculate the capacitance per unit length of this twin wire line in
picofarads per metre.
iii) Show that the free charge accumulated on each conductor is
approximately ±0.3μC/m.

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