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.
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Transcribed Image Text: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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