4) A lightning strikes a 30-m unshielded over-head transmission line following parameters: the Surge impedance of the tower 10 2 Surge impedance of lightning channel at tower top 500 2 Tower-footing resistance = 10 2 Tower height 30 m Cross-arm height= 27 m The lightning strike current is assumed to be a constant 30 kA for a duration of 20 us. The traveling wave propagation speed in the tower is 1.2 x 10 m/s. i) Determine the voltage reflection coefficients at tower top and tower foot. ii) Determine the time of travel from tower top to tower foot. iii) Determine the time of travel from cross arm to tower foot. iv) Draw the voltage lattice diagram with proper labels of the time. v) Ignoring the phase voltage, determine the insulator voltage after 2 µs.

4) A lightning strikes a 30-m unshielded over-head transmission line following parameters: the Surge impedance of the tower 10 2 Surge impedance of lightning channel at tower top 500 2 Tower-footing resistance = 10 2 Tower height 30 m Cross-arm height= 27 m The lightning strike current is assumed to be a constant 30 kA for a duration of 20 us. The traveling wave propagation speed in the tower is 1.2 x 10 m/s. i) Determine the voltage reflection coefficients at tower top and tower foot. ii) Determine the time of travel from tower top to tower foot. iii) Determine the time of travel from cross arm to tower foot. iv) Draw the voltage lattice diagram with proper labels of the time. v) Ignoring the phase voltage, determine the insulator voltage after 2 µs.

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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