Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 17, Problem 2PP

Assume that the voltage drop across the resistor, E R , is 78 V, that the voltage drop across the inductor, E L , is 104 V, and the circuit has a total impedance, Z, of 20 Ω . The frequency of the AC voltage is 60 Hz.

E T _____ I T  _____ Z 20  Ω VA _____ PF _____ E R 78 V I R  _____ R _____ P _____ θ _____ E L 104 V I L  _____ X L _____ VARs L  _____ L _____

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A lightning strikes a 30-m unshielded over-head transmission line tower Which has the following parameters   Surge impedance of the tower= 100ohms Surge impedance of lightning channel at tower top =500ohms Tower-footing resistance=10ohms Tower height =30 m Cross-arm height=27m The lightning strike current is assumed to be a constant 30 kA for a duration of 20 µs. The raveling wave propagation speed in the tower is 1.2* 10­­8 m/s. i) Determine the voltage reflection coefficients at tower top and tower foot.    ii) Ignoring the phase voltage, determine the insulator voltage after 2µs.
A lightning strikes a 30-m unshielded over-head transmission line tower Which has the following parameters Surge impedance of the tower= 100ohms Surge impedance of lightning channel at tower top =500ohms Tower-footing resistance=10ohms Tower height =30 m Cross-arm height=27m The lightning strike current is assumed to be a constant 30 kA for a duration of 20 µs. The raveling wave propagation speed in the tower is 1.2* 10­­8 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 2µs.   b) The insulator voltage approaches a constant value after 2 µs. If the basic impulse insulation level (BlL) of the insulator for phase conductor is 150 kV, evaluate the condition of the…

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Delmar's Standard Textbook Of Electricity

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