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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) Ignoring the phase voltage, determine the insulator voltage after 2µs.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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  1. 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.    

 

 

 

 

 

 

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