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Chapter: Transmission and Distribution : Modelling and Performance of Transmission Lines

Surge Impedance Loading

Surge impedance of a line, Zo - Transmission and Distribution - Modelling and Performance of Transmission Lines

SURGE IMPEDANCE LOADING

Surge impedance of a line, Zo


A transmission line loaded to its surge impedance loading:

(i) has no net reactive power flow into or out of the line, and

(ii) will have approximately a flat voltage profile along its length.

 

For (i) to hold:


This means that there will be no net reactive power flow at surge-impedance loading.

 

For (ii) to hold:



This means that the line will have a flat voltage profile, i.e., no voltage drop.


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