PowerWorld Transmission Line Parameter Calculator Version 2
PowerWorld Transmission Line Parameter Calculator Version 2
PowerWorld Transmission Line Parameter Calculator Version 2
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<strong>Transmission</strong> <strong>Line</strong> <strong>Parameter</strong> <strong>Calculator</strong> <strong>Version</strong> 2<br />
Where:<br />
D<br />
SC<br />
Geometric mean radius in meters<br />
r External radius of conductor in meters<br />
d Distance between conductors k and m in meters.<br />
km<br />
Note: If k = m, then d<br />
km<br />
= r.<br />
Conductance<br />
Assumed G = 0<br />
Where:<br />
G<br />
Conductance in Siemens/meter<br />
3.2 Lumped (Total) <strong>Parameter</strong>s<br />
Resistance, Inductive Reactance, Conductance and Susceptance, using the<br />
equivalent π circuit (long line)<br />
Z ′ = R′<br />
+ jX ′ =<br />
Z c<br />
sinh γ <br />
Y ′ = G′<br />
+ jB′<br />
=<br />
2 γ <br />
tanh<br />
2<br />
Z c<br />
Where:<br />
Z’ Total series impedance of line in Ohms<br />
Y’ Total series admittance of line in Siemens<br />
R’ Total series resistance of line in Ohms<br />
X’ Total series inductive reactance of line in Ohms<br />
G’ Total series conductance of line in Siemens<br />
B’ Total series susceptance of line in Siemens<br />
Z c Characteristic impedance in Ohms<br />
γ Propagation constant in meters -1<br />
<strong>Line</strong> length in meters<br />
The characteristic impedance and propagation constant are defined as:<br />
z<br />
Z c<br />
= γ = zy<br />
y<br />
Where:<br />
z<br />
y<br />
Distributed series impedance in Ohms/meter<br />
Distributed series admittance in Siemens/meter<br />
©<strong>PowerWorld</strong> Corporation<br />
15<br />
April 22, 2013
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