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 />
3 Calculations<br />
3.1 Distributed <strong>Parameter</strong>s<br />
Resistance<br />
Where:<br />
R t<br />
t<br />
R 25<br />
R 50<br />
R 75<br />
N<br />
R t<br />
⎛ ⎛ R25<br />
− R50<br />
⎞<br />
R<br />
( t ) ⎟ ⎞<br />
⎜<br />
25<br />
+ ⎜ ⎟ − 25<br />
⎝ ⎝ 25 − 50 ⎠<br />
=<br />
⎠<br />
N<br />
⎛ ⎛ R50<br />
− R75<br />
⎞<br />
R<br />
( t ) ⎟ ⎞<br />
⎜<br />
50<br />
+ ⎜ ⎟ − 50<br />
⎝ ⎝ 50 − 75 ⎠<br />
=<br />
⎠<br />
N<br />
R t<br />
0 ≤ t ≤ 50<br />
50 ≤ t<br />
AC resistance at temperature t per phase per 1 mile in Ohms<br />
Assumed temperature in Celsius degrees<br />
AC resistance of the conductor at 60 Hz and 25°C per 1 mile in Ohms<br />
AC resistance of the conductor at 60 Hz and 50°C per 1 mile in Ohms<br />
AC resistance of the conductor at 60 Hz and 75°C per 1 mile in Ohms<br />
Number of conductors per phase<br />
Inductive Reactance<br />
D<br />
−7 eq<br />
X<br />
L<br />
= 4π<br />
f × 10 ln<br />
DSL<br />
Where:<br />
X L Inductive reactance in Ohms/meter<br />
f Frequency of the system in Hertz<br />
D<br />
eq<br />
Geometric mean distance between phases in meters<br />
D<br />
SL<br />
Geometric mean radius between conductors of one phase in meters<br />
The geometric mean distance between phases is defined as:<br />
D<br />
3<br />
eq<br />
= d<br />
abd<br />
bcd<br />
ca<br />
Where:<br />
d<br />
ab<br />
, d<br />
bc<br />
, d<br />
ca<br />
Distances between phases a-b, b-c, c-a, respectively in meters<br />
©<strong>PowerWorld</strong> Corporation<br />
13<br />
April 22, 2013
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