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Define Short Lines?
For short power lines (up to 50 miles; 80 km), the effects of the shunt capacitance and leakage resistance are negligible. Hence the line may be represented by the equivalent circuit shown in Figure.
In this case:
IS = IR (1)
and VS = VR + ZIR (2)
Comparing equations (1) and (2) with equations
VS = AVR + B IR
IS = C VR + D IR
the 2-port network constants are:
A = 1, B = Z
C = 0, D = 1 = A
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