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A 230 kV, 100 km, 60 Hz, nominal current of a three-phase air transmission line is 900 A / phase.

A 230-kV, 100-km, 60-Hz three-phase overhead transmission line with a rated current of 900 A/phase has a series impedance z = 0.088 + j0.465 Ω/km and a shunt admittance y = j3.524 μS/km.

(a) Obtain the nominal π equivalent circuit in normal units and in per unit on a base of 100 MVA (three phase) and 230 kV (line-to-line).

(b) Determine the three-phase rated MVA of the line.

(c) Compute the ABCD parameters.

(d) Calculate the SIL.

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