Medium Transmission Line

A transmission line having a length of more than 80 kms but less than 250 kms is considered as a medium transmission line. The parameters (Resistance, Inductance, and Capacitance) are distributed uniformly along the line. For a  medium transmission line, charging current is appreciable and due to the length of the line the shunt admittance plays a significant role in the calculation of the effective parameters of the line.

The shunt admittance and series impedance are considered as a lumped parameter of the medium transmission line. The medium transmission line is shown below in the diagram.

medium-line-circuitMany localized capacitance models have been used to make approximate line performance calculations. The following models are commonly used.

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