Flip on the lights, and you’re completing a circuit that connects your light bulb to the wires that serve your house, to the larger wires that serve your neighborhood and, ultimately, to a network of high capacity wires that deliver power over great distances. This network the power transmission system is complex, costly and critical to the nation’s economy and way of life. Many of those who influence the electric industry, however, lack a good understanding of the transmission system.
Short Transmission Line
The transmission lines which have length less than 80 km are generally referred as short transmission lines. For short length, the shunt capacitance of this type of line is neglected and other parameters like electrical resistance and inductor of these short lines are lumped, hence the equivalent circuit is represented as given below,
Medium Transmission Line
The transmission line having its effective length more than 80 km but less than 250 km, is generally referred to as a medium transmission line. Due to the line length being considerably high, admittance Y of the network does play a role in calculating the effective circuit parameters, unlike in the case of short transmission line For this reason the modelling of a medium length transmission line is done using lumped shunt admittance along with the lumped impedance in series to the circuit.
Long Transmission Line
A power transmission line with its effective length of around 250 Kms or above is referred to as a long transmission line. Calculations related to circuit parameters (ABCD parameters of such a power transmission is not that simple, as was the case for a Short Transmission Line or a Medium Transmission Line. The reason being that, the effective circuit length in this case is much higher than what it was for the former models (long and medium line) and, thus ruling out the approximations considered there like.
Transmission Tower Body
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