## Nominal T model of a transmission line

In a nominal T model of a medium transmission line, the series impedance is divided into two equal parts, while the shunt admittance is concentrated at the centre of the line. The nominal T model of a medium transmission line is shown in the figure. Here, Series impedance of the line Z = R + …

## Single Line-to-Ground Fault

Generally, a single line-to-ground fault on a transmission line occurs when one conductor drops to the ground or comes in contact with the neutral conductor. Such types of failures may occur in power system due to many reasons like high-speed wind, falling off a tree, lightning, etc. Circuit diagram of single line-to-ground fault Suppose the …

## Capacitance of Transmission Line

Transmission line conductors constitute a capacitor between them. The conductors of the transmission line act as a parallel plate of the capacitor and the air is just like a dielectric medium between them. The capacitance of a line gives rise to the leading current between the conductors. It depends on the length of the conductor. …

## Inductance of Transmission Line

In the medium and long transmission lines inductance (reactance) is more effective than resistance. The current flow in the transmission line interacts with the other parameter, i.e the Inductance. We know that when current flow within a conductor, magnetic flux is set up. With the variation of current in the conductor, the number of lines …

## Nominal Pi Model of a Medium Transmission Line

In the nominal pi model of a medium transmission line, the series impedance of the line is concentrated at the centre and half of each capacitance is placed at the centre of the line. The nominal Pi model of the line is shown in the diagram below. In this circuit, By Ohm’s law By KCL …

## 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 …

## Charging Current in Transmission Line

In a transmission line, air acts as a dielectric medium between the conductors. When the voltage is applied across the sending end of the transmission line, current starts flowing between the conductors (due to imperfections of the dielectric medium). This current is called the charging current in the transmission line.In other words, we can say, …

## Long Transmission Line

A transmission line having a length more than 240 km is consider as a long transmission line. In a long transmission line, parameters are uniformly distributed along the whole length of the line. For a long transmission line, it is considered that the line may be divided into various sections, and each section consists of …

## ABCD Parameters of Transmission Line

Transmission of power from generating unit to distributing units can be done through the transmission line. During transmission, many losses occur in the transmission line which decreases the efficiency of a line. For improving the proficiency of the transmission, two port networks are used. A network having two input and two output terminals is known …

## Short Transmission Line

A transmission line having its length less than 80 km is considered as a short transmission line. In short transmission line capacitance is neglected because of small leakage current and other parameters (resistance and inductance) are lumped in the transmission line. Single and three phase short transmission line The single phase line is usually short …