Voltage Regulation and Efficiency of Transmission Line

We know that, Electric Power is transmitted using three phase transmission system due to its own advantages. But for any system it is very important to define some parameters to evaluate the performance. Therefore, there must be some parameters which define the performance of transmission line. Yes, there are two parameters namely, Voltage Regulation and … Read more

Transmission Line Performance – Calculation

Transmission Line Performance is determined by two parameters. Those parameters are Voltage Regulation and Transmission Efficiency. In this post we will be discuss and evaluate the performance of short transmission line. As we know that the effect shunt capacitance of line is neglected for short transmission line. Therefore, for the sake of study and analysis … Read more

Effect of Unsymmetrical Spacing of 3 Phase Line Conductors

When the distance between the three phase line conductors are not same i.e. they are not spaced equally from each other then it is said to have unsymmetrical spacing. Unsymmetrical spacing of overhead line conductors give rise to unequal voltage in the individual phases at the receiving end even though the flow of current in … Read more

Line Loadability – Universal Line Loadability Curve

Loadability of line is defined as the extent of load which can flow through the line without exceeding the limitations. Line Loadability is expressed in percentage of Surge Impedance Loading of line. The limiting factor for line loading are: thermal limit, voltage drop limit and steady state stability. The loading of line shall not exceed … Read more

Surge Impedance and Surge Impedance Loading

Surge Impedance is the characteristic impedance of a lossless transmission line. It is also called Natural Impedance because this impedance has nothing to do with load impedance. Since line is assumed to be lossless, this means that series resistance and shunt conductance is negligible i.e. zero for power lines. This means that, Series Resistance R … Read more

Characteristic Impedance of Transmission Line

Characteristic Impedance of a Transmission line is defined as the square root of ratio of series impedance per unit length per phase and shunt admittance per unit length per phase. If z and y are series impedance and shunt admittance of line, the characteristic impedance Zc is given as Zc = √(z/y) Where z = … Read more

Vibration and Vibration Dampers in Transmission Line

The overhead Transmission Line experiences vibrations in vertical plane. This vibration of Transmission Line in vertical plane can be categorized into two groups. 1) Aeoline Vibration 2) Galloping or Dancing of Conductors Aeoline Vibration is of high frequency and low amplitude. The frequency of vibration is of the order of 5 to 40 cycle/second while … Read more