## Travelling Wave on Transmission Line

Travelling wave on transmission line is the voltage / current waves which propagate from the source end to the load end during the transient condition. These waves travel along the line with the velocity equal to velocity of light if line losses are neglected. But...

## The Swing Equation – Definition and Derivation

What is Swing Equation? The Swing Equation of generator describes the relative motion between the rotor axis and the synchronously rotating stator filed axis with respect to time. This equation is very helpful in analyzing the stability of connected machines (machine here means generator). Derivation...

## 3 Phase Transformer versus Bank of 3 Single Phase Transformer

We know that the very basic purpose of Transformer is to transmit power at two different voltage levels. For example, if a generating station is generating electrical power at 21 kV and evacuates it power at 400 kV then a three phase transformer of voltage...

## Why Cable Bonding Required?

Cable bonding is basically the method of making electrical connection between the sheaths of two cables. Such electrical connection of sheaths may either be done at one end or at both the ends of the cable depending upon the application. In this post we will...

## Cable Sheath Loss and Its Calculation

When single core cable is used for AC power transmission, the current flowing through the core of cable set up pulsating magnetic field in its surrounding. This magnetic field links with the cable sheath and hence as per the Faraday’s Law an induced voltage is...

## Load Bus, Generator Bus and Slack Bus

Power System is nothing but the interconnection of various bus. Each of these buses are associated with four electrical parameters namely voltage with magnitude and phase angle, active power and reactive power. These fours parameters are not completely know but in practical situation only two...

## Calculation of Restriking Voltage

Restriking voltage is the transient voltage appearing across the breaker contacts immediately after the opening of breaker contacts. It is also called Transient Recovery Voltage (TRV). Restriking voltage is associated with high frequency which die out quickly. Even though restriking voltage is lasts for very...

## First Pole to Clear Factor- Calculation & Significance

First Pole to Clear Factor of a Circuit Breaker is the ratio of power frequency recovery voltage across the first pole to clear the arc to the normal phase to ground voltage when all the three poles of breaker are open. It is denoted as...