## 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...

## All Day Efficiency of Distribution Transformer

All Day Efficiency is defined as the ratio of total energy output for 24 hrs i.e. for the whole day to the total energy input for the same day. All Day Efficiency is basically Energy Efficiency of Transformer calculated for a period of 24 hrs....

## Torque Slip Characteristics of Induction Machine

Torque Slip Characteristics is the graphical relationship between the torque and slip of an Induction Machine. This characteristic is very useful for the stability analysis of the machine. Electromagnetic torque in an Induction Machine is given as Te = [Kx(r2/s)] / [(Re + r2/s)2 +...

## How Core Laminations Reduces Eddy Current Loss?

We are well aware of the fact that electrical machine core is made up of laminated sheets. This is done to reduce the eddy current loss. But how laminated core reduces the eddy current loss and what is the relation between the Eddy Current Loss...

## Static Excitation System – Working Principle

Excitation system in a Generator is essential for the production of working magnetic flux in the air gap. It is usually provided by having filed winding on the rotor in case of Synchronous Generator. Providing field winding on the rotor possess certain advantages over field...

## Generator Compounding Characteristics

Generator Compounding Characteristics is a curve depicting the variation of field current required to maintain a constant generator terminal voltage. Generator terminal voltage is maintained constant by controlling its field current either manually or by Automatic Voltage Regulator (AVR). Let us consider the phasor relation...

## Generator V-Curve and Power Factor Control

V-curve and power factor control of generator are closely related to each other. V-curve of Generator is basically a plot of variation of armature current with the change in field current. For a constant power, V-curve can only be obtained for  generator connected to infinite bus / grid....

## What is Ferroresonance?

Ferroresonance is a resonance phenomenon caused by the nonlinear inductance and system capacitance. For better understanding of ferroresonance, it is worth to remind the linear resonance in LRC circuit. Linear Resonance Let us consider a linear LRC circuit as shown in figure below. Total Impedance...