Electrical Machines

## Three-Phase Transformer Winding Connections

In a single-phase as well as three-phase transformer the windings are placed on the core structure which is made up of laminated steel core. This core structure which supports the two windings of the transformer is placed i…

## Transformer with Leakage Reactance & Leakage Flux

What is Leakage Flux in a Transformer ?      We know that all the flux linked with primary winding is also linked with the secondary winding. But, in the actual transformer the total flux created does not link with the primary…

## Back-to-Back Test or Sumpner's Test on Transformer

Why Sumpner's Test or Back to Back Test ?      For a transformer, the temperature rise is an important factor to be noted before making it into operation. The temperature of a transformer changes in proportion with the loa…

## Construction of DC Generator - Each Part Explanation

Electricity generated at all the power plants is alternating i.e., A.C. In order to generate direct current i.e., d.c. a commutator is used to convert the generated a.c. supply into d.c. supply. Hence, an electrical generat…

## What is Open Circuit Test of Transformer ? Phasor Diagram & Calculation

The performance ( efficiency, regulation, losses ) of a transformer is best judged if the following four parameters of its equivalent circuit are known : The equivalent resistance  R 01  is referred to as primary, and …

## What is Blocked Rotor Test of Induction Motor ?

Blocked rotor test, it is quite opposite to the no-load test of the induction motor. Usually in transformer tests, if we want to find the behavior of a transformer on loading and on no-load, it can be done by using open ci…

## What is Ideal Transformer ? - Phasor Diagram & Model

What is Ideal Transformer ?      An ideal transformer is one that has no losses i.e., its windings have no resistance, there is no magnetic leakage, and hence which has no iron and copper losses. It may, however, be noted t…

## What is a Transformer ? - Definition & Working Principle of Transformer

As we know that most electrical power plants are located far away from the load centers. Because the electrical energy generated by thermal and hydro or any other power plants are located at a distance from the consumers.…

## Necessity and Methods of Starting an Three Phase Induction Motor

Necessity of Starting a Three-phase Induction Motor :      In a 3-phase Induction motor, the magnitude of rotor induced emf depends upon slip. Rotor current,      At starting, the magnitude of rotor induced emf and sli…

## Shaded Pole Induction Motor - Construction, Working Principle & Applications

As we know that a single-phase induction motor is not a self-starting motor. In order to make it self starting, changes are to be done to the construction. Let us see the construction and working principle of the shaded …