## Difference between Ideal and Practical Transformer

Ideal transformer is an imaginary transformer devised for sake of analysis of a practical/real transformer. The main difference between an ideal and practical transformer is that former is having an efficiency of 100% while the latter have efficiency close to 100% (around 99%). Let us now discuss some more differences between ideal and practical transformer. … Read more

## Ideal Transformer – Definition, Properties and Phasor

Definition: Ideal Transformer is a hypothetical transformer having infinite permeability core and zero core loss and ohmic loss. An ideal Transformer does not exist in reality. This is just a hypothetical transformer for sake understanding the actual transformer. Properties of Ideal Transformer: Following assumption are made to define an ideal transformer: Winding Resistance is negligible. … Read more

## What is the Insulation Class of Transformer Oil?

Before we jump into the insulation class of Transformer Oil, it is imperative to discuss briefly about the insulation class. Insulation Class basically defines the maximum temperature at which an insulating material will perform its specified duty for the specified life on continuous basis. There are six insulation classes. These are tabulated below: Life of … Read more

## What is Transformer? – Definition and Meaning

Definition of Transformer: Transformer is a device which transfers electrical energy from one circuit to another through the medium of magnetic field and without change in the frequency. The electrical circuit which receives electrical power from the source is called the primary winding and another circuit which delivers the electric energy to load is called … Read more

## Load Test or Back to Back Test or Sumpner’s Test of Transformer

This article outlines the Load Test of Transformer. Load Test of Transformer is also known as Back to Back Test or Sumpner’s Test.  Load Test of a Transformer is basically carried out for determining the maximum temperature rise of the Transformer. However is not viable to conduct this test by connecting the secondary of the … Read more

## Short Circuit Test of Transformer

Short Circuit Test and Open Circuit Test are two important tests which are carried out on a Transformer to determine its equivalent circuit parameters, Voltage Regulation and Efficiency.   Transformer Short Circuit Test    Short Circuit Test of Transformer is performed on HV side and the supply voltage is so adjusted that rated current flows … Read more

## Open Circuit Test of Transformer

Open Circuit Test and Short Circuit Tests are two important tests which are carried out on a Transformer to determine its equivalent circuit parameters, Voltage Regulation and Efficiency. Though theses parameters can also be found using the physical dimension of Core and Winding detail but using Open Circuit and Short Circuit Tests are quite easy … Read more

## Parallel Operation of Single Phase Transformers

Parallel operation of two or more Transformers means that all the Transformers Primary is connected with the common supply and their Secondary are feeding to a common bus through which load is connected. Parallel operation of Transformers requires that their Primaries as well as Secondaries are connected in parallel. Parallel operation of two or more … Read more

## Voltage Regulation of a Transformer

Voltage Regulation of Transformer is defined as change in magnitude of Secondary Terminal Voltage per unit Rated Secondary Terminal Voltage when load at a given Power Factor is reduced to zero while maintain the Primary Voltage constant. Lets us assume that,   V2 = Secondary Terminal Voltage at any Load   E2 = Secondary Terminal … Read more

## Principle of On Load Tap Changer

A tap changer designed to operate while the Transformer is charged is called On Load Tap Changer (OLTC). On Load Tap Changer, OLTC is Make Before Break type which ensures that no sparking will take place while operating OLTC. On Load Tap Changer (OLTC) is used for short period or daily voltage regulation. During the … Read more