# What Is Transformer And Its Types Pdf

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A transformer is an electrical device which, by the principles of electromagnetic induction, transfers electrical energy from one electric circuit to another, without changing the frequency. The energy transfer usually takes place with a change of voltage and current.

In this tutorial, we will see a brief Introduction to Transformers. We will learn what is an electric transformer, the construction of a transformer, its working principle, classifications of transformers, losses and efficiency and some applications. A transformer is one of the most common devices found in electrical system that links the circuits which are operating at different voltages. These are commonly used in applications where there is a need of AC voltage conversion from one voltage level to another.

## Transformer types

In Very Simple words. Transformer is a device which Transfer Electrical power from one electrical circuit to another Electrical circuit. It's working without changing the frequency.

Work through on electric induction. When, both circuits take effect of mutual induction. Just imagine that there are no transformers. How many power plants do you think have to be set up in order to power up a city? It's not easy to set up a power plant. It is expensive. Numerous power plant have to be set up in order to have sufficient power.

Transformers help by amplifying the Transformer output stepping up or down the level of voltage or current. When the number of turns of the secondary coil is greater than that of primary coil, such a transformer is known as step up transformer. Likewise when the number of turns of coil of primary coil is greater than that of secondary transformer, such a transformer is known as step down transformer.

Transformer works on the principle of mutual induction of two coils or Faraday Law's Of Electromagnetic induction. When current in the primary coil is changed the flux linked to the secondary coil also changes. Consequently an EMF is induced in the secondary coil due to Faraday law's of electromagnetic induction.

The transformer is based on two principles: first, that an electric current can produce a magnetic field electromagnetism , and, second that a changing magnetic field within a coil of wire induces a voltage across the ends of the coil electromagnetic induction. Changing the current in the primary coil changes the magnetic flux that is developed.

The changing magnetic flux induces a voltage in the secondary coil. A simple transformer has a soft iron or silicon steel core and windings placed on it iron core. Both the core and the windings are insulated from each other. The winding connected to the main supply is called the primary and the winding connected to the load circuit is called the secondary.

Winding coil connected to higher voltage is known as high voltage winding while the winding connected to low voltage is known as low voltage winding. In case of a step up transformer, the primary coil winding is the low voltage winding, the number of turns of the windings of the secondary is more than that of the primary.

Vice versa for step down transformer. As explained earlier, EMF is induced only by variation of the magnitude of the flux. When the primary winding is connected to ac mains supply, a current flows through it.

Since the winding links with the core, current flowing through the winding will produce an alternating flux in the core. EMF is induced in the secondary coil since the alternating flux links the two windings. The frequency of the induced EMF is the same as that of the flux or the supplied voltage. Click image to enlarge Working of a TransformerBy so doing variation of flux energy is transferred from the primary coil to the secondary coil by means of electromagnetic induction without the change in the frequency of the voltage supplied to the transformer.

During the process, a self induced EMF is produced in the primary coil which opposes the applied voltage. Limitation of the TransformerTo understand the main points, we have to discuss some basic terms related to transformer operation. So lets back to basic for a while. A transformer is an AC machine that steps up or steps down an alternating voltage or current.

It sounds a bit weird though. You might be thinking "so are there not DC transformers? ElectromagnetismThe interaction between magnetic field and electric current is termed electromagnetism. Current carrying conductors produces magnetic field when current passes through it.

Movement of electrons in a conductor will result to electric current drifted electrons which occurs as a result of the EMF set up across the conductor. The EMF set up across the conductor can be in form of that stored in chemical energy or magnetic field. Current carrying conductor placed in a magnetic fields will experience mechanical force while a conductor placed in a magnetic field will have its electrons drifted which will results to electric current.

Field FluxTwo magnets of unlike poles will attract each other while magnets of like poles will repel each other so it is with electric charges. Every magnet is surrounded by a force field and is represented by imaginary lines emanating from the north pole of a magnet going into the south pole of the same magnet. Read the important terms related to Field Flux and Magnetic Filed with formulas Here "The lines linking the north and south pole of a magnet which represents force field which links coils in a transformer is termed as "The lines linking the north and south pole of a magnet which represents force field which links coils in a transformer is termed as "The lines linking the north and south pole of a magnet which represents force field which links coils in a transformer is termed as magnetic flux".

This phenomenon"electromagnetic induction"is explained by Faraday's laws of electromagnetic induction. In the course of his work he discovered that when there was change in a magnetic field in which a coil was placed, EMF was induced in the coil. This happened only whenever he moved either the coil or the magnet he used in the experiment. EMF was induced in the coil only when there was change in the field flux if the coil is fixed, moving the magnet towards or away from the coil causes EMF to be induced.

Thus Faraday's laws of electromagnetic induction states as follows; Faraday's First LawFaraday's first law of electromagnetic induction states that "EMF is induced in a coil when there is a change in the flux linking the coil". Faraday's Second LawFaraday's second law of electromagnetic induction states that "the magnitude of induced EMF in a coil is directly proportional to the rate of change of flux linking the coil".

In other words, When an E. F is induced in a circuit, the current setup always opposes the motion, or change in current, which produces it. OR An induced EMF will cause a current to flow in a close circuit in such a direction what its magnetic effect will oppose the change that produced it. According to this law which introduced by Lens in , the direction of current can be found.

Fleming's Right Hand RuleBelow are the more types of transformer derived via different functions and operation etc. Single Phase Transformer 2. Three Phase Transformer Types of Transformers w. Related Papers. Transformer Core. By Kenneth Agena. Testing and protection of transformer Seminar Guide Seminar Coordinator. By Ashraf Ali. By Rami Utsav. By Sushant Waghmare. By Chanisorn Limsutjakul.

## Transformer, Construction, Working, Types & Application - Electrical Technology.pdf

There are various types of transformer used in the electrical power system for different purposes, like generation, distribution and transmission and utilization of electrical power. The different types of transformer are Step up and Step down Transformer, Power Transformer, Distribution Transformer, Instrument transformer comprising current and Potential Transformer, Single phase and Three phase transformer, Auto transformer, etc. This type of transformer is categorized on the basis of a number of turns in the primary and secondary windings and the induced emf. Step-up transformer transforms a low voltage, high current AC into a high voltage, low current AC system In this type of transformer the number of turns in the secondary winding is greater than the number of turns in the primary winding. Step down transformer converts a high primary voltage associated with the low current into a low voltage, high current. With this type of transformer, the number of turns in the primary winding is greater than the number of turns in the secondary winding.

Most of the electronic circuits used in Circuitstoday. Therefore, it is important to know the working principle, construction and types of transformers used in different analog circuits. A transformer can be defined as a static device which helps in the transformation of electric power in one circuit to electric power of the same frequency in another circuit. The voltage can be raised or lowered in a circuit, but with a proportional increase or decrease in the current ratings. In this article we will be learning about Transformer basics and working principle. The main principle of operation of a transformer is mutual inductance between two circuits which is linked by a common magnetic flux.

## Introduction to Transformers

A variety of types of electrical transformer are made for different purposes. Despite their design differences, the various types employ the same basic principle as discovered in by Michael Faraday , and share several key functional parts. This is the most common type of transformer, widely used in electric power transmission and appliances to convert mains voltage to low voltage to power electronic devices. They are available in power ratings ranging from mW to MW. The insulated laminations minimizes eddy current losses in the iron core.

A Transformer is an electrical device that can be used to transfer the power from one circuit and another circuit without physical contact and without changing its characteristics like frequency, phase. It is an essential device in every electrical network circuitry. It consists of majorly two circuits, namely primary circuits and one or more secondary circuits. In this discussion, we deal with different types of transformers. The mutual induction phenomenon between two or more winding is responsible for power transformation.

A transformer is a widely used device in the electrical and electronics domain. It is an electromagnetic device which follows the basic principle of electromagnetism discovered by Michael Faraday. We have covered about Transformers construction and operation in detail in previous tutorial. Here we will cover different types of transformers used in different types of applications. However, all types of transformers follow the same principles but they have different construction method.

### Various types of transformers.pdf

WEG applies its own technology, totally developed and maintained by its experienced technical staff. There are over 50 engineers and technicians perma- nently involved in product research and development and new project conceptions, with the objective of supplying our customers with reliable, high efficiency and long lasting products. Because of this unique en- vironment, the most modern technical concepts and computational tools available on the market and also developed internally are used, along with the extensive and proven experience of the technical team. They not only consider the The assembly of the active part is done in a controlled atmosphere through a ventilation and refrigeration system with filtered air insufflation. This process not only ensures a shorter delivery time but the perfect dryness leads to enhanced life of the transformers. All of the parts are appropriately coated with paints that have been produced also by WEGs companies Designed following the most modern concepts of high voltage technology available, in the testing laboratories all transformers and reactors are subjected to the routine tests and mesurements specified and in accordance with IEC and ANSI specifications.

A transformer is a passive electrical device used to transfer electrical energy from one circuit to another, via the phenomenon of electromagnetic induction. The primary and secondary coils both have winding turns which will vary in number with respect to each other depending on the type of transformer see below :. This means that a voltage increase in one circuit must result in a proportional decrease in current and vice versa. In the high-voltage circuit of the X-ray generator, step-up transformers are used to convert the mains voltage - V to the high voltages 20, - , V required for x -ray production. In the filament circuit of the X-ray generator, step-down transformers are used to increase the heating current applied to the filaments of the cathode for thermionic emission.

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identify the common types of transformers from their schematic diagrams. properly ground a transformer, and the secondary electrical system produced by the.

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