Uses of Transformer

Practical Transformer

When current is transferred from one circuit to another without any physical contact between the circuit then we use a practical transformer. It also does not allow to change the phase and the frequency. Depending on the type there are various uses of a transformer. The transfer of electricity from one circuit to another through the electromagnetic induction process is known as a practical transformer. It is used to increase and decrease the voltage in the circuit. The increase in voltage is called “step up” and a decrease in voltage is called the “step down” method. A transformer that increases the voltage between primary and secondary winding is called a step-up transformer and that decreased voltage is called a step-down transformer.


Transformer Parts and Construction

The transformer has three main parts:

  • Transformer Primary winding

  • Transformer magnetic core.

  • Transformer Secondary winding.

Transformer Primary Winding: 

When it is connected to an electrical pole it produces electric flux.


Transformer Magnetic Core: 

A close circuit will be formed when the reductant path will be linked with the secondary winding. The magnetic flux produced by the primary winding that will flow through this reductant path creates a magnetic chore.


Transformer Secondary Winding: 

The flux passes through the core that is linked with the secondary winding. The flux is produced by the primary winding. On the core, the wound is done with the same flux and gives the output of the transformer.

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Application and Uses of Transformer


Power Transformers: 

The transformers which are used for high voltage power transfer applications (more than 33 Kilovolt) are called Power Transformer. They are usually very big. They can occupy a wide area of space.


Distribution Transformers: 

The transformers which are used to distribute the generated power to distant locations is called distribution transformer. At a low voltage, it is used for distributing electricity that is less than 33 Kilovolt in industry. It also distributes 220-440 V for household purposes.


Measurement Transformers: 

The transformer which helps in measuring voltage, current, and power, etc. is called a Measurement transformer.


Transformers are classified according to the place of use, are as follows:

Indoor Transformers: 

The transformer that is covered with roofs and shelters just like the industry types is called an indoor transformer.


Outdoor Transformers: 

The transformer that is mainly kept outside and is used as distribution type transformers are called an outdoor transformer.


Solved Answers


1. What is the Working Principle of a Transformer?

Ans: The transformer’s working principle is very easy. Electrical energy is allowed to flow due to the mutual induction between the two windings which is transferred between two circuits. 


2. Write Two Applications of the Transformer?

Ans: Two applications of transformer:

  • Switching application is one of the core uses of a transistor.

  • High current switching can be done with the help of the Avalanche transistor.

  • The greater current flows from emitter to collector with the help of a Bipolar Junction Transistor(BJT).

3. What is the Transformer Inrush Current?

Ans: The transformer inrush current is the current that initially passes through the transformer when it is switched on. 


4. What is the Purpose of the Transformer Core?

Ans: A low reluctance path is produced. The maximum flux is produced by the primary winding when it is linked with the secondary winding. 


5. What are Step-up Transformers and Step-down Transformers?

Ans: The transformer that increases the voltage between primary and secondary winding is called a step-up transformer. The transformer that decreases the voltage between the primary and secondary winding is called a step-down transformer.


6. How Does a Transformer Work?

Ans: Two coils are present in the transformer. Alternating flux in the core is produced, if a coil is connected with an Alternating current supply. In the second coil, mutually induced emf is produced since most of the coil is connected with it. This is due to faraday’s electromagnetic induction.


7. Can We Apply Direct Current to the Transformer?

Ans: No.

We use faraday’s law of electromagnetic induction in the case of the transformer for which the current in the coil must be present. The transformer will not work as the Direct current applied will not change the current in the coil. When Dc inductive resistance and frequency are zero in case of direct current. Thus winding draws more current which may damage the transformer. 


8. What is a Single and Three-phase Transformer?

Ans: Single phase transformer is a transformer that works with a single phase. A three-phase transformer is a transformer that works with three phases.


9. Define Auto-transformer.

Ans: In both primary and secondary we use only one winding. These windings are magnetically coupled.


10. Define a Three Winding Transformer.

Ans: We use three windings in primary and secondary coils. They have three phases and are called a three-phase transformer. They are conductively coupled. Hence called Three-phase autotransformer. 

FAQs (Frequently Asked Questions)

1. What is the Material Used for the Core Construction of the Transformer?

Ans: To provide a continuous magnetic path with a minimum air gap included, the core is assembled and constructed with a sheet steel lamination. The steel which is used is made of high silicon content. Sometimes high permeability is caused due to treating it with high heat. At the usual opening flux densities, low hysteresis is caused. By laminating the core eddy current loss is minimized. A light coat of core plate varnish is done on it or by the oxide layer of the surface the lamination is done. 0.35mm for a frequency of 50Hz and 0.5mm for a frequency of 25Hz is the thickness of lamination.

2. What is a Transformer Used for?

Ans: The transfer of electricity from one circuit to another through the electromagnetic induction process is known as a practical transformer. A varying current is produced in the transformer’s core due to the magnetic flux. This produces electromagnetic forces across any coil. Electric current can flow between any two coils without any connection between them. To low the alternating current voltages at the high current or decreasing the low alternating voltages at high current transformers is used. For coupling the stages of signal processing circuits and in electric power applications transformers are used. The transformer can also be used for isolation.