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Transformer Basic :

Transformers square measure electrical devices consisting of 2 or a lot of coils of wire accustomed transfer voltage by means that of a dynamic flux. one amongst the most reasons that we tend to use alternating AC voltages and currents in our homes and workplace’s is that AC provides is simply generated at a convenient voltage, remodeled into abundant higher voltages so distributed around the country employing a national grid of pylons and cables over terribly long distances.

The Voltage electrical device is thought of as AN electrical part instead of AN electronic part. An electrical device essentially could be a terribly straightforward static electro-magnetic passive device that works on the principle of Faraday’s law of induction by changing voltage from one price to a different. Transformers square measure capable of either increasing or decreasing the voltage and current levels of their offer, while not modifying its frequency or the quantity of electric power is transferred from one winding to a different via the magnetic circuit.

A single-phase voltage electrical device primarily consists of 2 electrical coils of wire, one known as the “Primary Winding” and another known as the “Secondary Winding”. For this tutorial, we are going to outline the “primary” facet of the electrical device because of the fact that sometimes takes power and therefore the “secondary” because of the fact that sometimes delivers power. during a single-phase voltage electrical device the first is typically the facet with the upper voltage. These 2 coils don’t seem to be in tangency with one another however square measure instead wrapped along around a standard closed magnetic iron circuit known as the “core”. This soft iron core isn’t solid however created from individual laminations connected along to assist scale back the core’s losses. The two coil windings square measure electrically isolated from one another however square measure magnetically coupled through the common core permitting wattage to be transferred from one coil to the opposite. once an electrical current underwent the first winding, a flux is developed that induces a voltage into the coil as shown.

Transformer Action :

We have seen that the amount of coil activates the secondary coil compared to the first winding, the turns magnitude relation affects the number of voltage on the market from the coil.


A voltage is connected to coil L1. Here we have a voltage connected to the coil. What we tend to ar gazing here is that the constant of coupling. currently, the voltage connecting here desires to induce a voltage in L2. however if you may notice, L2 is de facto outside the vary of the flux of L1. The meter here is showing zero volts as a result of it merely is not shut enough. The constant of coupling here would be a pleasant zero. within the lower image notice, the L2 coil is nearer to L1 and inside the magnetic flux. Therefore, voltage is evoked into L2 and it’s displayed on the meter. Here the L2 is in abundant nearer proximity to L1 then we tend to see a voltage.

Then we will see that identical voltage is elicited in every coil flip of each winding as a result of identical magnetic flux links the turns of each the windings along. As a result, the full elicited voltage in every winding is directly proportional to the number of turns therein winding. However, the height amplitude of the output voltage offered on the secondary coil is reduced if the magnetic losses of the core area unit high. If we would like the first coil to provide a stronger flux to beat the cores magnetic losses, we will either send a bigger current through the coil, or keep the identical current flowing, and instead increase the number of coil turns ( NP ) of the winding. the merchandise of amperes times turns is named the “ampere-turns”, that determines the magnetizing force of the coil.

So forward we have an electrical device with one flip within the primary, and only 1 flip within the secondary. If one V is applied to the one flip of the first coil, forward no losses, enough current should flow and enough magnetic flux generated to induce one V within the single flip of the secondary. That is, every winding supports an identical variety of volts per flip.

Transformer Turns ratio :

Transformer Turns ratio

Types of Transformer :

There square measure varied varieties of an electrical device utilized in the power system for various functions, like generation, distribution and transmission and utilization of power. the various varieties of electrical device square measure intensify and Stepdown electrical device, Power electrical device, Distribution electrical device, Instrument electrical device comprising current and Potential electrical device, Single-section and 3 section electrical device, Autotransformer, etc.


Transformers based on the place of use :


These area units classified as indoor and outside transformers. Indoor transformers area unit coated with a correct roof like as within the method trade. The outside transformers area unit distribution kind that area unit placed in substations etc.

Auto Transformer :


Normal transformers have 2 windings placed on 2 completely different sides i.e. primary Associate in Nursing secondary however in an autotransformer, each the windings that area unit primary and secondary windings area unit connected to every alternative each physically and magnetically. there’s one common winding that forms each primary and secondary coil within which the voltage is varied by ever-changing the position of secondary sound on the body of the coil.

Air Core Transformer :


The primary and secondary windings wound on a non-magnetic strip wherever the flux linkage between primary and secondary is thru the air. The coefficient of mutual induction impact is a smaller amount in air-core compared to iron core i.e. the reluctance offered to the generated flux is high within the air medium whereas within the iron core it’s less. however the physical phenomenon and eddy current losses that area unit dominant in iron core kind area unit less or utterly eliminated in an air-core kind electrical device.

Iron Core Transformer :


The two windings area unit wounded on iron plates which offer an ideal linkage path to the generated flux. because of the conductive or magnetic property of the iron, it offers less reluctance to the linkage flux. This area unit wide used electrical devices within which is effective are high compared to air core sort transformer.

Power Transformer :


The power transformers area unit massive in size and used for prime power transfer applications, wherever the transmission voltage is bigger than 33KV. It utilized in generating station and Transmission station .high insulation level.

Distribution Transformer :


It is used for the distribution of voltage at low voltage as but 33KV in industrial purpose and 440v-220v in domestic purpose. It works at low potency at 50-70%, small size, straightforward in installation, having low magnetic losses not perpetually totally loaded.

Measurement Transformer :


These are wont to measure some electrical amount like voltage, current etc. As their name specifies these area unit classified as potential transformers, current transformers etc.

Protection transformers :

These sorts of transformers area unit utilized in part protections. the most important distinction between measurement and protection transformers is that the accuracy i.e. the protection transformers ought to be a lot of correct compared to measurement transformers.