An autotransformer is a kind of electrical transformer that features a single-winding( usually a copper wire) that acts as both primary and secondary winding sides of the transformer. They are different from regular isolation transformers where the wire loops are kept completely isolated. These electrical equipment are based on a unique single-phase winding concept “ Auto” where

the primary and secondary windings are directly connected internally forming a continuous winding. Therefore; in this blog, we will explain the working principle of auto transformer, making it easy to understand. I am sure by the end, you will have a clear picture of the role along with its core concepts. 

Foreground of the Content-The article will break down the key concepts of the autotransformer’s work. Moreover, the article will highlight concise information about its types, its major role in electrical systems, and its advantages.

Autotransformer and Types-

As we know, in simple terms, an autotransformer is a type of single-coil wound electrical system to achieve voltage applications to the device. The most simplified constructions provide the desired output without undergoing a magnetic coupling effect. These trending electrical appliances are classified into various categories based on factors like core material used, construction, application, cooling system, and type of supply. 

 

• • Based on Construction- Core- type, and Shell- type. 

• • Based on the transformer ratio- Step- up and Step- Down.

• • Based on Core Material- Iron core, ferrite core, air core.

• • Based on Application- Power, distribution, and Instrument.

• • Based on the Colling System- Dry- type and oil-immersed.

• • Based on the Type of Supply– Single-phase and three-phase transformer.

Advantages of Autotransformers-

The static device that transfers electrical power from one circuit to another with a common lead to both the input and output sides of the transformer demonstrates several benefits.

 

• • Having one winding on the laminated core, autotransformers allow greater input or output current. 

• • The electrical device has high efficiency with less maintenance requirements. 

• • These single-winding designs are used for high-power applications.

• •  It reduces the computational complexity that enables better performance on sequence-to-sequence and neural machine translation tasks(NMT). 

• • Moreover, these electrical appliances are promising alternatives to efficiency for long-range dependencies and traditional transformer models.

Applications of Auto Transformers-

The cost-effective static device based on shared winding arrangements is widely used in Natural Language Processing( NLP) and speech recognition tasks(converting spoken language into machine-readable format). 

 

• • These special equipment are used in high-power applications to connect with different voltage levels( Higher voltage to lower- voltage link). 

• • They are used in large motors above 30kW ratings.

• • In rural power distribution lines, tap-changing equipment is inserted to receive the same average voltage at the far end of the line.

• • Tapped autotransformers are used in audio applications to match the impedance levels ensuring high-quality sound production.

• • They are used in railways to reduce induced interference with external equipment. 

Future Trends in Auto Transformers-

These special types of electrical devices are undergoing a transformative phase of growth in today’s burgeoning market. There is a substantial rise in the growing preference of the transformers which in turn drives the market expansion. Moreover, the rising need for electrification is shaping the demand for motors starting from auto-transformer products. Moreover, there is steady growth for auto transformers because the market is propelled by renewable energy sources. Thus we say that sustainable energy is fueling the new trends of autotransformers. 
In the next segment, we will break down the working principle of auto transformer in simple terms and provide a clear understanding of how it functions.

Working Principle of Auto Transformer

Autotransformers are the same as ordinary transformers except the primary and secondary coil influences themselves to generate the voltage. These sides of the autotransformers have direct electrical connections.

Point to Remember– The autotransformer does not work as a traditional voltage regulator instead it operates in both set-up and set-down configuration. In a set-up-down transformer, the portion of the winding is used as the secondary winding whereas the segment of the winding receives the input voltage. In a single-winding transformer, the secondary winding is an important part of the primary winding.

Working Principle of Auto Transformer-

The primary and secondary winding is called common winding and the rest of the autotransformer is known as the series winding. Now is the time to understand the unique construction and working principle of autotransformer

below.

 

• • These single-winding equipment are also known as variac transformers that have two or more coils in a closed iron core. When the primary coil is connected to an alternating power supply an alternating magnetic field is generated within the iron core. The induced EMF( electromotive force) is produced in the secondary coil through this mutual induction process.  

• • Voltage conversions are achieved by altering the typical turns ratio between both the coils( primary and secondary coils) ranging from 1.5: 1 to 2:1. The magnitude of induced secondary coil EMF is calculated on the number( quantity) of turns in the secondary winding.

• • The ratio of primary and secondary winding emf is E1/ E2= N1/ N2= k. 

• • If turns are fewer, it is known as a step- down whereas if several turns are greater it is called a step-up. 

Hence; we can say that its lower cost, small size, and lightweight features make them a trending choice in modern applications. Moreover, I hope the article summarizes the working principle of autotransformer and why it has established itself as a valuable electrical component in simple terms.

Largest Manufacturers of Auto Transformers

Laxmi Associates based out in Vadodara is a prominent name for power solutions ranging from Extra high voltage( EHV) to Low voltage( LV) electrical apparatus. The leading manufacturer holds a significant name in the entire lifecycle of electrical infrastructure. Having strong progress in Vadodara, the company maintains a strong presence in both substation services like Gas- gas-insulated substation ( GIS) and Air- Insulated Substation( AIS) up to 765kV(kilovolts). Their commitment to quality addresses the power sector’s complex needs. Moreover, for the last 5 years, Laxmi Associates has been recognized as the pre-imminent name in Autotransformers manufacturers, suppliers, and exporters in the national market. They have gained consistent recognition for delivering best-in-class products at the competitive market price. 

Hence; for further assistance, get in touch with our experts who excel as top exporters in this sector.