Auto Transformers
An autotransformer is an electrical transformer with only one winding. In an autotransformer, portions of the same winding act as both the primary and secondary sides of the transformer. In contrast, an ordinary transformer has separate primary and secondary windings which are not electrically connected. An autotransformer does not provide electrical isolation between its windings as an ordinary transformer does.
Since part of the winding does “double duty”, autotransformers have the advantages of often being smaller, lighter, and cheaper than the typical dual-winding transformers, but the disadvantage of not providing electrical isolation between primary and secondary circuits. Other advantages of autotransformers include lower leakage reactance, lower losses, and lower excitation current.
The schematic of a Single Phase Auto Transformer is shown below:
Auto transformers are a type of electrical transformer that has a single winding divided into two or more sections, which serves both as the primary and secondary winding. Unlike traditional transformers, which have separate primary and secondary windings, auto transformers use a common winding for both input and output.
Key Features:
Single Winding: An auto transformer has one continuous winding that acts as both the primary and secondary, which makes them more compact and lighter than conventional transformers.
Voltage Regulation: By tapping into different points of the winding, an auto transformer can provide various voltage outputs, making them suitable for applications requiring voltage adjustment.
Efficiency: Because of their design, auto transformers generally have higher efficiency and lower losses due to the reduced amount of copper and core material required.
Common Usage: They are commonly used in applications like voltage regulation, in power systems for matching transmission voltages, and for providing lower voltage to equipment in industrial settings.
Applications:
Power Distribution: Auto transformers are often employed in electrical grids and substations for voltage conversion and stabilization.
Motor Starting: They can reduce starting current in motors by providing a lower initial voltage.
Voltage Conversion: Often used in applications such as step-up or step-down transformers for various electrical equipment and appliances.
Safety Considerations:
While auto transformers are efficient, they do not provide electrical isolation between their primary and secondary circuits. This means that if a fault occurs, high voltages can be present at the lower voltage side, posing safety risks. Hence, they are used cautiously in applications where isolation is not a requirement.
Overall, auto transformers are versatile and efficient devices, ideal for specific applications where space, weight, and cost are critical factors.
We can build auto transformers from 0.1 KVA to 5 MVA, please call us at 714-624-4740 or email us at quote@lcmagnetics.com
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