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In an autotransformer, the common portion of the single winding acts as part of both the “primary” and “secondary” windings. The remaining. Electrical Tutorial about the Autotransformer and the Variable Auto The main advantage of this type of transformer design is that it can be made a lot cheaper for the same VA rating, but the biggest disadvantage of an autotransformer is that it. An autotransformer is an electrical transformer with only one winding. The “auto” ( Greek for and cheaper than 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.

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The transfer of power between two circuits connected to an autotransformer aadvantages through two phenomena: Likewise, a transformer increases its capacity to transfer power when connected as an autotransformer. If an alternating voltage is applied between points C disavdantages D, and the output voltage is measured between points A and B, the autotransformer is said to be a voltage booster. The operating principle is the same as that of the common transformer, so the transformation ratio between voltages and currents and the number returned is maintained.

Auto Transformer

The primary and secondary currents are in opposition and the total current flowing through the coils in common is equal to the difference of the current of the low voltage winding and the high voltage winding. It has a single coil wound on the advantxges, but has four terminals, two for each circuit, and therefore has points in common with the transformer.


It consists of a winding of ends A and D, which has been made a derivation in the intermediate point B. For now we will call primary to the complete section AD and secondary to the portion BD, but in practice it can be the other way round, when you want to raise the primary tension.

The voltage of the primary network, to which the autotransformer will be connected, is V1, applied to points Adfantages and Dusadvantages.

We call the total current of vacuum I0, as we have done in other opportunities. There are autotransformers with several sockets in the secondary and therefore, with several transformation ratios.

In the same way as transformers, autotransformers can also be equipped with automatic tap changers and used in transmission and distribution systems to regulate the voltage of the electric advntages.

There are also autotransformers in which the secondary intake is achieved through a sliding brush, allowing a continuous range of secondary voltages ranging from zero to the voltage of the source.

This last design was commercialized in the United States under the generic name of Variac and in practice it works as a source of alternating current in tension.

In this way we have a more effective AC machine. This situation must be taken into account when deciding to use an autotransformer for a certain application.


disadvantagrs For higher voltage ratios, either the conventional two-winding transformer is more compact and economical, or it is impossible to build the autotransformer. The advantages and disadvantages of autotransformers will be explained below. In short, we say that there is a wide range of advantages of autotransformers.

There are very important applications for the operation of other machines that require autotransformers. In this investigation we conclude with the points mentioned above in which we find a wide range of advantages of the autortansformer and disadvantages explain the operation and how the autotransformer operates if we say that the autotransformer is characterized by the others by having a single winding.

Auto-Transformers Advantages Disadvantages | Electrical Interview Questions & Answers

Elsewhere we say that autotransformers offer applications such as railway systems, squirrel-cage motor starters and the rural distribution system. Sign me up for the newsletter! Leave this field empty. Improving your life knowledge health and family. See more Previous article Advantages and disadvantages of the main types of irrigation Next article Transational Leadership versus Transformational Leadership. Leave a Reply Cancel reply. Advertisements fund this website.

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