Auto Transformer

For starting induction synchronous motors several methods are used.
Auto transformer. They help offer voltage law to big power lines. A variable autotransformer also known as variac which has continuous variable output voltage is used in the laboratories. It is connected in the form of zigzag or t connected transformers.
Therefore it is economical for the same va rating as windings are reduced but the disadvantage is that it does not have isolation between primary and secondary windings. An autotransformer is an electrical transformer with only one winding. Is the one which consists of a single winding part of which acts as the primary winding of the transformer and some part of which acts the.
A break in the common winding of the autotransformer will result in full input voltage at the load. Secondary winding which can be varied by switching between the contacts of the transformer. Auto transformer an auto transformer is a transformer with only one winding wound on a laminated core.
Auto transformer an. The auto transformer does have one drawback. We know that the transformer includes two windings namely primary and secondary which are connected magnetically but insulated electrically.
A part of the winding is common to both primary and secondary sides. The auto prefix refers to the single coil acting alone greek for self not to any automatic mechanism. These transformers have continues of phase and neutral current rating.
In an autotransformer portions of the same winding act as both the primary winding and secondary winding sides of the transformer. Autotransformers are lighter smaller cheaper comparing with other transformers but they will not provide electrical isolation between two windings. Auto transformer earthling or grounding.