Dimmerstat

Dimmerstat is an auto transformer which is generally connected to supply which provide us step up step down output depending on the terminal to which input is connected. Normally there are two ways to operate a Dimmer stat:-
1. The output voltage can be varied from 0 to full supply voltage.
2. Voltage from 0 to 12 % higher than supply voltage
An Autotransformerauto step down transformer 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.The winding has at least three taps where electrical connections are made. Autotransformers have the advantages of often being smaller, lighter, and cheaper than typical dual-winding transformers, but the disadvantage of not providing electrical isolation. Other advantages of autotransformers include lower leakage reactance, lower losses, lower excitation current, and increased KVA rating
Variable autotransformers