Variac, Auto-, Vario- and Isolation Transformers – Isolation, Day 28

I give a short introduction to the differences between autotransformers, variable autotransformers and variable transformers. I show my collection of 7 variac transformer / variotransformer in the range from 1x260V @ 2A to 3x400V @ 25A along with a 3x400V 10kVA isolation transformer.

3x400V @ 13A Variac demonstration with data monitor:

You might wonder what is a variac, it is a brand name of autotransformers. Autotransformers are not galvanic isolating between a primary and secondary coil. The autotransformer is a single coil transformer, where the midpoint can be adjusted and thus vary the output voltage. Some known brands are Powerstat variable autotransformer and autotransformador.

Mads Barnkob

Electrician, programmer, experimenter and amateur scientist with experience in industry automation, programming and all kinds of high voltage generating electronics. Administrator of and the high voltage community forum

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