Friday, 12 October 2018

components - Dots in a transformer symbol


I came across this schematic:


enter image description here


What do the dots in the transformer indicate?




Answer



Those are phase dots. They refer to the 'start' of the winding based on a predetermined winding direction (CW or CCW). This allows you to tell at a glance what 'polarity' the windings have so you can figure out how the current will flow.


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