If you search the internet for “transformer equivalent circuits,” you’ll get five pages of over 100 small circuit diagrams ... when modeling inductive voltage dividers (IVDs) or transformer ...

It’s an easy to build high voltage power supply that interfaces ... [Andrew Moser] added a new primary coil to the transformer. This boosts 12 volts that can be easily controlled by an Arduino ...

Tap changers are devices that can increase or decrease the output secondary voltage by changing the turn ratio of primary or secondary winding. A tap changer is usually installed on a high voltage ...