A better name for what is currently called a transformer in this mod would be a "Low/High Power Variable Frequency Drive" as that is the name of the device used for most motor control when using a large DC storage (batteries) to power given set of motors.
I would also recommend using power over voltage in the description of the device as you can have high voltage but be unable to lift a feather with it or you can have low voltage but lift tons what matter more is the power (ability to do work). In factorio terms voltage is akin to you telling me that you have 500 C steam from a heat exchanger (nuclear) or 165 C steam from the boiler but not telling me how many turbines/steam engines you have, where as power is you telling how much wattage your base uses but not telling me what generators you are using.
