First, I am a retired electrical engineer for a major government contractor. There is no such thing as a DC transformer. There are DC voltage and current sensors that can provide a signal or a AC to DC power supply. In order to get voltage through a transformer you need AC, alternating current. Tesla (AC) vs Edison (DC) for transmitting power. Tesla beat Edison do the the efficient transmission of AC current through increasing the voltage through transformers and then reducing the voltage at the receiving end. That is how it is still done.
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