All transformers are AC only. You are confusing it with a hall current sensor, which are usually
If you go the route of voltage divider for high voltage DC sensor you need to know about
resistor voltage ratings, using multiple resistors in series (no single point of failure), potting
up of circuits and flash-over. Once you are in the kV range with significant power you
absolutely above all else have to avoid any possibility of flash-over, because that will destroy
everything and risk lethal electrical shocks and fires.
Finding a commercial high voltage divider probe that's appropriately rated as the basis of
a voltage sensing circuit makes sense - the manufacturer knows high voltage and gets it
DC is more dangerous than AC for the same voltage as it is significantly harder to switch
off (standard AC mains fuses will not work reliably on DC for instance). 1kV DC at high
power can hold a surprisingly long arc, perhaps 2 to 10cm. Unless you understand the
hazards of HVDC, think carefully about such issues, and ensure you have correctly rated
connectors and equipment.
I never studied in the field of electronics so I have limited understanding on the subject, but if I understand correctly measuring on the AC side would only inform me on apparent power (VA) and not true power (W)?
That is an issue that I would not have when measuring on the DC side, correct?
No, since you are rectifying into a resistive load you know the power factor is 1, so you
can measure on the AC side. If the load was capacitive or inductive you'd need to know
phase relationship to measure power.
However with rectification you have to correct the AC amplitude to allow for the conduction
angle of the rectifier, so actually a true RMS measurement is useful to avoid doing that