I have a brief to design and build a HV test truck with the following specs:
AC 75kv @100mA, 35kV@400mA DC 40kV@400mA, (-20kV)-0-(+20kV) @ 400mA also 300vac @ 30 amps for induced testing of 415/11kV transformers variable (from the regulator) my head is spinning at the possibities. I think that it'd be elegant to use 1 transformer with 2 secondaries. i could utilise the fact that both 240v and 415v @ 63amperes are available for the source supply. I am considering utilising a doubler circuit for the split supply DC supply as well as for the single ended DC supply by just moving the earth point. Mind you for the 75KVac I'd need to get a high volts transformer anyway so maybe a full wave rectified with centre tap?. 1 of the problems that I'm having is calculating the primary VA's for secondary VA's for various rectifier (& doubler) circuit dc outputs. It seems that there are cost benifits/penalties if there is a dc flux component thus needing more core iron to avoid saturation (but how much??) and likewise if both ends of the winding need to be insulated for HV rather than just one(also...how much??). I'd sure appreciate a bit of wisdom on how to approach this.
many thx in advance