4160VAC transformers should be reversible to use as plate transformers. Like a pole transformer is done. I use old reversed 3KVA step down pole transformers for step up to plate voltage and they are fine, do not even get warm.
These are not mine. I have no experience with these.
750 VA, 4160V 240V
http://www.ebay.com/itm/280991635094750 VA PRI: 4160/2400V (4160VCT) SEC 120V
http://www.ebay.com/itm/3014046359282 KVA 4160 - 115/230 1 Phase
http://www.ebay.com/itm/2718704888982 KVA SINGLE PHASE PRI 4160V SEC 115/230V
http://www.ebay.com/itm/3214662071343KVA 1PH 4160V-AC 115V/230-AC
http://www.ebay.com/itm/2914817215904160V 3KVA single phase 120/240
http://www.ebay.com/itm/3812814520914160V 3KVA single phase 115/230
http://www.ebay.com/itm/3812814510043KVA 1PH 4160V-AC 115/230V
www.ebay.com/itm/38128141436215kVA 1PH 4160:120/240V
http://www.ebay.com/itm/35141321126415kVA 1PH 4160:120/240V
http://www.ebay.com/itm/271884799396
