WE have 400V AC 3 phase supply. We need to have several 380V DC Battery Charginging Circuits each of 50A,DC. One Panel to have 4 such circuits. Can we avoid the transformer totally since difference in peak voltages is low? With removal of transformer, will the energy efficiency improve? With 6 pulse SCR circuits what protection is needed ? What are other possibilities, so that transformer is avoided in the panel. Charging DC voltage can varry from 300V DC to 380V DC. Possibility of short circuit is there and also programmed stepped charging including discharge back to mains.