Answer Posted / alok singh

MY Bro Pradeep kumar who tells you that Dc is not harmfull , The railway traction system supply is completely dc transmission, even though all the high tension transmission is done using dc supply, the actual reason is that in ac once when its cycle comes to zero u get a chance to be left from shock but in d.c once u get shock u wont as it has only positive cycle.

we have require a Motor (1500kW, 6.6kV, 50Hz) which shall operate at 1500rpm during 30min and after it shall run on 500rpm during 15min. The same cycle shall be repetitive during the whole working days. Which method is best and economic to achieve such type of task. VFD, VVFD, Pole changing motor etc.

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