Kindly Send us your last NO REGRET Offer latest by 30th July 2014.of control transformers as per below specification for NTPC Project :-
415V AC / 42V AC 3Phase 4Wire, Dry Type Natural air Cooled with Class ‘F’ insulation Impedance of trf. shall be tested IS: 11171 off-circuit tap changer with +/-5% in steps of +/- 1.25% tapping shall be provided .