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The "n" stands for the neutral being brought out of the transformer tank and being available for current measurement or for being earthed. If "n" is absent from DYn11 that means it is an isolated neutral Delta-wye Xmer

Megavars are the magnetising component of the total power (MVA) which is required to maintain the magnetic fields of generators/motors/transformers in an electric system.It denotes the inductive(or capacitive) characteristics of any load in a system. Thus mvar=((mva*mva)-(mw*mw))1/2

First , a 200/1-1A CT cannot be used as a 400 A one as the excess primary current causes heating in the cores. Second connecting the secondaries can never give you a different ratio. You can instead use a ICT (interposing CT) of ratio 1/0.5 to get a ratio of 400/1 from the same ct.Be sure to...