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Thanks for the advice guys, very useful.

The CTs are 40VA, 7500/A, Class 1. Ammeter is Class 1.5

It is a three wire system with no neutral. Using summation for the third phase is this more accurate than actually measuring it?

I am discussing with a colleague the measurement of three phase current in a distribution network. The contractor is proposing using two current transformers and the outputs passed via a 3 pos selector switch & panel meter to show the current in the system. I argue that for accuracy there should...

We specified a 125KVA 440V/220V transformer at 60Hz. It has arrived however at 50 Hz. I know the change in frequency will alter the reactance therefore the impedance, with the net result being a change in current. Will this change the flux by to large a margin and harm the windings? Or can I use...