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What is the (angle) relation between line current and phase current in a delta connection? and does the line current direction make any difference in this relation? I mean, Line current flowing in- Line current flowing out.

Does the zero sequence current flow on the Y connected winding of the XFR?

is there on the NEC (the part we are usually tested on) a requirement to go for the (next lower level) on the overcurrent protection (overload, ground fault and short circuit) for conductors and motors? (branch circuit, feeders). All I have seen is (next upper level)

Is the solution for this problem correct?

The total loss at full load of a single phase transformer is estimated to be 2000 W. The transformer maximum efficiency occurs at 45% of the full load. The estimated no load loss of the transformer is approximately?

This post is to discuss about the differential protection on 3 phases transformer. specifically, star delta connection. I think it is a rich topic in the concepts and might well appear on the PE How to connect CTs, 30 degrees phase shift, instantaneous currents, zero sequence currents, triple...

I am posting this problem since I usually get it wrong first time. this post will help me remember not to make the same mistake always. Try it, A single phase 100 kVA, 4.6/0.480 kV transformer no-load loss is measured to be 300 W. The total loss at 75% loading is measured at 1200 W...

Hi all, just a quick one, for a 3 phase system, we have V line and total reactive power consumed by the system Q. then capacitive reactance Xc = V line**2/Q  or sqrt(3)*V line**2/Q ? I am confused.