Please help me to find out the exact losses of current when "three phase system, 400metre length,carrying 220v"?
closed as not a real question by Olin Lathrop, stevenvh, Brian Carlton, W5VO♦ Aug 24 '12 at 16:32
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.
Your question makes little sense because current is the one thing that is NOT lost by a long transmission line. Basically, the electrons that go in one end have to come out the other end. The cable will have a finite resistance, and that times the current will be the voltage drop from one end to the other. The voltage drop times the current is also the power lost in the cable.
Without more specifics I can't do more than provide the general information above.