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Please help me to find out the exact losses of current when "three phase system, 400metre length,carrying 220v"?

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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, visit the help center. If this question can be reworded to fit the rules in the help center, please edit the question.

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    \$\begingroup\$ You need to know the wire material and cross-section to calculate resistive losses. \$\endgroup\$ – sharptooth Aug 24 '12 at 9:34
  • \$\begingroup\$ ... and even more information about the cable to calculate its impedance. \$\endgroup\$ – JimmyB Aug 24 '12 at 12:29
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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.

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  • \$\begingroup\$ Indeed, loss of current makes little sense, but current loss could indicate the power loss due to the current in the wire, as you say. That is opposed to leakage loss, that depends on voltage and insulation. \$\endgroup\$ – clabacchio Aug 24 '12 at 13:18

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