Sir, In our 110kv substation we using P154 o/c & e/f numerical relay on 11 kv feeders. When feeder tripped on e/f we get some data from relay like, Ia=316A, Ib=972A, Ic=373A, In1=869A, In2=896A, I2=280A, I1=371A, I2/I1=0.75.what does it each notations mean. I hope clarify my doubt . Thank you
@rajeshtk1246
2 жыл бұрын
Those current values are the currents that were flowing during the fault. Ia, Ib & Ic are pretty obvious.. phase current values. In1 & In2 are measured by EF element and derived earth fault current calculated from 3 independent phase current values. I1 is positive seq. component, I2 is negative sequence component (Which is an indicator of the fault).
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