Recent content by RBsai

thanks

Can someone please post the answers to the above spinup questions. I am using an old version.

Its usually on the left hand side rating of the xfmr.

Does it mean I1/Ip = CT ratio ? (Where I1 - relay pickup setting, Ip is primary current) and what about PTs ?

Whats the relation between relay pickup setting and turns ratio for CTs and PTs ? (With reference to CI 2#15 old version)

Thanks

Can anyone explain me why ncees soln considered the drop at the panel as phase instead of line ?? I am getting 475V as an answer. Z= 0.00725+0.0120j Voltage drop at the panel = 480 - IZ(drop)

Its a single phase, we have to consider return path also (IZ Drop multiplied by 2)

i am getting 117.3 volts.

Some of the options to NCEES questions are very close so want to make sure there are no numerical errors. Thanks for the sanity check.

I am using MVA method to calculate fault current and i got 8018 A but the CI solution is 8027 A. Could anyone please let me know if i am missing something : Sg1 = 30 MVA/0.24 = 125 MVA, SG2 = 20 MVA/0.24 = 83.33 MVA Since the generators are in parallel, i added both MVAs = SG1+SG2 = 208.33...

@Jabert Thanks for the confirmation.

I did get the same answer but the solution (CI Variation 4 ) says 1110 - j339 A.

Given: A voltage of 131 at an angle of 52 degrees KV is applied across a complex load measuring 125+j87 MVA. Calculate the current across the load ?

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