Rf-3:- O/C E/F Settings Calculations for Grid Line.

OcEf Calc Grid Line
       132kV Double Circuit 0.2 ACSR line A-B is in grid.  Circuit-I end A CT Ratio is /1 Amp.  And end B CT Ratio is /1 Amp. 
       Bus-A 3-Ph short circuit current is  Amp  and 1-Ph short circuit current is  Amp  Bus-B 3-Ph short circuit current is  Amp  and 1-Ph short circuit current is  Amp 
       For bus A; lines contribute  % of fault current  and For bus B; lines contribute  % of fault current;
       Find out the settings for O/C and E/F relay at End-A and End-B.
(Note: Use setting methodology as recommanded in this documentation).
Section-A: Calculations End-A.
1) End-A Overcurrent PSM (Roundup to 5%) =    %
2) End-A For 3-ph fault CT secondary current =    Amp
3) End-A For overcurrent relay CT secondary current as multiple of PSM =   X
4a) End-A Time of operation for O/C relay with TMS 1 =   sec

4b) End-A To have time of operation as 350 ms TMS =   %
5) End-A Earth fault PSM =   30%    20%    15%
6) End-A For 1-ph fault CT secondary current =   Amp
7) End-A For earthfault relay CT secondary current as multiple of PSM =   X.
8a) End-A Time of operation for E/F relay with TMS 1 =   sec

8b) End-A To have time of operation as 350 ms TMS =   %
Section-B: Calculations End-B.
9) End-B Overcurrent PSM (Roundup to 5%) =    %
10) End-B For 3-ph fault relay current =    Amp
11) End-B For overcurrent relay current as multiple of PSM =   X
12a) End-B Time of operation for O/C relay with TMS 1 =   sec

12b) End-B To have time of operation as 350 ms TMS =   %
13) End-B Earth fault PSM =   30%    20%    15%
14) End-B For 1-ph fault CT secondary current =   Amp
15) End-B For earthfault relay CT secondary current as multiple of PSM =   X.
16a) End-B Time of operation for E/F relay with TMS 1 =   sec

16b) End-B To have time of operation as 350 ms TMS =   %
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