setting calculation protocol for idmt over current relay

ADDC Testing and Protection Section document.xls/IDMT OC-Outgoing 1/6 Setting Calculation Protocol for IDMT Overcurrent Relay Se Station: Contract: Feeder ID: Outgoing Feeder (Typical) Relay: Relay Type: Numerical Relay Model: Delta Relay Make: CT Data: CT Ratio Prim. Current Sec. Current Burden, VA Class 100 1 15 - 10 5P15 L-L Fault L-G Fault 6975 699.83 FAULT SETTING CALCULATION FOR IDMT O/C General Data: Overload Current: 75.6 0.756 Curve Selected: Normal Inverse (NI) 1.48 sec 92.26 1.09 0.1 sec Grading Margin (0.3sec) 0.5 sec 0.406 Final TMS set at: 0.5 0.739 sec 0.296 sec Adopted Settings: PMS: 0.756 TMS: 0.5 10xIn Consultant : Contractor : 600 /400/1 Fault Data: Fault Current, If Min. Fault Current, A Max. Fault Current, A (125% of Full load curren PMS (Plug Multiplier Setting): Operating time at TMS 1, sec '=0.14/[(PSM)0.02 - 1]: PSM (Plus Setting Multiplier): '=[(Ifmin/Prim.Current) * (Sec.Rated Current/PMS)] Assuming Prot. Op. time, sec: (0.3sec) Hence TMS: ('= (0.3+0) / (Result from Eq.1) Operating time at TMS 0.125, sec '=0.14*0.125/[(PSM)0.02 - 1]: Operating time at TMS 0.2, sec '=0.14*0.2/[(PSM)0.02 - 1]: (for Sample) High Set (I>>):

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IDMT OC-Outgoing Setting Calculation Protocol for IDMT Overcurrent Relay SettingsStation:Contract:Consultant:Contractor:Feeder ID:Outgoing Feeder (Typical)Relay:Relay Type:NumericalRelay Model:DeltaRelay Make:VATECHCT Data:CT RatioPrim. CurrentSec. CurrentBurden, VAClassRct600/400/1100115 - 105P15-Fault Data:Fault Current, IfL-L FaultL-G FaultMin. Fault Current, A6975699.83Max. Fault Current, AFAULT SETTING CALCULATION FOR IDMT O/CGeneral Data:Overload Current:75.6(125% of Full load current of Protected Object)PMS (Plug Multiplier Setting):0.756Curve Selected:Normal Inverse (NI)Operating time at TMS 1, sec '=0.14/[(PSM)0.02 - 1]:1.48sec.........Eq. 1PSM (Plus Setting Multiplier): '=[(Ifmin/Prim.Current) * (Sec.Rated Current/PMS)]92.261.09.........Eq. 2Assuming Prot. Op. time, sec: (0.3sec)0.1secGrading Margin (0.3sec)0.5secHence TMS: ('= (0.3+0) / (Result from Eq.1)0.406.........Eq. 3Final TMS set at:0.5Operating time at TMS 0.125, sec '=0.14*0.125/[(PSM)0.02 - 1]:0.739secOperating time at TMS 0.2, sec '=0.14*0.2/[(PSM)0.02 - 1]:0.296sec(for Sample)Adopted Settings:PMS:0.756TMS:0.5High Set (I>>):10xInIs settings co-ordinated with downstream side:Yes/NoIs settings co-ordinated with upstream side:Yes/No

&R&"Arial,Bold"&9&UADDC Testing and Protection Section&L&8&F/&A&R&8&P/&N

IDMT EF-OutgoingSetting Calculation Protocol for IDMT Earth Fault Relay SettingsStation:Contract:Consultant:Contractor:Feeder ID:Outgoing Feeder (Typical)Relay:Relay Type:NumericalRelay Model:DeltaRelay Make:VATECHCT Data:CT RatioPrim. CurrentSec. CurrentBurden, VAClassRct600/400/1100115 - 105P15-Fault Data:Fault Current, IfL-L FaultL-G FaultMin. Fault Current, A6975699.83Max. Fault Current, AFAULT SETTING CALCULATION FOR IDMT O/CGeneral Data:Earth Fault Current:0.189(25% of OC PMS)PMS (Plug Multiplier Setting):0.189Curve Selected:Normal Inverse (NI)Operating time at TMS 1, sec '=0.14/[(PSM)0.02 - 1]:1.87sec.........Eq. 1PSM (Plus Setting Multiplier): '=[(Ifmin/Prim.Current) * (Sec.Rated Current/PMS)]37.031.07.........Eq. 2Assuming Prot. Op. time, sec: (0.3sec)0.1secGrading Margin (0.3sec)0secHence TMS: ('= (0.3+0) / (Result from Eq.1)0.054.........Eq. 3Final TMS set at:0.2Operating time at TMS 0.2, sec '=0.14*0.2/[(PSM)0.02 - 1]:0.374secAdopted Settings:PMS:0.189TMS:0.2High Set (I0>>):8xInIs settings co-ordinated with downstream side:Yes/NoIs settings co-ordinated with upstream side:Yes/No

&R&"Arial,Bold"&9&UADDC Testing and Protection Section&L&8&F/&A&R&8&P/&N

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