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ADDC Testing and Protection Section
42608022.xls/IDMT OC-Outgoing 1/2
Setting Calculation Protocol for IDMT Overcurrent Relay Settings
Station:
Contract:
Consultant:
Contractor:
Feeder ID: Outgoing Feeder (Typical)
Relay: Relay Type: Numerical Relay Model: Delta Relay Make: VATECH
CT Data:CT Ratio Prim. Current Sec. Current Burden, VA Class Rct
600 1 15 - 10 5P15 -
Fault Data:
L-L Fault L-G Fault
Min. Fault Current, A 11000 8100
Max. Fault Current, A 22000 16200
FAULT SETTING CALCULATION FOR IDMT O/C
General Data:
Overload Current: 480 (125% of Full load current of Protected Object)
PMS (Plug Multiplier Setting): 0.8
Curve Selected: Normal Inverse (NI)
2.17 sec .........Eq. 1
22.92 1.06 .........Eq. 2
0.3 sec
Grading Margin (0.3sec) 0 sec
0.139 .........Eq. 3
Final TMS set at: 0.13
0.271 sec
0.433 sec (for Sample)
Adopted Settings:
PMS: 0.8
TMS: 0.13
10xIn
Is settings co-ordinated with downstream side: Yes/No
Is settings co-ordinated with upstream side: Yes/No
600/400/1
Fault Current, If
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]:
High Set (I>>):
ADDC Testing and Protection Section
42608022.xls/IDMT EF-Outgoing 2/2
Setting Calculation Protocol for IDMT Earth Fault Relay Settings
Station:
Contract:
Consultant:
Contractor:
Feeder ID: Outgoing Feeder (Typical)
Relay: Relay Type: Numerical Relay Model: Delta Relay Make: VATECH
CT Data:CT Ratio Prim. Current Sec. Current Burden, VA Class Rct
600 1 15 - 10 5P15 -
Fault Data:
L-L Fault L-G Fault
Min. Fault Current, A 11000 8100
Max. Fault Current, A 22000 16200
FAULT SETTING CALCULATION FOR IDMT O/C
General Data:
Earth Fault Current: 0.2 (25% of OC PMS)
PMS (Plug Multiplier Setting): 0.2
Curve Selected: Normal Inverse (NI)
1.59 sec .........Eq. 1
67.50 1.09 .........Eq. 2
0.3 sec
Grading Margin (0.3sec) 0 sec
0.188 .........Eq. 3
Final TMS set at: 0.2
0.319 sec
Adopted Settings:
PMS: 0.2
TMS: 0.2
8xIn
Is settings co-ordinated with downstream side: Yes/No
Is settings co-ordinated with upstream side: Yes/No
600/400/1
Fault Current, If
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 0.2, sec '=0.14*0.2/[(PSM)0.02 - 1]:
High Set (I0>>):
