Commissioning Test Worksheet
SEL-387E Relay Page 1 of 2
Date Code 20080110
S
YSTEM
I
NFORMATION
System Settings
RID (Relay identification) =
TID (Terminal identification) =
MVA (Maximum transformer rating) =
Winding 1 Winding 2 Winding 3
Current transformer
connection:
W1CT =
W2CT =
W3CT =
Current transformer ratio: CTR1 = CTR2 = CTR3 =
Connection compensation: W1CTC = W2CTC = W3CTC=
Nominal line-to-line
voltage (kV):
VWDG1 =
VWDG2=
VWDG3=
Tap calculation: TAP1 = TAP2 = TAP3 =
Differential Settings
O87P = SLP1 = SLP2 = IRS1 = U87P =
Metered Load (Data taken from substation panel meters, not the SEL-387E Relay)
± Readings from meters Winding 1 Winding 2 Winding 3
Megawatts: MW1 = MW2 = MW3 =
Megavars: MVAR1 = MVAR2= MVAR3 =
MVA calculation:
22
MVARnMWnMVAn
+=
MVA1=
MVA2=
MVA3=
Calculated Relay Load
Winding 1 Winding 2 Winding 3
Primary Amperes calculation:
VWDGn3
1000MVAn
Inpri
⋅
⋅
=
I1pri =
I2pri =
I3pri =
Secondary Amperes calculation:
CTRn
Inpri
secIn,YWnCT ==
CTRn
3Inpri
secIn,DWnCT
⋅
==
I1sec =
I2sec =
I3sec =
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