Commissioning Test Worksheet
SEL-387E Relay Page 2 of 2
Date Code 20080110
C
ONNECTION
C
HECK
Differential Connection
(issue MET DIF<Enter> to serial port or front panel)
Note: System load conditions should be higher than 0.1 A secondary. 0.5 A secondary is recommended for
the best results.
Operate Current: IOP1 = IOP2 = IOP3 =
Restraint Current: IRT1 = IRT2 = IRT3 =
Mismatch Calculation:
IRTn
IOPn
MMn =
MM1 =
MM2 =
MM3 =
Check individual current magnitudes, phase angles, and operate and restraint currents in an event report if
mismatch is not less than 0.10.
M
AGNITUDE
, A
NGLE
,
AND
P
HASE
R
OTATION
C
HECK
(issue MET SEC<Enter> to the serial port or front panel)
Winding 1 Winding 2 Winding 3
A-Phase Secondary Amperes: IAW1 = IAW2 = IAW3 =
A-Phase Angle:
B-Phase Secondary Amperes: IBW1 = IBW2 = IBW3 =
B-Phase Angle:
C-Phase Secondary Amperes: ICW1 = ICW2 = ICW3 =
C-Phase Angle:
1. Calculated relay amperes match MET SEC amperes?
2. Phase rotation is as expected for each winding?
3. Do angular relationships among windings correspond to expected results? (Remember that secondary current
values for load current flowing out of a winding will be 180° out of phase with the reference phase position for
that winding, because CT polarity marks normally face away from the transformer on all windings.)
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