BECKWITH ELECTRIC M-3425A, Instruction Book

Page: 340 / 482

6–53
Testing – 6
Directional Test
:
1. Enable Directional Element.
2. Press the
TARGET RESET
pushbutton to reset targets.
3. Apply
Nominal Voltage
to the input of the selected Polarization Type. If 3V
0
, use any one of the
phase voltages, or all three at zero sequence.
The
Nominal Voltage
value previously input to the relay is described in Section 4.2, Setup System
and should be recorded on Figure A-2, Setup System Record Form.
4. Set the current angle to an angle greater than 100° from
MSA
.
5. Apply current 10% greater than
P
I3, (
for type 3, use P
) to all three phases.
6. Press and hold the
Target Reset
pushbutton, then slowly swing the angle of the selected operating
current towards the
MSA
until the
GND DIFF/DIR O/C 87GD/67N
LED illuminates, or the function
status indicator on the
Monitor Function Status
screen indicates that the function has picked up.
The angle should be equal to
A
–90° or +90°, depending to which side of
MSA
the current has been
set.
7. Release the
TARGET RESET
pushbutton.
8. Swing the current angle away from the
MSA
. The
OUTPUT
LED will extinguish.