Testing – 6
6–35
5.
Directional Test
: Enable directional feature. Reset targets and apply Nominal Voltage to all three
phases. Set the current angle to an angle more than 100° from
MSA
. Apply current 10% more than
P
I3, (
for type 3, use P
) to all three phases. Hold the
Target Reset
button in and slowly swing the
angle of the currents applied towards the
MSA
until the
RES DIR DEF TIME O/C 67NDT
LED lights,
or the pickup indicator operates on the computer target screen. The angle should be equal to A –90°
or +90°, depending to which side of
MSA
the current has been set. Release the
TARGET RESET
button and swing the current angle away from the
MSA
, and the
OUTPUT
LED will go out.
■
NOTE
: MSA is not used in type 4.
6.
Time Delay Test
:
Disable the Directional and Three-Phase Detect features, if enabled. Apply
Nominal Voltage to all three phases. Apply current 10% less than
P
I3, (
for type 3, use P
) to all three
phases. With output contacts connected to a timer, apply
P
+10% Amps, and start timing. The
contacts will close after
D
cycles within –1 to +3 cycles or
&
3%.
7.
If testing is complete, enable any functions disabled for this test. If other tests are to be completed,
check the proper functions to disable for the next test and proceed from this point.
Содержание M-3520
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