AC-PRO
®
& AC-PRO-II
®
B-292 Secondary Injection Test Set Instruction Manual Rev 1.1
www.utilityrelay.com
Page 15
4.12
Ground Fault (GF) Pick-Up Test
Verify that the Ground Fault Type (10) selector
switch is in the correct position for the
AC-PRO or AC-PRO-II being tested.
To test the GF pick-up:
1)
Set the Phase selector (11) switch
to GF.
2)
Hold down the Current Preset (13)
while adjusting the Amp Coarse (14)
and Fine (15) pots to 90% of the
calculated GF
SPU.
3)
Push the Start (5) button but leave the
test current on only long enough to see
if a GF trip occurs.
A GF trip should NOT occur.
4)
Hold down the Current Preset (13)
while adjusting the Amp Coarse (14)
and Fine (15) pots to 110% of the
calculated GF
SPU.
5)
Push the Clear (8) button to reset the
Timer (6) to zero.
6)
Push the Start (5) button.
A GF trip should occur. The test set
current will stop and the Timer (6) will
freeze displaying the trip time.
7)
Verify that the trip unit saved the proper
last trip data.
4.13
Ground Fault (GF) Time Test
To test the GF time delay trip:
1)
The first step is to select a test current.
For example, 150% of the GF pick-up.
The desired test current is then 1.5 X
GF
SPU
.
Note, to accurately test the GF delay, the
test current must be at least 110% of the GF
pick-up.
2)
Hold down the Current Preset (13)
while adjusting the Amp Coarse (14)
and Fine (15) pots until the Display (12)
shows the test current calculated in
step 1.
3)
Set the Phase selector (11) to GF.
4)
Push the Clear (8) button to reset the
timer (6) to zero.
5)
Push the Start (5) button.
6)
When the trip unit trips, the test set
current will stop and the Timer (6) will
freeze displaying the trip time.
7)
Compare the trip time with the TCC in
Figure 10 or Figure 13 for the GF time
band and I
2
T settings in the AC-PRO
or AC-PRO-II.
8)
Verify that the trip unit saved the proper
last trip data.
4.14
AC-PRO Unbalance Testing
The AC-PRO Unbalance function cannot be
tested with this test set.
