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JMP7 and 9 should be IN; JMP13 should be at
the rated voltage position. Select CIF = STUB.
Disconnect the voltage from 52b and connect it
to terminals TB5/13(+) and TB5/14(-).
NOTE: Make sure the jumpers (JMP8 and
JMP10) are not IN before applying the
voltage to TB5/13(+) and TB5/14(-).
Apply I
= 4A. The STUB bus trips for any V
A
age with a target of CIF. Disconnect the voltage from
SBP and reset I
= I
om
L
1.1.11 Loss-of-Potential (LOP) Test
Step 29. For Load Loss Trip (LLT), set:
LLT = Yes
Z2P = Z2G = 4.5 ohms
T2P = T2G = 2.99 sec (or BLK)
Apply:
∠
Va
= 30
0°
∠
Vb
= 70
–
120°
∠
Vc
= 70
120°
∠
Ia
= 3.5
–
75°
∠
Ib
= 1
–
120°
∠
Ic
= 1
+120°
Suddenly increase Ia from 3.5 to 4.5A and then turn
I
OFF immediately. The relay should trip with LLT
b
target. The trip is accelerated due to the pickup of
Zone 2 and the setting of LLT = YES.
Change the setting of LLT = FDOG and the input
current Ia from 0.5 to 1.5A; then turn I
diately. The relay should trip with a target of LLT.
The trip is due to the pickup of FDOG and setting of
LLT = FDOG.
Reset: LLT = NO
Z2P = Z2G = OUT
T2P = T2G = BLK
Step 30. Disconnect all current inputs. Connect 3
balanced voltages of 70 Vac to V
Using the SETTINGS mode, change the setting:
LOPB = YES.
(5/92)
AN
= 0.5 and CIF = NO.
OFF imme-
b
, V
, and V
an
bn
NOTE: The "RELAY IN SERVICE" LED will not
be turned "OFF" for the condition of set-
ting LOPB = Yes, but Zone 1, 2, 3 and pi-
lot distance units will be blocked and all
overcurrent units (GB, ITP, and ITG) will
be converted to non-directional opera-
tion.
LOPB will be set if the following logic is satisfied:
volt-
• one (or more) input voltages (V
are detected (as <7 Vrms) without ∆I change,
or
• a 3Vo (> 7Vrms) is detected with 3Io <Ios
Apply VAN, VBN and VCN rated voltage to
MDAR. Scroll the LED to metering mode; the dis-
play shows LOPB = NO. Reduce VAN to 62 Vrms
(e.g., 3V
0
onds, the display shows LOPB = YES and the
form C failure alarm (AL1) contact is also de-
energized.
Step 31. Set the relay as follows:
Z1P = 4.5
Z1G = 4.5
ITP
= 10
ITG
= 5
Repeat Step 10 (AG Fault) with I
in the metering mode, be sure that LOPB = YES
before the fault current is applied. The relay
should be tripped with a target of GB. Apply 5.5A;
the relay should be tripped with a target of ITG.
Repeat the test with a reversed AG Fault; the re-
lay will trip. Reset LOPB = NO; the relay should
not trip for the reversed fault. Set LOPB = YES.
Step 32. Apply a balanced three-phase voltage (70
Vrms) and current (3A). Turn off Va; the relay
should not trip. Reset LOPB to NO.
1.1.12 Loss-Of-Current (LOI) Test
Step 33. Set LOIB to YES and I
balanced three-phase voltage (70 Vrms). Con-
nect the current inputs per Figure 6-1, and apply
a single phase current of 1.1A to I
imately 0.5 seconds, the "Relay In Service" LED
.
will be turned off, and the Form C failure alarm
cn
(AL1) contact will be dropped out (deenergized)
indicating a failure condition.
I.L. 40-385.1B
AN
= 8V). After approximately 0.5 sec-
GBCV = CO-8
GBPU = 0.5
GDIR
= YES
GTC
= 24
AN
= 1.0A. Apply a
OM
. After approx-
A
, V
or V
)
BN
CN
= 4.5A. While
6-7
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