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• +90°( ±87°)
• +177°
1.1.10 CIF, IOM, IL and LV Tests
Step 26. Set the relay per Table A-1. Change the
following settings: IOM = 3, IL = 2, CIF = YES,
and connect a rated dc voltage to 52b, between
TB5/3 (+) and TB5/4 (-). Apply an AG fault as
shown in Step 10 (Figure A-1). The relay should
trip at I
= 2A (IL) with CIF target.
a
Step 27. Change IL setting from 2 to 3.5A and re-
peat the test shown in Step 26. The relay should
trip at I
= 3A (IOM) with CIF target.
a
Step 28. LV setting test. Set LV = 60 and with I
4A, apply AG fault as shown in Step 10. The CIF
trip should be for V
AN
nect the voltage from 52b and reset I
and CIF = NO.
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:
∠
0°
V
= 30
a
∠
–
120°
V
= 70
b
∠
120°
V
= 70
c
∠
–
75°
I
= 3.5
a
∠
–
120°
I
= 1
b
∠
+120°
I
= 1
c
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.
Reset: LLT = NO
Z2P = Z2G = OUT
T2P = T2G = BLK
AN
±
<60 Vrms
5%. Discon-
= I L = 0.5
OM
Step 30. Disconnect all current inputs. Connect 3
balanced voltages of 70 Vac to V
Using the SETTINGS mode, change the setting:
LOPB = YES.
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:
•
one (or more) input voltages (V
) are detected (as <7 Vrms) without ∆I
V
CN
=
change, or
•
a 3Vo (> 7Vrms) is detected with 3Io <Ios
•
Apply V
AN
MDAR. Scroll the LED to metering mode; the
display shows LOPB = NO. Reduce VAN to
62 Vrms (e.g., 3V
ly 0.5 seconds, the display shows LOPB =
YES and the form C failure alarm (AL1) con-
tact is also deenergized.
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 A-1, and apply
a single phase current of 1.1A to I
I.L. 40-385.5
, V
an
bn
AN
, V
and V
rated voltage to
BN
CN
= 8V). After approximate-
0
GBCV = CO-8
GBPU = 0.5
GDIR
= YES
GTC
= 24
= 4.5A. While
AN
= 1.0A. Apply a
OM
. After approx-
A
, and V
.
cn
, V
or
BN
A-7
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