I.L. 40-385.1B
(5/92)
6-7
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
A
= 4A. The STUB bus trips for any V
AN
volt-
age with a target of CIF. Disconnect the voltage from
SBP and reset I
om
= I
L
= 0.5 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:
Va
= 30
Vb
= 70
Vc
= 70
Ia
= 3.5
Ib
= 1
Ic
= 1
Suddenly increase Ia from 3.5 to 4.5A and then turn
I
b
OFF immediately. The relay should trip with LLT
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
b
OFF imme-
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
an
, V
bn
, and V
cn
.
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
AN
, V
BN
or V
CN
)
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
= 8V). After approximately 0.5 sec-
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
GBCV
= CO-8
Z1G = 4.5
GBPU
= 0.5
ITP
= 10
GDIR
= YES
ITG
= 5
GTC
= 24
Repeat Step 10 (AG Fault) with I
AN
= 4.5A. While
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
OM
= 1.0A. Apply a
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
A
. After approx-
imately 0.5 seconds, the “Relay In Service” LED
will be turned off, and the Form C failure alarm
(AL1) contact will be dropped out (deenergized)
indicating a failure condition.
0
°
∠
120
°
–
∠
120
°
∠
75
°
–
∠
120
°
–
∠
+120
°
∠
Содержание REL-300
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Страница 116: ...I L 40 385 1B 6 14 5 92 Figure 6 1 Test Connection for Single Phase to Ground Faults Sheet 1 of 4...
Страница 117: ...I L 40 385 1B 5 92 6 15 Figure 6 2 Test Connection for Three Phase Faults 1502B51 Sub 1 Sheet 2 of 4...
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