ABB REL300 Instruction Manual page 149

Reset: LLT = NO
Step 30.
NOTE: The "RELAY IN SERVICE" LED will not be turned "OFF" for the condition of setting
LOPB = DIST, but Zone 1, 2, 3 and pilot distance units will be blocked and all overcur-
rent units (GB, ITP, and ITG) will be converted to non-directional operation.
Step 31.
Step 32.
1.1.1.12 Loss-Of-Current (LOI) Test
Step 33.
Z2P = Z2G = OUT
T2P = T2G = BLK
Disconnect all current inputs. Connect 3 balanced voltages of 70 Vac to V
and V . Using the SETTINGS mode, change the setting: LOPB = DIST.
cn
LOPB will be set if the following logic is satisfied:
• one (or more) input voltages (V
out ∆I change, or
• a 3Vo (> 7Vrms) is detected with 3Io <Ios
• Apply V , V and V
AN BN
mode; the display shows LOPB = NO. Reduce VAN to 62 Vrms (e.g., 3V
After approximately 0.5 seconds, the display shows LOPB = YES and GS contact
(AL-3), should be closed.
Set the relay as follows:
Z1P = 4.5
Z1GF = 4.5
Z1GR = 0.01
ITP = 10
ITG = 5
Repeat Step 10. AG Fault) with I
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 relay will trip. Reset LOPB = NO; the
relay should not trip for the reversed fault. Set LOPB = ALL. The relay "In Service"
LED will be turned off for the fault voltages applied and the relay will not trip for the
forward or reverse fault current (4.5A).
Set LOPB = DIST. Apply a balanced three-phase voltage (70 Vrms) and current
(3A). Turn off Va; the relay should not trip. Reset LOPB to NO.
Set LOIB to YES and I OM = 1.0A. Apply a balanced three-phase voltage (70
Vrms). Connect the current inputs per Figure B-1, and apply a single phase current
, V or V ) are detected (as <7 Vrms) with-
AN BN CN
rated voltage to REL300. Scroll the LED to metering
CN
GBCV = CO-8
GBPU = 0.5
GDIR = YES
GTC = 24
= 4.5A. While in the metering mode, be sure
AN
I.L. 40-385.7
, V ,
an bn
= 8V).
0
A-15