ABB REL300 Instruction Manual page 153

1.1.2.3 PUTT or POTT Schemes
Step 10.
NOTE: The pilot distance unit can be set at the forward (PLGF) and reverse (PLGR) directions.
Use Step 10 (a), (b), (c), and (d) in the Non-pilot Acceptance Tests to verify the accuracy
if necessary.
Step 11.
Step 12.
Step 13.
Step 14.
1.1.2.4 Weakfeed Scheme
Step 15.
NOTE: Do not apply fault current.
Change the setting to STYP = PUTT (for underreach scheme) or STYP = POTT
(for overreach scheme). In order to determine setting accuracy (6 ohms), the for-
ward directional ground unit must be disabled. Set FDGT = BLK. Apply a rated volt-
age to RCVR #1 terminals TB5/7(+) and TB5/8(-), and apply an AG fault as shown
in Step 10 of the Non-Pilot Acceptance Test. The trip contact A should be closed
= 3A (± 5%); the target should show "PLTG AG", and the CARRY
at the input I
a
SEND contact should be "closed" for POTT setting. The RI2 should be "closed" if
PTRI is set to "YES". Do not test carry STOP for POTT and PUTT schemes.
Apply a reversed AG fault (I
CARRY SEND contact should stay "open".
Remove the voltage on RCVR #1. Apply a forward AG fault as shown in Step 10.
The trip contacts should remain "open" for I
Change the LED mode to TEST and select the function "RS1". Push the ENTER
button; the ENTER LED should be "ON". Repeat Step 12 with the ENTER button
depressed. The relay should trip.
Repeat steps 8 and 9 for FDGT and BFRB tests, by using Step 10 with Ia = 1.5 A.
This function is for POTT only. In addition to the setting changes in Step 2, change
the following settings:
• STYP POTT
• WFEN YES
• Z3GF 4.5
• Z3GR 0.01
• Z3P 4.5
• Z3FR REV
Apply a rated voltage to PLT/ENA terminals TB5/9(+) and TB5/10(-), also RCVR
#1 terminals TB5/7(+) and TB5/8(-).
With V = V = V = 70 Vrms applied (as shown in Figure B-1), the relay should
an bn cn
operate normally.
leads V by 105°). The relay should not trip, and the
a a
= 5A.
a
I.L. 40-385.7
A-19