ABB RELION REB500 Technical Manual page 57

1MRK 505 406-UEN B
Ext Blk PSB
This input blocks the power-swing blocking function.
Ext Blk O/C backup
This input blocks the backup overcurrent protection (O/C Back-up Protection).
Deadline
The signal applied to this input is needed by the switch-onto-fault logic to indicate to the
distance function that the line is dead before the circuit-breaker is closed. It is used for the
switch-onto-fault logic providing the VTs are on the busbars.
Manual Close
Prior to manually closing the circuit-breaker, this signal enables the switch-onto-fault logic and
blocks the VT supervision function.
ZExtension, ZExtensionAR
The overreaching logic permits instantaneous tripping within the overreaching zone. It is
enabled via the binary input ZExtension or ZExtensionAR. For this purpose, the output
ZExtension of the autoreclosure function is connected to the input ZExtensionAR.
Isol open
This input is required by the STUB protection to ascertain whether an isolator is open or not.
ComRec
This input is needed for the external signal ComRec (signal received by PLC, optical fiber link or
point-to-point radio).
ComFail
This input signals to the protection that the PLC channel has failed.
1PolAR
This input permits single-phase tripping to take place and is used in conjunction with single or
three-phase autoreclosure schemes.
See Section 5.8
ExtBlkSOTF
This input is needed in cases where the switch-onto-fault logic is not enabled after an
autoreclosure. See
ExtBlkHF
This input blocks the reception of an intertripping signal. It is used for coordinating
communication channel signals when in a solidly grounded system, the distance protection
and the E/F protection use the same channel. It must be connected to the RecBlk signal of the
ground fault function.
ExtBlock Z1
This input blocks measurement in zone 1.
Bay protection functions REB500
Technical manual
for the connection to the autoreclosure function.
Section 5.8 for the connection to the autoreclosure function.
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Section 5
Bay protection functions
51