ABB REB500 - Binary Outputs on Bay Units

1MRK 505 350-UEN Section 2
Signals
Technical Manual 13
Distributed busbar protection REB500
2.3 Binary outputs on bay units
Table 11 BU general output signals
Signal Description
21105_EXTERNAL TRIP
Tripping command generated by the
external input 11105_EX
-
TERNAL TRIP.
21110_TRIP
Tripping command generated by the station protection intertripping
function (BBP, BFP t2 etc.).
21115_REMOTE TRIP
Any of the protection functions that are capable of tripping an entire
section of busbar (intertripping) can initiate a remote trip signal.
Protection functions of this kind are: BBP, BFP, EFP, or the
command “EXTERNAL TRIP”.
Remote tripping can only take place if a fault cannot be cleared by
the circuit-breaker in the bay concerned. This applies in the
following cases:
· 1½ breaker schemes
· Bypass operation with the bus tie breaker being used for
a feeder
· Circuit-breaker bypassed by an isolator
· Feeder not equipped with an own circuit-breaker.
More details on special application cases are given in the
Application Manual.
21120_EXT_TEST_TRIP
Generates a multi
-
pole trip for test purposes. Controlled by the
binary input signal
11115_Ext_Test_TRIP
.
21305_Trip
Signals tripping by the bay unit and can be set by any of the station
protection functions.
21405_SP blocked
Signals that the station protection functions including “EXTERNAL
TRIP” and intertripping are blocked (either the bay concerned or
throughout the station).
21410_Output relays blocked
All the output contacts configured in the bay unit co
ncerned are
blocked.
21805_In service
Signal set by the diagnostic function that shows whether or not a
bay unit is operational and standing by.
21810_Loss of supply voltage
This signals a failure of the isolator auxiliary supply (“Supervision
aux. voltage_x”) in the bay unit.
21815_Inspection/maintenance
This signal appears when an inspection or maintenance input is set
in the bay unit and a position indicator on an isolator or circuit-
breaker connected to the bay unit is forced into a particular status.
Forcing of an isolator or circuit-breaker in this context means: The
item of switchgear changes either from CLOSED to OPEN or from
OPEN to CLOSED.
21820_Alarm
Signals an alarm situation in a bay unit: if an auxiliary supply fault is
being signaled or if a bay unit diagnostic system has detected an
analog signal processing error.
In Table 12, the column “T” signifies the type of the signal: ● are considered for
trip output while ○ are considered for signalization purpose. Column “L” shows
whether the signal additionally appears in the trip list (●), in the alarm list (○), or in
no list (-).