ABB Relion REB500 Product Manual page 14

Distributed busbar protection REB500
Product version: 8.2
Pole discrepancy
A pole discrepancy protection algorithm supervises that all
three poles of a circuit-breaker open within a given time.
This function monitors the discrepancy between the three-
phase currents of the circuit-breaker.
When it picks up, the function does not send an
intertripping signal to the central unit, but, if configured, it
starts the local breaker failure protection (BFP logic 3).
This function is also performed in a standalone mode in
the bay unit.
Event recording
The events are recorded in each bay unit. A time stamp
with a resolution of 1 ms is attached to every binary event.
Events are divided into the following three groups:
· system events
· protection events
· test events
The events are stored locally in the bay unit or in the
central unit.
Disturbance recording
Disturbance records contain the currents and the binary
inputs and outputs in each bay. Voltages can also be
recorded.
A record can be triggered by either the leading or lagging
edges of all binary signals or by events generated by the
internal protection algorithms. Up to 10 general-purpose
binary inputs may be configured to enable external signals
to trigger a disturbance record. In addition, there is a
binary input in the central and the bay unit for starting the
disturbance recorders of all bay units.
The number of analog channels that can be recorded, the
sampling rate and the recording period are given in Table
35
The total recording time can be divided by a maximum of
40 recording intervals per bay unit.
Each bay unit can record a maximum of 32 binary signals,
12 of them can be configured as trigger signals.
The function can be configured to record the pre-fault and
post-fault states of the signals.
This function is performed in a stand-alone mode in the
bay unit.
Central disturbance recording
In addition to the individual recordings on each bay unit, a
central disturbance recorder can be configured on the
central unit. These records will contain the differential and
restraint currents for each phase and up to 32 buszones
as used within the busbar protection algorithm.
Note:
Stored disturbance data can be transferred via the central
unit to other computer systems for evaluation. Files are
transferred in the COMTRADE format.
14
Communication interface
Communication with the station automation system (SAS)
is possible via the central unit. The interface supports the
station communication protocols IEC 61850-8-1 Edition 1
or Edition 2 and IEC 60870-5-103.
The IEC 61850-8-1 interface transfers the following data
to the station communication via an optical connection:
· differential current of each protection zone
· monitoring information from REB500 central unit and
bay units
· binary events (signals, trips and diagnostic)
· trip reset command
· disturbance records (via MMS file transfer protocol)
· time synchronization with Simple Network Time
Protocol (SNTP). Two independent time servers are
supported. Server 2 is used as backup time.
The central unit supports redundant station bus
communication according to the Parallel Redundancy
Protocol IEC 62439-3. The setting of the parallel
redundant communication is available in the HMI500
configuration tool.
REB500 supports reception of 61850 GOOSE Signals to
start the breaker failure protection.
The IEC 60870-5-103 station communication transfers via
optical connection:
· time synchronization
· selected events listed in the public part
· all binary events assigned to a private part
· all binary events in the generic part
· trip reset command
Test generator
The HMI program (HMI500) which runs on a PC
connected to either a bay unit or the central processing
unit includes a test generator.
During commissioning and system maintenance, the test
generator function enables the user to:
· activate binary input and output signals
· monitor system response
· test the trip circuit up to and including the circuit-breaker
Isolator supervision
The isolator replica is a software feature without any
mechanical switching elements. The software replica logic
determines dynamically the boundaries of the protected
busbar zones (protection zones). The system monitors
any inconsistencies of the binary input circuits connected
to the isolator auxiliary contacts and generates an alarm
after a set time delay.
In the event of an isolator alarm, it is possible to select the
behavior of the busbar protection:
· blocked
· zone-selective blocked
· remain in operation
1MRK 505 352-BEN
Issued: 2016-03-01
Revision: -
ABB