The ABB REB500BU, also cataloged as the REB500BU Bay Unit, operates as a dedicated hardware component for localized current signal acquisition and data processing within REB500 distributed busbar protection system platforms. This hardware unit captures analog current transformer vectors, isolator status inputs, and breaker position transitions directly at the bay interface layer. It converts these physical inputs into low-latency digital streams to drive decentralized differential protection algorithms and execute breaker failure logic before transmitting processed zone data to the central terminal.
Hardware Specifications
Parameter
Specification
Model
REB500BU
Brand
ABB
Origin
Switzerland
Weight
2.4 kg
Dimensions
100 mm x 160 mm x 160 mm (W x H x D)
Operating Temp
-25 deg C to +55 deg C
Power Consumption
24-250 V DC (configuration-dependent)
Part Number
1KHL160006R0001H
Protocol Suite
IEC 61850-8-1 (GOOSE, MMS), PRP (IEC 62439-3)
System Input Matrix
CT inputs, isolator status, breaker position
Synchronization
SNTP or PPS time synchronization
Compliance Base
IEC 60255 series standards
Frequently Asked Questions
Q: How does the REB500BU differentiate between internal busbar faults and through-fault current conditions?
A: The module executes dedicated local differential protection algorithms combined with internal check zone logic. By analyzing the directional phase alignment and current vector sums from the bay CT inputs, it verifies if a fault sits inside the isolated bus zone prior to releasing its high-speed trip command.
Q: What time synchronization methods are required to align data samples between multiple REB500BU bay units?
A: The bay unit utilizes either a dedicated pulse-per-second (PPS) hardware input link or an Ethernet-distributed SNTP master clock source to synchronize internal sampling clocks within microsecond tolerances, preventing artificial differential errors.
