RDCU-02C 64607901 ABB Relion® 650/670 series protection devices distributed communication control units

Product Overview

ABB RDCU-02C is a Distributed communication and control unit (Remote Distributed) specifically designed for Relion® 650 and 670 series multi-functional protection relays (such as REF650, REM650, REB650, RED670, etc.) (Communication Unit). As an intelligent expansion node of the main protection device, RDCU-02C not only provides additional digital input/output (DI/DO) channels, but also supports IEC 61850 GOOSE communication, achieving high-speed interlocking, state sharing and distributed automation logic.

Core features

Flexible I/O expansion
16-channel programmable digital input (DI) : Supports dry contacts or wet contacts (24-250 V DC/AC)
8-channel programmable relay output (DO) : single-pole double-throw (SPDT) contacts, 5 A @ 250 V AC
High-speed communication interface
2 × Fiber optic ST interface: Supports IEC 61850-9-2 LE/GOOSE (rate 100 Mbps)
1 × RS-485 interface: For local debugging or Modbus RTU (optional)
Plug-and-play configuration: Automatically recognized through the PCM600 engineering tool, supporting online parameter download
High anti-interference and isolation:
The electrical isolation between input and output is ≥ 5 kV
It complies with strict EMC standards such as IEC 61000-4-5 (Surge) and IEC 61000-4-5 (EFT)
LED status indication: Power supply, operation, communication, fault, and the status of each DI/DO channel are clearly visible
Wide temperature design: Suitable for extreme industrial environments ranging from -40°C to +70°C

Technical parameters

Digital substation: As a GOOSE network terminal, it realizes the interlocking of circuit breaker failure and busbar protection
Large motor group control: Centralized collection of the status of multiple motors, remote start and stop, and feedback of operation signals
Distributed energy access: Achieving coordinated control of inverters and disconnectors in photovoltaic/wind farms
Industrial distribution network automation: Building a "hardwired" interlocking logic to reduce construction and maintenance costs
Renovation project: On the basis of retaining the original protective devices, rapidly upgrade to the IEC 61850 architecture

Installation and Usage instructions
Mechanical installation
Installed on the DIN rail inside the target switch cabinet, close to the monitored equipment;
The panel can be fixed using the included bracket.
Electrical and communication connections
Connect the RDCU interface of the main relay through a dedicated 12-core shielded cable;
The optical fiber is connected to the station-level Process Bus switch.
The on-site signal lines are connected to the terminal block (DI: 1-32; DO: 33-48).
Software configuration
Guide the main relay configuration in the PCM600 engineering tool;
Automatically identify RDCU-02C and allocate DI/DO logic functions;
Configure the GOOSE publish/subscribe dataset (such as "Circuit breaker Position → Busbar differential protection").
Debugging and verification
Monitor the I/O status online through the front panel LED or PCM600.
Verify the correctness of the GOOSE message using the IEC 61850 SCL file.

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