Description
| Product Model | REU615 |
| Manufacturer | ABB (Relion® 615 Series) |
| Product Category | Voltage Protection and Control Relay |
| Communication Protocols | IEC 61850 Ed. 2, GOOSE, IEC 61850-9-2 LE, Modbus, DNP3 |
| Standard Configuration A | Busbar Voltage Supervision, Load Shedding, Frequency Protection |
| Standard Configuration B | Automatic Voltage Regulation (On-Load Tap Changer) |
| Protection Functions | Over/Under Voltage, Over/Under Frequency, Arc Fault (Optional) |
| Time Synchronization | IEEE 1588 v2 Precision Time Protocol |
| Redundancy Protocols | HSR (High-availability Seamless Redundancy), PRP |
| HMI Interface | Editable Single-Line Diagram, Local/Web-Based Access |
| Installation Method | Rack-Mounted, Pluggable Modular Design |
| Environmental Compliance | IEC Standards for Electromagnetic Compatibility |
Product Introduction
The REU615 is a highly versatile voltage protection and control relay within the ABB Relion® 615 product family, specifically engineered for utility and industrial power distribution networks. Designed to manage complex grid dynamics, the REU615 provides comprehensive voltage and frequency supervision, making it an essential component for maintaining system stability in modern substations. Its architecture is built around the IEC 61850 standard, allowing for seamless peer-to-peer communication and integration within advanced substation automation systems.
What sets the REU615 apart is its dual-standard configuration flexibility. Standard Configuration A is optimized for busbar voltage monitoring, load shedding, restoration, and loss-of-mains (LOM) protection for distributed generation. Conversely, Standard Configuration B is dedicated to automatic voltage regulation via on-load tap changers (OLTC) on power transformers. Both configurations include integrated circuit breaker control, measurement, and supervision functions.
By consolidating multiple protection and control tasks into a single, compact IED, the REU615 significantly reduces panel space and wiring complexity. Whether deployed as a standalone feeder protector or integrated into a broader SCADA network via GOOSE messaging, the REU615 delivers deterministic performance, fast fault isolation, and reliable grid management for critical infrastructure.
Core Advantages and Technical Highlights
Core Advantages and Technical HighlightsDual Configuration Flexibility:
The REU615 eliminates the need for multiple specialized relays through its pre-configured Standard A and Standard B architectures. Standard A handles voltage/frequency protection and load shedding, while Standard B manages transformer OLTC regulation. This adaptability allows engineers to deploy the REU615 across diverse applications without extensive custom programming, significantly reducing engineering and commissioning time.
The REU615 eliminates the need for multiple specialized relays through its pre-configured Standard A and Standard B architectures. Standard A handles voltage/frequency protection and load shedding, while Standard B manages transformer OLTC regulation. This adaptability allows engineers to deploy the REU615 across diverse applications without extensive custom programming, significantly reducing engineering and commissioning time.
Advanced IEC 61850 Integration:
Built natively on the IEC 61850 Ed. 2 platform, the REU615 supports GOOSE messaging and IEC 61850-9-2 LE for process bus communication. It also supports HSR and PRP redundancy protocols, ensuring zero recovery time in network failures. This high-speed, deterministic communication allows the REU615 to participate in distributed protection schemes, such as sending arc fault detection signals to upstream breakers via horizontal GOOSE messaging.
Built natively on the IEC 61850 Ed. 2 platform, the REU615 supports GOOSE messaging and IEC 61850-9-2 LE for process bus communication. It also supports HSR and PRP redundancy protocols, ensuring zero recovery time in network failures. This high-speed, deterministic communication allows the REU615 to participate in distributed protection schemes, such as sending arc fault detection signals to upstream breakers via horizontal GOOSE messaging.
Integrated Arc Fault Protection:
Safety and equipment preservation are paramount in metal-enclosed switchgear. The REU615 offers an optional arc fault detection module with three light detection channels. When an arc is detected, the REU615 can trip the incoming feeder breaker in milliseconds by combining the optical signal with overcurrent conditions. This selective tripping isolates faults rapidly, minimizing damage and enhancing personnel safety.
Safety and equipment preservation are paramount in metal-enclosed switchgear. The REU615 offers an optional arc fault detection module with three light detection channels. When an arc is detected, the REU615 can trip the incoming feeder breaker in milliseconds by combining the optical signal with overcurrent conditions. This selective tripping isolates faults rapidly, minimizing damage and enhancing personnel safety.
Precision Time Synchronization:
Accurate event sequencing is critical for fault analysis in distributed networks. The REU615 supports IEEE 1588 v2 Precision Time Protocol, enabling microsecond-level synchronization across the substation. Combined with its comprehensive fault recording and event logging capabilities, the REU615 provides engineers with precise, time-aligned data for post-event analysis and system optimization.
Accurate event sequencing is critical for fault analysis in distributed networks. The REU615 supports IEEE 1588 v2 Precision Time Protocol, enabling microsecond-level synchronization across the substation. Combined with its comprehensive fault recording and event logging capabilities, the REU615 provides engineers with precise, time-aligned data for post-event analysis and system optimization.
Typical Application Scenarios
Distributed Energy Resource Integration:
Modern microgrids and renewable energy installations require precise loss-of-mains (LOM) and anti-islanding protection. The REU615 is ideally suited for this role in Standard Configuration A, monitoring voltage and frequency deviations to safely disconnect distributed generators when the utility grid fails. Its integrated synchrocheck function also ensures safe reconnection, preventing out-of-phase closing that could damage generators or grid infrastructure.
Modern microgrids and renewable energy installations require precise loss-of-mains (LOM) and anti-islanding protection. The REU615 is ideally suited for this role in Standard Configuration A, monitoring voltage and frequency deviations to safely disconnect distributed generators when the utility grid fails. Its integrated synchrocheck function also ensures safe reconnection, preventing out-of-phase closing that could damage generators or grid infrastructure.
Industrial Substation Voltage Regulation:
Manufacturing facilities with sensitive processes require stable voltage levels. In Standard Configuration B, the REU615 acts as an automatic voltage regulator for transformers equipped with motorized on-load tap changers. By continuously monitoring load-side voltage and adjusting tap positions, the REU615 maintains voltage within tight tolerances, protecting expensive industrial equipment from brownouts and overvoltage conditions.
Manufacturing facilities with sensitive processes require stable voltage levels. In Standard Configuration B, the REU615 acts as an automatic voltage regulator for transformers equipped with motorized on-load tap changers. By continuously monitoring load-side voltage and adjusting tap positions, the REU615 maintains voltage within tight tolerances, protecting expensive industrial equipment from brownouts and overvoltage conditions.
Utility Distribution Feeder Protection:
Electric utilities deploying the REU615 utilize its five-stage load shedding and restoration functionality to manage grid overloads. During peak demand or generation loss, the REU615 automatically disconnects non-critical loads in a prioritized sequence. Once conditions normalize, it restores power systematically, preventing cascading failures. The optional arc fault protection further enhances safety in aging switchgear installations.
Electric utilities deploying the REU615 utilize its five-stage load shedding and restoration functionality to manage grid overloads. During peak demand or generation loss, the REU615 automatically disconnects non-critical loads in a prioritized sequence. Once conditions normalize, it restores power systematically, preventing cascading failures. The optional arc fault protection further enhances safety in aging switchgear installations.
Related Model Recommendations
Related Model RecommendationsREU611: A more compact voltage protection relay in the same Relion® 615 family, offering core voltage/frequency protection without the advanced control and regulation features of the REU615.
REV615: A dedicated capacitor bank protection relay in the 615 series, designed for H-bridge and double-Y capacitor configurations with unbalance protection.
REM615: A motor protection relay in the same series, sharing the IEC 61850 platform and PCM600 configuration tool with the REU615.
REF615: A feeder protection relay in the 615 family, providing overcurrent and earth fault protection that complements the voltage functions of the REU615.
COM600S: The substation management unit that integrates with the REU615 to form a complete IEC 61850 solution for reliable power distribution.
PCM600: ABB’s engineering and configuration tool used to program, test, and commission the REU615 relay parameters and logic.
REV615: A dedicated capacitor bank protection relay in the 615 series, designed for H-bridge and double-Y capacitor configurations with unbalance protection.
REM615: A motor protection relay in the same series, sharing the IEC 61850 platform and PCM600 configuration tool with the REU615.
REF615: A feeder protection relay in the 615 family, providing overcurrent and earth fault protection that complements the voltage functions of the REU615.
COM600S: The substation management unit that integrates with the REU615 to form a complete IEC 61850 solution for reliable power distribution.
PCM600: ABB’s engineering and configuration tool used to program, test, and commission the REU615 relay parameters and logic.
Installation, Commissioning and Maintenance Instructions
Installation Preparation:
Before installing the REU615, verify the correct standard configuration (A or B) matches your application requirements. The pluggable modular design allows for easy rack mounting, but ensure proper backplane alignment. Confirm that the IEC 61850 network topology supports the required GOOSE subscriptions and that IEEE 1588 v2 PTP grandmaster clocks are properly configured. Always follow ESD precautions when handling the REU615 modules.
Before installing the REU615, verify the correct standard configuration (A or B) matches your application requirements. The pluggable modular design allows for easy rack mounting, but ensure proper backplane alignment. Confirm that the IEC 61850 network topology supports the required GOOSE subscriptions and that IEEE 1588 v2 PTP grandmaster clocks are properly configured. Always follow ESD precautions when handling the REU615 modules.
Maintenance Suggestions:
The REU615 features built-in self-monitoring and supervision functions that continuously verify hardware and software integrity. Routine maintenance should include reviewing event logs and fault records via the local HMI or web interface. Verify that arc fault detection sensors (if installed) are clean and properly connected. Use PCM600 to perform periodic injection testing of protection functions. Keep firmware updated to maintain IEC 61850 interoperability and security compliance.
The REU615 features built-in self-monitoring and supervision functions that continuously verify hardware and software integrity. Routine maintenance should include reviewing event logs and fault records via the local HMI or web interface. Verify that arc fault detection sensors (if installed) are clean and properly connected. Use PCM600 to perform periodic injection testing of protection functions. Keep firmware updated to maintain IEC 61850 interoperability and security compliance.
