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ABB REU615

ABB REU615 is a dedicated voltage protection, control, and automation relay within the ABB Relion® 615 series. It is designed for medium-voltage utility and industrial power distribution systems, especially applications requiring voltage supervision, frequency protection, load shedding, synchronization, and transformer voltage regulation.

REU615 is positioned as an intelligent substation protection device that bridges traditional protection functions and modern digital substation automation. It supports IEC 61850 communication, distributed control schemes, and advanced monitoring functions.

Typical product roles:

• Voltage protection IED (Intelligent Electronic Device)
• Busbar voltage monitoring relay
• Frequency protection and load shedding controller
• Transformer automatic voltage regulator interface
• Substation automation communication node

The relay is available mainly in two standard configurations:

• Configuration A: Voltage and frequency protection, synchro-check, load shedding
• Configuration B: Automatic voltage regulation for transformers with motor-driven OLTC (on-load tap changer)

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2. Product Parameters

Item	Description
Product Family	ABB Relion® 615 Series
Device Type	Voltage Protection and Control Relay
Application Voltage Level	Medium-voltage distribution networks
Protection Functions	Overvoltage, undervoltage, frequency, residual voltage, load shedding
Control Functions	Circuit breaker, disconnector, earthing switch control
Communication	IEC 61850, Modbus, DNP3, IEC 60870-5-103
Ethernet Support	IEC 61850 Edition 1 & Edition 2, HSR, PRP
Time Synchronization	IEEE 1588 v2, SNTP, IRIG-B
HMI	Local graphical LCD + Web HMI
Installation Type	Withdrawable plug-in unit design
Engineering Tool	ABB PCM600
Series Compatibility	ABB 615 protection relay platform

 

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3. Core Functions

3.1 Voltage Protection

REU615 provides comprehensive voltage-based protection functions:

• Three-phase undervoltage protection
• Three-phase overvoltage protection
• Residual overvoltage protection
• Positive-sequence undervoltage protection
• Negative-sequence overvoltage protection

These functions protect distribution networks from abnormal voltage conditions caused by faults, load changes, or grid disturbances.

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3.2 Frequency Protection

The relay supports:

• Under-frequency protection
• Over-frequency protection
• Rate-of-change-of-frequency (df/dt)

Applications include:

• Generator protection
• Grid stability monitoring
• Automatic load shedding schemes

 

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3.3 Automatic Voltage Regulation

In Configuration B, REU615 can operate as a transformer voltage regulator.

Functions include:

• OLTC tap changer control
• Voltage set-point management
• Tap position monitoring
• Automatic voltage stabilization

This allows distribution transformers to maintain stable secondary-side voltage during changing load conditions.

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3.4 Control and Automation

Integrated control functions include:

• Circuit breaker control
• Disconnector control
• Earthing switch control
• Synchronism check
• Interlocking logic

The relay can perform local and remote switching operations through HMI or communication networks.

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3.5 Disturbance Recording and Monitoring

Built-in monitoring functions:

• Fault recording
• Disturbance recorder
• Event logging
• Self-supervision
• Trip circuit supervision
• Measurement recording

These functions improve fault analysis and system diagnostics.

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4. Design Features

4.1 Compact Modular Architecture

REU615 adopts ABB's 615-series compact design:

• Space-saving relay construction
• Withdrawable plug-in unit
• Fast replacement capability
• Simplified commissioning

The plug-in structure allows maintenance personnel to remove and replace the relay module without extensive wiring work.

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4.2 IEC 61850 Digital Substation Capability

Key communication advantages:

• IEC 61850 Edition 1/2 support
• GOOSE messaging
• IEC 61850-9-2 LE process bus support
• PRP/HSR redundancy

Benefits:

• Reduced copper wiring
• Faster protection coordination
• Improved interoperability

 

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4.3 Human-Machine Interface Design

Features:

• Large graphical LCD
• Single-line diagram display
• Local control buttons
• Web-based HMI access

Operators can view:

• Voltage measurements
• Alarm information
• Breaker status
• Event records

 

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4.4 Flexible Configuration

Using ABB PCM600 engineering software:

• Logic customization
• Signal matrix editing
• Protection setting management
• Communication configuration

The relay can be adapted to different substation architectures.

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5. Hardware Composition

5.1 Main Processing Unit

Includes:

• High-performance embedded processor
• Protection algorithm execution
• Communication management
• Logic processing

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5.2 Analog Measurement Interface

Supports connection to:

• Voltage transformers (VT/PT)
• Residual voltage measurement circuits
• Current measurement inputs (depending on configuration)

Measurement functions include:

• Voltage RMS values
• Frequency measurement
• Sequence components
• Power-related calculations

 

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5.3 Binary Input / Output Module

Provides:

Inputs

• Breaker status
• Switch position feedback
• External alarms
• Protection signals

Outputs

• Trip commands
• Control commands
• Alarm outputs

Optional I/O expansion can be used for larger applications.

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5.4 Communication Interfaces

Hardware communication options:

• Ethernet RJ45
• Fiber optic Ethernet
• RS-485
• Serial interfaces

Supported protocols:

• IEC 61850
• Modbus
• DNP3
• IEC 60870-5-103

 

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5.5 Local HMI Module

Includes:

• LCD display
• Navigation keys
• Status LEDs
• Local operation interface

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6. Application Scenarios

6.1 Medium Voltage Substations

Typical use:

• 6 kV / 10 kV / 20 kV / 35 kV distribution systems
• Utility substations
• Industrial substations

Functions:

• Voltage supervision
• Network protection
• Automation control

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6.2 Transformer Voltage Regulation

Used with:

• Power transformers
• OLTC mechanisms

Provides:

• Automatic tap adjustment
• Voltage stabilization
• Remote monitoring

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6.3 Industrial Power Systems

Applications:

• Steel plants
• Mining facilities
• Oil & gas plants
• Large manufacturing plants

Benefits:

• Prevents voltage instability
• Improves equipment reliability
• Supports automated operation

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6.4 Renewable Energy Integration

Suitable for:

• Wind power plants
• Solar power stations
• Distributed generation networks

Functions:

• Frequency monitoring
• Grid stability protection
• Voltage control

 

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7. Maintenance Points

7.1 Periodic Inspection

Recommended checks:

• Relay self-supervision status
• Alarm history
• Communication status
• Protection settings
• Event records

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7.2 Protection Testing

Regular testing should include:

• Voltage protection pickup testing
• Frequency protection verification
• Trip output testing
• Synchronism check testing

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7.3 Communication Maintenance

Check:

• IEC 61850 network health
• Ethernet redundancy status
• Time synchronization accuracy
• GOOSE communication integrity

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7.4 Firmware and Configuration Management

Maintain:

• Firmware version records
• PCM600 project backups
• Protection parameter backups
• Configuration documentation

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7.5 Hardware Replacement

Advantages:

• Withdrawable design simplifies replacement
• Modular structure reduces downtime
• Settings can be restored quickly after replacement

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8. Comprehensive Evaluation

Category	Evaluation
Protection Capability	★★★★★
Communication Ability	★★★★★
Automation Integration	★★★★★
Reliability	★★★★★
Maintenance Convenience	★★★★★
Application Flexibility	★★★★☆

Overall Assessment:

ABB REU615 is a highly integrated voltage protection and control relay optimized for modern medium-voltage automation systems. Its strongest advantages are IEC 61850 digital substation compatibility, flexible protection logic, transformer voltage regulation capability, and compact modular design.

Compared with conventional voltage relays, REU615 provides much broader functionality by combining:

• Protection relay
• Automation controller
• Measurement device
• Communication gateway
• Disturbance recorder

It is particularly suitable for smart substations, industrial distribution networks, transformer regulation systems, and renewable energy grid interfaces.

Engineering Positioning:
REU615 can be considered a next-generation intelligent voltage protection IED for medium-voltage power systems, offering a balance of protection performance, digital communication capability, and lifecycle maintainability.