ABB REU615E_D HBUAEAADNCA1BNN1XD｜Voltage Protection and Control Relay｜

ABB REU615 is a voltage protection and control relay belonging to the ABB Relion 615 series. It is designed for voltage, frequency, and transformer voltage regulation applications in utility, industrial, and distribution power networks.

Product Purpose and Application

The REU615 is available in two standard configurations:

Configuration Primary Application Typical Use
Configuration A Voltage and frequency protection Utility networks, industrial power systems, distribution networks, and systems with distributed generation
Configuration B Automatic voltage regulation Power transformers equipped with on-load tap changers (OLTC)

Both configurations provide additional functions for:

Circuit breaker control
Electrical measurements
System supervision
Monitoring and diagnostic functions
Key Functional Features
1. Voltage Protection Functions

The REU615 provides comprehensive voltage-based protection functions, including:

Overvoltage protection
Undervoltage protection
Residual voltage protection
Positive-sequence voltage protection
Negative-sequence voltage protection
Voltage unbalance monitoring

These functions support protection of:

Distribution feeders
Generators connected to distribution networks
Transformers
Industrial electrical systems
2. Frequency Protection

The relay supports frequency-based protection schemes, including:

Underfrequency protection
Overfrequency protection
Frequency supervision

Typical applications include:

Load shedding schemes
Distributed generation protection
Grid stability applications
Islanding detection
3. Automatic Voltage Regulation (Configuration B)

The B configuration is optimized for transformer voltage control applications.

Functions include:

Automatic tap changer control
Voltage setpoint regulation
Tap position monitoring
Transformer voltage supervision
Control logic for OLTC operation

This allows the relay to maintain stable secondary voltage levels under changing load conditions.

Communication and IEC 61850 Integration

The REU615 was engineered specifically to utilize the capabilities of the IEC 61850 communication standard.

Supported communication protocols include:

Protocol Application
IEC 61850 Edition 2 Modern substation automation communication
IEC 61850-9-2 LE Process Bus Digital measurement communication
IEC 60870-5-103 Legacy protection communication
Modbus® Industrial automation integration
DNP3 Utility SCADA communication
PROFIBUS DPV1 Available through SPA-ZC 302 protocol converter

IEC 61850 support enables:

Peer-to-peer communication
GOOSE messaging
Interoperability between protection devices
Reduced hardwiring requirements
Integration into modern digital substations
Hardware Design Features

The REU615 belongs to the compact 615 series relay platform featuring:

Compact Withdrawable Design

Advantages include:

Easy installation and replacement
Reduced maintenance downtime
Simplified testing procedures
Improved lifecycle management
Modular Engineering Concept

The relay supports:

Flexible hardware selection
Application-specific configuration
Multiple communication options
Integration with ABB substation automation systems
Engineering and Commissioning Benefits

After selecting the appropriate standard configuration and applying application-specific settings, the REU615 can be commissioned directly into operation.

Benefits:

Reduced engineering time
Simplified configuration
Standardized protection schemes
Lower commissioning effort

Configuration and parameterization are typically performed using ABB engineering tools such as ABB PCM600.

Typical Applications
Application REU615 Function
Distribution substations Voltage and frequency protection
Industrial power networks System voltage supervision
Renewable energy connection points Grid voltage/frequency protection
Transformer substations OLTC voltage regulation
Smart substations IEC 61850-based automation
Procurement and Lifecycle Considerations

For replacement or retrofit projects, the REU615 should be evaluated based on:

Existing IEC 61850 network architecture
Required communication protocol compatibility
Current transformer (CT) and voltage transformer (VT) interface requirements
Existing ABB Relion 615 series engineering environment
Required protection configuration (A or B)

The withdrawable 615-series design provides advantages for spare management and field replacement because identical hardware platforms can support multiple protection applications through software configuration.

ABB REU615 is a compact multifunction voltage protection and control IED designed for modern utility and industrial power systems. Configuration A focuses on voltage and frequency protection, while Configuration B provides transformer automatic voltage regulation with OLTC control. With IEC 61850 Edition 2, process bus support, multiple legacy protocols, and a withdrawable design, the REU615 is suitable for digital substations, distribution automation, and industrial electrical protection applications.