ABB REU615 HBUAEAADANB6ANN1XG Voltage Protection and Control Relay

Overview

The ABB REU615 HBUAEAADANB6ANN1XG is a voltage protection and control relay (IED – Intelligent Electronic Device) from ABB’s Relion® 615 series. It is designed for medium-voltage and low-voltage power system protection, monitoring, and control, especially in distribution networks and industrial power plants.

This device is part of ABB’s modern IEC 61850-based substation automation ecosystem, combining protection, measurement, control, and communication in a single compact unit.

Main Function

The REU615 is primarily used for:

• Voltage and frequency protection
• Automatic voltage regulation (AVR support in certain configurations)
• Circuit breaker control and supervision
• Load shedding and grid stability functions
• Power quality and measurement monitoring
• Communication with SCADA/DCS systems

In practical terms, it acts as a smart protection controller for electrical distribution systems, ensuring stable voltage conditions and preventing abnormal grid operation.

Technical Specifications

Key Features

• Compact digital protection relay with high integration level
• Supports IEC 61850 station bus communication
• Configurable protection and control logic via ABB PCM600
• Dual configuration support (voltage protection or AVR-based applications depending on setup)
• High-speed fault detection and trip output
• Built-in disturbance recording and event logging
• Strong cybersecurity and access control features in modern firmware versions

Internal Structure & Design

The REU615 is built as a modular intelligent electronic device consisting of:

• Measurement Unit – Reads voltage and frequency signals from VT inputs
• Protection Algorithms Core – Executes ANSI protection functions (27, 59, 81, etc.)
• Control Module – Manages circuit breaker and switch operations
• Communication Processor – Handles IEC 61850 and SCADA protocols
• Binary I/O Module – Interfaces with field devices (relays, breakers)
• HMI Interface – Front panel display and LEDs for status indication

​​​​​​​

Applications

This relay is widely used in:

• Medium-voltage distribution substations
• Industrial power distribution systems
• Power generation auxiliary systems
• Renewable energy grid integration (solar/wind plants)
• Transformer voltage regulation systems
• Load shedding and grid stability control systems

Installation & Maintenance

Installation Guidelines

• Installed in switchgear panels or protection cabinets
• Requires correct VT/CT wiring according to system design
• Proper grounding and shielding for IEC 61850 communication
• Configuration performed using ABB PCM600 software
• Must be commissioned by qualified protection engineers

Maintenance Recommendations

• Periodic testing of protection functions (secondary injection tests)
• Verification of event logs and disturbance records
• Firmware and configuration backup using PCM600
• Inspection of communication ports and network stability
• Ensure correct time synchronization (IEC 61850 / SNTP / IRIG-B)

Importance in Power Systems

The REU615 plays a critical role in electrical grid stability, including:

• Preventing overvoltage and undervoltage damage
• Maintaining frequency stability in distributed generation systems
• Protecting transformers and feeders
• Enabling fast fault isolation and system recovery
• Supporting smart grid and digital substation architectures

Summary

The ABB REU615 HBUAEAADANB6ANN1XG is a high-performance voltage protection and control relay used in modern electrical substations and industrial power systems. It combines protection, control, measurement, and IEC 61850 communication in a compact intelligent device.