ABB REG615 Generator Protection Relay

Product Overview

The REG615 is a dedicated generator protection and interconnection relay from ABB’s world-renowned Relion® 615 series. Specifically engineered for synchronous generators and distributed energy resource (DER) interconnection points, it provides a "Total Protection" suite that integrates measurement, control, and supervision into a single compact device. Whether managing a traditional industrial power plant or a modern solar/wind farm, the REG615 ensures grid stability by detecting abnormal conditions—such as loss of field or stator ground faults—and executing high-speed isolation. Its modular, plug-and-play design and native support for advanced communication protocols make it a cornerstone for resilient, "Smart Grid" ready power systems.

Technical Specifications

• Model Designation: REG615

• Product Series: Relion® 615

• Core Protection Functions:

• Generator Differential Protection

• Loss of Field (Excitation) Protection

• Reverse Power and Low Power Protection

• Stator Ground Fault Protection

• Frequency Protection (Over/Under and Rate of Change/df/dt)

• Directional and Non-Directional Overcurrent

• Synchronization Check (Synchrocheck)

• Communication Protocols: IEC 61850 (Ed. 1 & 2), GOOSE messaging, Modbus®, DNP3, and IEC 60870-5-103

• Process Bus Support: IEC 61850-9-2 LE for sampled values

• Network Redundancy: PRP (Parallel Redundancy) and HSR (High-availability Seamless Redundancy)

• Time Synchronization: IEEE 1588 v2 High-Precision Timing

• User Interface: Local LCD HMI with single-line diagram (SLD) editing and Web-based access

• Installation: Modular, draw-out design for rapid maintenance and testing

Generator Safety and Grid Interconnection

The REG615 is a dual-purpose powerhouse. In Generator Mode, it acts as the primary sentinel for the machine's health, using differential logic to identify internal winding faults that could lead to catastrophic mechanical failure. In Interconnection Mode, the relay focuses on "Islanding Detection" and grid synchronization. If a fault occurs on the utility grid, the REG615 ensures the distributed energy source is safely disconnected to prevent hazardous unsynchronized reclosing, while maintaining the stability of the local network. This dual-role capability makes it essential for facilities looking to balance self-generation with utility grid connectivity.