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Overview
The Hitachi Energy REU615 is a member of the renowned Relion® product family, specifically engineered for feeder applications. This numerical protection unit delivers a complete solution for safeguarding electrical feeders against various fault conditions while providing extensive control and monitoring features to enhance grid reliability and operational efficiency.

Key Features & Benefits:

• Comprehensive Protection Suite: Includes definitive time, inverse time, and directional overcurrent protection (50, 51, 67), earth-fault protection (50N/51N, 67N), auto-reclosing function (79), and thermal overload protection (49) for transformers and cables.

• Advanced Control Logic: Features a powerful and flexible configurable logic (CFG) editor, allowing users to create custom control sequences, interlocking schemes, and automation functions without additional hardware.

• IEC 61850 Ed.2 Support: Native support for modern substation communication standards including IEC 61850 (MMS and GOOSE), IEC 60870-5-103/104, DNP3, and Modbus, ensuring seamless integration into digital substations and SCADA systems.

• Disturbance Recording: High-resolution fault records and event logging capabilities for detailed post-event analysis and system troubleshooting.

• Compact and Robust Design: Designed for high reliability in harsh substation environments, with a wide operating temperature range and high immunity to electromagnetic interference.

Technical Specifications:

• Product Family: Relion® 615 Series

• Application: Feeder Protection and Control

• Protection Functions: Overcurrent (directional/non-directional), Earth-fault (directional/non-directional), Auto-reclosing, Thermal overload, etc.

• Communication Protocols: IEC 61850, DNP3, Modbus, IEC 60870-5-103/104

• I/O Capacity: Configurable number of binary inputs and outputs.

• Power Supply: Available in a range of DC and AC voltages.

Typical Applications:

• Protection and control of medium-voltage overhead lines and underground cables in utility distribution networks.

• Incoming and outgoing feeder protection in industrial plants and commercial facilities.

• Main protection for distribution transformers.

• Integration into automated distribution management systems.