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Overview
The Hitachi Energy REC650 is a sophisticated member of the Relion® product family, specifically engineered for the protection of power lines. Its core functionality is based on current differential protection, which provides absolute selectivity and high-speed clearing of faults within the protected line section, making it an ideal choice for critical transmission and distribution assets.

Key Features & Benefits:

• Current Differential Protection (87L): Provides the primary protection scheme, offering high-speed and selective fault clearance for internal line faults. It is inherently immune to power swings and load currents.

• Backup Protection Functions: Includes distance protection (21) and directional overcurrent protection (67) as backup schemes, ensuring system reliability even under communication channel failure.

• Integrated Communication Interfaces: Equipped with multiple communication options, including synchronous optical fiber (IEC 61850-9-2 LE Sampled Values, GOOSE) and other protocols for seamless peer-to-peer data exchange between line ends.

• Advanced Fault Analysis: Features detailed disturbance recording and event logging for precise post-fault analysis and system monitoring.

• Cybersecurity Features: Incorporates modern cybersecurity standards to protect the integrity of protection and control systems.

Technical Specifications:

• Product Family: Relion® 650 Series

• Application: Line Differential Protection

• Primary Protection: Current Differential Protection (87L)

• Backup Protection: Distance Protection (21), Directional Overcurrent Protection (67)

• Communication: Support for IEC 61850 (GOOSE, Sampled Values), PCM for differential channel

• Standard Compliance: Meets relevant IEC and IEEE standards

Typical Applications:

• Protection of short and medium-length transmission lines

• Distribution lines in meshed networks

• Tie-line protection in industrial power systems

• Lines where communication channels (e.g., optical fiber) are available

Note: For complete technical specifications, application guidelines, and setting instructions, please refer to the official Hitachi Energy REC650 documentation. Proper configuration requires expertise in power system protection and communication schemes.