ABB Voltage Relay REU 610

Voltage Relay REU610 (Discontinued in 2017)

Overview:

The REU610 is a compact voltage relay used for system voltage protection, measurement, and supervision in utility and industrial power systems. Part of ABB’s Relion® 610 product series, it provides comprehensive protection for a range of applications, including feeder, motor, busbar, power transformer, and capacitor bank protection.

The plug-in design allows for easy and safe commissioning, facilitating quick installation, maintenance, and withdrawal of units. While no longer an active product since 2017, it remains in use in many facilities and is suitable for both new and retrofit installations.

Applications:

• Busbar over-voltage and under-voltage protection for distribution substations.
• Feeder and power transformer over-voltage protection.
• Motor under-voltage protection.
• Capacitor bank protection and supervision.
• Isolated neutral power systems: Provides non-discriminative earth-fault protection via residual voltage measurement.
• Islanding: Used to disconnect small power units from the public network, for example, when islanding is required.
• Automatic substation busbar changeover.

Scope:

• Voltage protection relay for system voltage protection and supervision.

Product Benefits:

• Compact Design: Ideal for new installations and retrofits, offering flexibility in various environments.
• Removable Plug-In Design: Simplifies routine maintenance, allowing quick and easy insertion or withdrawal of the relay without downtime.
• Type Tested and Certified: Certified by KEMA for performance and reliability.
• Marine and Offshore Certification: Certified for marine use by Det Norske Veritas (DNV), making it suitable for offshore and marine applications.

Product Features:

1. Integrated Protection Functions:

   • Two-Stage Overvoltage Protection: Protects against system overvoltage conditions.
   • Two-Stage Undervoltage Protection: Provides protection for under-voltage scenarios in the system.
   • Two-Stage Residual Overvoltage Protection: Offers protection based on residual voltage measurements, ensuring system stability.

2. Exclusive Protection Functions:

   • Choose between single-stage negative phase-sequence overvoltage protection or single-stage positive phase-sequence undervoltage protection, depending on application requirements.

3. Communication Protocol Support:

   • Supports a wide array of industry-standard communication protocols, including:
     • IEC 61850
     • IEC 60870-5-103
     • Modbus®
     • Profibus
     • DNP3
     • SPA
     • LON
   • This ensures seamless integration into substation automation systems and interoperability with different vendor equipment.

Key Applications:

• Voltage supervision and protection in utility distribution and industrial power systems.
• Busbar protection in distribution substations.
• Motor protection for under-voltage conditions.
• Capacitor bank protection in power systems.
• Isolated neutral system earth-fault protection through residual voltage monitoring.

The REU610 offers a reliable and versatile solution for voltage protection, combining various protection functions in a compact, easy-to-maintain design. Despite being discontinued in 2017, it remains relevant for many existing installations and continues to provide robust protection and supervision capabilities.