Product Overview

The REB670 is a high-performance differential protection IED (Intelligent Electronic Device) designed for the comprehensive safeguarding of busbars, T-connections, and meshed corners. Part of the ABB Relion® 670 series, this module delivers rapid and selective fault detection to maintain the stability of high-voltage power networks. It is engineered to handle complex switching scenarios with high sensitivity, providing a reliable defense against internal faults while remaining stable during external through-faults. Its Swedish-engineered architecture ensures that critical infrastructure stays online by minimizing downtime through advanced diagnostics and sub-cycle tripping capabilities.

Critical Performance Metrics and Hardware Attributes

• Differential protection operative range spans from 0.2 to 40 times the rated current.

• Exceptional thermal capacity with a 1-second overload rating of 100 times Ir.

• Analog input versatility supporting 4-20 mA, 0-10 mA, and ±20 mA ranges.

• Low burden design with power consumption typically at 50 W.

• Robust insulation with a continuous voltage overload rating of 420 V.

Operational Scenarios and Network Integration

This module is the industry standard for protecting varied substation topologies, ranging from simple single-bus configurations to complex one-and-a-half circuit breaker stations. It is specifically utilized in transmission-level substations where the integrity of the busbar is critical to the entire regional grid. The REB670 is equally effective in double busbar systems with or without transfer buses, ensuring that maintenance or bypass operations do not compromise the protection zone. Its fast Ethernet communication via fiber optics allows it to integrate seamlessly into modern digital substations, supporting peer-to-peer data exchange for coordinated protection and control across the facility.

FAQ

Q: What is the primary advantage of the REB670’s differential protection algorithm?

A: The algorithm is designed for extreme speed and selectivity, allowing it to distinguish between internal busbar faults and external faults within milliseconds, which prevents unnecessary widespread blackouts.

Q: Can this protection module be used in substations with varying auxiliary power voltages?

A: Yes, the REB670 features a flexible power supply unit that accommodates two broad ranges: 24-60 V DC for lower voltage environments or 90-250 V DC/AC for standard utility power.

Q: Does the REB670 support digital communication for Smart Grid applications?

A: Absolutely. It utilizes the IEEE 802.3u 100BASE-FX standard with ST optical connectors, enabling high-speed 100 Mbit/s communication for substation automation and remote monitoring.

Q: How does the unit handle high current surges during a major fault?

A: The unit is built for ruggedness, supporting a short-term current overload of up to 100 times its rated current for one second, ensuring it remains operational during the most severe grid disturbances.

Q: Is this module compatible with both 50Hz and 60Hz power systems?

A: The hardware is frequency-flexible, supporting both 50 and 60 Hz systems with a tolerance of ±5%, making it suitable for global deployment in different power markets.