Overview

The ABB REQ650 is a dedicated breaker protection relay that ensures fast and reliable backup tripping in case of breaker failure. It is engineered for high-voltage substations and industrial power systems where selective fault isolation is critical. Moreover, the REQ650 supports re-tripping of its own breaker and tripping of adjacent breakers to maintain system stability. Its ready-made configuration and reduced parameter settings simplify commissioning and reduce engineering time. In addition, the device features dynamic LEDs, graphical display, and remote access capabilities for enhanced usability and diagnostics.

Technical Data / Specifications

Typical Applications 

The REQ650 is widely used in substations for local backup protection of circuit breakers. It ensures that faults are isolated quickly if a primary breaker fails to operate, preventing cascading outages. For instance, utilities deploy REQ650 in transmission and distribution substations to enhance system reliability. In addition, it integrates seamlessly with ABB’s substation automation systems and SCADA platforms via IEC 61850. Its modular design and flexible logic functions make it ideal for retrofit projects and new installations alike.

FAQ

Q: What is the main function of the REQ650 relay?

A: It provides high-speed breaker failure protection, including backup tripping and re-tripping capabilities.

Q: Is the REQ650 compatible with IEC 61850?

A: Yes, it supports IEC 61850 along with Modbus, DNP3, and SPA protocols for communication.

Q: Can this relay be used in retrofit projects?

A: Absolutely. Its modular design and pre-configured templates make it ideal for replacing older protection devices.

Q: What software is used to configure the REQ650?

A: ABB’s PCM600 software is used for configuration, diagnostics, and firmware updates.

Q: What industries typically use this relay?

A: It is commonly used in power utilities, transmission networks, and industrial substations.