REB670  Busbar protection REB670 Relion 670 series

The REB670 IED continues ABB’s strong track record in busbar protection, starting from analog busbar protection relays INX2/5, RADSS, REB 101/103. So far, these relays have been successfully installed for over 40 years. ABB also has more than 10 years of experience of numerical busbar protection based on REB500 and RED521. All these devices have shown an impressive track record with no false operation due to incorrect IED functioning. Today, more than 20 000 zones equipped with ABB busbar protection are in service throughout the world.

REB670 is fast and stable simultaneously – such a unique combination is essential for effective busbar protection. This IED features extremely short operate time, typically 12 ms, for most internal faults, regardless of the number of connected feeders. At the same time, it maintains complete stability for external faults, even when heavy CT saturation occurs. It also has very low CT requirements compared to other numerical differential protection devices due to its unique measuring principle, which allows the sharing of CT circuits with other protection relays and thus saves costs. The low CT requirements guarantee stability and correct operation as long as the CT is not saturated for at least two milliseconds during each power system cycle. Furthermore, the REB670 provides superior sensitivity to internal faults, thus protecting your power system objects from extensive damage and long repair times. Additionally, it effectively recognizes and operates correctly for all types of evolving faults.