REB670  Busbar protection Relion® 670 series

The REB670 IED (Intelligent Electronic Device) features
excellent application flexibility. It is designed for the
protection and monitoring of busbars, T-connections and
meshed corners from medium to extra high voltage levels.
Due to its extensive I/O capability, REB670 protects
single and double busbars with or without transfer bus,
double circuit breaker or one-and-half circuit breaker
arrangements.
The REB670 IED provides selective, reliable and fast fault clearance for all types of internal phase-to-phase

and phase-toearth faults in solidly earthed or low impedance earthed power
systems. It can also handle all internal multi-phase faults in
isolated or high-impedance earthed power systems.
REB670 features complete busbar protection, which in addition to differential protection includes flexible dynamic zone
selection (disconnector replica) integrated in one IED. This
enables dynamic CT connections to differential zones, as well
as selective busbar and breaker failure tripping, disconnector and circuit breaker status supervision. Due to its unique
measuring principle, this IED has very low CT requirements
compared to other numerical differential protection devices.

REB670

In-depth busbar protection knowledge
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.