ABB REJ603BB401NN3XE REJ603 Self-Powered Feeder Protection

Brand	ABB
Model	REJ603BB401NN3XE REJ603

Introduction:

REJ603 relay is intended to be used for the selective short-circuit and earth-fault protection of feeders in secondary distribution networks and for protection of transformers in utilities and industries. The relay is a selfpowered Numerical relay, which does not require external auxiliary supply voltage, making it an ideal choice for installation even in remote locations where auxiliary supplies are not available. The relay derives power for its operation from the current transformers. REJ603 is primarily used in Ring Main Units ( RMU ) within distribution network.

Relay provides earth current measurement through internal calculation or has the provision for measuring it from the external core balance current transformer (CBCT).

The key features of the relay are:

Self-powered three phase non-directional overcurrent and earth-fault
protection with DMT and IDMT characteristics
Dual mode of earth fault measurement – internal vector summation
or external CBCT input
Integrated IDMT curves (IEC and Special) in a single product to
cover time co-ordination needs of secondary distribution protection
Protection blocking by second harmonic measurement for stability
during magnetizing inrush of transformers
Capacitor discharge impulse output for low energy trip coil
Built-in hand-reset electromagnetic flag for trip indication
Easy setting by DIP switches, protected by a transparent cover
Compact design and mounting arrangement suitable for Ring Main
Unit (RMU) / secondary switchgear applications
Test facility for testing entire scheme including primary CT, relay
and trip coil
Signal output for trip indication to external system

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