ABB REJ601 Application Overcurrent/Feeder protection

The recorded information can be accessed locally via the user interface on the relay front

panel and can be uploaded for subsequent fault analysis. 

Self-supervision and test function 

The relay’s built-in self-supervision system continuously monitors the state of the relay hardware and the operation of the relay software. 

Any fault or malfunction detected will signal an alert for the operator. 

A permanent relay fault will block the protection functions of the relay to prevent incorrect relay operation. 

The relays support a built-in test mode which enables the user to test the relay HMI and binary outputs.

Trip-circuit monitoring

The trip-circuit monitoring continuously monitors the availability and operability of the trip circuit. 

It provides open-circuit monitoring both when the circuit breaker is in its closed and in its open position. 

It also detects loss of circuit-breaker control voltage.

Access control 

To protect from unauthorized access and to maintain the integrity of information, the relays are armed with a three level, 

role-based user authentication system with individual passwords for operator, engineer and administrator levels. 

There are two alternative password protection options. 

The default is a combination of different navigation keys. 

The alternative is an alpha-numeric password. 

The user can select the password option based on their requirement.