OVERVIEW

The REF601/REJ601 are specialized feeder protection relays for the protection of utility substations and industrial power systems in primary and secondary distribution networks.

Similarly, the REM601 is a specialized motor protection relay for the protection of medium and low voltage asynchronous motors in manufacturing and process industries.

The REF601/REJ601/REM601 is a member of the ABB Relion® product family, belonging to the 605 series.

The relays optimize the combination of protection, monitoring and control functions in a single unit.

It offers best-in-class performance and availability and is based on ABB’s in-depth knowledge of protection and digital technology.

Common features of the REF601/REJ601/REM601 include

 Compact and easy to use

 Standard 1A or 5A CT input for phase current measurement

 Alternate sensor input to support phase current measurements

 Measurement of earth current internally or externally via the CBCT

 Local and remote control of circuit breakers

 Trip circuit monitoring and relay internal monitoring

 Lockout function

 100 event records with date and time stamps

 Five analog fault records

 Non-resettable trip counter

 Primary on-line current measurement

 Comprehensive local HMI

 Universal auxiliary power supply

 Optional MODBUS RTU or IEC 60870-5-103 communication

 Non-volatile memory for setup and fault logging

 User-selectable nominal frequency 50 / 60 Hz

 Configurable binary input, output, and alarm LED indicators

 Local HMI with multi-language support

 Two setup groups

Protection features of the REF601/REJ601 include

 Three levels of overcurrent protection

 Two levels of ground fault protection

 Surge detection for stability during transformer charging

 Thermal overload protection

 Negative sequence overcurrent

 Phase discontinuity protection

 Circuit breaker fault protection

 Multi-shot automatic recloser function for overhead lines