RMSR7991 / RMSR7992 – Current Relays with Recloser

Products family : Feeder Protection, Current Protection

Sector : Industry

The optimum operation of an electrical network depends particularly on the reliability and the availability of the protection, measuring and automation devices, and the way these devices can communicate their informations.

RMSR 7900 relays provide protection of three-phase electrical distribution networks against any kind of short circuit between phases or between phase and earth.

– RMSR 7991 meets the technical requirements of radial outgoing feeder protection in distribution networks. To complement the traditional three-phase overcurrent protection, RMSR 7991 features a sensitive earth-fault unit and integrates a recloser.

– RMSR 7992 is specially designed to protect incoming feeders in distribution system substations. In combination with RMSR 7991, it increases the security in an electrical substation: it can reduce the operating time for a fault on the bus-bars and provide fast backup protection, in case of failure of a downstream circuit-breaker.

ANSI codes
50 – Instantaneous overcurrent
50N – Instantaneous earth fault overcurrent
51 – Overcurrent
51N – Earth fault overcurrent
67N – Earth directional overcurrent
79 – Recloser