IMR7991 / IMR7992 – Overcurrent Protections with Control
Products family : Feeder 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 information.
The IMR 7991 gathers in a single unit the Protection, Instrumentation, Control and Communication functions, useful in distribution substations.
The setting change fromincomer mode toward outgoing mode is done either by a direction change of the measured active power or by a dedicated input. In the outgoing mode, the relay provides a high resistance earth fault protection using the PTR dependent time element.
ANSI codes
50 – Instantaneous overcurrent
51 – Overcurrent
51N – Earth fault overcurrent
67N – Earth directional overcurrent
79 – Recloser