Supervision

To ensure continuous availability of protection, self-supervision of the relay hardware and software is incorporated. The

REF601/REJ601 and REM601 also include an integrated trip-circuit monitoring function which monitors the external trip

signal path. A built-in test mode which enables users to test the relay HMI, protection functions, and binary outputs.

The 605 series relays can store 100 events with time stamps at a resolution of 1 ms.

They can also store analog fault records for the last five trip events.

This data is stored in non-volatile memory.

The optional communication card extends local monitoring and control facility of the HMI to remote automation systems over

MODBUS RTU / IEC 60870-5-103 protocol.

Sensor support

These relays support both conventional CTs and Rogowski current sensors.

The sensor option helps to obtain equipment size reduction, performance improvement and better standardization in compact MV switchgear.