ABB - REM545BM223AAAA REM545 MACHINE PROTECTION RELAY

The REM 545 machine terminals are used as the main protection system of generator and generator-transformer units in small and medium-power diesel, hydroelectric and steam power plants. The protection for large and/or important MV synchronous and asynchronous motors used, for example, in pumps, mills and crushers during start-up and normal run forms another application area.

The protection functions of REM 545 are designed for selective short-circuit and earth-fault protection of rotating machines. Unlike most other power system components, rotating machines also need protection against abnormal operating conditions such as over-current, unbalanced load, over-temperature, over-voltage, over and under-excitation, under-impedance, over- and under-frequency and generator motoring. For motor protection start-up supervision, there are also stall protection and cumulative start-up counter features.