Differential protection relay
SIEMENS Smart Grid
The specific application can be chosen by parameterization. In this way an optimal adaption of the relay to the protected object can be achieved.
In addition to the differential function a backup overcurrent protection for 1 winding / star point is integrated in the relay. Optionally, a low or high-impedance restricted earth-fault protection, a negative sequence protection and a breaker failure protection can be used. With external temperature monitoring boxes (RTD-boxes) a maximum of 12 temperatures can be measured and supervised in the relay. Therefore, complete thermal supervision of a transformer is possible.
The protection relay can be parameterized for use with three-phase and single-phase transformers. In addition to this, a thermal replica is integrated for the supervision of the ohmic losses in the plant.