Siemens Reyrolle 7SR18 Numerical Relay – Line Differential Protection Relay

Protection Functions: ، Three-phase, phase-segregated current differential protection ، Overcurrent protection ، Earth fault protection ، Supervision Functions: ، Protection communications link supervision ، Circuit Breaker Fail (50BF) ، CT Supervision (60CTS) ، Trip Circuit Supervision (74T/CCS) ، Control Functions: ، Intertripping ، Monitoring Functions: ، Primary/Secondary Current Phases and Earth ، Historical Demand Record ، Features: ، Four current inputs in E6 housing ، Integrated logic for optimal configuration with analogue and binary I/O ، Access via front USB, RS485, and optional IEC 61850 rear ports ، CT ratio correction, four setting groups, password protection, self-monitoring ، Circuit Breaker Trip Counter, fault/event/waveform records ، Applications: Total protection for distribution and industrial systems, from overcurrent to auxiliary and trip relays.