Siemens Reyrolle 7SR220 Directional Overcurrent Protection Relay
The Siemens Reyrolle 7SR220 is a directional overcurrent and earth fault protection relay designed for interconnected systems where fault current may flow in either direction. Equipped with five current and four voltage inputs and housed in E6/E8 cases, it offers flexible protection, metering, and instrumentation functionality. Integrated logic and optional auto-reclose features enable optimal configuration and use on overhead line feeders. Connectivity is provided via front USB for local PC and rear RS485 for remote SCADA integration
Technical Specifications
Five current (I) and four voltage (V) inputs
Flexible current and time grading for all overcurrent protection types
Optional auto-reclose for OHL feeders
Cold load settings, four setting groups, password protection (2 levels)
User programmable logic, self-monitoring, breaker trip counter and timer
Fault, event, and waveform records
Protection Functions: Undercurrent (37), Broken Conductor (46BC), Negative Phase Sequence Overcurrent (46NPS), Thermal Overload (49), Overcurrent (50,51), Earth Fault (50G,50N,50SEF,51G,51N,51SEF), Directional Control (67), High Impedance REF (64H), Under/Over Voltage (27/59), Negative Phase Sequence Voltage (47), Voltage Controlled Overcurrent (51V), Neutral Voltage Displacement (59N), Under/Over Frequency (81)
Supervision Functions: CT Supervision (60CTS), Trip & Close Circuit Supervision (74T/CCS), VT Supervision (60VTS), Inrush Detector (81HBL2), Circuit Breaker Fail (50BF)
Control Functions: Auto Reclose (79)
Monitoring Functions: Primary/Secondary Current Phases and Earth, Line and Phase Voltages, Apparent Power & Power Factor, Real & Reactive Power, Wh & VArh Forward/Reverse, Historical Demand Records, PPS/NPS/ZPS Voltages & Currents
Flexible current and time grading for all overcurrent protection types
Optional auto-reclose for OHL feeders
Cold load settings, four setting groups, password protection (2 levels)
User programmable logic, self-monitoring, breaker trip counter and timer
Fault, event, and waveform records
Protection Functions: Undercurrent (37), Broken Conductor (46BC), Negative Phase Sequence Overcurrent (46NPS), Thermal Overload (49), Overcurrent (50,51), Earth Fault (50G,50N,50SEF,51G,51N,51SEF), Directional Control (67), High Impedance REF (64H), Under/Over Voltage (27/59), Negative Phase Sequence Voltage (47), Voltage Controlled Overcurrent (51V), Neutral Voltage Displacement (59N), Under/Over Frequency (81)
Supervision Functions: CT Supervision (60CTS), Trip & Close Circuit Supervision (74T/CCS), VT Supervision (60VTS), Inrush Detector (81HBL2), Circuit Breaker Fail (50BF)
Control Functions: Auto Reclose (79)
Monitoring Functions: Primary/Secondary Current Phases and Earth, Line and Phase Voltages, Apparent Power & Power Factor, Real & Reactive Power, Wh & VArh Forward/Reverse, Historical Demand Records, PPS/NPS/ZPS Voltages & Currents
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