Siemens Reyrolle 7SR224 Directional Overcurrent Protection Relay – 4xI, 4xV
The Siemens Reyrolle 7SR224 is a directional overcurrent and earth fault protection relay designed for three-phase systems and typically used as an integral controller for pole-mounted reclosers. Equipped with four current and four voltage inputs and housed in E10 cases, it provides flexible current and time grading, integrated logic, and optional auto-reclose functionality for overhead line feeders. Protection, monitoring, and metering are accessible via front USB for local connection and RS485 rear port for remote SCADA integration
Technical Specifications
Inputs: 4xI, 4xV
Flexible current and time grading for all overcurrent protection types
Auto-reclose option for OHL feeders
Protection Functions: Undercurrent (37), Broken Conductor (46BC), Negative Phase Sequence Overcurrent (46NPS), Thermal Overload (49), Overcurrent (50,51), Earth Fault (50G,50SEF,51G,51SEF), High Impedance REF (64H), Under/Over Voltage (27/59), Negative Phase Sequence Voltage (47), Voltage Controlled Overcurrent (51V), Neutral Voltage Displacement (59N), Directional Control of Overcurrent & Earth Fault (67)
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 & Earth, Line & Phase Voltages, Apparent Power & Power Factor, Real & Reactive Power, Wh & VArh Forward/Reverse, Historical Demand Records, PPS/NPS/ZPS Voltages & Currents
Suitable for distribution, industrial, and utility applications
Flexible current and time grading for all overcurrent protection types
Auto-reclose option for OHL feeders
Protection Functions: Undercurrent (37), Broken Conductor (46BC), Negative Phase Sequence Overcurrent (46NPS), Thermal Overload (49), Overcurrent (50,51), Earth Fault (50G,50SEF,51G,51SEF), High Impedance REF (64H), Under/Over Voltage (27/59), Negative Phase Sequence Voltage (47), Voltage Controlled Overcurrent (51V), Neutral Voltage Displacement (59N), Directional Control of Overcurrent & Earth Fault (67)
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 & Earth, Line & Phase Voltages, Apparent Power & Power Factor, Real & Reactive Power, Wh & VArh Forward/Reverse, Historical Demand Records, PPS/NPS/ZPS Voltages & Currents
Suitable for distribution, industrial, and utility applications
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