Siemens 7SR120 Directional Overcurrent Protection Relay | Reyrolle
The Siemens 7SR120 is a directional overcurrent protection relay designed for feeders, interconnectors, and plant equipment like transformers. It allows highly flexible settings for current and time grading, providing both main and backup protection. With integrated logic, analog and binary inputs/outputs, and communication options (USB, RS485, IEC61850), it ensures reliable operation in interconnected power systems
Technical Specifications
Single and four pole variants (E4 case); IEC61850 option (E6 case)
Flexible current and time grading settings
Integrated programmable logic
Protection functions: Undercurrent (37), Broken Conductor (46BC), NPS Overcurrent (46NPS), Thermal Overload (49), Overcurrent (50/51), Earth Fault (50G/50N/50SEF/51G/51N/51SEF), Directional OC & EF (67), High Impedance REF (64H), Under/Over Voltage (27/59), Voltage-Controlled OC (51V), Neutral Voltage Displacement (59N)
Supervision: CT (60CTS), VT (60VTS), Trip & Close Circuits (74T/CCS), Inrush Detector (81HBL2), Circuit Breaker Fail (50BF)
Control: Auto Reclose (79)
Monitoring: Currents, voltages, power, energy (Wh, VArh), PPS/NPS/ZPS, historical demand records
Data communications for protection, instrumentation, and metering
Flexible current and time grading settings
Integrated programmable logic
Protection functions: Undercurrent (37), Broken Conductor (46BC), NPS Overcurrent (46NPS), Thermal Overload (49), Overcurrent (50/51), Earth Fault (50G/50N/50SEF/51G/51N/51SEF), Directional OC & EF (67), High Impedance REF (64H), Under/Over Voltage (27/59), Voltage-Controlled OC (51V), Neutral Voltage Displacement (59N)
Supervision: CT (60CTS), VT (60VTS), Trip & Close Circuits (74T/CCS), Inrush Detector (81HBL2), Circuit Breaker Fail (50BF)
Control: Auto Reclose (79)
Monitoring: Currents, voltages, power, energy (Wh, VArh), PPS/NPS/ZPS, historical demand records
Data communications for protection, instrumentation, and metering
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