Siemens Reyrolle 5 7SR51 Overcurrent and Feeder Protection Numerical Relay
The Siemens Reyrolle 5 7SR51 is a numerical relay for overcurrent and feeder protection in medium voltage substations. It provides flexible protection, monitoring, and communication functions including IEC 61850 Ethernet, automatic reclosing, and directional or non-directional overcurrent and earth fault elements. User-friendly interface with LCD, tactile buttons, and programmable LEDs ensures efficient operation
Technical Specifications
Inputs/Outputs: 4 CT + 8/13/23/38 BI + 6/8/12/18 BO; optional 4 VT + 9/14/19/39 BI + 8/10/12/20 BO
Housing: Size 6 or 12, drawable design, backlit 128x128 LCD
Protection Functions: 37/37G, 46, 46BC, 49, 50/50N/50G, 50AFD, 50BF, 50GS, 50SOTF, 51/51N/51G, 51CL, 51GS, 52, 60CTS, 74TC/74CC, 79, 81HB2, 86, 87GH, 87NL
Additional Directional Functions: 21FL, 21LB, 25, 27, 32, 47, 51V, 55, 59/59Vx, 59N, 60VTS, 67/67N/67G, 78VS, 81 f>, f<, 81R df/dt
Monitoring: Primary/secondary/phase currents & voltages, frequency, power, energy, fault location, events, waveform records
Communication: IEC 60870-5-103, MODBUS-RTU, DNP 3.0, IEC 61850
Applications: Medium voltage substations, backup protection for lines, transformers, generators, motors, busbars; flexible earth fault detection, high-speed fault detection, automatic reclosing
Benefits: Multi-language support (English, Portuguese, Turkish, French, Spanish, German), compact design, low lifecycle cost, reliable operation, IEC 61850 Ed.1 & 2 with HSR/PRP/RSTP, 28 programmable tri-color LEDs
Housing: Size 6 or 12, drawable design, backlit 128x128 LCD
Protection Functions: 37/37G, 46, 46BC, 49, 50/50N/50G, 50AFD, 50BF, 50GS, 50SOTF, 51/51N/51G, 51CL, 51GS, 52, 60CTS, 74TC/74CC, 79, 81HB2, 86, 87GH, 87NL
Additional Directional Functions: 21FL, 21LB, 25, 27, 32, 47, 51V, 55, 59/59Vx, 59N, 60VTS, 67/67N/67G, 78VS, 81 f>, f<, 81R df/dt
Monitoring: Primary/secondary/phase currents & voltages, frequency, power, energy, fault location, events, waveform records
Communication: IEC 60870-5-103, MODBUS-RTU, DNP 3.0, IEC 61850
Applications: Medium voltage substations, backup protection for lines, transformers, generators, motors, busbars; flexible earth fault detection, high-speed fault detection, automatic reclosing
Benefits: Multi-language support (English, Portuguese, Turkish, French, Spanish, German), compact design, low lifecycle cost, reliable operation, IEC 61850 Ed.1 & 2 with HSR/PRP/RSTP, 28 programmable tri-color LEDs
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