7SR51 Overcurrent & Feeder Protection

Siemens Reyrolle 5 7SR51 Overcurrent & Feeder Protection numerical Relay

Siemens reyrolle 5 7SR51 Overcurrent & Feeder Protection device includes a wide range of protection functions and IEC 61850 Ethernet communications as standard. To further minimize the product variants the power supply and the binary inputs cover the full operating range with configurable binary input thresholds.

Reyrolle 7SR51 Overcurrent Protection Relay Features

The Reyrolle 5 is designed for the electricity networks of the future with enhanced communications and cybersecurity

while maintaining a user-friendly interface and easy product management.

The Reyrolle 7SR511 overcurrent device includes a wide range of protection functions and IEC 61850 Ethernet communications as standard. To further minimize the product variants the power supply and the binary inputs cover the full operating range with configurable binary input thresholds.

The large LCD, tactile pushbuttons and programmable LEDs provide a user-friendly product interface and the relay element is withdrawable for easy replacement.

Siemens Reyrolle 5 7SR51 Inputs and outputs

4 CT + 8 BI + 6 BO

4 CT + 13 BI + 8 BO

4 CT + 23 BI + 12 BO

4 CT + 38 BI + 18 BO

4 CT + 4 VT + 9 BI + 8 BO

4 CT + 4 VT + 14 BI + 10 BO

4 CT + 4 VT + 19 BI + 12 BO

4 CT + 4 VT + 39 BI + 20 BO

Communication
Standard front USB port (for configuration using Reydisp PC based software tool) rear RS485, 2 x RJ45 electrical ports or optional optical ethernet connections.

Housing
Size 6 or 12 with drawable design. Display Backlit 128 x 128 LCD with text and graphical display capabilities suitable for single line mimic diagrams.

Reyrolle 7SR51 Numerical Relay Functions

Standard functionality

• 37/ 37G undercurrent protection
• 46 Negative sequence overcurrent protection
• 46BC Broken conductor detection
• 49 Thermal overload protection
• 50/ 50N/ 50G Instantaneous overcurrent
• 50AFD Arc flash detection
• 50BF Circuit-breaker failure protection – 3 pole
• 50GS Instantaneous sensitive earth fault measured
• 50SOTF Switch onto fault
• 51/ 51N/ 51G Time delayed overcurrent
• 51CL Cold load overcurrent phase
• 51GS Time delayed sensitive earth fault measured
• 52 Circuit-breaker control
• 60CTS CT supervision
• 74TC/ 74CC Trip-circuit and close-circuit supervision
• 79 Automatic reclosing
• 81HB2 Inrush current detection
• 86 Lockout
• 87GH Restricted earth fault protection – high impedance
• 87NL Restricted earth fault protection – low-impedance

Additional functionality – 7SR5111 Directional

• 21FL Fault locator
• 21LB Load blinder
• 25 Synchrocheck – synchronising function
• 27 Undervoltage protection – 3 phase
• 32 Power protection
• 47 Sequence overvoltage protection
• 51V Voltage dependent overcurrent phase
• 55 Power factor
• 59/ 59Vx Overvoltage protection
• 59N Neutral voltage displacement
• 60VTS VT supervision
• 67/ 67N/ 67G Directional overcurrent
• 78VS Voltage vector shift
• 81 Frequency protection – “f>” or “f<“
• 81R Frequency protection “df/dt”

Monitoring functions

• Primary, secondary and phase sequence current & voltage
• Frequency, power, energy and fault location
• Fault data, event and waveform records

Communication

• IEC 60870-5-103, MODBUS-RTU, DNP 3.0, IEC 61850

Applications

• Overcurrent and earth fault protection for medium voltage substations.
• Backup protection for other main protection devices e.g. on lines, transformers, generators, motors and busbars.
• Selectable directional overcurrent and earth fault elements for interconnected systems.
• Measured and calculated earth fault protection elements provide a flexible solution when both earth fault and sensitive earth fault are required.
• Detection of earth faults in all networks including isolated and compensated networks.
• High speed overcurrent elements for use with arc fault detectors to provide high speed fault detection and tripping.
• Blocked overcurrent schemes using hardwiring or configurable IEC 61850 elements.
• Configurable automatic reclosing to restore power flow for transient network faults.

Benefits

• Selectable languages on product – English, Portuguese, Turkish, French, Spanish and German
• Compact design and low product life-cycle cost.
• Reliable operation due to powerful, proven protection algorithms.
• IEC 61850 Edition 1 & 2 with HSR, PRP and RSTP operation for increased availability.
• Simple product ordering
• 28 programmable tri-color LEDs for clear indications.

The protection, control, monitoring and measuring of our power networks is a vital element in managing our electrical assets, increasing reliability, sustainability and the safety of operating personnel. Our goal is to provide protection devices which provide flexible solutions and easy integration into an energy market which is becoming increasingly decentralized and digitalized. With the new Reyrolle 5 we have listened to the changing needs of our customers. With IEC 61850 Ethernet communications as standard and enhanced cyber security the Reyrolle 5 enables substation digitalization.The user friendly, intuitive design and minimal ordering variants gives confidence to the user and this extends to the Reydisp programming software tools.