Reyrolle 7SR51: Overcurrent Protection

OVERCURRENT PROTECTION
Reyrolle 7SR51
siemens.com/reyrolle
Description • IEC 61850 Edition 1 & 2 with HSR, PRP and RSTP operation
The Reyrolle 5 is designed for the electricity networks of the for increased availability
future with enhanced communications and cyber security • Simple product ordering
whilemaintaining a user‑friendly interface and easy product • Combined 1 A and 5 A current transformer inputs
management. • 28 programmable tri‑color LEDs for clear indications
• User selectable languages: English, French, German,
The Reyrolle 7SR51 overcurrent device includes a wide range
Portugese, Spanish, Turkish
of protection functions and IEC 61850 Ethernet
• Conformal coating ordering option
communications as standard. To further minimize the
product variants the power supply and the binary inputs Applications
cover the full operating range with configurable binary input • Overcurrent and earth fault protection for medium
thresholds. voltage substations
• Backup protection for other main protection devices e.g.
The large LCD, tactile pushbuttons and programmable LEDs
on lines, transformers, generators, motors, and busbars
provide a user‑friendly product interface and the relay
• 5 CT model to provide measured standby earth fault for
element is withdrawable for easy replacement.
protection of transformer earthing resistors in addition to
Benefits high-impedance earth fault protection
• Compact design and low product life‑cycle cost • Selectable directional overcurrent and earth fault
• Reliable operation due to powerful, proven protection elements for interconnected systems
algorithms
• Measured and calculated earth fault protection elements • 47 Sequence overvoltage protection
provide a flexible solution when both earth fault and • 51V Voltage dependent overcurrent – phase
sensitive earth fault current detection is required • 55 Power factor
• Detection of earth faults in all networks including isolated • 59/59Vx Overvoltage protection
and compensated networks • 59N Neutral voltage displacement
• High speed overcurrent elements for use with arc fault • 60VTS VT supervision
detectors to provide high speed fault detection and • 67/67G/67GI/67GS/67N Directional – phase/earth fault
tripping • 78VS Voltage vector shift
• Blocked overcurrent schemes using hardwiring or • 81 Frequency protection – "f>" or "f<"
configurable IEC 61850 elements • 81R Frequency protection – "df/dt"
• Configurable automatic reclosing to restore power flow
Monitoring Functions
after transient network fault.
• Primary, secondary, and phase sequence, current
Functions & voltage
Standard Functionality • Frequency, power, energy and fault location
• 37/37G Undercurrent protection – phase/earth • Fault data, event and waveform records
• 46 Negative sequence overcurrent protection
Communication
• 46BC Broken conductor detection
• IEC 60870‑5‑103, Modbus TCP
• 49 Thermal overload protection
Modbus RTU, DNP3, IEC 61850
• 49TS Temperature sensor supervision¹
• 50/50G/50N Instantaneous overcurrent/earth fault
Inputs and Outputs
• 50AFD Arc flash detection² 4 I + 8 BI + 6 BO
• 50BF Circuit-breaker failure protection – 3-pole 4 I + 13 BI + 8 BO
4 I + 3 AFD + 13 BI + 11 BO (inc. 3 HSBO)
• 50GHS High speed earth fault – measured
4 I + 23 BI + 12 BO
• 50GI Intermittent earth fault 4 I + 38 BI + 18 BO
• 50GS Instantaneous sensitive earth fault – measured 4 I + 4 V + 9 BI + 8 BO
4 I + 4 V + 3 AFD + 9 BI + 11 BO (inc. 3 HSBO)
• 50HS High speed overcurrent – phase
4 I + 4 V + 14 BI + 10 BO
• 50SOTF Switch onto fault 4 I + 4 V + 19 BI + 12 BO
• 51/51G/51N Time delayed overcurrent/earth fault 4 I + 4 V + 3 AFD + 19 BI + 15 BO (inc. 3 HSBO)
4 I + 4 V + 24 BI + 14 BO
• 51CL Cold load overcurrent – phase
• 51GS Time delayed sensitive earth fault – measured 4 I + 4 V + 39 BI + 20 BO
• 52 Circuit-breaker control 4 I + 4 V + 3 AFD + 39 BI + 23 BO (inc. 3 HSBO)
5 I + 4 V + 17 BI + 10 BO
• 60CTS CT supervision
5 I + 4 V + 22 BI + 12 BO
• 74CC/74TC Close‑circuit and trip‑circuit supervision 5 I + 4 V + 3 AFD + 22 BI + 15 BO (inc. 3 HSBO)
• 79 Automatic reclosing 5 I + 4 V + 37 BI + 18 BO
• 81HB2 Inrush current detection
• 86 Lockout Communication
Standard front USB port (for configuration using
• 87GH Restricted earth fault protection – high-impedance
Reydisp PC based software tool) rear RS485, 2 x RJ45electrical ports or
• 87NL Restricted earth fault protection – low-impedance optional optical Ethernet connections
Additional Functionality – Devices with VT Inputs Housing
• 21FL Fault locator Size 6 or 12 with withdrawable design
• 21LB Load blinder Display

• 25 Synchrocheck – synchronizing function Backlit 128 x 128 LCD with text and graphical display capabilities suitable
for single line mimic diagrams
• 27/27Vx Undervoltage protection
• 32 Power protection
Siemens AG
Smart Infrastructure
Digital Grid
Humboldstraße 59
90459 Nuremberg, Germany
Customer Support: www.siemens.com/scs
© Siemens 2021, Subject to changes and errors.
7SR51_Profile_07.21
1 An external interface unit is required.

2 Requires external components

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OVERCURRENT PROTECTION

Additional Functionality – Devices with VT Inputs Housing

• 21FL Fault locator Size 6 or 12 with withdrawable design

• 21LB Load blinder Display

1 An external interface unit is required.

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