Transformer differential protection

Transformer differential protection – Reyrolle 7SR54

Reyrolle 7SR54

The Reyrolle 7SR54 provides protection, control and monitoring for 2 and 3 winding transformers. All transformer vector groups and earthing connections are considered.

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Features & functions

Transformer differential protection Reyrolle 7SR54

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 7SR54 provides protection, control and monitoring for 2 and 3 winding transformers. All transformer vector groups and earthing connections are considered.

 

The Reyrolle 7SR54 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.

 

Inputs and Outputs

8 CT + 16 BI + 8 BO

8 CT + 4 VT + 12 BI + 8 BO

8 CT + 4 VT + 37 BI + 18 BO

12 CT + 24 BI + 10 BO

12 CT + 4 VT + 35 BI + 16 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

12 with drawable design.

 

Display

Backlit 128 x 128 LCD with text and graphical display capabilities suitable for single line mimic diagrams.

Functions

Standard Functionality can include

  • 24 Overexcitation protection
  • 27 Undervoltage protection – 3 phase
  • 27Vx Undervoltage protection – Vx
  • 37 Undercurrent protection – phase
  • 37G Undercurrent earth fault – measured
  • 46 Negative sequence overcurrent protection
  • 46BC Broken conductor detection
  • 47 Sequence overvoltage protection
  • 49 Thermal overload protection
  • 50 Instantaneous overcurrent – phase
  • 50BF Circuit-breaker failure protection – 3 pole
  • 50G Instantaneous earth fault – measured
  • 50N Instantaneous earth fault – calculated
  • 51 Time delayed overcurrent – phase
  • 51G Time delayed earth fault – measured
  • 51N Time delayed earth fault – calculated
  • 52 Circuit-breaker control
  • 59 Overvoltage protection – 3 phase
  • 59NVD Neutral voltage displacement
  • 59Vx Overvoltage protection – Vx
  • 60CTS-I CT supervision – current reference
  • 60VTS VT supervision
  • 74CC Close-circuit supervision
  • 74TC Trip-circuit supervision
  • 81 Frequency protection – “f>” or “f<”
  • 81HB2 Inrush current detection
  • 81HB5 Overfluxing detection – 5th harmonic
  • 86 Lockout
  • 87GH Restricted earth fault protection – high impedance
  • 87T-BD Transformer differential protection – biased
  • 87T-HS Transformer differential protection – highest

Additional Functionality – Requires VT Inputs

  • 21LB Load blinder (7SR5421)
  • 24 Overexcitation protection
  • 27/27Vx Undervoltage protection
  • 47 Sequence overvoltage protection
  • 51V Voltage dependent overcurrent – phase (7SR5421)
  • 59/59Vx Overvoltage protection
  • 59N Neutral voltage displacement
  • 60VTS VT supervision
  • 67/67G/67N Directional – phase/earth fault (7SR5421)
  • 81 Frequency protection – "f>" or "f<"

 

Monitoring Functions

  • Current:
    - Primary phases and earth
    - Secondary phases and earth
    - Phase sequence (PPS, NPS, ZPS)
  • Voltage
    - Primary
    - Secondary
    - Phase sequence (PPS, NPS, ZPS)
  • Frequency, power and energy
  • Binary input/output and virtual I/O status
  • Fault data, event and waveform records

Communication

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

Applications

  • 2 or 3 winding comprehensive protection for transformers.
  • Differential protection for auto-transformers, reactors and motors.
  • Measured and calculated earth fault protection elements provide a flexible solution when both earth fault and restricted earth fault are required

Benefits

  • 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
  • Combined 1 A and 5 A current transformer inputs.
  • 28 programmable tri-color LEDs for clear indications.

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