Siemens Reyrolle 5 7SR5431 Transformer Differential Protection Relay

The Siemens Reyrolle 5 7SR5431 is designed for 3-winding transformer differential protection with directional overcurrent backup. It is part of the Reyrolle 7SR54 family and supports advanced protection, monitoring, and control functions for modern substation applications.

The device includes multiple current and voltage transformer inputs along with configurable binary inputs and outputs, ensuring flexibility for transformer protection schemes.

Siemens Reyrolle 5 7SR5431 Inputs and Outputs

12 CT + 4 VT + 25 BI + 12 BO (standard configuration)

Additional variants available:
12 CT + 4 VT + 35 BI + 16 BO

Communication

1 × USB (front), RS-485 (rear), and Ethernet interfaces (RJ45 or optical, depending on variant).

Housing

S12 enclosure with withdrawable design.

Product Details

• Number of function keys: 7
• Number of LEDs: 28

Product Functions

• Type of measured value detection (standard): Yes
•  Expanded measured values (min./max./mean): Yes
•  Switching statistics: Yes
•  Circuit breaker monitoring: Yes
•  Logic editor: Yes
•  Control: Yes
•  Fault recording (analog and digital): Yes
•  Sequence-of-events recorder: Yes
•  Monitoring: Yes
•  Number of parameter sets: 4
• Parameter set switchover: Yes
•  Circuit breaker test: Yes

Protection Functions

• Three-pole tripping: Yes
•  Synchrocheck (ANSI 25): Yes
•  Undervoltage protection (ANSI 27): Yes
•  Directional power monitoring (ANSI 32): Yes
•  Forward power supervision (ANSI 32F): Yes
•  Reverse power protection (ANSI 32R): Yes
•  Undercurrent protection (ANSI 37): Yes
•  Unbalance protection (ANSI 46): Yes
•  Negative sequence overcurrent (ANSI 46): Yes
•  Phase rotation supervision (ANSI 47): Yes
•  Negative sequence overvoltage (ANSI 47): Yes
•  Thermal overload protection (ANSI 49): Yes
•  Instantaneous overcurrent (ANSI 50/50N): Yes
•  Switch on to fault (ANSI SOTF): No
•  Arc protection (ANSI AFD): Yes
•  Sensitive earth fault (ANSI 50Ns): No
•  Circuit breaker failure protection (ANSI 50BF): Yes
•  Time delayed overcurrent (ANSI 51/51N): Yes
•  Dynamic response changeover (ANSI 51C): Yes

Monitoring Functions

Measured values, fault recording, and event logging are supported.

Applications

Protection of 3-winding transformers with directional overcurrent backup in medium- and high-voltage substations.

Benefits

• Integrated monitoring and control functions
• Flexible configuration with multiple parameter sets
• Combined differential and directional overcurrent protection
• Reliable operation for transformer protection schemes