Siemens Reyrolle 5 7SR5421 Transformer Differential Protection Numerical Relay

The Siemens Reyrolle 5 7SR5421 is designed for 2-winding transformer differential protection with directional overcurrent backup. It supports advanced protection, monitoring, and control functions, making it suitable for modern substation applications.

The device provides integrated logic, monitoring, and recording features along with configurable parameter sets and circuit breaker control functionality.

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
•  Voltage-dependent overcurrent (ANSI 51V): Yes
•  Power factor (ANSI 55): No
•  Overvoltage protection (ANSI 59): Yes
•  Zero-sequence overvoltage (ANSI 59N): Yes
•  Directional overcurrent (ANSI 67): Yes
•  Directional earth fault protection (ANSI 67N): Yes
•  Directional sensitive earth fault (ANSI 67Ns): No
•  Trip circuit supervision (ANSI 74TC): Yes
•  Automatic reclosing (ANSI 79): No
•  Frequency protection (ANSI 81): Yes
•  ROCOF (ANSI 81R): Yes
•  Vector shift protection: Yes
•  Lockout (ANSI 86): Yes
•  Transformer differential protection (ANSI 87T): Yes
•  Restricted earth fault protection (ANSI 87N): Yes
•  Fault locator: No
•  Inrush current detection: Yes
•  External trip: Yes

Supply Voltage

• AC: 100 – 230 V
•  DC: 24 – 250 V
•  Type: AC/DC

Inputs / Outputs

• Digital inputs: up to 12
•  Digital outputs: up to 8
•  Voltage inputs: up to 4
•  Current inputs: up to 8

Communication

• Front operating interface: Yes
•  Modbus TCP: Yes
•  IEC 60870-5-103: Yes
•  IEC 61850-8-1: Yes
•  Modbus RTU: Yes
•  DNP3 (serial): Yes
•  DNP3 TCP: Yes
•  PRP: Yes
•  RSTP: Yes
•  HSR: Yes

Time Synchronization

Data communication or digital input

Mechanical Design

• Width: 308 mm
•  Height: 177 mm
•  Depth: 217.5 mm
•  Enclosure size: S12
•  Hardware expandable: No

Environmental Conditions

Operating temperature: -10°C to +55°C