Siemens Reyrolle 7SR54 Transformer Differential Protection Relay
The Siemens Reyrolle 7SR54 Transformer Differential Protection Relay is a state-of-the-art device designed for two- and three-winding transformer protection, offering advanced communication, cybersecurity, and monitoring capabilities. Built with Siemens’ latest technology, it ensures accurate fault detection, selective tripping, and enhanced transformer safety — ideal for power utilities, substations, and industrial applications.The relay provides differential, restricted earth fault, and overcurrent protection, ensuring fast response to internal transformer faults, reducing equipment damage, and minimizing downtime. With its withdrawable design, large LCD display, and intuitive interface, it offers superior ease of operation and maintenance
Technical Specifications
Inputs/Outputs: 8–12 CT, up to 4 VT, up to 35 BI, and 16 BO
Communication: IEC 61850, IEC 60870-5-103, MODBUS RTU, DNP 3.0
Display: 128 × 128 LCD with graphical interface
Functions: Differential (87T), REF (87GH), Overcurrent (50/51), Earth Fault (50N/51N), Overvoltage (59), Undervoltage (27), Inrush (81HB2), Overfluxing (81HB5), Lockout (86)
Housing: Size 12, withdrawable design
Applications: Transformer, autotransformer, and reactor protection
Communication: IEC 61850, IEC 60870-5-103, MODBUS RTU, DNP 3.0
Display: 128 × 128 LCD with graphical interface
Functions: Differential (87T), REF (87GH), Overcurrent (50/51), Earth Fault (50N/51N), Overvoltage (59), Undervoltage (27), Inrush (81HB2), Overfluxing (81HB5), Lockout (86)
Housing: Size 12, withdrawable design
Applications: Transformer, autotransformer, and reactor protection
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