The Siemens Reyrolle 5 7SR54 is a numerical protection relay designed for differential protection of 2-winding and 3-winding transformers in medium- and high-voltage power systems. It provides fast, selective, and reliable protection against internal faults, ensuring the safety and stability of critical transformer assets.
The relay uses advanced differential protection algorithms to maintain high sensitivity while ensuring stability during conditions such as magnetizing inrush currents and overexcitation. This prevents unnecessary tripping and improves overall system reliability.
In addition to differential protection, the 7SR54 offers a range of backup and auxiliary protection functions, making it suitable for comprehensive transformer protection schemes. Its integration of control, monitoring, and communication capabilities enables seamless operation within modern substation automation systems.
Main Function
- Differential protection for 2-winding and 3-winding transformers
- Suitable for power and distribution transformers
- Backup protection for connected feeders and networks
- Applicable for MV and HV transformer protection
Tripping
- Fast and selective 3-pole tripping for internal faults
- High-speed operation for transformer fault clearance
- Stable operation during inrush and overexcitation conditions
Inputs and Outputs
- Current transformer (CT) inputs: multiple sets for transformer windings
- Voltage transformer (VT) inputs: optional
- Binary inputs: configurable for control and status signals
- Binary outputs: configurable for tripping, alarm, and control
Hardware Flexibility
- Modular and flexible hardware configuration
- Adaptable for 2-winding and 3-winding transformer applications
- Configurable protection functions based on application needs
- Engineering and configuration using Reyrolle 5 software tools
Housing
- Compact and robust housing
- Suitable for panel mounting
- Designed for reliable performance in industrial and utility environments
Function (Key Features)
- Transformer differential protection with stabilization
- Inrush current restraint and overexcitation blocking
- Restricted earth fault (REF) protection
- Overcurrent backup protection
- Thermal overload protection
- Overfluxing (V/Hz) protection
- Breaker failure protection
- Fault recording and disturbance analysis
- Event logging and monitoring
- Communication support:
- IEC 61850 (optional)
- IEC 60870-5-103
- Modbus / DNP3
- Integration with SCADA and substation automation systems
Highlights
- Supports both 2-winding and 3-winding transformer protection
- High stability during inrush and transient conditions
- Integrated backup protection functions
- Flexible configuration for various transformer applications
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