Siemens Reyrolle 7SR54 Transformer Protection Relay
The Siemens Reyrolle 7SR54 Transformer Protection Relay is engineered to provide high-performance differential protection for two and three winding transformers. Designed with 8/12xI current inputs and 0/4xV voltage inputs, it ensures precise fault detection and selective tripping during internal transformer faults, thereby reducing equipment damage and power outages.
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
Key Features & Benefits:
- Comprehensive Protection – Covers differential faults, restricted earth faults, and overcurrent conditions.
- Multi-Winding Capability – Suitable for 2 and 3-winding transformers, offering flexibility in application.
- High Reliability – Siemens technology ensures consistent performance in harsh industrial and utility environments.
- System Integration – Compatible with modern substation automation systems and communication protocols.
Reduced Downtime – Fast fault detection minimizes transformer damage and extends service life.
Application
- 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
Widely used in power plants, transmission & distribution substations, and industrial transformer protection applications across Mumbai and India.
Standard Functionality can include
- 24 Overexcitation protection
- 27 Undervoltage protection – 3 phase
- 27Vx Undervoltage protection – Vx37 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<“
Reviews
There are no reviews yet.