GE 745-W3-P511-G51-HI-R-E-H Transformer Protection System
The 745 Transformer Protection System is a full-featured transformer protection relay suitable for application on small, medium, and large power transformers. The 745 can be applied on two-winding and three-winding transformers. It uses multiple current and voltage inputs to provide primary protection and backup protection of transformers, including differential, ground differential phase, neutral, and ground overcurrent, over-fluxing, and on-load tap changer protection.

- User-Friendly Operation: Easy-to-use transformer protection supported by an industry-leading suite of software tools
- Enhanced Transformer Security: Improved protection during transformer energization
- Accurate Metering: Built-in measurement and monitoring functions
- Advanced Automation: FlexLogic automation capabilities for custom protection schemes
- Reliable Communication: Fast, flexible communications with IRIG-B time synchronization, event reports, waveform capture, and data logging
- Simulation & Verification: Built-in simulation features for setpoint testing
- Environmental Resilience: Optional conformal coating for chemically corrosive and humid environments
- Security & Traceability: Security Audit Trail for detailed configuration change tracking
- Maintenance Efficiency: Minimize downtime with draw-out capability
Protection Capabilities
- Variable Dual-Slope Percent Differential Protection for precise transformer fault detection
- Magnetizing Inrush & Overexcitation Blocking to prevent false tripping
- Phase & Ground Overcurrent Elements for comprehensive current protection
- Adaptive Time Overcurrent Protection using FlexCurves elements
- Underfrequency & Overfrequency Protection for abnormal operating conditions
- Frequency Rate-of-Change Detection for dynamic system monitoring
- Overexcitation (V/Hz) Protection to safeguard transformer core
- Restricted Ground Fault Protection for sensitive fault detection
- Transformer Overload Protection to prevent thermal damage