GE 745-W2-P5-G5-H1-A-R-E Transformer Integrated Protection Management Relay

I. Basic Material Information
Brand: GE Vernova (formerly GE Multilin)
Model: 745-W2-P5-G5-H1-A-R-E
Product type: Two-winding / Three-winding power transformer main protection + backup comprehensive measurement and control device
Installation method: 19-inch plug-in standard panel installation, front panel IP40, back panel IP20
Official manual: GEK-106635 (745 official English user manual), accompanying debugging software: EnerVista 745 Setup
Product status: Classic in-use relay protection model, original factory still supplies spare parts, widely used in thermal power, chemical, metallurgy, and substation systems of GE Vernova

Complete Segmentation Analysis of the Model
W2: Wide-range universal power supply, 110~240VAC / 110~250VDC dual compatibility
P5: Three-phase CT secondary rated current 5A (current input of all windings is 5A specification)
G5: Neutral point grounding current CT input rated 5A, supports limiting grounding fault protection (RGF)
H1: Enhanced high-definition LCD display panel, local button setting, fault viewing
A: Advanced function configuration: 4 independent setting zones, programmable FlexLogic logic, on-load voltage regulation (OLTC) monitoring, transformer thermal aging life calculation
R: Three-proof moisture-proof and corrosion-resistant coating version, suitable for humid, dusty, and corrosive harsh industrial sites
E: Rear-mounted dual RS485 communication interfaces, support Modbus RTU, DNP3 protocol connection to SCADA/DCS systems

Core Protection Functions (ANSI Standard)
1. Main Protection (Transformer Internal Fault)
87T Ratio Braking Differential Protection (adaptive 2/3/5 harmonic blocking, avoiding excitation surge current)
87RGF Grounding Fault Protection (neutral winding grounding short circuit main protection)
59V/Hz Overexcitation Protection, preventing transformer core from overheating and burning
2. Phase-to-Phase Backup Protection
51P Inverse Time Limit / Time Limit Phase-to-Phase Overcurrent Protection
46 Negative Sequence Overcurrent Protection (three-phase imbalance, phase loss, inter-turn fault)
50P Phase-to-Phase Instantaneous Overcurrent Instantaneous Protection
3. Ground Fault Protection
51N Neutral Point Time-Limited Ground Overcurrent
50N Zero Sequence Instantaneous Ground Instantaneous Protection
Sensitive detection of winding grounding faults
4. Abnormal Operating Condition Protection
Overload Thermal Accumulation Protection, Transformer Winding Temperature Monitoring
Frequency Abnormal Protection, Low Voltage Lockout, Circuit Breaker Failure Protection
On-load Voltage Regulation Position Abnormal Monitoring, Voltage Regulation Lockout Protection

Hardware I/O and Communication Configuration
Analog input
Three winding three-phase current, three-phase voltage, neutral point zero-sequence current; support on-load voltage regulation resistance signal acquisition, multiple 4-20mA temperature transducer input
Switching quantity: 16 passive remote signal DI, 12 C-type relay DO (trip, alarm, signal)
Communication interface
Front panel RS232 local debugging port; back panel dual isolation RS485, Modbus RTU, DNP3; support SOE millisecond-level event sequence recording, fault recording (64 points sampling per cycle) GE Vernova
Storage capacity: 256 event records with time-stamp, up to 10 times fault recording waveform storage

Core Advanced Functions
Four setting zone switching: can switch protection settings for normal operation, maintenance, standby, and fault conditions
Transformer Life Loss Monitoring: real-time calculation of winding thermal aging degree, predicting insulation aging Harmonic Monitoring: Up to 21 harmonic analysis, total harmonic distortion (THD) monitoring, for diagnosing the harmonic hazards of rectifier loads.
Programmable Logic: Custom interlock, trip lock, remote protection activation/deactivation, fault first occurrence memory.
Analog Input Output: Current, voltage, power, 4-20mA remote transmission to DCS

 Typical Application Scenarios
Complete electrical protection for power plant main transformers, plant auxiliary high-voltage transformers, emergency standby transformers
Power transformers for chemical plants, metallurgy, coal mines, substations 10kV – 220kV
Emergency power stations, waste heat power plants, two-winding / three-winding oil-immersed transformers for relay protection