Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 745-W2-P5-G5-HI-R-E-H |
| Manufacturer | GE Multilin (GE Vernova / GE Grid Solutions) |
| Product Type | Transformer Management Relay / Digital Protection IED |
| Series | GE Multilin 745 Transformer Protection System |
| Winding Configuration | 2-winding (W2) |
| Phase CT Rating | 5 A secondary (P5) |
| Ground CT Rating | 5 A secondary (G5) |
| Control Power | 90–300 VDC / 70–265 VAC, 48–62 Hz (HI) |
| Restricted Ground Fault | Included (R) |
| Display | Enhanced 40-character LCD with expanded keypad (E) |
| Environmental Protection | Conformal coating on PCB (H) |
| Communication Protocols | Modbus RTU, DNP 3.0 Level 2 |
| Communication Ports | Front RS232; Rear RS485/RS422 |
| Logic Inputs | 16 |
| Mounting | Standard 19-inch panel, draw-out case |
| Operating Temperature | -20°C to +60°C |
| Dimensions | 9″ H × 7″ W × 7⅛” D (approximate) |
| Weight | Approximately 4.8 kg |
Main Features and Advantages
Comprehensive protection in a single chassis: The 745-W2-P5-G5-HI-R-E-H integrates percentage differential protection with harmonic restraint, restricted ground fault detection, phase/neutral/ground overcurrent elements, overexcitation (V/Hz) protection, frequency rate-of-change detection, and thermal overload protection. This consolidation reduces panel space, wiring complexity, and the coordination burden associated with multiple discrete relays.
Adaptive CT ratio mismatch correction: The 745-W2-P5-G5-HI-R-E-H performs digital CT ratio matching and phase vector group compensation internally through software configuration, eliminating the need for external interposing CTs. In real installations where CT ratios on the high and low sides of a transformer rarely match perfectly, this capability allows the differential element to operate with higher sensitivity without producing false differential current.
Draw-out construction with CT shorting: The 745-W2-P5-G5-HI-R-E-H is housed in a draw-out case that automatically shorts the CT circuits upon withdrawal. This design enables field replacement of the relay module without rewiring the panel, a decisive advantage for legacy sustainment where rapid restoration of protection is critical.
Environmental hardening: The “H” suffix on the 745-W2-P5-G5-HI-R-E-H denotes conformal coating applied to the PCB assembly. This protective layer guards against dust, humidity, temperature extremes, and chemical exposure—conditions commonly encountered in outdoor substations, industrial plants, and coastal installations.
Metering and asset monitoring: Beyond protection, the 745-W2-P5-G5-HI-R-E-H functions as a metering and asset-management platform. It samples at 64 times the power cycle for harmonic recovery to the 21st order, calculates total harmonic distortion and harmonic derating factor, and tracks hottest-spot temperature, aging factor, and loss of transformer life. The relay stores the last 128 time-stamped events with oscillographic fault records for post-event analysis
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