Application Scenarios
In a steel manufacturing facility where three-winding transformers step down 110kV incoming power to 35kV and 10kV distribution levels, protection coordination had historically been a persistent challenge. The existing electromechanical relays lacked the sensitivity to detect low-magnitude winding-to-ground faults, and maintenance crews struggled with periodic desensitization caused by harmonic inrush currents during transformer energization. After installing the GE 745-W3-P511-G51-HI-R-E as the main protection relay, plant electrical engineers immediately gained access to waveform capture and event recording capabilities that transformed fault diagnosis from guesswork into data-driven analysis. Within six months, the relay correctly identified and isolated a developing inter-turn fault on the 35kV winding that traditional differential protection would have missed. This early detection prevented an estimated $250,000 in transformer replacement costs and avoided two weeks of production downtime.
Parameter
| Parameter | Value/Description |
|---|---|
| Product Model | 745-W3-P511-G51-HI-R-E |
| Manufacturer | GE Multilin (GE Vernova) |
| Product Category | Digital Transformer Protection Relay |
| Series | Multilin 745 Transformer Protection System |
| Transformer Type | Three-winding (W3) |
| Phase CT Inputs (P511) | W1=5A, W2=1A, W3=1A (mixed configuration) |
| Ground CT Inputs (G51) | W1/W2=5A, W2/W3=1A (mixed configuration) |
| Control Power (HI) | 90–300 VDC; 70–265 VAC @ 48–62 Hz |
| Protection Functions | Differential, restricted ground fault, overcurrent, overexcitation |
| Communication | RS232 front / RS485, RS422 rear, 10BaseT Ethernet |
| Protocols | Modbus RTU, Modbus TCP/IP, DNP 3.0 Level 2 |
| Logic Inputs | 16 (dry/wet contact) |
| Output Relays | 9 (1 solid-state + 4 Form-A trip + 4 Form-C auxiliary) |
| Operating Temperature | -40°C to +60°C |
| Mounting | Panel mount / 19-inch rack, drawout case |
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