The General Electric 745-W2-P5-G5, also cataloged as the 745 Transformer Protection Relay, operates as a dedicated hardware component for high-speed differential protection, monitoring, and control within substation transformer power networks. It provides current-based harmonic restraint, dual-slope percentage differential execution, overcurrent detection, and asset health evaluation for two-winding transformer configurations.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 745-W2-P5-G5 |
| Brand | General Electric |
| Origin | USA |
| Weight | 7.54 kg |
| Dimensions | 21.5 cm x 23 cm x 25 cm |
| Operating Temp | -20 to 60 deg C |
| Power Consumption | 30 W maximum |
| Windings Supported | 2-winding configurations (W2) |
| Current Transformer Inputs | 5 A Phase CT secondary inputs (P5) |
| Ground CT Inputs | 5 A Ground CT secondary input (G5) |
| Case Construction | Draw-out case for panel mounting |
| Communication Protocols | Modbus RTU, DNP 3.0 Level 2, RS232, RS485 |
Substation Communication and Firmware Compatibility
The General Electric 745-W2-P5-G5 utilizes dedicated internal processing pipelines to maintain deterministic network execution and high backplane bus communication velocity. The architecture supports EtherNet/IP and Modbus network integration for high-density I/O data streaming, transmitting real-time sequence components, total harmonic distortion (THD) metrics, and oscillography event records to SCADA hosts. Internal firmware flash compatibility facilitates setpoint file execution and FlexLogic equations without disrupting physical current transformer sampling loops.
Frequently Asked Questions
Q: What is the purpose of the draw-out case construction on the 745-W2-P5-G5 relay?
A: The draw-out case design allows the internal relay chassis to be removed for testing or replacement without disturbing external terminal block wiring or shorting secondary current transformer circuits.
Q: How are current inputs configured on the P5 and G5 model variants?
A: The P5 designation indicates 5 A rated secondary phase current transformer inputs, while the G5 designation specifies a 5 A rated secondary ground current transformer input channel.
Q: Does the unit support harmonic restraint during transformer energization?
A: Yes, the relay executes 2nd and 5th harmonic restraint algorithms to inhibit percentage differential trip outputs during transformer magnetizing inrush and overexcitation conditions.
Field Installation Guidelines
- Mount the draw-out sleeve securely into the panel cutout using standard mounting hardware before inserting the relay unit.
- Ensure the safety ground terminal on the rear panel connects directly to the substation earth ground bus using a short, low-impedance copper wire (minimum 12 AWG).
- Verify that all secondary current transformer wiring matches the 5 A AC current rating of the P5 and G5 terminal terminals prior to energization.
- Route low-voltage RS485 and Ethernet communication cables in separate grounded conduits away from high-voltage AC current inputs and trip output contact wiring.
- Confirm that the DC power supply voltage rating matches the auxiliary power terminal specifications before applying operating voltage.
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| Shipping Port | ShangHai, Xiamen |
| Warranty | 12 Months |
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| A: All our new and original products come with a standard one-year warranty. |
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