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Description
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | GE Multilin 745-W3-P5-G5-HI-A-L-R-E-H |
| Manufacturer | General Electric (GE Multilin) |
| Product Type | Transformer Management Relay / Protection System |
| Series | Multilin 745 |
| Transformer Support | Two-winding and three-winding configurations |
| Phase CT Input Rating | 5A nominal (P5 suffix) |
| Ground CT Input Rating | 5A nominal (G5 suffix) |
| Control Power (HI Option) | DC: 90-300V; AC: 70-265V, 48-62Hz |
| Control Power (LO Option) | DC: 20-60V; AC: 20-48V, 48-62Hz |
| Display | 40-character LCD with backlight |
| Communication Ports | Front RS232, Rear RS485/RS422 |
| Communication Protocols | Modbus RTU, DNP 3.0 Level 2 |
| Ethernet Option | 10BaseT, Modbus TCP/IP |
| Digital Inputs | 16 logic inputs |
| Digital Outputs | Configurable output relays |
| Analog Input | General purpose transducer input |
| Analog Output | Optional DC mA type |
| Operating Temperature | -40°C to +60°C |
| Storage Temperature | -40°C to +90°C |
| Humidity Tolerance | 0-90% non-condensing |
| Drawout Case | Yes, for maintenance isolation |
| Dimensions | 208 × 220 × 246 mm |
| Weight | 4.8 – 7.6 kg (depending on configuration) |
Main Features and Advantages
Advanced differential protection with harmonic blocking: The GE Multilin 745-W3-P5-G5-HI-A-L-R-E-H features variable dual-slope percentage differential protection that provides reliable fault discrimination across a wide range of operating conditions. The relay incorporates sophisticated second and fifth harmonic blocking logic that distinguishes transformer magnetizing inrush current and overexcitation conditions from actual internal faults, effectively eliminating nuisance tripping during transformer energization. This advanced algorithm, combined with the 745-W3-P5-G5-HI-A-L-R-E-H‘s 64 samples-per-cycle sampling rate, ensures reliable protection while maintaining security against false operations.
Comprehensive asset monitoring and life extension: One of the most valuable capabilities of the GE Multilin 745-W3-P5-G5-HI-A-L-R-E-H is its transformer asset monitoring functionality. The relay calculates and logs critical parameters including hottest-spot temperature, aging factor, and loss-of-life data over extended periods. This information enables maintenance engineers to develop data-driven decisions regarding transformer replacement timing, optimizing capital expenditure while managing operational risk. The 745-W3-P5-G5-HI-A-L-R-E-H also monitors tap changer position, ambient temperature, and includes a general purpose analog transducer input for user-defined quantities, all of which can be integrated into the protection scheme via FlexLogic™.
Flexible communication and system integration: The GE Multilin 745-W3-P5-G5-HI-A-L-R-E-H offers extensive communication capabilities that enable seamless integration into modern substation automation systems. The embedded Ethernet port (specified by the “E” suffix) supports Modbus TCP/IP communication, while the rear RS485 port provides Modbus RTU and DNP 3.0 Level 2 protocols. Front-panel RS232 access simplifies local configuration using the EnerVista 745 software suite, which provides simulation, diagnostics, and real-time monitoring capabilities. The 745-W3-P5-G5-HI-A-L-R-E-H also supports IRIG-B time synchronization for accurate event correlation across multiple protection devices.
Enhanced environmental protection and mechanical design: The “H” suffix on the GE Multilin 745-W3-P5-G5-HI-A-L-R-E-H indicates optional conformal coating that protects the printed circuit boards from chemically corrosive environments, high humidity, and salt spray conditions common in coastal or industrial installations. The rugged drawout case design of the 745-W3-P5-G5-HI-A-L-R-E-H allows for complete module removal without de-energizing the transformer or disturbing field wiring, significantly reducing maintenance time and exposure to energized equipment.
Advanced event recording and fault analysis: The GE Multilin 745-W3-P5-G5-HI-A-L-R-E-H captures and stores up to 128 time-stamped events, providing a comprehensive record of system operations and disturbances. The relay also maintains up to 10 waveform capture records spanning 32 power cycles, enabling detailed post-fault analysis to identify root causes and verify protection system performance. The 745-W3-P5-G5-HI-A-L-R-E-H includes harmonics analysis up to the 21st order and calculates Total Harmonic Distortion (THD) per IEEE 519 standards.
