GE Multilin 745-W3-P5-G5-HI-E Transformer Management Protection Relay

Product Description

GE Multilin (GE Vernova) 745-W3-P5-G5-HI-E is the SR745 transformer management differential relay designed for three-winding transformers. The SR family is discontinued and mainly used as spare parts for existing power plants and substationsGE Vernova. Code definition: W3 = three-winding support, P5 = 5A phase CT, G5 = 5A ground CT, HI = universal wide-range AC/DC supply, E = enhanced LCD front panel. It features dual-slope percentage differential, 2nd/5th harmonic inrush restraint, restricted ground fault (RGF), V/Hz overexcitation, negative-sequence overcurrent, thermal overload and breaker failure protection. It includes FlexLogic programmable logic, oscillography, SOE sequence of events, harmonic monitoring and tap position detection. Configuration is performed by EnerVista software. It is widely deployed for transformer protection in power plants and petrochemical captive power stationsGE Vernova.

Specifications

• Model: 745-W3-P5-G5-HI-E
• Brand: GE Multilin / GE Vernova
• Type: Three-Winding Transformer Differential & Management Relay
• CT Rating: 5A phase (P5), 5A ground zero-sequence (G5)
• Power Supply: 70–265VAC / 88–300VDC (HI)
• Front Panel: E, enhanced LCD panel
• Protection Elements: Dual-slope percentage differential (87T), unrestrained instantaneous differential, harmonic restraint, RGF restricted ground fault, V/Hz overexcitation, phase overcurrent, zero-sequence protection, negative-sequence overcurrent, thermal model, breaker failure, frequency protectionGE Vernova
• Monitoring: Current, voltage, power, energy, THD up to 21st harmonic, tap changer position, RTD temperature, COMTRADE oscillography, SOE logGE Vernova
• Configuration Tool: EnerVista 745 Setup
• Communication: RS485 Modbus; Ethernet and IRIG-B optional
• Mounting: Panel flush mount
• Operating Temperature: -20℃ ~ +60℃
• Storage Temperature: -40℃ ~ +85℃
• Enclosure Rating: Front IP52, internal IP20
• Certifications: UL, cUL, CE, IEEE compliant

Application

1. Main, startup and station service three-winding transformers for thermal and hydro plants
2. Differential and backup protection for 10kV ~ 220kV three-winding transformers in substations
3. Transformer protection and monitoring for captive power plants in petrochemical and coal chemical facilities
4. Main transformer protection for steel and non-ferrous industrial substations
5. Step-up transformer protection and fault recording for solar and wind collector stations
6. Spare replacement for legacy SR745 relays during power system retrofits

Series Models

745-W2-P5-G5-HI-E (two-winding), 745-W3-P5-G5-HI-E, 745-W3-P1-G1-HI-E (1A CT version)