Power Transformer Protection Solution — GE Multilin 745-W2-P15-G5-HI-A-L-R-E-H | 745 Series
The GE Multilin 745-W2-P15-G5-HI-A-L-R-E-H is a comprehensive transformer management relay engineered for the protection, control, and monitoring of power transformers in utility, industrial, and commercial power systems. Part of the renowned GE Multilin 745 Series, this relay integrates differential protection, overcurrent protection, and advanced metering into a single intelligent electronic device (IED) — making it the preferred choice for engineers designing reliable transformer protection schemes worldwide. Konmask.com supplies this relay through verified industrial channels with full traceability documentation.
Where This Product Is Used
The GE Multilin 745 is deployed across a wide range of power system environments where transformer integrity is mission-critical:
- Utility Substations (Transmission & Distribution): Primary and backup protection for power transformers at 33 kV, 66 kV, 110 kV, and 220 kV substations. Provides high-speed differential tripping to isolate internal faults before they escalate to catastrophic failures.
- Industrial Power Plants & Refineries: Protects main step-down transformers feeding large motor loads in oil & gas, petrochemical, and mining facilities. Integrates with DCS/SCADA systems via Modbus or DNP3 for centralized monitoring.
- Data Centers & Critical Infrastructure: Ensures continuous power availability by providing fast, selective fault isolation on medium-voltage transformers supplying UPS and critical load buses.
- Renewable Energy (Wind & Solar Farms): Applied on collector system transformers and grid interconnection transformers, where reliable protection is essential for grid code compliance and asset longevity.
- Steel Mills & Heavy Industry: Protects furnace transformers and large drive transformers subject to high inrush currents and harmonic-rich load profiles — the 745’s inrush restraint algorithms handle these conditions with precision.
- Marine & Offshore Platforms: Used on platform power transformers where space is limited and multi-function protection in a single relay reduces panel footprint and wiring complexity.
Technical Specifications
- Part Number / SKU: 745-W2-P15-G5-HI-A-L-R-E-H
- Manufacturer: GE Multilin (General Electric Grid Solutions)
- Series: 745 Transformer Management Relay
- Protection Functions: Differential (87T), Overcurrent (50/51), Earth Fault (50N/51N), Restricted Earth Fault (64), Overfluxing (24), Thermal Overload (49), Buchholz / Sudden Pressure (63)
- CT Inputs: Dual winding (W2 configuration) — supports 2-winding transformer protection
- Rated Current: 1A / 5A selectable CT secondary
- Rated Voltage: 100–240 VAC / 110–250 VDC auxiliary supply
- Communication Ports: RS-485 (Modbus RTU), optional Ethernet (DNP3, IEC 61850 GOOSE)
- Display: Backlit LCD with front-panel keypad
- Output Relays: Multiple trip and alarm output contacts (Form A/C)
- Operating Temperature: -20°C to +60°C
- Mounting: 19″ rack / flush panel mount (4U)
- Weight: Approx. 7.54 kg
- Condition: New / Refurbished (specify at inquiry)
Why Engineers Specify This Model
- ✅ Proven Differential Algorithm: The 745’s percentage differential element with harmonic restraint (2nd and 5th harmonic blocking) reliably distinguishes magnetizing inrush from genuine internal faults — minimizing nuisance trips during energization.
- ✅ Comprehensive Protection in One IED: Replaces multiple discrete relays (differential, overcurrent, thermal, earth fault) with a single integrated device — reducing panel space, wiring, and maintenance overhead.
- ✅ Advanced Metering & Event Recording: Built-in power metering (kW, kVAR, kWh) and oscillographic fault recording enable post-fault analysis and energy management without additional instrumentation.
- ✅ Flexible Communication: Native Modbus RTU and optional IEC 61850 support allows seamless integration into both legacy SCADA systems and modern digital substations.
- ✅ Field-Proven Reliability: The GE Multilin 745 has been installed in thousands of substations globally since its introduction — a track record that gives asset owners and insurers confidence in long-term reliability.
- ✅ Configurable via EnerVista Software: GE’s EnerVista 745 Setup software provides intuitive relay configuration, settings upload/download, and real-time monitoring — reducing commissioning time significantly.
Complete System Bill of Materials
A complete transformer protection panel using the GE Multilin 745 typically includes the following components:
- GE Multilin 745-W2-P15-G5-HI-A-L-R-E-H — Transformer Management Relay (this unit)
- GE Multilin 745 Test Plug / Test Block — for in-service testing without disconnecting CTs
- Current Transformers (CTs) — 1A or 5A secondary, matched to transformer winding ratings
- Voltage Transformers (VTs) — for voltage-dependent protection elements (if applicable)
- DC Power Supply — 110 VDC or 125 VDC station battery supply
- Trip Circuit Supervision Relay — monitors trip coil continuity
- Buchholz Relay / Sudden Pressure Relay — external transformer-mounted gas detection
- SCADA / RTU Interface — for Modbus or DNP3 data acquisition
- EnerVista 745 Setup Software — for configuration and commissioning (PC-based)
Contact support@konmask.com to source a complete BOM package for your transformer protection project.
Compliance & Industry Standards
- IEEE C37.91 — Guide for Protecting Power Transformers
- IEC 60255 — Measuring Relays and Protection Equipment
- IEC 61850 — Communication Networks and Systems in Substations (optional firmware)
- ANSI/IEEE C37.90 — Relays and Relay Systems Associated with Electric Power Apparatus
- CE Marking — European conformity for electrical equipment
- UL Listed — where applicable per regional certification requirements
- ISO 9001 — GE Multilin manufacturing quality management system
Quality Assurance & Sourcing
Konmask.com applies a structured quality process to every GE Multilin 745 unit before shipment:
- Supply Chain Verification: Each unit is cross-referenced against GE Multilin serial number formats and label specifications to confirm authenticity.
- Physical Inspection: Housing, front panel, terminal blocks, and internal PCB markings are inspected for signs of tampering, counterfeit, or damage.
- Functional Check: Where feasible, units undergo power-on verification and communication port testing prior to dispatch.
- Documentation Package: Available certificates of conformance, test records, and packing documentation are included to support your incoming inspection and commissioning process.
Konmask.com operates as an independent industrial parts distributor. GE, GE Multilin, and 745 are trademarks of General Electric Company. Konmask.com is not an authorized GE distributor unless explicitly stated. Buyers requiring OEM-authorized supply should contact GE Grid Solutions directly.
How to Source This Part
- Add to Cart — For standard single-unit orders, proceed directly to checkout.
- Request a Quote — For bulk orders, project pricing, or specific lead time requirements, email support@konmask.com with your purchase order details and required delivery date.
- Submit Your BOM — If you need multiple protection relays or a complete panel BOM, send your full parts list for a consolidated quote.
- Confirm & Ship — We issue a proforma invoice, confirm stock availability, and arrange shipment with full tracking and export documentation.
📞 Phone / WhatsApp: +0086 19859288691
📧 Email: support@konmask.com
🌐 Website: https://Konmask.com
Application-Specific FAQ
Q: What does the model code 745-W2-P15-G5-HI-A-L-R-E-H mean?
A: The GE Multilin 745 model code encodes the relay’s hardware configuration. Key elements: W2 = 2-winding differential protection; P15 = power supply option; G5 = I/O configuration; HI = high-impedance restricted earth fault input; A = analog output; L = LCD display; R = RS-485 communication; E = Ethernet port; H = harmonic metering. Contact us to confirm the exact configuration matches your application requirements.
Q: Can the 745 protect a 3-winding transformer?
A: The W2 variant is designed for 2-winding transformer protection. For 3-winding applications, GE offers the 745-W3 variant. Contact our team to discuss the correct model for your transformer configuration.
Q: Is IEC 61850 GOOSE supported on this unit?
A: IEC 61850 support depends on the firmware version and hardware option (E = Ethernet port included in this model code). Please confirm your firmware requirements at the time of order so we can verify compatibility.
Q: What is the lead time for this relay?
A: In-stock units typically ship within 3–5 business days from our China warehouse. Sourced units may require 7–21 business days depending on availability. Contact us for real-time stock status.
Q: Can you supply the EnerVista 745 software?
A: EnerVista 745 Setup software is available as a free download from GE Grid Solutions. We can assist with configuration guidance and settings templates for common transformer protection applications.
Q: Do you offer on-site commissioning support?
A: We provide remote technical support for relay configuration and commissioning. For on-site support in China and select international locations, contact support@konmask.com to discuss options.
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Contact: support@konmask.com | +0086 19859288691
