GE Multilin 745-W2-P5-G5-HI-A-R-E – Transformer Management Relay | Multilin 745 Series
Engineering Background
The GE Multilin 745 is a dedicated transformer protection and management relay engineered for power utilities, industrial substations, and critical infrastructure. Designed to IEC and ANSI standards, the 745 platform delivers comprehensive differential, overcurrent, and thermal protection in a single integrated unit — eliminating the need for multiple discrete relays and reducing panel footprint.
Product Positioning
The 745-W2-P5-G5-HI-A-R-E variant is configured for dual-breaker applications with 5 A CT inputs, GOOSE messaging over IEC 61850, a front-panel HMI display, RS-485 serial communications, and enhanced I/O. It is the preferred choice for procurement engineers specifying protection schemes on medium-voltage power transformers in generation, transmission, and heavy industrial environments.
Complete Technical Specifications
- Model: 745-W2-P5-G5-HI-A-R-E
- Manufacturer: GE Grid Solutions (GE Multilin)
- Series: Multilin 745 Transformer Management Relay
- CT Input Rating: 5 A nominal (P5 option)
- Breaker Configuration: Dual-breaker (W2)
- Communication Protocol: IEC 61850 with GOOSE messaging (G5); RS-485 Modbus RTU (R)
- HMI: Front-panel LCD display with keypad (HI)
- I/O Expansion: Enhanced I/O module (E option)
- Power Supply: AC/DC universal auxiliary supply (A)
- Protection Functions: 87T Differential, 50/51 Overcurrent, 49 Thermal, 46 Negative Sequence, 59/27 Over/Undervoltage, 81 Frequency, 63 Buchholz, 26 Oil Temperature
- Mounting: 19-inch rack / panel flush mount
- Weight: 7.52 kg
- Standards Compliance: IEC 60255, ANSI/IEEE C37.90, IEC 61850 Ed.2
Proven Application Environments
- Medium- and high-voltage substation transformer bays (11 kV – 220 kV)
- Power generation step-up and unit transformers
- Industrial plant main transformers (steel, petrochemical, mining)
- Renewable energy collector substations (wind, solar)
- Data center and critical facility MV switchgear
- Railway traction power substations
Engineering Advantages
- Integrated differential protection with harmonic restraint eliminates inrush-related false trips
- IEC 61850 GOOSE enables peer-to-peer tripping without hardwired interposing relays, reducing wiring cost and latency
- Dual-breaker logic natively handles transformer bays with separate HV and LV breakers
- Thermal model tracks winding hot-spot temperature for load optimization and life extension
- Front HMI provides real-time metering, event log, and fault record without a laptop
- Enhanced I/O supports complex interlock and SCADA schemes without external logic controllers
System Architecture & Signal Flow
The 745 relay accepts three-phase CT and VT inputs from both the HV and LV windings of the protected transformer. Internal DSP continuously computes differential current, restraint current, and harmonic content. Trip decisions are issued to dual-breaker output contacts within <1 cycle for differential faults. Simultaneously, IEC 61850 GOOSE messages are published to the station LAN for bus protection coordination. Metering data and event records are accessible via the front HMI, RS-485 Modbus, or IEC 61850 MMS reporting to the substation SCADA/DCS.
Sourcing & Quality Verification
- Units sourced from authorized GE Multilin distribution channels and verified OEM surplus
- Each unit inspected for firmware version, configuration integrity, and physical condition prior to dispatch
- Original GE documentation, test records, and calibration certificates available on request
- Konmask.com maintains traceability records for all GE Multilin inventory
- Counterfeit-risk mitigation: serial number verification against GE product database available for critical projects
Procurement Process
- Step 1: Submit RFQ via support@konmask.com or add to cart for standard pricing
- Step 2: Receive quotation with lead time, firmware version, and condition report within 24 hours
- Step 3: Confirm purchase order — payment via T/T, L/C, or online checkout
- Step 4: Unit ships with full documentation; DHL / FedEx express available for urgent projects
- Step 5: Post-delivery technical support via email or WhatsApp
Technical FAQ
Q: Is the 745-W2-P5-G5-HI-A-R-E compatible with IEC 61850 Edition 2?
A: Yes. The G5 communication option supports IEC 61850 Ed.2 including GOOSE and MMS reporting.
Q: Can the relay be reconfigured for 1 A CT inputs?
A: No. The P5 hardware option is factory-set for 5 A CT inputs. A separate P1 variant is required for 1 A CT systems.
Q: What firmware version is supplied?
A: Firmware version is confirmed at time of quotation. Konmask can supply units with specific firmware versions on request.
Q: Is factory acceptance testing (FAT) documentation available?
A: Original GE FAT records are available for new and near-new units. Contact us to confirm availability for your specific serial number.
Q: What is the typical lead time?
A: In-stock units ship within 1–3 business days. For units requiring sourcing, lead time is 5–15 business days depending on origin.
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