Transformer Protection Solution – GE 745-W3-P5-G5-HI-A-L-R-E-H | 745 Series Differential Relay
The GE 745-W3-P5-G5-HI-A-L-R-E-H is a high-performance transformer differential protection relay from GE Grid Solutions’ renowned 745 Series. Engineered for mission-critical power infrastructure, this relay delivers fast, selective, and dependable protection for two- and three-winding power transformers in utility substations, industrial plants, and renewable energy facilities worldwide.
Where This Product Is Used
The GE 745 relay is specified by protection engineers across a wide range of high-stakes electrical environments:
- Utility Transmission & Distribution Substations — Primary protection for HV/MV power transformers (11 kV to 500 kV), replacing aging electromechanical relays with modern numerical protection.
- Industrial Manufacturing Plants — Steel mills, cement plants, chemical facilities, and automotive assembly lines rely on the 745 to protect main incoming transformers and prevent costly unplanned shutdowns.
- Oil & Gas Upstream/Downstream — Offshore platforms, refineries, and pipeline compressor stations use this relay where transformer faults can trigger catastrophic consequences.
- Renewable Energy & Grid Interconnection — Wind farm collector transformers and solar PV step-up transformers benefit from the 745’s sensitive differential element and harmonic restraint.
- Data Centers & Critical Infrastructure — Hyperscale data centers and hospital power systems deploy the 745 for N-1 redundancy schemes protecting medium-voltage transformers.
- Mining Operations — Surface and underground mining installations use the 745 to protect large drive transformers powering conveyors, hoists, and crushers.
- Railway Traction Power — Traction substations protecting Scott-T and single-phase traction transformers in electrified rail networks.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | 745-W3-P5-G5-HI-A-L-R-E-H |
| Series | GE 745 Transformer Management Relay |
| Manufacturer | GE Grid Solutions (formerly GE Multilin) |
| Protection Function | Transformer Differential (87T), Overcurrent (50/51), Earth Fault (50N/51N), Restricted Earth Fault (64), Overfluxing (24), Thermal (49) |
| Winding Configuration | W3 — Three-winding transformer protection |
| CT Input Rating | P5 — 5 A nominal CT secondary |
| Communication | G5 — IEC 61850 GOOSE + DNP3 + Modbus RTU |
| I/O Configuration | HI — High-density I/O (16 DI / 12 DO) |
| Power Supply | A — 125/250 Vdc / 120/240 Vac universal |
| Display | L — Large graphical LCD with keypad |
| Redundant Comms | R — Redundant Ethernet (IEC 62439-3 PRP/HSR) |
| Enhanced Recording | E — Extended oscillography & event log |
| Harmonic Restraint | H — 2nd and 5th harmonic blocking |
| Operating Temperature | -40°C to +60°C |
| Mounting | 19″ rack / flush panel (4U) |
| Weight | Approx. 7.6 kg |
| Standards Compliance | IEC 60255, IEEE C37.90, UL, CE |
Why Engineers Specify This Model
- Three-Winding Capability (W3) — Simultaneously protects all three windings of auto-transformers and three-winding units with independent differential zones, eliminating the need for separate relays.
- IEC 61850 Native (G5) — Full GOOSE messaging and MMS reporting enable seamless integration into modern digital substations without protocol converters.
- Harmonic Restraint (H) — 2nd harmonic blocking prevents false trips during transformer energization (inrush), while 5th harmonic blocking guards against overexcitation conditions.
- Redundant Ethernet (R) — PRP/HSR redundancy ensures zero-recovery-time network failover, meeting the highest availability requirements for critical grid assets.
- High-Density I/O (HI) — 16 digital inputs and 12 output contacts accommodate complex interlocking, SCADA signaling, and breaker control schemes without external I/O expanders.
- Extended Oscillography (E) — Captures pre- and post-fault waveforms at high sampling rates, enabling precise post-event analysis and root-cause determination.
- Universal Power Supply (A) — Accepts 125/250 Vdc and 120/240 Vac, simplifying installation across diverse substation battery systems globally.
Complete System Bill of Materials
For a complete transformer protection scheme using the GE 745, engineers typically specify the following companion components:
- GE 745 Relay (this unit) — Primary differential protection
- GE F60 Feeder Protection Relay — Backup overcurrent protection on feeder bays
- GE B30 Bus Differential Module — Busbar protection coordination
- GE D60 Line Distance Relay — Transmission line backup protection
- GE EnerVista 745 Setup Software — Configuration, commissioning, and event retrieval
- GE LPCT / Conventional CTs (5A secondary) — Current measurement inputs
- GE CVT / Capacitor Voltage Transformers — Voltage measurement for overfluxing element
- IEC 61850 Managed Ethernet Switch (PRP/HSR capable) — Station bus communication
- DC UPS / Battery Charger (125 Vdc) — Auxiliary power supply
- Test Plug & Secondary Injection Test Set — Commissioning and periodic testing
Contact us for complete BOM pricing and availability on any of the above components.
Compliance & Industry Standards
- IEC 60255 — Measuring relays and protection equipment
- IEEE C37.90 / C37.90.1 / C37.90.2 — Relays for AC electrical systems; surge withstand; radiated electromagnetic interference
- IEC 61850 — Communication networks and systems in substations
- IEC 62439-3 — High-availability automation networks (PRP/HSR)
- UL 508 — Industrial control equipment
- CE Marking — European conformity (EMC Directive 2014/30/EU, LVD 2014/35/EU)
- NERC CIP — Cybersecurity-ready architecture for North American utilities
Quality Assurance & Sourcing
At Konmask.com, every GE 745 relay undergoes a rigorous 4-step verification process before shipment:
- Physical Inspection — Serial number, firmware label, and housing integrity checked against GE factory records.
- Functional Power-On Test — Unit is energized; self-diagnostics, display, and communication ports are verified operational.
- Documentation Package — Original GE test certificates, calibration records, and instruction manuals (GEK-106310) provided where available.
- Secure Packaging — Anti-static foam, moisture barrier, and double-wall carton with shock indicators for international freight.
We source exclusively from authorized GE Grid Solutions distributors, decommissioned utility inventories with full traceability, and certified surplus dealers — never from unverified grey-market channels.
How to Source This Part
- Add to Cart — Click “Add to Cart” to reserve stock at the listed price.
- Request a Quote — For volume orders (2+ units), OEM integrators, or EPC contractors, email support@konmask.com for a formal quotation with lead time confirmation.
- Provide Your PO — We accept purchase orders from registered companies. Net-30 terms available for qualified accounts.
- Shipping Options — DHL Express (3–5 days), FedEx International Priority, or sea freight for bulk orders. Export documentation (commercial invoice, packing list, COO) included.
- Technical Pre-Sales Support — Our engineers can review your single-line diagram and confirm this model meets your protection coordination requirements before purchase.
Application-Specific FAQ
Q: Can the GE 745-W3 protect a two-winding transformer?
A: Yes. The W3 designation supports up to three windings, but it is fully configurable for two-winding applications. The unused winding inputs are simply disabled in EnerVista software.
Q: What firmware version does this unit ship with?
A: Firmware version is confirmed at time of shipment and documented in the test report. Contact us to specify a minimum firmware revision if required for your SCADA compatibility.
Q: Is this relay compatible with IEC 61850 Edition 2?
A: The G5 communication option supports IEC 61850 Ed. 1 and Ed. 2 SCL/CID configuration. Confirm your IED configurator version with your system integrator.
Q: Do you provide the EnerVista 745 Setup Software?
A: EnerVista software is available as a free download from GE Grid Solutions. We can provide the settings file (.745) from a previously commissioned identical unit as a starting template upon request.
Q: What is the warranty on this unit?
A: We offer a 90-day functional warranty on all tested units. Extended warranty and on-site commissioning support are available — contact us for details.
Q: Can you supply the GE 745 with a factory calibration certificate?
A: Original factory calibration certificates are provided where available. For units requiring fresh calibration, we can arrange third-party NIST-traceable calibration prior to shipment.
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