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Description
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 745-W2-P5-G5-HI-R-E-H |
| Manufacturer | GE Multilin (GE Vernova / GE Grid Solutions) |
| Product Type | Transformer Management Relay / digital protection IED |
| Series | GE Multilin 745 Transformer Protection System |
| Applicability | Two-winding transformers (W2), autotransformers and reactors |
| Nominal Frequency | 50 or 60 Hz, with frequency tracking across the operating band |
| Phase Current Input | 5 A secondary (P5), CT primary 1–50000 A, burden < 0.2 VA per phase |
| Ground Current Input | 5 A secondary (G5), burden < 0.2 VA |
| Conversion Range | 0.02 to 46 × CT; accuracy ±0.25 % below 4 × CT, ±0.5 % above |
| Overload Withstand | 1 s at 80 × rated, 2 s at 40 × rated, continuous at 3 × rated |
| Voltage Input | 60–120 V phase-to-neutral, VT ratio 1–5000, burden < 0.025 VA at 120 V, 273 V continuous |
| Control Power | HI range: 90–300 V DC or 70–265 V AC at 48–62 Hz |
| Power Consumption | 30 VA nominal, 40 VA maximum; internal fuse 3.15 A, 5 × 20 mm slow-blow |
| Logic Inputs | 16 (dry contacts 1000 Ω max ON resistance; wet contacts 30–300 V DC) |
| Output Relays | 8 total — relays 2–5 Form A (breaker trip rated), 6–8 Form C auxiliary, plus self-test Form C |
| Contact Rating | Silver alloy, 300 V AC / 250 V DC, 15 A, 1500 VA |
| Solid-State Trip Output | SCR, make and carry 15 A at 250 V DC for 500 ms |
| Analog Outputs | 7 channels, 0–1 / 0–5 / 0–10 / 0–20 / 4–20 mA, fully isolated, ±1 % of full scale |
| RTD Input | 3-wire, 100 Ω platinum (DIN 43760), 100 Ω nickel, 120 Ω nickel |
| Tap Position Input | Resistance type, 0–500 Ω or 0.5–5.0 kΩ |
| Analog Transducer Input | 0–1 / 0–5 / 0–10 / 0–20 / 4–20 mA, 375 Ω ±10 % |
| Communications | Front RS232, rear dual RS485/RS422, optional 10 Mbps Ethernet; Modbus RTU, DNP 3.0 Level 2, Modbus TCP/IP |
| Time Synchronisation | IRIG-B input; 1 ms clock resolution, ±1 ms with IRIG-B, battery backup 10 years |
| Display and Indication | Enhanced 40-character backlit LCD, 20 status LEDs, keypad setpoint entry |
| Recording | Last 128 time-stamped events; oscillography with combined 16 pre- and post-trigger cycles |
| Operating Temperature | −40 °C to +60 °C ambient; storage −40 °C to +80 °C |
| Humidity and Altitude | Up to 90 % non-condensing; up to 2000 m; pollution degree II |
| Enclosure Protection | IP40 front, IP20 rear |
| Type Tests | Dielectric 2300 V AC, 5 kV impulse, 2 g vibration, 15 kV/8 kV ESD, 4 kV EFT, 4 kV surge |
| Approvals | CE, UL listed (E83849) for USA and Canada, cUL, FCC Part 15, IEC 1010-1, ISO 9001 |
| Dimensions and Weight | Approx. 9 in H × 7 in W × 7⅛ in D; approx. 4.8 kg net |
| Mounting | Draw-out case for panel or 19-inch rack mounting |
Main Features and Advantages
Protection depth that covers the whole transformer: The GE Multilin 745-W2-P5-G5-HI-R-E-H was designed as a complete transformer protection package rather than a differential relay with extras. Percentage differential with second- and fifth-harmonic restraint handles internal faults while staying stable through magnetising inrush; the restricted ground fault element (the R option in this build) gives sensitive detection of winding-to-earth faults close to the neutral that plain differential may miss; phase, neutral, ground and negative-sequence overcurrent elements provide backup; and over-excitation (V/Hz) protection guards against the over-fluxing that damages core steel.Adaptive behaviour under real system conditions: Fixed settings are a poor match for a transformer that sees inrush, through-faults, harmonic-rich loads and tap changes. The GE 745-W2-P5-G5-HI-R-E-H adapts: harmonic restraint blocks tripping during energisation, adaptive time-overcurrent elements adjust pickup according to calculated transformer capability when load current carries high harmonic content, dynamic CT ratio mismatch correction tracks the on-load tap position and compensates automatically, and up to four selectable setpoint groups let one relay serve different system configurations.Asset management, not just tripping: The relay continuously converts electrical and thermal data into information an asset manager can act on. It computes hottest-spot temperature, aging factor and loss of life over the long term, giving operators the evidence to decide when to re-rate, re-load or replace a transformer on economic grounds instead of guessing. Individual harmonic and THD measurement per winding shows how power quality is affecting the asset.Diagnostics that shorten the post-mortem: With 128 time-stamped events, 1 ms clock resolution via IRIG-B, and oscillographic capture of combined pre- and post-fault cycles, the GE Multilin 745-W2-P5-G5-HI-R-E-H records what actually happened rather than leaving the sequence to be reconstructed from scattered SCADA trends. Integrated COMTRADE and sequence-of-events viewers in the EnerVista 745 Setup software turn those records into a readable fault narrative.FlexLogic and communications: Sixteen logic inputs, seven analog outputs, eight output relays and a high-speed solid-state trip output can all be assigned through FlexLogic equations, so schemes are programmed rather than hard-wired. Three serial ports plus optional Ethernet, running Modbus RTU, DNP 3.0 Level 2 and Modbus TCP/IP, allow simultaneous local and SCADA communication without protocol converters.Built for the environment, and serviceable in place: The H option on the GE 745-W2-P5-G5-HI-R-E-H applies conformal coating for corrosive or high-humidity locations, backed by type-tested immunity to ESD, fast transients, surge, RF fields and vibration. The draw-out case with CT shorting on withdrawal means the relay can be exchanged in a live panel without disturbing the wiring.
Application Field
The GE Multilin 745-W2-P5-G5-HI-R-E-H is applied as the primary protection and management device for two-winding power transformers, autotransformers and reactors. In utility transmission and distribution substations it is the standard choice for incoming and outgoing transformer bays, where its differential element clears internal faults quickly while its overcurrent functions provide backup for downstream faults and breaker failure. Industrial facilities — refineries, petrochemical plants, steel and cement works, mines — use the same relay on main intake and unit substation transformers, where a transformer failure would stop production rather than simply inconvenience customers.The combination of options in this particular build points to a demanding installation. The 5 A CT rating suits conventional substation CT secondaries; the HI control power range covers the 125 V DC and 250 V DC station battery supplies common in utility and industrial switchgear as well as 110–240 V AC supplies; and the conformal coating makes the GE 745-W2-P5-G5-HI-R-E-H appropriate for coastal, chemical, pulp and paper, wastewater and other corrosive or humid locations where a standard board would eventually succumb.In practice three situations drive the demand. First, new protection panels and retrofit projects, where a two-winding transformer needs a single device covering differential, restricted earth fault, overcurrent, thermal and over-excitation duties. Second, replacement of failed or ageing 745 relays in existing panels — the draw-out case makes the GE Multilin 745-W2-P5-G5-HI-R-E-H a direct mechanical and electrical swap, avoiding a panel redesign. Third, life-extension and spare-parts strategies for substations where the surrounding switchgear is sound but the original relays are now obsolete, and where keeping a tested unit on the shelf is the difference between a same-day restoration and an extended outage.
Related Products
745-W3-P5-G5-HI-R-E-H — the three-winding version of the same relay; select it when the protected transformer has a tertiary winding that must be included in the differential scheme.745-W2-P5-G5-HI — the base configuration without the R, E and H options; the entry point in the family for benign indoor environments with basic display requirements.745-W2-P5-G5-HI-A-R-E — variant adding the A option (analog inputs/outputs) for transducer-based monitoring while retaining restricted ground fault and the enhanced display.745-W2-P5-G5-HI-A-L-R-E-H — the fully optioned build, adding the A analog I/O and L loss-of-life options to the 745-W2-P5-G5-HI-R-E-H configuration with conformal coating.745-W2-P5-G5-LO-A-L-R-E — the low-control-power variant (20–60 V DC / 20–48 V AC) for stations with 24 V or 48 V DC battery supplies; electrically the same relay with a different power supply range.745-W2-P1-G1-HI-R-E — the 1 A CT version; required where the installation uses 1 A secondary current transformers rather than the 5 A inputs of the 745-W2-P5-G5-HI-R-E-H.745-W2-P5-G5-HI-B — the basic-display variant, specified where a smaller LCD is acceptable and cost is the deciding factor.745-W2-WP5-G5-HI — a two-winding variant in the same family configured with a wide-range power supply for mixed AC/DC substation supplies.SR745 / SR-series draw-out case and terminal blocks — the mounting hardware, rear terminal assembly and draw-out case that host the 745-W2-P5-G5-HI-R-E-H; keeping spare cases and terminals simplifies field replacement.GE Multilin T60 — the UR-series transformer protection relay and the modern functional successor to the 745 platform, used when a substation is migrated to current-generation hardware.
