{"product_id":"ge-745-w2-p5-g5-hi-transformer-protection-relay","title":"GE 745-W2-P5-G5-HI Transformer Protection Relay","description":"\u003cp\u003eThe \u003cstrong\u003eGE Multilin 745-W2-P5-G5-HI\u003c\/strong\u003e (also designated with the \u003cstrong\u003e-AR\u003c\/strong\u003e suffix package) belongs to the \u003cstrong\u003e745\u003c\/strong\u003e Transformer Protection System series. It operates as a high-speed, multi-processor transformer management relay engineered to protect and manage two-winding power transformers within industrial and utility power automation systems. This base unit configuration integrates percentage differential protection, harmonic analysis, overexcitation elements, and programmable control logic into a modular platform.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Part Number\u003c\/td\u003e\n\u003ctd\u003e745-W2-P5-G5-HI (Alternative catalog string: 745-W2-P5-G5-HI-AR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eGE Multilin (GE Vernova \/ GE Grid Solutions)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003e745 Transformer Protection System\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWinding Capacity\u003c\/td\u003e\n\u003ctd\u003eBase unit configuration supporting two (2) windings per phase (W2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePhase Current Input\u003c\/td\u003e\n\u003ctd\u003e5 A secondary current transformer matching (P5)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGround Current Input\u003c\/td\u003e\n\u003ctd\u003e5 A secondary current transformer matching (G5)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Power Range\u003c\/td\u003e\n\u003ctd\u003eHigh-range (HI) module: 90 to 300 V DC or 70 to 265 V AC at 48 to 62 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Frequency\u003c\/td\u003e\n\u003ctd\u003e50 or 60 Hz nominal tracking\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to +60 deg C (-40 to +140 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to +80 deg C (-40 to +176 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHumidity Boundary\u003c\/td\u003e\n\u003ctd\u003eUp to 90% non-condensing operating environment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnalog Input Impedance\u003c\/td\u003e\n\u003ctd\u003e375 ohm +\/-10%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTap Position Range\u003c\/td\u003e\n\u003ctd\u003eDual range: 0 to 500 ohm or 0.5 to 5.0 k-ohm monitoring limits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePhysical Chassis\u003c\/td\u003e\n\u003ctd\u003eStandard SR-series draw-out relay with a companion outer case\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLocal HMI Interface\u003c\/td\u003e\n\u003ctd\u003eFront-panel 40-character LCD display, status indicators, keypad, and control keys\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConfiguration Link\u003c\/td\u003e\n\u003ctd\u003eFront-panel RS232 interface programming port running EnerVista 745\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eBackplane Bus Communication Velocity and Firmware Architecture\u003c\/h3\u003e\n\u003cp\u003eThe multi-processor core inside the 745 series relies on an optimized data bus structure to maintain high communication velocity across its internal backplane. Maintaining precise firmware flash compatibility across all active registers allows the system to continuously capture and cross-reference variables from the 5 A winding inputs, ground transformers, and analog tap changers simultaneously.\u003c\/p\u003e\n\u003cp\u003eAnalog signals enter the relay through shielded isolation loops where they are converted into high-resolution digital data streams. The core processing plane ingests these streams in real time to compute percentage differential equations, individual harmonics, and Total Harmonic Distortion (THD). When a fault condition matches the configured parameters, trip commands are executed down to millisecond intervals, bypassing typical bus latency to actuate external breakers while logging waveform captures and diagnostic event states instantly.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How does the harmonic monitoring subsystem inside the 745-W2-P5-G5-HI prevent nuisance trips during transformer energization?\u003c\/p\u003e\n\u003cp\u003eA: When a power transformer is first energized, it generates a high-magnitude inrush current that can look like an internal short circuit to standard overcurrent relays. The 745 model computes individual harmonics—specifically targeting the 2nd and 5th harmonic components—and uses a percentage differential blocking function. Because transformer inrush contains high harmonic content compared to actual faults, the relay identifies the state and blocks accidental trip execution.\u003c\/p\u003e\n\u003cp\u003eQ: What safety precautions are integrated into the SR-series draw-out chassis regarding current transformer lines?\u003c\/p\u003e\n\u003cp\u003eA: The SR-series companion outer case features integrated, automatic mechanical shorting bars on its backplane terminal plate. When a technician extracts the inner relay unit for calibration or testing, these shorting mechanisms mechanically bridge the 5 A phase and ground current transformer secondary circuits before they can break connection. This prevents hazardous high-voltage open-circuit arcs across the active current loops.\u003c\/p\u003e","brand":"GE Fanuc","offers":[{"title":"Default Title","offer_id":47613856972990,"sku":"745-W2-P5-G5-HI","price":320.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/screenshot_2026-06-05_17-08-20_9c838c6b-6afb-4455-82f3-89eac162a17c.png?v=1780884462","url":"https:\/\/www.autooiltech.com\/es\/products\/ge-745-w2-p5-g5-hi-transformer-protection-relay","provider":"AutoOilTech Limited","version":"1.0","type":"link"}