GE Multilin SR745-W2-P1-G1-HI-A-L-R-E Transformer Management

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Product Overview

GE Multilin SR745-W2-P1-G1-HI-A-L-R-E is a high-performance numerical transformer management relay in the famous SR745 series, designed for full protection, metering, monitoring and control of two-winding power transformers in utility substations, power plants and heavy industrial power distribution systems.

Model suffix breakdown:

• SR745: Transformer management relay series
• W2: 2-winding transformer protection configuration
• P1: 1 Amp CT secondary current input
• G1: Ground fault protection function
• HI: High wide-range auxiliary control power
• A: Analog I/O module
• L: Local operator display & keypad
• R: Drawout chassis construction

This relay adopts percentage differential protection with harmonic restraint to avoid false tripping caused by transformer magnetizing inrush current. It integrates overcurrent, overvoltage, undervoltage, overfrequency, underfrequency, overload and ground fault protection. It supports FlexLogic™ programmable logic, fault waveform capture, sequence of event recording and multi-protocol serial communication for SCADA and DCS integration. GE has discontinued the SR745 series. We supply surplus and fully refurbished SR745-W2-P1-G1-HI-A-L-R spare parts for legacy substation transformer cabinet maintenance, avoiding costly full system retrofit.

Key Features

✅ Percentage differential protection with adaptive harmonic restraint for two-winding power transformers ✅ P1 1A CT secondary input, compatible with 1A class current transformers widely used in power substations ✅ G1 integrated sensitive ground fault protection ✅ HI universal high-range control power supply ✅ A option: built-in analog I/O for analog signal input/output ✅ L local front panel display and keypad for on-site parameter setting and fault review ✅ R drawout chassis, hot removable without disconnecting field wiring ✅ FlexLogic™ customizable programmable logic for site-specific protection schemes ✅ Event recorder & oscillographic fault waveform capture for post-fault analysis ✅ Multi-port communication: RS232, RS485, Modbus RTU, DNP3.0, IRIG-B time synchronization ✅ CT ratio mismatch correction and transformer thermal overload monitoring

Technical Specifications

• Model: SR745-W2-P1-G1-HI-A-L-R-E
• Brand: GE Multilin / GE Vernova / GE Grid Solutions
• Product Family: SR745 Transformer Management Relay
• Transformer Winding: W2 (2-winding)
• CT Secondary Input: 1A (P1)
• Control Power (HI): 70–265V AC / 90–300V DC
• Protection: Percentage differential, ground fault, overcurrent, over/under voltage, over/under frequency, thermal overload
• Communication: RS232, RS485, Modbus RTU, DNP3.0, IRIG-B time sync
• Mounting: Panel mount, drawout chassis (R)
• Operating Temperature: -40℃ ~ +70℃
• Humidity: 5% ~95% RH, non-condensing
• Protection Rating: Front IP54, rear IP30
• Certifications: CE, UL, IEC 60255

Applications

GE Multilin SR745-W2-P1-G1-HI-A-L-R-E relays are used for two-winding power transformer protection:

• Utility substation distribution transformers
• Power plant auxiliary step-down transformers
• Industrial large power distribution transformers
• Oil & gas plant main transformers
• Mining heavy industry power transformers
• Replacement spare parts for legacy GE SR745 transformer protection panels

Product Supply Information

We provide fully tested GE Multilin SR745-W2-P1-G1-HI-A-L-R-E transformer management relays for global power and automation buyers. The SR745 series is discontinued by GE. Available stock includes surplus and refurbished units.

• Complete functional, differential protection and communication testing before shipment
• 12-month warranty
• Anti-static packaging, secure export carton
• Shipping options: DHL, FedEx, UPS, sea freight
• Trade terms: EXW, FOB, CIF, DDP

FAQ

Q1: What does -W2-P1-G1-HI-A-L-R suffix mean?

A: W2=2-winding transformer; P1=1A CT secondary input; G1=ground fault protection; HI=high range control power; A=analog I/O; L=local display; R=drawout chassis.

Q2: Is discontinued?

A: Yes, GE Multilin has phased out the SR745 transformer relay series. We supply surplus and fully tested replacement units for legacy transformer protection systems maintenance.

Q3: What is the core protection function of SR745 relay?

A: The core function is percentage differential protection with harmonic restraint, which can identify transformer internal faults and prevent misoperation during magnetizing inrush.

Q4: What is the advantage of R drawout chassis?

A: Drawout design allows technicians to pull out the relay unit for maintenance or replacement without disconnecting field wiring, greatly reducing substation outage time.

Q5: What communication protocols does SR745-W2-P1-G1-HI-A-L-R-E support?

A: RS485 Modbus RTU, DNP3.0, RS232, IRIG-B time synchronization for accurate event timestamping.

GE BRAND

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