GE Multilin SR745-W2-P5-G5-HI Transformer Management Relay for 2-Winding Transformers

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Product Overview

GE Multilin SR745-W2-P5-G5-HI is a high-speed numerical transformer management relay in the SR745 series, built for full protection, metering, monitoring and control of two-winding power transformers, autotransformers and shunt reactors 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
• P5: 5 Amp phase CT secondary current input
• G5: 5 Amp ground current input for restricted earth fault (REF) protection
• HI: High wide-range auxiliary control power supply

This relay uses percentage differential protection with harmonic restraint to prevent false tripping caused by transformer magnetizing inrush. It integrates restricted ground fault, overexcitation, overcurrent, overvoltage, undervoltage, overfrequency, underfrequency and thermal overload protection. It supports FlexLogic™ programmable logic, fault oscillography, 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-P5-G5-HI 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 ✅ P5 5A phase CT secondary input, compatible with standard 5A phase current transformers ✅ G5 5A ground CT input for sensitive restricted earth fault protection ✅ HI universal high-range control power: 70–265V AC / 90–300V DC, 48–62Hz ✅ FlexLogic™ customizable programmable logic for site-specific transformer protection schemes ✅ Event recorder & oscillographic fault waveform capture for post-fault diagnostics ✅ Multi-port communication: RS232, RS485, Modbus RTU, DNP3.0, IRIG-B time synchronization ✅ CT ratio mismatch correction and transformer thermal overload monitoring ✅ Supports RTD inputs for transformer winding and hot-spot temperature monitoring

Technical Specifications

• Model: SR745-W2-P5-G5-HI
• Brand: GE Multilin / GE Vernova / GE Grid Solutions
• Product Family: SR745 Transformer Management Relay
• Transformer Winding: W2 (2-winding)
• Phase CT Secondary Input: 5A (P5)
• Ground CT Secondary Input: 5A (G5)
• Control Power (HI): 70–265V AC, 90–300V DC, 48~62Hz
• Protection: Percentage differential, restricted earth fault, overexcitation, overcurrent, over/under voltage, over/under frequency, thermal overload
• Communication: RS232, RS485, Modbus RTU, DNP3.0, IRIG-B time sync
• Mounting: Panel mount
• 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-P5-G5-HI relays are widely deployed for two-winding power transformer protection:

• Utility distribution substation transformers
• Power plant auxiliary step-down transformers
• Large industrial plant main distribution transformers
• Oil & gas facility power transformers
• Mining heavy industry power transformers
• Replacement spare parts for legacy GE SR745 transformer protection panels requiring 5A ground REF CT

Product Supply Information

We provide fully tested GE Multilin SR745-W2-P5-G5-HI 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 SR745-W2-P5-G5-HI suffix mean?

A: W2=2-winding transformer; P5=5A phase CT secondary; G5=5A ground CT for restricted earth fault; HI=high wide-range control power supply.

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 difference between P1 and P5 for SR745?

A: P1 = 1A phase CT secondary; P5 = 5A phase CT secondary. P5 is the most common selection for standard 5A CT used in many substations.

Q4: What is G5 option?

A: G5 means 5A ground current input, dedicated for restricted earth fault (REF) protection to detect winding ground faults.

Q5: What communication protocols does SR745-W2-P5-G5-HI support?

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

GE BRAND

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