GE SR745‑W2‑P1‑G1‑HI‑E‑H Transformer Management Relay

Technical Specifications

Model: SR745‑W2‑P1‑G1‑HI‑E‑H

Brand: GE Multilin (GE Vernova)

Product Type: Digital Transformer Management Protection Relay

Applicable System: Two‑winding power transformer, autotransformer and reactor protection system(W2)

CT Secondary Input: 1A phase current transformer input(P1)

Ground CT Input: 1A ground current input(G1)

Control Power: 70‑265VAC / 90‑300VDC universal high‑range power supply(HI), 48‑62Hz

Display: Enhanced 40‑character multi‑line LCD front‑panel(E)

Hardware Option: H‑option hardware configuration(H)

Temperature Sensor: Support 3‑wire RTD Pt100, Ni100, Ni120 winding‑oil temperature detection

Communication Interface: RS485 Modbus RTU, front‑panel RS232 local programming port

Mounting Mode: Panel flush mounting

Front‑panel Protection Grade: IP40

Relay Output: Multiple groups programmable trip & alarm relay outputs

Analog Output: Configurable 4‑20mA analog output, max load 600Ω

Recording Function: Event log, fault waveform capture, disturbance record, transformer operating‑data trend recording

Logic Function: FlexLogic flexible programmable logic function

Power Consumption: Typical 30VA

Operating Temperature:‑40℃ ~ +60℃, non‑condensing

Humidity:5%‑95% non‑condensing

Weight:1.36kg

Dimension:228mm ×178mm ×114mm

Application: Power plant main‑transformer, substation power transformer, industrial large‑capacity transformer, reactor comprehensive protection

Product Function Description

SR745‑W2‑P1‑G1‑HI‑E‑H belongs to GE Multilin 745 series transformer management relay, specially developed for two‑winding power transformers and autotransformersRS Modules。

This relay integrates complete transformer‑oriented protection, measurement, control and fault‑recording functions. It implements core differential‑protection with inrush‑current restraint, over‑excitation protection, thermal overload protection, phase‑overcurrent & ground‑fault protection, over‑voltage/under‑voltage protection, frequency protection and RTD winding‑oil temperature over‑temperature protection for transformers。

It can real‑time collect current, voltage, power, energy, winding‑oil temperature and other operating parameters. Built‑in disturbance‑recorder captures fault waveforms and stores event logs, helping maintenance engineers quickly analyze fault causes and reduce power‑grid accident‑processing time. Enhanced LCD front‑panel supports local parameter setting, status viewing and fault diagnosis. It adopts Modbus RTU communication to realize remote monitoring and parameter configuration by upper‑level DCS system. FlexLogic flexible logic function can customize protection logic according to on‑site working‑condition requirements。

Product Details

Panel‑mount compact integrated structure, enhanced human‑machine operation front‑panel. Industrial‑grade hardware design adapts to harsh power‑station and substation site environment. This legacy transformer‑management relay has been discontinued by original manufacturer, mainly used for old‑equipment overhaul and spare‑part replacement. Please confirm CT ratio, power‑supply range and communication parameters before commissioning. Strict ESD protection shall be adopted during installation.