Product Details:

The GE SR745-W3-P5-G5-HI three winding transformer management relay is an advanced microprocessor-based protection and monitoring unit from GE Multilin 745 series, designed specially for three-winding power transformers, autotransformers and reactors in power plants and high voltage substations. This three winding transformer management relay integrates variable dual-slope percentage differential protection, harmonic restraint inrush blocking, restricted earth fault protection, phase overcurrent, thermal overload, overexcitation, overvoltage and undervoltage protection. It continuously monitors winding current, bus voltage and transformer temperature, calculates transformer loss of life and tracks on-load tap changer operation status in real time. As a reliable multilin transformer protection relay, it supports high-speed fault waveform capture and time-stamped event logging, storing fault data for post-fault analysis by field engineers. The front panel features a 40-character LCD display and operation keypad, together with LED status indicators for operators to view real-time electrical measurements, alarm messages and protection setting parameters conveniently. It supports multiple communication protocols including Modbus and DNP3, enabling stable data exchange with SCADA and DCS control systems for remote monitoring and parameter configuration. This relay adopts draw-out hot-swappable structure, which can reduce system downtime during maintenance. Internal circuit boards are coated with conformal coating to defend against dust, moisture, corrosive gas and mechanical vibration in harsh substation environments. As an essential ge power protection relay, it is widely deployed in thermal power stations, hydroelectric power plants, wind farm step-up substations and petrochemical power systems. When the original relay suffers protection malfunction, measurement deviation or component aging, this replacement spare part can be installed to restore full transformer protection and monitoring functions, prevent transformer damage caused by electrical faults and guarantee stable power grid operation. Every relay undergoes complete protection characteristic testing and communication verification before shipment to ensure stable and reliable performance.

Specifications:

Brand: GE

Model: SR745-W3-P5-G5-HI

Product Type: Three Winding Transformer Management Relay

Series: Multilin 745 Series

Core Protection: Percentage differential protection, harmonic restraint inrush blocking, restricted earth fault, overcurrent, thermal overload, overexcitation

Data Recording: Fault waveform capture, time stamped event log

Communication: Modbus, DNP3 protocol

Display: 40-character front panel LCD display and operation keypad

Structure: Draw-out hot-swappable design

Mounting: Panel mounting

PCB Feature: Conformal coated multi-layer PCB

Operating Temperature: -40℃ ~ +60℃

Environmental Feature: Anti-vibration, dust and moisture resistant

Weight: Approx 4.8kg