SR745-W2-P5-G5-HI High Performance Motor Protection Relay

Description

SR745-W2-P5-G5-HI is a high-performance motor protection relay designed specifically for medium voltage (2.3-15 kV) motors. It integrates current transformers (CT) and voltage transformers (VT) to measure three-phase current, voltage, and power parameters with an accuracy of ± 0.2%. The dual core processor of this relay performs advanced protection functions, including:
Stator differential protection: detects internal faults by comparing the current at the motor terminals and neutral point.
Thermal modeling: Use I ² t algorithm to simulate winding temperature, considering load curve and environmental conditions.
Harmonic analysis: Monitor up to 50 harmonics to identify issues caused by nonlinear loads or insulation aging.

SR745-W2-P5-G5-HI

In automation systems, this relay can be used as an independent protection device or integrated with SCADA systems through Ethernet (IEC 61850, Modbus TCP) or serial protocols. It is equipped with programmable logic input/output (8 DI/8 DO) for interfacing with circuit breakers, frequency converters (VFDs), or emergency shutdown systems. The wide temperature design (-40 ° C to+85 ° C) and conformal coating of this relay ensure reliability in harsh environments, while its embedded web server allows for remote configuration and real-time health monitoring.

SR745-W2-P5-G5-HI

Technical specifications:
Model numberSR745-W2-P5-G5-HI
Brand GE
Type: Medium Voltage Motor Protection Relay
Voltage range 2.3-15 kV (VT input: 110-120V AC/DC)
CT input 1-5A secondary (supports high impedance CT)
Protection functions include stator differential, thermal overload, phase imbalance, grounding fault, and circuit breaker failure
Communication interfaces Ethernet (IEC 61850, Modbus TCP), RS-485 (Modbus RTU)
7-inch color touch screen display (real-time waveform, event log, trend chart)
Installation method: Rack installation (19 inch cabinet, 4U height)
Certification standards IEEE C37.102, IEC 61587, NEC 70E, CE, UL
Dimensions 482 x 177 x 292 mm

Contact Us
Phone:+86 16626708626
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Email: 3772179818@qq.com

SR745-W2-P5-G5-HI

Main features and advantages:
Choosing SR745-W2-P5-G5-HI can bring operational flexibility and efficiency:
Disaster prevention: Stator differential protection reduces maintenance costs by detecting internal faults (such as winding short circuits) before upgrading, and can save up to 70% of motor replacement costs in oil and gas applications.
Predictive maintenance: Thermal trend analysis can identify aging motors or shaft misalignment issues before faults occur, allowing for scheduled maintenance during planned downtime and reducing unplanned downtime by up to 50%.
Grid stability: Advanced fault coordination ensures rapid isolation of faulty motors without cascading effects on the power system, which is crucial for maintaining the reliability of large-scale applications such as hydropower plants.

SR745-W2-P5-G5-HI

Application areas:
Oil and gas: Protecting large compressor motors in refineries and offshore platforms, where saltwater corrosion and high vibration require robust design. The explosion-proof certification of this relay (such as ATEX/IECEx) ensures compliance with regulations in explosive environments.
Electric power generation: used for steam turbine generators and condenser pumps, providing fast acting differential protection to prevent damage caused by stator winding faults in power plants.
Mining: Protecting conveyors and ventilation motors in underground mines, where dust, humidity, and sudden load changes require robust thermal and overload protection. The wide temperature range of this relay ensures operation under extreme weather conditions.

SR745-W2-P5-G5-HI

Related products:
SR745-W3-P5-G6-HI: Suitable for large motors (10+MW), with enhanced harmonic filtering and dual Ethernet ports.
SR745-W2-P5-G5-LO: Low cost version without touch screen display, suitable for basic protection of non critical motors.
SR745-W2-P5-G5-HI-EXT: Extended voltage range (up to 20 kV), suitable for special applications such as industrial arc furnaces.
SR745-W2-P5-G5-HI-R: Redundant power version, suitable for data centers and medical facilities that require 2N reliability.

Installation and maintenance:
Before installation:
Verify the CT/VT ratio and ensure proper grounding to avoid measurement errors in high voltage environments.
Configure differential protection settings using the built-in test mode of the relay, simulate faults within and outside the zone to verify the start-up and lockout characteristics.
For SCADA integration, map Modbus registers or IEC 61850 datasets to the control system data model.
Daily maintenance:
Use a multifunctional relay tester for annual calibration to verify current/voltage accuracy and trip characteristics.
Check for repeated faults (such as phase imbalance) in the event log to identify systemic issues, such as bearing wear or cable aging.
In a humid environment, check for signs of corrosion on the conformal coating and ensure that the ventilation outlet is free of dust.

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