GE Multilin SR745-W2-P5-G5-HI Transformer Management Relay

Description

Technical Specifications

Electrical Specifications

• Winding Configuration: W2 = 2 windings per phase (designed for two‑winding transformers)
• Phase Current Input: P5 = 5 A (5A nominal phase CT secondary current for both windings)
• Ground Current Input: G5 = 5 A (5A nominal ground fault current input for restricted earth fault protection)
• Control Power Supply: HI = 90–300 VDC / 70–265 VAC @ 48–62 Hz (universal wide‑range high‑voltage power)
• Voltage Inputs: 3‑phase voltage inputs (60–120 V nominal) for bus/line voltage monitoring
• Digital Inputs: 16 opto‑isolated, programmable digital inputs for breaker status, tap position, and remote control signals
• Relay Outputs: 10 configurable Form A/C relay outputs for tripping, alarming, control, and signaling functions
• Analog Outputs: 7 programmable 4–20 mA / 0–20 mA analog channels for metering and process signaling
• Communication Ports: RS‑232 (front), RS‑485/RS‑422 (rear); supports optional Ethernet (Modbus TCP/IP, DNP3), Profibus, and IEC 61850
• Measurement Accuracy: Current/voltage ±0.2% FS; power ±0.5% FS
• Relay Operating Time: ≤ 1 cycle (≤ 16.6 ms @ 60 Hz) for main protection elements
• Overload Withstand: 1 second at 80 × rated current; continuous operation at 3 × rated current
• Frequency Range: 50/60 Hz (auto‑sensing)

Environmental & Physical Specifications

• Operating Temperature: -40°C to +60°C (-40°F to +140°F)
• Storage Temperature: -40°C to +80°C (-40°F to +176°F)
• Relative Humidity: Up to 90% (non‑condensing)
• Pollution Degree: 2
• Ingress Protection: IP40 (front panel)
• Dimensions: 9” H × 7 ⅛” D × 7” W (228.6 mm × 180.9 mm × 177.8 mm)
• Weight: Approximately 4.8 kg (10.6 lbs)
• Mounting: Panel‑mount with draw‑out chassis design
• Certifications: Compliant with IEEE, ANSI, NEMA, IEC 61010‑1, UL, cUL, and CE standards

Key Features

• Comprehensive Transformer Protection: Delivers complete protection including percentage differential, restricted earth fault, overcurrent, thermal overload, over/undervoltage, over/underfrequency, phase imbalance, overexcitation (V/Hz), loss of life assessment, and tap changer monitoring.
• Ultra‑Fast Fault Clearing: Multi‑processor architecture provides sub‑cycle operating times for critical protection elements, minimizing transformer damage during faults.
• Advanced Thermal Modeling: Implements precise transformer thermal capacity tracking with configurable cooling time constants and thermal memory for accurate overload protection.
• Transformer Health Monitoring: Integrates loss‑of‑life calculation, harmonic analysis (THD monitoring), and tap position tracking to assess long‑term asset health.
• Flexible I/O & Configuration: 16 digital inputs, 10 relay outputs, and 7 analog outputs support custom protection schemes and integration with legacy and modern control systems.
• Enhanced User Interface: Features a 40‑character backlit LCD display and keypad for intuitive local configuration, parameter viewing, and fault diagnostics.
• Event & Fault Recording: Logs 512 time‑stamped events, detailed fault data, and oscillographic waveform captures for rapid troubleshooting and post‑fault analysis.
• Draw‑Out & Hot‑Swappable Design: Allows module replacement without system shutdown, minimizing downtime during maintenance.
• Robust Communication: Supports multiple industrial protocols for seamless integration with PLCs, DCS, SCADA, and power management systems.
• Harsh Environment Resilience: Operates reliably in extreme temperatures and industrial environments with high humidity and vibration.
• Self‑Diagnostics: Built‑in self‑monitoring and fault detection ensures continuous operational integrity.
• EnerVista Software Compatibility: Configurable and monitored via GE’s EnerVista 745 Setup Software for easy setup, remote management, and firmware updates.

Application Scenarios

• Power Generation: Primary protection for step‑up transformers in thermal, hydro, wind, and solar power plants.
• Transmission & Distribution: Protection for distribution transformers, substation transformers, and autotransformers in utility grids.
• Oil & Gas Industry: Transformer protection for onshore/offshore drilling rigs, production platforms, and pipeline pumping stations.
• Mining & Minerals: Protection of power transformers in mining operations, ore processing, and material handling facilities.
• Manufacturing & Industrial Facilities: Transformer management in factories, refineries, chemical plants, and heavy industrial sites.
• Water & Wastewater: Protection for transformers in water treatment plants, pump stations, and desalination facilities.
• Marine & Offshore: Transformer protection for marine vessels, offshore support platforms, and floating production systems.
• Data Centers: Critical transformer protection for mission‑critical data center power distribution systems.
• Commercial Buildings: Transformer management in large commercial complexes, hospitals, and high‑rise buildings.
• Renewable Energy: Integration with wind and solar farms for transformer protection in renewable energy installations.