GE SR745-W2-P5-G5-HI-A – Multilin 745 Transformer Protection Relay

Technical Specifications

• Manufacturer: General Electric (GE) Multilin
• Model: SR745-W2-P5-G5-HI-A
• Type: Transformer Protection & Management Relay
• Configuration: Two windings per phase; 5 A phase / ground current inputs
• Control Power: 90–300 V DC; 70–265 V AC, 48–62 Hz
• Analog Inputs: 0–1 mA / 4–20 mA; 0–300 V AC/DC
• Analog Outputs: 7 outputs; max 10 kΩ (0–1 mA), 600 Ω (4–20 mA)
• Display: 40‑character enhanced LCD with keypad
• Communication: RS‑232 (front), dual RS‑485 (rear); Modbus, IEC 61850 (optional)
• Protection Functions: Percent differential, overcurrent, overvoltage, overexcitation, restricted ground fault, harmonic monitoring
• 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: 5%–95% (non‑condensing)
• Altitude: Up to 2,000 m (6,562 ft)
• Protection Class: IP40 (front), IP20 (rear)
• Dimensions (H×W×D): 230 mm × 160 mm × 50 mm (9.06” × 6.30” × 1.97”)
• Weight: Approx. 1.8 kg (4.0 lbs)

Key Features

1. Comprehensive Transformer Protection
   • Integrates percent differential, overcurrent, overexcitation, restricted ground fault, and harmonic protection to cover all common transformer faults.
   • Adaptive harmonic restraint prevents false tripping during inrush conditions.
   • Dynamic CT‑ratio mismatch correction adjusts for on‑load tap changer positions automatically.
2. High‑Speed & High‑Precision Performance
   • Multi‑processor architecture ensures 1 ms fault detection and tripping for minimal damage.
   • Precision measurement of currents, voltages, power, and harmonics (individual and THD).
   • Four configurable setpoint groups for dynamic adaptation to varying system conditions.
3. Flexible Communication & Monitoring
   • Multiple ports: RS‑232 (front for local connection), dual RS‑485 (rear for multi‑drop networks).
   • Supports Modbus RTU/TCP and IEC 61850 for seamless integration with SCADA and DCS systems.
   • Compatible with GE EnerVista 745 software for remote configuration, monitoring, and trend analysis.
4. User‑Friendly Interface
   • 40‑character enhanced LCD with backlight for clear real‑time status, fault messages, and metering data.
   • Tactile keypad for easy local setpoint entry and navigation.
   • LED indicators for power, alarm, trip, and communication status.
5. Rugged & Reliable Design
   • Wide operating temperature range (-40°C to +60°C) for harsh industrial environments.
   • Compact, draw‑out chassis for easy installation and maintenance.
   • Conformal coating option available for corrosion and moisture resistance.

Application Scenarios

• Power Generation
  • Power Plants: Protects main and auxiliary transformers in thermal, hydro, and combined‑cycle power stations.
  • Substations: Used in transmission and distribution substations for transformer bank protection.
• Process Industries
  • Oil & Gas: Safeguards transformers in refineries, LNG plants, and pipeline pumping stations.
  • Chemical & Petrochemical: Protects critical process transformers in harsh, corrosive environments.
  • Metallurgy: Ensures reliable operation of transformers in steel, aluminum, and metal processing plants.
• Industrial & Commercial Facilities
  • Manufacturing Plants: Protects distribution transformers in automotive, paper, textile, and pharmaceutical factories.
  • Data Centers & Large Buildings: Provides primary protection for critical power transformers in high‑reliability environments.