GE PQM-T20-A (PQM II) – Power Quality Meter

Technical Specifications

• Manufacturer: General Electric (GE) / GE Multilin
• Model: PQM-T20-A (PQM II Series)
• System Compatibility: Three-phase (3P/3P4W) power systems
• Measurement Parameters: Voltage (L-L/L-N), current, real/reactive/apparent power, power factor, frequency (45–65 Hz), harmonics (up to 50th), flicker, unbalance, energy (kWh/kVARh)
• Accuracy Class: ±0.2% (voltage/current), ±0.5% (power/energy)
• Analog Outputs: 4 isolated outputs (0–20 mA / 4–20 mA, configurable)
• Digital I/O: 4 switch inputs (status monitoring), 4 relay outputs (alarm/control, 5A @ 250 VAC)
• Communication Ports: RS485 (Modbus RTU/DNP 3.0), RS232; optional Ethernet (Modbus TCP)
• Data Storage: 500 voltage sag/swell events (VDR), 12 months of historical data, waveform capture (up to 1024 samples/cycle)
• Power Supply: 70–265 VAC / 90–300 VDC, 50/60 Hz
• Power Consumption: ≤15 VA
• Display: Backlit LCD (128×64 pixels), keypad interface
• Dimensions (W×H×D): 96 mm × 96 mm × 75 mm (panel-mount)
• Weight: 0.8 kg
• Operating Temperature: -20°C to +70°C (-4°F to 158°F)
• Storage Temperature: -40°C to +85°C (-40°F to 185°F)
• Certifications: CE, UL, CSA, IEC 61000-6-2 (industrial EMC)

Key Features

1. Comprehensive Power Quality Measurement
   • Real-time monitoring of 50+ electrical parameters, including total and individual harmonic distortion (THD), voltage unbalance, and flicker.
   • High-resolution waveform capture and harmonic spectrum analysis for precise disturbance diagnosis.
2. Intelligent Event Recording & Analysis
   • Built-in Voltage Disturbance Recorder (VDR) captures voltage sags, swells, transients, and interruptions, with time-stamped event logs for root-cause analysis.
   • Trend analysis and statistical reporting enable long-term power quality performance tracking.
3. Flexible Alarm & Control
   • Programmable thresholds for 20+ alarm conditions (over/under voltage/current, harmonic overload, unbalance) with configurable relay outputs.
   • Supports demand-based load shedding and capacitor bank control for power factor correction.
4. Robust Communication & System Integration
   • Multi-protocol support (Modbus RTU/TCP, DNP 3.0) enables seamless connectivity with SCADA, DCS, and BMS systems.
   • Isolated communication ports ensure noise immunity in harsh industrial environments.
5. User-Friendly Operation & Industrial Reliability
   • Intuitive LCD/keypad interface for on-site configuration, data viewing, and diagnostics.
   • Compact panel-mount design, wide operating temperature range, and ruggedized components ensure long-term reliability in industrial and utility applications.

Application Scenarios

• Power Utilities
  • Substation monitoring, distribution grid power quality analysis, and compliance with IEC 61000-3 standards.
  • Renewable energy (solar/wind) grid integration, monitoring harmonic distortion and voltage fluctuations.
• Industrial Facilities
  • Manufacturing plants (automotive, electronics, food & beverage) protecting sensitive equipment from harmonic damage and voltage disturbances.
  • Oil & gas refineries, chemical plants, and mining operations ensuring reliable power for motors, drives, and critical processes.
• Commercial & Large Buildings
  • Data centers, hospitals, and shopping malls monitoring power quality to prevent equipment downtime and ensure safety.
  • HVAC and lighting system optimization, reducing energy consumption and improving power factor.
• Critical Infrastructure
  • Airports, railways, and telecommunications facilities maintaining stable power for control systems and emergency services.
  • Research laboratories and pharmaceutical plants requiring precise power quality for sensitive instrumentation.