GE PQM II-T20-A Multilin Power Quality Meter

Description

Technical Specifications

• Manufacturer: GE Vernova (General Electric Multilin)
• Model: PQM-T20-A (also referenced as PQMII-T20-A)
• Series: PQM II (Second-Generation Power Quality Meters)
• System Compatibility: Three-phase, three-wire/four-wire (120–600 VAC line-line)
• Voltage Measurement Range: 0–600 VAC (phase-phase / phase-neutral)
• Current Measurement Range: 0–20 AAC (via external CTs)
• Measurement Accuracy: ±0.2% (voltage/current/power); ±0.5% (energy)
• Frequency: 50 / 60 Hz (auto-detect)
• Harmonic Analysis: Up to 63rd harmonic; calculates THD (Total Harmonic Distortion) and TIF (Telephone Influence Factor)
• Voltage Disturbance Recorder (VDR): Captures up to 500 sag/swell events; monitors dips, spikes, and interruptions
• Data Logging Capacity: 98,000 historical data records; 150 event logs; 500 VDR events
• Inputs:
  • 4 programmable digital inputs (status monitoring: breakers, switches)
  • 1 pulse input (kWh pulsing)
• Outputs:
  • 4 isolated analog outputs (0–20 mA / 4–20 mA, configurable)
  • 4 programmable digital outputs (relays: alarms, control)
  • 1 fixed relay output (fail-safe)
• Communication Ports:
  • RS485 (Modbus RTU, DNP 3.0)
  • RS232 (local configuration)
• Power Supply: 70–265 VAC / 100–300 VDC, 50/60 Hz, 15 VA
• Operating Temperature: -20°C to +85°C
• Storage Temperature: -30°C to +90°C
• Dimensions (W × H × D): 225 mm × 165 mm × 85 mm
• Weight: 2.5 kg (5.5 lbs)
• Mounting: Panel-mount (standard DIN cutout)
• Certifications: CE, IEC 61000-6-2, IEC 61000-6-4, UL 508
• Status: Discontinued (end-of-life, EOL); available via surplus/retrofit channels

Key Features

1. Comprehensive Power Quality Monitoring: Measures voltage, current, real/reactive/apparent power, power factor, frequency, energy (kWh/kVARh), and demand; detects unbalance, harmonics, sags, swells, and transients.
2. High-Resolution Harmonic Analysis: Analyzes harmonics up to the 63rd order with THD/TIF calculation; identifies distortion from VFDs, rectifiers, and non-linear loads.
3. Voltage Disturbance Recorder (VDR): Captures 500 sag/swell events with waveform snapshots; records event time, duration, and magnitude for root-cause analysis.
4. Large-Capacity Data Logging: Stores 98,000 historical records and 150 event logs; supports trend analysis, compliance reporting, and forensic investigation.
5. Programmable I/O & Control: 4 digital inputs, 4 digital outputs, and 4 analog outputs enable alarm annunciation, load shedding, power factor correction, and breaker control.
6. Dual Communication Protocols: RS485 port supports Modbus RTU and DNP 3.0 for seamless integration with SCADA, DCS, and EMS systems.
7. User-Friendly Interface: Large, backlit LCD display with keypad for local configuration, real-time data viewing, and waveform display.
8. Industrial-Grade Reliability: Wide operating temperature (-20°C to +85°C), heavy-duty metal enclosure, and high noise immunity ensure performance in harsh environments.
9. Flash-Upgradable Firmware: Supports field upgrades for new features and protocol enhancements, extending service life.
10. Multi-Tariff Energy Calculation: Programmable energy tariffs enable cost allocation and demand charge management for commercial/industrial facilities.

Applications

• Industrial Facilities: Monitors power quality in manufacturing plants, refineries, and processing facilities; protects motors, VFDs, and sensitive equipment from harmonic damage and voltage disturbances.
• Data Centers & Critical Infrastructure: Ensures clean, stable power for servers, UPS systems, and IT equipment; prevents downtime from sags, swells, and harmonics.
• Commercial Buildings: Optimizes energy usage in office towers, malls, and hospitals; verifies utility power quality compliance and allocates energy costs.
• Utilities & Substations: Monitors distribution feeders, transformers, and switchgear; collects data for grid performance analysis and customer power quality disputes.
• Renewable Energy Systems: Analyzes power quality at wind/solar inverter interconnections; detects harmonics and voltage fluctuations from variable generation sources.
• Retrofit Projects: Replaces legacy PQM/MPM/MTM meters in existing systems; maintains compatibility with older SCADA/EMS infrastructure.

System Compatibility

• Compatible Software: GE Multilin EnerVista (configuration, data logging, reporting); GE MultiNet (serial-to-Ethernet gateway for remote access).
• Communication Protocols: Modbus RTU (RS485), DNP 3.0 (RS485); supports custom Modbus memory mapping.
• Integration: Works with GE Multilin relays, PLCs, and third-party SCADA/DCS systems via standard protocols.