GE PQM-T20-A Power Quality Meter

• • Voltage measurement (supports three-phase four-wire/three-wire systems)
  • Current measurement (via external CTs, standard inputs of 1 A or 5 A)
  • Frequency range: 45 Hz to 65 Hz
  • Power parameters: Active power (kW), reactive power (kvar), apparent power (kVA), power factor (PF), phase angle
  • Energy measurement: Forward/reverse active energy (kWh), reactive energy (kvarh)
• Power Quality Analysis:
  • Harmonic analysis (up to 50th harmonic, compliant with IEC 61000-4-7)
  • Total Harmonic Distortion (THD) calculation for voltage and current
  • Voltage sag/swell detection (records event timing, duration, and magnitude)
  • Flicker measurement (compliant with IEC 61000-4-15, measuring short-term flicker (Pst) and long-term flicker (Plt))
  • Three-phase imbalance calculation for voltage and current
• Event Recording and Alarms:
  • Built-in event triggering mechanism to record voltage interruptions, transients, harmonic limit violations, etc.
  • Supports user-defined alarm thresholds (e.g., voltage deviation, excessive harmonic content)
• Communication Interface:
  • Standard communication: RS-485 (Modbus RTU protocol)
  • Optional communication modules: Ethernet (Modbus TCP), Profibus, BACnet (depending on specific configuration)
  • Supports remote data reading and parameter setting
• Display and Installation:
  • No local display (PQM-T20 series is a DIN rail-mounted display-less meter; data must be viewed via software or upper-level systems)
  • Installation method: DIN rail mounting (35 mm standard rail)
  • Protection class: IP20 (for indoor installation only)
• Power Supply:
  • Auxiliary power supply: Universal AC/DC 85–265 V (wide voltage supply)
• Standards Compliance:
  • IEC 61000-4-30 Class S (power quality measurement accuracy class)
  • IEC 62053-22 (electricity metering accuracy)
  • EN 50160 (supply voltage characteristics)

Functional Characteristics:

• High-Precision Measurement: Provides accurate measurement of voltage, current, power, energy, and power factor, meeting the requirements for billing and energy efficiency audits.
• Comprehensive Power Quality Analysis: Captures flicker, voltage sags/swells, transients, and harmonic distortion to locate the root causes of sensitive load failures.
• Event and Data Recording: Records fault waveforms, limit violations, and pulse counts, supporting SCADA/PLC tracing and report generation.
• Control Linkage: Enables load switching, reactive power compensation, and interlock protection through analog/relay outputs.

Application Scenarios:

• Industrial Power Distribution Systems: Monitoring power quality in factory power distribution systems.
• Data Center Power Protection: Analyzing power quality to ensure reliable power supply in data centers.
• Renewable Energy Grid Connection: Evaluating power quality for grid-connected renewable energy sources such as wind and solar power.
• Motor Control Centers (MCCs) and Switchgear: Integrated power monitoring in motor control centers and switchgear.
• Critical Load Monitoring: Monitoring power quality for critical loads in petrochemical, oil and gas platforms, and other industries.