GE PQMII-T20-C-A Power Quality Meter

The GE PQMII-T20-C-A is a high-precision, multi-functional power quality analysis device under GE's industrial power monitoring product line. Its core positioning is "comprehensive power quality parameter monitoring, transient event capture, and data traceability analysis for both power grid and user sides". Widely applied in industrial plants, commercial buildings, data centers, and power distribution networks, it provides users with an all-in-one solution ranging from basic electrical parameter measurement to complex harmonic analysis. It helps identify equipment failures caused by power quality issues (such as harmonic pollution and voltage sags) while optimizing energy efficiency and power supply reliability.

• PQMII: Product series identifier, representing "Power Quality Monitor II (2nd-Generation Power Quality Monitor)". Compared with the first-generation PQM series, it features optimized sampling rate, storage capacity, and communication compatibility.

• T20: Function level and measurement channel configuration. The "T" stands for "Industrial-Grade Comprehensive Parameter Monitoring Type", and "20" indicates support for two wiring modes (3-phase 4-wire / 3-phase 3-wire) and high-precision measurement for loads up to 20kVA.

• C: Hardware configuration code. The "C" represents "Enhanced Data Processing Unit", equipped with a high-performance ARM processor (800MHz clock speed) to support higher-frequency harmonic analysis and faster event capture.

• A: Application adaptation identifier. The "A" denotes "General Industrial / Commercial Scene Adaptation", compatible with wide voltage input (100-480V AC), distinguishing it from Type "B" (dedicated for high-voltage distribution networks) and Type "D" (customized for data centers).

• Event Trigger Types: Supports voltage sags (U <80% of rated value), voltage swells (U > 120% of rated value), voltage interruptions (U <10% of rated value), current surges (I > 120% of rated value), and frequency deviations (f <47Hz or f > 53Hz).

• Capture Speed: Sampling rate of 256 points per cycle (12.8kHz at 50Hz, 15.36kHz at 60Hz), with an event trigger response time ≤ 1ms. It can fully record waveform data for 1 cycle before and 4 cycles after an event occurs.

• Logging Capacity: Can store up to 1000 event records. Each record includes event type, occurrence time (accurate to milliseconds), trigger threshold, and waveform data (exportable in CSV format).

• Waveform Display: Supports on-device or software-based viewing of voltage/current waveforms (e.g., voltage drop curves during sags) with 16-bit waveform resolution, facilitating analysis of event severity.

• Operating Environment:

• Temperature: -40℃ to +70℃ (wide-temperature design, suitable for outdoor cabinets in cold regions and high-temperature industrial workshops).

• Humidity: 5% to 95% RH (non-condensing, supporting high-humidity coastal environments; PCB boards feature moisture-proof coating).

• Vibration: 0.006" amplitude at 5-15Hz, 0.5g acceleration at 15-50Hz, 1g acceleration at 50-100Hz (compliant with IEC 60068-2-6).

• Electromagnetic Compatibility (EMC): Resistant to radio frequency interference (10V/m, 80MHz-1GHz) and electrostatic discharge (4kV contact discharge, 8kV air discharge), complying with the IEC 61000-6-2 industrial standard.

• Electrical Safety:

• Insulation Resistance: ≥100MΩ (tested with 500V DC).

• Dielectric Loss Test: ≤2% (tested with 2kV AC at 50Hz for 1 minute).

• Overload Capacity: Voltage input supports 1.2x rated value for continuous operation; current input supports 10x rated value (no damage within 1 second).

• Protection Rating: IP65 for the panel (dustproof and spray-proof); IP20 for internal circuits (must be installed in enclosed distribution cabinets).

• Hardware Interfaces:

• 1 RS-485 interface (half-duplex, baud rate 9600-115200bps, supporting Modbus RTU protocol) for connecting to PLCs, SCADA systems, or local data loggers.

• 1 RS-232 interface (full-duplex, baud rate 9600-115200bps) for connecting to laptops for on-site configuration and data export.

• 1 optional Ethernet interface (10/100Mbps auto-negotiation, supporting Modbus TCP/IP and Bacnet IP protocols) for large-scale network monitoring scenarios.

• 1 USB Type A interface (Version 2.0) for exporting historical data to U disks (in CSV/Excel format), supporting U disks up to 32GB.

• Data Transmission Content: Can remotely transmit real-time measurements, historical data (hourly/daily/monthly statistics), event records, and harmonic data. The transmission cycle is configurable (1s-3600s).

• Time Synchronization: Supports NTP network time synchronization (for Ethernet-enabled models) or manual time calibration, ensuring consistent timestamps across multiple devices (error ≤1s/day).

• Harmonic Pollution Analysis: Measures the 1st to 50th harmonic content of voltage/current, calculates total harmonic distortion (THD), odd harmonic distortion (THD odd), and even harmonic distortion (THD even). It intuitively displays the proportion of each harmonic (e.g., 5% for the 3rd harmonic, 3% for the 5th harmonic) via bar charts on the display or software, helping locate harmonic sources (e.g., nonlinear loads like inverters and UPS systems).

• Voltage Fluctuation & Flicker Monitoring: Compliant with the IEC 61000-4-15 standard, it measures short-term flicker (Pst) and long-term flicker (Plt) with a resolution of 0.01. It identifies voltage fluctuations caused by frequent motor starts or arc furnace operations, preventing light flicker or crashes of sensitive equipment (e.g., servers).

• Three-Phase Unbalance Analysis: Calculates three-phase voltage unbalance (negative sequence voltage component / positive sequence voltage component ×100%) and three-phase current unbalance with an accuracy of ±0.1%. It monitors three-phase imbalances caused by excessive single-phase loads (e.g., air conditioners and lighting in commercial buildings), preventing transformer overheating and reduced motor efficiency.

• Transient Event Traceability: As mentioned earlier, it captures voltage sags/swells/interruptions and records event waveforms and parameters. For example: "2024-05-20 14:30:05, Phase A voltage sag from 220V to 160V, duration 0.5s"—helping users determine if the event is caused by grid faults, lightning strikes, or local load switching.

• Storage Cycle & Capacity:

• Real-Time Data: Samples at 1s intervals, with on-device storage of 1 year’s hourly statistical data (active power, reactive power, energy, etc.).

• Historical Data: Generates hourly/daily/monthly statistical reports (e.g., daily energy consumption, average power factor, maximum current). Data is retained for 72 hours by a supercapacitor after power failure to prevent data loss.

• Event Data: Stores 1000 event records (each with complete waveforms). When storage is full, it automatically overwrites the oldest records (configurable to "no overwrite" mode, triggering an alarm when full).

• Trend Analysis Tools: Via the supporting GE PowerView software (compatible with Windows systems), it generates trend curves for parameters like voltage, current, power, and THD (e.g., 7-day power variation curves). It supports year-on-year/period-on-period analysis (e.g., monthly vs. previous month’s energy consumption comparison) to identify energy waste (e.g., no-load operation of equipment at night).

• Alarm Configuration:

• Allows setting upper/lower limits for over 20 parameters (e.g., voltage upper limit 242V, lower limit 198V; current upper limit 4.5A; THD upper limit 8%).

• Alarm Methods: Red blinking on the local LCD + buzzer alarm (mutable), relay output alarm (2 normally open/normally closed alarm relays, 2A/250V AC capacity), and remote communication alarm (sending alarm codes to SCADA systems via Modbus).

• Alarm Logging: Automatically stores alarm events (including occurrence time, parameter values, and alarm type), exportable as reports for fault traceability.

• Linked Control:

• Equipped with 4 programmable relay outputs (SPDT type, 2A/250V AC capacity), which can trigger control actions linked to specific events. Examples include:

1. When voltage sags <180V, trigger a relay to cut off power to sensitive equipment (e.g., servers) to avoid restarting.

2. When power factor <0.85, trigger a relay to switch on reactive power compensation capacitors, increasing the power factor to above 0.95 and reducing grid penalties.

3. When current > 4.8A, trigger a relay to cut off non-critical loads (e.g., lighting) to avoid overload tripping.

• Programming-Free Quick Configuration: Via panel buttons or PowerView software, users can configure wiring modes (3-phase 4-wire / 3-wire), CT/PT ratios (e.g., 500/5A), alarm thresholds, and communication parameters—no coding required, with Chinese prompts throughout the configuration wizard.

• Self-Inspection & Fault Diagnosis: The device performs regular hardware self-tests (e.g., ADC calibration, relay testing, communication interface detection). If faults are detected (e.g., CT open circuit, communication interruption), it automatically displays fault codes on the LCD (e.g., "E03-CT Open Circuit") and provides troubleshooting suggestions (e.g., "Check CT wiring").

• Firmware Upgrade: Supports firmware upgrades via USB or Ethernet interfaces (latest firmware available for download on GE’s official website), no device disassembly required—ensuring continuous function optimization (e.g., firmware versions adding harmonic analysis up to the 63rd harmonic).

• Wiring Fault Tolerance: Voltage input supports "phase sequence error" detection (LCD prompts "Phase Sequence Error"); current input supports "CT polarity reversal" compensation (configurable as "reverse" in software, no re-wiring needed)—reducing rework caused by on-site wiring errors.

• Core Needs: Monitor power quality of production line equipment (e.g., inverters, machine tools) to prevent equipment shutdowns caused by harmonics or voltage sags; calculate energy consumption of each production line for cost allocation.

• PQMII-T20-C-A Application:

• Installed in workshop distribution cabinets to monitor 3-phase voltage/current, THD (focusing on 5th/7th harmonics generated by inverters), and voltage sag events.

• Configured with "THD > 10% alarm + inverter power cutoff" to prevent motor damage from harmonics.

• Uses PowerView software to generate daily energy consumption reports for each production line, identifying "Production Line B’s no-load operation at night (wasting 500kWh/month)"—optimization saves ~CNY 3,000 in monthly electricity costs.