Description
The GE Multilin PQM-T20-C-A is a high-performance, three-phase power quality meter designed for monitoring and metering utility and industrial power systems. It provides comprehensive measurements of voltage, current, and power, while also offering advanced power quality analysis tools such as harmonic distortion and waveform capture.
Product Parameters (Datasheet)
- Model Number: PQM-T20-C-A
- Power Supply: 90–300V AC or 70–300V DC (Standard Universal Supply)
- Current Inputs: 5A Secondary (Standard CT interface)
- Voltage Inputs: Up to 600V AC direct (higher with PTs)
- Frequency: 50/60 Hz
- Communications: * “C” Option: RS485 Modbus RTU / DNP 3.0
- Auxiliary I/O: * “T” Option: Transducer Analog Outputs (3 or 4 channels)
- “A” Option: Additional Alarm/Control Relays
- Accuracy: 0.2% for voltage and current; 0.4% for power/energy
- Mounting: 4-inch Round ANSI or Square cutout
GE PQM-T20-C-A
GE PQM-T20-C-A
GE PQM-T20-C-A
Country of Origin
This metering equipment is manufactured by GE Multilin in Canada, a global leader in power system protection and monitoring.
Application Fields
The PQM-T20-C-A is widely used for power management and diagnostic purposes:
- Industrial Facilities: Monitoring the power consumption and quality of large motors and production lines.
- Utility Substations: Acting as a high-accuracy revenue-grade meter and feeder monitor.
- Commercial Buildings: Load profiling and cost allocation for different departments or tenants.
- Data Centers: Ensuring power stability and monitoring harmonic interference that could affect sensitive servers.
Product Usage Instructions
- Mounting: Install the meter in a standard 4-inch round opening or use the square bezel adapter for panel mounting. Ensure the mounting brackets are tightened to withstand vibration.
- Wiring CTs and PTs: Connect the Current Transformers (CT) and Potential Transformers (PT) to the designated rear terminals. Caution: Never open-circuit a CT secondary while the primary is energized.
- Communication Setup: Set the Modbus slave address and baud rate through the front-panel keypad. This allows the meter to transmit data to a SCADA or Power Monitoring system.
- Threshold Configuration: Define the alarm setpoints for over-voltage, under-voltage, and harmonic limits. The integrated “A” option relays can be programmed to trip or signal an external alarm.
- Data Retrieval: Use the front-panel display to scroll through real-time values, or use GE EnerVista software via the RS485 port for detailed waveform analysis and trend logging.
Product Technical Description
The PQM-T20-C-A is more than a simple voltmeter; it is a digital signal processor (DSP) based analyzer. Technically, it samples the voltage and current waveforms at high speeds to calculate True RMS values, preventing errors caused by non-linear loads. The “T20” designation typically refers to the specific combination of analog outputs and input scales. Its ability to calculate Total Harmonic Distortion (THD) up to the 31st harmonic makes it an essential tool for troubleshooting modern electrical systems containing variable frequency drives (VFDs) and UPS systems.
Q&A (Common Questions)
Q: Can I use this meter on a 1A CT secondary? A: This specific model is designed for 5A. For a 1A system, a different model variant (PQM-B20-…) or an interposing CT is required.
Q: What is the “Waveform Capture” feature? A: It allows the meter to take a “snapshot” of the electrical wave during a fault or disturbance, which can then be analyzed on a PC to determine the cause of the power issue.
Q: Does it support Ethernet? A: The standard “C” option is RS485. For Ethernet connectivity, an external GE Multilin EPM or a serial-to-ethernet gateway is typically used.
Q: How do I reset the energy (kWh) counter? A: This can be done via the front-panel menu under “Maintenance” (password protected) or via a Modbus command.
Similar Model Recommendations
- GE PQM-B20-C-A (Basic version without transducer outputs)
- GE EPM 6000 (Modern successor with high-speed sampling)
- GE EPM 7000 (Advanced power quality meter with integrated Ethernet)
- GE PQM-II (The next generation in the PQM series)
- GE 369 series (Related motor management relay with metering features)
For technical support or to procure the GE PQM-T20-C-A, please contact our power monitoring technical team.
