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HF-PQ-202 Dual Channel Power Quality Monitor
This dual channel power quality monitor enables synchronous monitoring of two independent electrical circuits. It accurately records voltage fluctuations, harmonic distortion, power parameters and grid faults, widely applied in substations, industrial power distribution and energy efficiency auditing.
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Growing power loads driven by economic expansion, alongside nonlinear impulse loads such as converters, electrified railways and arc furnaces, lead to severe grid power quality degradation including harmonic distortion, voltage flicker and three-phase unbalance.
Such problems trigger transformer overheating, higher grid losses, metering inaccuracies and communication interference, endangering safe and economical grid operation. Global power quality standards have been enacted, and China has issued five national specifications plus management rules:
- GB/T 14549-93: Harmonics in Public Grids
- GB/T 12326-2000: Voltage Fluctuation and Flicker
- GB/T 15543-95: Permissible Three-Phase Voltage Unbalance
- GB/T 12325-90: Allowable Supply Voltage Deviation
- GB/T 15945-95: Allowable Power System Frequency Deviation
Based on in-depth research and advanced international technologies, we have developed a new-generation power quality monitor.
Adopting DSP+ARM+CPLD triple-core architecture and a 3.8-inch 320×240 LCD display, this compact, high-performance multifunctional analyzer serves 35kV~220kV substations, power plants and large industrial consumers.
Main Applications
Monitor grid power quality parameters including frequency deviation, voltage deviation, voltage flicker, three-phase unbalance and harmonics.Conduct harmonic analysis on non-stationary time-varying signals using wavelet transform.
Evaluate influences of all types of electrical loads on grid power quality under various operating modes.
Track load variations by regularly recording and storing trending curves of voltage, current, active/reactive power, frequency and phase.
Carry out dynamic monitoring during power equipment adjustment and commissioning to tackle onsite operational issues.
Diagnose root causes of power system faults: circuit breaker actions, transformer overheating, motor burnout and automation device malfunctions.
Test dynamic performance of reactive compensation and harmonic filtering equipment, and deliver quantitative evaluation of their technical specifications.
Equipped with online multi-parameter measurement, large storage capacity and high accuracy supported by modern signal analysis theories, the unit is extensively adopted in power transmission & distribution, power electronics and motor drive sectors.
Evaluate influences of all types of electrical loads on grid power quality under various operating modes.
Track load variations by regularly recording and storing trending curves of voltage, current, active/reactive power, frequency and phase.
Carry out dynamic monitoring during power equipment adjustment and commissioning to tackle onsite operational issues.
Diagnose root causes of power system faults: circuit breaker actions, transformer overheating, motor burnout and automation device malfunctions.
Test dynamic performance of reactive compensation and harmonic filtering equipment, and deliver quantitative evaluation of their technical specifications.
Equipped with online multi-parameter measurement, large storage capacity and high accuracy supported by modern signal analysis theories, the unit is extensively adopted in power transmission & distribution, power electronics and motor drive sectors.
Technical Specifications
| Technical Item | Specification | Max. Allowable Error |
|---|---|---|
| Frequency Measurement | Measuring range: 45–55 Hz (nominal 50 Hz); Test condition: Fundamental component ≥80% F.S. | ≤0.02 Hz |
| Input Voltage Range | AC 10–120 V / AC 10–400 V (optional) | — |
| Input Current Range | 5 A / 1 A (optional) | — |
| Fundamental Voltage Amplitude Measurement | — | ≤0.5% F.S. |
| Fundamental Current Amplitude Measurement | — | ≤1% F.S. |
| Phase Difference Measurement (Fundamental Voltage & Current) | — | ≤0.5° |
| Harmonic Voltage Ratio Measurement | — | ≤0.1% |
| Harmonic Current Ratio Measurement | — | ≤0.2% |
| Three-Phase Voltage Unbalance Measurement | — | ≤0.2% |
| Three-Phase Current Unbalance Measurement | — | ≤1% |
| Voltage Deviation Measurement | — | ≤0.2% |
| Voltage Fluctuation Measurement | — | ≤0.2% |
| Power Measurement | — | ≤0.5% |
| Flicker Measurement | — | ≤5% |
Cutout Dimension Drawing & Overall Outline Dimension Drawing
Dual Channel Power Quality Monitor – FAQ
Q1: What is a dual channel power quality monitor?
A: It is a high-precision power quality analyzer that supports two independent circuit synchronous monitoring. It captures grid parameters, harmonics, fluctuation and unbalance for power system analysis and troubleshooting.
Q2: What parameters can this device measure?
A: It monitors frequency, voltage deviation, current, power, phase, voltage flicker, three-phase unbalance and harmonic distortion, covering full standard power quality indicators.
Q3: What is the measurement accuracy?
A: Voltage & current amplitude error ≤0.5%~1% FS, phase error ≤0.5°, harmonic error ≤0.2%, flicker error ≤5%, meeting national and international grid standards.
Q4: What voltage and current ranges are supported?
A: Input voltage: AC 10~120V or 10~400V optional; Input current: 1A / 5A selectable, adaptable for most distribution systems.
Q5: Does it support harmonic analysis for non-stationary signals?
A: Yes. It adopts wavelet transform algorithm to analyze time-varying and non-stationary harmonic signals for complex industrial load conditions.
Q6: What scenarios is this device suitable for?
A: Widely used in 35kV/110kV/220kV substations, power plants, industrial power distribution, reactive compensation equipment testing and energy quality auditing.
Q7: Can it record load trend data?
A: Yes. It continuously records and stores voltage, current, power, frequency and phase trend data for load fluctuation analysis.
Q8: What hardware architecture does it adopt?
A: It adopts DSP+ARM+CPLD triple-core architecture, with 3.8-inch LCD display, ensuring fast response, stable operation and high measuring precision.
Q9: Can it diagnose power system faults?
A: It supports analyzing faults such as transformer overheating, motor burnout, breaker misoperation and automatic device abnormal actions.
Q10: Is it applicable for long-term online monitoring?
A: Yes. Featuring multi-parameter, high-precision, large-capacity storage and online continuous sampling, it supports long-term unattended grid monitoring.
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