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HF-PQ-203 8-channel power quality monitor
This 8-channel power quality monitor serves as an 8-loop online monitoring unit. Adopting IEC Class A accuracy, it continuously measures voltage, current, harmonics, interharmonics, flicker and three-phase unbalance round the clock for power distribution grids and renewable energy stations.
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Defined by China National Standard GB/T 32507—2024, power quality stands for the overall electrical properties at specified grid nodes, indicating how much AC power supplied by public grids deviates from ideal benchmarks in voltage, current, frequency and waveform. It determines the stability, safety and energy efficiency of all electrical equipment.
Ideal mains power has fixed frequency, pure sine waves and steady rated voltage. Balanced three-phase electricity features identical phase amplitudes with 120° phase separation, without fluctuation, distortion or unbalance. A key evaluation indicator for grids, power quality covers power generation through end consumption and underpins secure, efficient and economical grid operation.
With massive integration of wind and solar power and extensive application of nonlinear impulse loads including inverters, EV chargers, precision industrial devices and data centers, power quality problems keep worsening. Rising demands from advanced manufacturing and daily electricity usage also make power quality critical to production efficiency, equipment lifespan, power safety and reliable grid operation.
Main Functions of Monitoring Device
Basic Monitoring Parameters
Grid frequency, RMS values of three-phase fundamental voltage and current; fundamental active power, reactive power, power factor and phase;
Voltage deviation, frequency deviation, three-phase voltage unbalance factor, three-phase current unbalance factor, negative-sequence voltage and current;
Harmonics (2nd to 65th orders): total harmonic distortion (THD) of voltage & current, harmonic ratio, amplitude and phase of each harmonic order.
Voltage deviation, frequency deviation, three-phase voltage unbalance factor, three-phase current unbalance factor, negative-sequence voltage and current;
Harmonics (2nd to 65th orders): total harmonic distortion (THD) of voltage & current, harmonic ratio, amplitude and phase of each harmonic order.
Advanced Monitoring Parameters
Interharmonics, voltage fluctuation and flicker; voltage swell, voltage dip, short interruption and temporary overvoltage.
Display Function
Equipped with a large-color LCD screen on the front panel to display real-time power quality measurement data.
Parameter Setting Function
Users can view, configure and modify basic device parameters and threshold limits, with password protection enabled.
Data Recording & Storage Function
Built-in TF card supports real-time storage of both basic and advanced measurement data. Local data can be retained for up to 1 year and updated on a first-in first-out (FIFO) basis afterwards.
Statistical Function
Online statistics for core measurement values are available, which can calculate 3-second average readings within every minute.
Communication Function
Multiple communication ports are configured for real-time data transmission or scheduled data retrieval. It connects to the remote power quality management center via industrial Ethernet; remote access is also achievable through RS232C/RS485 ports with customized GPRS module.
Time Synchronization Function
Supports network time synchronization to align clock time with the remote management system. IRIG-B time synchronization is also integrated to guarantee precise device clock.
Event-triggered Recording Function
Once measured values exceed preset thresholds, the device automatically records event logs permanently for later retrieval and inquiry.
Technical Accuracy Specifications
- Voltage maximum permissible error: ±0.1%
- Current maximum permissible error: ±0.1%
- Frequency maximum permissible error: ±0.01
- HzFrequency measurement range: 42.5Hz ~ 57.5Hz
- Three-phase voltage negative sequence unbalance maximum permissible error: ±0.15%
- Three-phase current unbalance maximum permissible error: ±1%
- Flicker maximum permissible error: ±5%
- Voltage fluctuation maximum permissible error: ±5%
- Harmonic measurement accuracy grade: Class
- AInterharmonic measurement accuracy grade: Class A
| Grade | Measured Parameter | Condition | Maximum Permissible Error | Phase Angle Error |
|---|---|---|---|---|
| A | Voltage | Uₕ ≥ 1%Uₙ | 5%Uₕ | ≤ ±5° |
| A | Voltage | Uₕ ＜ 1%Uₙ | 0.05%Uₙ | or h×±1° |
| A | Current | Iₕ ≥ 3%Iₙ | 5%Iₕ | ≤ ±5° |
| A | Current | Iₕ ＜ 3%Iₙ | 0.15%Iₙ | or h×±1° |
FAQ for 8-Channel Power Quality Monitor
Q1: What is an 8-channel power quality monitor used for?
A: This 8-channel power quality monitor is designed for 24/7 online grid monitoring. It simultaneously collects power quality data from 8 independent feeders, measuring harmonics, flicker, voltage unbalance and frequency for distribution substations and renewable power plants.
Q2: What accuracy class does this 8-channel power quality monitor adopt?
A: Our 8-channel power quality monitor complies with IEC 61000-4-30 Class A standard. It delivers high precision for harmonic, interharmonic and flicker measurement to meet grid acceptance requirements.
Q3: How many circuits can one 8-channel power quality monitor test at the same time?
A: Equipped with 8 synchronous sampling channels, a single unit can monitor up to 8 three-phase power loops concurrently, greatly cutting equipment investment and installation costs.
Q4: Which power quality parameters can this device record?
A: It monitors voltage, current, frequency, voltage fluctuation, flicker, 3-phase unbalance, harmonics, interharmonics, voltage sags and swells, covering all mandatory power quality indicators.
Q5: Can the 8-channel power quality monitor upload data remotely?
A: Yes. It supports Ethernet and 4G communication modes. All recorded power quality data can be transmitted remotely to the cloud management platform for centralized viewing and analysis.
Q6: What application scenarios fit this 8-channel power quality monitor?
A: It is widely applied in urban substations, photovoltaic & wind farms, industrial plants, data centers and commercial buildings for grid-connected compliance inspection and harmonic governance.
Q7: What is the frequency measurement range of this power quality monitor?
A: Its frequency measuring range is 42.5Hz~57.5Hz with a maximum allowable error of ±0.01Hz, adapting to most global power grid frequency conditions.
Q8: Is this wall-mounted power quality monitor easy to install?
A: Absolutely. It features a standard cabinet-mounted structure, which can be conveniently installed inside RMU cabinets, distribution boxes and secondary equipment rooms.
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