With the widespread application of industrial automation and power electronic devices, power quality issues such as harmonic pollution, three-phase imbalance, and voltage fluctuations in power grids have become increasingly prominent. These problems not only impair the normal operation of electrical equipment but can also lead to equipment damage and production disruptions under severe conditions, resulting in significant economic losses. Accurate detection and analysis of power quality parameters are fundamental prerequisites for identifying power faults and optimizing power supply quality.
We introduce this three-phase power quality analyzer, which features an ARM+DSP dual-core architecture and integrates 13 specialized detection functions covering voltage and current, harmonics, interharmonics, power quality parameters, three-phase imbalance, flicker, voltage surge and drop interruptions, surge currents, transients, harmonic power, power waves, long-term monitoring and recording, as well as digital oscilloscope capabilities. With its portable design, 5.7-inch color touchscreen interface, bilingual (Chinese/English) operation, and compatibility with professional PC-based data analysis software, the instrument provides a comprehensive solution for power quality monitoring and analysis in power systems, industrial enterprises, and renewable energy plants.
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Dual-core ARM+DSP architecture with comprehensive coverage of 13 functions across all dimensions
This instrument features a dual-core ARM+DSP processor architecture paired with 16 MB of high-capacity memory, enabling high-speed data acquisition and real-time parallel processing. It integrates 13 specialized detection functions, ranging from basic measurements of voltage, current, and frequency to advanced capabilities such as harmonic analysis, interharmonic detection, flicker assessment, voltage transient event capture, power metering, three-phase imbalance analysis, and long-term data monitoring and recording. A single unit can perform comprehensive power quality parameter testing without requiring multiple devices.
It supports both three-phase three-wire and three-phase four-wire connection modes, meeting testing requirements across various power grid architectures. For single-phase measurements, users can select the three-phase four-wire mode connected to Phase A channel, enabling flexible adaptation to diverse testing scenarios. With digital oscilloscope functionality featuring a maximum sampling rate of 200 kHz, it provides intuitive visualization of instantaneous voltage and current waveforms, facilitating analysis of waveform distortion characteristics.
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High-precision measurement with professional-grade data accuracy
The voltage measurement accuracy reaches 0.1% rdg ± 0.05% f·s, the current measurement accuracy is 0.2% rdg ± 0.05% f·s, and the frequency measurement accuracy is ±0.01 Hz, meeting professional-grade instrument standards. Harmonic measurement covers the full frequency range from 2 to 50 orders, with interharmonic measurements spanning 0.1–19.9 orders, fully complying with all national standards for power quality harmonic detection.
Three-phase imbalance measurement accuracy: ±0.2%; phase angle measurement accuracy: ±0.3°; capable of accurately calculating positive-sequence, negative-sequence, and zero-sequence components with intuitive vector diagram display. Voltage flicker measurement covers 1-minute flicker, 10-minute short-term flicker, and 2-hour long-term flicker, complying with IEC flicker measurement standards. Power measurement accuracy: ±0.5%; supports active power, reactive power, apparent power, and energy metering; measures demand over 1-,5-,10-,15-,30-, and 6-minute intervals.
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Accurate capture of transient events to identify the root causes of grid disturbances
The instrument features advanced transient event detection capabilities, automatically capturing and recording voltage surges, drops, and interruptions along with their half-wave RMS values, start/stop times, and durations—with a time accuracy of ±10 ms. It can store up to 40 events, enabling maintenance personnel to quickly identify the occurrence timing and severity of grid voltage disturbances.
The surge current detection function captures single-phase or multi-phase surge current events, recording both the amplitude and duration of impulse currents. The voltage transient detection capability identifies voltage transient pulses lasting over 20 microseconds with a capture probability of 98.7%, storing up to 20 transient events to provide data support for analyzing transient disturbances such as lightning strikes and switching operation overvoltages.
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Long-term monitoring records with comprehensive PC-based in-depth analysis
The instrument supports prolonged steady-state monitoring and recording of power quality parameters, with adjustable recording intervals ranging from 3 seconds to 30 minutes. At a 3-second interval, continuous monitoring can be performed for up to 16 hours; at a 30-minute interval, cumulative monitoring duration reaches up to 960 hours (40 days), meeting the long-term power quality assessment requirements for scenarios such as substations and industrial users.
Equipped with 128 MB of built-in FLASH storage and USB drive data export capability, the device comes with specialized PC-based power quality data analysis software that enables comprehensive processing of uploaded measurement data—including detailed trend analysis, report generation, and exceedance statistics—and automatically generates professional inspection reports to support power quality assessment and mitigation planning. The software supports USB drive upgrades for easy future functionality expansion and maintenance.
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Portable human-machine interaction design for convenient and efficient on-site operation
Equipped with a 5.7-inch 640×480 color LCD display supporting full touchscreen operation, featuring bilingual Chinese/English menus for intuitive and user-friendly operation. Its modular design ensures stable and reliable performance, making it suitable for complex industrial environments.
Equipped with a built-in rechargeable lithium battery that provides 5–6 hours of continuous operation on full charge, meeting the demands of round-the-clock field testing. Includes an AC 100–240 V wide-voltage power adapter compatible with global power supply standards. The entire system features an aluminum alloy instrument housing that integrates the main unit, current sensor, test cables, and accessories for convenient portability and on-site use.
| Parameter Item | measuring range | certainty of measurement |
|---|---|---|
| three-phase voltage | 1000 V (true effective value) | 0.1%rdg ±0.05%f.s |
| Neutral line voltage | 70 V (true effective value) | 0.1%rdg ±0.05%f.s |
| three-phase alternating current | 6000 A (true effective value; optional sensor) | 0.2%rdg ±0.05%f.s |
| Neutral line current | 25A (Actual effective value, optional sensor) | 0.2%rdg ±0.05%f.s |
| frequency | 40~70Hz | ±0.01Hz |
| Parameter Item | measuring range | certainty of measurement |
|---|---|---|
| Voltage Harmonics | Fundamental wave + 2nd to 50th harmonics, including THD | When Uh ≥ 1% of UN: ±5% of Uh; When Uh <1% of UN: ±0.05% of UN |
| current harmonics | Fundamental wave + 2nd to 50th harmonics, including THD | When Ih ≥ 3% of IN, the tolerance is ±5% of Ih; when Ih <3% of IN, the tolerance is ±0.15% of IN. |
| Inter-voltage harmonics | 0.1–19.9 times the fundamental harmonic | When Uih ≥ 1% of UN: 5% of Uih; when Uih <1% of UN: 0.05% of UN |
| Intercurrent harmonics | 0.1–19.9 times the fundamental harmonic | When Iih ≥ 3% IN, the value is 5% IN; when Iih <3% IN, the value is 0.15% IN. |
| harmonic power | Active/reactive power of the 1st to 30th harmonics | Reading ±0.5% |
| Parameter Item | measuring range | certainty of measurement |
|---|---|---|
| Active Power/Electric Energy | 700kW / 10000kWh | Reading ±0.5% |
| Apparent Power/Electric Energy | 700kVA / 10000kVAh | Reading ±0.5% |
| Reactive Power/Electric Energy | 700kVAR / 10000kVARh | Reading ±0.5% |
| power factor | 0.00~1.00 | ±0.005 |
| Demand Statistics | 1/5/10/15/30/60 minutes | — |
| Parameter Item | qualification |
|---|---|
| Three-phase imbalance degree | Voltage/current imbalance: ±0.2%; Phase angle: ±0.3° |
| voltage flicker | 1-minute flicker: ±5.5%; 10-minute short-term flicker: ±5%; 2-hour long-term flicker: ±5%. |
| Sudden voltage surge/surge drop/interruption | Time error ±10 ms; records up to 40 events |
| surge current | Time error ±10 ms; capture stops after one event |
| voltage transient | Measurable for durations exceeding 20 μs, with a capture probability of 98.7%, capable of storing up to 20 events. |
| Power Wave | Measuring the half-wave power values at 1, 3, and 5 minutes to record the trend changes |
| Monitoring Records | The interval can be adjusted from 3 seconds to 30 minutes, with a maximum monitoring duration of 960 hours. |
| digital oscilloscope | Maximum sampling rate: 200 kHz; Minimum: 100 Hz |
| project | specifications |
|---|---|
| processor | ARM + DSP dual-core |
| display screen | 5.7-inch 640×480 color graphics LCD with touchscreen |
| memory capacity | 128 Mbit FLASH (16 MB) |
| External Storage | USB interface, supports USB drives |
| Voltage input impedance | 1MΩ,20pF |
| signal frequency range | 40Hz~70Hz |
| working power supply | Rechargeable lithium battery with a duration of 5–6 hours |
| External Power Source | AC100–240V / DC16.8V–1A Power Adapter |
| language | Chinese/English Bilingual |
| mode of connection | Three-phase three-wire / Three-phase four-wire |
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Step 1: Preparation and Wiring Before Testing
Select the appropriate wiring mode based on the grid configuration (three-phase three-wire or three-phase four-wire). Connect the voltage test leads to the main unit's voltage terminals according to color code: yellow for Phase A, green for Phase B, red for Phase C, black for neutral, and blue for ground. The other end should be connected to the corresponding phase sequence of the circuit using a fish-clamp or test probe.
Connect the current sensor to the main unit's current interface, clamp the measured phase wire with the current clamp, and ensure the conductor passes vertically through the sensor's clamping hole with phase sequence alignment matching the voltage. After verifying correct wiring, power on the device; it will enter the main menu interface, displaying battery level in the upper right corner and system time in the lower right corner.
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Step 2: System Parameter Settings
Enter the system management interface and configure instrument parameters according to actual testing requirements: select the wiring configuration (three-phase three-wire or three-phase four-wire), set voltage-current ratios, choose the language (Chinese/English), and calibrate the system time. Before initiating prolonged monitoring, set the data recording interval (available from 3 seconds to 30 minutes) and total recording duration to ensure sufficient storage capacity for testing needs.
After connecting the USB drive, you can perform data management and software upgrades. Tap the USB drive icon in the top-left corner three times consecutively to capture and save the current screen image to the USB drive for on-site recording of test status.
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Step 3: Measurement of Basic Parameters
Select the voltage/current/frequency measurement function. The instrument displays in real time the RMS values, peak values, and crest-to-peak ratios of three-phase voltage, neutral line voltage, three-phase current, neutral line current, and frequency, along with waveform and trend plots. It enables rapid assessment of fundamental power quality parameters such as grid voltage deviations, current overload, and frequency compliance.
Select the Power/Energy Measurement function to view active power, reactive power, apparent power, and power factor in real time, along with cumulative energy consumption data. It supports demand statistics for 1-,5-,10-,15-,30-, or 6-minute intervals, enabling evaluation of load characteristics and energy efficiency.
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Step 4: Specialized Power Quality Testing
Select the appropriate specialized function based on your testing requirements: Harmonic measurement displays harmonic content at frequencies 2–50 Hz and total harmonic distortion (THD) in bar charts and trend graphs; Inter harmonic measurement analyzes inter harmonic components from 0.1 to 19.9 Hz; Three-phase imbalance function calculates positive-sequence, negative-sequence, zero-sequence components and imbalance degree, displaying phase-angle vector diagrams; Flicker function measures short-term and long-term flicker values.
Transient event detection (including voltage spikes, voltage drops, interruptions, surge currents, and voltage transients) requires pre-set trigger thresholds; the instrument automatically captures and records abnormal events once in monitoring mode. Digital oscilloscopes enable real-time observation of voltage and current waveform details, aiding in identifying waveform distortion types.
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Step 5: Long-term Monitoring and Data Export
The monitoring recording function is activated, enabling the instrument to automatically save steady-state power quality parameters at preset intervals, including comprehensive data such as voltage and current, harmonics, power, imbalance degree, and flicker, with continuous recording capabilities ranging from several hours to dozens of days. Historical trend curves can be viewed at any time during the monitoring process.
Upon completion of the test, insert the USB drive to export the stored test data. Use the accompanying PC-based power quality data analysis software for in-depth processing to generate professional results such as trend charts, statistical reports, and exceedance analyses, ultimately producing a comprehensive power quality inspection report. After testing, shut down the device after a set number of seconds by pressing the power button, then organize the test cables and accessories and return them to the instrument case.
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Problem 1: Harmonic sources are complex, and conventional instruments cannot comprehensively assess harmonic pollution.
Problem description: Modern industrial environments contain numerous nonlinear loads such as frequency converters, rectifiers, and switching power supplies, generating a wide range of harmonics with complex compositions that include both integer-order and interharmonic components. Conventional multimeters or single-function instruments can only measure a limited number of harmonic orders, making it impossible to comprehensively assess grid harmonic pollution levels, identify harmonic sources, or evaluate their severity.
Solution: This instrument supports harmonic measurement across the full frequency range from 2 to 50 orders, while also detecting interharmonics from 0.1 to 19.9 orders, providing a comprehensive representation of the power grid's spectral distribution. It displays key parameters including harmonic RMS value, harmonic content, harmonic inclusion rate, and Total Harmonic Distortion (THD), accompanied by bar charts and trend graphs that visually illustrate the proportion of each harmonic order and its temporal variation patterns. This enables technicians to thoroughly assess harmonic pollution levels and provides robust data support for developing effective harmonic mitigation strategies.
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Problem 2: Voltage transient events occur sporadically and are difficult to detect, making fault causes hard to trace.
Problem description: Transient events such as voltage surges, drops, instantaneous interruptions, surge currents, and voltage transients are characterized by their sudden onset and short duration—typically lasting only a few to several hundred milliseconds. These events are difficult for human operators to detect, and subsequent analysis cannot determine their exact occurrence time, magnitude, or duration, leading to unclear causes of failures like sensitive equipment tripping or product failure, with similar issues recurring repeatedly.
Solution: The instrument features built-in automatic detection capabilities for various transient events. Upon setting thresholds, it enters monitoring mode and automatically captures and records voltage surge/drop interruptions (up to 40 events), surge current events, and voltage transients lasting over 20 microseconds (with a capture probability of 98.7%). Each event is recorded with start/end time, duration, and amplitude characteristics, achieving a time accuracy of ±10 ms for unattended fault waveform recording. Combined with long-term monitoring and logging functionality, it enables tracing of power quality anomalies spanning several days and precise identification of fault causes.
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Problem 3: Hidden three-phase imbalance risks compromise equipment safety operation.
Problem description: Uneven distribution of single-phase loads in low-voltage distribution networks can easily lead to three-phase imbalance, increasing line losses and reducing transformer output. In severe cases, this may cause motor overheating and maloperation of relay protection systems. However, the imbalance develops gradually and is often undetectable during routine inspections; by the time equipment abnormalities are identified, significant damage and energy efficiency losses have typically occurred.
Solution: This three-phase imbalance measurement device accurately calculates the positive-sequence, negative-sequence, and zero-sequence components of voltage and current, with an imbalance measurement accuracy of ±0.2% and phase-angle accuracy of ±0.3°. It simultaneously displays a three-phase phase-angle vector diagram, providing an intuitive representation of phase-amplitude differences. Combined with its long-term monitoring and recording capability, it enables continuous tracking of imbalance trends across all phases, identifies periodic exceedances, guides optimal load adjustments, and ensures balanced and safe operation of the power supply system.
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Challenge 4: Excessive flicker affects lighting and precision equipment, yet there is a lack of quantitative evaluation methods.
Problem description: Impact loads such as electric arc furnaces and rolling mills can cause voltage fluctuations and flicker, leading to light flickering and unstable operation of precision instruments. However, flicker is a subjective quantity related to human visual perception and cannot be directly measured with conventional voltmeters; there is no quantitative assessment method available, leaving enterprises without accurate data for handling complaints or evaluating power quality.
Solution: The instrument strictly complies with IEC standards for flicker measurement, supporting three evaluation levels: 1-minute instantaneous flicker, 10-minute short-term flicker (Pst), and 2-hour long-term flicker (Plt), with measurement accuracies of ±5.5% and ±5%, respectively. It quantitatively assesses the impact of voltage fluctuations on lighting and sensitive equipment to determine whether thresholds are exceeded. Combined with long-term monitoring capabilities, it can identify periods of excessive flicker and their severity, providing objective data for power quality management and defining responsibilities between suppliers and consumers.
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Challenge 5: The volume of on-site test data is substantial, resulting in low efficiency in preparing subsequent analysis reports.
Problem description: Power quality testing involves numerous parameters and massive data volumes, particularly when long-term monitoring generates vast amounts of historical data. Relying solely on instrument screens makes systematic analysis impossible. Traditional methods of manually organizing data, creating charts, and preparing reports are labor-intensive, inefficient, prone to errors, and fail to meet the standardized reporting requirements of professional testing institutions and enterprises.
Solution: This product comes with professional PC-based power quality data analysis software, allowing test data to be quickly exported to a computer via a USB drive. The software supports advanced features such as multi-dimensional data queries, trend curve plotting, exceedance statistics, and harmonic spectrum analysis, and can automatically generate compliant power quality inspection reports, significantly enhancing data analysis and report preparation efficiency. The instrument supports software upgrades via USB drives, eliminating the need for factory visits for subsequent feature expansions or algorithm optimizations and reducing long-term maintenance costs.
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Comprehensive Survey and Evaluation of Power Quality in Power Supply System Substations
The operation and maintenance department of power grid companies can utilize this instrument to conduct regular power quality surveys across substations of various voltage levels, providing comprehensive insights into parameters such as busbar voltage harmonics, three-phase imbalance, flicker, and voltage deviations. Its long-term monitoring capability records power quality data continuously for periods ranging from several days to dozens of days, which, when combined with PC-based analysis software, generates systematic evaluation reports that offer critical data support for grid planning, power quality improvement initiatives, and compliance assessments.
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Power Quality Diagnosis and Fault Troubleshooting in Industrial Enterprises
Industrial enterprises in sectors such as metallurgy, chemical engineering, and automotive manufacturing, which handle numerous nonlinear and impulse loads, can utilize this instrument to diagnose issues including harmonic pollution, voltage flicker, and three-phase imbalance in power supply systems, thereby identifying the root causes of problems like product quality defects, frequent equipment tripping, motor overheating, and faults in reactive power compensation devices. By leveraging precise detection data, it enables informed selection and performance evaluation of control equipment such as filters and reactive power compensators, ensuring stable operation of production facilities.
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Power Quality Testing for New Energy Power Plants During Grid Connection
For new energy power stations such as photovoltaic and wind power plants, it is essential to verify whether power quality parameters meet grid connection standards both before grid integration and during operation. This system can measure critical indicators including harmonic content, voltage deviation, frequency deviation, and three-phase imbalance at the inverter output, providing reliable testing capabilities for plant acceptance and daily maintenance.
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Power Quality Testing for Data Centers and Precision Manufacturing
This instrument is suitable for applications in facilities with stringent power quality requirements—such as data centers, semiconductor plants, and precision laboratories—to perform specialized tests for voltage sags, surges, transients, and harmonics, thereby evaluating whether the power supply meets the energy quality standards required by IT equipment and precision instruments. By continuously monitoring and analyzing the frequency of voltage sag events, it provides a basis for decision-making regarding the installation of power quality improvement devices like UPS systems or dynamic voltage restorer units.
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Third-party testing institutions' power quality testing services
Power testing companies and third-party metrology testing institutions can utilize this instrument as a standardized tool for power quality testing, undertaking commissioned power quality testing tasks from corporate clients. The device features comprehensive functionality and meets stringent accuracy requirements; its accompanying PC software generates standardized professional test reports, fulfilling the standardized and specialized demands of third-party testing services. Its portable design enables field deployment by technicians, enhancing operational efficiency.
This three-phase power quality analyzer delivers a high-performance, cost-effective solution for power quality testing and analysis across industries, featuring comprehensive coverage of 13 full-function tests, professional-grade measurement accuracy, robust transient event capture capabilities, advanced PC-based data analysis software, and user-friendly portability.
We remain committed to technological research and development as well as product innovation in power testing instruments. The introduction of this power quality analyzer further enhances our range of power parameter testing solutions, catering extensively to grid operators, industrial users, the renewable energy sector, third-party testing institutions, and other applications, thereby contributing to improved power supply quality and enhanced electrical safety standards.
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