Product Introduction

Electricity quality refers to the quality of alternating current electricity supplied to the user end through the public power grid. In layman's terms, it's about the good or bad condition of the electricity in the power grid lines. Electricity quality issues are mainly caused by the terminal load side. For example, impulse reactive loads can cause drastic fluctuations in grid voltage, thus reducing the quality of supply.

With the development of power electronics technology, it has brought the positive aspects of energy conservation and transformation to modern industry. However, the extensive application of power electronic devices in various industries has also caused more severe damage to power quality, making them the main source of harmonic pollution in power grids.

The increasing use of rectifiers, variable frequency drives, arc furnaces, electrified railways, and various power electronic devices in the distribution networks at each user end of the power grid is causing impact or so-called power pollution to the electrical grid. This leads to voltage instability, overvoltage, and the generation of harmonics. Harmonics reduce the efficiency of electricity production, transmission, and utilization, causing overheating of electrical equipment, vibration, noise, and insulation aging, shortening lifespan, and potentially leading to malfunctions or damage. Harmonics can also trigger parallel or series resonance in局部 of the power system, amplifying harmonic content and causing devices like capacitors to burn out.

The nonlinear, impulsive, and unbalanced power consumption characteristics of these loads severely pollute the quality of power supply. Therefore, eliminating the problem of high-order harmonics in the power supply and distribution system is of great significance for improving the quality of electrical energy and ensuring the safe, stable, and economic operation of the power system.

On the other hand, modern industrial, commercial, and residential users' electrical equipment is more sensitive to power quality, demanding higher standards of supply. Currently, harmonics, electromagnetic interference, and reduced power factor are listed as the top three scourges of the power system.

When the quality of electrical power in the power grid is disrupted or polluted, and does not meet national standards, targeted improvements to the power grid's electrical power quality are required. To understand the actual quality of electrical power in the grid, corresponding equipment must be used for testing and analysis. In response to domestic conditions, Longdian Electrical has timely developed and produced specialized electrical power quality analysis instruments tailored to the national situation.

Product Synonyms: Three-Phase Power Quality Analyzer, Portable Three-Phase Power Quality Tester, Portable Three-Phase Power Quality Meter, Power Quality Analyzer

Product Features

◆ Multi-channel measurement: Simultaneous measurement of 4 voltage channels and 4 current channels.

Electrical parameter measurement: capable of measuring parameters such as voltage magnitude, current magnitude, phase, frequency, active power, reactive power, and power factor simultaneously.

◆ Measurable for voltage and current harmonics content up to 2-64 times.

◆ Measure interharmonic content of voltage and current from 0.5 to 31.5 times.

Total Harmonic Distortion Rate (THD) for both voltage and current measurement.

◆ Measure short-time flicker (PST), long-time flicker (PLT), and voltage fluctuations;

Measure positive sequence voltage, negative sequence voltage, zero sequence voltage, and voltage unbalance degree.

◆ Measures positive sequence current, negative sequence current, zero sequence current, and current unbalance degree.

◆ Transient parameter measurement function with the capability to record voltage surge and drop events, simultaneously automatically initiating waveform recording to document the occurrence time and the actual waveforms of the five preceding and following cycles.

◆ Features oscilloscope functionality, allowing real-time display of voltage and current magnitude and distortion, with the ability to zoom in on the voltage and current waveforms on the instrument; equipped with waveform factor calculation capability.

◆ Hexagonal diagram display function for vector analysis of metering loop and protective device loop, enabling checking of metering device wiring errors; automatically identifies 48 wiring configurations during three-phase three-wire connection; automatic calculation of supplementary electricity consumption for ease of use in calculating supplementary electricity for users with wiring issues.

◆ Optional large clamp meters can measure the ratio and phase difference of low-voltage current transformers.

Harmonic content can be displayed in a histogram, offering a good visual effect.

◆ Built-in high-capacity data storage, with selectable storage intervals from 1 second to 1000 minutes; can continuously store data at 1-minute intervals for over 18 months.

10-inch large screen color LCD monitor with 1280×800 resolution

Capacitive screen touch operation, similar to tablet and smartphone use, simple and easy to learn.

Supports mouse operation, adaptable to personnel with different operational habits.

◆ During harmonic measurement, the national standard can automatically identify whether the content of each harmonic is exceeding the standard and provide a prompt, making it clear at a glance.

Harmonic Content National Standard Query Function, allows for querying the permitted values as per national standards.

◆ Features a frequency measurement range of 42.5Hz-69Hz, capable of measuring 50/60Hz power systems.

Data can be stored on a USB flash drive for historical inquiries.

Available with dedicated data analysis and management software, it can analyze and process test results, enabling the grasp of the power quality and periodic load changes of the tested points. It plays an irreplaceable role in helping power workers understand users' power quality and take appropriate measures.

The analysis software can generate professional power quality analysis reports in accordance with national standards.

The instrument features a screenshot function, allowing manual saving of any displayed data on a screen as an image.

◆ The instrument is compact, lightweight, and easy to carry.

◆ Equipped with a high-performance lithium-ion battery, automatically switches to power-saving mode, allowing the instrument to operate for over 10 hours without an external power source, convenient for on-site testing.