Understand the functions, features and application fields of power quality analyzer in one article

Power quality usually refers to the quality of voltage, current, and power supply. The power quality analyzer, which is a modern instrument for analyzing and testing this aspect, is mainly composed of five parts, namely, the measurement conversion module, the analog-to-digital conversion module, the data processing module, the data management module, and the peripheral module. The measurement conversion module consists of a voltage transformer, a current transformer, and a signal conditioning circuit; the data processing module includes DSP and external memory SDRAM and FLASH; the peripheral module consists of display, storage, and communication submodules.

Power quality analyzer features

Measure and record various power quality parameters, including: voltage, current, phase, system frequency, power, power factor, system frequency, voltage deviation, three-phase voltage, current unbalance, voltage fluctuation and flicker, 2nd to 50th harmonics, interharmonics, etc., capture and record transient waveforms, voltage swells and sags, etc.

4-way voltage and 4-way current input can detect zero-sequence voltage and current simultaneously. Each phase voltage is isolated from each other and can be applied to various wiring methods such as Y-type, △-type, V-type, etc., with small phase interference and good safety. 8-channel 16-bit A/D synchronous sampling ensures measurement accuracy and real-time performance.

The collection front-end and management back-end are connected via WiFi wireless communication. The monitoring operation is not restricted by location, which is more flexible, convenient and safer.

The acquisition front end uses a dual-core high-speed processor with fast processing speed; it has a data storage function and can be transmitted to the management background via WiFi for processing at high speed after the monitoring is completed, reducing the working time of the management background measurement and extending the working time.

The management backend can use tablet computers or laptops of various grades. The display can be adaptive between 5-15 inches, with a wide range of resolutions. The storage capacity exceeds 16G, and all data for more than 1 year can be saved. It makes full use of the powerful operation, display, management and interface advantages of computers, which greatly facilitates the use of users.

It has powerful data statistics and analysis functions, which can count the maximum value, 95% probability value, average value and minimum value, calculate the qualified rate, generate statistical reports for a specified time period, etc.; it can give detailed data analysis results and draw a variety of change curves (including phase separation curves and composite curves) to better observe each phase curve or compare the three-phase comprehensive curve. Then it can accurately and intuitively reflect the test site situation.

Power quality analyzer application areas

In a broad sense, power quality analyzers are mainly used in power grid departments, but with the requirements of national policies, enterprises are increasingly concerned about power efficiency. Generally speaking, they are mainly used in power grid industry, power generation industry, large industrial energy-consuming industries (chemical, steel, petroleum, coal mining, etc.), automated production enterprises, transportation tracks, scientific research institutions, etc. Judging from the domestic industry situation, Zhiyuan Electronics' E6500 power quality analyzer is almost popular in various domestic industries.

There are foreign ones such as Fluke and Hioki, but they are also relatively expensive. There are many power quality analyzers in China, and the one I know is ZLG Zhiyuan Electronics' E6000 handheld power quality analyzer. It has a compact body, is easy to carry, supports waveform analysis, and supports up to 10 minutes of full waveform recording. The waveform analysis software is equipped with customizable international reports. In the recorder mode, real-time recording is easily achieved, and the power items can be customized to be recorded. The industry's highest measurement accuracy is "0.1%.