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With the grid scale expansion and the development of modern science and technology, the power quality is becoming more and more important. This includes two aspects: on the one hand, the factors that cause power quality problems is growing, such as the use of electrical installations on behalf of the non-linear load, the start and stop of a variety of large-scale electrical equipment caused a lot of power. A variety of complex, precision, power quality sensitive electrical equipment, on the other hand, the growing popularity, such as high-performance home appliances, office equipment, precision test instruments, precision production process automatic control equipment, etc., the power quality requirements increasing power quality problem has become a serious threat to the safety of the power grid and the national economy, economic, efficient operation, and affect the product quality and the quality of life of the people's daily life, it can be said, from the current status quo. In this paper, the definition of power quality problems, classification and power quality national standards, summed up the principle of measurement and calculation analysis method for the power quality technical indicators for power quality monitoring device developed to provide a theoretical basis and algorithms. This paper designs a new type of power quality monitoring device based graphical interface, the main operator interface to the power distribution system Pictured, different from the user interface dialog box, good human-computer interaction, intuitive, easy operation. Using state-of-the-art digital signal processing technology and computer technology to analyze a variety of problems and solutions in the design of power quality monitoring devices, introduce a software system in data sampling, data processing, human-computer interaction and data management functions and achieve Describe how to take advantage of multi-threaded programming method and the double-buffer data exchange, real-time monitoring of power quality indicators, recording and analysis. The test results show that correct the power quality monitoring device design, stable operation, high accuracy, it can achieve the long-running wave recording, real-time measurement analysis, historical data management functions, compared with the traditional instrument, with a full-featured, high-precision , simple operation, the ability of data processing and graphical report output, etc., for the production, operation and management of the electricity sector to provide a rich, full measured record information for the power technology workers provide a reference to the choice of compensation and devices
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