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An embedded Ethernet based on microcontroller ADUC812 and industrial Ethernet controller 8019AS are designed to deal with the problems of power quality monitoring system. This paper proposed a two-level power quality monitoring system which consisting of a general control layer and a field monitoring layer, the monitoring system is used to monitor the three-phase voltage, current and neutral current RMS of power network as well as other parameters in real-time, including three-phase unbalance, power factor, and power frequency. The main computer uses Lab VIEW as programming software to perform all the functions required for monitoring in the form of animations, charts, curves and virtual panels. This system not only has the feature of being easy to expand the functions and flexible configuration, but also has a high cost performance. So, it can meet the power quality monitoring requirements of modern industrial and civil constructions. Introduction With the improvement of national economy and living standards, the use of high-power electronic products and other asymmetric impact and non-linear load capacity continue to increase the voltage waveform distortion, voltage fluctuation and three-phase unbalance [1] . The problem is also becoming more and more prominent, so it is of great practical significance to study how to effectively implement on-line monitoring, analysis and data preservation for the power quality of sensitive loads [2,3]. Although the field bus technology is relatively mature, but it was difficult to achieve a unified field bus standard in different environments [4,5] . Therefore, the power distribution system of industrial and civil constructions need to developed a monitoring and management system which communication network with low cost, stable performance, multiple transmission media options, wide application, and rich shared resources. Based on ADUC812 single-chip microcomputer and Ethernet controller 8019AS, this paper designs an embedded industrial Ethernet that can collect data in real time, and then uses it in power quality monitoring system to monitor various power quality parameters of power grid in real time. The software uses the graphical programming software Lab VIEW language as a development tool, with high reliability, high operating efficiency and a relatively intuitive software operation interface. Monitoring System Overall Design Because the power distribution environment is very complex and changeable, the user is far away, and the production layout is scattered. Therefore, the power quality monitoring network should be constructed by using industrial Ethernet suitable for high speed and long distance [6]. . The system is a network-centric security monitoring system consisting of the overall control management layer and the field monitoring layer. In Figure 1, the core of the overall control management is the general control management computer, which adopts the dual-host redundant monitoring mode [7,8] . Its main task is to send the commands to the data acquisition devices of the field monitoring layer. The field monitoring layer is mainly composed of various sensors and microcontrollers. Its main task is to complete the data collection and storage of various monitoring quantities according to the general control management computer, and upload the collected data according to the requirements of the main control computer. When the field monitoring layer is separated from the general control

Design of Power Quality Monitoring System Based on Industrial Ethernet