With the development of industrial Ethernet technology, optical fiber technology and information processing technology, and penetration into the power industry, with the support of current technical conditions, industrial Ethernet communications show high reliability, flexibility and scalability during operation. The advantages play an important role in optimizing the connection and information transmission between the equipment components of the entire grid system. In the era of Industry 4.0, intelligence has become an important factor in measuring the level of urban development, and the construction of smart cities is an important trend in future urban development. Smart grids play an important role in the construction of smart cities in ensuring the safety of urban electricity consumption, improving urban network communication capabilities, stimulating the development of urban-related industries, and enriching urban services. With the development of economy and technology, cities are important The demand for electric energy is increasing, and the smart grid has become the foundation and driving force for the development of smart cities in my country. The smart grid is based on a stable grid framework. Through communication network technology and computer information technology, it can intelligently monitor the power generation, storage, transmission, transformation, distribution, power consumption, and dispatch of the power system to realize power and information , High degree of business integration. Smart grid not only means intelligent control, but also includes intelligent processing and management of grid operation information. In the process of building a smart grid, whether it is the observable, controllable, or adaptive characteristics of power information, it is inseparable from the support provided by information and communication technology. It can be said that the development level of information and communication technology determines the intelligence The speed and extent of power grid construction. In the process of building a smart grid, most substation equipment and generators, cables, lines, etc. have online inspection items. On-line power detection is an indispensable part of the smart grid. However, affected by the distributed and real-time characteristics of the power system, various detection devices have problems such as delays, path errors, or data packet loss in terms of information acquisition. So, in the era of Industry 4.0, what role does industrial switch play in the construction of smart grid? As the most important and effective power grid communication equipment solution, industrial switches have promoted the rapid development of online monitoring technology in the power industry. The standardization of industrial switch protocols has already been completed, including the underlying protocol, network redundancy protocol, management protocol, network precision clock transmission protocol, etc. The interoperable models of products from different manufacturers can achieve hybrid networking. The fanless, low-power industrial standard design of all models of industrial switch products under JHA Technology, and the temperature resistance range of -40℃～85℃ can fully meet the needs of industrial sites and meet the construction of power systems. At the same time, different models of products can adopt mixed networking methods such as segmented redundancy, intersecting loops, and tangent loops to improve the reliability of the networking; a variety of optical ports are flexibly configured, highly integrated, and the integrated design provides more power grid construction. convenient. Feichang Technology Industrial Switches play a huge role in data collection, production management, operation and maintenance, safety monitoring and user interaction.