Since the research and development and application of intelligent substation, distribution automation, dispatching automation and other systems have just started in the same period, there are problems such as scattered demand and various systems, that is, the system platform is not uniform, and it is difficult to realize interconnection and information between systems. Sharing, resulting in intelligent electrical equipment such as intelligent low-voltage electrical appliances produced by different regions and different manufacturers, or information between high and low voltage power grids, data uploading is not possible, the release is not smooth, and the goal of power automation cannot be fundamentally realized. Therefore, it can be seen from the above point that the low-voltage switchgear should ensure the continuity of the protection circuit by direct mutual effective connection or by mutual effective connection by the protective conductor. To determine the cross-sectional area of ​​the protective conductor, it should be considered to cooperate with the protection device action value, without damaging the protective conductor or destroying the continuity of the protection device during the operating current and time range.
Undoubtedly, in the low-voltage electrical industry in China, low-end products are still in mass production. These products are bulky and consume a lot of precious metals such as silver and copper, ferrous metals, plastics, etc. Many materials are subject to international market prices. Therefore , the situation that the prices of major raw materials for low-voltage electrical appliances remain high (and continue to rise) will be difficult to change. With the continuous development of smart grid, urbanization construction and new energy construction, low-voltage electrical appliances with intelligent functions are increasingly valued by power distribution system suppliers. The low-voltage intelligent electric appliance should have the basic features of more than four functions, that is, the protection function is very complete, the actual current parameter is measured, the fault record and display, and the internal fault self-diagnosis. Intelligent low-voltage electrical appliances are the basis for realizing the management and operation of smart grids, and are bound to become the mainstream products in the market.
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