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With the accelerated deployment of 5G new infrastructure, terminal application business has been gradually extended to various vertical industries.Although 5G technology can also adapt to the differentiated communication requirement for power industry, the power industry currently lacks a kind of 5G module that not only meets the security access requirement for power grid, but also has the advantage of low hardware upgrade cost, flexibility and scalability.Therefore, a 5G lightweight hardware encryption module for power terminals was designed and developed.The module is connected with the power terminal in the form of pluggable interface, and the capability of 5G communication and encryption authentication could be quickly realized just by terminal software upgrade.The test results show that the module has chip-level security authentication capability, and can take into account 5G communication and security mechanism, which not only improves the security of terminal access to the power intranet, but also reduces the difficulty of terminal transformation and 5G communication hardware upgrade cost.

The transmission ratio of NN reducer is discrete and nonlinear, and the gear matching method determines the volume and stability of a reducer. In previous studies， most scholars tried to find out the key parameters affecting the change of transmission ratio or the change rule of transmission ratio. However， the search method is complicated and tooth matching method is single. An improved differential evolution algorithm is proposed to search the transmission ratio. The constraint variables of the teeth in the transmission ratio are analyzed， and the global search of the transmission ratio and the matching method within the specified range is carried out by using the four-fold cyclic logic. An adaptive differential evolution algorithm is improved， and the forced intervention differential evolution algorithm based on the change of the optimal trait is proposed， which adjusts the mutation operator timely based on the change process of the optimal trait in each evolutionary period. Taking the solution of the maximum transmission ratio as an example and based on the global search results， the possibility of using differential evolution algorithm to solve the transmission ratio problem of NN reducer is verified.

With the development of smart grid and the increasing of network application within the electric power information network,electric power CDN plays an important role of network acceleration technology,traffic load balancing and network security.However,facing the rapidly changing of application requirements,electric power CDN was required to response to the application deployment quickly and possess flexible application extensibility.In addition,there are some problems on electric power CDN node expansion,such as complex operations management and low utilization rate of resources.It is necessary to reform the traditional power CDN architecture,SDN and NFV technique can support.The data control can be extracted and transmitted by SDN from the network data,so it is conducive to expand a variety of application in power CDN rapidly.And NFV can expand the CDN node capacity and schedule node resources based on the application.It can effectively reduce the capital ecpenditure,storage and power consumption.