Abstract:In order to realize the real-time management and control of the auxiliary equipment in the substation and the status and status of the power grid equipment by the operation and maintenance station,a substation IoT system was designed,and application tests were carried out on this basis.The system uses Lora spread spectrum wireless communication technology to achieve full site networking coverage,uses SHA256 secure hash algorithm to realize the security verification of communication between different devices,and uses Alibaba Cloud Internet of Things platform and 4G modules to achieve remote information interaction;it focuses on completing the upper computer software,the hardware circuit of the lower computer,and the program design of the lower computer based on the μC/OSIII system.Through testing and application,the system realizes the interconnection of all-site equipment and remote information interaction for substations of different structures,and provides an example for the establishment of the Internet of Things in the substation.