USB based secure implementation of web system in master station

For many WEB systems of master station, their usability often depends on the validity of virus isolation. Considering the main characteristics of power automation master station which has moderate data volume and processing speed, a USB based WEB system implementation method is proposed with logical virus isolation effect. USB 2.0 transmission lines are used to connect internal network and external network. Data communication is fulfilled by self-defined protocol. The computers in external network can access internal historical database and real-time database in high speed. Analysis and application demonstrate that the security effect is comparable to physical disconnection. (4 pages)