ARCHITECTURE OF A WEB-BASED

With the deregulation of the electrical power industry, there is a strong need for power SCADA system to interoperate with other information systems. The interoperation between SCADA and all other systems not only needs the information sharing, but also the business- or transaction-based information integration. This paper presents a Web-based architecture for power SCADA system, which is a multi-tier distributed framework using J2EE technology. This architecture combines pervasive browser with flexible user-specified application client, supports Web-service integration and transaction control, and provides a unified security policy. With the advantages of J2EE platform, this new Web-based SCADA system seamlessly integrates traditional SCADA with the enterprise information system, and exhibits more flexibility, scalability, and security than precious Web-browsing-only SCADA system