Compact switching technologies, state-of-art and future trends

The development of EHV and UHV substation equipment have been proceeding to cope with the electricity demand expansion due to economic growth in the world. Simultaneously, the requirements for substation equipment compactness, cost reduction and efficiency also have been emphasized in the competitive market. This paper introduces several examples of recent developments on the compact and reliable switching technologies. They include advanced diagnostic techniques based on field data for operation and maintenance, and monitoring and diagnostic systems, controlled switching supported by information technology with the latest sensor technology and information network.