Basic information on Gas Insulated Substation (GIS)

This paper gives an overview about design of GIS, technologies, and worldwide experiences. The steps of technical development, stages of technical design, state of the art in the production, and quality insurance are explained with practical examples. Focus is given to applications worldwide with typical projects shown, including on-site works, sequences of erection, testing, and civil works. Explanations are given about the operational primary equipment (switching, grounding, disconnecting), secondary system, gas handling, maintenance, and monitoring. All requirements are met to have a safe handling of SF₆ even under the assumption of an increasing demand for the use in the electrical power supply.