Compact gas-insulated systems for high voltage direct current transmission: Design and testing

New DC insulators for HVDC GIS were designed by geometrical optimization and insertion of a current collector. With additional marginal changes at interface components, and with the development of special current- and voltage transformers, it is possible to provide gas-insulated systems for HVDC. Type tests standards for gas-insulated systems specific for HVDC are not yet available today. Based on insulation co-ordination studies, test values were defined, which take all technical aspects into account. Based on the development and research results combined with the service experience new type test philosophy was developed. The manufacturer of HVDC GIS systems has already successfully concluded the component tests and the technology is now ready for its first pilot installations.