This guide addresses most imortant requirements for the high voltage gas-insulated substations above 52 kV, providing specification guidance for users, manufacturers and the engineering firms whie defining the project specific needs. This guide, where feasible, aligns with international norms and standards and recognizes international practices used outside North America, providing a comprehensive guide with widespread application.This guide covers the technical requirements for the design, fabrication, testing, installation, and in-service performance of gas-insulated substations(GIS). In line with the user functional one-line diagram, the supplier should furnish all components of the GIS such as circuit breakers(CB), disconnect switches(DS), maintenance ground switches (MGS), fast-acting ground switches(FGS), voltage transformers(VT), current transformers(CT), SF6-to-air bushings, SF6-to-cable terminations, surge arresters, all the necessary interconnecting housings, control cabinets, density monitors, interconnecting cables, SF6 gas for initial filling etc. All equipment and material shall be prefabricated, factory assembled, tested and shipped in largest practical assemblies. Assembled equipment should be capable of withstanding electrical, mechanical, and thermal ratings of the specified system for indoor or outdoor istallation. Optimized arrangements should allow reduced installation time, ease of operation, minimize maintenance and repair costs with provision for future extension. Users should identify any limitations in space and accessibility constraints. Life-cycle costs are considered by the users during evaluation of the proposals.
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