AN IMPROVED GAS INSULATED SUBSTATION (GIS) DISCONNECTOR SWITCH

摘要

An improved gas insulated substation (GIS) disconnector switch (DS) comprising of : a fixed contact shield (04) covering a fixed contact (FC) (01), a moving contact shield (06) surrounding a moving contact (MC) (05), wherein both the FC shield and MC shield are insulated from a grounded metallic enclosure (09) by means of SF6 gas with appropriate density which fills the enclosure (09), and MC shield is separated from FC shield be a distance D which is proportional to the system voltage and SF6 gas density, characterized in that the E-field around the contact system is made uniform by profiling the fixed contact and moving contact shields and the axial E-field between the MC and the FC shield is made uniform by keeping radius of curvature of moving contact main body (R1) greater than the radius of curvature (R2) at the throat of the moving contact while keeping the outer radius of curvature of the FC shield (R3) higher than the radius of curvature (R4) of the FC Shield around the central axis .