Main Features Hyosung GIS is designed for maximum safety of product and user Compartmentalized structure Gas compartment structure prevents expansion of accident to the whole area. Bellows at the tank connector Bellows absorbs temperature changes, tolerances in assembly, differential settlement of concrete base, and excessive displacement caused due to earthquake, maintaining mechanical safety of the system. GIS model that passes the internal arc test Hyosung GIS is C-GIS that passed the internal arc test and is recognized with its stability in operation. Satisfy customer’s needs by the world’s first commercially available of 4000A, 3150A main bus Offer bets solution considering the customer installed capacity. Hyosung GIS adopts the best design technology available Hyosung GIS adopts the latest design technologies such as 3-D electromagnetic analysis, structural analysis and heat distribution analysis, based on the know-how acquired through development of ultra high voltage GIS such as 362kV and 800kV. Insulation performance test (Electric field analysis) Magnetic Field Analysis Techniques VCB Design test_Electric field analysis DS Design test_ Electric field analysis current density vector customer temperature rise percentage of allowance customer temperature rise percentage of allowance limitation limitation permission permission electric field 1.0 p.u ㎸/㎜ less percentage of allowance electric field 1.0 p.u ㎸/㎜ less percentage of allowance strength strength electric field magnetic flux density Design criterion 8% strength to 0.92 p.u ㎸/㎜ maximum electric 0.901 p.u ㎸/㎜ Design criterion 10% ground percentage of allowance field strength percentage of allowance interpolar electric Design criterion 5% field strength 0.85 p.u ㎸/㎜ percentage of allowance - rated gas pressure : 0.1 Mpa - rated gas pressure : 0.1 Mpa current-applying performance verification (analysis of heat flow) 3-D design calculation temperature desired analysis percentage of customer rise limitation value value allowance VCB operating 75k 65k 63.1k 16% connection VCB fixed 75k 65k 53.4k 29% connection temperature desired percentage of position rise limitation value test value allowance VCB operating 75k 65k 61.2k 18% connection VCB fixed 75k 65k 49.6k 34% connection Secure 4000A electric current-applying performance and target percentage of allowance above 15% by meets the temperature rise threshold by design improvements of VCB Heat dissipation structure.