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SF6 insulated load switch underground substation leakage test

33kv 35kv 36kv Mv Sf6 Gas Insulated Switchgear Gis ... leakage rate is less than 0.1% per year. Electrical and mechanical bushings penetrating the tank are clamped and sealed to the tank by high quality O-rings. All SF6-tanks have to pass a leakage test before gas fill-ing.Leakage test and gas filling are done inside a vacuum chamber. The first step in the leakage test is to evacuate all air ...

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