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SF6 66 kv gis switchgear Recovery enervac

COLD-WEATHER APPLICATION OF GAS MIXTURE (SF6/N2, …· PDF fileinterconnected transmission system are 115, 138, 230 and 500 kV. The northern collector system consists of isolated 138 kV and 230 kV systems connected to the northern high-voltage direct current facilities. Sub-transmission and distribution voltage levels are 66, 33, 24.94, and 12.47 kV.

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