This standard specifies the requirements for the use conditions, ratings, design and structure, testing, and other aspects of gas insulated metal enclosed transmission lines (GIL) with a rated voltage of 72.5kV and above and a rated frequency of 50Hz. This standard is not only applicable to the application of GB 7674, but also applies to situations where the provisions of GB 7674 are not applicable. For example, - All or part of the GIL is arranged on the ground, in trenches, shafts, tunnels, or directly buried—— GL is placed in whole or in part near public places; - Occasions with longer GIL
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