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德国 EVS公司为了保证电网的安全运行 ,对已运行了 2 5年的 110 k V和 2 0 k V电网的控制系统进行了一体化的技术改造。该工程包括 3个 110 k V系统控制中心和 4个 2 0 k V控制中心。这 7个控制中心已于1997年投入使用 ,但到 2 0 0 0年还将再建 2个同样技术水平的控制中心。为?
In order to ensure the safe operation of the power grid, the German company EVS conducted an integrated technological transformation of the control systems of the 110 kv and 20 kv grids, which have been operating for 25 years. The project includes three 110 k V system control centers and four 20 k V control centers. The seven control centers were put into operation in 1997, but another two control centers of the same technical level will be built by the year 2000. for?