某220KV区域性变电所一次系统设计。主变为2×120MVA，电压比为220/121/10.5KV，容量比为100/100/50，本期工程一次建成，设计中留有扩建的余地。-220KV substation of a regional one system design. Main becomes 2 × 120MVA, voltage ratio 220/121/10.5KV, the capacity ratio of 100/100/50, the current project once completed, the design leaves room for expansion.
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