针对110/20 kV、220/20 kV变电站20 kV侧的几种可选接线方式，从可靠性、灵活性、经济性、过负荷裕度和工程投资等多项技术经济指标进行分析比较，提出20 kV侧的最优接线方案，为合理选择工程接线提供依据。

Aiming at several optional connection modes of 20 kV for 110/20 kV and 220/20 kV substation, the technical and economic indexes are analyzed of reliability, flexibility, economy, adequacy and investment, as a result that the optimal selection is proposed for design, providing references for feasible selection of engineering connection.