除了依据基础资料外，还取决于输送功率的大小，与系统联系的紧密程度。另外主变选择的好坏对供电可靠性和以后的扩建都有很大影响。从而完成了110kV变电站电气部分的设计。
关键词：负荷计算，短路计算，变压器，继电保护I
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f第一章原始资料及其分析
原始资料
待建变电站在输电线路的终端，接近负荷中心，高压侧为110KV，经降压后直接向所属地区供电。因此，本变电站是按系统规划，为满足地方负荷的需要而建设的地区变电所。电压等级变电站的电压等级分别为110kV35kV10kV。110kV：2回35kV：7回10kV：12回地形地质环境
站址选择在地势平坦地区，位于城郊结合部，交通便利，进出线方便，完全污染轻微，待设计变电站选在黄沙土地壤时：电阻率不大于500。待建变电站负荷数据（表11）
表11待建成变电站各电压等级负荷数据
电压等级35kV
10kV
用电单位
市镇变1市镇变2煤矿变化肥厂
砖厂镇区变机械厂纺织厂1纺织厂2农药厂面粉厂耐火材料厂
最大负荷kW600r