connection model of MV distribution

代码说明：

说明：  在不同供电区域负荷密度和不同变电所容量条件下 ,对中压配电网常见的几种接线模式进行了经济性和可靠性计算分析 ,研究其随负荷密度和变电所容量变化的趋势 ,以及在相同条件下不同接线模式之间的比较。(Under the conditions of load density and different substation capacity in different power supply areas, the economic and reliability calculations of several common wiring modes of medium voltage distribution network are carried out, and the trend of load density and capacity change of substation is studied. And a comparison between different wiring modes under the same conditions.)