220kV（含20kV）变电站主变规模研究

中压配电网采用20kV电压等级供电,能够较好地解决10kV配电电压较低而导致的输送容量小、供电半径短、线路通道拥挤、线路损耗大等问题。由于目前20kV中压配电电压等级在我国范围内处于试点推广阶段,220kV(含20kV)变电站主变规模选择缺乏相关规划设计依据。为此,通过建立网络规模、网络损耗及综合费用估算三个计算模型,对2种电压等级序列,2种线路架设方式及10种负荷密度情况下网络进行了计算研究,得出了不同情况下推荐220kV(含20kV)变电站的合理主变规模。

Study on the Scale of Main Transformer in 220kV (With 20kV) Substations

Using 20kV voltage grade in the medium-voltage distribution networks, can well solve the problems of small transmission capacity, short power supply radius, congestion of line channels, large line loss and other issues, which caused by the low voltage grade of 10kV. As the 20kV is in the pilot and promotion stage in our country, selecting the scale of main transformer in 220kV (with 20kV) substations lacks related basis for planning and design. This paper established three computational models of the scale of networks, the loss of networks and the comprehensive cost estimation, and computed on the models of the networks which have 2 kinds of voltage levels, 2 kinds of line erection modes and 10 kinds of load density, to have obtained the reasonable scale of main transformer in 220kV (with 20kV) substations in different conditions.