In recent years, because of the continuous growth of the power load, the higher requirements of the power supply capacity of power distribution network are put forward. This paper analyzes the power supply capacity of power distribution network by the concept of St. Clair curve. In the premise of guaranteeing the quality of electric energy and thermal stability limit, the power supply capabilities of the power grids of 10kV and 20kV are analyzed.%近年来，由于电力负荷的持续增长，对配电网的供电能力提出更高的要求。本文引用了St.克雷尔(Clair)曲线的概念对电网供电能力进行了分析，在保证电能质量和热稳定极限的前提下，对目前10kV与20kV电网的供电能力进行分析。
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