From an evolutionary point of view, loops seem inefficient because of the redundancy inherent in a looped network.

从进化的观点来看，环状网络固有的冗余似乎使它毫无效率。

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Based on optimal principle, a new mathematical model for flow distribution of looped network was put forward.

根据优化原则，建立了环状给水管网流量优化分配的数学模型。

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And then, according to the features of the looped power supply network, the paper educes the applied calculating methods of two-node power system and more-than-three-node power system respectively.

之后，结合环形供电网络的特点，给出了二节点和三节点以上环形电力系统短路电流的实用计算方法。

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