经济性就是传动系本身的功率损失要小，即效率要高。
Economic is that power losing of the transmission system should be small, namely efficiency should be high.
泄漏损失是指液体从高压处漏回低压处所造成的功率损失。
Leakage losses is the liquid from the high voltage at low drain back to the premises caused by power loss.
定理表明：辐射型配电网任何逆流路径的二次电流矩等于该路径的功率损失。
The theorem indicates that QCM equals network power loss of the upstream path of the node.
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