电力电缆日益广泛地应用于输配电系统，为了减少电缆故障停电损失，对电缆故障测距的精度要求越来越高。
With more power cable application in transmission and distribution systems, the higher demand of cable fault location accuracy is necessary for reduction of the power cut loss.
在低压配电系统中，如果设计、选择不当，就会造成事故和损失。
In the low-voltage distribution system the risk, if poorly designed or not properly selected, it will cause accidents and 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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