三节点环网中输电线路的故障测距

在环网中，由于网孔中有环网电流，故障线路障碍点两则的电流不再服从简单的并联支路电流分配的规律。因此，文献中大量引用的“双侧电源单一线路”的测距计算公式，不适用不环网，本文推导出三节点环网中输电线路故障测距的计算公式，模拟计算结果表明：所推导了计算公式是正确的，可用于具有相同拓扑结构的环网。

Fault Location for Transmission Lines in Triple-Fed Network

In network with mesh the currents on the two sides of fault node do not obey the law of current distribution for parallel branches due to the participation of mesh current flowing through the fault line.Therefore,the fault locating formula based upon the duble-fed single line model and frequently referenced in literatures can not be applied to network with mesh.In this paper,fault locating formula for transmission lines in triple-fed network is derived.The result of simulated calculation shows that the derived formula is correct and can be applied to real mesh with the similar topological configuration.