Study of fault location for teed lines with parallel branches

A new fault location method is proposed in this paper for the teed lines with parallel branches based on the determinant of the faulted branch. When one branch is fault,the faulted electrical measurements are calculated. Based on the positive network,two necessary parameters are calculated to distinguish the faulted branch,namely,the fault of the non-parallel branch,cross fault of the parallel branch and the one-line fault of the parallel branch. Then,the non-fault branches are united and the fault location for the faulted branch can be implemented. The location method can locate the faulted point not only for the single-branch but also for the parallel branch,overcoming the difficulty of fault location when parallel branch occurs in the teed lines. A lot of ATP simulation results indicate that the fault location accuracy is not influenced by such factors as faulted branch,faulted type,generation mode and the faulted resistance.