A novel double ended method for fault location based on travelling wave time-series

Abstract

In this paper, a novel double ended travelling wave method for fault location is proposed. Comparing with traditional fault location approaches, it is independent of time synchronization and easy to distinguish between the initial incident wave and the reflected wave from the remote end compared. In this method, for each end (e.g. M-end and N-end), arrival time of the first travelling wave is taken as its initial time after a fault, so the follow-up travelling wave arrival time can be determined. All arrival time of each end can be regarded as time-series set (T M and T N ) respectively. Furthermore, the time (t 1 , t 2 ) relevant to fault location can be obtained by the intersection (T M ∩ T N ) of double ended sets. According to reflection coefficient difference in the M and N bus bars, the double ended wave-front amplitudes at t 1 and t 2 can be used to identify the end to which the point of fault is closer. And then the fault location can be calculated with high accuracy. PSCAD simulations are used to verify the feasibility of this method.