A Novel Current Travelling Wave Based Single-ended Fault Location Method for Locating Single-phase-to-ground Fault of Transmission line

Current travelling wave based single-ended fault location method needs to recognize the travelling waves propagating from the fault direction as well as the travelling wave reflected from the fault point or remote-end bus. This paper firstly compares the current travelling waves of the fault line and the longest health line connected to the local bus based on dyadic wavelet transform to obtain the current travelling waves propagating from the fault direction. Secondly, based on the cross transmission phenomenon of modal travelling waves under the scenario of single-phase-to-ground fault, the arrival sequence relation and the polarity relation of aerial-modal component and zero-to-aerial-modal component (i.e. cross transmission component) of the current travelling waves reflected from the fault point and the remote-end bus are investigated and the source of the second current travelling wave propagating from the fault direction is identified. Thirdly, the first and the second current travelling waves propagating from the fault direction are utilised to locate the single-phase-to-ground fault. Finally, a large number of EMTP based simulation cases are used to test and validate the proposed fault location method.