A New Single Ended Fault Location Technique Using Travelling Wave Natural Frequencies

The relationship between the spectra of traveling waves, the fault distance and the terminal conditions of transmission lines is discussed. Especially the effects of the system equivalent impedance to the traveling wave spectra are studied. A novel frequency domain approach to the single-ended travelling wave fault location is presented. Firstly the dominant component of the traveling wave natural frequency is extracted. Then the propagating velocity, the reflection angles at the line end and fault point at this particular frequency are determined. Finally the fault distance can be derived. The accuracy of the algorithm is verified by simulation cases of various fault distances and fault types.