Nowadays phase-to-phase power supply lines are adopted to part of MV distribution networks in order to improve the cost-effectiveness. However, the propagation of traveling wave is complicated if the single phase-to-ground fault occurs, which affects the accuracy of the fault location. This paper proposes a novel method. It considers the propagation mechanism of traveling wave produced by single phase-to-ground fault, including phase-mode transformation, the velocity of different mode, and the

more »

... ropagation characteristic at boundary. Whether the fault position is at the phase-to-phase power supply lines or the three-phase power supply lines can be identified and the fault distance calculated based on the time difference of the arrival surge between the aerial-mode and zero-mode components. EMTP/ATP simulation software verifies the reliability and accuracy of the method.