Section Location Technology Based on Minkowski Distance of Three-phase Asymmetric Current Components

¹ State Grid LiaoNing Electric Power Research Institute, Liaoning, Shenyang 110000, China .
² Beijing DHHB Power Science and Technology Co.,Ltd, Haidian District, Beijing 100085, China .

^* Corresponding author’s e-mail: kejian1986@163.com

Abstract

Fault components in the fault path and the non-fault path differ due to the unbalanced distribution of positive, negative and zero-sequence components in the line in the case of a single-phase earth fault in the power distribution network. Therefore, this paper proposes an improved fault section location algorithm based on phase current, which obtains the fault component current by the subtraction of currents before and after the fault and the fundamental wave amplitude of the corresponding current through Fast Fourier Transform (FFT). Meanwhile, considering that the fault section location cannot be completed accurately with the amplitude relationship alone, the Minkowski distance calculation formula is introduced to strengthen the difference between the fault path and the non-fault path, and the relationship between the calculation results of different sections and the threshold is compared by threshold setting to complete the section location. This paper proposes the specific fault section location process and criteria and verifies the feasibility of the algorithm through simulation experiment.