Method of Single Phase Short Circuit Detection on Overhead Transmission Lines of an Industrial Plant Electric Power Supply System

Abstract

Existing methods for a distant single-phase fault detection produce a desired effect for a long lines and inapplicable to industrial electric power supply systems with a relatively short 110-220 kV overhead transmission lines. Hence, the authors elaborated the method of a fault detection enabling distant single-phase fault detection on a short overhead line (starting at under 0.7 km). To implement this method, the authors developed mathematical models of overhead transmission lines of different configuration and the algorithm of a line single-phase short circuit mode computation. This algorithm is based on the methods of subsequent reduction and symmetrical components. Overhead lines models take into account the number and type of a wire and rope and also their mutual  arrangement and the distance between the wire and ground. The models and algorithms were applied to KATRAN-OMP software. The method accuracy assessment demonstrated that the error is within 700 m which is a satisfactory result for a distant single phase short circuit detection on a 100-220 kV transmission line in an industrial electric power supply system.