A Novel Method for Earth Fault Direction Detection in Compensated Networks

Abstract

In recent years the number of decentralized generators has risen significantly. Due to the resulting bidirectional load flow, new protection concepts for electrical networks are required. In this paper, an innovative algorithm for directional earth fault detection, e.g. with an overhead line indicator, in compensated networks is presented. The algorithm is based on the switch-on process of an inductance and the DC component that occurs during this process. First, the physical background of the method is explained. The algorithm is simulated in the CIGRE MV Benchmark Network. Different scenarios are tested. The results of the simulations are successfully confirmed by real measurement data of a distribution network operator.