Algorithm for Fault Distance Detection in 230 kV Transmission Line Through Oscillography Reading and Analysis with Wavelet Transform

Abstract

The aim of this paper is to present an alternative way of speeding up the analysis process for rewiring Transmission Lines (TLs) with reclosing restrictions due to intrusion. These intrusions occur in the right-of-way of these TLs, posing risks to the safety of third parties, with potential material and personal damage when these cables come loose. The impact of these LTs having a restriction on reclosing, based on LTs that are part of the basic grid, is the Variable Portion (PV), which consists of the discount on the monthly remuneration of these LTs for the transmission concessionaires, due to the unavailability of the transmission installation. To this end, an algorithm was developed for the approximate detection of the distance of the fault, even in high-impedance conditions, using the wavelet transform, taking the oscillography reading of just one terminal, facilitating analysis and decision-making as to whether or not the fault is in the intrusion range. To measure the algorithm's accuracy, a comparison was made with the ANÁLISE software which, in order to locate the point of the fault, compares the impedance of the TL with the impedance of the fault. In the simulations carried out with a single-phase fault and a fault impedance of 90 ohms, the technique used in the proposed algorithm achieved an average error of 3.86% compared to 59.21% for the impedance location technique.