Adaptação do método de Wiszniewski para agregar maiorexatidão à localização de faltas em linhas de transmissão com dados de um terminal

Abstract

Transmission line automatic fault location using data from only one terminal (local terminal) takes into consideration some simplifications to allow the estimation without data from other terminal (remote terminal). The use of these methods, when the fault has high fault resistance, generally produces estimative with inacceptable high errorsintended to practical localization. In this work, adaptations were developed for the transmission line automatic fault location method proposed by Wiszniewski, which uses data from only local terminal,enabling greater accuracy to fault location routine. These adaptations are mainly based on the reformulation of the originally proposed equations in order to consider transmission line capacitive effect and the estimationof the current contribution of each terminal to the fault current, being the contribution from remote terminal estimated by mean of a classic short-circuit program. These two adaptations, specially the use of voltage and current values of remote terminal obtained from a classic short-circuit program, proved their efficiency improving the fault location result, even in high fault resistance events, and when the topology ofreal system and the modeled inside the short-circuit program are not the strictly the same. The objective of this work is to present the proposed adaptations and the obtained results from ATP (Alternative Transient Program) simulated cases and also from some real cases from Brazilian electric power system, corroborating that the proposed adaptations can improve the performance of the method originally proposed by Wiszniewski. The obtained results demonstrate the efficiency of theproposed adaptations, since fault location errors were less than five percent when the proposed method was used, errors that are adequate to practical transmission line fault location tasks.