Fault location in distribution systems with DG based on similarity of fault impedance

Abstract

This paper presents a new method for locating a fault in distribution systems using the similarity of fault impedance. A four-step approach is proposed to locate the fault in the networks. First, pre-and during-fault voltages from smart feeders along the primary feeders are measured. Second, three-phase impedance to calculate fault current corresponding to voltage deviation from each smart meter is achieved. Third, a relation between fault current and fault impedance for each type of fault is extracted. Finally, based on the similarity of the estimated fault impedance for each bus, an error index is calculated. Moreover, an auxiliary process is utilized to analyze the estimated fault impedance. The proposed method uses both smart meters and phasor measurement units to obtain voltage sag. Distributed generation and loads are modeled as constant impedances and then they are considered in the three-phase impedance matrix. The suggested approach is evaluated in the IEEE 34-bus test distribution network, which is simulated in the PSCAD/EMTDC environment. The obtained numerical results confirm the acceptable accuracy of the proposed methodology for all types of faults with various fault resistances.

New Fault-Location Algorithm for Series-Compensated Double-Circuit Transmission Line

“…To determine the faulted location of transmission lines, several fault-location algorithms are proposed [2][3][4][5][6][7][8][9][10][11][12]. These algorithms can be divided into two categories.…”

“…These algorithms can be divided into two categories. In the first category, single-terminal voltage and current are used in fault-location algorithm [2][3][4][5][6]. In these algorithms, it may be difficult to accurately determine the locations of the faults, since these algorithms are usually valid under approximate assumptions, in the absence of data from the other terminal, existing algorithms generally have accuracy problems.…”

Dynamic Fault Classification and Location in Distribution Networks

“…The steps performed by the digital relay for fault detection, classication and localization.The currents and voltage signals are ltered using the antialiasing lter (Butterworth lowpass) and sampled at 1 kHz 4…”