A Study of Symmetrical and Unsymmetrical Short Circuit Fault Analyses in Power Systems

Abstract

In this study, the common symmetrical and unsymmetrical short circuit faults in power systems are analyzed detailed. Unlike the similar studies in the literature, metallic fault conditions for unsymmetrical faults are also given in the paper additionally. For this aim, a short circuit analysis algorithm is created for the analysis of both three phase short circuit, line-to-line short circuit with fault impedance, metallic line-to-line short circuit, double line-to-ground short circuit with fault impedance, metallic double line-to-ground short circuit, line-to-ground short circuit with fault impedance and metallic line-to-ground short circuit. The obtained algorithm is established as software in MATLAB. The algorithm is applied on a sample power test system and the results are given.

Power System Fault Detection and Analysis of Distribution Line from Utility Perspective

“…Line to Line fault is a short circuit condition between any two phases of a system. L-L faults are the second most common minor distribution system faults, with a percentage of 8%-10% [7], [25], [26]. Lineto-line (L-L) fault in a three-phase power system can be expressed in phasor form as follows:…”

A Symmetrical-Asymmetrical Fault Characteristics Analysis within Cogeneration Power Plant in Izmir, Turkey: An Experimental Assessment

“…When a short circuit occurs, the all considered internal impedance replaces components and an equivalent voltage source is implemented at the fault node the equivalent short-circuits impedance of the system electrical system. Faults are generally divided into two broad categories in today's power systems [19];  Symmetrical or balanced faults (three phase)  Asymmetrical or unbalanced faults.…”

“…In the literature, there are many studies that showed the changes in current and voltage during short circuit which bases on the basis of power system design. Some authors used for demonstrating fault simulation studies and analyses on the IEEE-9 bus [16][17][18], IEEE-14 bus [19] and 39-bus New England System [18], while other authors examined modeled real data based on which are substation in Turkey [20], substation in India [21], wind power plant [17], nuclear power plant [22]. There are many software in the literature that are widely used to perform short circuit analysis, which are Matlab [16,19,20,23], PSCAD [24], Power World Simulator [25,26], ETAP [17,18,21,27] and DigSilent [22,28].…”

“…Some authors used for demonstrating fault simulation studies and analyses on the IEEE-9 bus [16][17][18], IEEE-14 bus [19] and 39-bus New England System [18], while other authors examined modeled real data based on which are substation in Turkey [20], substation in India [21], wind power plant [17], nuclear power plant [22]. There are many software in the literature that are widely used to perform short circuit analysis, which are Matlab [16,19,20,23], PSCAD [24], Power World Simulator [25,26], ETAP [17,18,21,27] and DigSilent [22,28]. As a result of calculating short circuit currents, there are studies for the selection of the protection equipment and determination of the coordination scheme of the protection equipment.…”

The Impact of the Power Transformer Connections on the Flow of Zero Sequence Current

“…The DLG through metallic or a fault impedance are unsymmetrical or unbalanced faults that create severe unbalanced operating conditions. The SLG and DLG faults can be analyzed into three symmetrical components which are three balanced sets (positive, negative, and zero circuits) [8,9].…”