期刊名称：Journal of Theoretical and Applied Information Technology
印刷版ISSN：1992-8645
电子版ISSN：1817-3195
出版年度：2021
卷号：99
期号：20
语种：English
出版社：Journal of Theoretical and Applied
摘要：Short circuit disturbance in the electric power system, is the relationship between one voltage system and another directly connected system with a very small impedance. The direct connection results in the distribution of electric current at the fault point exceeding the nominal current. This situation has an impact on system instability, the system works in an unbalanced state and can damage equipment, if the disturbance is not neutralized (secured). The study of short circuit faults fundamentally consists of symmetrical faults and unsymmetrical faults (line to Ground Fault). In the simulation study, it is observed that three-phase symmetrical faults can be analyzed based on parametric data of the sub-switch reactance of the system, and one-phase asymmetrical faults to ground. Symmetrical fault analysis can be used as a reference in determining the breaker capacity, while for asymmetrical faults, L-G faults are implemented in determining the protection relay settings. The determination of the value of symmetrical and asymmetrical faults applies the analytical method of the Zbus model, carried out with system impedance data from the line diagram of the electric power system, then the system reactance data entry is carried out, then the symbolic notation of the connecting points is referred to as Bus. The number of buses will determine the number of orders of the bus impedance matrix (ZBUS). This ZBUS matrix becomes a reference in determining the value of short circuit impedance on each bus, by observing the diagonal of the ZBUS matrix. Calculations using the Matlab software tool, to determine the amount of fault current for each bus. From the data of 14 BUS-IEEE Power Systems, a trial was carried out for the fundamental study of the largest analysis results on buses 2, and from the characteristics of the comparison results, it can be seen that the value of the symmetrical fault current is greater than that of the non-symmetrical fault.
