Abstract
AbstractReliability of protection and apparatus selection of the electrical power systems depend on the correct and accurate calculation of short‐circuit currents. The simulation of the electrical power systems is one of the methods that is used for the determination of the short‐circuit currents. In this paper, the model of the electrical power system has been represented by a system of differential equations for current determination. These differential equations have been expressed in Cartesian system of coordinates that decreased the number of the equations by one‐third. This paper compares two approaches of short‐circuit simulation in electrical power systems and evaluates the error in the calculated short‐circuit current during both transient and steady‐state conditions. These approaches are as follows: first, the replacement of the load parameters by zero and second, the introduction of fault simulation switch. A fault has been simulated in a study electrical power system and the factors on which the error depends have been determined. In this paper, the envelope of the short‐circuit current has been considered as a comparative criterion. Copyright © 2008 John Wiley & Sons, Ltd.
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