Short-Circuit Point Estimation Method for Distribution Lines Using Smart-Meters

Abstract

The presence of a substantial short-circuit current generates a large electromagnetic repulsive force. The energy of such a short-circuit current increases the likelihood of equipment damage. Furthermore, the occurrence of short-circuits disrupts the stable supply of electric power. When a short-circuit occurs in a distribution line, short-circuit point identification is realized based on information such as overcurrent indicators and equipment damage caused by the short-circuit. However, there is no established method for promptly pinpointing the short-circuit location. Therefore, this study proposes a short-circuit point estimation method for distribution lines using smart-meters; whose performance is anticipated to improve in the future. The proposed method involved using smart-meter voltage measurements to measure and determine the changes in the voltage drop slope, caused by the distribution-substation short-circuit currents and load currents, from the short-circuit location to the end point. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.