Short‐Circuit Point Estimation Method Using Abnormal Detection Line of Distribution Line.

Short‐circuit accidents hinder the supply of electric power in distribution lines. If a short‐circuit occurs, the power supply is interrupted and can be resumed only after the short‐circuit point is repaired. Identifying the short‐circuit point is time consuming because it is necessary to confirm whether the overcurrent passage indicator is operating and visually confirm the short‐circuit point. Therefore, we propose a method of installing an abnormal detection line under the high‐voltage line and identifying the short‐circuit point based on the current ratio before and after the short‐circuit flowing to the current‐measuring devices installed at both ends of the abnormal detection line. Because the current flowing in a high‐voltage distribution line at the time of the short‐circuit depends on the short‐circuit resistance value, the range of application of the short‐circuit resistance value is also discussed. We show that the method using abnormal‐detection lines can be applied to estimate the high‐resistance ground faults and disconnection points, and the ability to estimate short‐circuit points leads to the efficient use of the method using abnormal detection lines. © 2022 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC. [ABSTRACT FROM AUTHOR]