This paper presents a comparison of secondary electric arcs behavior for reclosing applications. The main objective of the paper is to show the differences in secondary arcs during simulations, laboratory tests and real life events. These comparisons can help engineers develop adaptive reclosing algorithms and improve power system stability. A software arc model, a laboratory test result and field events' harmonic contents were analyzed. Although the harmonics may differ in each method, they all provide enough information to be used in the reclosing algorithms.

This study presents the results of single‐phase auto reclosing technique tests, comparing the performance of traditional procedure and fast adaptive procedure. The last is based on the measurement of voltage harmonic content on the transmission line faulty phase terminals. The transmission system used was modelled on the real‐time digital simulator with a distance relay and a quality meter to more realistically implement the reclosing techniques. The studied system was based on an actual Brazilian 500 kV transmission system. This study highlights the advantages of using the adaptive technique opposite to the use of traditional manoeuvre.

In this study, the main results of a new mitigation method to single‐phase auto‐reclosing switching in half‐wavelength transmission lines are presented. Initially, the behaviour of single‐phase reclosing on conventional lines was evaluated, then, the results obtained for half‐wavelength lines are presented. Finally, the proposed solution for the manoeuvre to be successfully executed is described. The study proposes a very advantageous solution for the application of the single‐phase switching in half‐wavelength lines.

This study presents an adaptive single‐phase reclosing method based on voltage harmonic measurement implemented in a digital harmonic filter. This filter and the transmission system were modelled in a real‐time digital simulator. A distance relay was used for protection and reclosing, responding as if it was in field operation. The studied system was based on an actual 500 kV Brazilian system. This study highlights the advantages of using the adaptive technique with a digital harmonic filter.