Secondary arc extinction in AC/DC overhead lines
Résumé
This paper focuses on a specific issue related to hybrid AC / DC overhead transmission lines: the extinction of the secondary arc current of a faulted DC pole. A pole-to-ground fault leads to an opening of breakers to interrupt the short-circuit current. If the line is long, a small AC current (a few 10ths Amps) keeps on circulating in the fault due to the inductive and capacitive coupling between the AC circuit and the faulted pole. This current is named the secondary arc current. It may disappear after some time. However, if the pole is reclosed before its extinction, the fault starts again. This is studied through the paper with a sensitivity analysis of different secondary arc parameters. Calculations conducted with an Electromagnetic Transient Program show that the transposition of the AC circuit can significantly reduce the secondary arc current and then the dead time following a DC fault.
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