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Switching arc diagnostics in DC contactor
Píška, Jakub ; Kloc, Petr (oponent) ; Valenta, Jiří (vedoucí práce)
The goal of this master's thesis was to carry out middle voltage DC contactor diagnostics with a focus on back-commutation and sticking, to propose and test alterations which would remove these negative phenomena. The arc voltage, fast camera and pressure measurements were used to determine these effects. Changes to arcrunners and pole plates of the magnetic circuit were used to limit them. The proposed alterations limited the time delay caused by back-commutation and thus shortened the arc transfer time.
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Back-Commutation And Sticking Reduction Methods In Dc Contactor
Piska, Jakub
The back-commutation and sticking are phenomena which cause an increase in time delaybetween arc ignition and arc reaching the arc chute. These effects cause increase in total switchingtime and contact and arc runner wear. This paper gives a comparison of several approaches to reductionof these effects in a medium voltage contactor for traction usage. The three chosen approacheswere: changes of the shape of the arcrunners, changes of the pole plates of the magnetic circuit andincrease of the ventilation cross section. Metrics on how to compare the performance of these differentalterations were given, based on switching times. From the three tested methods the ventilationincrease yielded the best results as it both reduced the switching time and time delay caused by theback-commutation and reduced the variation of these characteristics.
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Switching arc diagnostics in DC contactor
Píška, Jakub ; Kloc, Petr (oponent) ; Valenta, Jiří (vedoucí práce)
The goal of this master's thesis was to carry out middle voltage DC contactor diagnostics with a focus on back-commutation and sticking, to propose and test alterations which would remove these negative phenomena. The arc voltage, fast camera and pressure measurements were used to determine these effects. Changes to arcrunners and pole plates of the magnetic circuit were used to limit them. The proposed alterations limited the time delay caused by back-commutation and thus shortened the arc transfer time.
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