Device for detecting the short circuiting of the switches of a converter circuit arrangement
AssigneeAsea Brown Boveri AG
InventorRobert Schilling
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Abstract
A device for detecting the short circuiting of the switches of a converter circuit arrangement is disclosed. The device is magnetically coupled to the current limiter coil and comprises a conductor loop which is preferably arranged at the end of the current limiter coil. On short circuiting, a voltage is induced in the conductor loop. This voltage is converted in a detection circuit into a voltage pulse and fed to an evaluation logic circuit. In the evaluation logic circuit, the period of the induced voltage pulse is evaluated and, if appropriate, load-relieval actuation is initiated.
Claims13
A device for detecting a short circuiting of at least one of a plurality of switches (3) of a converter circuit arrangement (1) having at least one branch (2) with the plurality of switches (3), said branch (2) being connected to at least one of a DC voltage intermediate circuit and a direct current intermediate circuit (4), respective of the plurality of switches (3) corresponding to said branch (2) being protected from excessively steep current edges by a current limiter coil (Lb) connected in series with respective of the switches (3), wherein the device being magnetically coupled to the current limiter coil (Lb), and wherein the device further comprises means (5, 6) for detecting a voltage induced in the current limiter coil (Lb) when a short circuit failure occurs in a respective one of the switches (3).
Dependencies are inferred from the claim text.