Current limiter device
AssigneeAsea Brown Boveri AG
InventorTudor Baiatu
Life of this patent
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Abstract
A reversible short circuit current limiter which has at least one PTC thermistor connected in parallel with a shunt impedance branch, and is connected in series with at least one capacitor or a capacitor bank of the DC intermediate circuit. The short circuit current limiter may be arranged in the DC intermediate circuit or in the current convertor. A diode may be connected in the reverse-bias direction of a short circuit path in parallel with the PTC thermistor. The shunt impedance branch has a varistor connected in series with an ohmic resistor or a PTC thermistor and, if appropriate, an inductor. Structures of metal-based nonblocking PTC thermistors are specified.
Claims15
A current limiter device, comprising:
- at least one PTC thermistor in a first circuit branch;
- at least one varistor in a second circuit branch electrically connected in parallel with the first circuit branch;
- and
- at least one electrical impedance connected in the second circuit branch in series with the at least one varistor, wherein the at least one PTC thermistor has at least one resistive track of a material with a positive temperature coefficient, which is thermally conductively connected to at least one cooling element, the at least one resistive track having a first surface thermally connected by an electrically insulating, thermally conductive insulation layer to the at least one cooling element, and a second surface connected to a flexible high-temperature stable polymer film.
Dependencies are inferred from the claim text.