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US 6,724,597 B1Granted
Protection device for low voltage networks
AssigneeSiemens Aktiengesellschaft
InventorsWerner Elischer, Gerd Griepentrog, Reinhard Maier, Erich Zerbian
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Abstract
A protection device includes a measurement device that is a current transformer which is based on a printed circuit, and an evaluation device that is a unit for early short-circuit identification. The current transformer, which is based on a as printed circuit board, is preferably a multiwinding transformer. The unit for early short-circuit identification operates on the basis of a so-called locus curve method, which uses instantaneous values of the current and current rate of change to identify a short circuit.
Claims10
A protection device for low-voltage networks, comprising:
- a measurement device, including a current transformer, for determining instantaneous values of a current and a current rate of change and
- an evaluation device which acts as a unit for early short-circuit identification, and which uses the instantaneous values of the current and the current rate of change to identify a short-circuit, wherein the current transformer is a multiwinding transformer based on a printed circuit board including at least two secondary windings with signals for the current and for the current rate of change being determined from the at least two secondary windings.
Dependencies are inferred from the claim text.