Method and system for detecting phenomenon in electrical power network
AssigneeABB Schweiz AG
InventorJani Valtari
Life of this patent
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Abstract
A method for detecting a phenomenon in an electrical power network including at least one protection zone with at least two subzones. The method including measuring in the subzones of the protection zone at least one current signal actual in the respective subzone, determining linear dependency between the at least one measured current signal actual in at least one subzone of the protection zone and the corresponding at least one measured current signal actual in at least one another subzone of the protection zone, and detecting the phenomenon in the protection zone of the electrical power network based on the at least one determined linear dependency. Furthermore, a system for detecting a phenomenon in an electrical power network.
Claims8
A method for detecting a phenomenon in an electrical power network comprising at least one protection zone with at least two subzones, the method including measuring in the subzones of the protection zone at least one current signal actual in the respective subzone,
- determining linear dependencies between the at least one measured current signal actual in each subzone of the protection zone and the corresponding at least one measured current signal actual in each another subzone of the protection zone, and
- detecting the phenomenon in the protection zone of the electrical power network based on the determined linear dependencies, wherein the linear dependencies are determined by computing at least one correlation coefficient between the at least one measured current signal actual in each subzone of the protection zone and the corresponding at least one measured current signal actual in each another subzone of the protection zone,
- wherein the at least one computed correlation coefficient is compared with at least one limit value indicating a degree of linear dependency for detecting the phenomenon in the protection zone of the electrical power network,
- wherein in response to the at least one computed correlation coefficient indicating significant degree of linear dependency between corresponding current signals actual in at least two subzones of the protection zone the phenomenon having taken place in the protection zone of the electrical power network is detected,
- wherein the correlation coefficients indicating significant degree of linear dependency between corresponding current signals actual in at least two different subzones are compared for determining the subzone where the phenomenon has taken place and/or a type of the phenomenon, and
- wherein the phenomenon is a fault appearing in the galvanically interconnected electrical power network.
A system for detecting a phenomenon in an electrical power network comprising at least one protection zone with at least two subzones, the system including
- at least one measuring instrument for each subzone of the protection zone for measuring at least one current signal actual in the respective subzone,
- at least one intelligent electronic device configured to determine linear dependencies between the at least one measured current signal actual in each subzone of the protection zone and the corresponding at least one measured current signal actual in each another subzone of the protection zone, and
- the at least one intelligent electronic device configured to detect the phenomenon in the protection zone of the electrical power network based on the determined linear dependencies, wherein the linear dependencies are determined by computing at least one correlation coefficient between the at least one measured current signal actual in each subzone of the protection zone and the corresponding at least one measured current signal actual in each another subzone of the protection zone
- wherein the at least one intelligent electronic device is configured to compare the at least one computed correlation coefficient with at least one limit value indicating a degree of linear dependency for detecting the phenomenon in the protection zone of the electrical power network,
- wherein in response to the at least one computed correlation coefficient indicating significant degree of linear dependency between corresponding current signals actual in at least two subzones of the protection zone the at least one intelligent electronic device is configured to detect the phenomenon having taken place in the protection zone of the electrical power network,
- wherein the at least one intelligent electronic device is configured to compare the correlation coefficients indicating significant degree of linear dependency between corresponding current signals actual in at least two different subzones for determining the subzone where the phenomenon has taken place and/or a type of the phenomenon, and
- wherein the phenomenon is a fault appearing in the galvanically interconnected electrical power network.
Dependencies are inferred from the claim text.