Systems and methods for characterizing fault clearing devices
First Claim
1. A computer implemented method for characterizing a device that operated to clear a fault in a power distribution system feeder, the method comprising:
- measuring, by an Intelligent Electronic Device (IED) connected to the feeder, a current along the feeder proximate a substation bus;
sending measured data corresponding to the measured current to at least one computer processor; and
receiving from the at least one computer processor a most probable device size for the device that operated to clear the fault, wherein the at least one computer processor is configured to;
determine from the measured data that the fault has occurred in at least one phase and has been cleared;
subtract reference data from the measured data to estimate residual fault data;
after the device operated to clear the fault, estimate from the residual fault data an operating point for the device that operated to clear the fault;
calculate density functions for a plurality of device sizes;
calculate for the operating point a proximity measure for each of the plurality of device sizes; and
identify the one of the plurality of device sizes corresponding to the smallest proximity measure as the most probable device size for the device that operated to clear the fault.
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Accused Products
Abstract
Systems and methods for characterizing a device that operated to clear a fault in a power line, such as a power distribution system feeder, are disclosed. Characterizing the device may include receiving measured data corresponding to a current measured along the feeder proximate a substation bus, determining from the measured data that a fault has occurred in at least one phase and has been cleared, subtracting reference data from the measured data to estimate residual fault data, and estimating from the residual fault data a characteristic of the device that operated to clear the fault. The systems may include an Intelligent Electronic Device (IED) and a processor linked to the IED.
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Citations
23 Claims
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1. A computer implemented method for characterizing a device that operated to clear a fault in a power distribution system feeder, the method comprising:
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measuring, by an Intelligent Electronic Device (IED) connected to the feeder, a current along the feeder proximate a substation bus; sending measured data corresponding to the measured current to at least one computer processor; and receiving from the at least one computer processor a most probable device size for the device that operated to clear the fault, wherein the at least one computer processor is configured to; determine from the measured data that the fault has occurred in at least one phase and has been cleared; subtract reference data from the measured data to estimate residual fault data; after the device operated to clear the fault, estimate from the residual fault data an operating point for the device that operated to clear the fault; calculate density functions for a plurality of device sizes; calculate for the operating point a proximity measure for each of the plurality of device sizes; and identify the one of the plurality of device sizes corresponding to the smallest proximity measure as the most probable device size for the device that operated to clear the fault. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A computer implemented method for characterizing a device that operated to clear a fault in a power distribution system feeder, the method comprising at:
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measuring, by an Intelligent Electronic Device (IED) connected to the feeder, a current along the feeder proximate a substation bus; sending measured data corresponding to the measured current to at least one computer processor; and receiving from the at least one computer processor an estimate for a device size of the device that operated to clear the fault, wherein the at least one computer processor is configured to; determine from the measured data that the fault has occurred in at least one phase and has been cleared; subtract reference data from the measured data to estimate residual fault data, wherein the residual fault data approximates fault current passed through the device; estimate from the residual fault data a clearing time for the fault and a characteristic of the device that operated to clear the fault, wherein the characteristic of the device that operated to clear the fault is the device size, the clearing time and the approximated fault current together define an operating point for the device that operated to clear the fault; provide a set of minimum melt time curves for a set of candidate device sizes; calculate a set of modeled parameters, wherein each of the modeled parameters is calculated from one of the set of minimum melt time curves; calculate an operating parameter from the operating point for the device that operated to clear the fault; determine a largest one of the set of modeled parameters that is not greater than the operating parameter; and identify the one of the set of candidate device sizes corresponding to the determined largest one of the set of modeled parameters as the estimate for the device size of the device that operated to clear the fault.
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12. A computer implemented method for characterizing a device that operated to clear a fault in a power distribution system feeder, wherein the feeder includes phases a, b and c, the method comprising:
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measuring, by an Intelligent Electronic Device (IED) connected to the feeder, a current along the feeder proximate a substation bus; sending measured data corresponding to the measured current to at least one computer processor; and receiving from the at least one computer processor a number of most-affected phases NPh, wherein the at least one computer processor is configured to; determine from the measured data that the fault has occurred in at least one phase and has been cleared; subtract reference data from the measured data to estimate residual fault data; after the device operated to clear the fault, estimate from the residual fault data a characteristic of the device that operated to clear the fault; and determine a number of most-affected phases NPh from; - View Dependent Claims (13)
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14. A non-transitory computer readable storage medium having embodied thereon a plurality of machine-readable instructions configured to be executed by a computer processor to characterize an interrupting device that has operated to clear a fault, the plurality of machine-readable instructions comprising instructions to:
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measure a current along a feeder proximate a substation bus, wherein the signal is measured by an Intelligent Electronic Device (IED); receive measured data corresponding to the measured current; determine from the measured data that a fault has occurred in at least one phase of the feeder and has been cleared; subtract reference data from the measured data to estimate residual fault data; estimate from the residual fault data an operating point for the device that operated to clear the fault; calculate density functions for a plurality of device sizes; calculate for the operating point a proximity measure for each of the plurality of device sizes; and identify the one of the plurality of device sizes corresponding to the smallest proximity measure as a most probable device size for the device that operated to clear the fault. - View Dependent Claims (15, 16, 17, 18)
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19. A system for characterizing a device that has operated to clear a fault, the system comprising:
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an Intelligent Electronic Device (IED) connected to a feeder and configured to measure current along the feeder proximate a substation bus; and a processor linked to the IED and configured to execute instructions to perform a method comprising; determining from the measured current that a fault has occurred in at least one phase and has been cleared; subtracting a reference current from the measured current to estimate a fault current passed through the device; after the device operated to clear the fault, estimating from the fault current an operating point for the device that operated to clear the fault; calculating density functions for a plurality of device sizes; calculating for the estimated operating point a proximity measure for each of the plurality of device sizes; and identifying the one of the plurality of device sizes corresponding to the smallest proximity measure as a most probable device size for the device that operated to clear the fault. - View Dependent Claims (20, 21, 22, 23)
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Specification