Fault location in a non-homogeneous electric power line
First Claim
1. A method for determining a location of a fault on a non-homogeneous electric power line with a plurality of sections, the method comprising:
- calculating, using a fault locator device configured to interface with an electric power distribution system, a first profile of a power system quantity using measurements from a first terminal of the electric power line by calculating a plurality of negative-sequence voltage magnitudes at the left side and a plurality of negative-sequence voltage magnitudes at the right side of each section from measurements from the first terminal;
calculating using the fault locator device a second profile of the power system quantity using measurements from a second terminal of the electric power line by calculating a plurality of negative-sequence voltage magnitudes at the left side and a plurality of negative-sequence voltage magnitudes at the right side of each section from measurements from the second terminal; and
calculating using the fault locator device a fault location by determining a point at which the first profile is closest to the second profile.
2 Assignments
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Accused Products
Abstract
Fault location on a non-homogeneous electric power line that includes a plurality of sections by determining a section in which negative-sequence voltage magnitude profiles calculated from each terminal of the power line intersect. The fault location may determine the faulted section and determine the location of the fault within the faulted section. To determine the fault location, the negative-sequence voltage magnitude profiles may be calculated from measurements taken at each terminal of the power line and compared to determine a point where the profiles intersect. The profiles may be calculated using power line properties and measurements from each terminal.
74 Citations
39 Claims
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1. A method for determining a location of a fault on a non-homogeneous electric power line with a plurality of sections, the method comprising:
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calculating, using a fault locator device configured to interface with an electric power distribution system, a first profile of a power system quantity using measurements from a first terminal of the electric power line by calculating a plurality of negative-sequence voltage magnitudes at the left side and a plurality of negative-sequence voltage magnitudes at the right side of each section from measurements from the first terminal; calculating using the fault locator device a second profile of the power system quantity using measurements from a second terminal of the electric power line by calculating a plurality of negative-sequence voltage magnitudes at the left side and a plurality of negative-sequence voltage magnitudes at the right side of each section from measurements from the second terminal; and calculating using the fault locator device a fault location by determining a point at which the first profile is closest to the second profile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system for determining a location of a fault on a non-homogeneous electric power line with a first terminal, a second terminal, and a plurality of sections therebetween, the system comprising:
a fault locator comprising; an input for receiving electric power line information from the first terminal and electric power line information from the second terminal; a memory comprising a representation of a physical property for each of the plurality of sections, the physical property distinguishing at least one of the plurality of sections from at least one other section; a processor for executing computer instructions; a fault calculation module executable on the processor and using the physical properties for each of the plurality of sections, the electric power line information from the first terminal, and the electric power line information from the second terminal to create a first profile from measurements from the first terminal and a second profile from measurements from the second terminal and using the first and second profiles to determine the location of the fault. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A method for determining a location of a fault on a non-homogeneous electric power line with a plurality of sections, the method comprising:
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in a fault locator device configured to interface with an electric power distribution system, determining a faulted section by; calculating a negative-sequence voltage magnitude at the left and right sides of each section from a first plurality of measurements from a first terminal of the electric power line, the first plurality of measurements representing electrical parameters received by the fault locator device; calculating a negative-sequence voltage magnitude at the left and right side of each section from a second plurality of measurements from a second terminal of the electric power line, the second plurality of measurements representing electrical parameters received by the fault locator device; and the fault locator device determining the section in which, the negative-sequence voltage magnitude at the left side of the section calculated from measurements from the first terminal is less than or equal to the negative-sequence voltage magnitude at the left side of the section calculated from the measurements from the second terminal, and the negative-sequence voltage magnitude at the right side of the section calculated from measurements from the second terminal is less than or equal to the negative-sequence voltage magnitude at the right side of the section calculated from the measurements from the first terminal; and the fault locator device determining the location of the fault within the faulted section.
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39. A method for determining a location of a fault on a non-homogeneous electric power line with a first terminal, a second terminal, and a plurality of sections therebetween using a fault locator device, the method comprising:
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receiving electric power line information from the first terminal and electric power line information from the second terminal; storing a representation of a physical property for each of the plurality of sections in a non-transitory computer-readable storage medium associated with the fault locator device, the physical property distinguishing at least one of the plurality of sections from at least one other section; creating a first profile using the fault locator device based on measurements from the first terminal using the physical properties for each of the plurality of sections, the electric power line information from the first terminal, and the electric power line information from the second terminal; creating a second profile using the fault locator device based on measurements from the second terminal using the physical properties for each of the plurality of sections, the electric power line information from the first terminal, and the electric power line information from the second terminal; and determining the location of the fault using the fault locator device and based on the first and second profiles.
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Specification