System and method for determining the impedance of a medium voltage power line
First Claim
1. A method of determining an impedance of a medium voltage power line having a finite characteristic impedance, comprising:
- determining a first voltage comprising the voltage of the power line at a first location at a first time;
determining a second voltage comprising the voltage of the power line at a second location at the first time;
determining a first current comprising the current flowing between the first location and the second location of the power line at the first time;
determining a third voltage comprising the voltage of the power line at the first location at a second time;
determining a fourth voltage comprising the voltage of the power line at the second location at the second time;
determining a second current comprising the current flowing between the first location and the second location of the power line at the second time;
determining a first voltage change comprising the difference between the first voltage and the third voltage;
determining a second voltage change comprising the difference between the second voltage and the fourth voltage;
determining a current change comprising the difference between the first current and the second current;
determining the impedance by dividing the difference between the first voltage change and the second voltage change by the current change; and
outputting data of the determined impedance.
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Abstract
A system and method of detecting changes in the impedance of a segment of medium voltage power line is provided. In one embodiment, the method comprises receiving voltage data comprising data of the voltage of the power lines at locations at a plurality of different points in time, receiving current data that comprises data of the current flowing between adjacent locations at the plurality of points in time, intermittently determining an impedance of the power lines between adjacent locations based on the voltage data and current data, monitoring the impedance of the power lines between adjacent locations over time, and providing a notification of a change in the impedance of a power line between adjacent locations upon detection of a change in the impedance beyond a threshold change.
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Citations
19 Claims
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1. A method of determining an impedance of a medium voltage power line having a finite characteristic impedance, comprising:
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determining a first voltage comprising the voltage of the power line at a first location at a first time; determining a second voltage comprising the voltage of the power line at a second location at the first time; determining a first current comprising the current flowing between the first location and the second location of the power line at the first time; determining a third voltage comprising the voltage of the power line at the first location at a second time; determining a fourth voltage comprising the voltage of the power line at the second location at the second time; determining a second current comprising the current flowing between the first location and the second location of the power line at the second time; determining a first voltage change comprising the difference between the first voltage and the third voltage; determining a second voltage change comprising the difference between the second voltage and the fourth voltage; determining a current change comprising the difference between the first current and the second current; determining the impedance by dividing the difference between the first voltage change and the second voltage change by the current change; and outputting data of the determined impedance. - View Dependent Claims (2)
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3. A method of determining an impedance of a medium voltage power line having a finite characteristic impedance, comprising:
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determining a first voltage change comprising data of a change in a voltage at a first location of the power line between a first time and a second time; determining a second voltage change comprising data of a change in a voltage at a second location of the power line between the first time and the second time; determining a current change comprising a change in the current flowing between the first location and the second location of the power line between the first time and the second time; determining the impedance by dividing the difference between the first voltage change and the second voltage change by the current change; and outputting data of the determined impedance. - View Dependent Claims (4, 5, 6)
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7. A method of determining an impedance of a medium voltage power line having a finite characteristic impedance, comprising:
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a. receiving, from a first device, first voltage data comprising data of the voltage of the power line at a first location at a first time; b. receiving, from a second device, second voltage data comprising data of the voltage of the power line at a second location at the first time; c. receiving first current data comprising data of the current flowing between the first location and the second location of the power line at the first time; d. receiving, from the first device, third voltage data comprising data of the voltage of the power line at the first location at a second time; e. receiving, from the second device, fourth voltage data comprising data of the voltage of the power line at the second location at the second time; f. receiving second current data comprising data of the current flowing between the first location and the second location of the power line at the second time; g. determining a first voltage change that comprises a difference between the first voltage data and the third voltage data; h. determining a second voltage change that comprises a difference between the second voltage data and the fourth voltage data; i. determining a current change that comprises a difference between the first current data and the second current data; j. determining an impedance of the power line between the first location and the second location by dividing the difference between the first voltage change and the second voltage change by the current change; and outputting data of the determined impedance. - View Dependent Claims (8, 9)
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10. A method of detecting changes in an impedance of a plurality of medium voltage power lines, each having a finite characteristic impedance, comprising:
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receiving voltage data comprising data of the voltage of the power lines at each of a plurality of locations at a plurality of different points in time; receiving current data comprising data of the current flowing between adjacent locations of the plurality of locations at each of the plurality of points in time; repeatedly determining the impedance of the power lines between each of the plurality of adjacent; detecting a change in the impedance of the power lines between one or more of the plurality of adjacent locations; providing a notification of the detection of the one or more changes in impedance; and wherein said determining the impedance of the rower lines between each of the plurality of adjacent locations comprises; determining a voltage change at each location over time; determining a current change comprising a change in the current flowing between adjacent locations over time; and dividing a difference between the voltage changes of adjacent locations by the current change between the adjacent locations. - View Dependent Claims (11, 12)
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13. A method of detecting changes in the impedance of a plurality of medium voltage power lines, each having a finite characteristic impedance, comprising:
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receiving voltage data comprising data of the voltage of the power lines at each of a plurality of locations at a plurality of different points in time; receiving current data comprising data of the current flowing between adjacent locations of the plurality of locations at the plurality of points in time; repeatedly determining information of an impedance of the power lines between a plurality of adjacent locations based on the voltage data and current data; detecting a change in the impedance of a power line between adjacent locations; providing a notification of a change in the impedance of a power line between adjacent locations upon detection of a change in the information of the impedance beyond a threshold change; and wherein said determining information of the impedance of the rower lines comprises; determining a voltage change at each location over time; determining a current change comprising a change in the current flowing between adjacent locations over time; and dividing a difference between the voltage changes of adjacent locations by the current change between the adjacent locations. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification