Detection and monitoring of partial discharge of a power line
First Claim
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1. A method comprising:
- acquiring a power spectrum of noise on a power line during a sweep of a range of frequencies,wherein said sweep is triggered with respect to a phase of a power voltage on said power line;
determining a characteristic of a spectral component of a spectrum of said power spectrum; and
determining a condition of said power line based on said characteristics,wherein said determining said characteristic comprises;
multiplying said power spectrum by a template waveform to yield a product waveform,wherein said template waveform has a period that corresponds to either of (a) a period of said power voltage, or (b) one half of said period of said power voltage; and
integrating said product waveform to yield a score, andwherein said score is indicative of said characteristic.
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Abstract
There is provided a method that includes (a) determining a characteristic of a fundamental spectral component of a spectrum of a power spectrum of noise on a power line, and (b) determining a condition of the power line based on the characteristic.
56 Citations
17 Claims
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1. A method comprising:
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acquiring a power spectrum of noise on a power line during a sweep of a range of frequencies, wherein said sweep is triggered with respect to a phase of a power voltage on said power line; determining a characteristic of a spectral component of a spectrum of said power spectrum; and determining a condition of said power line based on said characteristics, wherein said determining said characteristic comprises; multiplying said power spectrum by a template waveform to yield a product waveform, wherein said template waveform has a period that corresponds to either of (a) a period of said power voltage, or (b) one half of said period of said power voltage; and integrating said product waveform to yield a score, and wherein said score is indicative of said characteristic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method comprising:
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acquiring a power spectrum of noise on a power line during a sweep of a range of frequencies, wherein said sweep is triggered with respect to a phase of a power voltage on said power line; determining a characteristic of a spectral component of a spectrum of said power spectrum; and determining a condition of said power line based on said characteristic, wherein said determining said characteristic comprises; multiplying said power spectrum by a first template waveform to yield a first product waveform; integrating said first product waveform to yield a first score; multiplying said power spectrum by a second template waveform to yield a second product waveform; integrating said second product waveform to yield a second score; and selecting a greater of said first score or said second score, to yield a resultant score, and wherein said resultant score is indicative of said characteristic. - View Dependent Claims (14)
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15. A method comprising:
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acquiring a power spectrum of noise on a power line during a sweep of a range of frequencies, wherein said sweep is triggered with respect to a phase of a power voltage on said power line; determining a characteristic of a spectral component of a spectrum of said power spectrum; and determining a condition of said power line based on said characteristic, wherein said determining said characteristic comprises; multiplying said power spectrum by a template waveform to yield a first product waveform, wherein said template waveform is periodic, and wherein said multiplying is performed using a first phase relationship between said template waveform and said power spectrum; integrating said first product waveform to yield a first score; multiplying said power spectrum by said template waveform using a second phase relationship between said template waveform and said power spectrum, to yield a second product waveform; integrating said second product waveform to yield a second score; and selecting a greater of said first score or said second score, to yield a resultant score, and wherein said resultant score is indicative of said characteristic.
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16. A method comprising:
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acquiring a power spectrum of noise on a power line during a sweep of a range of frequencies, wherein said sweep is triggered with respect to a phase of a power voltage on said power line; determining a characteristic of a spectral component of a spectrum of said power spectrum; and determining a condition of said power line based on said characteristic, wherein said determining said characteristic comprises; multiplying said power spectrum by a template waveform to yield a first product waveform, wherein said template waveform has a period that corresponds to a period of said power voltage, and wherein said multiplying is performed with said template waveform being substantially in-phase with said power spectrum; integrating said first product waveform to yield a first score; multiplying said power spectrum by said template waveform with said template waveform being shifted by 180 degrees, to yield a second product waveform; integrating said second product waveform to yield a second score; and calculating a ratio of said first score and said second score, and wherein said ratio is indicative of said characteristic.
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17. A system comprising:
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a device that acquires a power spectrum of noise on a power line during a sweep of a range of frequencies, wherein said sweep is triggered with respect to a phase of a power voltage on said power line; and a processor that; (a) determines a characteristic of a spectral component of a spectrum of said power spectrum; and (b) determines a condition of said power line based on said characteristic, wherein said determining said characteristic comprises; multiplying said power spectrum by a template waveform to yield a product waveform, wherein said template waveform has a period that corresponds to either of (a) a period of said power voltage, or (b) one half of said period of said power voltage; and integrating said product waveform to yield a score, and wherein said score is indicative of said characteristic.
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Specification