Device for detecting voltage disturbance
First Claim
1. A method for judging occurrence of voltage disturbance, comprising:
- storing digitized point values of a voltage reference waveform;
detecting actual voltage values and converting, by digitization, the actual voltage values into point values of the actual voltage which are in one-to-one correspondence with the stored digitized point values of the reference waveform;
comparing the point values of the actual voltage values with the corresponding point values of the reference waveform; and
judging occurrence of a voltage disturbance if, for N successive points, differences between said point values of the actual voltage and said point values of the reference waveform, obtained from the comparison, are all greater than a disturbance threshold, wherein N is an integer greater than 0.
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Abstract
At least one embodiment of the present invention provides a method for detecting voltage disturbance. In at least one embodiment the method includes storing the digitized point values of a voltage reference waveform; detecting actual voltage values, and converting the actual voltage values by digitization into point values of the actual voltage which are in one-to-one correspondence with the point values of the reference waveform; comparing the point values of the actual voltage with the corresponding point values of the reference waveform; judging that a voltage disturbance occurs if, for N successive points, the differences between the point values of the actual voltage and the corresponding point values of the reference waveform are all greater than a predetermined disturbance threshold, wherein N is an integer greater than 0. A technical solution of at least one embodiment of the present invention improves the response speed of the detection, and shortens the response time. At least one embodiment of the present invention also provides a voltage disturbance detecting device for applying the method for detecting voltage disturbance.
10 Citations
18 Claims
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1. A method for judging occurrence of voltage disturbance, comprising:
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storing digitized point values of a voltage reference waveform; detecting actual voltage values and converting, by digitization, the actual voltage values into point values of the actual voltage which are in one-to-one correspondence with the stored digitized point values of the reference waveform; comparing the point values of the actual voltage values with the corresponding point values of the reference waveform; and judging occurrence of a voltage disturbance if, for N successive points, differences between said point values of the actual voltage and said point values of the reference waveform, obtained from the comparison, are all greater than a disturbance threshold, wherein N is an integer greater than 0. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 18)
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13. A device for judging occurrence of a voltage disturbance, comprising:
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a reference waveform storage unit, to store digitized point values of a reference waveform; a voltage detection unit, to detect actual voltage values, and to convert by digitization the actual voltage values into point values of the actual voltage which are in one-to-one correspondence with the stored digitized point values of the reference waveform; a point value comparison unit, to compare the point values of the actual voltage obtained from said voltage detection unit with the corresponding point values of the reference waveform obtained from said reference waveform storage unit; and a disturbance judgment unit, to obtain comparison results of the point value comparison unit, and to judge occurrence of a voltage disturbance, for N successive points, a differences between the point values of the actual voltage and said corresponding point values of the reference waveform, obtained from the comparison, are all greater than a disturbance threshold, wherein N is an integer greater than 0. - View Dependent Claims (14, 15, 16)
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17. A device for judging occurrence of a voltage disturbance, comprising:
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means for storing digitized point values of a voltage reference waveform; means for detecting actual voltage values and converting, by digitization, the actual voltage values into point values of the actual voltage which are in one-to-one correspondence with the stored digitized point values of the reference waveform; means for comparing the point values of the actual voltage values with the corresponding point values of the reference waveform; and means for judging occurrence of a voltage disturbance if, for N successive points, differences between said point values of the actual voltage and said point values of the reference waveform, obtained from the comparison, are all greater than a disturbance threshold, wherein N is an integer greater than 0.
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Specification