Apparatus and method for power disturbance analysis and storage
First Claim
1. A method of recording historical data to monitor an electrical power signal over a time period, the method comprising:
- (a) dividing the time period into a plurality of segment periods and into a plurality of disturbance periods, each consecutive pair of segment periods being separated by a respective one of the plurality of disturbance periods;
(b) generating a plurality of parameter values, at least one of the plurality of parameter values relating to one of the plurality of segment periods, the one of the plurality of parameter values characterizing the electrical power signal over the one of the plurality of segment periods;
(c) recording, during each of the plurality of disturbance periods, a plurality of samples of the electrical power signal; and
(d) storing the plurality of parameter values and the pluralities of samples to characterize the electrical power signal over the time period, the time period including the plurality of segment periods in addition to the plurality of disturbance periods.
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Abstract
A power monitoring system with associated signal processing and storage capabilities. Historical data for an electrical signal is retained and displayed by dividing the electrical signal in the time domain into segments herein referred to as events. A detected disturbance of the electrical signal forms a boundary between two events. For each such boundary, the steady-state value of a signal parameter such as root-mean-square (rms) voltage is stored for the two events delimited by the boundary. Samples of the electrical signal immediately surrounding the boundary are stored so that disturbances of interest can be closely inspected.
82 Citations
13 Claims
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1. A method of recording historical data to monitor an electrical power signal over a time period, the method comprising:
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(a) dividing the time period into a plurality of segment periods and into a plurality of disturbance periods, each consecutive pair of segment periods being separated by a respective one of the plurality of disturbance periods; (b) generating a plurality of parameter values, at least one of the plurality of parameter values relating to one of the plurality of segment periods, the one of the plurality of parameter values characterizing the electrical power signal over the one of the plurality of segment periods; (c) recording, during each of the plurality of disturbance periods, a plurality of samples of the electrical power signal; and (d) storing the plurality of parameter values and the pluralities of samples to characterize the electrical power signal over the time period, the time period including the plurality of segment periods in addition to the plurality of disturbance periods. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for recording historical data to monitor an electrical power signal over a time period, the apparatus comprising:
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a disturbance detector having the electrical power signal as an input over the time period, wherein the time period consists of a plurality of segment periods and a plurality of disturbance periods, each consecutive pair of segment periods being separated by a respective one of the plurality of disturbance periods, and the disturbance detector detecting the disturbance periods; a storage device; and a controller, coupled to the disturbance detector and to the storage device, for
1) storing in the storage device, a plurality of data samples for each of the disturbance periods; and
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2) storing in the storage device, for each segment period, a characteristic of the electrical power signal over the segment period, wherein historical data for the electrical power signal over each of the segment periods and each of the disturbance periods is retained by the apparatus. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification