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Phase reversal occurs when a common-mode voltage, outside of the specified maximum range, causes the input stage to interact with the second stage causing an action that appears as if the input pins were reversed. This is sometimes accompanied by a significant increase in input bias current.
An electricity metering method and metering box
ActiveCN120993036BElectrical measurementsHarmonic reduction arrangementEnergy meteringControl engineering
This invention discloses a method and system for metering unsteady-state harmonic energy based on dynamic mirror extension, relating to the field of energy metering technology. The method extracts the instantaneous frequency of the unsteady-state harmonic signal through Hilbert transform, calculates the optimal reversal point spacing, and sets reversal points only at integer multiples of the optimal reversal point spacing. This solves the problem of phase reversal point distortion caused by the frequency variation of unsteady-state harmonic extrema in traditional mirror extension, effectively suppressing the endpoint effect, improving the signal-to-noise ratio of the extension segment, and enhancing the accuracy of energy metering.
Owner:ZHEJIANG GUANGLIANG ELECTRICAL CO LTD