Digital power metering

Details Digital power metering Digital power metering

G - Physics

01

R

324/70

G01R 21/133 (2006.01)

Patent

CA 1290400

DIGITAL POWER METERING ABSTRACT OF THE DISCLOSURE Method and apparatus for metering polyphase power sources in which cycles for each phase are sampled at each degree and converted to a binary representation of amplitude. Sampling commences with a zero cross-over and a first digital conversion provides range data for developing scaling factors which are retained in memory and for providing a selective gain for amplifying the same sampled degree and obtaining a second, range digital conversion. The scaling factor and the range data then are multiplied to develop a digital representation of the sample amplitude which may have as many as 21 significant bits plus a sign bit. These expanded data valuations for current and voltage then are selectively multiplied for such degree sampled to develop data available for generation of 12 electrical parameter outputs. Generally, six of these outputs will be elected by the user. Volt amperes are computed with respect to the zero cross-over events for both voltage and current samples, while quantities such as Q and var are developed by selective delayed multiplication of the unit degree samples.

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