G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 19/25 (2006.01) G01R 21/133 (2006.01)
Patent
CA 2160655
A digital monitor/analyzer for an ac electrical power system samples the current and voltage waveforms at a slow rate for performing metering functions, and at a high rate for analyzing harmonic content. Sampling is performed in sampling frames comprising a plurality of repetitions of sampling for a selected number of cycles followed by a delay of a fraction of a cycle. This effects equivalent sampling at a higher rate for slow speed sampling over a frame. High speed sampling is performed over only onerepetition of the selected number of cycles in a frame so that it can be carried out sychronously as required for the harmonic analysis. The high speed sampling rate is an integer multiple of the slow speed rate so that slow speed data can be extracted from the high speed samples for continuous metering. Fourier analysis of the harmonic content of the waveforms is performed on the odd interrupts while all of the other tasks are apportioned out over the even interrupts of a sampling frame. Both the odd and even interrupts initiate sampling.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Corporation Eaton
LandOfFree
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