Double interpolation anti-skew compensation of sampled analog da

Details Double interpolation anti-skew compensation of sampled analog da Double interpolation anti-skew compensation of sampled analog da

1998-03-02

2000-09-05

Hoff, Marc S.

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

702 58, 702106, 702126, 324 7624, 324 7629, 324 7647, G06F 1900, G01R 3100

Patent

active

061156752

ABSTRACT:
A protective relay system comprises current and voltage transducers 10, filters 12, and a multiplexor 14, the latter outputting an interleaved stream of analog phase current and voltage signal samples, as well as neutral current samples. The analog multiplex output by the multiplexor 14 is digitized by an analog-to-digital converter 16. The output of the analog-to-digital converter 16 is fed to a digital signal processing block 18. The multiplexor necessarily introduces a time-skew between the successive samples for each channel and also introduces a time-skew between the respective channels. The system corrects the sample-to-sample time-skew for each channel, and then derives current and voltage phasors from the time-skew corrected data.

REFERENCES:
patent: 4547726 (1985-10-01), Premerlani
patent: 4715000 (1987-12-01), Premerlani
patent: 4723216 (1988-02-01), Premerlani
patent: 5428549 (1995-06-01), Chen
patent: 5477163 (1995-12-01), Kliman
patent: 5514978 (1996-05-01), Koegl et al.
patent: 5517106 (1996-05-01), Longini

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