Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means
Patent
1996-01-31
1997-07-29
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With coupling means
324117R, 323356, G01R 1910
Patent
active
056525079
ABSTRACT:
The dynamic range of a current transformer (CT) is increased without reducing the scaling of measurements at the low end of the dynamic range by designing the core of the CT to saturate only after about 90 electrical degrees of the maximum current to be measured. The measurements taken during this first 90 electrical degrees before the core saturates are doubled to in effect add measurements representing the mirror image of the first 90 electrical degrees. Timing of the digitized samples taken during the first 90 electrical degrees is adjusted to account for core reset energy errors, by determining the rate of change of current just after a zero crossing and selecting an empirically determined value of current for timing the start of the measurement samples.
REFERENCES:
patent: 4255704 (1981-03-01), Milkovic
patent: 4682100 (1987-07-01), Hagelin
patent: 4847554 (1989-07-01), Goodwin
patent: 4980794 (1990-12-01), Engel
Bowser Barry C.
Eaton Corporation
Vandezande Larry G.
Wieder Kenneth A.
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