Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Reexamination Certificate
2006-12-29
2008-09-23
Hollington, Jermele M. (Department: 2829)
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
Reexamination Certificate
active
07427856
ABSTRACT:
Disclosed is a current sensing apparatus which includes a first current transformer that, when energized, has a first input current and a first output current, the first output current being less than the first input current, the first current transformer stepping down the current. The current sensing apparatus includes a second current transformer in electrical communication with the first current transformer that, when energized, has a second input current and a second output current, where the second input current is substantially less than the first output current. The second output current being greater than the first output current, the second current transformer stepping up the current. The stepped up second output current is substantially equal to a nominally rated input current of a low voltage device in electrical communication with the second current transformer.
REFERENCES:
patent: 5684426 (1997-11-01), De Doncker
patent: 6434715 (2002-08-01), Andersen
patent: 6442010 (2002-08-01), Kasztenny et al.
patent: 6469882 (2002-10-01), Tignor
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IEEE Std C57.13-1993, IEEE Standard Requirements for Instrument Transformers, pp. 1-73; The Institute of Electrical and Electronics Engineers, Inc.; 1994.
http://www.physics.uc.edu/˜bortner/labs/Physics%202%20experiments/Electromagnetic%20Induction/Electromagnetic%20Induction%20htm.htm.
Cantor & Colburn LLP
General Electric Company
Hollington Jermele M.
Nguyen Tung X
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