Magnetically-coupled apparatus for measuring electrical current
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United States of America Patent
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-
Oct 2, 1990
Grant Date -
N/A
app pub date -
Dec 7, 1988
filing date -
Dec 11, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides current measuring apparatus of the type using magnetic coupling, the apparatus comprising a transformer (Tr) having a gap (E) in which a device (G) is disposed suitable for providing a signal which is a function of the magnetic flux existing in the gap with the primary winding (P) of the transformer conveying the current (I) to be measured. The apparatus includes the improvement of employing a device for separating the high frequency A.C. components from the low frequency A.C. components and the D.C. component of the current to be measured. In addition, a device for providing a second signal proportional to the high frequency A.C. component is used, along with a summing device (.epsilon.) for summing a first signal and the second signal as provided by the device located in the gap. The invention is applicable in the electrical industry to measure current.
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