Reduced flux current sensor
First Claim
1. An alternating current sensor for measuring an alternating primary current inducing a magnetic flux density at least defined over a known region comprising:
- a first sensor for measuring time rate changes in magnetic flux due to the primary current over a first predetermined area within the known region;
a second sensor for measuring time rate changes in magnetic flux due to the primary current over a second predetermined area within the known region, the time rate changes in magnetic flux due to the primary current measured by said second sensor being a predetermined calibrated amount different from the time rate changes in magnetic flux due to the primary current measured by said first sensor; and
a current source for generating a current inducing time rate changes in magnetic flux over a third predetermined area within the known region to substantially offset the difference between the time rate changes in magnetic flux due to the primary current measured by said first sensor and the time rate changes in magnetic flux due to the primary current measured by said second sensor.
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Accused Products
Abstract
An alternating current sensor for measuring a primary alternating current inducing a magnetic flux density defined over a known region comprises: a first sensor for measuring changes in magnetic flux due to the primary current over a first predetermined area included within the known region; a second sensor for measuring changes in magnetic flux due to the primary current over a second predetermined area within the known region, the changes in magnetic flux measured by the second sensor being a predetermined amount different from the changes in magnetic flux measured by the first sensor; and a current source for generating a current inducing changes in magnetic flux over a third predetermined area to offset the difference between the changes in magnetic flux measured by the first sensor and the changes in magnetic flux measured by the second sensor.
65 Citations
19 Claims
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1. An alternating current sensor for measuring an alternating primary current inducing a magnetic flux density at least defined over a known region comprising:
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a first sensor for measuring time rate changes in magnetic flux due to the primary current over a first predetermined area within the known region; a second sensor for measuring time rate changes in magnetic flux due to the primary current over a second predetermined area within the known region, the time rate changes in magnetic flux due to the primary current measured by said second sensor being a predetermined calibrated amount different from the time rate changes in magnetic flux due to the primary current measured by said first sensor; and a current source for generating a current inducing time rate changes in magnetic flux over a third predetermined area within the known region to substantially offset the difference between the time rate changes in magnetic flux due to the primary current measured by said first sensor and the time rate changes in magnetic flux due to the primary current measured by said second sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of measuring a primary alternating current inducing a magnetic flux density at least defined over a known region, said method comprising the steps of:
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sensing time rate changes in magnetic flux due to the primary current over a first predetermined area within the known region; sensing time rate changes in magnetic flux due to the primary current over a second predetermined area within the known region, the magnetic flux time rate changes due to the primary current sensed over the first area being a predetermined calibrated amount different from the magnetic flux time rate changes due to the primary current sensed over the second area; and generating a current inducing magnetic flux time rate changes over a third predetermined area to substantially offset the difference between the time rate changes in magnetic flux due to the primary current sensed over the first area and the time rate changes in magnetic flux due to the primary current sensed over the second area. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification