Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1988-12-09
1989-12-12
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
324117R, 324127, 324252, G01R 3306, G01R 3300
Patent
active
048870277
ABSTRACT:
A leadless current-sensing device for sensing current flowing in a conductor when the device is positioned in the vicinity of the current-carrying conductor. The device has a probe having a set of two current sensors disposed at a preset radial angle alpha ".alpha." in respect to each other. The probe also has a second set of two current sensors also disposed at the same preset radial angle in respect to each other. The first and second sets of current sensors are disposed at a preset radial angle delta ".delta." in respect to each other. The first and second sets of current sensors are also disposed at a preset axial distance "z" in respect to each other. The device includes a voltage processing circuit for processing the four distinct voltage potentials induced in the four current sensors. The processing circuit compares to each other two voltage potentials from either set of current sensors to calculate the orientation angle that each current sensor makes with the conductor. The processing circuit also compares the greater voltage potential from the first set of current sensors to the greater voltage potential from the second set of current sensors to calculate a voltage ratio between them and uses this voltage ratio along with an orientation angle and the preset axial distance "z" to calculate the linear distance of the probe from the conductor. Once the orientation angle and the linear distance of the probe from the conductor are known the device calculates the magnitude of the current flowing in the conductor.
REFERENCES:
patent: 4053829 (1977-10-01), Maruo
patent: 4296377 (1981-10-01), Ohkubo
Eisenzopf Reinhard J.
Fisher William L.
Nguyen Vinh P.
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