Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Meter protection or fraud combatting
Patent
1994-12-27
1996-01-23
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Meter protection or fraud combatting
324127, 324142, G01R 1148, G01R 120
Patent
active
054867550
ABSTRACT:
An electronic meter for measuring electricity includes a magnetic shield positioned adjacent each outermost toroidal coil of electrical current sensors to thereby resist tampering by a magnetic field applied from outside the meter housing. The magnetic shield has an arcuate cross-sectional shape corresponding to the outermost coil portion and has a predetermined arc length covering only a predetermined portion of the outermost coil portion. The shield preferably has a semicylindrical cross-section shape thereby covering only half the toroidal coil.
REFERENCES:
patent: 4413230 (1983-01-01), Miller
patent: 4887029 (1989-12-01), Hemminger
Balch Richard A.
Elmore David D.
Horan Patrick J.
Legere Joseph R.
Bowser Barry C.
General Electric Company
Wieder Kenneth A.
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