Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Meter protection or fraud combatting
Patent
1997-03-17
1999-07-20
Strecker, Gerard
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Meter protection or fraud combatting
324137, 324142, 324156, 361672, G01R 118, G01R 1124, G01R 700
Patent
active
059260149
ABSTRACT:
Magnetic shields for plastic molded electricity meter frames are positioned to substantially block external magnetic fields from adversely affecting operation of meter components. The shield can be utilized with either electromechanical or electronic energy meters. In an electromechanical watthour meter which employs an aluminum disk driven to rotate through a magnetic field produced by a retarding magnet, the meter frame includes an integrally formed retarding magnet shield and an integrally formed bearing shield. The shields are coextensive with the frame, and extend from an inner periphery of the frame toward the retarding magnet and the bearing, respectively. The shields are formed of a magnetically permeable powder, such as a ferrite powder mixed with the plastic material from which the meter frame is molded. The shields divert externally applied fields away from the magnetically sensitive components of the meter without adversely affecting meter accuracy.
REFERENCES:
patent: 3602816 (1971-08-01), Van Bennekom
patent: 3626345 (1971-12-01), Funaki
patent: 4030031 (1977-06-01), Strucker
patent: 4083000 (1978-04-01), Becker
patent: 4760333 (1988-07-01), Ichimura
patent: 5027061 (1991-06-01), Palmer et al.
patent: 5239259 (1993-08-01), Todoroki et al.
patent: 5457872 (1995-10-01), Sakata et al.
patent: 5486755 (1996-01-01), Horan et al.
General Electric Company
Snyder Marvin
Stoner Douglas E.
Strecker Gerard
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