Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1979-08-13
1981-06-16
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
324127, 324254, G01R 3300, G01R 120
Patent
active
042740525
ABSTRACT:
It is known for current meters to operate by sensing the magnetic field produced by the unknown current being measured. Such meters may include a core (200-1) of magnetic material which may be opened to receive a current carrying conductor (400-1) and which is adapted to be coupled to the magnetic fields surrounding the conductor. Winding (300-1), placed around the core, is excited at a fundamental frequency as supplied by an ac source (110). Responsive thereto, an output voltage of twice or higher even harmonics of the exciting frequency is produced. The output voltage is proportional to the magnetic flux produced by the current being measured and hence may be extended through a meter for indicating the unknown current. Such arrangements tend to be expensive. The instant current meter (100) includes an arrangement for providing a dc current (190) through the core winding to neutralize the nonsymmetry of the magnetic field created by the unknown current. The neutralizing mitigates the detected second harmonic (120, 130, 140). When the second harmonic is minimized, the core winding dc current (170 ) equals the unknown conductor current.
REFERENCES:
patent: 1825514 (1931-09-01), Fitzgerald
patent: 2053154 (1936-09-01), La Pierre
patent: 2272772 (1942-02-01), Hathaway
patent: 2836791 (1958-05-01), Kaplan
patent: 3007106 (1961-10-01), Bergh et al.
Model 428D Oper. and Ser. Manual; Sep. 1963; Hewlett-Packard Co., Palo Alto, Calif.
Gentry, Jr. James H.
Stiles, Sr. Gilbert J.
Bell Telephone Laboratories Incorporated
Karlsen Ernest F.
Roddy Richard J.
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