Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent
1988-05-17
1989-09-05
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
324127, 324251, G01R 120, G01R 3300, G01R 1900
Patent
active
048642231
ABSTRACT:
A measuring transformer comprises a ferromagnetic core having a central branch. The central branch comprises at least one unit that is surrounded in part by an electrical conductor in the form of a U. Each unit of the central branch of the core has two outer air gaps and one or more central air gaps. Each outer air gap has length, that when measured in the longitudinal direction of the unit, is longer than the sum of the lengths of the one or more central air gaps. At least one magnetic sensor is contained in a central air gap of each unit and the central branch includes a total of at least two magnetic sensors. The measuring transformer is especially well suited for use in multifunction measuring instruments.
REFERENCES:
patent: 2924775 (1960-02-01), Neugebauer
patent: 3323056 (1967-05-01), Haley
patent: 4742296 (1988-05-01), Petr et al.
patent: 4749939 (1988-06-01), Seitz
F. Kuhrt et al., "Hallgeneratoren", Springer-Verlag, pp. 10-11, 114-15, 267-273.
IEEE Trans. on Power Apparatus & Systems, vol. PAS-99, No. 3 May/Jun. 1980, "Hall Effect Measurement of Real and Reactive Power in a Faraday Machines Laboratory", Gary Johnson.
Halder Mathis
Joder Andreas
Seitz Thomas
Karlsen Ernest F.
LGZ Landis & Gyr Zug AG
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