Measuring transformer for measuring of a current flowing in an e

Details Measuring transformer for measuring of a current flowing in an e Measuring transformer for measuring of a current flowing in an e

1986-06-09

1988-06-07

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

047499397

ABSTRACT:
A measuring transformer for measuring a current flowing in an electrical conductor is disclosed. Illustratively, the transformer comprises a three legged ferromagnetic core whose center leg at least partially surrounded by the electrical conductor. The center leg defines a center air gap and two outer air gaps, the center gap containing a magnetic field snesor and one outer gap being located at each end of the center leg. The two outer gaps are longer than the center gap when measured in the longitudinal direction of the center leg. The center leg and the magnetic sensor may form a single construction element. This configuration permits an especially precise, simple, and dependable installation of the measuring transformer, without worsening non-linearities or phase errors, while improving air-gap tolerances.

REFERENCES:
patent: 3885212 (1975-05-01), Herbert
patent: 4124821 (1978-11-01), Petr
patent: 4394619 (1983-07-01), Gschwandtner
Barlow, H. E. M.; "The Application of the Hall Effect . . . "; Proceedings of the Institute of Electrical Engineers (Great Britain); Mar. 1955; pp. 179-185; copy in 324-117 H.
Hallgeneratoren, Eigenschaften und Anwendungen, F. Kuhrt and H. J. Lippmann, Springer Verlag, 1968, pp. 10-11, pp. 267-275.

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