Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means
Patent
1985-04-16
1988-02-23
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With coupling means
336 84C, 336181, 336182, G01R 120, H01F 2728
Patent
active
047273160
ABSTRACT:
A transformer current sensor having primary turns carrying a primary current for a superconducting coil and secondary turns only partially arranged within the primary turns. The secondary turns include an active winding disposed within the primary turns and a dummy winding which is not disposed in the primary turns and so does not experience a magnetic field due to a flow of current in the primary turns. The active and dummy windings are wound in opposite directions or connected in series-bucking relationship, and are exposed to the same ambient magnetic field. Voltages which might otherwise develop in the active and dummy windings due to ambient magnetic fields thus cancel out. The resultant voltage is purely indicative of the rate of change of current flowing in the primary turns.
REFERENCES:
patent: 1665947 (1928-04-01), Brennan
patent: 2452862 (1948-11-01), Neff
patent: 3312919 (1967-04-01), Ross
S. S. Shen et al., "Pulse Loss and Voltage Measurements on Superconducting Magnets", IEEE Transactions on Magnetics, vol. MAG-13, No. 1 (Jan. 1977), pp. 855-858.
V. Nassisi et al., "Rogowski Coils: Theory and Experimental Results", Rev. Sci. Instru., vol. 50, No. 7, Jul. 1979, pp. 900-902.
Shen Stewart S.
Wilson C. Thomas
Breeden David E.
Hamel Stephen D.
Hightower Judson R.
Karlsen Ernest F.
The United States of America as represented by the United States
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