Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means
Patent
1989-08-24
1991-06-25
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With coupling means
324126, 336175, 338 49, G01R 122, G01R 1500
Patent
active
050270591
ABSTRACT:
A differential electrical current shunt which is particularly adapted for the measurement of large currents with high accuracy and substantially free of errors due to ageing, connection resistance and differentials therein and thermally induced resistance changes. The shunt, according to the invention divides the large current into two substantially equal portions by forming a preferably elongated aperture in a conductor carrying the large current; the two portions of the conductor formed by the aperture having substantially equal but slightly differing resistances. The two conductor portions are formed with respect to a core such that the conductor portions each form a single turn coil on the core with the induced flux from each conductor portion opposing that included in the coil by the other of the two conductor portions. Since the conductor portions are in close proximity and formed of a unitary conductor and good thermal and electrical conductivity is assured at both ends of the unitary conductor, proportionality of resistance of the conductor portions is accurately maintained throughout a wide range of currents, resistive heating and other environmental conditions.
REFERENCES:
patent: 4492919 (1985-01-01), Milkovic
patent: 4580095 (1986-04-01), De Vries
de Montgolfier Arnaud
Goodwin R. W.
Asman Sanford J.
Karlsen Ernest F.
Schlumberger Industries Inc.
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