Low temperature coefficient shunt for current measurement

Details Low temperature coefficient shunt for current measurement Low temperature coefficient shunt for current measurement

1986-12-22

1992-04-21

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With coupling means

324105, G01R 120

Patent

active

051072041

ABSTRACT:
A current sensor employs a main resistor of a low temperature-coefficient material for producing a voltage drop proportional to a load current therein. A second resistor, also of a low temperature-coefficient material, and preferably having a resistance substantially exceeding that of the main resistor, is connected in parallel with the main resistor. The current divides between the main and the second resistors according to the ratio of their resistances. An output signal, reduced at least in accordance with a ratio of resistances of the first and second resistors, is obtained from the second resistor. Resistive heating of the main resistor is reduced by using a short path length in the direction of current flow and as large an area transverse to the direction of current as possible. A current transformer may employ the second resistor as a primary to step down further the current in the output signal.

REFERENCES:
patent: 606171 (1898-06-01), Shallenberger
patent: 1618058 (1927-02-01), Church
patent: 4492919 (1985-01-01), Milkovic
patent: 4616176 (1986-10-01), Mercure et al.
U.S. Patent Application 07/399,344, filed Aug. 28, 1989, entitled Coaxial Current Sensors.
Information Disclosure Statement submitted in the patent application identified as document AR herein.

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