Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means
Patent
1987-03-04
1989-04-25
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With coupling means
338 49, G01R 120, H01C 500
Patent
active
048251534
ABSTRACT:
In order to minimize the effect of return current flow on a current measuring shunt, the present invention proposes a shunt having a compensation circuit to compensate for the asymmetrical effect of such return currents. Such compensation is provided by two measuring circuits which are to measure the voltage drop across the shunt, and each circuit is located in a median plane of the shunt. The path of each of these measuring circuits is optimized and established in the calibrated configuration of the shunt. These parallel measuring circuits also have their inputs and outputs connected together respectively. Particularly, the present invention relates to shunts having a tubular or rectangular configuration and including such compensation circuits.
REFERENCES:
patent: 1050694 (1913-01-01), Roller
patent: 2640092 (1953-05-01), Fett et al.
patent: 4240059 (1980-12-01), Wolf et al.
patent: 4494068 (1985-01-01), Ley et al.
Malewski et al; "Elimination of the Skin Effect Error in Heavy-Current Shunts"; IEEE Transactions on Power Apparatus and Systems; vol. PAS-100; No. 3; Mar. 1981; pp. 1333-1340.
Leclerc Marc
Malewski Ryszard
Hydro-Quebec
Karlsen Ernest F.
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