Current transformers with nanocrystalline alloy toroidal core: analytical, computational and experimental studies

Luciano, Benedito Antonio; Batista, Thiago de Carvalho; Freire, Raimundo C. S.; Guerra, Francisco das Chagas Fernandes; Castro, Walman Benı́cio de

doi:10.1590/s1516-14392012005000051

Cited by 6 publications

(1 citation statement)

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“…Such a usage of toroidal coils was first suggested by A. P. Chattock already in the 19 th century [3], and by W. Rogowski and W. Steinhaus some decades later [4]. Recently, scientists have been developing new materials for the magnetic core of toroidal coils [5].…”

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Toroidal Coil in Measuring Alternating Current at a Distance

Mäkinen¹

2014

JEMAA

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This article discusses the use of a toroidal coil in measuring alternating current from a straight current-carrying wire passing perpendicularly through the coil. The sinusoidally oscillating current generates a sinusoidally oscillating magnetic field in its vicinity. This, in turn, induces a sinusoidally oscillating emf in the toroid. This (measured) emf can be used in order to calculate the magnitude of the electric current in the wire. The use of such technique might be sensitive to the location of the point at which the wire passes through the toroid. If the location is not known very precisely, this might cause errors in the value of the calculated current. We wanted to study if the result does not depend on the location of the wire at all, as is usually stated, or not. The study was done by deriving a single analytical formula for finding out the calculated current with the wire passing through any given point inside the toroid. This formula was then solved at about 2000 points inside a toroid to see if the location of the wire affects the result or not.

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confidence: 99%