Patent
Trip device comprising at least one current transformer
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TLDR
A trip device comprises at least one current transformer for supplying power to electronic circuits as mentioned in this paper, which is useful, for example, in a circuit breaker. But the trip device is not suitable for high current levels, as the magnetic flux passes through the shunt via the air gap.Abstract:
A trip device comprises at least one current transformer for supplying power to electronic circuits. The current transformer comprises a magnetic circuit, surrounding a primary conductor, a secondary winding wound onto a part of the magnetic circuit forming a core, and a magnetic shunt branch connected on the magnetic core. The magnetic shunt comprises an air-gap. When the current flowing in the primary conductor is of low value, the magnetic flux stopped by the air-gap flows essentially via the core of the secondary winding. At high current levels the induction is greater and a large part of the magnetic flux passes through the shunt via the air-gap. The current transformer has a non-linear current response which limits excess power supplied to the electronic circuits and dissipated in the transformer. The trip device is useful, for example, in a circuit breaker.read more
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References
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Patent
Integrated transformer and inductor
TL;DR: In this article, the magnetic shunt path is used as a current-limiting inductor to reduce the magnetic flux flux in a transformer, which is useful in electronic ballast circuits for gas discharge lamps.
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