Trip device comprising at least one current transformer

Details Trip device comprising at least one current transformer Trip device comprising at least one current transformer

1995-09-19

1998-03-10

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

336165, H02H 300

Patent

active

057268460

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.

REFERENCES:
patent: 3962661 (1976-06-01), Boyd et al.
patent: 4613841 (1986-09-01), Roberts

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