Circuit breaker with incorporated current transformer

Details Circuit breaker with incorporated current transformer Circuit breaker with incorporated current transformer

1983-04-22

1985-06-04

Macon, Robert S.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200144R, 200148A, 200148B, H01N 3359

Patent

active

045216576

ABSTRACT:
The circuit breaker comprises: a stand (1) at ground potential; a first insulating column (2) supported by said stand and filled with a highly dielectric gas; a second insulating column (4) coaxially supported by said first insulating column, said second insulating column serving as a cut-out chamber and including moving contacts (6) connected to a first current terminal (8) and associated with moving contact drive means (3), and fixed contacts (10) connected to a second current terminal (12). Said second column supports a third insulating column (13) which is coaxial with said first and second columns. At least one magnetic circuit and secondary winding (14A-14D) of a current transformer are disposed around said third column in the neighborhood of its connection to said second column. The primary circuit of said current transformer is constituted by a conductor (11) connecting said fixed contacts to said second terminal. An anti-discharge screen (26) is disposed inside said third column level with the transformer and electrically connected to ground via the junction between said second and third columns (15) and via a metal tube (27) which extends from said junction substantially down to ground level and which also serves to house connections (28) between said secondary winding and measuring apparatus.

REFERENCES:
patent: 3114815 (1963-12-01), Easley et al.
patent: 3935408 (1976-01-01), Taylor

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