Magnetically shunted current transformer

Details Magnetically shunted current transformer Magnetically shunted current transformer

1975-04-22

1976-06-08

Kozma, Thomas J.

Inductor devices

With electric and/or magnetic shielding means

336175, 336212, 336219, H01F 1504, H01F 2724

Patent

active

039626610

ABSTRACT:
A magnetically shunted current transformer for use with a current carrying conductor, and being of the type having a non-distributed secondary winding is disclosed. The transformer includes a magnetic core comprising first and second separable core sections adapted for placement about the conductor wherein the ends of the sections abut one another to form a substantially continuous core about the conductor. The secondary winding is carried by the continuous core and surrounds a portion of at least one of the sections. A spring bail clamps the core sections together. First and second magnetic shunt members are respectively disposed on opposite sides of the continuous core. Each shunt member comprises a plurality of stacked steel lamina forming a lamination having an elastomeric housing or a jacket molded thereover. The shunt members are provided with a geometry substantially conforming to the continuous magnetic core except at their end portions which confront the secondary winding. Fastening means are provided to removably fasten the shunt members to the continuous core to provide a substantially unitary assembly. Accordingly, the leakage flux is captured by the shunt members thereby allowing a higher conductor current to flow before the transformer saturates; and, thereby, to provide a distributed transformer type operation to closely simulate an ideal current transformer.

REFERENCES:
patent: 3478291 (1969-11-01), Lugten
patent: 3525964 (1970-08-01), Stevenson
patent: 3671903 (1972-06-01), Arrington et al.

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