Overload relay having adjustably gapped current transformers

Details Overload relay having adjustably gapped current transformers Overload relay having adjustably gapped current transformers

1987-12-17

1988-08-16

Kozma, Thomas J.

Inductor devices

Relatively movable core and coil

Plural coils with plural cores

336134, 336175, H01F 2106

Patent

active

047647442

ABSTRACT:
A static trip overload relay includes a plurality of phase current sensing transformers having two-piece cores. One core piece of each transformer core is positionally mounted by the relay housing, while the other piece is positionally mounted by a carrying case movably mounted within the housing. By varying the case position within the housing, the air gaps between the two core pieces of each transformer core are correspondingly and concurrently varied pursuant to calibrating the relay to operate at any one of a range of circuit current ratings.

REFERENCES:
patent: 2523117 (1950-09-01), Jennings
patent: 3602771 (1971-08-01), Walstad et al.
patent: 3683237 (1972-08-01), Walstad et al.
patent: 3761853 (1973-09-01), Schutz et al.
patent: 4007401 (1977-02-01), Kimmel et al.
patent: 4115829 (1978-09-01), Howell
patent: 4156262 (1979-05-01), Eller et al.
patent: 4443828 (1984-04-01), Legrand et al.
patent: 4454557 (1984-06-01), Hurley

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