High voltage fuse for interrupting a wide range of currents and

Details High voltage fuse for interrupting a wide range of currents and High voltage fuse for interrupting a wide range of currents and

1981-06-03

1982-11-02

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337162, 337296, H01H 8504

Patent

active

043575889

ABSTRACT:
A high voltage fuse for interrupting a wide range of currents and especially suited for low current interruption is disclosed. The fuse is comprised of a fuse element having a first and a second plurality of portions of reduced cross-sections. The second plurality of portions further comprise two or more parallel conducting paths some of which carry a portion of material which has a lower melting temperature than the melting temperature of the material of the fuse element. The parameters of the first and second plurality of reduced cross-section portions, the lower melting point material, and the fuse element itself are selected to adapt the fuse to provide proper protection for the various current conditions to which a high voltage transformer is subjected. The fuse element provides fast rupturing under short-circuit current conditions while also providing the characteristic of withstanding relatively high inrush current conditions. The fuse element further provides improved low current clearing ability for the fuse, and a fuse which responds quickly to through fault (secondary fault) conditions in a transformer.

REFERENCES:
patent: 2866037 (1958-12-01), Stewart
patent: 3294936 (1966-12-01), Mikulecky
patent: 3835431 (1974-09-01), Rosen et al.
patent: 4198615 (1980-04-01), Mahieu

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