High continuous current capacity oil expulsion fuse

Details High continuous current capacity oil expulsion fuse High continuous current capacity oil expulsion fuse

1978-10-13

1980-05-27

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337203, 337204, H01H 8514, H01H 8502

Patent

active

042052955

ABSTRACT:
An oil expulsion fuse has multiple rupture-resistant fuse wire arc bores for providing fault current protection in high voltage distribution circuits in the 25-35 KV range. In preferred forms, the fuse has a Teflon core defining three discrete, small diameter cylindrical bores, each containing a respective fuse wire, whereby sufficient deionizing gas flow is generated upon fusing of the wires to effectively extinguish arcs formed in the bores, even in the face of high recovery voltage rates associated with distribution voltages above 15 KV. The multiple bores communicate with common chambers at respective ends thereof which are vented to allow connective oil flow through the fuse during normal operation. One chamber has a larger effective vent area than the other and the chambers at opposite ends of the fuse intercommunicate so that upon sequential melting of the fuse wires which occurs during fault interruption, the greater resistance to gas expulsion at one end of the fuse than the other causes gas to be directed down through the bores to prevent arc restrike.

REFERENCES:
patent: 2156058 (1939-04-01), Lohausen
patent: 2291341 (1942-07-01), Lincks
patent: 4041434 (1977-08-01), Jacobs et al.

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