H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/151
H01H 85/20 (2006.01) H01F 27/40 (2006.01) H01H 85/165 (2006.01)
Patent
CA 1054194
OIL IMMERSIBLE CURRENT LIMITING FUSE ASSEMBLY ABSTRACT OF THE DISCLOSURE A current limiting fuse especially adapted for in- stallation within the oil tank of a transformer for protecting the latter from the effects of high magnitude fault currents is provided which is completely fluid-submersible and capable of withstanding severe thermal cycling without damage to the fluid- tight seals thereof. In addition, the fuses hereof are especially constructed for permitting quick, individual helium testing there- of in order to ensure that the fuse meet required saftey stan- dards. The main body of the fuse is encapsulated within a fluid-impervious casing of filled epoxy material which is pene- trated by a pair of opposed, end-mounted, electrically conductive terminals each being threadably connected to the body of the fuse and bearing against a respective resilient seal member to form fluid-tight seals between the opposed terminals and the aper- tured ends of the encapsulating casing. In this manner leakage of oil or other contaminants between the fuse body and encapsulat- ing material is effectively prevented during substantially all conditions encountered in practice. The seal between the cas- ing and the terminals are preferably supplemented by a rigid, non-porous potting compound emplaced around the terminals over the respective seal areas in order to render the entire fuse assembly essentially tamper-proof.
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