MEDIUM VOLTAGE CONTROLLABLE FUSE

摘要

A medium voltage controllable fuse that provides fast activation in response to both low current and high current faults, and at load currents in response to an external condition detected by an external sensing device. The controllable fuse includes a high-current fault interrupting section, a low-current fault interrupting section, and a trigger element responsive to a fuse controller.

主权项

1. A medium voltage controllable fuse comprising:
a high-current fault interrupting section responsible for opening the fuse and extinguishing arcs in the event of a high current fault, said high-current fault interrupting section including a fuse element comprised of a conducting member; a low-current fault interrupting section responsible for opening the fuse and extinguishing arcs in the event of a low current fault, said low-current fault interrupting section including a fuse element comprised of a first conducting member and a second conducting member, wherein the low-current fault interrupting section is series-connected with the high-current fault interrupting section; a trigger element comprised of at least one trigger wire including an exothermic reactive intermetallic material, wherein said trigger element responds to an external trigger signal by rapidly heating and initiating an exothermic reaction that destroys the trigger element, said trigger element located proximate to the second conducting member; and a fuse body for housing the high-current fault interrupting section, the low-current fault interrupting section and the trigger element.