H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/142
H01H 85/38 (2006.01) H01H 85/047 (2006.01) H01H 85/165 (2006.01)
Patent
CA 1253183
ABSTRACT A fuse for an alternating current power circuit in the medium volatage (3.3 kV to 38 kV) range. The fuse comprises a sealed chamber and a first electrode is mounted within the chamber, the first electrode having a substantially circular periphery and being electrically connected to a first terminal to which a first conductor may be connected. A second electrode is arranged with a conductive surface internally of the chamber, the conductive surface being spaced from the first electrode. A coil is connected in an electrical path between the second electrode and a second terminal to which a second conductor may be connected. An additional electrical contact is mounted within the chamber and in direct electrical connection with the second terminal, and a fusible element directly electrically connects the first electrode and the additional electrical contact. An electronegative halogenated medium fills free space within the chamber. The normal current path between the first and second terminals and through the fuse is by way of the first electrode, the fusible element and the additional electrical contact. The arrangement is such that when the fusible element breaks, the resulting fault current forms an arc between the first electrode and the additional contact, one root of the arc subsequently commutates from the additional contact to the second electrode, the fault current flows through the coil and induces a magnetic field, the magnetic field causes the car to rotate around the first electrode in the electronegative medium, and the arc is thereby extinguished, so interrupting the fault current.
513974
Mccarthy Tetrault Llp
Y.s. Securities Limited
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