Electric arc extinguishing device for a three-phase power distribution system and corresponding power distribution system
This electric arc extinguishing device for a three-phase power distribution system comprises at least one metal strip ( 6 ) and at least one insulating support ( 7 ) on which the strip is mounted and comprising means for attaching the device between current distribution bars extending from side to side, the support comprising lateral faces ( 11 ) bearing against said bars, the strip being mounted on the support in such a way as to be internally offset relative to said lateral faces.
1. An electric arc extinguishing device for a three-phase electrical power distribution system, characterized in that the extinguishing device comprises at least one metal blade and at least one insulating support on which the blade is mounted and including attachment means for attaching the device between current distribution bars extending side by side, the support including lateral faces abutting against said bars, the blade being mounted on the support in such a way as to be internally offset with respect to said lateral faces.
2. The device as claimed in claim 1 , including a base provided with said attachment means and two arms extending in parallel from the base and including a free end via which an arc is propagated in the device, the blade extending from a base in the direction of the free end of the arms.
3. The device as claimed in claim 2 , in which the base includes a transverse orifice for attaching the support onto the bars by means of a nut made of electrically insulating material.
4. The device as claimed in claim 3 , in which the support comprises polygonal lateral pins fitting into corresponding holes made in the bars.
5. The device as claimed in claim 2 , including a plate made of electrically insulating material on at least one of faces of the base.
6. The device as claimed in claim 1 , in which the blade comprises a single end edge.
7. The device as claimed in claim 6 , in which the end edge is rounded.
8. The device as claimed in claim 6 , in which the end edge is beveled.
9. The device as claimed in claim 6 , in which the end edge is triangular.
10. A three-phase electrical power distribution system including a set of current distribution bars extending side by side and covered with an insulator and including opposing insulator-free zones, characterized in that the power distribution device comprises a set of electric arc extinguishing devices each mounted between two current distribution bars and each including at least one metal blade and at least one insulating support on which the blade is mounted, the device including attachment means for attaching the support onto the bars, the support including external lateral faces abutting against the bars, the blade being mounted in such a way as to be internally offset with respect to the lateral faces.