RUANG PEMADAMAN UNTUK SAKELAR PEMUTUS DENGAN EKSPANSI PEMADAMAN SENDIRI DAN PEMUTARAN BUNGA API LISTRIK

摘要

An interrupting chamber of a circuit breaker with self-extinguishing expansion in the sf6 comprises a device of the fixed contact 16 cooperating with a movable contact, and a coil 18 of rotation of the arc on an annular track 32. The device of the fixed contact 16 is coaxially surrounded by the coil 18 is cylindrical, and comprises a plurality of contact fingers 42 distributed circumferentially in order to define a hollow space for receiving the moving contact 14, each contact finger 42 comprising a metal structure composite having: - a main body 52 made of copper in the form of a cylindrical sector for the passage of the permanent current in the closed position of the moving contact 14, - an electrode 54 in the conducting material that is refractory, brazed to the front end of the body 52, so as to constitute a fixed arcing contact disposed in the vicinity of the track 32 of rotation of the arc, -, and a segment 58 made of ferromagnetic material brazed onto the periphery of the electrode 54 and a part of the body 52 in order to obtain an optimum guidance of the arc on the track 32.