| 摘要 |
An extinguishing chamber for the electric arc of the magnetic blow-out type, is formed by two symmetrical sections disposed in specular position in relation to a rectilinear or curvilinear axis corresponding approximately to the path of the movable contact of the electric circuit breaker, of which the said extinguishing chamber is a part, and makes use in each section of a constant magnetic field generated by permanent magnets coupled in pairs by means of a yoke of metallic material having a good magnetic permeability and apt to conduct the magnetic return flux generated by the same pairs of permanent magnets externally to the said section. Such field forces said arc to go through a slit delimited by electrically insulating refractory walls, provided in the central part of each section. In each of said sections, in addition to said constant magnetic field, also a supplementary variable magnetic field is caused to develop, said supplementary variable magnetic field having the same direction of the constant field and being generated by one or more electrically insulated windings wound around an additional yoke. The arc during its movement inside the slit of the section concerned, produced by the constant magnetic field, skims over properly shaped connection horns arranged inside said slit and forming the ends of said windings. |
