Abstract:
PROBLEM TO BE SOLVED: To achieve an electrode assembly of a vacuum interrupter, capable of preventing a coil conductor, a contact electrode plate or a supporting electrode plate from being deformed by strong impact force applied on an electrode upon an introducing operation of the vacuum interrupter.SOLUTION: An electrode assembly of a vacuum interrupter comprises: electrode plates 110, 120 in which slits 111, 121 are formed, respectively; coil conductors 131, 135 arranged between the electrodes plate 110, 120; conductor connecting pins 141, 143, 142, 144 provided between the electrode plates 110, 120 and the coil conductors 131, 135 and forming a conductive path; and supporting members 151, 152, 155, 156 provided between the electrodes plate 110, 120 and the coil conductors 131, 135 and supporting the electrode plates 110, 120. Both-sides supporting members provided on both sides centered on the coil conductors 131, 135 are provided so that at least parts of the both-sides supporting members are overlapped each other when being projected in an axial direction.
Abstract:
PROBLEM TO BE SOLVED: To provide a production method of a contact material for vacuum valve in which adhesion is enhanced by preventing a clearance from occurring to the bonding surface of the contact material and a base metal.SOLUTION: In the production method of a contact material for vacuum valve where a disc-like base metal 2 being brazed to an electrode rod and a contact member 1 provided on the bonding surface 2b on the reverse side of the brazing surface 2a of the base metal 2 are formed integrally by sintering, a tapered surface is formed in the outer peripheral side surface 2c of the base metal 2 so that the external-diameter on the brazing surface 2a side becomes smaller than that of the bonding surface 2b side. The bonding surface 2b and the outer peripheral side surface 2c of the base metal 2 are covered with a mixed material of a plurality of kinds of metal powder composing the contact member 1 and stamped, and then the base metal 2 and the contact member 1 are brought into tight contact and integrated.
Abstract:
PROBLEM TO BE SOLVED: To provide a vacuum interrupter for a vacuum circuit breaker to increase a lateral magnetic field that affects arc driving force.SOLUTION: In a vacuum interrupter for a vacuum circuit breaker, an attraction member 180 made of a ferromagnetic body is provided to surround between a stationary electrode 130 and a movable electrode 140 so that a lateral magnetic field generated in the radial direction between the stationary electrode 130 and the movable electrode 140 is attracted to the attraction member 180. Thus, a component in the horizontal direction of the lateral magnetic field is enhanced between the stationary electrode 130 and the movable electrode 140, and ultimately, the lateral magnetic field between both electrodes 130 and 140 is further increased, thereby enhancing arc driving force.
Abstract:
PROBLEM TO BE SOLVED: To provide an electrode for a vacuum circuit breaker capable of improving a current cut-off performance and a capacitor opening/closing performance.SOLUTION: A longitudinal magnetic field shaped electrode 10 is constituted by a cup-shaped contact material 12 fixed to an end of a conduction rod 11, and a contact plate 14 fastened to an end face of the cup-shaped contact material 12 and serving as an arc-generation part. Plural slits 13 inclined against an axial line are formed at an outer peripheral portion on one end of the cup-shaped contact material 12. The contact plate 14 is integrally manufactured using a center member 22 made of a high current cut-off performance material, and an outer peripheral member 21 which is made of a high breakdown voltage material compatible with the center member and having a high cut-off performance, and arranged and fastened on the outside of the center member 22.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for manufacturing an electrode material for a vacuum circuit breaker, whereby withstand voltage, breaking performance and capacitor switching performance can be improved, and the electrode material for a vacuum circuit breaker.SOLUTION: The electrode material for a vacuum circuit breaker is produced by a method comprising a mixing step, a press-sintering step and a Cu infiltration step. In the mixing step, an Mo powder having a particle diameter of 0.8-6 μm is homogeneously mixed with a thermite Cr powder having a particle diameter of 40-300 μm in such a manner as giving a mixing ratio (Mo:Cr) of 1:1-9:1 and satisfying the weight relation: Mo≥Cr. In the press-sintering step, the resultant mixture is pressure-molded under a pressing pressure of 1-4 t/cmso as to give a molded article, and the molded article is subsequently sintered by maintaining the same at a temperature of 1,100-1,200°C for 1-2 h in a heating furnace so as to give a calcined article. In the Cu infiltration step, a thin Cu plate is placed on the calcined article and maintained at a temperature of 1,100-1,200°C for 1-2 h in a heating furnace so as to induce liquid-phase sintering of Cu and its infiltration into the calcined article.