Abstract: A vacuum valve includes: a vacuum vessel; a cylinder; a partition wall separating an inside of the vacuum vessel from an inside of the cylinder; a movable conductor penetrating the partition wall being movable in an axial direction; a fixed contact fixed inside the vacuum vessel; a moving contact integrated with the movable conductor and being capable of separating from the fixed contact and coming into contact with the fixed contact in association with movement of the movable conductor; a lid that covers an end of the cylinder, the end being on a side opposite to the partition wall; a connecting rod penetrating the lid and coupled to the movable conductor via an insulating rod as an insulator; and a holder that holds the connecting rod while preventing movement of the connecting rod toward the fixed contact in a state where the moving contact is separated from the fixed contact.

Abstract: The present disclosure aims to provide an electrical contact to which a low boiling point metal is added, the electrical contact being able secure both mechanical strength and conductivity at the same time. The electrical contact according to the present disclosure includes a base material made of Cu, particles of a high melting point substance dispersed in the base material, the particles being made of at least one of a high melting point metal or a carbide of the high melting point metal, and Te and Ti dispersed in the base material, wherein, the Te of 3.5 to 14.5 mass % is added where the total is 100 mass %, and Ti/Te is 0.12 to 0.38.

Abstract: A vacuum valve includes a structure having: a container in which a fixed-side end plate and a movable-side end plate are fixed to both ends of an insulation cylinder; and an arc shield at an intermediate portion of the insulation cylinder. The vacuum valve includes: a voltage nonlinear resistance layer containing particles having a voltage nonlinear resistance characteristic at at least either one of an outer creepage surface or an inner creepage surface of the insulation cylinder. A filling rate of the particles in the voltage nonlinear resistance layer has a distribution along a film thickness direction, and a filling rate of the particles in an outermost layer is not greater than half of an average filling rate of the particles in an entirety of the voltage nonlinear resistance layer.

Abstract: A vacuum circuit breaker comprises: a grounded tank; a vacuum chamber disposed in the grounded tank; an insulating tube disposed between one side end surface inside the grounded tank and one side end surface outside the vacuum chamber; a fixed rod inserted in the vacuum chamber; a fixed-side electrode disposed in the vacuum chamber at one end of the fixed rod; a movable-side electrode disposed in the vacuum chamber so as to face the fixed-side electrode; a movable rod partially disposed in the insulating tube and having one end with the movable-side electrode disposed thereon; a sliding member disposed on the movable rod so as to slide in the insulating tube; and a contact pressure spring disposed at the movable rod between one side end surface inside the grounded tank and the sliding member.

Abstract: A vacuum interrupter according to the present disclosure is configured such that a linear resistive layer and a nonlinear resistive layer are disposed so as to cover at least a part of a periphery of an insulation container, and a magnitude relationship of each resistivity is R1>R3>R2, where a resistivity of the nonlinear resistive layer less than an operating electric field is R1, a resistivity less than or equal to an impedance when a lightning impulse is applied is R2, and a resistivity of the linear resistive layer is R3.

Abstract: A vacuum valve includes: a vacuum vessel; a cylinder; a partition wall separating an inside of the vacuum vessel from an inside of the cylinder; a movable conductor penetrating the partition wall being movable in an axial direction; a fixed contact fixed inside the vacuum vessel; a moving contact integrated with the movable conductor and being capable of separating from the fixed contact and coming into contact with the fixed contact in association with movement of the movable conductor; a lid that covers an end of the cylinder, the end being on a side opposite to the partition wall; a connecting rod penetrating the lid and coupled to the movable conductor via an insulating rod as an insulator; and a holder that holds the connecting rod while preventing movement of the connecting rod toward the fixed contact in a state where the moving contact is separated from the fixed contact.

Abstract: The present disclosure aims to provide an electrical contact to which a low boiling point metal is added, the electrical contact being able secure both mechanical strength and conductivity at the same time. The electrical contact according to the present disclosure includes a base material made of Cu, particles of a high melting point substance dispersed in the base material, the particles being made of at least one of a high melting point metal or a carbide of the high melting point metal, and Te and Ti dispersed in the base material, wherein, the Te of 3.5 to 14.5 mass % is added where the total is 100 mass %, and Ti/Te is 0.12 to 0.38.

Abstract: Provided is a small-sized, reliable vacuum interrupter that does not involve upsizing and complication of the reduction load application mechanism. A vacuum interrupter of the present invention includes a magnetic body disposed on a circumferential edge around a stem surface of at least one of a moving current-carrying stem and a fixed current-carrying stem. The magnetic body includes a lower magnetic permeance portion having a lower magnetic permeance than the other portion. The lower magnetic permeance portion produces a magnetic field parallel to the axial direction. Arc discharge is driven in the direction of the parallel magnetic field, thus being extinguished.

Abstract: In an electric contact including a base material, high-melting-point substance particles, and an intermetallic compound, the intermetallic compound containing a MnX compound (X represents Te or Se) and a compound of a Mn—Cu solid-solution phase and X, is dispersed in the base material. If the Vickers hardness of the high-melting-point substance particles is higher than 0 Hv and lower than 200 Hv, the particle diameter of the high-melting-point substance particles is not smaller than 0.1 ?m and not larger than 100 ?m. If the Vickers hardness of the high-melting-point substance particles is 200 Hv or higher, the particle diameter is not smaller than 0.1 ?m and not larger than 10 ?m. The mass of X atoms is not lower than 1.5 mass % and not higher than 15 mass %. The atomic weight ratio Mn/(Mn+X) is not lower than 20 at % and not higher than 80 at %.

Abstract: Provided is a small-sized, reliable vacuum interrupter that does not involve upsizing and complication of the reduction load application mechanism. A vacuum interrupter of the present invention includes a magnetic body disposed on a circumferential edge around a stem surface of at least one of a moving current-carrying stem and a fixed current-carrying stem. The magnetic body includes a lower magnetic permeance portion having a lower magnetic permeance than the other portion. The lower magnetic permeance portion produces a magnetic field parallel to the axial direction. Arc discharge is driven in the direction of the parallel magnetic field, thus being extinguished.

Abstract: In an electric contact including a base material, high-melting-point substance particles, and an intermetallic compound, the intermetallic compound containing a MnX compound (X represents Te or Se) and a compound of a Mn—Cu solid-solution phase and X, is dispersed in the base material. If the Vickers hardness of the high-melting-point substance particles is higher than 0 Hv and lower than 200 Hv, the particle diameter of the high-melting-point substance particles is not smaller than 0.1 ?m and not larger than 100 ?m. If the Vickers hardness of the high-melting-point substance particles is 200 Hv or higher, the particle diameter is not smaller than 0.1 ?m and not larger than 10 ?m. The mass of X atoms is not lower than 1.5 mass % and not higher than 15 mass %. The atomic weight ratio Mn/(Mn+X) is not lower than 20 at % and not higher than 80 at %.

Abstract: A vacuum interrupter includes a fixed side contact and a movable side contact; a fixed side electrode rod connected to the fixed side contact; a movable side electrode rod connected to the movable side contact; a fixed side reinforcement plate which is arranged between the fixed side electrode rod and the fixed side contact, and whose rim portion has a step portion to be arranged apart from the back of the fixed side contact; and a movable side reinforcement plate which is arranged between the movable side electrode rod and the movable side contact, and whose rim portion has a step portion to be arranged apart from the back of the movable side contact.

Abstract: A vacuum interrupter includes a fixed side contact and a movable side contact; a fixed side electrode rod connected to the fixed side contact; a movable side electrode rod connected to the movable side contact; a fixed side reinforcement plate which is arranged between the fixed side electrode rod and the fixed side contact, and whose rim portion has a step portion to be arranged apart from the back of the fixed side contact; and a movable side reinforcement plate which is arranged between the movable side electrode rod and the movable side contact, and whose rim portion has a step portion to be arranged apart from the back of the movable side contact.