Abstract: A railroad vehicle includes a plurality of vehicle units, a cable, and a disconnector. In the plurality of vehicle units respective vehicles are coupled. The cable is placed astride the vehicles to connect the power supply unit of each vehicle unit. The disconnector is installed at some midpoint in the cable and electrically separates the vehicle units from one another.

Abstract: The invention is intended to provide a circuit breaker or a circuit breaker operating method enabling a current interruption action to be performed efficiently. A circuit breaker is characterized in that includes a fixed contact and a movable contact that comes in and goes out of contact with the fixed contact; a main circuit conductor that is electrically connected to the fixed contact and the movable contact; an operating mechanism including a mover configured by concatenating permanent magnets or magnetic materials alternately having opposite N and S magnetic polarities along the direction of motion axis of the movable contact and magnetic poles disposed to face the N and S magnetic polarities of the mover and wound with windings; a current detector that detects a current flowing through the main circuit conductor; and a control device that varies the amount of a current to be supplied to the windings of the magnetic poles, depending on a current value detected by the current detector.

Abstract: Provided is a reliable switch having a contact surface that is prevented from being roughened. To solve the problem, there is provided a switch including a plurality of switching units 2 and 3 each including a fixed electrode and a movable electrode that is disposed to be opposed to the fixed electrode and is closed or opened with respect to the fixed electrode, the switch being characterized in that the switching units 2 and 3 each make or break a current to be applied to the switch, the switching units 2 and 3 are electrically connected in series to each other, and the switching units 2 and 3 are each configured such that a first switching unit 3 is first closed, and then a second switching unit 2 is closed.

Abstract: An object is to provide a switchgear having a simple structure. To solve the problem, a switchgear according to the invention is characterized by having a fixed side electrode 3, a movable side electrode 4 configured to come into contact with or separate from the fixed side electrode 3, and an operating mechanism configured to allow drive force for movement of the movable side electrode 4 to be generated, wherein the operating mechanism for operating the movable side electrode 4 includes one operating mechanism, and the one operating mechanism allows the movable side electrode 4 to stop at three or more positions.

Abstract: An object is to provide a switching unit or switching gear which enhances heat radiation performance and eliminates the need for an increase in unit size. In order to solve this problem the switching unit includes a switch and insulating resin located in a way to cover the periphery of the switch, in which the switch includes a fixed electrode, a movable electrode facing the fixed electrode and moving in an axial direction to contact or leave the fixed electrode, a bus side conductor connected to one of the electrodes and connected to a bus, and a load side conductor connected to the other electrode and connected to the load. The insulating resin has fins formed in a circumferential direction on the outer surface of the insulating resin and the distance between the periphery of the switch and the bottoms of the fins is almost constant in the circumferential direction.

Abstract: The invention has an object to provide an operating device or vacuum switch which permits reduction in the overall height of the operating device and improves installation convenience. In order to solve the above problem, an operating device according to the present invention is characterized by including an electromagnet 14 located in a case 10 and fixed to the case 10 through a fixing part, a capacitor 16 located at an end in the case 10, a control board 18 located opposite to the capacitor 16 across the electromagnet 14, an auxiliary contact 34 located above the capacitor 16, a movable part to move by a magnetic force generated from the electromagnet 14, and a power transmission section to operate in conjunction with movement of the movable part. The capacitor 16 and the auxiliary contact 34 are located at heights not exceeding the height of the fixing part for fixing the electromagnet 14.

Abstract: In an electrical contact in which aggregation phases including Cu are dispersed in a matrix phase including Mo, Cr, and Cu, a maximum grain size of the aggregation phases falls in a range of 4 to 20 ?m and, when the total Cu content in the electrical contact is denoted by Wt, the Cu content in the matrix phase is expressed by C×Wt, where C ranges from 0.54 to 0.81. A process for producing an electrical contact including Mo, Cr, and Cu includes a step of compacting mixed Mo and Cr powders, thus forming a powder-compression compact and a step of making the powder-compression compact infiltrated with molten Cu.

Abstract: A switchgear including a plurality of switch units having a fixed electrode and a movable electrode; and an operating device configured to operate the movable electrode of each of the switch units, wherein the operating device is configured of one motive part and two follower parts that intermittently operate with each other, and part of each of the follower parts touches the motive part, thereby in a condition that moving force is not transmitted from the motive part to the follower part, a state of the follower part is fixed, and in a condition that the motive part shifts from an initial position to a final position, a state of one of the follower parts is allowed to transit, and a state of the other of the follower parts is changed with a delay from such state transit, thereby the switch units are driven while a time delay is produced.

Abstract: A resistor for suppressing magnetizing inrush current includes a container made of an insulating material and at least one resistive element housed in the container, the resistive element being connected to two bushings provided at the container, the outer surface of the container being coated with a conductive paint, and the paint being connected to the ground, thereby being able to be located between a cable and a switch, and being able to fix the outer surface thereof to a ground voltage level so that human contact safety is not impaired.

Abstract: A slide electricity structure according to the present invention uses grease for electrical contacts wherein contact resistance does not gradually increase even when exposed to sliding and lifetime is long, and has a silver-plated spring contact that contacts or separates by way of sliding and grease for electrical contacts that has been applied to the spring contact and contains perfluoropolyether oil having an average molecular weight between 2600 and 12500 as a base oil and PTFE having a primary particle diameter of 1 ?m or less as a thickener.

Abstract: The present invention provides a railroad vehicle which makes it possible: not only to separate a high-voltage cable involving a point of problem and sound high-voltage cables from each other without an operator climbing onto the roof of a vehicle; but also to automatically conduct the separating work without necessity for any special work. The railroad vehicle of the present invention is formed by dispersedly mounting a plurality of vehicles with main power devices that are supplied with power from a power supply line through a pantograph and constitute power supply units. The railroad vehicle includes: a plurality of vehicle units in which respective vehicles are coupled; a cable placed astride the vehicles to connect the power supply unit of each vehicle unit; and a disconnector that is installed at some midpoint in the cable and electrically separates the vehicle units from one another.

Abstract: The invention has an object to provide an operating device or vacuum switch which permits reduction in the overall height of the operating device and improves installation convenience. In order to solve the above problem, an operating device according to the present invention is characterized by including an electromagnet 14 located in a case 10 and fixed to the case 10 through a fixing part, a capacitor 16 located at an end in the case 10, a control board 18 located opposite to the capacitor 16 across the electromagnet 14, an auxiliary contact 34 located above the capacitor 16, a movable part to move by a magnetic force generated from the electromagnet 14, and a power transmission section to operate in conjunction with movement of the movable part. The capacitor 16 and the auxiliary contact 34 are located at heights not exceeding the height of the fixing part for fixing the electromagnet 14.

Abstract: An actuator for a contactor comprises an electromagnet having a closing coil, a holding coil, fixed cores wound with the closing coil and the holding coil respectively, a movable core provided on one side of the fixed cores, and a yoke. A main contact movable member operates to perform closing or interrupting by attraction or release of the movable core with respect to the fixed core. The actuator has a trip spring, energy-stored during the closing, that performs the interrupting upon stopping energization to the holding coil and thereby releasing the stored-energy. The actuator has an auxiliary contact operating with the operation of the movable core and performing energization switching with respect to the closing coil and the holding coil. The trip spring is provided on one side of the electromagnet in a horizontal direction while the auxiliary contact is provided on the other side.

Abstract: Provided is a reliable switch having a contact surface that is prevented from being roughened. To solve the problem, there is provided a switch including a plurality of switching units 2 and 3 each including a fixed electrode and a movable electrode that is disposed to be opposed to the fixed electrode and is closed or opened with respect to the fixed electrode, the switch being characterized in that the switching units 2 and 3 each make or break a current to be applied to the switch, the switching units 2 and 3 are electrically connected in series to each other, and the switching units 2 and 3 are each configured such that a first switching unit 3 is first closed, and then a second switching unit 2 is closed.

Abstract: The object of the present invention is to provide a reliability-improved operation device, vacuum opening/closing device, and method for assembling an operation device. In order to attain the above-mentioned object, the operation device includes an electromagnet 40 generating operation power, a movable rod capable of being moved by the operation power generated from the electromagnet 40, a support member having a stopper member stopping the movement of the movable rod, a condenser 11 supplying electric current to the electromagnet 40, a control board 10, and a casing 1 housing the electromagnet 40, the support member, the condenser 11, and the control board 10 therein, the support member being fixed to a surface in the casing 1 which is different from surfaces of the casing onto which the condenser 11 and the control board 10 are fixed.

Abstract: An object is to provide a switchgear having a simple structure. To solve the problem, a switchgear according to the invention is characterized by having a fixed side electrode 3, a movable side electrode 4 configured to come into contact with or separate from the fixed side electrode 3, and an operating mechanism configured to allow drive force for movement of the movable side electrode 4 to be generated, wherein the operating mechanism for operating the movable side electrode 4 includes one operating mechanism, and the one operating mechanism allows the movable side electrode 4 to stop at three or more positions.

Abstract: The present invention has an object to provide a switchgear capable of improving workability and a switchgear assembling method. The switchgear according to the present invention has: a plurality of switch units 2, 3, 4, 5 having a movable electrode horizontally driven and brought into contact with or opened from a stationary electrode; a plurality of operation mechanisms 8, 9 that operate the movable electrodes in the plurality of switch units 2, 3, 4, 5; connection members 13, 14 provided in the switch units 2, 3, 4, 5 and connected to buses A, B; and a casing that includes all the connection members 13, 14, the plurality of switch units 2, 3, 4, 5, and the plurality of operation mechanisms 8, 9. The switch units 2, 3, 4, 5 are arranged in a height direction. The plurality of operation mechanisms 8, 9 are provided on the front side or the rear side of the casing. The plurality of bus connection members 13, 14 are provided on the other side of the casing.

Abstract: An object is to provide a switching unit or switching gear which enhances heat radiation performance and eliminates the need for an increase in unit size. In order to solve this problem the switching unit includes a switch and insulating resin located in a way to cover the periphery of the switch, in which the switch includes a fixed electrode, a movable electrode facing the fixed electrode and moving in an axial direction to contact or leave the fixed electrode, a bus side conductor connected to one of the electrodes and connected to a bus, and a load side conductor connected to the other electrode and connected to the load. The insulating resin has fins formed in a circumferential direction on the outer surface of the insulating resin and the distance between the periphery of the switch and the bottoms of the fins is almost constant in the circumferential direction.

Abstract: An object is to provide a gas circuit breaker having improved reliability. To solve the above-described problem, a gas circuit breaker is characterized by having a fixed contact, a movable contact configured to come into contact with or separate from the fixed contact, an insulating enclosure internally having the fixed contact and the movable contact, the inside of the insulating enclosure being filled with an insulating gas, and an operating mechanism configured to allow drive force for movement of the movable contact to be generated, wherein the operating mechanism includes a mover including permanent magnets or magnetic bodies disposed in a direction along which the operating mechanism allows the drive force to be generated, and a magnetic pole disposed to be opposed to the mover, and having a winding.

Abstract: An object is to obtain a vacuum switch that can achieve higher insulation properties to improve reliability. In a vacuum switch for interrupting a single-phase alternating current, three vacuum valves (VI) for a three-phase alternating current are coupled together in series. Specifically, the three vacuum valves for a three-phase alternating current are coupled together in such a manner that the current flows through adjacent vacuum valves in the same direction or in such a manner that the current flows through adjacent vacuum valves in different directions.