Abstract: In a vacuum interrupter comprising a disc-shaped stationary electrode and a disc-shaped movable electrode arranged in an evacuated envelope in opposed relationship. A main electrode is in electrical contact with a coil electrode having arm parts and coil parts to establish predetermined current flows when the stationary and movable electrodes separate.

Abstract: A vacuum interrupter comprising each electrode assembly of a pair of electrode assemblies having substantially the same structure and arranged in an evacuated envelope in opposed relationship adapted to be connected with or disconnected from each other. Each electrode assembly includes a coil electrode having a plurality of arms extending outwardly from a center ring shaped holding part and a plurality of arc-shaped coil parts formed substantially along the same circumference of the coil electrode and connected to respective ones of the arms, a main electrode including an arc-shaped arm electrically connected to each arc-shaped coil part of the coil electrode, the coil parts being in contact with corresponding ones of the arc-shaped arms along entire surfaces thereof, and a first arm connected to each of the arc-shaped arms of the main electrode and extended substantially toward a center of the main electrode in the radial direction.

Abstract: The present invention is directed to a high current density glow discharge switch which is capable of preventing confinement of an electron current to the vicinity of the center of a flat electrode during the operation of the switch to prevent an increase in the temperature of the flat electrode and thereby provide a highly reliable and stable switch having a long lifetime. A cathode and an anode each include a flat electrode having a central hole and a cup-shaped electrode electrically connected to the flat electrode. The cathode and the anode are disposed such that the flat electrodes face each other. A cylindrical insulator is disposed on the outside of the cathode and the anode. A coil for generating a magnetic field is disposed on the outside of the cylindrical insulator. Hydrogen gas is sealed in a sealed space defined by the cylindrical insulator, the cathode and the anode.

Abstract: In a vacuum interrupter comprising a disc-shaped stationary electrode and a disc-shaped movable electrode arranged in an evacuated envelope in opposed relationship, a slot or a salient part is formed on the surface of both the electrodes and thereby a path of an arc current in disconnection operation of both the electrodes is formed along the circumference of the disc-shaped electrode. The shape and position of the slot is selected so that the arc current flows uniformly along the entire circumference of both the electrodes.

Abstract: An electromagnetic rail launcher adapted to accelerate a projectile by an electromagnetic force which comprises:a plurality of rail-like electrodes; andan armature being installed so as to shortcircuit the plurality of rail-like electrodes;at least one of said plurality of electrodes being consisted of a first conductive part which contacts with the armature and a second conductive part which is electrically insulated with the first conductive part;said first conductive part being segmented in a plurality of segmented first conductive parts which are insulated with each other, in an acceleration direction of the projectile;each of said plurality of the segmented first conductive parts having at least one hole through which the first conductive part and the second conductive part are bridged by an arc, when a current flows in the second conductive part.

Abstract: A system for foreseeing deterioration in interrupting a performance of a vacuum interrupter, including a first measuring component for measuring potentials of electric lines connected to fixed and movable electrodes of the vacuum interrupter; a second measuring component for measuring a potential of an arc shield; a signal transmitting section for the transmission of potential signals resulting from the measurements in the first and second measuring component; a comparing section for making a comparison between the measured signal from the first measuring component and the measured signal from the second measuring component both transmitted through the signal transmitting section; and a judging section for judging that the fixed and movable electrodes have been deteriorated in their interrupting performance, on the basis of the result of the comparison made in the comparing section.

Abstract: An apparatus for generating negatively charged species has a cathode and an anode which are disposed in a vacuum vessel facing each other. A constricted arc having a sufficiently large arc current is generated in an arc space between the anode and the cathode, thereby generating negatively charged species of various types of metals, semiconductors, and gases.

Abstract: A vacuum interrupter in which at least one of a pair of electrodes is provided with first high resistance areas formed passing through from a contact surface to a back side thereof at specified distances from a peripheral edge of the electrode and facing to each other and second high resistance areas extending from ends of the first high resistance areas toward a center of said electrode being not connected to each other, and in which outside parts of the electrode between the first high resistance areas and the peripheral edge is electrically connected to a conductive rod on the back side of the electrode by way of a bridge conductor arranged over the first high resistance areas.

Abstract: In a spot welder in which the electric charge stored in an electrolytic capacitor (1a) is discharged through a welding circuit 3 to perform a welding operation, in order to prevent the lowering of the welding performance due to the inversion in polarity of the voltage of the electrolytic capacitor (1a), its main circuit includes another electrolytic capacitor (1b) which is connected in series to a DC source (5) and shunted by a resistor (7) and which is substantially equal in capacitance to the aforementioned electrolytic capacitor (1a), and after the electrolytic capacitor (1a) only is charged, a switch (2) is turned on so that the charge current of the electrolytic capacitor (1a) is discharged to charge the electrolytic capacitor (1b), whereby charging the electrolytic capacitors (1a) and (1b) in opposite directions is prevented.