Siemens Aktiengesellschaft

Siemens Aktiengesell Schaft

Ernst-Ludwig Hoene

Werner Hartmann

Gerhard Lange

Roman Renz

Horst Kippenberg

Jurgen Boy

Wilfried Kuhl

Jan Stroh

Ruediger Hess

Hans Bettge

Reiner Mueller

Klaus-Dieter Rohde

Oskar Sippekamp

J&ouml;rg Kieser

Wolfgang Schlenk

G&uuml;nter Lins

Gunther Bialkowski

For a low-pressure gas discharge switch, at least two main electrodes are arranged at least a distance d from each other, the electrodes in an arcing chamber forming a cathode and an anode of a discharge path for the low-pressure gas discharge. The gas discharge is triggered by increasing the electron density in a cathode cavity, at least the cathode in its disk-shaped area having at least one aperture, the cathode and anode apertures preferably being opposite and aligned with each other, for triggering the discharge. An arrangement generating a magnetic field superimposed on the discharge between the main electrodes ( ) are assigned to the main electrodes ( ), with which either a predominantly parallel magnetic field is generated or a predominantly perpendicular one, with regard to the direction of current in the discharge. The magnetic field generator may include slot arrangements ( &prime;) in hollow cylinders ( ), which are part of the anode ( ) and cathode ( ) configured as hollow electrodes, or may be realized in the associated current supply lines.

Low pressure gas discharge switch

Contact arrangement for vacuum switches with axial magnetic fields

A contact arrangement for a vacuum switch or vacuum circuit breaker having coaxial switch contacts with a high breaking capacity in combination with a low current chopping and with an axial magnetic field with locally different field strength being generated in the region of the switch contacts characterized by each contact member of the contact arrangement having at least one contact surface and one arc-focusing surface with that the contact surface being in a region of low field strength of the axial magnetic field and the arc-focusing surface being in a region of high field strength of the magnetic field. The contact surface is formed in an element of a low-surge material while the arc-focusing surface is formed in an element having a high breaking capacity. Due to the structural design of the contact surfaces, the breaking arc is always ignited in the region of the contact surfaces and the contact arrangement is suitable for vacuum switches with high short-circuit breaking current values.

Contact arrangement for vacuum switches

For generating an axial magnetic field, conductor loops are disposed behind the contact members in vacuum switching tubes. The terminals of these conductor loops are supported in axial direction by supporting parts having poor electrical conductivity. In order to reduce the mass of these conductor loops, it is provided that the supporting part be dimensioned such that it represents an electrical shunt to the adjoining conductor loop the electrical conductance of this shunt amounting to at least 1/4 of the electrical conductance of the conductor loop, the invention is suitable for axial field contacts comprising at least one conductor loop disposed behind the contact member.

Contact arrangement for a vacuum switching tube

A vacuum-switching tube for a vacuum switch having two poles and producing metal vapor during switching, includes a housing having a metal vessel partially defining a switching chamber and at least one high temperature-resistant insulator disposed axially of the metal vessel outside the switching chamber, the insulator having a side facing away from the switching chamber and the insulator having a relatively small axial height being at least sufficient for insulating the two poles of the vacuum switch at given voltages expected in the vacuum-switching tube during operation, fixed and movable coaxial switching contacts disposed in the switching chamber, a shaft connected to the movable contact for moving the movable contact in axial direction, a device for shielding the insulator from the metal vapor produced during switching, the shielding device defining a boundary of the switching chamber in axial direction, accordion bellows disposed outside the switching chamber and adjacent the side of the insulator facing away from the switching chamber for vacuum-tightly sealing the movable contact, and an insulating cap resting against the insulator and surrounding the insulator and the accordion bellows, the insulating cap including a guide bearing for guiding the shaft.

Vacuum-switching tube, especially for a low-voltage contactor

Overvoltage arrester having a gas-filled housing, including two overvoltage arrester electrodes disposed across from each other in the housing, a tubular insulator body spacing the overvoltage arrester electrodes apart from each other, a ring-shaped flange integral with one of the overvoltage arrester electrodes forming a first spark gap electrode, a ring-shaped metal cap forming a second spark gap electrode being superimposed on the first spark gap electrode and pressed in on the tubular insulator body, the first and second spark gap electrodes forming a spark gap having a given clearance therebetween, and a contact spring connecting the second spark gap electrode to the other of the overvoltage arrester electrodes.

Gas discharge overvoltage arrester with parallel-connected spark gap

Growing community of inventors

Berlin, Germany

Ernst-Ludwig Hoene