Siemens Aktiengesellschaft

Wilfried Haas

Hans Krueger

Werner Hartmann

Wolfgang Welsch

Heinz Hacker

Norbert Wenzel

Harald Kurzmann

Hubert Grosse-Wilde

Hans-Georg Hauschildt

J&ouml;rg Kieser

In switchgear with superordinate power circuit-breakers and a plurality of subordinate power circuit-breakers, the superordinate power circuit-breaker must be triggered in the event of failure of the subordinate power circuit-breakers. This is accomplished as follows: electrical post-arc currents are detected after current zero, the electrical post-arc currents are compared with a predetermined limit value, and if the limit value is exceeded, a signal is effected for triggering the superordinate power circuit-breaker in the switchgear. This method can advantageously be implemented in particular in the case of vacuum circuit-breakers with at least one vacuum interrupter. The associated arrangement has a device which monitors the subordinate power circuit-breakers and, if appropriate, triggers the superordinate power circuit-breaker.

Process and arrangement for selective network monitoring for switchgear

A contact configuration for vacuum switches includes two mutually opposite switch parts having a predetermined radius R.sub.K. Each switch part has slots which proceed from a center and which extend outward to form a spiral contact. The contours of the slots have a variable radius with a foot which coincides with the center of the switch part. Preferably, the slots end at a recess which has a predetermined radius R.sub.I and lies at the center of the switch part or they slightly overlap the recess, where R.sub.I .apprxeq.0.25-0.33 .multidot.R.sub.K. Specific mathematical functions can be specified for the slot contours.

Contact configuration for vacuum switches

Polymer material

A method for manufacturing a stripline laser which is composed of a plurality of constituent parts assembled together with at least two of the parts being soldered to one another, characterized by the step of soldering being by a soft solder, subsequently cleaning the interior of the assembled laser by subjecting it to the influence of a plasma treatment, continuing the plasma treatment to passivate the interior surfaces of the assembled parts of the laser, and limiting the temperature of the parts joined together by the soft solder to, at most, 150.degree. during each of the plasma treatments. The method is particularly suitable for utilization to form a CO.sub.2 stripline laser, and includes adding a CO.sub.2 gas during the second or continued plasma treatment for passivating the surfaces by saturating them with CO.sub.2.

Method for manufacturing a stripline laser

A current limiter which is electrically arranged in series with a circuit breaker, the current limiter having contacts which are movable with respect to one another in an axial direction. A spring having a nonlinear characteristic is provided for producing a force which tends to counteract the motion of the contacts away from one another. While the contacts are in a closed position, the spring exerts a small closing force, thereby permitting the contacts to open by the force of overcurrent. Such opening produces an arc which causes a wall of arcing chamber to emit gas, thereby pressurizing the arcing chamber and causing further opening of the contacts. As the contacts are opened, the nonlinear spring characteristic increasingly tends to prevent the motion of the contacts, thereby reducing mechanical stress within the limiter.

Current limiter

Growing community of inventors

Erlangen, Germany

Wilfried Haas