Siemens Aktiengesellschaft

Siemens Aktiengesell Schaft

J&ouml;rg Kieser

Werner Hartmann

Jan Stroh

Ernst-Ludwig Hoene

Harald Kurzmann

Wilfried Haas

Klaus-Dieter Rohde

G&uuml;nter Lins

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

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

Growing community of inventors

Forchheim, Germany

Jörg Kieser

Growing community of inventors

Forchheim, Germany

J&ouml;rg Kieser

Jörg Kieser