Siemens Aktiengesellschaft

Heinz-Helmut Schramm

Wilfried Kuhl

Ruediger Hess

Klaus-Peter Rolff

Wolfgang Schlenk

Kurt Muller

Leonhard Klug

Hartmut Knobloch

Wolfgang Schilling

Heribert Weber

Friedrich Richter

Peter Trentin

In a high-voltage power breaker having two rated current contact pieces and two arc contact pieces as well as an insulating nozzle, a filling body is provided, which is mounted on this insulating nozzle, surrounds the insulating nozzle in an annular shape and is composed of an electrically insulating material having a high dielectric constant, in order to influence the electric field in the isolating gap.

High-voltage power circuit breaker comprising an insulating nozzle

To check the presence of operating vacuum in vacuum switches, high voltage can be applied between the contacts at a given contact spacing and the dielectric strength can be tested. According to the invention, the procedure for vacuum monitoring is that a contact spacing (h) below the nominal stroke of the vacuum switch is selected and that the X-radiation generated at this contact spacing (h) and high voltage (U) in vacuum due to the field electron emission between the contacts by the contact surfaces acting as anode is acquired and evaluated as proof of the presence of operating vacuum inside the switching tube. This method can preferably be applied to encapsulated vacuum switching tubes, in particular to SF.sub.6 -insulated switching facilities. Associated with the vacuum switching tube (15) in the associated equipment is an X-ray detector, preferably a Geiger-Muller counter, which is connected to the high-voltage unit (25) via an evaluating circuit (30 to 50) which serves for the determination and indication of the operating vacuum and shuts off the high-voltage unit (25) to minimize the X-ray dose. Due to the X-ray emission, which is stopped long before reaching impermissible values, the presence of vacuum can be positively verified.

Method and equipment for vacuum monitoring in vacuum switching tubes

A contact arrangement for a pressurized-gas circuit braker, wherein the contact arrangement comprises a first tubular contact member and a second tubular contact member axially arranged therewith. The contact arrangement is further provided with a hollow cylinder means of ferromagnetic material which is arranged in the interior of the first tubular member and is formed from a multiplicity of laminated metal washers which are insulated from one another and are arranged axially with respect to the first tubular member.

Contact arrangement for a pressurized gas circuit breaker

A gas-insulated, high-voltage apparatus wherein arcs can develop includes an encapsulation and at least one electrical conductor made of aluminum or an alloy thereof which is held in spaced relation to the encapsulation by insulators. A surface is arranged at the conductor at locations thereof subject to the greatest arc activity. The surface faces the encapsulation and is defined by an electrically conductive, arc-resistant material. An excessive stress and endangerment of the encapsulation because of arc action is thereby prevented.

Encapsulated, gas-insulated high-voltage apparatus having increased

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Berlin, Germany

Heinz-Helmut Schramm