Asea Brown Boveri Inc.

Bbc Brown Boveri Ag

Dietrich Konigstein

Diethard Hansen

Heyno Garbe

Dieter Koster

An electrical system contains two current-fed components having respective grounded housings. Each of these components is connected via a respective conductor to a common ground point. A signal-transmitting connection galvanically connects the housings two components to each other. A parasitic-current indicator is permanently installed in the system and detects parasitic currents (I.sub.S) flowing between the grounded housings and generates a warning at a predetermined signal level.

Parasitic-ground current indicator for electrical system

A reflection-free termination of a TEM waveguide, in which a TEM wave is conducted through an inner conductor (4) and an outer conductor (1) and is absorbed at one end of the TEM waveguide by an RF absorber (5) for absorbing a field energy and by an ohmic line termination (7) for absorbing a conductor-guided energy of the TEM wave, is constructed in such a manner that the line termination (7) is located in a plane determined by the inner conductor (4) and located in the wave direction. The line termination (7) is constructed as an ohmic resistance which produces a gradual, serial damping on the inner conductor (4) and locally compensates for a capacitance loading additionally produced at the line termination (7) by the RF absorbers.

Reflection-free termination of a TEM waveguide

A process for manufacturing a cylindrical body and a device for carrying out the process. With this process, in particular sample bodies of absorbents are obtained. The intention with this process is that the nature of the bodies taken is not falsified. A device, which allows this process to be carried out rationally, is to be specified. This is achieved by the fact that firstly a plane-parallel board (1) is cut out of the material, which board (1) is provided with a guide opening (4a). Inserted into the guide opening (4a) is a guide part (5) which guides a cutting element (9) concentrically to the said guide opening (4a), which cutting element (9) separates a sleeve-shaped body (13). This body (13) is then introduced into a measurement device.

Process for manufacturing a cylindrical body and a device for carrying

The present invention relates to a generator concept by means of which, in particular, the effects of so-called nuclear electromagnetic pulses on electrical or electronic devices can be simulated by applying the so-called current injection technique. In the context of the generator concept according to the invention, in particular, a pneumatically controllable very fast spark gap is disclosed. Furthermore, a generator circuit having two spark gaps (40, 41) is disclosed which is capable of generating a voltage pulse having an amplitude which is four times as large as the voltage of its voltage supply. With the exception of the spark gaps, the components 42-49) of the generator circuit only need to be designed for the above voltage of the voltage supply with respect to their continuous loading. The generator circuit according to the invention, in particular in conjunction with the spark gap according to the invention, allows a very fast efficient pulse generator to be constructed.

Emp generator

The device according to the invention exhibits a TEM waveguide (1), which opens out in a pyramid shape and which is closed by a wall (7) of high-frequency peak absorbers (7.1) and which exhibits an asymmetrically disposed, plate-shaped inner line (6), which is connected to a plurality of terminal resistors (8.1, 8.2, 8.3) through the absorber wall (7). The TEM waveguide (1) further exhibits a closed outer line (5). The absorber wall (7) is curved in the manner of a spherical segment, the center of curvature being situated in the region of the tip (2) of the pyramid-shaped TEM waveguide (1).

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Gebenstorf, Switzerland

Dietrich Konigstein