H - Electricity – 04 – B
Patent
H - Electricity
04
B
317/12.4
H04B 15/00 (2006.01) H02H 9/06 (2006.01)
Patent
CA 1295008
ABSTRACT OF THE DISCLOSURE The invention relates to a device for establishing such a galvanic connection between conductors of a first batch and conductors of a second batch that on the one hand signal transmission between the two batches can take place undisturbed, and on the other hand transmission consequent on inducing electro-magnetic radiation will be blocked in two respects. High voltage induced in the conductors of the first batch consequent on high-energetic radiation, which manifests itself as a pulse, is reduced in stages to a relatively low residual voltage on the conductors of the second batch. Besides voltages induced either in the conductors of the first batch or in the conductors of the second batch, consequent on electromagnetic radiation having a signal character, are strongly reduced, in such a way that the conductors of the relevant other batch (either the second or the first) will not cause a detectable corresponding radiation. For that purpose an LD-filter configuration with one or two T-sections connected in cascade has been connected between each pair of corresponding conductors. In one of these T-sections a coil, which also forms part of a high-voltage reducing section, has been utilized. The device is mounted in a housing, which blocks electromagnetic radiation and can be fixed to a wall of a Faraday cage room in such a way that an opening in that wall will be closed. In this manner electric conductors extending to the interior of the Faraday cage room can be connected, in the desired way, to electric conductors establishing a connection with the outer world.
528921
Fetherstonhaugh & Co.
Palm Michiel
Staat Der Nederlanden (staatsbedrijf Der Posterijen Telegrafie En Telefonie)
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