Agence Nationale De Valorisation De La Recherche (Anvar)

Ceraver S.a.

Agence Nationale De Valorisation De La Recherche Etablissement Public De

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Raymond Catte

Pierre Dejean

Claude Huraux

Christian Mayoux

Jean Barge

Gilbert Chapelet

Laurent Pargamin

Jean Clot

Pierre Rabischong

Jean Falipou

Jean Lagasse

Andre Loubieres

Jean-Pierre Richard

An electrical insulator offering reduced sensitivity to pollution comprises a body of a glass or porcelain dielectric material with a semiconductor outside coating. This coating mainly consists of zinc oxide with at least one further metal oxide added to it to make its voltage-current characteristic non-linear, such that I=kV.sup..alpha. where I is current, V is voltage, k and .alpha. are coefficients, and the value of .alpha. is between 20 and 50. The coating is between 0.05 and 0.5 mm thick. The further metal oxide is advantageously selected from bismuth, manganese, cobalt, chromium and antimony oxides.

Electrical insulator offering reduced sensitivity to pollution

The invention relates to electrical insulators having increased resistance to partial discharges and electrical equipment comprising such electrical insulators. These electrical insulators are formed of a macromolecular material in which is incorporated a chelate which is a derivative of an organic compound of general formula: ##STR1## wherein: R is CH.sub.2 COOM or --OH,

Polymeric electrical insulators having increased resistance to partial

The invention relates to electrical insulators having increased resistance to partial discharges and electrical equipment comprising such electrical insulators. These electrical insulators are formed of a macromolecular material in which is incorporated a chelate of general formula: ##STR1## wherein: R.sub.1, R.sub.2 and R.sub.3 each represent hydrogen or a alkyl, aryl, or cycloalkyl group or a heterocyclic group containing a sulphur, oxygen or nitrogen atom, whereby said group or heterocyclic group may be substituted by one or more halogen atoms;

Electrical insulators having increased resistance to partial discharges

The invention relates to a tactile pick-up for making contact with an object and emitting signals which are representative of the deformation caused by the object. The pick-up comprises a supple layer of variable electrical conductivity as a function of its state of compression, a matrix of measuring electrodes each connected to an output lead, and a large number of conducting elements connected to an electric source fixing their potential at a determined excitation value.

Tactile pick-up

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Toulouse, France

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