Abstract: The invention relates to a nonlinear electrical material with improved microvaristor filler (1?), to devices and electrical apparatuses comprising such nonlinear electrical material and to a production method thereof. According to invention, the filler (1?) comprises larger spherical particles (5) and smaller irregular particles (6) that are arranged interstitially and provide non-point-like and/or multiple contact areas (56, 56a, 56b, 66) owing to their irregular outer shape comprising edges and faces. Embodiments, among other things, relate to: spherical particles (5) being calcinated and broken-up to retain their original shape; irregular, spikly shaped, particles (6) obtained by calcinating or sintering and crushing or fracturing granules or blocks; and addition of a third filler fraction.

Abstract: The invention pertains to a dielectric bushing (1?), in particular a high-voltage bushing (1?) for an electrical high-voltage apparatus. To realize the field control in the field-stressed zone (7; 7a, 7b), at least one screening electrode (6; 6a, 6b) arranged in the interior (20) of the insulator part (2; 2a, 2b; 2c) is eliminated and replaced with a non-linear electric and/or dielectric field control element (9; 9a, 9b; 9i, 9o; 9s) on the insulator part (2; 2a, 2b; 2c) in the region of the first installation flange (4; 8).

Abstract: The surrounding body (1) serves to surround the end, a branching or a connecting point of a high-voltage cable. It has an element (3) with a nonlinear current-voltage characteristic line, which serves to control the electric field in the surrounding area. The field control element (3) contains a polymer and a filler embedded in the polymer und containing microvaristors, as well as at least a hollow body section extending along an axis (2) and designed flat, with an axially symmetrical inner surface conductive by deforming the surrounding body (1) to an outer surface of the cable. To ensure good field control in cables, which are operated at high voltages, the inner surface of the hollow body section is designed as a variation of the outer surface of the cable and in such a way that the field control in the surrounding area is achieved by altering the number of microvaristors per surface unit as a result of expansion and/or shrinking of the hollow body section after deforming.

Abstract: The invention relates to a nonlinear electrical material with improved microvaristor filler (1?), to devices and electrical apparatuses comprising such nonlinear electrical material and to a production method thereof. According to invention, the filler (1?) comprises larger spherical particles (5) and smaller irregular particles (6) that are arranged interstitially and provide non-point-like and/or multiple contact areas (56, 56a, 56b, 66) owing to their irregular outer shape comprising edges and faces. Embodiments, among other things, relate to: spherical particles (5) being calcinated and broken-up to retain their original shape; irregular, spikly shaped, particles (6) obtained by calcinating or sintering and crushing or fracturing granules or blocks; and addition of a third filler fraction.

Abstract: The invention pertains to a dielectric bushing (1?), in particular a high-voltage bushing (1?) for an electrical high-voltage apparatus. According to the invention, in order to realize the field control in the field-stressed zone (7; 7a, 7b), at least one screening electrode (6; 6a, 6b) arranged in the interior (20) of the insulator part (2; 2a, 2b; 2c) is eliminated and replaced with a non-linear electric and/or dielectric field control element (9; 9a, 9b; 9i, 9o; 9s) on the insulator part (2; 2a, 2b; 2c) in the region of the first installation flange (4; 8). Among other things, embodiments refer to: design criteria for the geometric arrangement and for the specific materials of the field control element (9; 9a, 9b; 9i, 9o; 9s), in particular various axial and radial arrangements of field control elements (9; 9a, 9b; 9i, 9o; 9s), as well as the realization of the field control element (9; 9a, 9b; 9i, 9o; 9s) in the form of a coating or of a massive element that absorbs mechanical forces.

Abstract: A composition for use as an electrical stress controlling layer (12) for use with cable joints and terminations has a non-linear V-I characteristic. The composition comprises a polymeric matrix filled with doped zinc oxide varistor powder. The particulate filler is sieved at 125 micrometers, calcined at 1100.degree. C., and lightly ground to maintain the spherical shape of the particles. More than 50% by weight of the particles have a maximum dimension between 5 and 100 micrometers.