| abstract |
An electrical insulation (14) comprises an organic polymer containing a powdered filler with parts with a thickness of more than 1 mm, which insulation is intended to be subjected to an electrical field strength of at least 0.5 kV/mm built up by an alternating voltage. The insulation contains a powdered filler in the form of chromium oxide (Cr₂O₃), iron oxide (Fe₂O₃), metal phthalocyanine, or a mixture of at least two substances of these kinds in such a content that the amount of the powdered filler constitutes at least 10% of the total volume of the organic polymer and the powdered filler. The electrical insulation may, inter alia, be arranged as an insulation (14) around conductor bundles (17) in coils for electrical machines, as insulation between conductor layers in layer-wound transformers, as insulation around core and windings in instrument transformers, as insulation between conductor and grounded casing in SF₆-insulated conductors, and as insulation between conductor and grounded screen in a cable. |