Electrical conductor with a surrounding electrical insulation.

摘要

Electrical conductor (10) with a surrounding electrical insulation (11) in the form of an organic polymer containing at least 10 per cent by volume of a powdered filler in the form of chromium oxide (Cr2O3), iron oxide (Fe2O3) with an intrinsic resistivity of 10<4> -10<8> ohm m, metal phthalocyanine, or a mixture of at least two of said substances. The filler in superficially located parts of the insulation protects the underlying parts of the insulation against degradation caused by corona. The chromium oxide and metal phthalocyanine preferably have an intrinsic resistivity of 10<4>-10<8> ohm m and the insulation (11) preferably a resistivity in excess of 10<1><0> ohm m. The conductor may, inter alia, be used in windings and coils for electrical machines.