Electrical insulating material comprising an insulating...

Details Electrical insulating material comprising an insulating... Electrical insulating material comprising an insulating...

H - Electricity

01

B

117/183

H01B 7/28 (2006.01) C08K 3/22 (2006.01) H01B 3/30 (2006.01)

Patent

CA 1329519

16 ABSTRACT A tape-formed or sheet-formed insulating material compri- sing an insulating section in t he form of a homogeneous film of an organic polymer or in the form of a felt of a paper of fibres of an organic polymer. The insulating layer is coated at least on one side with a protective layer which protects the insulating layer against degradation caused by corona and which comprises an organic polymer containing at least 10 per cent by volume of a powdered filler in the form of chromium oxide, iron oxide or a mixture of chromium oxide and iron oxide. The filler preferably has an intrinsic resistivity of 104-108 ohm m. The thickness of the protective layer and the total thick- ness of the protective layer, respectively, are preferably smaller than the thickness of the insulating layer and the re- sistivity of the protective layer is preferably in excess of 1010 ohm m, The tape-formed and sheet-formed insulating material may, among other things, be used in windings and coils for elec- trical machines.

562221

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