Asea Brown Boveri Ab

Abb Atom Ab

Lennart Johansson

Goran Holmstrom

Arne Hjortsberg

Thommy Karlsson

Jan Bergman

Electric conductor with insulation

The invention relates to a fuel assembly (1) for a nuclear reactor and comprises a number of parallel fuel rods (2) which are held together by means of spacers (4,5) arranged along the fuel rods as well as guide tubes (3) arranged between the fuel rods (2) and parallel thereto. The guide tubes extend through the spacers (4) and are fixed between a top nozzle (6) and a bottom nozzle (7). According to the invention, bottom sleeves (8) for the guide tubes (3) are arranged in the bottom spacer (5). These bottom sleeves (8) are rigidly fixed to the bottom spacer (5) and rest against the bottom nozzle (7). Each bottom sleeve (8) is provided with a first locking member (9) for receiving a second locking member (10), arranged at the end of the respective guide tube (3), in order to rigidly lock the guide tube (3) to the bottom sleeve (8).

Fuel assembly for nuclear reactor

A tape-formed or sheet-formed insulating material for use in windings and coils of electrical machines includes an insulating layer in the 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 and a protective layer coated on at least one side of the insulating layer which protects the insulating layer against degradation caused by corona. The protective layer comprises an organic polymer containing at least 10 percent 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 10.sup.4 -10.sup.8 ohm m. The thickness of the protective layer and the total thickness of the protective layer, respectively, are preferably smaller than the thickness of the insulating layer and the resistivity of the protective layer is preferably in excess of 10.sup.10 ohm m.

Electrical insulating material comprising an insulating layer in the

An electrical conductor is provided with an electrical insulation (11) surrounding the conductor (10) and a surrounding protective layer (12) which protects the insulation against degradation caused by corona. The protective layer consists of an organic polymer containing at least 10 percent 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 10.sup.4 -10.sup.8 ohm m. The thickness of the protective layer is preferably smaller than the thickness of the underlying insulation (11) and its resistivity preferably exceeds 10.sup.10 ohm m. The conductor is used, among other things, in windings and coils for electrical machines.

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Vaster.ang.s, Sweden

Lennart Johansson