Abb Ab

Borealis Technology Oy

Asea Brown Boveri Ab

Abb Inc.

Peter Carstensen

Mats Leijon

Lars Gertmar

Peter Templin

Bengt Rydholm

Bertil Larsson

Claes Ivarson

Annika Smedberg

Bertil Berggren

Ulf Nilsson

Ola Fagrell

Roger Carlsson

Alfred Campus

Andreas Farkas

Gunnar Kylander

Claes Broman

Lena Lindbom

Anders Gustafsson

Sören Berggren

Erland Sörensen

Anders Ericsson

Mons Hölleland

Stefan Milton

Christian Sasse

Goran Holmstrom

Jan-Anders Nygren

Par Holmberg

Bengt Rothman

Jan-Ove Bostrom

Alberti Backlund

Jan-Ove Boström

Leif Johansson

Kenneth Johannesson

Bengt Goran

Bo Hernnäs

Hans-Olof Kalldin

Gunnar Davidsson

Jan Brangefalt

The invention relates to a semiconductive polymer composition for use in power cables. The composition comprises a multimodal ethylene homo- or copolymer produced in a polymerization process comprising a single site catalyst whereby the polymer composition has a density of 870 to 930 kg/m3, a MFR2 of 1 to 30 g/10 min and a Mw/Mn of less than or equal to 10.

Semiconductive polymer composition

A semiconductive polymer composition for use in power cables, wherein the composition has a multimodal ethylene homo- or copolymer produced in a polymerization process having a single site catalyst whereby the polymer composition has a density of 870-930 kg/m, a MFRof 1 to 30 g/10 min and a Mw/Mn of less than or equal to 10.

A rotating electrical machine and method for making the machine, where the machine includes a high-voltage stator winding and elongated support devices for supporting the winding. The machine and method employ an arrangement of cable that is made of inner conductive strands, covered with a first semiconducting layer, which is covered with an insulating layer, which is covered with a second semiconducting layer. The cable is wound in slots in the stator such that separate cable lead-throughs are positioned in specific arrangements with respect to each other and in slots of the stator. The arrangement of the cable in the stator protects the integrity of the respective components in the cable and particularly the second semiconducting layer.

Rotating electrical machine having high-voltage stator winding and elongated support devices supporting the winding and method for manufacturing the same

In a plant containing a turbo-generator the magnetic circuit of the turbo-generator is included in an electric generator which directly supplies a high supply voltage of 20-800 kV, preferably higher than 36 kV. The insulation of the generator is built up of a cable () comprising one or more current-carrying conductors () with a number of strands () surrounded by outer and inner semiconducting layers () and intermediate insulating layers (). The outer semiconducting layer () is at earth potential. The phases of the winding are Y-connected. The Y-point may be insulated and protected from over-voltage by means of surge arresters, or else the Y-point may be earthed via a suppression filter.

Turbo generator plant with a high voltage electric generator

The magnetic circuit of a generator in a hydro-generator plant is arranged to directly supply a high supply voltage of 20-800 kV, preferably higher than 36 kV. The generator is provided with solid insulation and its winding includes a cable () comprising one or more current-carrying conductors () with a number of strands () surrounded by at least one outer and one inner semiconducting layer () and intermediate insulating layers (). The outer semiconducting layer () is at earth potential. The stator winding may be produced with full or fractional slot winding, the phases of the winding being Y-connected. The Y-point may be insulated and protected from over-voltage by means of surge arresters, or else the Y-point may be earthed via a suppression filter. The invention also relates to a hydro-generator plant, a generator included in the plant and a procedure for building such a plant.

Hydro-generator plant

A power transformer having at least one high voltage winding and one low voltage winding. Each of the windings includes at least one current-carrying conductor, a first layer having semiconducting properties provided around said conductor, a solid insulating layer provided around said first layer, and a second layer having semiconducting properties provided around said insulating layer. The windings are intermixed such that turns of the high voltage winding are mixed with turns of the low voltage winding.

Transformer

An insulated conductor for high-voltage windings in electric machines employs conductor formed of one or more strands, an inner, first semi-conductive layer surrounding the strands, a first insulating layer surrounding the inner, first semi-conductive layer and an outer, second semi-conductive layer surrounding the first insulating layer. The second semi-conductive layer has at least two different earth points along the insulated conductor, the second semi-conductive layer has breaks located between consecutive earth points. A shielding device is located in each of said breaks for reducing amplification of the electric field strength produced at the breaks.

Insulated conductor for high-voltage windings and a method of manufacturing the same

A conductor and a rotating electric high-voltage machine that includes the conductor has a cable configured for high-voltage operation. The cable may be included as a winding for the rotating electric high-voltage machine. The conductor includes a first strand that is clad with an electrically insulating layer, and a second strand that is uninsulated whereas the first strand and the second strand are arranged in two or more layers of strands. The two or more layers of strands are insulated from one another. Furthermore, the first and second layers of the two or more layers of strands are arranged around a central core where the central core is at least one of an air core and a core of another material. The second strand is positioned so as not to be electrically contacting any other uninsulated strand.

Conductor for high-voltage windings and a rotating electric machine comprising a winding including the conductor

Growing community of inventors

Huddinge, Sweden

Peter Carstensen