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AssigneeABB AB
InventorsEsbjörn Eriksson, Bo Stenerhag
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A capacitor element for a power capacitor having a two foils (3, 5) of metal forming a pair of electrodes, and also films (2a, 2b, 4a, 4b) of dielectric material forming the dielectric medium of the capacitor element. The capacitor element is produced by the foils and films being arranged one on top of the other and wound to a roll, so that the capacitor element displays a first end surface where one of the foils (5) has a long edge (10) indented between two of the films (2a, 4b), and also a second end surface where the other foil (3) has a long edge (9) indented between two of the films (2b, 4a), each of which indented long edges has an edge portion (15; 16) surrounded by an elongate field equalizer (18; 19) of dielectric material surrounding the edge portion. In accordance with the invention the field equalizer (18; 19) is in the form of an elongate strip having a thickness within the interval 5-10 μm which is folded around the indented long edge (9; 10) and surrounds the latter and which extends axially through the capacitor element (1).
A capacitor element (1) for a power capacitor comprising a first foil (3) of metal material and a second foil (5) of metal material arranged to form a pair of electrodes, and also film (2a, 2b, 4a, 4b) of dielectric material arranged between the foils (3, 5) in order to form a dielectric medium, which capacitor element (1) is produced by said foils (3, 5) and films (2a, 2b, 4a, 4b) being arranged one on top of the other and wound to a roll, the capacitor element (1) displaying a first end surface (12) where the second foil (5) has a long edge (10) indented between two of said films (2a, 4b) situated adjacent to the second foil (5), and also a second and surface (13) where the first foil (3) has a long edge (9) indented between two of said films (2b, 4a) situated adjacent to the first foil (3), each of which indented long edge (9, 10) has an edge portion (15;
A power capacitor (28) comprising a plurality of capacitor elements (3) comprising a first foil (3) of metal material and a second foil (5) of metal material arranged to form a pair of electrodes, and also films (2a, 2b, 4a, 4b) of dielectrodes material arranged between the foils (3, 5) in order to form a dielectric medium, which capacitor element (1) is produced by said foils (3, 5) and films (2a, 2b, 4a, 4b) being arranged one on top of the other and around to a roll, the capacitor element (1) displaying a first and surface (12) where the second foil (5) has a long edge (10) indented between two of said films (2b, 4a) situated adjacent to the second foil (5) and also a second and surface (13) where the first foil (3) has a long edge (5) indented between two of said films (2b, 4a) situated adjacent to the first foil (3). Each of which indented long edges (9;
Dependencies are inferred from the claim text.