Static electric induction system

Abstract

The invention relates to a static electric induction system comprising cooling fluid, an outer shell (12) and an inner shell (14), a coil assembly (6) comprising a plurality of coil units (16), stacked on top of one another and positioned in between the outer and inner shells (12, 14), and a plurality of coil unit spacers (20) configured to form a plurality of intermediate fluid ducts (32) between the coil units (16). The static electric induction system further comprises a first and an adjacent second sector (2, 2), each sector(2, 2) comprising a fluid guide arrangement (A, B) having a plurality of fluid guides (24, 26), whereby the vertical distance, as counted in coil units (16), between one pair of two subsequent fluid guides (24, 26) of a sector (2, 2) differs from a vertical distance, as counted in coil units (16), between another pair of two subsequent fluid guides (24, 26) of the same sector (2, 2) and wherein the first fluid guide arrangement (A) of the first sector (2) differs from the second fluid guide arrangement (B) of the second sector (2).

Description

technical field [0001] The invention relates to electrostatic induction systems, such as transformer systems, which are normally cooled by a fluid. Background technique [0002] Known electrostatic induction systems such as core transformers consist of a tank containing a body made up of cores with several current carrying windings wound around them. Electrical windings or coils are arranged between the electrically insulating cylinders. The electrical windings may be embedded or shaped as disks arranged on top of each other. The electrical winding can also be helically shaped. When the transformer is in use the disc generates heat which needs to be dissipated by a cooling fluid such as eg oil or ester based liquid. Heat reduces the life expectancy of the transformer system and therefore generally requires the transformer system to be cooled by using an efficient and robust cooling system. The disks are usually vertically spaced apart by spacers to form horizontal fluid ...

AI Technical Summary

Problems solved by technology

Due to the symmetrical arrangement of the fluid control members, hot spots may spread easily, especially in the circumferential direction of the coil unit 16, and peak temperature regions cannot be effectively cooled

[0005] Due to the generation of losses in the windings, hot spots occur which affect the aging rate of the insulation and thus the lifetime of the transformer

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