A low-voltage coil for dry-type transformers
A dry-type transformer and low-voltage coil technology, applied in the field of transformers, can solve problems such as difficult to pull out, high temperature requirements, cumbersome, etc., and achieve the effect of cost saving and satisfactory mechanical strength
Inactive Publication Date: 2015-08-26
CHANGSHU CHANGYUAN TRANSFORMER
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Problems solved by technology
This process is very cumbersome, and the temperature requirement is very high when pulling out the inner mold and airway plate, and it is difficult to pull out when the temperature is not appropriate
Method used
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[0014] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.
[0015] see figure 1 and figure 2 , the embodiment of the present invention includes:
[0016] A low-voltage coil for a dry-type transformer, comprising a conductive layer 11, an insulating layer 12, an inner insulating layer 13, an outer insulating layer 14, an upper insulating end 15, a lower insulating end 16, an air gap strut 17 and an inner connecting row 18.
[0017] The conductive layer 11 and the insulating layer 12 are preferably sheet-like structures, and the conductive layer 11 and the insulating layer 12 are wound one by one to form a multi-turn winding (not marked); the adjacent two layers are conductive One or more layers of insul...
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The invention discloses a low voltage coil for a dry-type transformer. The coil comprises a multi-turn winding wound by conductive layers and insulation layers; the adjacent conductive layers are separated by at least one layer of insulation layer; the surface of the insulation layer comprises at least one layer of resin insulation layer; the low voltage coil further comprises an internal insulation layer and an external insulation layer located in the internal surface and external surface of the winding; the internal surfaces of the internal and external insulation layers are provided with a resin insulation layer; two ends of the internal insulation layer and the external insulation layer are higher than the winding; and the low voltage coil further comprises insulation ends which are arranged at two ends of the winding and located between the internal insulation layer and the external insulation layer. According to the low voltage coil for the dry-type transformer provided by the invention, after the coil is wound, the coil can be used only by drying and end sealing; with the adoption of new technique and new insulation material, no pouring is required, thus, the cost is saved; the coil is reliable after operation for years, the coil is not wetted, and the mechanical strength of the coil can meet the requirement.
Description
technical field [0001] The invention relates to the field of transformers, in particular to a low-voltage coil for a dry-type transformer. Background technique [0002] Compared with oil-immersed transformers, dry-type transformers are transformers in which the core and windings are not immersed in insulating liquid, and are generally used for local lighting and electronic circuits. As an important part of dry-type transformer: low-voltage coil, the traditional manufacturing process of the low-voltage coil adopts casting process: the coil is wound on a special inner mold, after the winding is completed, the outer mold and upper and lower end plates are installed, and the vacuum casting The tank is filled with resin, and then it is cured in a curing furnace. After the temperature drops, the outer mold and upper end plate are removed, and finally the inner mold is pulled out. This process is very cumbersome, and the temperature requirements for pulling out the inner mold and ...
Claims
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IPC IPC(8): H01F27/32H01F27/30H01F27/29
Inventor 俞文明王建林冯向军
Owner CHANGSHU CHANGYUAN TRANSFORMER