Body insulation structure of dry-type transformer with three-dimensional rolled iron core and manufacturing process thereof
A dry-type transformer, three-dimensional technology, applied in the direction of transformer/inductor coil/winding/connection, coil manufacturing, etc., can solve the problem of uneven force on the insulation coil of the body, improve stability and resist sudden short circuit Ability, uniform force, the effect of reducing manufacturing cost
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[0015] Example 1: Three-dimensional wound dry core transformer, stays fixed on low voltage coil
[0016] See figure 1 The insulator body structure of this embodiment consists of a three-dimensional three-dimensional wound core 1, a high-voltage coil 2, a low-voltage coil 3, an insulating sheet 4, a prepreg insulating material 5, a stay 6, a soft cushion block 7, which supports and compresses the coil, and The spacer 8 and the pressing screw 9 are formed. After the transformer core is completed, the low-voltage coil is wound with special winding equipment, and then the insulating sheet 4 and the prepreg insulating material 5 are supported and fixed on the low-voltage coil by the brace 6 to form an insulating cylinder or insulating sheet 4, and the prepreg insulating material 5 passes The stay is fixed on the high-voltage coil to form an insulating cylinder. In the former, after the low-voltage coil is wound, the insulating sheet 4 and the prepreg insulating material 5 are wound o...
Example Embodiment
[0018] Example 2: Dry-type transformer with non-encapsulated (pie-type) coil
[0019] See figure 2 In this embodiment, before the high-voltage coil is wound, the insulating sheet 4 and the prepreg insulating material 5 are wound on the winding die to form an insulating cylinder, and then the high-voltage coil is wound by the stay, which is generally used for non-encapsulated (cake-type) coils On the dry-type transformer. The prepreg material 5 may be a semi-cured resin-impregnated insulating paper or cloth with the same width as an insulating cylinder, or may be a semi-cured resin-impregnated insulating tape with a certain width. The other structure is the same as the first embodiment.
[0020] The invention is also suitable for other types of oil-immersed transformers. The structure of the insulating cylinder is also suitable for planar wound core transformers.
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