一种低压引线结构及变压器

Abstract

本实用新型涉及变压器技术领域，特别涉及一种低压引线结构及变压器，包括引线组件、依次排列设置的第一低压绕组、第二低压绕组和第三低压绕组；第二低压绕组与第一低压绕组或第三低压绕组的绕制方向相同；当第二低压绕组与第一低压绕组的绕制方向相同时，第二低压绕组与第三低压绕组的绕制方向相反；当第二低压绕组与第三低压绕组的绕制方向相同时，第二低压绕组与第一低压绕组的绕制方向相反；本实用新型实现缩短三个连接排的长度，降低直流电阻配置平衡的难度，提高连接排的装配效率，解决了现有引线结构中引线排的折弯次数多，且引线排与引线排之间的长度差异大，导致直流电阻严重不平衡，降低了引线排装配效率，影响变压器生产效率的问题。

Claims

1. A low voltage lead structure, characterized by, It includes a lead wire assembly, a first low-voltage winding, a second low-voltage winding, and a third low-voltage winding arranged in sequence; The second low-voltage winding is wound in the same direction as the first low-voltage winding or the third low-voltage winding; when the second low-voltage winding is wound in the same direction as the first low-voltage winding, the second low-voltage winding is wound in the opposite direction to the third low-voltage winding; when the second low-voltage winding is wound in the same direction as the third low-voltage winding, the second low-voltage winding is wound in the opposite direction to the first low-voltage winding. The lead assembly is disposed above the first low-voltage winding, the second low-voltage winding and the third low-voltage winding, and the lead assembly includes a first connecting bar, a second connecting bar and a third connecting bar; The first low-voltage winding has a first first row and a first last row, the second low-voltage winding has a second first row and a second last row, and the third low-voltage winding has a third first row and a third last row; the first connecting row is connected to the first first row and the second last row, the second connecting row is connected to the second first row and the third last row, and the third connecting row is connected to the first last row and the third first row.

2. The low voltage lead structure of claim 1, wherein, The first row has a first bend, and the first tail row has a second bend. The second first row has a third bend, and the second last row has a fourth bend; The third first row is provided with a fifth bend, and the third last row is provided with a sixth bend. The first bend and the fourth bend are located on the same plane, and the first connecting bar is connected to the first bend and the fourth bend; The third bend and the sixth bend are located on the same plane, and the second connecting row is connected to the third bend and the sixth bend; The second bend and the fifth bend are located on the same plane, and the third connecting row is connected to the second bend and the fifth bend.

3. The low voltage lead structure of claim 2, wherein, The third connecting bar, the second connecting bar, and the first connecting bar are arranged sequentially above the second low-voltage winding in a direction away from its own central axis.

4. The low voltage lead structure of claim 3, wherein, The lead assembly also includes a first flexible connector, a second flexible connector, a third flexible connector, a first sleeve, a second sleeve, and a third sleeve; The first flexible connector is connected to the first connecting block and the first sleeve; The second flexible connector is connected to the second connecting block and the second sleeve; The third flexible connector is connected to the third connecting block and the third sleeve; The first bushing, the second bushing, and the third bushing are disposed on the same side of the second low-voltage winding.

5. The low voltage lead structure of claim 4, wherein, The lead assembly also includes a zero-phase busbar, a fourth connection busbar, a fourth flexible connection busbar, and a zero-phase bushing; The second low-voltage winding has an even number of turns. One end of the zero-phase busbar is connected to half the number of turns of the second low-voltage winding. The other end of the zero-phase busbar is provided with a seventh bend, which is located between the third bend and the fourth bend. The seventh bend is connected to the fourth connecting busbar. One end of the fourth flexible connecting busbar is connected to the fourth connecting busbar, and the other end of the fourth flexible connecting busbar is connected to the zero-phase bushing. The fourth connecting busbar is located between the first connecting busbar and the second connecting busbar. The zero-phase bushing, the first bushing, the second bushing, and the third bushing are all located on the same side of the second low-voltage winding.

6. The low voltage lead structure of claim 5, wherein, The low-voltage lead structure also includes several insulating clamps; The insulating clamp is used to fix the first connecting bar and the third connecting bar together. Alternatively, the insulating clamps are used to fix the second connecting bar and the third connecting bar together. Alternatively, the insulating clamps are used to fix the first connecting bar, the second connecting bar, and the third connecting bar together. Alternatively, the insulating clamps are used to fix the second connecting bar, the third connecting bar, and the fourth connecting bar together.

7. The low voltage lead structure of claim 5, wherein, The low-voltage lead structure also includes several fastening components; The first connecting row, the first head row, the second tail row, and the first flexible connecting row are detachably connected by the fastening assembly; The second connecting row, the second first row, the third tail row, and the second flexible connecting row are detachably connected by the fastening assembly; The third connecting row, the first tail row, the third first row, and the third flexible connecting row are detachably connected by the fastening assembly; The fourth connecting row, the zero-phase row, and the fourth flexible connecting row are detachably connected by the fastening assembly.

8. The low voltage lead structure of claim 1, wherein, The first low-voltage winding, the second low-voltage winding, and the third low-voltage winding are all foil winding structures.

9. The low voltage lead structure of claim 8, wherein, The foil winding structure includes several foil layers and several insulating papers, with the insulating paper disposed between two foil layers.

10. A transformer, characterized by Includes an oil tank, an iron core, and a low-voltage lead structure as described in any one of claims 1 to 9; Both the iron core and the low-voltage lead structure are located inside the oil tank; The iron core includes three core posts arranged in sequence. The first low-voltage winding, the second low-voltage winding, and the third low-voltage winding are arranged one-to-one with the three core posts, and the first low-voltage winding, the second low-voltage winding, and the third low-voltage winding are respectively wound on the corresponding core posts.

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