CN-224232435-U - Insulating assembly structure of transformer press nail

Abstract

The utility model relates to a transformer press nail insulation assembly structure which comprises a press nail, a press nail gasket and an insulation layer, wherein a groove is formed in the press nail gasket, a plug hole is formed in the bottom of the groove, a limit section propped against the bottom of the groove is arranged at the lower end of the press nail, a plug section inserted into the plug hole is arranged at the lower end of the limit section, the end face of the lower end of the plug section is flush with the lower surface of the press nail gasket, a bonding wire is formed between the end face of the lower end of the plug section and the lower surface of the press nail gasket, and the insulation layer is arranged on the rest part outside the press nail gasket except the groove. The utility model can ensure that no virtual connection between the press nails and the press nail gaskets can generate suspension potential, and has simple structure, convenient processing and reliable insulating property.

Inventors

• GAO DAN

Assignees

• 特变电工沈阳变压器集团有限公司

Dates

Publication Date

20260512

Application Date

20250422

Claims (4)

1. 1. The transformer nail pressing insulation assembly structure is characterized by comprising a nail pressing (1), a nail pressing gasket (2) and an insulation layer (3), wherein a groove (201) is formed in the nail pressing gasket (2), an inserting hole (204) is formed in the bottom of the groove (201), a limiting section (102) propped against the bottom of the groove (201) is arranged at the lower end of the nail pressing (1), an inserting section (101) inserted into the inserting hole (204) is arranged at the lower end of the limiting section (102), the end face of the lower end of the inserting section (101) is flush with the lower surface of the nail pressing gasket (2), a welding wire (4) is formed between the end face of the lower end of the inserting section (101) and the lower surface of the nail pressing gasket (2), and the insulation layer (3) is arranged on the other parts, except the groove (201), of the outer side of the nail pressing gasket (2).
2. 2. The transformer nail pressing insulation assembly structure of claim 1, wherein an upper round corner (202) of the nail pressing gasket is arranged on the outer side of the upper end of the nail pressing gasket (2), a lower round corner (203) of the nail pressing gasket is arranged on the outer side of the lower end of the nail pressing gasket, a first insulating layer round corner section (301) and a second insulating layer round corner section (302) which are sequentially connected from inside to outside are formed at positions of the insulating layer (3) corresponding to the upper round corner (202) of the nail pressing gasket, and a third insulating layer round corner section (303) is formed at positions of the insulating layer (3) corresponding to the lower round corner (203) of the nail pressing gasket.
3. 3. The transformer press-stud insulation assembly structure according to claim 2, wherein the insulation layer (3) is formed by hanging paper pulp on the rest outside the press-stud washer (2) except the groove (201) after the lower side of the press-stud washer (2) is ground down together with the bonding wires (4).
4. 4. The transformer press-stud insulation assembly structure according to claim 1, wherein the press stud (1) comprises a threaded section (103), a limiting section (102) and a plugging section (101) which are sequentially arranged and sequentially reduced in diameter.

Description

Insulating assembly structure of transformer press nail Technical Field The utility model relates to the field of transformer press nails, in particular to an insulating assembly structure of a transformer press nail. Background With the increasing voltage level of transformer products, how to improve the insulation reliability of the transformer is a problem to be considered, wherein for a transformer adopting a press-pin pressing body structure, an electric field around the press pin is a key consideration part for improving the insulation reliability of the transformer, because the press pin is a ground electrode, and in a high-field-intensity region, any distortion of electric field distribution of the press pin part may cause collapse of the whole insulation structure. In the prior art, the press nails extend into the bowl-shaped press nail washers, the press nails are tightly pressed by propping against the press nail washers, the press nails and the press nail washers are of a separation structure, and virtual connection between the press nails and the press nail washers easily occurs to generate suspension potential, so that the problem of partial discharge is caused. For example, the background art of CN204720298U discloses a conventional press-nail structure, which comprises an upper cushion block, a press bowl (i.e. a press-nail washer), a press-nail, etc., after the coil is sleeved, the upper cushion block is placed first, then the press bowl is placed in a groove of the upper cushion block, then the press-nail is screwed into a press-nail nut and presses against the press bowl to apply pressure to the coil, while the improvement of CN204720298U is that the press-nail structure uses a press bolt to replace the press-nail, and uses a press plate to replace the press bowl, but the press bolt and the press plate are still in a separated structure, which cannot completely ensure that no virtual connection occurs between the press bolt and the press plate. Also disclosed in CN215600227U patent, a pressing structure is provided with a disc (i.e. pressing nail washer) at the end of the pressing nail for pressing against the pressing nail cushion block to improve the uniformity of the electric field, and meanwhile, the contact area between the pressing nail and the pressing nail cushion block is increased, so as to improve the stress uniformity of the transformer. However, the end face of the end part of the press pin in the structure is usually welded and fixedly connected with the groove bottom of the groove in the middle of the disc, the defect of the mode is that the requirement on a welding line is higher, the welding line cannot exceed the upper end face of the disc, otherwise, the welding line is exposed to cause the problem of poor insulativity and the like, but the processing of the welding line in the groove is time-consuming and labor-consuming in actual production due to the limitation of the size of the disc and the depth of the groove in the middle of the disc, the production efficiency is greatly reduced, and meanwhile, the phenomenon that virtual connection between the press pin and the disc cannot be ensured. Disclosure of utility model The utility model aims to provide a transformer press nail insulation assembly structure which can ensure that no virtual connection between a press nail and a press nail gasket can generate suspension potential, and has the advantages of simple structure, convenient processing and reliable insulation performance. The aim of the utility model is realized by the following technical scheme: The utility model provides a transformer presses insulating assembly structure of nail, includes presses nail, presses nail packing ring and insulating layer, wherein is equipped with the recess on pressing the nail packing ring, the tank bottom of recess is equipped with the spliced eye, press the nail lower extreme be equipped with the spacing section that the recess tank bottom offset, spacing section lower extreme is equipped with and inserts the grafting section of spliced eye, and grafting section lower extreme terminal surface with press nail packing ring lower surface parallel and level, grafting section lower extreme terminal surface with press and form the bonding wire between the nail packing ring lower surface, press the nail packing ring outside except the rest of recess all is equipped with the insulating layer. The nail pressing gasket comprises a nail pressing gasket body, and is characterized in that a nail pressing gasket upper round corner is arranged on the outer side of the upper end of the nail pressing gasket body, a nail pressing gasket lower round corner is arranged on the outer side of the lower end of the nail pressing gasket body, the insulating layer corresponds to a first insulating layer round corner section and a second insulating layer round corner section which are sequentially connected from inside to outside, and the insulating layer