CN-122025374-A - Low-voltage outgoing lead structure of new energy high-capacity amorphous three-dimensional winding transformer

Abstract

The invention provides a low-voltage outlet lead structure of a new energy high-capacity amorphous three-dimensional winding transformer, which comprises a lead body, wherein the lead body comprises at least one multi-layer composite conductive bar led out from the outlet end of each group of low-voltage winding on the amorphous three-dimensional winding transformer, and the free ends of the multi-layer composite conductive bars are connected to corresponding low-voltage sleeve wiring terminals.

Inventors

• XIE XIAOJUN
• LI JIADONG
• LIU WEIJUN
• Cao Tianfei
• Gao Gun
• Ma Ningchao
• SUN CHUYUAN

Assignees

• 西安热工研究院有限公司
• 华能陕西发电有限公司
• 华能陕西发电有限公司新能源分公司
• 华能陕西榆阳电力有限公司

Dates

Publication Date

20260512

Application Date

20260326

Claims (10)

1. 1. The low-voltage outgoing lead structure of the new energy high-capacity amorphous three-dimensional winding transformer is characterized by comprising a lead body, wherein the lead body comprises at least one multi-layer composite conductive bar led out from the outgoing end of each group of low-voltage winding on the amorphous three-dimensional winding transformer, and the free ends of the multi-layer composite conductive bars are connected to corresponding low-voltage sleeve wiring terminals.
2. 2. The low-voltage outgoing lead structure of the new energy high-capacity amorphous three-dimensional winding transformer according to claim 1, wherein three-phase multi-layer composite conductive bars are uniformly distributed along the circumferential direction.
3. 3. The low-voltage outgoing lead structure of the new energy high-capacity amorphous three-dimensional rolled transformer according to claim 1, wherein the outer side of each phase of the multi-layer composite electric conduction row is coated with a heat conduction insulating layer.
4. 4. The low-voltage outgoing lead structure of the new energy high-capacity amorphous three-dimensional rolled transformer according to claim 3, wherein the surface of the heat conducting and insulating layer is provided with axial radiating fins.
5. 5. The low-voltage outgoing lead structure of the new energy high-capacity amorphous three-dimensional winding transformer according to claim 1, wherein a plurality of multi-layer composite conductive bars led out from the outgoing end of each phase of low-voltage winding are arranged in a fan shape.
6. 6. The low-voltage outgoing lead structure of the new energy high-capacity amorphous three-dimensional winding transformer according to claim 5, wherein the angle of fanning out the plurality of the multi-layer composite conductive bars is 30-60 degrees.
7. 7. The low-voltage outgoing lead structure of the new energy high-capacity amorphous three-dimensional rolled transformer according to claim 1, wherein the multi-layer composite conductive bar comprises a plurality of copper sheets which are stacked up and down in parallel, an insulating film is arranged between two adjacent copper sheets, and all the copper sheets are connected in parallel.
8. 8. The low-voltage outgoing lead structure of the new energy high-capacity amorphous three-dimensional winding transformer according to claim 1, wherein the multi-layer composite conductive bars are welded with the low-voltage winding outgoing lead.
9. 9. The low-voltage outgoing lead structure of the new energy high-capacity amorphous three-dimensional rolled transformer according to claim 1, wherein the multi-layer composite conductive bars are flexibly connected with the low-voltage sleeve wiring terminals.
10. 10. The low-voltage outgoing lead structure of the new energy high-capacity amorphous three-dimensional rolled transformer according to claim 1, wherein a magnetic shielding plate is arranged around the lead body.

Description

Low-voltage outgoing lead structure of new energy high-capacity amorphous three-dimensional winding transformer Technical Field The invention belongs to the technical field of power transformers, and particularly relates to a low-voltage outgoing lead structure of a new energy high-capacity amorphous three-dimensional winding transformer. Background With the promotion of the 'double carbon' target, the installed capacity of new energy power generation is rapidly increased, and higher requirements are put on matched power equipment. The amorphous alloy three-dimensional wound core transformer is widely applied to new energy grid-connected substations due to the advantages of low no-load loss, remarkable energy-saving effect, symmetrical three-phase magnetic circuits and the like. However, in the application scenario of large capacity (often referred to as 1600kVA and above), the low-side current is extremely large, and the following problems exist in the conventional lead mode: The lead wire has high electric density and exceeds the standard of temperature rise, namely the local hot spot is obvious under the condition of high current in the conventional copper bar or cable lead-out mode, and insulation aging is easy to cause; The space layout is limited, the amorphous three-dimensional wound iron core is in a three-dimensional symmetrical structure, the internal space is compact, and the traditional leads are difficult to reasonably arrange; if the high-current leads are not effectively shielded or symmetrically arranged, eddy current loss is easy to generate in the iron core and the clamping piece; the assembly process is complex, the existing leads are mostly welded or connected by bolts, the field installation is difficult, and the reliability is poor. Therefore, a low-voltage outgoing lead mode which is reasonable in structure, good in heat dissipation, strong in electromagnetic compatibility and convenient to assemble is needed to meet the operation requirement of the new energy high-capacity amorphous three-dimensional coil transformer. Disclosure of Invention The invention aims to provide a low-voltage outgoing lead structure of a new energy high-capacity amorphous three-dimensional coil transformer, which solves the problems of high lead temperature, large space occupation, strong electromagnetic interference, difficult assembly and the like in the prior art. In order to achieve the above purpose, the invention adopts the following technical scheme: the invention provides a low-voltage outlet lead structure of a new energy high-capacity amorphous three-dimensional winding transformer, which comprises a lead body, wherein the lead body comprises at least one multi-layer composite conductive bar led out from the outlet end of each group of low-voltage winding on the amorphous three-dimensional winding transformer, and the free ends of the multi-layer composite conductive bars are connected to corresponding low-voltage sleeve wiring terminals. Preferably, the three-phase multi-layer composite conductive bars are uniformly distributed along the circumferential direction. Preferably, the outer side of each phase of the multilayer composite electric conduction row is coated with a heat conduction insulating layer. Preferably, the surface of the heat conducting and insulating layer is provided with axial radiating fins. Preferably, a plurality of multi-layer composite conductive bars led out from the head end of each phase of low-voltage winding are arranged in a fan shape. Preferably, the angle at which the plurality of the multi-layer composite conductive bars fan out is 30 ° -60 °. Preferably, the multi-layer composite conductive bar comprises a plurality of copper sheets which are stacked up and down in parallel, an insulating film is arranged between two adjacent copper sheets, and each copper sheet is connected in parallel. Preferably, the multi-layer composite conductive bars are welded with the low-voltage winding heads. Preferably, the multi-layer composite conductive bars are flexibly connected with the low-voltage sleeve wiring terminals. Preferably, a magnetic shield panel is provided around the lead body Compared with the prior art, the invention has the beneficial effects that: the low-voltage outgoing lead structure of the new energy high-capacity amorphous three-dimensional winding transformer provided by the invention effectively inhibits the skin effect and the proximity effect by adopting the multi-layer composite conductive bar structure, and solves the problems of high lead temperature, large space occupation, strong electromagnetic interference, difficult assembly and the like in the prior art. Furthermore, the fan-shaped layout and the radiating fin design are combined, so that the radiating efficiency is remarkably improved, the temperature rise of the lead is reduced, and the insulation aging problem caused by local overheating is avoided. Furthermore, through the design of three-ph