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CN-122025353-A - High-voltage combined transformer

CN122025353ACN 122025353 ACN122025353 ACN 122025353ACN-122025353-A

Abstract

The application discloses a high-voltage combined transformer which comprises a shell, an insulating assembly, a base and a combined transformer, wherein the insulating assembly is arranged on the base, the shell is arranged at the top of the insulating assembly, and the combined transformer is arranged in the shell and is connected with a secondary junction box of the base through the insulating assembly. The application has the advantages of 1, increasing the integral strength of equipment, 2, facilitating the installation of windings, 3, realizing the insulation requirement that gas is not liquefied in a low-temperature environment of-60 ℃, enabling the product to be used in alpine regions, 4, adding shielding measures between a high-voltage coil and a current transformer body so as to effectively inhibit interference, 5, adopting a structure with high-low potential exchange for the voltage transformer so as to improve the insulation performance, 6, adopting an electromagnetic single-stage insulation structure, and solving the problem that the cascade structure needs to balance windings.

Inventors

  • ZHANG SHUHUA
  • CHEN DONGSHENG

Assignees

  • 广东四会互感器厂有限公司

Dates

Publication Date
20260512
Application Date
20260320

Claims (9)

  1. 1. The high-voltage combined transformer is characterized by comprising a shell (1), an insulating assembly, a base (2) and a combined transformer (3), wherein the insulating assembly is arranged on the base (2), the shell (1) is arranged at the top of the insulating assembly, and the combined transformer (3) is arranged in the shell (1) and is connected with a secondary junction box (21) of the base (2) through the insulating assembly.
  2. 2. The high voltage combined transformer according to claim 1, characterized in that the combined transformer (3) comprises a voltage transformer and a current transformer.
  3. 3. The high voltage combined transformer according to claim 1, characterized in that the combined transformer (3) has two C-shaped cores (31).
  4. 4. The high-voltage combined transformer according to claim 1, wherein a lead tube (4) is arranged in the housing (1), one end of the lead tube (4) is positioned in the housing (1), and the other end penetrates through the insulating assembly and extends into the base (2).
  5. 5. The high voltage combined transformer of claim 4, wherein the insulation assembly is a hollow structure, and the insulation assembly is filled with an insulation medium.
  6. 6. The high voltage combined transformer of claim 5, wherein the insulating medium is And (3) gas.
  7. 7. The high voltage combined transformer according to claim 5, characterized in that the insulation assembly comprises an insulation bushing (5), the top of the insulation bushing (5) being connected with the bottom of the housing (1).
  8. 8. The high voltage combined transformer according to claim 7, characterized in that the insulating sleeve (5) is made of a silicone rubber composite material.
  9. 9. The high voltage combined transformer according to claim 7, characterized in that a shielding ring is provided in the insulating sleeve (5).

Description

High-voltage combined transformer Technical Field The invention relates to the technical field of transformers, in particular to a high-voltage combined transformer. Background At present, transformers running in a high-voltage power grid mainly comprise two types of products, namely a voltage transformer and a current transformer, which are independently operated, and each group of three-phase circuits needs 3 voltage transformers and 3 current transformers, so that the occupied area is large and the cost is high. If the voltage transformer and the current transformer can be combined into one, the functions of 2 products can be realized on one product, the occupied area can be saved, and the cost is greatly reduced. The present application aims to integrate a voltage transformer and a current transformer into a combined transformer. For this reason, the applicant organizes technicians to review a great deal of domestic and foreign literature, demonstrate and establish research targets. From the literature, the project has little research and little result at home and abroad, and a plurality of key technologies still have not been solved. The main problems are: 1. the insulation support of the current transformer body needs to be compatible between the size and the strength. 2. The high-voltage winding adopts a reverse structure, the number of turns of the winding wire of each layer is increased, and the winding difficulty of the coil is increased. 3. The product is suitable for the running environment at the low temperature of-60 ℃ so as to be suitable for being used in the high-cold outdoor area. 4. And the high-voltage coil of the voltage transformer and the current transformer body are mutually interfered. Disclosure of Invention In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description. The summary of the invention is not intended to define the key features and essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. In order to at least partially solve the problems, the invention provides a high-voltage combined transformer which comprises a shell, an insulating assembly, a base and a combined transformer, wherein the insulating assembly is arranged on the base, the shell is arranged on the top of the insulating assembly, and the combined transformer is arranged in the shell and is connected with a secondary junction box of the base through the insulating assembly. Preferably, the combined transformer includes a voltage transformer and a current transformer. Preferably, the iron cores of the combined transformer are two C-shaped iron cores. Preferably, a lead tube is disposed in the housing, one end of the lead tube is disposed in the housing, and the other end of the lead tube penetrates the insulating assembly and extends into the base. Preferably, the insulating component is of a hollow structure, and the insulating component is filled with an insulating medium. Preferably, the insulating medium isAnd (3) gas. Preferably, the insulation assembly comprises an insulation sleeve, the top of which is connected with the bottom of the housing. Preferably, the insulating sleeve is made of a silicone rubber composite material. Preferably, a shielding ring is arranged in the insulating sleeve. Compared with the prior art, the invention at least comprises the following beneficial effects: 1. The insulation support design of the combined transformer (current transformer) is simulated by adopting a finite element simulation analysis method, the design reaches the expected size and strength through simulation, and the insulation support is designed in a single-side slightly convex shape, so that the size and strength can be ensured. Meanwhile, an upper insulating sleeve and a lower insulating sleeve are adopted, and a glass fiber reinforced plastic cylinder is arranged between the two insulating sleeves, so that the integral strength of the equipment is improved. 2. According to the characteristics of the reverse structure of the high-voltage coil: (1) The structure design of the C-shaped iron cores is adopted, the winding is convenient to install, and the two C-shaped iron cores are hooped after the winding is installed. (2) The existing winding machine is modified, so that the winding machine can wind double enamelled wires in parallel, and coils are wound more tightly through an automatic tension regulator. (3) The winding machine can flexibly adjust the width of the winding wire. (4) The high-voltage coil oven is modified, and a temperature sensor for controlling the oven is added, so that the temperature of the oven is accurately and effectively controlled. (5) The high-voltage coil adopts a sectional curing process, and reduces the heated volume, thereby reducing the condition of uneven heating of the coil and completely curing the f