APG-based 12kV fully insulated voltage transformer and its manufacturing method

Abstract

The present application provides a 12kV fully insulated voltage transformer based on APG and a method for manufacturing the same, characterized in that the 12kV fully insulated voltage transformer comprises: a base; a core low-voltage shielding mesh provided on one side of the base; a coil high-voltage shielding mesh provided on the side of the core low-voltage shielding mesh away from the base; a fusion tube shielding mesh provided on the outer side of the coil high-voltage shielding mesh away from the core low-voltage shielding mesh; and a casing shielding mesh provided on the outer side of the fusion tube shielding mesh. The core low-voltage shielding mesh has a circular mesh structure. The core low-voltage shielding mesh is made of semi-conductive nylon. The coil high-voltage shielding mesh has a ring structure. The coil high-voltage shielding mesh includes a shielding mesh and a coil. The fusion tube shielding mesh has a cylindrical structure. The casing shielding mesh has a ring structure. The casing shielding mesh is provided with a zinc layer and a mesh ring. Thus, the 12kV fully insulated voltage transformer produced using the APG production process has a short production cycle, high efficiency, and is very suitable for mass production.

Description

Technical Field

[0001] The present application relates to the technical field of power equipment, and in particular to an APG-based 12kV fully insulated voltage transformer and a preparation method thereof. Background Art

[0002] A solid-state switchgear (SINS) is a ring main unit (RMU) that uses solid insulation material as its primary insulating medium. The main conductive circuits, including the vacuum interrupter and its conductive connections, disconnectors, earthing switches, main busbars, and branch busbars, are encapsulated with a solid insulating medium, either singly or in combination, to form one or more fully insulated and sealed modules with specific functions that can be reassembled or expanded. The accessible surfaces of these modules are coated with a conductive or semi-conductive shielding layer and can be directly and reliably grounded.

[0003] Solid insulation has its inherent technical advantages and has recently experienced rapid development. While 12kV solid insulation technology is highly mature, 12kV fully insulated voltage transformers based on this technology have not made significant progress. This is primarily due to the low yield rate and long production cycles associated with traditional manufacturing methods for 12kV fully insulated voltage transformers, ultimately leading to high production costs. The APG production process, on the other hand, offers a short production cycle and high efficiency, making it well-suited for mass production.

[0004] Therefore, the present application invents a 12kV fully insulated voltage transformer based on APG and a preparation method thereof. Summary of the Invention

[0005] The present application provides an APG-based 12kV fully insulated voltage transformer and a preparation method thereof, which can be used to solve the technical problems that the traditional preparation method of the existing 2kV fully insulated voltage transformer has a low pass rate, a long production cycle, and ultimately leads to a high production cost of the 12kV fully insulated voltage transformer.

[0006] In a first aspect, the present application provides a 12kV fully insulated voltage transformer based on APG, the 12kV fully insulated voltage transformer comprising:

[0007] base;

[0008] An iron core low-voltage shielding net is provided on one side of the base;

[0009] A coil high-voltage shielding net is sleeved on one side of the iron core low-voltage shielding net away from the base;

[0010] A fused tube shielding net is provided on the outer side of the coil high-voltage shielding net away from the iron core low-voltage shielding net;

[0011] The outer side of the fusion pipe shielding net is provided with a sleeve shielding net;

[0012] A surface grounding zinc layer is provided on the base, and the surface grounding zinc layer wraps the iron core low-voltage shielding mesh, the coil high-voltage shielding mesh, the melting tube shielding mesh and the casing shielding mesh;

[0013] APG-injected epoxy resin material is provided on one side of the surface grounded zinc layer, close to the melting pipe shielding mesh.

[0014] In an implementation manner of the first aspect, the iron core low-voltage shielding net is a loop-shaped mesh structure.

[0015] In an implementation manner of the first aspect, the iron core low-voltage shielding mesh is made of semi-conductive nylon.

[0016] In an implementation manner of the first aspect, the coil high-voltage shielding net is a ring-shaped structure.

[0017] In an implementation manner of the first aspect, the coil high-voltage shielding net includes a shielding net and a coil, wherein the shielding net is 2 mm higher than the coil, and R angles at both ends of the shielding net are 1.5 mm.

[0018] In an implementation manner of the first aspect, the fusion pipe shielding mesh is a cylindrical structure.

[0019] In an implementation manner of the first aspect, the length of the fusion pipe shielding mesh is 200 mm and the diameter is 45 mm.

[0020] In an implementation manner of the first aspect, the sleeve shielding net is a ring-shaped structure.

[0021] In an implementation manner of the first aspect, the sleeve shielding net is provided with a zinc layer and a mesh ring, wherein the distance from the end of the zinc layer to the curling center of the mesh ring is 12 mm, and the inner measurement distance of the mesh ring is 10 mm.

[0022] In a second aspect, the present application provides a method for preparing a 12kV fully insulated voltage transformer based on APG, which is applied to preparing the 12kV fully insulated voltage transformer based on APG in the first aspect and various possible implementations, and the preparation method comprises:

[0023] Preheat the 12kV fully insulated voltage transformer mold, and set the preheating temperature to 135℃~145℃;

[0024] Pour the epoxy resin material into the vacuum tank and perform vacuuming;

[0025] Injecting the vacuumed epoxy resin material in the vacuum tank into the preheated 12kV fully insulated voltage transformer mold according to a preset injection pressure and taking out the semi-finished product after a preset solidification time;

[0026] The semi-finished product is placed in an oven and baked at a preset temperature and for a preset time to obtain a final product;

[0027] A zinc layer is sprayed on the surface of the finalized product to obtain the 12kV fully insulated voltage transformer.

[0028] As can be seen from the above technical solution, the present application provides a 12kV fully insulated voltage transformer based on APG, characterized in that the 12kV fully insulated voltage transformer comprises: a base; a core low-voltage shielding mesh provided on one side of the base; a coil high-voltage shielding mesh sleeved on the side of the core low-voltage shielding mesh away from the base; a fused tube shielding mesh provided on the outer side of the coil high-voltage shielding mesh away from the core low-voltage shielding mesh; and a sleeve shielding mesh sleeved on the outer side of the fused tube shielding mesh. The core low-voltage shielding mesh has a loop-shaped mesh structure. The core low-voltage shielding mesh is made of semi-conductive nylon. The coil high-voltage shielding mesh has a ring-shaped structure. The coil high-voltage shielding mesh includes a shielding mesh and a coil, wherein the shielding mesh protrudes 2mm above the coil, and the rounded corners at both ends of the shielding mesh are 1.5mm. The fused tube shielding mesh has a cylindrical structure. The fused tube shielding mesh has a length of 200mm and a diameter of 45mm. The sleeve shielding mesh has a ring-shaped structure. The bushing shielding mesh is provided with a zinc layer and a mesh ring. The distance from the end of the zinc layer to the center of the mesh ring's curling edge is 12 mm, and the inner distance of the mesh ring is 10 mm. Thus, the 12kV fully insulated voltage transformer produced using the APG production process has a short production cycle and high efficiency, making it very suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] Figure 1 Schematic diagram of the internal structure of the APG-based 12kV fully insulated voltage transformer provided in this application;

[0031] Figure 2 Schematic diagram of the external structure of the APG-based 12kV fully insulated voltage transformer provided in this application;

[0032] Figure 3 A schematic diagram of the structure of the iron core low-voltage shielding network of the 12kV fully insulated voltage transformer based on APG provided in this application;

[0033] Figure 4 A schematic diagram of the structure of the coil high-voltage shielding net of the 12kV fully insulated voltage transformer based on APG provided in this application;

[0034] Figure 5 Schematic diagram of the dimensions of the coil high-voltage shielding net of the 12kV fully insulated voltage transformer based on APG provided in this application;

[0035] Figure 6 A schematic diagram of the structure of the fused tube shielding net of the 12kV fully insulated voltage transformer based on APG provided in this application;

[0036] Figure 7 Schematic diagram of the dimensions of the bushing shielding net of the APG-based 12kV fully insulated voltage transformer provided in this application.

[0037] Figures 1 to 7 middle:

[0038] 100 is the base, 200 is the low-voltage shielding mesh of the iron core, 300 is the high-voltage shielding mesh of the coil, 310 is the shielding mesh, 320 is the coil, 400 is the melting tube shielding mesh, 500 is the casing shielding mesh, 510 is the zinc layer, 520 is the mesh ring, 600 is the surface grounding zinc layer, and 700 is the APG injected epoxy resin material. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0040] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to be limiting of the present application. As used in the specification and appended claims of this application, the singular expressions "a", "an", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context. It should also be understood that in the following embodiments of the present application, "at least one", "one or more" refer to one, two or more, and "a plurality" refers to two or more. The term "and / or" is used to describe the association relationship of associated objects, indicating that three relationships can exist; for example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the related objects before and after are in an "or" relationship.

[0041] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0042] The first embodiment of the present application discloses a 12kV fully insulated voltage transformer based on APG. The 12kV fully insulated voltage transformer based on APG disclosed in the first embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0043] See also Figure 1 , is a schematic diagram of the internal structure of the APG-based 12kV fully insulated voltage transformer provided in this application;

[0044] Depend on Figure 1 It can be seen that the APG-based 12kV fully insulated voltage transformer provided in the first embodiment of the present application includes:

[0045] Base 100;

[0046] An iron core low voltage shielding net 200 is provided on one side of the base 100;

[0047] See also Figure 3 , Figure 3 A schematic diagram of the structure of the iron core low-voltage shielding network of the 12kV fully insulated voltage transformer based on APG provided in this application;

[0048] Depend on Figure 3 It can be seen that in some embodiments of the present application, the iron core low-voltage shielding net 200 is a loop-shaped mesh structure.

[0049] In some embodiments of the present application, the iron core low-voltage shielding mesh 200 is made of semi-conductive nylon.

[0050] The side of the core low-voltage shielding net 200 away from the base 100 is covered with a coil high-voltage shielding net 300;

[0051] See also Figure 4 , Figure 4 A schematic diagram of the structure of the coil high-voltage shielding net of the 12kV fully insulated voltage transformer based on APG provided in this application;

[0052] Depend on Figure 4It can be seen that in some embodiments of the present application, the coil high-voltage shielding net 300 is a ring-shaped structure.

[0053] See also Figure 5 , Figure 5 Schematic diagram of the dimensions of the coil high-voltage shielding net of the 12kV fully insulated voltage transformer based on APG provided in this application;

[0054] Depend on Figure 5 It can be seen that in some embodiments of the present application, the coil high-voltage shielding net 300 includes a shielding net 310 and a coil 320, wherein the shielding net 310 is 2 mm higher than the coil 320, and the R angles at both ends of the shielding net 310 are 1.5 mm.

[0055] A fused tube shielding net 400 is provided on the outer side of the coil high voltage shielding net 300 away from the core low voltage shielding net 200;

[0056] See also Figure 6 , Figure 6 A schematic diagram of the structure of the fused tube shielding net of the 12kV fully insulated voltage transformer based on APG provided in this application;

[0057] Depend on Figure 6 It can be seen that in some embodiments of the present application, the melting pipe shielding net 400 is a cylindrical structure.

[0058] See also Figure 7 , Figure 7 Schematic diagram of the dimensions of the bushing shielding net of the APG-based 12kV fully insulated voltage transformer provided in this application.

[0059] Depend on Figure 7 It can be seen that in some embodiments of the present application, the length of the melting pipe shielding mesh 400 is 200 mm and the diameter is 45 mm.

[0060] The outer side of the fusion pipe shielding net 400 is provided with a sleeve shielding net 500;

[0061] In some embodiments of the present application, the sleeve shielding net 500 is a ring-shaped structure.

[0062] In some embodiments of the present application, the sleeve shielding net 500 is provided with a zinc layer 510 and a mesh ring 520, wherein the distance from the end of the zinc layer 510 to the curling center of the mesh ring 520 is 12 mm, and the inner measurement distance of the mesh ring 520 is 10 mm.

[0063] Figure 2 Schematic diagram of the external structure of the APG-based 12kV fully insulated voltage transformer provided in this application;

[0064] The base 100 is provided with a surface grounding zinc layer 600, and the surface grounding zinc layer 600 wraps the core low-voltage shielding mesh 200, the coil high-voltage shielding mesh 300, the melting tube shielding mesh 400 and the casing shielding mesh 500;

[0065] APG-injected epoxy resin material 700 is provided on one side of the surface grounded zinc layer 600 , close to the melting pipe shielding mesh 400 .

[0066] As can be seen from the above technical solution, the present application provides a 12kV fully insulated voltage transformer based on APG, characterized in that the 12kV fully insulated voltage transformer comprises: a base; a core low-voltage shielding mesh provided on one side of the base; a coil high-voltage shielding mesh sleeved on the side of the core low-voltage shielding mesh away from the base; a fused tube shielding mesh provided on the outer side of the coil high-voltage shielding mesh away from the core low-voltage shielding mesh; and a sleeve shielding mesh sleeved on the outer side of the fused tube shielding mesh. The core low-voltage shielding mesh has a loop-shaped mesh structure. The core low-voltage shielding mesh is made of semi-conductive nylon. The coil high-voltage shielding mesh has a ring-shaped structure. The coil high-voltage shielding mesh includes a shielding mesh and a coil, wherein the shielding mesh protrudes 2mm above the coil, and the rounded corners at both ends of the shielding mesh are 1.5mm. The fused tube shielding mesh has a cylindrical structure. The fused tube shielding mesh has a length of 200mm and a diameter of 45mm. The sleeve shielding mesh has a ring-shaped structure. The bushing shielding mesh is provided with a zinc layer and a mesh ring. The distance from the end of the zinc layer to the center of the mesh ring's curling edge is 12 mm, and the inner distance of the mesh ring is 10 mm. Thus, the 12kV fully insulated voltage transformer produced using the APG production process has a short production cycle and high efficiency, making it very suitable for mass production.

[0067] Corresponding to the APG-based 12kV fully insulated voltage transformer provided in the first embodiment of the present application, the second embodiment of the present application provides a method for preparing the APG-based 12kV fully insulated voltage transformer, the preparation method comprising:

[0068] Step 101, preheating a 12kV fully insulated voltage transformer mold, with the preheating temperature set to 135° C. to 145° C.;

[0069] Step 102: pour the epoxy resin material into a vacuum tank and evacuate the tank;

[0070] Step 103: injecting the vacuumized epoxy resin material in the vacuum tank into the preheated 12 kV fully insulated voltage transformer mold according to a preset injection pressure and taking out the semi-finished product after a preset solidification time;

[0071] Step 104: placing the semi-finished product into an oven and baking it at a preset temperature and for a preset time to obtain a final product;

[0072] Step 105: spraying a zinc layer on the surface of the finalized product to obtain the 12kV fully insulated voltage transformer.

[0073] The following first introduces the APG process:

[0074] The APG process involves placing epoxy resin and other materials in a vacuum tank, stirring them while vacuuming to remove air bubbles. The mixed materials are then poured into a heated mold and allowed to sit for 40 minutes before the product emerges. The vacuum casting process involves pouring epoxy casting material into a mold, heating it, and allowing it to sit for 24 hours. During this time, the mold maintains a negative pressure, which helps remove any internal pores.

[0075] The preparation method of the present application is described below with reference to specific embodiments:

[0076] Step 1: First, the voltage transformer is designed according to the claims of the present invention;

[0077] Step 2: The mold for manufacturing the voltage transformer has been preheated to a temperature of 140°C ± 5°C.

[0078] Step 3: Pour the epoxy resin material for APG into a vacuum tank and evacuate the tank while stirring for 2 hours at a stirring speed of 50 rpm.

[0079] Step 4: Pull the vacuum tank over to the APG production machine and inject the epoxy resin into the heated mold. Mold temperature: 140°C ± 5°C, maintain injection pressure at 0.45MPa, and remove the product after 45 minutes.

[0080] Step 5: Place the product in a 120°C oven for 24 hours to allow the product to completely cure and set.

[0081] Step 6: Spray the conductive zinc layer on the surface of the product. Figure 2 Requirements must be consistent.

[0082] The zinc spraying process of the product is:

[0083] Step 601: The product is protected in non-zinc spraying areas according to the drawing requirements and sprayed with 20-mesh steel grit;

[0084] Step 602: preheat the product to 70°C for 1 hour;

[0085] Step 603: Spray a zinc layer on the product to a thickness of 10 microns to 15 microns. The surface zinc layer is required to be continuous and uniform.

[0086] As can be seen from the above technical solution, compared to the existing technology for producing fully insulated voltage transformers using a casting process, one can be produced in 24 hours. The casting process is under negative pressure, preventing internal porosity defects in the product. The APG production process of the present invention can produce one unit in approximately 40 minutes, significantly reducing production time. However, the APG process also places higher demands on product design and temperature control during the process.

[0087] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein; the specification and examples are to be regarded as exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0088] It will be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof; the scope of the present invention being limited only by the appended claims.

Claims

1. APG-based 12kV fully insulated voltage transformer, characterized by: The 12kV fully insulated voltage transformer includes: Base (100); An iron core low-voltage shielding net (200) is provided on one side of the base (100); A coil high-voltage shielding net (300) is sleeved on a side of the iron core low-voltage shielding net (200) away from the base (100); A fusion tube shielding net (400) is provided on the outer side of the coil high-voltage shielding net (300) away from the iron core low-voltage shielding net (200); The outer side of the fusion pipe shielding net (400) is provided with a sleeve shielding net (500); A surface grounding zinc layer (600) is provided on the base (100), and the surface grounding zinc layer (600) wraps the iron core low-voltage shielding net (200), the coil high-voltage shielding net (300), the melting tube shielding net (400), and the casing shielding net (500); APG-injected epoxy resin material (700) is provided on one side of the surface grounded zinc layer (600) near the melting pipe shielding mesh (400); The coil high-voltage shielding net (300) is a ring-shaped structure; The coil high-voltage shielding net (300) comprises a shielding net (310) and a coil (320), wherein the shielding net (310) is 2 mm higher than the coil (320), and the R angles at both ends of the shielding net (310) are 1.5 mm; The sleeve shielding net (500) is a ring-shaped structure; The sleeve shielding net (500) is provided with a zinc layer (510) and a mesh ring (520), wherein the distance from the end of the zinc layer (510) to the curling center of the mesh ring (520) is 12 mm, and the inner measurement distance of the mesh ring (520) is 10 mm.

2. The 12kV fully insulated voltage transformer based on APG according to claim 1, characterized in that: The iron core low-voltage shielding net (200) is a loop-shaped mesh structure.

3. The 12kV fully insulated voltage transformer based on APG according to claim 2, characterized in that: The iron core low-voltage shielding net (200) is made of semi-conductive nylon.

4. The 12kV fully insulated voltage transformer based on APG according to claim 1, characterized in that: The fusion pipe shielding net (400) is a cylindrical structure.

5. The 12kV fully insulated voltage transformer based on APG according to claim 4, characterized in that: The length of the fusion pipe shielding net (400) is 200 mm and the diameter is 45 mm.

6. A method for preparing a 12kV fully insulated voltage transformer based on APG, characterized in that: For preparing the APG-based 12kV fully insulated voltage transformer according to any one of claims 1 to 5, the preparation method comprises: Preheat the 12kV fully insulated voltage transformer mold, and set the preheating temperature to 135℃~145℃; Pour the epoxy resin material into the vacuum tank and perform vacuuming; Injecting the vacuumed epoxy resin material in the vacuum tank into the preheated 12kV fully insulated voltage transformer mold according to a preset injection pressure and taking out the semi-finished product after a preset solidification time; The semi-finished product is placed in an oven and baked at a preset temperature and a preset baking time to obtain a final product; a zinc layer is sprayed on the surface of the final product to obtain the 12kV fully insulated voltage transformer.

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