A winding mold and a casting mold for a 110kV power dry-type transformer

Abstract

The application provides a winding mold and a pouring mold of a 110kV power dry-type transformer, and the pouring mold comprises the winding mold, an outer mold, a bottom plate, a pouring material hole and a wire outlet panel; the winding mold comprises an upper positioning plate, a lower positioning plate and an inner mold on which wires are wound; the upper positioning plate and the lower positioning plate are hollow annular, the inner diameter of the upper positioning plate and the lower positioning plate matches the outer diameter of the inner mold, the upper positioning plate is sleeved on the upper end of the inner mold, and the lower positioning plate is sleeved on the lower end of the inner mold; the winding mold is placed on the bottom plate; the wire outlet panel is installed on one side of the upper positioning plate and the lower positioning plate in alignment; the outer mold is sleeved on the outer surface of the wires, and forms a sealed pouring cavity with the upper positioning plate, the lower positioning plate, the inner mold, the bottom plate and the wire outlet panel; and the pouring material hole is arranged on the upper positioning plate. In the application, the pouring mold is simple to process, convenient to assemble and disassemble, can be repeatedly used for many times and has low manufacturing cost.

Description

Technical Field

[0001] The present invention relates to the field of transformer technology, and in particular to a winding mold and a casting mold for a 110kV power dry-type transformer. Background Technology

[0002] In recent years, with the vigorous development of the national new energy and new infrastructure market, the demand for 66kV and 110kV dry-type transformers has gradually increased. Many domestic and international dry-type transformer manufacturers have conducted extensive research and development work on 66kV and 110kV transformers. 110kV dry-type transformers have outstanding advantages in terms of environmental performance and electrical safety. They can change the choice of power supply equipment in high-rise buildings in large cities, and also have wide applications in data centers and new energy fields, effectively replacing sulfur hexafluoride transformers.

[0003] However, existing power dry-type transformer casting molds are commonly used in products with voltage levels of 35kV and below, but have not been applied in products with voltage levels of 110kV. Summary of the Invention

[0004] This invention provides a winding mold and a casting mold for a 110kV power dry-type transformer, to solve the problem that existing power dry-type transformer casting molds have not been applied at the 110kV voltage level.

[0005] To solve the above-mentioned technical problems, the present invention is implemented as follows:

[0006] In a first aspect, embodiments of the present invention provide a winding die, comprising:

[0007] The system comprises an upper positioning plate, a lower positioning plate, an inner mold, two transmission discs, and multiple connecting support plates. The upper and lower positioning plates are hollow annular rings, with their inner diameters matching the outer diameter of the inner mold. The upper positioning plate is fitted onto the upper end of the inner mold, and the lower positioning plate is fitted onto the lower end of the inner mold. The outer diameters of the two transmission discs match the inner diameters of the upper and lower positioning plates, and the two transmission discs are respectively embedded within the upper and lower positioning plates. The two transmission discs are fixedly connected to the upper and lower positioning plates via the multiple connecting support plates.

[0008] The winding die is used to wind a wire, which is wound on the inner die.

[0009] Optionally, the upper positioning plate and the lower positioning plate further include: a plurality of air passage holes, the plurality of air passage holes being disposed on the annular plate body of the upper positioning plate and the lower positioning plate, wherein the air passage holes on the upper positioning plate correspond to at least one air passage hole on the lower positioning plate.

[0010] Optionally, the diameter of one of two adjacent airway holes in the plurality of airway holes is larger than the diameter of the other airway hole.

[0011] Secondly, embodiments of the present invention provide a casting mold for a 110kV dry-type power transformer, comprising:

[0012] The winding mold comprises an outer mold, a base plate, a casting hole, and a wire exit panel; the winding mold includes an upper positioning plate, a lower positioning plate, and an inner mold with the wire wound on it; the upper positioning plate and the lower positioning plate are hollow annular, the inner diameter of the upper positioning plate and the lower positioning plate are matched with the outer diameter of the inner mold, the upper positioning plate is fitted onto the upper end of the inner mold, and the lower positioning plate is fitted onto the lower end of the inner mold;

[0013] The winding mold is placed on the base plate; the lead-out panel is aligned and installed on one side of the upper positioning plate and the lower positioning plate; the outer mold is fitted onto the outer surface of the wire, forming a sealed casting cavity with the upper positioning plate, the lower positioning plate, the inner mold, the base plate and the lead-out panel; the casting hole is located on the upper positioning plate.

[0014] Optionally, the base plate is an integrally formed structure, the shape of the base plate corresponds to the lower positioning plate, and the area of ​​the base plate is larger than that of the lower positioning plate.

[0015] Optionally, a boss is provided between the outgoing terminals of the outgoing panel. The boss is used to increase the creepage distance between the outgoing terminals and the ground and the creepage distance between the outgoing terminals.

[0016] Optional, also includes:

[0017] The inner mold reinforcing rib is detachably mounted on the inner mold.

[0018] Optionally, the casting mold further includes a coarse-threaded screw and a pressure plate. The base plate is provided with a pressure plate mounting hole. The pressure plate is set at the upper end of the inner mold and the outer mold through the pressure plate mounting hole and the coarse-threaded screw, so as to press the inner mold and the outer mold.

[0019] Optional, also includes:

[0020] A measuring hole for the level of the pouring liquid is provided on the upper positioning plate.

[0021] Optional, also includes:

[0022] Multiple mechanical jacks are evenly placed below the base plate, and the multiple mechanical jacks support and balance the base plate and the casting mold of the 110kV power dry-type transformer.

[0023] In this invention, a special casting mold for 110kV power dry-type transformers is used to achieve one-time casting of high-voltage coils, avoiding material leakage during the casting process, which would affect the electrical performance, mechanical strength, temperature rise, and quality problems caused by coil appearance cracking, and thus meet the requirements for preventing creepage of high-voltage coils. Attached Figure Description

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0025] Figure 1 This is a schematic diagram of the structure of a winding mold provided in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the casting mold for a 110kV dry-type power transformer provided in an embodiment of the present invention. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please refer to Figure 1 This invention provides a winding mold 01, comprising:

[0029] The system comprises an upper positioning plate 1, a lower positioning plate 2, an inner mold 3, two transmission discs 4, and multiple connecting support plates 5. The upper positioning plate 1 and the lower positioning plate 2 are hollow annular rings, and their inner diameters match the outer diameter of the inner mold 3. The upper positioning plate 1 is fitted onto the upper end of the inner mold 3, and the lower positioning plate 2 is fitted onto the lower end of the inner mold 3. The outer diameters of the two transmission discs 4 match the inner diameters of the upper positioning plate 1 and the lower positioning plate 2. The two transmission discs 4 are respectively embedded in the upper positioning plate 1 and the lower positioning plate 2, and are fixedly connected to the upper positioning plate 1 and the lower positioning plate 2 through multiple connecting support plates 5.

[0030] The winding die is used to wind the wire, and the wire is wound on the inner die 3.

[0031] In this embodiment of the invention, the transmission disc is mechanically connected to the upper and lower positioning plates to prevent metal powder from contaminating the coil during the winding process due to rotation and friction between the inner mold and the coil. The winding mold 01 is simple to process, has strong processability, is easy to assemble and disassemble, has high production efficiency and high reliability, can be reused multiple times, and has low manufacturing cost.

[0032] In this embodiment of the invention, the inner mold 3 is a high-pressure inner mold. The high-pressure inner mold soft thin plate is rolled to the required size (e.g., ΦD = 1582mm) by a rolling machine. The inner mold joint can be sealed with a 10mm heat-resistant silicone plate, but is not limited to this. The inner mold 3 is formed by mechanical assembly of clamping plates to form a circular seal. The upper positioning plate 1 and the lower positioning plate 2 are respectively fitted on the upper end and the lower end of the inner mold 3. The upper positioning plate 1, the lower positioning plate 2 and the inner mold 3 are assembled together. The inner side of the inner mold is equipped with detachable reinforcing ribs.

[0033] In this embodiment of the invention, two transmission discs 4 are respectively embedded in the upper and lower ends of the inner mold 3. The two transmission discs 4 are mechanically connected to the upper positioning plate 1 and the lower positioning plate 2 to prevent metal powder from contaminating the coil due to rotation and friction with the inner mold during the winding process. The transmission discs 4 are mechanically connected to the upper positioning plate 1 and the lower positioning plate 2 through connecting support plates 5 to limit the generation of metal powder from friction between the upper positioning plate 1 and the lower positioning plate 2 and the inner mold 3, thus preventing potential quality issues. The number of connecting support plates 5 can be set to four according to actual needs. A square steel through hole is opened in the center of the transmission disc 4. The size of the square steel through hole can be, but is not limited to, 62mm×62mm. The transmission square steel is passed through the square steel through hole and mounted on the horizontal winding machine for wire winding.

[0034] In this embodiment of the invention, the inner side of the inner mold 3 is also provided with a detachable inner mold reinforcing rib. The inner mold reinforcing rib is an arc-shaped reinforcing rib, which is divided into three sections (upper, middle, and lower) along the inner diameter axis of the inner mold 3. The inner mold reinforcing rib is mechanically connected to the inner mold. By increasing the inner mold reinforcing rib, the overall strength of the inner diameter of the mold is enhanced, avoiding the deformation of the inner mold caused by the large pressure generated by the liquid surface pressure on the inner wall of the mold during use, which would result in large-scale material leakage. The reinforcing rib support plate of the inner mold reinforcing rib is welded using a spot welding process. The reinforcing rib is bolted to the support plate and is detachable, avoiding the problem of local welding deformation of the inner wall of the mold caused by full welding of the reinforcing rib support plate, and minimizing the deformation of the inner mold 3 caused by welding.

[0035] In this embodiment of the invention, optionally, a T-shaped screw is provided, and the two transmission discs 4 are provided with process holes. The T-shaped screw passes through the process holes to axially tighten the transmission discs.

[0036] In this embodiment of the invention, optionally, the upper positioning plate 1 and the lower positioning plate 2 further include: a plurality of air passage holes 6, the plurality of air passage holes 6 being disposed on the annular plate body of the upper positioning plate 1 and the lower positioning plate 2, wherein the air passage holes 6 on the upper positioning plate 1 correspond to at least one air passage hole 6 on the lower positioning plate 2; and the diameter of one of two adjacent air passage holes 6 is larger than the diameter of the other air passage hole.

[0037] In this embodiment of the invention, the air passage holes 6 on the upper positioning plate 1 and the lower positioning plate 2 adopt a large-small end process, that is, adjacent air passage holes 6 are arranged and processed with one large and one small end, and the air passage holes 6 in different layers inside and outside are also arranged and processed with large and small ends staggered. This avoids the coil taper problem caused by the uniformity of one end of the air passage, and it is of great help in the air passage positioning during the later coil winding process, avoiding the problem of air passage plate movement caused by unreliable air passage positioning during the coil winding process.

[0038] In this embodiment of the invention, the casting hole is disposed on the upper positioning plate 1.

[0039] In this embodiment of the invention, a liquid level measuring hole is provided on the upper positioning plate.

[0040] In this embodiment of the invention, during the casting of the casting mold, the resin material flows into the mold cavity from the casting hole. A self-leveling process is adopted, and a casting liquid level measuring hole is designed at the upper positioning plate to facilitate the measurement of the resin casting liquid level height, ensuring that the axial height deviation of the casting coil is within the allowable range.

[0041] Please refer to Figure 2 This invention provides a casting mold 02 for a 110kV dry-type power transformer, comprising:

[0042] The winding mold 01 includes an outer mold 7, a base plate 8, a casting hole 9, and a wire outlet panel 10. The winding mold 01 includes an upper positioning plate 1, a lower positioning plate 2, and an inner mold 3 with a wire wound on it. The upper positioning plate 1 and the lower positioning plate 2 are hollow annular shapes, and their inner diameters match the outer diameter of the inner mold 3. The upper positioning plate 1 is fitted onto the upper end of the inner mold 3, and the lower positioning plate 2 is fitted onto the lower end of the inner mold 3.

[0043] The winding mold 01 is placed on the base plate 8; the lead-out panel 10 is aligned and installed on one side of the upper positioning plate 1 and the lower positioning plate 2; the outer mold 7 is fitted onto the outer surface of the wire, forming a sealed casting cavity with the upper positioning plate 1, the lower positioning plate 2, the inner mold 3, the base plate 8 and the lead-out panel 10; the casting hole 9 is provided on the upper positioning plate 1.

[0044] In this embodiment of the invention, a special casting mold for 110kV power dry-type transformers is used to achieve one-time casting of high-voltage coils, avoiding material leakage during the casting process, which would affect the electrical performance, mechanical strength, temperature rise, and quality problems caused by coil appearance cracking, and thus meet the requirements for preventing creepage of high-voltage coils.

[0045] In this embodiment of the invention, the casting mold is a mold specifically used for epoxy resin casting of 110kV power dry-type transformers. The base plate 8 is an integrally formed structure without any welding rods or arc welding, such as base plate legs, hoisting and tie rod support plates. The press bolts are fastened to the base plate to prevent stress deformation caused by arc welding, which would affect the vertical flatness of the casting mold. The shape of the base plate 8 corresponds to the lower positioning plate 2 and is larger than the area of ​​the lower positioning plate 2. The base plate 8 can be, but is not limited to, a 25mm thick Q235B steel plate integrally formed into a 2200mm "peach-shaped" base plate. The base plate 8 includes four tie rod support plates cut along the circumference and a slot for the cable outlet panel. The winding mold 01 stands vertically on the base plate 8.

[0046] In this embodiment of the invention, optionally, a boss is provided between the outgoing terminals of the outgoing panel 10. The boss is used to increase the creepage distance between the outgoing terminals and ground and the creepage distance between the outgoing terminals.

[0047] In this embodiment of the invention, the tap area of ​​the output panel 10 is designed with umbrella skirts and bosses to extend the creepage distance of the high-voltage coil. Circular bosses and straight bosses are provided between the high-voltage coil output terminals to prevent creepage, thereby increasing the creepage distance between the terminals and the ground, as well as the creepage distance between the terminals.

[0048] In this embodiment of the invention, optionally, it also includes:

[0049] Inner mold reinforcing rib 11, which is detachably mounted on the inner mold.

[0050] In this embodiment of the invention, the inner side of the inner mold 3 is also provided with a detachable inner mold reinforcing rib 11. The inner mold reinforcing rib 11 is an arc-shaped reinforcing rib. The inner mold reinforcing rib 11 is divided into three sections (upper, middle, and lower) along the inner diameter axis of the inner mold 3. The inner mold reinforcing rib 11 is mechanically connected to the inner mold 3. By increasing the inner mold reinforcing rib 11, the overall strength of the inner diameter of the mold is enhanced, avoiding the deformation of the inner mold caused by the large pressure generated by the liquid surface pressure on the inner wall of the mold during use, which would result in large-scale material leakage. The reinforcing rib support plate of the inner mold reinforcing rib 11 is welded by spot welding. The reinforcing rib and the support plate are bolted and detachable, avoiding the problem of local welding deformation of the inner wall of the mold caused by full welding of the reinforcing rib support plate, and minimizing the deformation of the inner mold 3 caused by welding.

[0051] In this embodiment of the invention, optionally, the casting mold 02 further includes: a coarse-threaded screw 12 and a pressure plate 13. The base plate is provided with a pressure plate mounting hole. The pressure plate is set at the upper end of the inner mold and the outer mold through the pressure plate mounting hole and the coarse-threaded screw, so as to press the inner mold and the outer mold.

[0052] In this embodiment of the invention, the coarse-threaded screw 12 and the pressure plate 13 are pressed onto the inner mold 3 and the outer mold 7. The pressure plate 14 is made of six rectangular square tubes. The material of the pressure plate can be, but is not limited to, 80×80 rectangular steel tubes, distributed with equal acute angles of 60° to ensure the mechanical strength of the pressing, forming a "six-legged" pressure plate, which is vertically pressed onto the upper surfaces of the inner and outer molds. The mounting holes of the pressure plate 13 are limited by round steel to prevent the coarse-threaded screw 12 from rotating on its own during the screw tightening process, ensuring the vertical pressing strength. The coarse-threaded screw 12 has high tensile strength and hardness to prevent the risk of mold bursting. The coarse-threaded screw 12 can be, but is not limited to, a "T"-shaped coarse-threaded screw, which can improve the tensile strength of the screw and also enable quick assembly.

[0053] In this embodiment of the invention, optionally, it also includes:

[0054] The pouring liquid level measuring hole 14 is disposed on the upper positioning plate 1.

[0055] In this embodiment of the invention, during the casting of the casting mold, the resin material flows into the mold cavity from the casting hole 9. The self-leveling process is adopted. By designing the casting liquid level measuring hole 14 at the upper positioning plate, it is convenient to measure the height of the resin casting liquid level, ensuring that the axial height deviation of the casting coil is within the allowable range.

[0056] In this embodiment of the invention, optionally, it also includes:

[0057] Multiple mechanical jacks 15 are evenly placed under the base plate 8. The multiple mechanical jacks 15 support and balance the base plate 8 and the casting mold 02 of the 110kV power dry-type transformer.

[0058] In this embodiment of the invention, eight mechanical jacks 15 may be provided, but are not limited to, to support the base plate 8 and the casting mold 02 of the 110kV power dry-type transformer, and to ensure the flatness of the base plate 8. The mechanical jacks 15 can be set to a height requirement of ≤9mm according to the actual situation, and are used in conjunction with the base plate 8 which is cut and formed in one go, reducing the risk of deformation of the hot-welded steel plate caused by the welding legs of the base plate 8.

[0059] In this embodiment of the invention, the transmission disc is mechanically connected to the upper and lower positioning plates to prevent metal powder contamination of the coil caused by rotational movement and friction between the mold and the inner mold during the winding process. The assembly of the upper and lower positioning plates with the inner mold avoids the potential risk of partial discharge within the coil caused by gaps in the assembly of the upper and lower positioning plates with the inner mold, which could lead to asynchronous rotation between the positioning plates and the transmission disc during coil winding, resulting in metal powder generation. Removable reinforcing ribs are installed on the inner side of the inner mold to prevent material leakage during casting. The inner and outer molds are vertically mounted on the base plate, which is integrally machined in one piece, avoiding the risk of deformation caused by welding. A mechanical jack is used for support under the base plate to adjust the mold's horizontal flatness. Furthermore, the process is simple, highly manufacturable, easy to assemble and disassemble, with high production efficiency, high reliability, reusability, and low manufacturing cost.

[0060] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0061] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0062] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A casting mold for a 110kV dry-type power transformer, characterized in that, include: Winding mold, outer mold, base plate, casting hole and wire exit panel; The winding mold includes: an upper positioning plate, a lower positioning plate, and an inner mold with wire wound on it; the upper positioning plate and the lower positioning plate are hollow annular, and the inner diameter of the upper positioning plate and the lower positioning plate matches the outer diameter of the inner mold. The upper positioning plate is fitted onto the upper end of the inner mold, and the lower positioning plate is fitted onto the lower end of the inner mold. The inner mold is a high-pressure inner mold, which is formed by rolling a soft thin plate of the high-pressure inner mold to the required size using a rolling machine. The joints of the inner mold are sealed with heat-resistant silicone plates, and the inner mold is formed by mechanical assembly using clamping plates. The winding mold is placed on the base plate; the lead-out panel is aligned and installed on one side of the upper positioning plate and the lower positioning plate; the outer mold is fitted onto the outer surface of the conductor, forming a sealed casting cavity with the upper positioning plate, the lower positioning plate, the inner mold, the base plate and the lead-out panel; the casting hole is set on the upper positioning plate to realize the one-time casting of the high-voltage coil; The base plate is a one-piece molded structure without any welding rod arc welding. The base plate support legs, hoisting and pulling screw support plates are fastened to the base plate with press bolts. The shape of the base plate corresponds to the lower positioning plate and is larger than the area of ​​the lower positioning plate. The base plate is made of steel plate in one piece. The winding mold stands vertically on the base plate.

2. The casting mold for a 110kV dry-type power transformer according to claim 1, characterized in that, The outgoing terminals of the outgoing panel are provided with protrusions, which are used to increase the creepage distance between the outgoing terminals and the ground and the creepage distance between the outgoing terminals.

3. The casting mold for a 110kV dry-type power transformer according to claim 1, characterized in that, Also includes: The inner mold reinforcing rib is detachably mounted on the inner mold.

4. The casting mold for a 110kV dry-type power transformer according to claim 1, characterized in that, The casting mold further includes a coarse-threaded screw and a pressure plate. The base plate is provided with a pressure plate mounting hole. The pressure plate is set at the upper end of the inner mold and the outer mold through the pressure plate mounting hole and the coarse-threaded screw, so as to press the inner mold and the outer mold together.

5. The casting mold for a 110kV dry-type power transformer according to claim 1, characterized in that, Also includes: A measuring hole for the level of the pouring liquid is provided on the upper positioning plate.

6. The casting mold for a 110kV dry-type power transformer according to claim 1, characterized in that, Also includes: Multiple mechanical jacks are evenly placed below the base plate, and the multiple mechanical jacks support and balance the base plate and the casting mold of the 110kV power dry-type transformer.

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