Automatic pressure gel injection process and mold for voltage transformer

Abstract

The present invention relates to the field of automatic pressure gel technology, and in particular to an automatic pressure gel injection process and mold for a voltage transformer. The process includes step S1: using a static mixing device to prepare an epoxy resin mixture; step S2: installing a mold on the coil of the voltage transformer body, heating the mold to a set temperature and maintaining a constant temperature; step S3: first evacuating the mold, then filling it with SF6 gas, and then depressurizing it to normal pressure, so that the mold is in an SF6 gas insulation environment; step S4: automatically injecting the epoxy resin mixture into the mold through an automatic pressure gel device, the injection pressure is 0.10-0.15MPa, the initial injection speed is controlled at 1-2kg per minute, and when the injection weight exceeds 6kg, the total filling time is controlled at 10-12min; step S5: controlling the curing of the epoxy resin mixture gel through a mold constant temperature automatic control system; step S6: demoulding and taking out the injection body, and continuing the post-curing. The present invention is simple in scheme, easy to operate, short in gel curing time, shortens the production cycle, has high mechanical and electrical strength, and small in partial discharge.

Description

Technical Field

[0001] The invention relates to the technical field of automatic pressure gel, and in particular to an automatic pressure gel injection process and a mold for a voltage transformer. Background Art

[0002] At present, the production process of voltage transformer molds is suitable for epoxy resin vacuum casting. Automatic pressure gel equipment generally only produces current transformers and voltage transformers of 10kV and below. The mold is reasonably divided into multiple small parts for design, and then the coil body is installed in the mold. There is no need for direct injection under vacuum or simple evacuation and inflation injection. Because of the higher quality requirements of partial discharge test points for voltage transformers of 35kV and above, the existing injection mold design is limited by evacuation and inflation heating. There are too many small parts in the existing mold production structure, and the production cycle is too long. In the actual production process, the temperature stability of the mold has not been effectively controlled, and the product performance quality and appearance quality cannot be guaranteed.

[0003] The automatic pressure gel process of epoxy resin is an important process for producing electrical products. It is a new type of low-cost, high-performance molding technology for composite materials. It is a molding method that uses the flow and penetration of resin to achieve a close combination of devices and metal products under certain pressure conditions, and gels and solidifies under certain pressure. This process is suitable for products with high quality requirements, large batches, and unlimited size or shape. The automatic pressure gel process is in the field of electrical product manufacturing, and has been widely used in insulating parts, insulators, and current transformers and voltage transformers of 10kV and below. In addition, the automatic pressure gel process has always been the mainstream production process for transformer manufacturers' insulating parts and current transformers and voltage transformers of 10kV and below, which can not only shorten the production cycle but also ensure the stability of product quality. However, for voltage transformers of 35kV and above, the epoxy resin system of the automatic pressure gel process in the prior art has high viscosity, different gel time, unstable glass transition temperature, poor cracking resistance, low mechanical and electrical strength, large partial discharge, high cost, and is not suitable for installation and operation in special fields such as harsh environment, large temperature difference, and high altitude areas. Therefore, there is an urgent need for a safe, reliable and efficient automatic pressure gel injection process and mold for voltage transformer. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a voltage transformer automatic pressure gel injection process and mold to solve the problems of long production cycle of existing mold making, poor mold temperature stability, and uncontrollable product performance quality and appearance quality in the actual production process, as well as the problems of different gel time, unstable glass transition temperature, poor crack resistance, low mechanical and electrical strength, large local discharge and high cost in the existing epoxy resin automatic pressure gel process.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] On the one hand, the present invention provides a voltage transformer automatic pressure gel injection process, comprising the following steps:

[0007] Step S1: preparing epoxy resin mixture using static mixing equipment;

[0008] Step S2: The voltage transformer body coil is molded, and the mold is heated to a set temperature and maintained at a constant temperature;

[0009] Step S3: the injection cavity of the mold is first evacuated, then filled with SF6 gas, and then depressurized to normal pressure, so that the injection cavity of the mold is in an SF6 gas insulation environment;

[0010] Step S4: Automatically injecting the epoxy resin mixture into the mold through an automatic pressure gel device;

[0011] The injection pressure of the epoxy resin mixture is 0.10-0.15MPa. The injection speed is controlled at 1-2kg per minute at the beginning. When the injection weight exceeds 6kg, the total filling time is controlled at 10-12min.

[0012] Step S5: Controlling the curing of the epoxy resin mixture gel by a mold constant temperature automatic control system;

[0013] After the injection cavity of the mold is filled, maintain the pressure at 0.35-0.4MPa for 60±1min, and remove the mold after solidification;

[0014] Step S6: demoulding and taking out the injection molding body, and continuing the post-curing;

[0015] The post-curing oven is kept at a constant temperature of 135±5℃ for at least 12h, then cooled to 50℃ at a uniform rate over 6h before being taken out.

[0016] In one possible implementation, in step S3, the mold is evacuated to an ultimate vacuum below -0.1 MPa and maintained for 2 minutes; SF6 gas is filled to 0.05-0.1 MPa, maintained for 2 minutes, and then the pressure is released to normal pressure 0 MPa to start injection.

[0017] In a possible implementation, in step S1, an automatic control system of a static mixer is used to prepare an epoxy resin mixture, and the temperature of the mixture in the static mixer is 70-75°C.

[0018] In one possible implementation, in step S2, the pre-baking temperature of the left and right walls of the mold is 120-130°C; the pre-baking temperature of the top and rear of the mold is 115-120°C, and the pre-baking temperature of the bottom of the mold and the movable mold is 110-115°C.

[0019] On the other hand, the present invention provides a mold for realizing the automatic pressure gel injection process of the voltage transformer in the above-mentioned embodiment, which is arranged on the automatic pressure gel equipment, and the mold includes a static mold assembly and a dynamic mold, wherein the static mold assembly is arranged on the static mold plate of the automatic pressure gel equipment, and the dynamic mold is arranged on the dynamic mold plate of the automatic pressure gel equipment. The static mold assembly is provided with an inflation valve, an air release valve, an injection port valve and a thermocouple, and the voltage transformer body coil is hoisted in the static mold assembly; when the dynamic mold plate of the automatic pressure gel equipment drives the dynamic mold and the static mold assembly to close the mold, a closed injection cavity is formed; after the mold reaches the set temperature through the thermocouple, vacuuming, inflation, pressure relief and injection processes are carried out, and the injection process is completed in an insulating gas environment.

[0020] In one possible implementation, the static mold assembly includes a static mold, an upper mold, a lower mold, a left mold and a right mold, wherein the static mold is connected to the static mold plate of the automatic pressure gel equipment, and the upper mold, the lower mold, the left mold and the right mold are combined into a square frame structure and sealed connected to the static mold, the thermocouple is arranged on the upper mold, the lower mold, the left mold and the right mold, and the voltage transformer body coil is installed on the upper mold.

[0021] In one possible implementation, the outer surfaces of the upper mold, lower mold, left mold and right mold are provided with grooves for installing the thermocouples, and the thermocouples are pressed and fixed by thermocouple pressing plates; multiple thermocouples are connected to the mold constant temperature automatic control system.

[0022] In one possible implementation, an inflation port and an deflation port are provided on the upper mold, the inflation valve and the deflation valve are respectively provided on the inflation port and the deflation port, and an upper mold sub-plate for mounting the voltage transformer body coil is provided on the inner side of the upper mold; an injection port is provided at the lower part of the left mold or the right mold, and the injection port valve is provided on the injection port.

[0023] In one possible implementation, the inner surfaces of the static mold assembly and the dynamic mold are electroplated with chrome.

[0024] In a possible implementation, after the movable mold and the static mold assembly are molded together, the movable mold and the static mold assembly are connected via a demoulding pull plate.

[0025] The advantages and beneficial effects of the present invention are: the present invention provides an automatic pressure gel injection process for a voltage transformer, which can achieve one-time molding by automatic pressure gel injection, and can not only meet the role played by the molding die in producing products, but also greatly improve the quality and production efficiency, and can save a lot of manpower, material resources and financial resources.

[0026] The invention provides an automatic pressure gel injection process and a mold for a voltage transformer, which can not only reduce the viscosity of the epoxy resin system, stabilize the gel time, but also improve the crack resistance of the epoxy resin system. The product has a small local discharge and a stable glass transition temperature. At the same time, the enlarged filler ratio can reduce the manufacturing cost.

[0027] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0028] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 It is a flowchart of the automatic pressure gel injection process of a voltage transformer in one embodiment of the present invention;

[0031] Figure 2 It is a structural schematic diagram of an automatic pressure gel injection mold for a voltage transformer in another embodiment of the present invention;

[0032] Figure 3 It is a left side view of an automatic pressure gel injection mold for a voltage transformer in another embodiment of the present invention;

[0033] Figure 4 It is a schematic diagram of the mold closing movement of the movable mold in the automatic pressure gel injection mold of the voltage transformer in another embodiment of the present invention.

[0034] In the figure: 1-static mold; 2-movable mold; 3-upper mold; 4-lower mold; 5-left mold; 6-right mold; 7-pressure gauge; 81-first thermocouple; 82-second thermocouple; 83-third thermocouple; 84-fourth thermocouple; 9-inflation valve; 10-deflation valve; 11-injection port valve; 12-static mold plate of automatic pressure gelation equipment; 13-movable mold plate of automatic pressure gelation equipment; 14-upper mold sub-plate; 15-thermocouple pressing plate; 16-demolding pull plate. DETAILED DESCRIPTION

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0037] See also Figure 1 As shown, an embodiment of the present invention provides a voltage transformer automatic pressure gel injection process, comprising the following steps:

[0038] Step S1: preparing epoxy resin mixture using static mixing equipment;

[0039] Step S2: The voltage transformer body coil is molded, and the mold is heated to a set temperature and maintained at a constant temperature;

[0040] Step S3: the injection cavity of the mold is first evacuated, then filled with SF6 gas, and then depressurized to normal pressure, so that the injection cavity of the mold is in an SF6 gas insulation environment;

[0041] Step S4: Automatically injecting the epoxy resin mixture into the mold through an automatic pressure gel device;

[0042] Specifically, the pressure gel equipment automatically controls the system to inject and fill the mixture under pressure. The injection pressure of the epoxy resin mixture is 0.10-0.15MPa (1.0-1.5kgf). The injection speed is slowed down at the beginning and controlled at 1-2kg per minute. When the injection weight exceeds 6kg, the total filling time is controlled at 10-12min.

[0043] Step S5: Controlling the curing of the epoxy resin mixture gel by a mold constant temperature automatic control system;

[0044] After the injection cavity of the mold is filled, maintain the pressure at 0.35-0.4MPa for 60±1min to allow the gel to solidify, and then remove the mold after solidification;

[0045] Step S6: demold and remove the injection molding body, and continue the post-curing; after the mold is assembled, the subsequent operations such as re-molding can be repeated; specifically, the mold is removed to remove burrs, and the product is unloaded and put into the furnace within 20 minutes to continue curing. The post-curing oven is kept at a constant temperature of 135±5℃ for at least 12 hours, and then the temperature is uniformly reduced to 50℃ after 6 hours before being taken out. The entire automatic pressure gel process operation is completed.

[0046] In an embodiment of the present invention, in step S1, an epoxy resin mixture is prepared by using an automatic control system of a static mixing equipment. The pre-baking and preparation of raw materials such as epoxy resin, curing agent, filler and colorant are automatically completed in the control system of the static mixing equipment. First, epoxy resin, filler and colorant are added to the A material preparation kettle in proportion. Specifically, the temperature is 75°C-80°C, stirred at a uniform speed for at least 1 hour, and the vacuum degree is 2-4mbar. The curing agent and filler are added to the B material preparation kettle in proportion. Specifically, the temperature is 70°C-75°C, stirred at a uniform speed for at least 1 hour, and the vacuum degree is 2-4mbar. Then, the A material preparation kettle and the B material preparation kettle are introduced into the static mixer in proportion, and a clean scoop is used to discharge one stroke of mixing from the A kettle and the B kettle respectively, and the ratio is verified. Specifically, the mixing temperature is 70-75°C, and pressure injection is prepared.

[0047] In an embodiment of the present invention, in step S2, the pre-baking temperature of the left and right walls of the mold is 120-130°C; the pre-baking temperature of the top and rear of the mold is 115-120°C, and the pre-baking temperature of the bottom of the mold and the movable mold is 110-115°C.

[0048] In the embodiment of the present invention, in step S3, the mold is evacuated to an ultimate vacuum below -0.1 MPa and maintained for 2 minutes; SF6 gas is filled to 0.05-0.1 MPa, maintained for 2 minutes, and then the pressure is released to normal pressure 0 MPa to start injection.

[0049] The automatic pressure gel injection process for a voltage transformer provided by the present invention has the following advantages:

[0050] By combining the automatic pressure gel equipment with the static mixing equipment, filling with SF6 gas, preparing materials, mixing materials, injection insulation, pressure maintenance, and gel curing are all completed automatically. The overall process plan is simple and easy to operate.

[0051] Short gel curing time and shortened production cycle: The product is made by automatic pressure gel equipment, epoxy resin static mixing equipment has a short mixing cycle, short gel curing time, and shortened production cycle;

[0052] High mechanical and electrical strength, small partial discharge: The product adopts static mixer pressure injection, the solidified material has high density, high mechanical and electrical strength, and is filled with SF6 gas, with high partial discharge starting voltage and small partial discharge, so the product can operate safely;

[0053] The viscosity of the mixed material is small, and the gel time and glass transition temperature are stable: static mixing equipment is used to prepare the materials for premixing. The static mixer has accurate proportions and can be used immediately after mixing. The viscosity of the mixed material is small, and the gel time and glass transition temperature are stable.

[0054] Another embodiment of the present invention provides a mold for realizing the automatic pressure gel injection process of the voltage transformer in the above embodiment. The mold is arranged on the automatic pressure gel equipment. The automatic pressure gel injection is formed in one step, which can not only meet the role of the molded mold in producing products, but also greatly improve the quality and production efficiency, and save a lot of manpower, material resources and financial resources. Figures 2 to 4 As shown, the mold includes a static mold assembly and a dynamic mold 2, wherein the static mold assembly is arranged on a static mold plate 12 of an automatic pressure gel device, and the dynamic mold 2 is arranged on a dynamic mold plate 13 of an automatic pressure gel device. The static mold assembly is provided with an inflation valve 9, an air release valve 10, an injection port valve 11 and a thermocouple, and the voltage transformer body coil is hoisted in the static mold assembly; when the dynamic mold plate 13 of the automatic pressure gel device drives the dynamic mold 2 to close the mold with the static mold assembly, a closed injection cavity is formed; after the mold reaches the set temperature through the thermocouple, vacuuming, inflation, pressure relief and injection processes are carried out, and the injection process is completed in an insulating gas environment.

[0055] See also Figures 2 to 4 As shown, in the embodiment of the present invention, the static mold assembly includes a static mold 1, an upper mold 3, a lower mold 4, a left mold 5 and a right mold 6, wherein the static mold 1 is connected to the static mold plate 12 of the automatic pressure gel device, the upper mold 3, the lower mold 4, the left mold 5 and the right mold 6 are combined into a square frame structure and sealedly connected to the static mold 1, the thermocouple is arranged on the upper mold 3, the lower mold 4, the left mold 5 and the right mold 6, and the voltage transformer body coil is installed on the upper mold 3. After the movable mold 2 and the static mold assembly are molded together, the movable mold 2 and the static mold assembly are connected by a demoulding pull plate 16.

[0056] In the embodiment of the present invention, grooves for installing thermocouples are provided on the outer surfaces of the upper mold 3, the lower mold 4, the left mold 5 and the right mold 6, and each thermocouple is pressed and fixed by a thermocouple pressing plate 15; multiple thermocouples are connected to the mold constant temperature automatic control system. Specifically, a first thermocouple 81 is provided on the left mold 5, a second thermocouple 82 is provided on the lower mold 4, a third thermocouple 83 is provided on the right mold 6, and a fourth thermocouple 84 is provided on the upper mold 3. Since the static mold 1 is fixed on the static mold plate 12 of the automatic pressure gelation equipment, and the dynamic mold 2 is fixed on the dynamic mold plate 13 of the automatic pressure gelation equipment, the static mold 1 and the dynamic mold 2 do not need to carry thermocouples, and are heated by the static mold plate 12 of the automatic pressure gelation equipment and the dynamic mold plate 13 of the automatic pressure gelation equipment to make the overall temperature of the mold consistent.

[0057] Furthermore, an inflation port and an air release port are arranged on the upper mold 3, and an inflation valve 9 and an air release valve 10 are arranged on the inflation port and the air release port respectively; an upper mold sub-plate 14 for installing the voltage transformer body coil is arranged on the inner side of the upper mold 3; an injection port is arranged at the lower part of the left mold 5 or the right mold 6, and an injection port valve 11 is arranged on the injection port.

[0058] See also Figures 2 to 4As shown, the inner surfaces of the static mold assembly and the movable mold 2 are electroplated with chrome to increase hardness, extend service life, reduce material costs, and improve production efficiency.

[0059] When in use, first fix the static mold 1 and the dynamic mold 2 to the static mold plate 12 and the dynamic mold plate 13 of the automatic pressure gel equipment respectively for preheating; then fix the preheated voltage transformer body coil on the upper mold sub-plate 14, and then fix the upper mold sub-plate 14 together with the voltage transformer body coil on the upper mold 3, assemble the upper mold 3, the lower mold 4, the left mold 5, the right mold 6 together with the inflation valve 9 and the deflation valve 10, the injection port valve 11 and the fixing bolts and fix them on the static mold 1, start the hydraulic device of the automatic pressure gel equipment, translate the dynamic mold 2 through the dynamic mold plate 13 of the automatic pressure gel equipment, close the mold, and finally fix the demoulding pull plate 16 on the left mold 5, and the automatic control system of the pressure gel equipment keeps the temperature and pressure.

[0060] Specifically, the pre-baking temperature of the left mold 5 and the right mold 6 is 120-130°C; the pre-baking temperature of the upper mold 3 and the static mold 1 is 115-120°C, and the pre-baking temperature of the lower mold 4 and the movable mold 2 is 110-115°C. The temperature of the upper mold 3 and the static mold 1 is 5-10°C higher than that of the lower mold 4 and the movable mold 2.

[0061] Furthermore, the deflation valve 10 is connected to the pressure gauge and the vacuum pump, the inflation valve 9 is connected to the SF6 gas bottle, and the injection port valve 11 is connected to the static mixer. Before work, all valves are opened, the thermocouples of the upper mold 3, the lower mold 4, the left mold 5, and the right mold 6 are heated, and the template heating plate of the automatic pressure gel equipment starts heating. When the temperature reaches the set temperature, the inflation valve 9 and the injection port valve 11 are closed; the vacuum pump is started, and the vacuum is started. When the pressure gauge 7 indicates -0.1Mpa, the vacuum is stopped; the inflation valve 9 and the SF6 gas bottle valve are opened to start inflation. When the pressure gauge 7 indicates 0.2Mpa, the inflation valve 9 is closed, and the inflation is stopped. After standing for 2 minutes, the deflation valve 10 is closed. Disassemble the evacuation pipeline, then open the deflation valve 10, release the pressure to the normal pressure gauge 7 indicating 0Mpa, close the deflation valve 10, and the SF6 gas is recovered through the gas recovery device. After the static mixture is prepared, first beat out a part of the mixture, then connect the injection port, open the injection port valve 11, and start injecting the mixture. The injection pressure on the static mixer operation interface is maintained at 0.3-0.4Mpa, and after about 5 minutes to ensure full injection, stop injection. Keep the temperature and pressure for 60±1min for demoulding, use the demoulding pull plate 16 to ensure that the movable mold 2 is separated from the upper mold 3, the lower mold 4, the left mold 5, and the right mold 6, use a forklift to remove the upper mold 3, the lower mold 4, the left mold 5, and the right mold 6 from the static mold 1 on all sides, place them on the workbench, take out the injection body and put it into the furnace for heating, continue the post-curing, assemble the mold and continue the next mold loading operation, and the entire mold loading, inflation, injection, and demoulding operation process is completed.

[0062] Another embodiment of the present invention provides an automatic pressure gel injection mold for a voltage transformer, which is divided into a six-sided cavity, and the inner surface is electroplated with chrome to increase hardness and extend service life, reduce material costs, and improve production efficiency; a thermocouple heating and constant temperature device is provided, valves and double sealing strips are provided, SF6 gas is evacuated and filled, and the seal is provided with a gas recovery device. The overall scheme of the present invention is simple and easy to operate; the mold is provided with a thermocouple heating and constant temperature device to ensure that the overall temperature of the mold is consistent, ensure that the resin gel cures quickly, shorten the production cycle, have high mechanical and electrical strength, small local discharge, and improve product quality; the mold is provided with valves and double sealing strips, has a sealing function, evacuates and pressurizes, has a small pressure relief ratio, SF6 inflation does not leak, and pressure gel injection is environmentally friendly and safe.

[0063] The above embodiments show that the automatic pressure gel injection process and mold for a voltage transformer provided by the present invention have the advantages of simple scheme, convenient operation, short gel curing time, shortened production cycle, high mechanical and electrical strength, and small partial discharge. The epoxy resin system of this process has low viscosity, stable gel time and glass transition temperature, strong crack resistance, high mechanical and electrical strength, high partial discharge starting voltage, small partial discharge, low production cost, and is suitable for assembly line operation. The product is suitable for installation and operation in special fields such as harsh environment, large temperature difference, and high altitude areas.

[0064] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A voltage transformer automatic pressure gel injection process, characterized in that: The following steps are involved: Step S1: preparing epoxy resin mixture using static mixing equipment; Step S2: The voltage transformer body coil is molded, and the mold is heated to a set temperature and maintained at a constant temperature; Step S3: the injection cavity of the mold is first evacuated, then filled with SF6 gas, and then depressurized to normal pressure, so that the injection cavity of the mold is in an SF6 gas insulation environment; Step S4: Automatically injecting the epoxy resin mixture into the mold through an automatic pressure gel device; The injection pressure of the epoxy resin mixture is 0.10-0.15MPa. The injection speed is controlled at 1-2kg per minute at the beginning. When the injection weight exceeds 6kg, the total filling time is controlled at 10-12min. Step S5: Controlling the curing of the epoxy resin mixture gel by a mold constant temperature automatic control system; After the injection cavity of the mold is filled, maintain the pressure at 0.35-0.4MPa for 60±1min, and remove the mold after solidification; Step S6: demoulding and taking out the injection molding body, and continuing the post-curing; The post-curing oven is kept at a constant temperature of 135±5℃ for at least 12h, then cooled to 50℃ at a constant speed over 6h before being taken out; In step S3, the mold is evacuated to an ultimate vacuum of less than -0.1 MPa and maintained for 2 minutes; SF6 gas is filled to 0.05-0.1 MPa, maintained for 2 minutes, and then the pressure is released to normal pressure 0 MPa, and injection begins; In step S1, an epoxy resin mixture is prepared using an automatic control system of a static mixer, and the temperature of the static mixer mixture is 70-75° C.; In step S2, the pre-baking temperature of the left and right walls of the mold is 120-130°C; the pre-baking temperature of the top and rear of the mold is 115-120°C, and the pre-baking temperature of the bottom of the mold and the movable mold is 110-115°C.

2. A mold for realizing the automatic pressure gel injection process of a voltage transformer according to claim 1, which is arranged on an automatic pressure gel device, characterized in that: The mold comprises a static mold assembly and a dynamic mold (2), wherein the static mold assembly is arranged on a static mold plate (12) of an automatic pressure gelling device, and the dynamic mold (2) is arranged on a dynamic mold plate (13) of the automatic pressure gelling device, and an inflation valve (9), an air release valve (10), an injection port valve (11) and a thermocouple are provided on the static mold assembly, and the voltage transformer body coil is hoisted in the static mold assembly; when the dynamic mold plate (13) of the automatic pressure gelling device drives the dynamic mold (2) to close the static mold assembly, a closed injection cavity is formed; after the mold reaches a set temperature through the thermocouple, a vacuuming, inflation, pressure relief and injection process are performed, and the injection process is completed in an insulating gas environment; The static mold assembly comprises a static mold (1), an upper mold (3), a lower mold (4), a left mold (5) and a right mold (6), wherein the static mold (1) is connected to a static mold plate (12) of an automatic pressure gelling device, the upper mold (3), the lower mold (4), the left mold (5) and the right mold (6) are combined into a square frame structure and sealedly connected to the static mold (1), the thermocouple is arranged on the upper mold (3), the lower mold (4), the left mold (5) and the right mold (6), and the voltage transformer body coil is installed on the upper mold (3); After the movable mold (2) and the static mold assembly are molded together, the movable mold (2) and the static mold assembly are connected via a demoulding pull plate (16).

3. The automatic pressure gel injection mold for voltage transformer according to claim 2, characterized in that: The outer surfaces of the upper mold (3), the lower mold (4), the left mold (5) and the right mold (6) are provided with grooves for installing the thermocouples, and the thermocouples are pressed and fixed by a thermocouple pressing plate (15); the plurality of thermocouples are connected to a mold constant temperature automatic control system.

4. The automatic pressure gel injection mold for voltage transformer according to claim 2, characterized in that: The upper mold (3) is provided with an inflation port and an deflation port, the inflation valve (9) and the deflation valve (10) are respectively provided on the inflation port and the deflation port, and an upper mold sub-plate (14) for mounting the voltage transformer body coil is provided on the inner side of the upper mold (3); a material injection port is provided at the lower part of the left mold (5) or the right mold (6), and the material injection port valve (11) is provided on the material injection port.

5. The automatic pressure gel injection mold for voltage transformer according to claim 2, characterized in that: The inner surfaces of the static mold assembly and the movable mold (2) are electroplated with chrome.

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