A vacuum pressure impregnation system suitable for insulating parts of high-voltage electrical equipment

Abstract

The present invention relates to the field of vacuum pressure impregnation technology, and in particular to a vacuum pressure impregnation system suitable for high-voltage electrical equipment insulating components, comprising: an impregnation module, comprising an impregnation tank and a liquid level measurement unit, for impregnating the insulating components; a vacuum module, connected to the impregnation tank, comprising a vacuum pump and a vacuum degree monitoring unit; a pressurizing module, connected to the impregnation tank, comprising a pressurizing unit and a pressure monitoring unit; a curing module, connected to the impregnation tank, for leaching and drying the impregnated insulating components; a detection module, connected to the curing module, comprising an image recognition unit and a performance detection unit; and a control module, for performing a secondary assessment of the impregnation quality based on the impregnation integrity and uniformity evaluation values ​​of the paint film, under the condition that the impregnation quality is determined to be qualified based on the surface defect characterization values ​​of the cured insulating components. The present invention improves the impregnation quality and efficiency of insulating components.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum pressure impregnation, in particular to a vacuum pressure impregnation system suitable for insulating parts of high-voltage electrical equipment. Background Art

[0002] The insulation components of high-voltage electrical equipment (such as transformers, mutual inductors, circuit breakers, and GIS) are core components that ensure safe and reliable operation. Their insulation performance is directly related to the equipment's withstand voltage, partial discharge characteristics, and long-term stability. Traditional atmospheric impregnation processes can lead to residual bubbles within the insulating material and insufficient resin penetration, which can easily cause microscopic defects in the insulation layer and trigger partial discharge or insulation degradation under high-voltage electric fields. Vacuum pressure impregnation technology significantly improves the insulation's density, dielectric strength, and resistance to environmental corrosion by removing gas from the pores of the insulating material under a high vacuum and allowing the resin to fully penetrate under pressure.

[0003] Chinese patent application publication number: CN109261435A discloses a vacuum pressure impregnation system, which includes: a material conveying module and a vacuum impregnation device provided with a vacuum chamber; wherein the material conveying module is suitable for conveying a material to be impregnated to the vacuum impregnation device, and the vacuum chamber is suitable for placing a product to be impregnated. After the material to be impregnated enters the vacuum chamber, the vacuum impregnation device is suitable for impregnating the material to be impregnated into the product to be impregnated through vacuum pressure.

[0004] However, the existing technology has the following problems: the existing technology lacks real-time monitoring and feedback control of the impregnation process of insulating parts, and is difficult to adapt to the dynamic adjustment requirements of the impregnation of insulating parts with complex structures, resulting in uneven impregnation or defects. Summary of the Invention

[0005] To this end, the present invention provides a vacuum pressure impregnation system suitable for insulating parts of high-voltage electrical equipment, so as to overcome the problem in the prior art of poor impregnation quality caused by lack of monitoring of the impregnation process of insulating parts with complex structures.

[0006] To achieve the above object, the present invention provides a vacuum pressure impregnation system suitable for insulating parts of high-voltage electrical equipment, comprising:

[0007] An impregnation module, which is used to perform an impregnation treatment on the insulating member, and includes an impregnation tank for placing the insulating member and a liquid level measurement unit arranged inside the impregnation tank;

[0008] a vacuum module connected to the impregnation module, comprising a vacuum pump for evacuating the impregnation tank and a vacuum monitoring unit for monitoring the vacuum level inside the impregnation tank;

[0009] a pressurizing module connected to the impregnation module, comprising a pressurizing unit for pressurizing the impregnation tank and a pressure monitoring unit disposed inside the impregnation tank;

[0010] a curing module connected to the impregnation module for performing paint-draining and drying treatments on the impregnated insulation components;

[0011] An inspection module connected to the curing module includes an image recognition unit and a performance inspection unit for performing appearance inspection and performance inspection on the cured insulation member;

[0012] A control module is respectively connected to the pressurizing module, the curing module and the detection module, and is used to determine the acceptability of the impregnation based on the surface defect characterization value of the cured insulating part; if the impregnation is determined to be acceptable, the acceptability of the impregnation is secondary determined based on the impregnation integrity and uniformity evaluation values ​​of the paint film; if the impregnation is determined to be unacceptable, the cause of the unacceptability is determined based on the defect type and the pressurizing rate or the curing rate is reduced; if the impregnation is determined to be unacceptable for the second time, the pressure during the impregnation process is comprehensively determined based on the pore size of the insulating part and the viscosity of the insulating paint, or the cause of the unacceptable impregnation is determined based on the location of the unevenness and the viscosity of the insulating paint is adjusted.

[0013] Furthermore, the surface defect characterization value is determined by the crack length and bubble area existing on the surface of the solidified insulating member.

[0014] Furthermore, the control module determines the eligibility of the impregnation according to the surface defect characterization value of the cured insulating member, wherein if the surface defect characterization value is less than a preset defect characterization value, the impregnation is determined to be qualified, and the eligibility of the impregnation is re-determined according to the impregnation integrity and uniformity evaluation values ​​of the paint film;

[0015] If the surface defect characterization value is greater than or equal to the preset defect characterization value, the impregnation is determined to be unqualified, and the reason for the unqualified impregnation is determined based on the type of defect present.

[0016] Furthermore, based on the condition that the impregnation completeness is less than a preset completeness, the impregnation is judged as unqualified for a second time, and the pressure during the impregnation process is comprehensively determined based on the pore size of the insulating member and the viscosity of the insulating varnish;

[0017] Based on the condition that the impregnation completeness is greater than or equal to the preset completeness, the eligibility of the impregnation is secondarily determined according to the uniformity evaluation value.

[0018] Furthermore, the pressure during the dipping process is determined based on the pore size of the insulating member and the viscosity of the insulating varnish, wherein if the pore size of the insulating member is smaller than a preset pore size and the viscosity of the insulating varnish is smaller than a preset viscosity, the pressure during the dipping process is determined to be a first pressure;

[0019] If the pore size of the insulating member is smaller than the preset pore size and the viscosity of the insulating varnish is greater than or equal to the preset viscosity, determining the pressure during the dipping process to be the second pressure;

[0020] If the pore size of the insulating member is greater than or equal to the preset pore size and the viscosity of the insulating varnish is less than the preset viscosity, determining the pressure during the dipping process to be the third pressure;

[0021] If the pore size of the insulating member is greater than or equal to the preset pore size and the viscosity of the insulating varnish is greater than or equal to the preset viscosity, the pressure during the dipping process is determined to be the fourth pressure.

[0022] Furthermore, if the uniformity evaluation value is less than a preset evaluation value, the impregnation is determined to be unqualified for a second time, and the reason for the unqualified impregnation is determined according to the location of the unevenness;

[0023] If the uniformity evaluation value is greater than or equal to the preset evaluation value, the impregnation is judged as qualified for the second time, and a performance test is performed on the insulating component.

[0024] Furthermore, the uniformity evaluation value is determined by color dispersion and gloss uniformity.

[0025] Furthermore, the cause of the impregnation failure is determined based on the defect type of the insulating component. If the defect type is bubbles, the cause of the impregnation failure is determined to be an excessively fast pressurization rate, and the pressurization rate is reduced based on the actual bubble area ratio. The pressurization rate is negatively correlated with the actual bubble area ratio.

[0026] If the defect type is crack, the reason for the impregnation failure is determined to be an excessively fast curing rate, and the curing rate is reduced according to a crack characterization value determined by the number and length of the cracks, wherein the curing rate is negatively correlated with the crack characterization value.

[0027] Furthermore, the cause of the impregnation failure is determined based on the location of the uneven impregnation of the insulating part. If the uneven impregnation occurs at the edge of the insulating part, the cause of the impregnation failure is determined to be too low a viscosity of the insulating varnish, and the viscosity of the insulating varnish is increased based on the dripping rate of the insulating varnish within a preset time during dripping.

[0028] If there is unevenness on the top surface during the dip, it is determined that the reason for the unqualified dipping is that the viscosity of the insulating paint is too high, and the viscosity of the insulating paint is reduced according to the proportion of the uneven area.

[0029] Furthermore, several adjustment methods are provided for the viscosity of the insulating varnish, and each adjustment method has a different adjustment range for the viscosity of the insulating varnish.

[0030] Compared with the prior art, the beneficial effect of the present invention lies in that the present invention jointly determines the surface defect characterization value by the crack length and bubble area existing on the surface of the solidified insulating part, and judges the acceptability of the impregnation based on the surface defect characterization value of the solidified insulating part, performs a secondary judgment under the qualified condition, and determines the cause of the unqualified condition under the unqualified condition, thereby improving the detection efficiency through graded judgment.

[0031] Furthermore, the present invention determines the uniformity evaluation value through color dispersion and gloss uniformity, and makes a secondary judgment on the acceptability of the impregnation based on the impregnation completeness and uniformity evaluation value of the paint film. When it is unqualified, the pressure during the impregnation process is comprehensively determined based on the pore size of the insulating part and the viscosity of the insulating paint. The accuracy of the detection is improved through double judgment. By comprehensively considering these two factors to determine the impregnation pressure, the process parameters can be adjusted more accurately, so that the insulating paint can better penetrate into the pores of the insulating part, thereby improving the impregnation quality.

[0032] Furthermore, the present invention determines the cause of impregnation failure based on the type of defects in the insulating parts and reduces the pressurization rate or curing rate accordingly. By setting an intelligent adjustment method, it can solve the problems arising in the impregnation process in a targeted manner and optimize the impregnation effect.

[0033] Furthermore, the present invention can solve the problem of uneven impregnation in a targeted manner and further optimize the impregnation effect by determining the cause of failure based on the location of the uneven impregnation and adjusting the viscosity of the insulating varnish accordingly. By providing several adjustment methods for the viscosity of the insulating varnish, the viscosity of the insulating varnish can be flexibly adjusted, thereby ensuring the stability and reliability of the impregnation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of module connections of a vacuum pressure impregnation system applicable to insulating components of high-voltage electrical equipment according to an embodiment of the present invention;

[0035] Figure 2 This is a flow chart of determining the eligibility of impregnation according to the surface defect characterization value of the cured insulating part according to an embodiment of the present invention;

[0036] Figure 3 This is a flow chart of a secondary determination of the eligibility of impregnation based on the impregnation integrity and uniformity evaluation values ​​of the paint film according to an embodiment of the present invention;

[0037] Figure 4 The flowchart of an embodiment of the present invention is to determine the cause of impregnation failure according to the existing defect type. DETAILED DESCRIPTION

[0038] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0039] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0040] It should be pointed out that the data in this embodiment are obtained by comprehensive analysis and evaluation of the historical test data and the corresponding historical test results of the three months before this test. It can be understood by those skilled in the art that the present invention can determine the above parameters for a single item by selecting the value with the highest proportion as the preset standard parameter based on the data distribution, using weighted summation to use the obtained value as the preset standard parameter, substituting each historical data into a specific formula and using the value obtained by the formula as the preset standard parameter or other selection methods, as long as the present invention can clearly define the different specific situations in the single determination process through the obtained values.

[0041] See also Figures 1 to 4 As shown, they are respectively a schematic diagram of the module connection of a vacuum pressure impregnation system for insulating parts of high-voltage electrical equipment according to an embodiment of the present invention; a flow chart of judging the acceptability of impregnation according to the surface defect characterization value of the cured insulating part according to an embodiment of the present invention; a flow chart of secondary judging the acceptability of impregnation according to the impregnation integrity and uniformity evaluation value of the paint film according to an embodiment of the present invention; and a flow chart of determining the cause of unqualified impregnation according to the type of defects present according to an embodiment of the present invention.

[0042] The embodiment of the present invention is applicable to a vacuum pressure impregnation system for insulating parts of high-voltage electrical equipment, comprising:

[0043] An impregnation module, which is used to perform an impregnation treatment on the insulating member, and includes an impregnation tank for placing the insulating member and a liquid level measurement unit arranged inside the impregnation tank;

[0044] a vacuum module connected to the impregnation module, comprising a vacuum pump for evacuating the impregnation tank and a vacuum monitoring unit for monitoring the vacuum level inside the impregnation tank;

[0045] a pressurizing module connected to the impregnation module, comprising a pressurizing unit for pressurizing the impregnation tank and a pressure monitoring unit disposed inside the impregnation tank;

[0046] a curing module connected to the impregnation module for performing paint-draining and drying treatments on the impregnated insulation components;

[0047] An inspection module connected to the curing module includes an image recognition unit and a performance inspection unit for performing appearance inspection and performance inspection on the cured insulation member;

[0048] A control module is respectively connected to the pressurizing module, the curing module and the detection module, and is used to determine the acceptability of the impregnation based on the surface defect characterization value of the cured insulating part; if the impregnation is determined to be acceptable, the acceptability of the impregnation is secondary determined based on the impregnation integrity and uniformity evaluation values ​​of the paint film; if the impregnation is determined to be unacceptable, the cause of the unacceptability is determined based on the defect type and the pressurizing rate or the curing rate is reduced; if the impregnation is determined to be unacceptable for the second time, the pressure during the impregnation process is comprehensively determined based on the pore size of the insulating part and the viscosity of the insulating paint, or the cause of the unacceptable impregnation is determined based on the location of the unevenness and the viscosity of the insulating paint is adjusted.

[0049] Specifically, the liquid level measuring unit, such as an ultrasonic liquid level meter, a radar liquid level meter, etc., is not specifically limited. The liquid level height of the insulating paint is determined and set by obtaining the size information of the insulating part in advance. At the same time, a camera is also provided in the dipping barrel to observe the immersion of the insulating paint on the insulating part.

[0050] Specifically, the vacuum degree monitoring unit is, for example, a thermocouple vacuum gauge, an ionization vacuum gauge, etc., and is not specifically limited, and only needs to control the vacuum degree within 0.095 to 0.099 MPa.

[0051] Specifically, the pressurizing unit is a gas compressor, and the pressure monitoring unit is a pressure sensor.

[0052] Specifically, the curing module dries the insulating parts after the paint is applied through an infrared drying oven.

[0053] Specifically, the image recognition unit includes an industrial camera for obtaining defects such as cracks and bubbles on the surface of the insulating part, impregnation completeness and color dispersion, an optical micro probe for observing the impregnation completeness inside the hole, and a gloss meter for obtaining gloss uniformity.

[0054] Specifically, the performance detection unit includes but is not limited to an insulation resistance tester, a dielectric strength tester, etc., which is used to detect the insulation resistance of the insulating part, evaluate its insulation performance, detect the breakdown voltage of the insulating part under the action of the electric field, and determine whether its dielectric strength meets the requirements.

[0055] Specifically, the surface defect characterization value is determined by the crack length and bubble area existing on the surface of the solidified insulating part. The surface defect characterization value = crack weight coefficient × total crack length / preset total crack length + bubble weight coefficient × bubble area / preset bubble area, wherein the total crack length is the sum of the lengths of all cracks, the crack weight coefficient is 0.6, the preset total crack length is 8 mm, the bubble weight coefficient is 0.4, and the preset bubble area is 10 mm 2 .

[0056] Specifically, the control module determines the eligibility of the impregnation according to the surface defect characterization value of the cured insulating member, wherein if the surface defect characterization value is less than a preset defect characterization value of 0.8, the impregnation is determined to be qualified, and the eligibility of the impregnation is re-determined according to the impregnation integrity and uniformity evaluation values ​​of the paint film;

[0057] If the surface defect characterization value is greater than or equal to the preset defect characterization value, the impregnation is determined to be unqualified, and the reason for the unqualified impregnation is determined based on the type of defect present.

[0058] In the embodiment of the present invention, the preset defect characterization value is 0.8, but the above value is not limited thereto, and those skilled in the art can adjust the value according to actual needs.

[0059] Specifically, based on the condition that the impregnation completeness is less than 98% of the preset completeness, the impregnation is judged as unqualified for the second time, and the pressure during the impregnation process is determined comprehensively based on the pore size of the insulating part and the viscosity of the insulating varnish;

[0060] Based on the condition that the impregnation completeness is greater than or equal to the preset completeness, the eligibility of the impregnation is secondarily determined according to the uniformity evaluation value.

[0061] In the embodiment of the present invention, the preset completeness value is 98%, but the above value is not limited thereto, and those skilled in the art can adjust the value according to actual needs.

[0062] Specifically, the impregnation completeness is the ratio of the impregnated area to the area of ​​the insulating component that needs to be impregnated.

[0063] Specifically, the pressure during the dipping process is determined based on the pore diameter of the insulating member and the viscosity of the insulating varnish. If the pore diameter of the insulating member is less than a preset pore diameter of 5 mm and the viscosity of the insulating varnish is less than a preset viscosity of 300 cP, the pressure during the dipping process is determined to be a first pressure of 0.3 MPa.

[0064] If the pore size of the insulating member is smaller than the preset pore size and the viscosity of the insulating varnish is greater than or equal to the preset viscosity, the pressure during the dipping process is determined to be a second pressure of 0.6 MPa;

[0065] If the pore size of the insulating member is greater than or equal to the preset pore size and the viscosity of the insulating varnish is less than the preset viscosity, the pressure during the dipping process is determined to be a third pressure of 0.2 MPa;

[0066] If the pore size of the insulating member is greater than or equal to the preset pore size and the viscosity of the insulating varnish is greater than or equal to the preset viscosity, the pressure during the dipping process is determined to be a fourth pressure of 0.5 MPa.

[0067] In an embodiment of the present invention, the preset pore size is 5 mm, the preset viscosity is 200 cP, the first pressure is 0.3 MPa, the second pressure is 0.6 MPa, the third pressure is 0.2 MPa, and the fourth pressure is 0.5 MPa, but the above values ​​are not limited to these. Those skilled in the art can adjust the above values ​​according to actual needs.

[0068] Specifically, if the uniformity evaluation value is less than a preset evaluation value of 0.9, the impregnation is determined to be unqualified for the second time, and the reason for the unqualified impregnation is determined based on the location of the unevenness;

[0069] If the uniformity evaluation value is greater than or equal to the preset evaluation value, the impregnation is judged as qualified for the second time, and a performance test is performed on the insulating component.

[0070] In the embodiment of the present invention, the preset evaluation value is 0.9, but the above value is not limited thereto, and those skilled in the art can adjust the value according to actual needs.

[0071] Specifically, the uniformity evaluation value is determined by color dispersion and gloss uniformity, and is calculated by the following formula: , in the formula, is the uniformity evaluation value, is the first weight coefficient, set =0.55, is the color dispersion, is the color dispersion threshold, set =3.0, is the second weight coefficient, set =0.45, is the gloss uniformity, is the gloss uniformity threshold, set =5.

[0072] Specifically, the color dispersion is the standard deviation of the color difference on the surface of the insulating part. It is obtained by collecting a number of images of the surface of the insulating part with an industrial camera, performing color calibration, and then calculating using image analysis software.

[0073] Specifically, the gloss uniformity is the standard deviation of the surface gloss of the insulating part, which is measured by marking measurement points on the surface of the insulating part using a gloss meter according to the grid method and obtained by software calculation. The grid specifications are not specifically limited and can be determined according to the actual size of the insulating part.

[0074] Specifically, the cause of impregnation failure is determined based on the defect type of the insulating part. If the defect type is bubbles, the cause of impregnation failure is determined to be excessive pressurization rate, and the pressurization rate is reduced based on the actual bubble area ratio. The pressurization rate is negatively correlated with the actual bubble area ratio.

[0075] If the defect type is crack, the reason for the impregnation failure is determined to be an excessively fast curing rate, and the curing rate is reduced according to a crack characterization value determined by the number and length of the cracks, wherein the curing rate is negatively correlated with the crack characterization value.

[0076] Specifically, during the impregnation process, the resin needs to fully penetrate the internal pores of the insulating parts. If the pressurization rate is too fast, the viscous resistance of the resin will prevent it from filling the tiny pores in time. The gas will be quickly compressed but not completely discharged, forming closed bubbles. Therefore, if the defect type is bubbles, it is determined that the reason for the unqualified impregnation is that the pressurization rate is too fast.

[0077] Specifically, the resin shrinks in volume when it cures. If the curing rate is too fast, the surface quickly cures to form a rigid shell, while the interior remains in a liquid or semi-solid state, resulting in uneven distribution of shrinkage stress. The shrinkage caused by the delayed internal curing is constrained by the surface. When the stress exceeds the tensile strength of the material, microcracks will expand. Therefore, if the defect type is cracks, it is determined that the reason for the unqualified impregnation is that the curing rate is too fast.

[0078] Specifically, the actual bubble area ratio is the ratio of the bubble area to the impregnation area, and the crack characterization value = the number of cracks × the average length of the cracks.

[0079] Specifically, the pressurization rate is reduced according to the actual bubble area ratio. If the actual bubble area ratio is less than the first preset area ratio of 0.5%, the pressurization rate is reduced to the corresponding value using the first rate adjustment coefficient of 0.95.

[0080] If the actual bubble area ratio is greater than or equal to the first preset area ratio and less than 0.8% of the second preset area ratio, the pressurization rate is reduced to the corresponding value using the second rate adjustment coefficient of 0.91;

[0081] If the actual bubble area ratio is greater than or equal to the second preset area ratio, the pressurization rate is reduced to the corresponding value using the third rate adjustment coefficient 0.86.

[0082] In an embodiment of the present invention, the initial pressurization rate is 0.3 MPa / min, the first preset area ratio is 0.5%, and the second preset area ratio is 0.8%, but the above values ​​are not limited to these. Those skilled in the art can adjust the above values ​​according to actual needs.

[0083] Specifically, the initial curing rate is 2°C / min, and the curing rate can be adjusted in the range of 0.5 to 2°C / min.

[0084] Specifically, the cause of the impregnation failure is determined based on the location of the uneven impregnation of the insulating part. If the uneven impregnation exists at the edge of the insulating part, the cause of the impregnation failure is determined to be too low a viscosity of the insulating varnish. The viscosity of the insulating varnish is increased based on the dripping rate of the insulating varnish within a preset time of 1 minute during dripping.

[0085] If there is unevenness on the top surface during the dip, it is determined that the reason for the unqualified dipping is that the viscosity of the insulating paint is too high, and the viscosity of the insulating paint is reduced according to the proportion of the uneven area.

[0086] Specifically, several adjustment methods are provided for the viscosity of the insulating paint, and each adjustment method has a different adjustment range for the viscosity of the insulating paint. Based on the condition that the viscosity of the insulating paint is too low, the viscosity of the insulating paint is positively correlated with the dripping rate. Among them, if the dripping rate is less than the first preset rate of 10mL / min, the first viscosity adjustment coefficient of 1.2 is used to increase the viscosity of the insulating paint to the corresponding value;

[0087] If the dripping rate is greater than or equal to the first preset rate and less than the second preset rate of 20 mL / min, the viscosity of the insulating varnish is increased to a corresponding value using a second viscosity adjustment coefficient of 1.5;

[0088] If the dripping rate is greater than or equal to the second preset rate, the viscosity of the insulating varnish is increased to a corresponding value using a third viscosity adjustment coefficient of 1.8.

[0089] In the embodiment of the present invention, the first preset rate is 10 mL / min, and the second preset rate is 20 mL / min, but the above values ​​are not limited thereto. Those skilled in the art may adjust the above values ​​according to actual needs.

[0090] Specifically, based on the condition that the viscosity of the insulating varnish is too high, the viscosity of the insulating varnish is negatively correlated with the uneven area ratio, and the adjustment range of the viscosity of the insulating varnish is 200 to 500 cP.

[0091] The working principle of the vacuum pressure impregnation system for insulating components of high-voltage electrical equipment according to the embodiment of the present invention is as follows:

[0092] The pre-baked and dehumidified insulating parts are placed in the impregnation tank, and the impregnation tank is evacuated by the vacuum module. When the vacuum degree is greater than the preset vacuum degree of 0.095MPa, insulating varnish is introduced into the impregnation tank until the insulating varnish covers the insulating parts and reaches the predetermined liquid level. The vacuum is then released, and dry compressed gas (nitrogen) is introduced into the impregnation tank through the pressurizing module to apply pressure to the insulating varnish for impregnation. After the impregnation is completed, the insulating parts are subjected to paint leaching and curing treatment. The insulating parts that have completed the curing treatment are visually inspected and the qualification of the impregnation is determined by the control module. Performance testing is then carried out based on the qualified conditions.

[0093] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

[0094] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A vacuum pressure impregnation system suitable for high voltage electrical equipment insulation parts, characterized in that: include: An impregnation module, which is used to perform an impregnation treatment on the insulating member, and includes an impregnation tank for placing the insulating member and a liquid level measurement unit arranged inside the impregnation tank; a vacuum module connected to the impregnation module, comprising a vacuum pump for evacuating the impregnation tank and a vacuum monitoring unit for monitoring the vacuum level inside the impregnation tank; a pressurizing module connected to the impregnation module, comprising a pressurizing unit for pressurizing the impregnation tank and a pressure monitoring unit disposed inside the impregnation tank; a curing module connected to the impregnation module for performing paint-draining and drying treatments on the impregnated insulation components; An inspection module connected to the curing module includes an image recognition unit and a performance inspection unit for performing appearance inspection and performance inspection on the cured insulation member; a control module, connected to the pressurizing module, curing module, and detection module, respectively, for determining the acceptability of the impregnation based on a surface defect characterization value of the cured insulating member; if the impregnation is deemed acceptable, performing a secondary evaluation of the acceptability of the impregnation based on the impregnation integrity and uniformity evaluation values ​​of the paint film; and if the impregnation is deemed unacceptable, determining the cause of the unacceptability based on the defect type, including failure to meet the pressurizing rate or the curing rate, wherein the surface defect characterization value is determined by a crack length and bubble area present on the surface of the cured insulating member; In response to the second determination that the impregnation is unqualified, the control module comprehensively determines the pressure during the impregnation process based on the pore size of the insulating member and the viscosity of the insulating varnish, or determines the cause of the impregnation failure based on the location of the unevenness and adjusts the viscosity of the insulating varnish; The control module determines the eligibility of the impregnation according to the surface defect characterization value of the cured insulating member, wherein if the surface defect characterization value is less than a preset defect characterization value, the impregnation is determined to be qualified, and the eligibility of the impregnation is re-determined according to the impregnation integrity and uniformity evaluation values ​​of the paint film; If the surface defect characterization value is greater than or equal to the preset defect characterization value, the impregnation is determined to be unqualified, and the reason for the unqualified impregnation is determined according to the type of defect present; Based on the condition that the impregnation completeness is less than the preset completeness, the impregnation is judged as unqualified for the second time, and the pressure during the impregnation process is comprehensively determined based on the pore size of the insulating part and the viscosity of the insulating varnish; Based on the condition that the impregnation completeness is greater than or equal to the preset completeness, secondarily determining the eligibility of the impregnation according to the uniformity evaluation value; Determining the pressure during the dipping process based on the pore size of the insulating member and the viscosity of the insulating varnish, wherein if the pore size of the insulating member is smaller than a preset pore size and the viscosity of the insulating varnish is smaller than a preset viscosity, determining the pressure during the dipping process as a first pressure; If the pore size of the insulating member is smaller than the preset pore size and the viscosity of the insulating varnish is greater than or equal to the preset viscosity, determining the pressure during the dipping process to be the second pressure; If the pore size of the insulating member is greater than or equal to the preset pore size and the viscosity of the insulating varnish is less than the preset viscosity, determining the pressure during the dipping process to be the third pressure; If the pore size of the insulating member is greater than or equal to the preset pore size and the viscosity of the insulating varnish is greater than or equal to the preset viscosity, determining the pressure during the dipping process to be a fourth pressure; If the uniformity evaluation value is less than the preset evaluation value, the impregnation is judged as unqualified for the second time, and the reason for the unqualified impregnation is determined according to the location of the unevenness; If the uniformity evaluation value is greater than or equal to the preset evaluation value, the impregnation is judged as qualified for the second time, and a performance test is performed on the insulating component.

2. The vacuum pressure impregnation system for insulating parts of high-voltage electrical equipment according to claim 1, characterized in that: The uniformity evaluation value is determined by color dispersion and gloss uniformity.

3. The vacuum pressure impregnation system for insulating parts of high-voltage electrical equipment according to claim 2, characterized in that: Determine the cause of impregnation failure based on the defect type of the insulating component. If the defect type is bubbles, determine that the cause of impregnation failure is excessively high pressurization rate, and reduce the pressurization rate based on the actual bubble area ratio. The pressurization rate is negatively correlated with the actual bubble area ratio. If the defect type is crack, the reason for the impregnation failure is determined to be an excessively fast curing rate, and the curing rate is reduced according to a crack characterization value determined by the number and length of the cracks, wherein the curing rate is negatively correlated with the crack characterization value.

4. The vacuum pressure impregnation system for insulating parts of high-voltage electrical equipment according to claim 3, characterized in that: Determining the cause of impregnation failure based on the location of the uneven impregnation of the insulating part. If the uneven impregnation occurs at the edge of the insulating part, the cause of the impregnation failure is determined to be too low a viscosity of the insulating varnish. The viscosity of the insulating varnish is increased based on the dripping rate of the insulating varnish within a preset time period during dripping. If there is unevenness on the top surface during the dip, it is determined that the reason for the unqualified dipping is that the viscosity of the insulating paint is too high, and the viscosity of the insulating paint is reduced according to the proportion of the uneven area.

5. The vacuum pressure impregnation system for insulating parts of high-voltage electrical equipment according to claim 4, characterized in that: There are several adjustment methods for the viscosity of the insulating varnish, and each adjustment method has a different adjustment range for the viscosity of the insulating varnish.

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