Vacuum pressure impregnation system suitable for insulating part of high-voltage electrical equipment

Abstract

The invention relates to the technical field of vacuum pressure impregnation, in particular to a vacuum pressure impregnation system suitable for an insulating part of high-voltage electrical equipment, comprising: an impregnation module which comprises an impregnation tank and a liquid level measurement unit and is used for performing impregnation treatment on the insulating part; the vacuum module is connected with the impregnating tank and comprises a vacuum pump and a vacuum degree monitoring unit; the pressurizing module is connected with the impregnating tank and comprises a pressurizing unit and a pressure monitoring unit; the curing module is connected with the impregnating tank and is used for carrying out paint draining and drying treatment on the impregnated insulating part; the detection module is connected with the curing module and comprises an image recognition unit and a performance detection unit; and the control module is used for carrying out secondary judgment on the impregnation qualification according to the impregnation integrity and uniformity evaluation value of the paint film under the condition that the impregnation qualification is judged according to the surface defect characterization value of the cured insulating part. According to the invention, the impregnation quality and efficiency of the insulating part are improved.

Description

Technical Field

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

[0002] Insulating parts of high-voltage electrical equipment (such as transformers, instrument transformers, circuit breakers, GIS, etc.) are core components to ensure the safe and reliable operation of the equipment, and their insulation performance is directly related to the withstand voltage strength, partial discharge characteristics and long-term stability of the equipment. Traditional atmospheric environment impregnation processes have problems such as residual air bubbles inside the insulating material and insufficient resin penetration, which easily lead to microscopic defects in the insulating layer and cause partial discharge or insulation aging under high-voltage electric fields. Vacuum pressure impregnation technology can significantly improve the density, dielectric strength and environmental corrosion resistance of insulating parts by removing the gas in the pores of the insulating material in a high-vacuum environment and allowing the resin to fully penetrate under pressure.

[0003] Chinese Patent Application Publication No.: 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 adapted to convey the material to be impregnated to the vacuum impregnation device, and the vacuum chamber is adapted to place the product to be impregnated. After the material to be impregnated enters the vacuum chamber, the vacuum impregnation device is adapted to impregnate the material to be impregnated into the product to be impregnated through vacuum pressure.

[0004] However, the following problems exist in the prior art: The prior art lacks real-time monitoring and feedback control for the impregnation process of insulating parts, and it is difficult to meet the dynamic adjustment requirements for impregnating insulating parts with complex structures, resulting in uneven impregnation or defects. Summary of the Invention

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

[0006] To achieve the above object, the present invention provides a vacuum pressure impregnation system applicable to insulating parts of high-voltage electrical equipment, including: An impregnation module for impregnating the insulating parts, including an impregnation tank for placing the insulating parts and a liquid level measuring unit provided inside the impregnation tank; A vacuum module connected to the impregnation module, including a vacuum pump for evacuating the impregnation tank and a vacuum degree monitoring unit for monitoring the vacuum degree inside the impregnation tank; A pressurizing module, which is connected to the impregnation module, includes a pressurizing unit for pressurizing the impregnation tank and a pressure monitoring unit disposed inside the impregnation tank; A curing module, which is connected to the impregnation module, is used for draining paint and drying the impregnated insulating parts; A detection module, which is connected to the curing module, includes an image recognition unit and a performance detection unit for performing appearance detection and performance detection on the cured insulating parts; A control module, which is respectively connected to the pressurizing module, the curing module and the detection module, is used for determining the qualification of impregnation according to the surface defect characterization value of the cured insulating parts, performing a secondary determination of the qualification of impregnation according to the evaluation values of the impregnation integrity and uniformity of the paint film under the condition of determining qualification, determining the cause of non - qualification according to the defect type and reducing the pressurizing rate or curing rate under the condition of determining non - qualification, under the condition of secondary determination of non - qualification, comprehensively determining the pressure during the impregnation process according to the pore diameter of the insulating parts and the viscosity of the insulating paint, or, determining the cause of non - qualification of impregnation according to the location of non - uniformity and adjusting the viscosity of the insulating paint.

[0007] Further, the surface defect characterization value is jointly determined by the crack length and the bubble area existing on the surface of the cured insulating parts.

[0008] Further, the control module determines the qualification of impregnation according to the surface defect characterization value of the cured insulating parts. Among them, if the surface defect characterization value is less than the preset defect characterization value, it is determined that the impregnation is qualified, and a secondary determination of the qualification of impregnation is performed according to the evaluation values of the impregnation integrity and uniformity of the paint film; If the surface defect characterization value is greater than or equal to the preset defect characterization value, it is determined that the impregnation is unqualified, and the cause of unqualified impregnation is determined according to the existing defect type.

[0009] Further, based on the condition that the impregnation integrity is less than the preset integrity, it is determined that the impregnation is unqualified in the secondary determination, and the pressure during the impregnation process is comprehensively determined according to the pore diameter of the insulating parts and the viscosity of the insulating paint; Based on the condition that the impregnation integrity is greater than or equal to the preset integrity, the qualification of impregnation is determined in the secondary determination according to the uniformity evaluation value.

[0010] Further, the pressure during the impregnation process is comprehensively determined according to the pore diameter of the insulating parts and the viscosity of the insulating paint. Among them, if the pore diameter of the insulating parts is less than the preset pore diameter and the viscosity of the insulating paint is less than the preset viscosity, the pressure during the impregnation process is determined to be the first pressure; If the pore diameter of the insulating parts is less than the preset pore diameter and the viscosity of the insulating paint is greater than or equal to the preset viscosity, the pressure during the impregnation process is determined to be the second pressure; If the aperture of the insulating part is greater than or equal to the preset aperture and the viscosity of the insulating varnish is less than the preset viscosity, then determine that the pressure during impregnation is the third pressure; If the aperture of the insulating part is greater than or equal to the preset aperture and the viscosity of the insulating varnish is greater than or equal to the preset viscosity, then determine that the pressure during impregnation is the fourth pressure.

[0011] Further, if the uniformity evaluation value is less than the preset evaluation value, then re-determine that the impregnation is unqualified, and determine the reason for the unqualified impregnation according to the location of the non-uniformity; If the uniformity evaluation value is greater than or equal to the preset evaluation value, then re-determine that the impregnation is qualified, and perform a performance test on the insulating part.

[0012] Further, the uniformity evaluation value is jointly determined by the color dispersion degree and the gloss uniformity.

[0013] Further, determine the reason for the unqualified impregnation according to the type of defect existing in the insulating part. Among them, if the defect type is bubbles, then determine that the reason for the unqualified impregnation is that the pressurization rate is too fast, and reduce the pressurization rate according to the actual bubble area ratio. Among them, the pressurization rate is negatively correlated with the actual bubble area ratio; If the defect type is cracks, then determine that the reason for the unqualified impregnation is that the curing rate is too fast, and reduce the curing rate according to the crack characterization value determined by the number and length of the cracks. Among them, the curing rate is negatively correlated with the crack characterization value.

[0014] Further, determine the reason for the unqualified impregnation according to the location of the non-uniform impregnation of the insulating part. Among them, if there is non-uniform impregnation at the edge of the insulating part, then determine that the reason for the unqualified impregnation is that the viscosity of the insulating varnish is too low, and increase the viscosity of the insulating varnish according to the dripping rate of the insulating varnish within a preset time during draining; If there is non-uniformity on the top surface during draining, then determine that the reason for the unqualified impregnation is that the viscosity of the insulating varnish is too high, and reduce the viscosity of the insulating varnish according to the area ratio of the non-uniformity.

[0015] Further, 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.

[0016] Compared with the prior art, the beneficial effect of the present invention is that the present invention jointly determines the surface defect characterization value through the crack length and bubble area existing on the surface of the cured insulating part, and determines the qualification of impregnation according to the surface defect characterization value of the cured insulating part. Re-determination is performed under qualified conditions, and the reason for unqualified is determined under unqualified conditions, improving the detection efficiency through hierarchical determination.

[0017] Furthermore, the present invention determines the uniformity evaluation value through color dispersion and gloss uniformity, and makes a secondary determination of the qualification of impregnation based on the impregnation integrity and uniformity evaluation value of the paint film. When it is unqualified, the pressure during impregnation is comprehensively determined according to the aperture of the insulating part and the viscosity of the insulating paint. By means of double determination, the accuracy of detection is improved. By comprehensively considering these two factors to determine the impregnation pressure, the process parameters can be adjusted more precisely, enabling the insulating paint to better penetrate into the pores of the insulating part and improving the impregnation quality.

[0018] Furthermore, the present invention determines the reasons for impregnation unqualified according to the types of defects existing in the insulating part, and accordingly reduces the pressurization rate or curing rate. By setting an intelligent adjustment method, the problems occurring during impregnation can be targeted to be solved, and the impregnation effect can be optimized.

[0019] Furthermore, the present invention determines the reasons for unqualified according to the location where the impregnation is uneven, and accordingly adjusts the viscosity of the insulating paint, which can specifically solve the problem of uneven impregnation and further optimize the impregnation effect. By setting several adjustment methods for the viscosity of the insulating paint, the viscosity of the insulating paint can be flexibly adjusted, ensuring the stability and reliability of the impregnation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of module connection of the vacuum pressure impregnation system applicable to the insulating parts of high-voltage electrical equipment in an embodiment of the present invention; Figure 2 It is a flowchart for determining the qualification of impregnation according to the surface defect characterization value of the cured insulating part in an embodiment of the present invention; Figure 3 It is a flowchart for making a secondary determination of the qualification of impregnation according to the impregnation integrity and uniformity evaluation value of the paint film in an embodiment of the present invention; Figure 4 It is a flowchart for determining the reasons for impregnation unqualified according to the existing types of defects in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to make the purpose and advantages of the present invention clearer, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and do not limit the protection scope of the present invention.

[0023] It should be noted that the data in this embodiment are all obtained through comprehensive analysis and evaluation of the historical detection data and corresponding historical detection results of the present invention in the three months before this detection. Those skilled in the art can understand that the determination method of the above single parameter in the present invention can be to select the value with the highest proportion according to the data distribution as the preset standard parameter, use weighted summation to obtain the value as the preset standard parameter, substitute each historical data into a specific formula and use the value obtained by the formula as the preset standard parameter, or other selection methods, as long as it satisfies that the present invention can clearly define different specific situations in the single-item determination process through the obtained values.

[0024] Please refer to Figures 1 to 4 as shown, which are respectively the schematic diagram of module connection of the vacuum pressure impregnation system applicable to the insulation parts of high-voltage electrical equipment in the embodiment of the present invention; the flowchart for determining the qualification of impregnation according to the surface defect characterization value of the cured insulation parts; the flowchart for secondary determination of the qualification of impregnation according to the evaluation values of the impregnation integrity and uniformity of the paint film; the flowchart for determining the reason for unqualified impregnation according to the existing defect types.

[0025] The embodiment of the present invention is applicable to a vacuum pressure impregnation system for insulation parts of high-voltage electrical equipment, including: An impregnation module, which is used to impregnate the insulation parts, including an impregnation tank for placing the insulation parts and a liquid level measurement unit arranged inside the impregnation tank; A vacuum module, which is connected to the impregnation module, including a vacuum pump for evacuating the impregnation tank and a vacuum degree monitoring unit for monitoring the internal vacuum degree of the impregnation tank; A pressurization module, which is connected to the impregnation module, including a pressurization unit for pressurizing the impregnation tank and a pressure monitoring unit arranged inside the impregnation tank; A curing module, which is connected to the impregnation module and is used for draining the paint and drying the impregnated insulation parts; A detection module, which is connected to the curing module, including an image recognition unit and a performance detection unit for performing appearance detection and performance detection on the cured insulation parts; A control module, which is respectively connected to the pressurization module, the curing module and the detection module, and is used to determine the qualification of impregnation according to the surface defect characterization value of the cured insulation parts, perform secondary determination on the qualification of impregnation according to the evaluation values of the impregnation integrity and uniformity of the paint film under the condition of qualified determination, determine the reason for unqualified under the condition of unqualified determination according to the defect type and reduce the pressurization rate or curing rate, and under the condition of unqualified secondary determination, comprehensively determine the pressure during the impregnation process according to the pore diameter of the insulation part and the viscosity of the insulating paint, or determine the reason for unqualified impregnation according to the position of non-uniformity and adjust the viscosity of the insulating paint.

[0026] Specifically, the liquid level measurement unit is, for example, an ultrasonic liquid level gauge, a radar liquid level gauge, etc., and 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 impregnation tank to observe the immersion of the insulating paint on the insulating part.

[0027] Specifically, the vacuum degree monitoring unit is, for example, a thermocouple vacuum gauge, an ionization vacuum gauge, etc., and is not specifically limited, as long as it can control the vacuum degree within 0.095 - 0.099 MPa.

[0028] Specifically, the pressurizing unit is a gas compressor, and the pressure monitoring unit is a pressure sensor.

[0029] Specifically, the curing module dries the insulating part after applying the insulating paint through an infrared drying furnace.

[0030] Specifically, the image recognition unit includes an industrial camera for obtaining defects such as cracks and bubbles on the surface of the insulating part, the impregnation integrity and color dispersion, an optical microprobe for observing the impregnation integrity inside the holes, and a gloss meter for obtaining the gloss uniformity.

[0031] Specifically, the performance detection unit includes, but is not limited to, an insulation resistance tester, a dielectric strength tester, etc., for detecting the insulation resistance of the insulating part, evaluating its insulation performance, detecting the breakdown voltage of the insulating part under the action of an electric field, and judging whether its dielectric strength meets the requirements.

[0032] Specifically, the surface defect characterization value is jointly determined by the crack length and bubble area existing on the surface of the cured insulating part. Surface defect characterization value = crack weight coefficient × total crack length / preset crack length + bubble weight coefficient × bubble area / preset bubble area, where the total crack length is the sum of the lengths of all cracks, the crack weight coefficient is 0.6, the preset crack length is 8 mm, the bubble weight coefficient is 0.4, and the preset bubble area is 10 mm 2 。

[0033] Specifically, the control module determines the qualification of impregnation according to the surface defect characterization value of the cured insulating part. Among them, if the surface defect characterization value is less than the preset defect characterization value of 0.8, it is determined that the impregnation is qualified, and the qualification of impregnation is re - judged according to the evaluation values of the impregnation integrity and uniformity of the paint film; If the surface defect characterization value is greater than or equal to the preset defect characterization value, it is determined that the impregnation is unqualified, and the reason for the unqualified impregnation is determined according to the existing defect types.

[0034] In an embodiment of the present invention, the preset defect characterization value is taken as 0.8, but the above value is not limited thereto, and those skilled in the art can adjust this value according to actual needs.

[0035] Specifically, based on the condition that the impregnation integrity is less than the preset integrity of 98%, it is determined that the impregnation is unqualified for the second time, and the pressure during the impregnation process is comprehensively determined according to the pore diameter of the insulating part and the viscosity of the insulating paint. Based on the condition that the impregnation integrity is greater than or equal to the preset integrity, the qualification of the impregnation is determined for the second time according to the uniformity evaluation value.

[0036] In an embodiment of the present invention, the preset integrity is taken as 98%, but the above value is not limited thereto, and those skilled in the art can adjust this value according to actual needs.

[0037] Specifically, the impregnation integrity is the ratio of the impregnated area to the area to be impregnated of the insulating part.

[0038] Specifically, the pressure during the impregnation process is comprehensively determined according to the pore diameter of the insulating part and the viscosity of the insulating paint. Among them, if the pore diameter of the insulating part is less than the preset pore diameter of 5 mm and the viscosity of the insulating paint is less than the preset viscosity of 300 cP, it is determined that the pressure during the impregnation process is the first pressure of 0.3 MPa. If the pore diameter of the insulating part is less than the preset pore diameter and the viscosity of the insulating paint is greater than or equal to the preset viscosity, it is determined that the pressure during the impregnation process is the second pressure of 0.6 MPa. If the pore diameter of the insulating part is greater than or equal to the preset pore diameter and the viscosity of the insulating paint is less than the preset viscosity, it is determined that the pressure during the impregnation process is the third pressure of 0.2 MPa. If the pore diameter of the insulating part is greater than or equal to the preset pore diameter and the viscosity of the insulating paint is greater than or equal to the preset viscosity, it is determined that the pressure during the impregnation process is the fourth pressure of 0.5 MPa.

[0039] In an embodiment of the present invention, the preset pore diameter is taken as 5 mm, the preset viscosity is taken as 200 cP, the first pressure is taken as 0.3 MPa, the second pressure is taken as 0.6 MPa, the third pressure is taken as 0.2 MPa, and the fourth pressure is taken as 0.5 MPa. However, the above values are not limited thereto, and those skilled in the art can adjust the above values according to actual needs.

[0040] Specifically, if the uniformity evaluation value is less than the preset evaluation value of 0.9, it is determined that the impregnation is unqualified for the second time, and the reason for the unqualified impregnation is determined according to the location of the non-uniformity. If the uniformity evaluation value is greater than or equal to the preset evaluation value, it is determined that the impregnation is qualified for the second time, and the performance test of the insulating part is carried out.

[0041] In the embodiments of the present invention, the preset evaluation value is taken as 0.9, but the above value is not limited thereto, and those skilled in the art can adjust this value according to actual needs.

[0042] Specifically, the uniformity evaluation value is jointly determined by the color dispersion degree and the gloss uniformity, and is calculated by the following formula. , in the formula, is the uniformity evaluation value, is the first weight coefficient, and it is set that = 0.55, is the color dispersion degree, is the color dispersion degree threshold, and it is set that = 3.0, is the second weight coefficient, and it is set that = 0.45, is the gloss uniformity, is the gloss uniformity threshold, and it is set that = 5.

[0043] Specifically, the color dispersion degree is the standard deviation of the color difference on the surface of the insulating part. After collecting several images of the surface of the insulating part by an industrial camera and performing color calibration, it is calculated and obtained by using image analysis software.

[0044] Specifically, the gloss uniformity is the standard deviation of the gloss on the surface of the insulating part. It is measured by using a gloss meter to mark measurement points on the surface of the insulating part according to the grid method and calculated by software. Among them, the grid specifications are not specifically limited and can be determined according to the actual size of the insulating part.

[0045] Specifically, the reason for the unqualified impregnation is determined according to the type of defect existing in the insulating part. Among them, if the defect type is bubbles, it is determined that the reason for the unqualified impregnation is that the pressurization rate is too fast, and the pressurization rate is reduced according to the actual proportion of the bubble area. Among them, the pressurization rate is negatively correlated with the actual proportion of the bubble area. If the defect type is cracks, it is determined that the reason for the unqualified impregnation is that the curing rate is too fast, and the curing rate is reduced according to the crack characterization value determined by the number and length of the cracks. Among them, the curing rate is negatively correlated with the crack characterization value.

[0046] Specifically, during the impregnation process, the resin needs to fully penetrate the internal pores of the insulating part. If the pressurization rate is too fast, the viscous resistance of the resin causes it to be unable to fill the micro-pores in time, and the gas is rapidly 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.

[0047] Specifically, volume shrinkage occurs during resin curing. If the curing rate is too fast, the surface layer cures rapidly 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 lag in interior curing is restricted by the surface layer. When the stress exceeds the tensile strength of the material, microcrack propagation is triggered. Therefore, if the defect type is a crack, it is determined that the reason for the unqualified impregnation is the too-fast curing rate.

[0048] 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 crack length.

[0049] Specifically, the pressurization rate is reduced according to the actual bubble area ratio. Among them, if the actual bubble area ratio is less than the first preset area ratio of 0.5%, the first rate adjustment coefficient of 0.95 is used to reduce the pressurization rate to the corresponding value; If the actual bubble area ratio is greater than or equal to the first preset area ratio and less than the second preset area ratio of 0.8%, the second rate adjustment coefficient of 0.91 is used to reduce the pressurization rate to the corresponding value; If the actual bubble area ratio is greater than or equal to the second preset area ratio, the third rate adjustment coefficient of 0.86 is used to reduce the pressurization rate to the corresponding value.

[0050] In the 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%. However, the above values are not limited to this, and those skilled in the art can adjust the above values according to actual needs.

[0051] Specifically, the initial curing rate is 2 °C / min, and the adjustment range of the curing rate is 0.5 - 2 °C / min.

[0052] Specifically, the reason for the unqualified impregnation is determined according to the location where the impregnation of the insulating part is uneven. Among them, if there is uneven impregnation at the edge of the insulating part, it is determined that the reason for the unqualified impregnation is that the viscosity of the insulating paint is too low, and the viscosity of the insulating paint is increased according to the dripping rate of the insulating paint within the preset time of 1 min during draining; If there is unevenness on the top surface during draining, it is determined that the reason for the unqualified impregnation is that the viscosity of the insulating paint is too high, and the viscosity of the insulating paint is reduced according to the area ratio of the unevenness.

[0053] Specifically, there are several adjustment methods 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 10 mL / min, the first viscosity adjustment coefficient of 1.2 is used to increase the viscosity of the insulating paint to the corresponding value; If the dropping rate is greater than or equal to the first preset rate and less than the second preset rate of 20 mL / min, use the second viscosity adjustment coefficient of 1.5 to increase the viscosity of the insulating paint to the corresponding value; If the dropping rate is greater than or equal to the second preset rate, use the third viscosity adjustment coefficient of 1.8 to increase the viscosity of the insulating paint to the corresponding value.

[0054] In the embodiments of the present invention, the first preset rate is 10 mL / min, and the second preset rate is 20 mL / min. However, the above values are not limited thereto, and those skilled in the art can adjust the above values according to actual needs.

[0055] Specifically, based on the condition that the viscosity of the insulating paint is too high, the viscosity of the insulating paint is negatively correlated with the proportion of the uneven area, and the adjustment range of the viscosity of the insulating paint is 200 - 500 cP.

[0056] The working principle of the vacuum pressure impregnation system for insulating parts of high-voltage electrical equipment applicable to the embodiments of the present invention is as follows: Put the pre-baked and moisture-removed insulating parts into the impregnation tank, evacuate the impregnation tank through the vacuum module. When the vacuum degree is greater than the preset vacuum degree of 0.095 MPa, introduce the insulating paint into the impregnation tank. After the insulating paint submerges the insulating parts and reaches the predetermined liquid level, release the vacuum, and introduce dry compressed gas (nitrogen) into the impregnation tank through the pressurization module to apply pressure to the insulating paint for impregnation treatment. After the impregnation treatment is completed, drain the paint and cure the insulating parts, conduct an appearance inspection on the cured insulating parts, and determine the qualification of the impregnation through the control module. Based on the qualified conditions, conduct performance tests.

[0057] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0058] The above are only the preferred embodiments of the present invention and are not used to limit the present invention; for those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vacuum pressure impregnation system applicable to insulating parts of high-voltage electrical equipment, characterized in that, Comprising: An impregnation module for impregnating an insulating part, including an impregnation tank for placing the insulating part and a liquid level measuring unit arranged inside the impregnation tank; A vacuum module connected to the impregnation module, including a vacuum pump for evacuating the impregnation tank and a vacuum degree monitoring unit for monitoring the vacuum degree inside the impregnation tank; A pressurization module connected to the impregnation module, including a pressurization unit for pressurizing the impregnation tank and a pressure monitoring unit arranged inside the impregnation tank; A curing module connected to the impregnation module for draining paint and drying the impregnated insulating part; A detection module connected to the curing module, including an image recognition unit and a performance detection unit for performing appearance detection and performance detection on the cured insulating part; A control module respectively connected to the pressurization module, the curing module and the detection module, for determining the qualification of impregnation according to the surface defect characterization value of the cured insulating part, performing a secondary determination of the qualification of impregnation according to the impregnation integrity and uniformity evaluation value of the paint film under the condition of determining qualification, and determining the reason for non - qualification according to the defect type under the condition of determining non - qualification, including that the pressurization rate does not meet the standard or the curing rate does not meet the standard. Among them, the surface defect characterization value is jointly determined by the crack length and the bubble area existing on the surface of the cured insulating part.

2. The vacuum pressure impregnation system applicable to the insulating parts of high-voltage electrical equipment according to claim 1, characterized in that, The control module, in response to the secondary determination that the impregnation is unqualified, comprehensively determines the pressure during the impregnation process according to the pore diameter of the insulating part and the viscosity of the insulating paint, or determines the reason for the unqualified impregnation according to the location of non - uniformity and adjusts the viscosity of the insulating paint.

3. The vacuum pressure impregnation system applicable to the insulating parts of high-voltage electrical equipment according to claim 2, characterized in that, The control module determines the qualification of impregnation according to the surface defect characterization value of the cured insulating part. Among them, if the surface defect characterization value is less than the preset defect characterization value, it is determined that the impregnation is qualified, and a secondary determination of the qualification of impregnation is performed according to the impregnation integrity and uniformity evaluation value of the paint film; If the surface defect characterization value is greater than or equal to the preset defect characterization value, it is determined that the impregnation is unqualified, and the reason for the unqualified impregnation is determined according to the existing defect type.

4. The vacuum pressure impregnation system applicable to the insulating parts of high-voltage electrical equipment according to claim 3, characterized in that, Based on the condition that the impregnation integrity is less than the preset integrity, it is determined that the impregnation is unqualified in the secondary determination, and the pressure during the impregnation process is comprehensively determined according to the pore diameter of the insulating part and the viscosity of the insulating paint; Based on the condition that the impregnation integrity is greater than or equal to the preset integrity, the qualification of impregnation is determined in the secondary determination according to the uniformity evaluation value.

5. The vacuum pressure impregnation system applicable to the insulating parts of high-voltage electrical equipment according to claim 4, characterized in that, The pressure during the impregnation process is comprehensively determined according to the pore diameter of the insulating part and the viscosity of the insulating paint. Among them, if the pore diameter of the insulating part is less than the preset pore diameter and the viscosity of the insulating paint is less than the preset viscosity, the pressure during the impregnation process is determined as the first pressure; If the pore diameter of the insulating part is less than the preset pore diameter and the viscosity of the insulating paint is greater than or equal to the preset viscosity, the pressure during the impregnation process is determined as the second pressure; If the pore diameter of the insulating part is greater than or equal to the preset pore diameter and the viscosity of the insulating paint is less than the preset viscosity, the pressure during the impregnation process is determined as the third pressure; If the pore diameter of the insulating part is greater than or equal to the preset pore diameter and the viscosity of the insulating paint is greater than or equal to the preset viscosity, the pressure during the impregnation process is determined as the fourth pressure.

6. The vacuum pressure impregnation system applicable to the insulating parts of high-voltage electrical equipment according to claim 5, wherein, If the uniformity evaluation value is less than the preset evaluation value, the impregnation is determined to be unqualified for the second time, and the reason for the unqualified impregnation is determined according to the location of the non-uniformity. If the uniformity evaluation value is greater than or equal to the preset evaluation value, the impregnation is determined to be qualified for the second time, and the performance of the insulating part is tested.

7. The vacuum pressure impregnation system applicable to the insulating parts of high-voltage electrical equipment according to claim 6, characterized in that, The uniformity evaluation value is jointly determined by the color dispersion and the gloss uniformity.

8. The vacuum pressure impregnation system applicable to the insulating parts of high-voltage electrical equipment according to claim 7, characterized in that, The reason for the unqualified impregnation is determined according to the type of defect existing in the insulating part. Among them, if the defect type is bubbles, it is determined that the reason for the unqualified impregnation is that the pressurization rate is too fast, and the pressurization rate is reduced according to the actual bubble area ratio. The pressurization rate is negatively correlated with the actual bubble area ratio. If the defect type is cracks, it is determined that the reason for the unqualified impregnation is that the curing rate is too fast, and the curing rate is reduced according to the crack characterization value determined by the number and length of the cracks. The curing rate is negatively correlated with the crack characterization value.

9. The vacuum pressure impregnation system applicable to the insulating parts of high-voltage electrical equipment according to claim 8, wherein, The reason for the unqualified impregnation is determined according to the location of the non-uniform impregnation of the insulating part. Among them, if there is non-uniform impregnation at the edge of the insulating part, it is determined that the reason for the unqualified impregnation is that the viscosity of the insulating paint is too low, and the viscosity of the insulating paint is increased according to the dripping rate of the insulating paint within a preset time during paint draining. If there is non-uniformity on the top surface during paint draining, it is determined that the reason for the unqualified impregnation is that the viscosity of the insulating paint is too high, and the viscosity of the insulating paint is reduced according to the area ratio of the non-uniformity.

10. The vacuum pressure impregnation system applicable to the insulating parts of high-voltage electrical equipment according to claim 9, characterized in that, There are several adjustment methods for the viscosity of the insulating paint, and each adjustment method has a different adjustment range for the viscosity of the insulating paint.

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