Dry-wet cycle aging device and method

Abstract

The invention provides a dry-wet cycle aging device and method.The dry-wet cycle aging device comprises a box body, a lifting bracket, a high-voltage electrode, a heating module and an aging liquid module, the lifting bracket is arranged in the box body, and the high-voltage electrode is connected to the top of the box body and vertically corresponds to the lifting bracket; the lifting bracket is used for bearing a sample and driving the sample to move upwards to be in contact with the high-voltage electrode so as to detect the dielectric loss factor of the sample, the aging liquid module is communicated with the box body, and the heating module is arranged in the box body. According to the dry-wet cycle aging device provided by the invention, the heating module is used for heating the gas or the aging liquid in the box body, so that the aging liquid or the gas is kept at a stable temperature value, the effective simulation of the dry-wet cycle aging process is realized, and a sample is driven to move upwards through the lifting bracket after a certain number of aging cycles are completed; therefore, the sample abuts against the high-voltage electrode, effective detection of the dielectric loss factor of the sample is realized, the detection convenience is improved, and the accuracy of detection data is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of dry-wet cycle aging detection, and more specifically, relates to a dry-wet cycle aging device and method. Background Art

[0002] In the construction of UHV projects, composite insulators play a vital role in the construction of overhead transmission lines and high-voltage transmission lines. They have excellent anti-pollution flashover capability, outstanding mechanical strength, lightweight materials and convenient installation characteristics. The above characteristics have a significant impact on the safe and stable operation of the power system.

[0003] The core rod of the composite insulator is made of organic synthetic materials, and its main component is glass fiber reinforced plastic. Glass fiber reinforced plastic is subjected to the influence of complex operating environment conditions for a long time, which can easily cause the composite insulator core rod to have deterioration defects. The above defects often cause serious power grid accidents, such as insulator breakage, wire drop, short circuit tripping, etc. Therefore, the deterioration defects of the composite insulator core rod seriously endanger the safe and stable operation of the power grid.

[0004] After the composite insulator sheath is damaged, it is greatly affected by weather factors. The core rod in the damaged area cycles between dry and wet states for a long time, which aggravates the aging process of the core rod. Therefore, it is necessary to perform aging detection on the composite insulator core rod.

[0005] Existing aging methods mainly include traditional aging methods such as high and low temperature cycle aging, wet heat aging, salt spray aging, etc. Most of the devices used in the above methods are cumbersome to operate, and the test conditions are harsh. There are problems with long aging cycles and aging degree determination. It is impossible to accurately judge the aging condition of the sample, and it is difficult to ensure the accuracy of the test. Summary of the invention

[0006] The object of the present invention is to provide a dry-wet cycle aging device and method, which can effectively simulate the aging process of a sample, facilitate accurate judgment of the aging condition of the sample, and improve the accuracy of the test.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a dry-wet cycle aging device, including a box body, a lifting bracket, a high-voltage electrode, a heating module and an aging liquid module, the lifting bracket is arranged in the box body, the high-voltage electrode is connected to the top of the box body and corresponds to the lifting bracket up and down, the lifting bracket is used to support the sample and drive the sample to move up to contact with the high-voltage electrode to detect the dielectric loss factor of the sample, the aging liquid module is connected to the box body, and is used to supply aging liquid into the box body so that the sample is immersed in the aging liquid or is used to receive the aging liquid discharged from the box body, and the heating module is arranged in the box body, and is used to increase the temperature in the box body to dry the sample.

[0008] In a possible implementation, the dry-wet cycle aging device further includes a detection module, the detection module includes a first protective electrode, a second protective electrode and an unprotected electrode, the first protective electrode and the second protective electrode are both slidably connected to the bottom of the high-voltage electrode along the up-down direction, and the first protective electrode and the second protective electrode can be synchronously moved upward to be retracted into the high-voltage electrode, and can also be synchronously moved downward to protrude downward from the high-voltage electrode;

[0009] The unprotected electrode is slidably connected to the top of the lifting bracket along the up and down directions. The unprotected electrode can move up to protrude from the lifting bracket, and can also move down and retract into the lifting bracket. The unprotected electrode can cooperate with the first protective electrode and the second protective electrode to detect the volume resistivity of the sample.

[0010] In one possible implementation, the first protective electrode is cylindrical, the second protective electrode is a cylindrical ring, the second protective electrode is sleeved on the outer circumference of the first protective electrode and is spaced apart from the first protective electrode, the unprotected electrode is cylindrical, and the outer diameter of the unprotected electrode is consistent with the outer diameter of the second protective electrode.

[0011] In one possible implementation, a first sliding cavity is provided in the high-voltage electrode, and an upper driving assembly is provided in the high-voltage electrode for driving the first protective electrode and the second protective electrode to move up and down. The upper driving assembly includes a first conical seat, two first wedge blocks, two first telescopic members and a first elastic member. The first conical seat is connected to the top of the first protective electrode and the second protective electrode. The first elastic member is embedded in the inner top wall of the first sliding cavity and is connected to the first conical seat, and is used to elastically pull the first conical seat upward to retract the first protective electrode and the second protective electrode into the first sliding cavity. The two first wedge blocks are symmetrically arranged on both sides of the first conical seat, and can slide with the first conical seat under the horizontal drive of the first telescopic member to push the first protective electrode and the second protective electrode downward until they protrude downward from the high-voltage electrode.

[0012] In some embodiments, a second sliding cavity is provided in the lifting bracket, and a lower driving assembly for driving the unprotected electrode to move up and down is provided in the lifting bracket, the lower driving assembly includes a second conical seat, two second wedge blocks, two second telescopic members and a second elastic member, the second conical seat is connected to the lower part of the unprotected electrode, the second elastic member is embedded in the inner bottom wall of the second sliding cavity and is connected to the second conical seat, and is used to elastically pull the second conical seat downward to retract the unprotected electrode into the second sliding cavity, the two second wedge blocks are symmetrically arranged on both sides of the second conical seat, and can slide with the second conical seat under the horizontal drive of the second telescopic member to push the unprotected electrode upward until it protrudes upward from the lifting bracket.

[0013] In a possible implementation, the dry-wet cycle aging device also includes a controller and a temperature sensor, a pH value measuring probe, and a conductivity measuring probe electrically connected to the controller, respectively. The temperature sensor is used to detect the temperature inside the box and generate temperature parameters and send them to the controller. The pH value measuring probe is used to detect the pH value of the aging liquid and generate pH value parameters and send them to the controller. The conductivity measuring probe is used to detect the conductivity of the aging liquid and generate conductivity parameters and send them to the controller.

[0014] In some embodiments, a transparent observation window and a display screen located on the side of the transparent observation window are provided on the side wall of the box body, and the display screen is electrically connected to the controller for displaying temperature parameters, pH parameters or conductivity parameters.

[0015] Compared with the prior art, the solution shown in the embodiment of the present application utilizes a heating module to heat the gas or aging liquid in the box to keep the aging liquid or gas at a stable temperature, thereby achieving effective simulation of the dry-wet cycle aging process. After completing a certain number of aging cycles, the sample is driven upward by a lifting bracket to make the sample abut against the high-voltage electrode, thereby achieving effective detection of the sample's dielectric loss factor, improving the convenience of detection, and ensuring the accuracy of the detection data.

[0016] The present invention also provides a dry-wet cycle aging method, comprising the following steps:

[0017] S100: Cut the fiberglass core of the composite insulator to make a sample. The upper and lower surfaces of the sample should be perpendicular to the direction of the glass fiber. The sample is a cylinder with a diameter of 22mm and a height of 2mm. Soak the sample in deionized water for 3-5 days, wipe off the impurities on the surface of the sample, place the sample in an oven to dry for 1 day, and then place the sample flat on the lifting bracket;

[0018] S200: adding aging liquid into the box body by using the aging liquid module, so that the aging liquid always covers the upper surface of the sample. After 24 hours, the aging liquid module extracts the aging liquid from the box body, and uses the heating module to heat the sample for 24 hours. The above process forms an aging cycle;

[0019] The temperature of the aging liquid or gas in the box is always maintained at 80°C. The aging liquid is one of deionized water, a sodium chloride solution with a conductivity of 2200μS / cm-2700μS / cm, a nitric acid solution with a concentration of 0.08mol / L-0.12mol / L, and a sodium hydroxide solution with a concentration of 0.08mol / L-0.12mol / L.

[0020] S300: looping step S200, after completing 24, 48 and 72 aging cycles respectively, using a lifting bracket to move the sample upward to abut against the high-voltage electrode to measure the dielectric loss factor of the sample.

[0021] In a possible implementation, after step S300, step S400 is further included:

[0022] The lifting bracket drives the sample downward, the first protective electrode and the first protected electrode extend from the bottom of the high-voltage electrode, and the unprotected electrode extends from the top of the lifting bracket, so that the top surface of the sample abuts against the bottom surfaces of the first protective electrode and the second protective electrode, and at the same time, the bottom surface of the sample abuts against the top surface of the unprotected electrode. The volume resistivity of the sample is measured, and then the sample is taken out and sealed for storage.

[0023] In a possible implementation, after step S400, step S500 is further included:

[0024] Steps S100 to S400 were performed on three samples using deionized water, a sodium chloride solution with a conductivity of 2200μS / cm-2700μS / cm, a nitric acid solution with a concentration of 0.08mol / L-0.12mol / L, and a sodium hydroxide solution with a concentration of 0.08mol / L-0.12mol / L, respectively, to obtain four groups of aging test data, and the aging degrees of the four groups of samples were compared and analyzed.

[0025] Compared with the prior art, the solution shown in the embodiment of the present application can realize the effective simulation of the dry-wet cycle aging process. After completing a certain number of aging cycles, the sample is driven upward by the lifting bracket to make the sample abut against the high-voltage electrode, thereby realizing effective detection of the sample's dielectric loss factor, improving the convenience of detection, and ensuring the accuracy of the detection data. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 A schematic diagram of the structure of a dry-wet cycle aging device provided in an embodiment of the present invention from a front view;

[0028] Figure 2 A schematic diagram of a partial cross-sectional structure of a dry-wet cycle aging device provided in an embodiment of the present invention;

[0029] Figure 3 For the embodiment of the present invention Figure 2 A schematic diagram of the main cross-sectional structure of the medium and high voltage electrodes, the upper drive assembly, the first protection electrode and the second protection electrode;

[0030] Figure 4 For the embodiment of the present invention Figure 3 A schematic diagram of the front cross-sectional structure of the medium and high voltage electrodes, the upper driving assembly, the first protection electrode and the second protection electrode in another state;

[0031] Figure 5 For the embodiment of the present invention Figure 2 A schematic diagram of the main cross-sectional structure of the middle lifting bracket, the lower drive assembly and the unprotected electrode;

[0032] Figure 6 For the embodiment of the present invention Figure 5 A schematic diagram of the structure of the middle lifting bracket, the lower driving assembly and another state of the unprotected electrode;

[0033] Figure 7 For the embodiment of the present invention Figure 2 A schematic diagram of the main cross-sectional structure of the sample, the first protective electrode, the second protective electrode and the unprotected electrode;

[0034] Figure 8 For the embodiment of the present invention Figure 7 A schematic diagram of a top view structure;

[0035] Fig. 9 For the embodiment of the present invention Figure 7 Schematic diagram of the structure viewed from above.

[0036] Among them, the reference numerals in the figure are:

[0037] 1. Box body; 11. Transparent observation window; 12. Case cover; 13. Handle; 14. Temperature sensor; 15. pH value measuring probe; 16. Conductivity measuring probe; 17. Display screen; 18. Rogowski coil; 2. Lifting bracket; 21. Second sliding cavity; 3. High-voltage electrode; 31. First sliding cavity; 4. Heating module; 5. Aging liquid module; 61. First protective electrode; 62. Second protective electrode; 63. Unprotected electrode; 7. Upper drive assembly; 71. First conical seat; 72. First wedge block; 73. First telescopic member; 74. First elastic member; 8. Lower drive assembly; 81. Second conical seat; 82. Second wedge block; 83. Second telescopic member; 84. Second elastic member; 9. Sample. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on another element or indirectly on another element. It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0040] Please also read Figures 1 to 9 , the dry-wet cycle aging device and method provided by the present invention are now described. The dry-wet cycle aging device includes a box body 1, a lifting bracket 2, a high-voltage electrode 3, a heating module 4 and an aging liquid module 5. The lifting bracket 2 is arranged in the box body 1, the high-voltage electrode 3 is connected to the top of the box body 1 and corresponds to the lifting bracket 2 up and down. The lifting bracket 2 is used to support the sample 9 and drive the sample 9 to move up to contact with the high-voltage electrode 3 to detect the dielectric loss factor of the sample 9. The aging liquid module 5 is connected to the box body 1 and is used to supply the aging liquid into the box body 1 so that the sample 9 is immersed in the aging liquid or is used to receive the aging liquid discharged from the box body 1. The heating module 4 is arranged in the box body 1 and is used to increase the temperature in the box body 1 to dry the sample 9.

[0041] Compared with the prior art, the dry-wet cycle aging device provided in this embodiment uses a heating module 4 to heat the gas or aging liquid in the box 1 to keep the aging liquid or gas at a stable temperature value, thereby achieving effective simulation of the dry-wet cycle aging process. After completing a certain number of aging cycles, the lifting bracket 2 drives the sample 9 to move upward so that the sample 9 is in contact with the high-voltage electrode 3, thereby achieving effective detection of the dielectric loss factor of the sample 9, improving the convenience of detection, and ensuring the accuracy of the detection data.

[0042] In this embodiment, a dry-wet cycle mode combining a water bath and drying is formed in the box 1 by combining the heating module 4 and the aging liquid module 5, and the sample 9 is aged by the corrosive effect of the aging liquid. The water bath formation makes it easier for the sample 9 to better simulate the dry-wet cycle aging condition of the sample 9, thereby improving the accuracy of the detection of the sample 9.

[0043] Specifically, different aging environments can be formed by using aging liquids of different properties such as acid, alkali, and salt. The box 1, the lifting bracket 2, and the high-voltage electrode 3 are all made of corrosion-resistant materials by immersion in the aging liquid. The dielectric loss factor of the sample 9 is measured by the high-voltage electrode 3, and the aging degree of the sample 9 is characterized, which is convenient for effectively evaluating the aging degree of the insulator core rod.

[0044] The aging liquid module 5 delivers the aging liquid in the aging liquid storage tank into the box body 1 through a water pump, and extracts the aging liquid in the box body 1 into the aging liquid storage tank through a water pump, so as to achieve water bath treatment of the sample 9 by the aging liquid, and realize alternation of the water bath and drying process.

[0045] In one possible implementation, see Figures 1 to 9 The dry-wet cycle aging device also includes a detection module, which includes a first protective electrode 61, a second protective electrode 62 and an unprotected electrode 63. The first protective electrode 61 and the second protective electrode 62 are both slidably connected to the bottom of the high-voltage electrode 3 in the up-down direction. The first protective electrode 61 and the second protective electrode 62 can be synchronously moved upward to be retracted in the high-voltage electrode 3, and can also be synchronously moved downward to protrude downward from the high-voltage electrode 3;

[0046] The unprotected electrode 63 is connected to the top of the lifting bracket 2 by sliding in the up and down directions. The unprotected electrode 63 can move upward to protrude from the lifting bracket 2, and can also move downward and retract into the lifting bracket 2. The unprotected electrode 63 can cooperate with the first protective electrode 61 and the second protective electrode 62 to detect the volume resistivity of the sample 9.

[0047] In this embodiment, the detection module can effectively detect the volume resistivity of the sample 9 by cooperating with the first protective electrode 61, the second protective electrode 62 and the unprotected electrode 63. The first protective electrode 61 and the second protective electrode 62 are arranged on the high-voltage electrode 3, and can be retracted upward into the high-voltage electrode 3 or extended downward to the bottom surface protruding from the high-voltage electrode 3 according to the detection requirements. When volume resistivity detection is required, the first protective electrode 61 and the second protective electrode 62 protrude downward from the bottom surface of the high-voltage electrode 3, and at the same time, the unprotected electrode 63 moves up and protrudes from the top surface of the lifting bracket 2, and the first protective electrode 61 and the second protective electrode 62 are used to press against the top of the sample 9, and the unprotected electrode 63 is used to support the bottom of the sample 9, so as to directly and accurately detect the volume resistivity and leakage current of the sample 9.

[0048] The configuration of the above detection module realizes the inspection of the volume resistivity of the sample 9 without affecting the dielectric loss factor detection of the sample 9 by the high voltage electrode 3, realizes the multi-parameter detection of the sample 9, and ensures the detection accuracy of the sample 9.

[0049] In some embodiments, the first protective electrode 61 is cylindrical, the second protective electrode 62 is a cylindrical ring, the second protective electrode 62 is sleeved on the outer circumference of the first protective electrode 61 and is spaced apart from the first protective electrode 61, and the unprotected electrode 63 is cylindrical, and the outer diameter of the unprotected electrode 63 is consistent with the outer diameter of the second protective electrode 62.

[0050] In this embodiment, the second protective electrode 62 is sleeved on the periphery of the first protective electrode 61, and a certain distance is spaced between the two, and the two can be in contact with the top surface of the sample 9 synchronously. The unprotected electrode 63 arranged on the lifting bracket 2 is consistent with the outer diameter of the second protective electrode 62, forming an upper and lower corresponding relationship above and below the sample 9. The upper driving component 7 can be used to drive the first protective electrode 61 and the second protective electrode 62 downward, and the lower driving component 8 can be used to drive the unprotected electrode 63 downward, so that the top surface of the sample 9 is in contact with the first protective electrode 61 and the second protective electrode 62, and the bottom surface of the sample 9 is in contact with the unprotected electrode 63, so as to achieve effective inspection of the volume resistivity of the sample 9.

[0051] In one possible implementation, see Figures 1 to 9 A first sliding cavity 31 is provided in the high-voltage electrode 3, and an upper driving assembly 7 is provided in the high-voltage electrode 3 for driving the first protective electrode 61 and the second protective electrode 62 to move up and down. The upper driving assembly 7 includes a first conical seat 71, two first wedge blocks 72, two first telescopic members 73 and a first elastic member 74. The first conical seat 71 is connected to the top of the first protective electrode 61 and the second protective electrode 62. The first elastic member 74 is embedded in the inner top wall of the first sliding cavity 31 and is connected to the first conical seat 71, and is used to elastically pull the first conical seat 71 upward to retract the first protective electrode 61 and the second protective electrode 62 into the first sliding cavity 31. The two first wedge blocks 72 are symmetrically arranged on both sides of the first conical seat 71, and can slide with the first conical seat 71 under the horizontal drive of the first telescopic member 73 to push the first protective electrode 61 and the second protective electrode 62 downward to protrude downward from the high-voltage electrode 3.

[0052] In this embodiment, the driving of the first protective electrode 61 and the second protective electrode 62 by the above driving component 7 is taken as an example to illustrate. The first sliding cavity 31 in the high-voltage electrode 3 can allow the first protective electrode 61 and the second protective electrode 62 to slide up and down synchronously. The first conical seat 71 set on the top of the first protective electrode 61 and the second protective electrode 62 can connect the first protective electrode 61 and the second protective electrode 62 as a whole, and the two can move up and down synchronously. The top of the first sliding cavity 31 matches the size of the first conical seat 71, and the first elastic member 74 is connected to the top of the first conical seat 71, which can provide an upward elastic pulling force to the first conical seat 71. In order to avoid electrical conduction between the two and affect the subsequent detection process, the first conical seat 71 is made of insulating material.

[0053] The first telescopic member 73 can push the first wedge block 72 horizontally, and the first conical seat 71, the first protective electrode 61 and the second protective electrode 62 can be lowered by the sliding cooperation between the first wedge block 72 and the first conical seat 71. At this time, the first elastic member 74 is stretched to cooperate with the downward movement of the first conical seat 71, the first protective electrode 61 and the second protective electrode 62.

[0054] When the volume resistivity test of the sample 9 is completed, the first telescopic member 73 retracts to drive the first wedge block 72 to move horizontally outward. During this process, the first elastic member 74 can drive the first conical seat 71, the first protective electrode 61 and the second protective electrode 62 to move upward synchronously and retract into the high-voltage electrode 3.

[0055] For some examples, see Figures 1 to 9 , a second sliding cavity 21 is provided in the lifting bracket 2, and a lower driving assembly 8 is provided in the lifting bracket 2 for driving the unprotected electrode 63 to move up and down. The lower driving assembly 8 includes a second conical seat 81, two second wedge blocks 82, two second telescopic members 83 and a second elastic member 84. The second conical seat 81 is connected to the bottom of the unprotected electrode 63. The second elastic member 84 is embedded on the inner bottom wall of the second sliding cavity 21 and connected to the second conical seat 81, and is used to elastically pull the second conical seat 81 downward to retract the unprotected electrode 63 into the second sliding cavity 21. The two second wedge blocks 82 are symmetrically arranged on both sides of the second conical seat 81, and can slide and cooperate with the second conical seat 81 under the horizontal drive of the second telescopic member 83 to push the unprotected electrode 63 upward to protrude upward from the lifting bracket 2. The process of the lower driving assembly 8 driving the unprotected electrode 63 to move up and down is similar to the driving principle of the upper driving assembly 7, which will not be repeated here.

[0056] In one possible implementation, see Figures 1 to 9The dry-wet cycle aging device also includes a controller and a temperature sensor 14, a pH value measuring probe 15 and a conductivity measuring probe 16 which are electrically connected to the controller respectively. The temperature sensor 14 is used to detect the temperature in the box 1 and generate a temperature parameter to send to the controller. The pH value measuring probe 15 is used to detect the pH value of the aging liquid and generate a pH value parameter to send to the controller. The conductivity measuring probe 16 is used to detect the conductivity of the aging liquid and generate a conductivity parameter to send to the controller.

[0057] In this embodiment, a temperature sensor 14, a pH value measuring probe 15 and a conductivity measuring probe 16 are also provided in the box 1. The above components can be used to accurately detect the temperature in the box 1 and the pH value and conductivity of the aging liquid in real time, and transmit the above parameters to the controller in real time. The temperature in the box 1 includes both the temperature of the gas in the box 1 in different dry and wet states and the temperature of the aging liquid in the box 1.

[0058] For some examples, see Figures 1 to 9 A transparent observation window 11 and a display screen 17 located on the side of the transparent observation window 11 are provided on the side wall of the box body 1. The display screen 17 is electrically connected to the controller for displaying temperature parameters, pH parameters or conductivity parameters.

[0059] In this embodiment, the transparent observation window 11 provided on the side wall of the box 1 is convenient for the experimenter to observe and operate, and the display screen 17 is used to display the real-time temperature, pH value, conductivity and other corresponding parameters in the box 1, so that the operator can record them conveniently.

[0060] At the same time, a vent hole is provided on the top wall of the box body 1, a case cover 12 is provided on the top of the box body 1, and a handle 13 is provided on the case cover 12 to facilitate opening of the box body 1 and placement of the sample 72. The high-voltage electrode 3 is connected to the top wall of the box body 1 or below the case cover 12 through a connecting rod, and a Rogowski coil 18 is sleeved on the connecting rod.

[0061] The function of the Rogowski coil 18 is to measure alternating current, and is particularly suitable for measuring alternating current within a wider frequency range. It is an alternating current sensor that realizes electric energy measurement through the principle of electromagnetic induction and can effectively detect the leakage current of the sample 9.

[0062] Based on the same inventive concept, the embodiment of the present application also provides a dry-wet cycle aging method, comprising the following steps:

[0063] S100: Cut the composite insulator glass fiber reinforced plastic core to make sample 9. The upper and lower surfaces of sample 9 should be perpendicular to the direction of glass fiber. Sample 9 is a cylinder with a diameter of 22 mm and a height of 2 mm. Soak the sample in deionized water for 3-5 days, wipe off the impurities on the surface of sample 9, place sample 9 in an oven for 1 day, and then place sample 9 flat on the lifting bracket 2;

[0064] S200: adding aging liquid into the box 1 by using the aging liquid module 5, so that the aging liquid always covers the upper surface of the sample 9. After 24 hours, the aging liquid module 5 extracts the aging liquid from the box 1, and heats the sample 9 for 24 hours by using the heating module 4. The above process forms an aging cycle;

[0065] The temperature of the aging liquid or gas in the box 1 is always maintained at 80°C, and the aging liquid is one of deionized water, a sodium chloride solution with a conductivity of 2200μS / cm-2700μS / cm, a nitric acid solution with a concentration of 0.08mol / L-0.12mol / L, and a sodium hydroxide solution with a concentration of 0.08mol / L-0.12mol / L;

[0066] S300: looping step S200, after completing 24, 48 and 72 aging cycles respectively, using the lifting bracket 2 to drive the sample 9 to move up to abut against the high-voltage electrode 3 to measure the dielectric loss factor of the sample 9.

[0067] Step S400: The lifting bracket 2 drives the sample 9 to move downward, the first protective electrode 61 and the second protective electrode 62 extend from the bottom of the high-voltage electrode 3, and the unprotected electrode 63 extends from the top of the lifting bracket 2, so that the top surface of the sample 9 abuts against the bottom surfaces of the first protective electrode 61 and the second protective electrode 62, and at the same time, the bottom surface of the sample 9 abuts against the top surface of the unprotected electrode 63, and the volume resistivity of the sample 9 is measured. Then, the sample 9 is taken out and sealed for storage, so as to facilitate other subsequent analysis and testing of the sample 9.

[0068] Step S500: Use deionized water, sodium chloride solution with a conductivity of 2200μS / cm-2700μS / cm, nitric acid solution with a concentration of 0.08mol / L-0.12mol / L, and sodium hydroxide solution with a concentration of 0.08mol / L-0.12mol / L to perform steps S100 to S400 on three samples 9, respectively, to obtain four groups of aging test data, and compare and analyze the aging degree of the four groups of samples 9.

[0069] Embodiment 1:

[0070] When conducting the dry-wet cycle aging test of sample 9, first, prepare sample 9 of the composite insulator fiberglass core rod. Sample 9 is a cylindrical structure with a diameter of 22 cm and a height of 2 cm. The surface of sample 9 is required to be smooth without visible pits or protrusions. The surface roughness Ra is required to be less than 0.1. Subsequently, sample 9 is placed on the lifting bracket 2. It should be noted that the upper and lower surfaces of sample 9 should be perpendicular to the direction of the glass fiber to meet the detection requirements of sample 9.

[0071] After preparation, sample 9 needs to be soaked in deionized water for 3-5 days. After soaking, wipe the surface of sample 9 with a dust-free cloth to keep the cleanliness of sample 9. Then, sample 9 is placed in an oven and dried for one day. Finally, sample 9 for dry-wet cycle aging is obtained, and sample 9 is placed above the lifting bracket 2.

[0072] First, use the aging liquid module 5 to inject aging liquid into the box 1. Deionized water is used as the aging liquid. The aging liquid is made to cover the upper surface of the sample 9. The sample 9 is immersed for 24 hours. The aging liquid is always kept at 80°C using the heating module 4 to ensure that the aging liquid is always submerged in the upper surface of the sample 9 during the aging test.

[0073] Afterwards, the aging liquid module 5 is used to draw the aging liquid out of the box 1, and the heating module 4 is used to heat the sample 9 in the box 1 for 24 hours. The dry-wet cycle duration is set to 24 hours, that is, every 24 hours, the device automatically switches the dry-wet aging state, that is, the aging liquid is poured into the box 1 and kept for 24 hours, and the aging liquid is drawn out from the box 1 and kept for 24 hours. The two steps are alternately performed. At this time, the lifting bracket 2 is in a low position, and the sample 9 is separated from the high-voltage electrode 3.

[0074] After completing 24 aging cycles, the lifting bracket 2 drives the sample 9 to move upward to contact the high-voltage electrode 3 to detect the dielectric loss factor of the sample 9. The set voltage is applied to the high-voltage electrode 3, and the lifting bracket 2 is grounded. Afterwards, the first protective electrode 61 and the second protective electrode 62 extend from the bottom of the high-voltage electrode 3 to contact the top surface of the sample 9, and the unprotected electrode 63 extends from the top of the lifting bracket 2 to contact the bottom surface of the sample 9. The volume resistivity of the sample 9 is measured and the test results are derived. Afterwards, after completing 48 and 72 aging cycles, the dielectric loss factor and volume resistivity of the sample 9 are also tested. The sample 9 is then sealed and stored to facilitate subsequent other analysis and testing of the sample 9.

[0075] The process of using deionized water as the aging liquid was repeated, and the above test was carried out on another three samples 9 using sodium chloride solution with a conductivity of 2500μS / cm, nitric acid solution with a concentration of 0.1mol / L, and sodium hydroxide solution with a concentration of 0.1mol / L as aging liquids, respectively. Another three groups of parameters were measured, and the aging degrees of different groups of samples 9 were compared and analyzed to explore the aging mechanism of the FRP core rod and to compare and analyze the aging degrees of sample 9.

[0076] Compared with the prior art, the solution shown in the embodiment of the present application can realize the effective simulation of the dry-wet cycle aging process. After completing a certain number of aging cycles, the lifting bracket 2 drives the sample 9 to move upward so that the sample 9 is in contact with the high-voltage electrode 3, thereby realizing effective detection of the dielectric loss factor of the sample 9, improving the convenience of detection, and ensuring the accuracy of the detection data.

[0077] The above method eliminates the tedious and complicated manual operations, and can accurately simulate the dry and wet states of the FRP core rod under acid, alkali and salt solutions in actual operation, overcoming the problems of harsh test conditions, long aging cycle and difficulty in determining the degree of aging in existing test methods, thereby improving the measurement accuracy of the test.

[0078] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Dry-wet cycle aging device, characterized in that: It includes a box body, a lifting bracket, a high-voltage electrode, a heating module and an aging liquid module. The lifting bracket is arranged in the box body. The high-voltage electrode is connected to the top of the box body and corresponds to the lifting bracket up and down. The lifting bracket is used to support the sample and drive the sample to move up to contact with the high-voltage electrode to detect the dielectric loss factor of the sample. The aging liquid module is connected to the box body and is used to supply aging liquid into the box body so that the sample is immersed in the aging liquid or is used to receive the aging liquid discharged from the box body. The heating module is arranged in the box body and is used to increase the temperature in the box body to dry the sample.

2. The dry-wet cycle aging device according to claim 1, characterized in that: The dry-wet cycle aging device also includes a detection module, which includes a first protective electrode, a second protective electrode and an unprotected electrode, wherein the first protective electrode and the second protective electrode are both slidably connected to the bottom of the high-voltage electrode in the up-down direction, and the first protective electrode and the second protective electrode can be synchronously moved upward to be retracted into the high-voltage electrode, and can also be synchronously moved downward to protrude downward from the high-voltage electrode; The unprotected electrode is slidably connected to the top of the lifting bracket along the up and down directions. The unprotected electrode can move upward to protrude from the lifting bracket, and can also move downward and retract into the lifting bracket. The unprotected electrode can cooperate with the first protective electrode and the second protective electrode to detect the volume resistivity of the sample.

3. The dry-wet cycle aging device according to claim 2, characterized in that: The first protective electrode is cylindrical, the second protective electrode is a cylindrical ring, the second protective electrode is sleeved on the outer circumference of the first protective electrode and is spaced apart from the first protective electrode, the unprotected electrode is cylindrical, and the outer diameter of the unprotected electrode is consistent with the outer diameter of the second protective electrode.

4. The dry-wet cycle aging device according to claim 2, characterized in that: A first sliding cavity is provided in the high-voltage electrode, and an upper driving component is provided in the high-voltage electrode for driving the first protective electrode and the second protective electrode to move up and down. The upper driving component includes a first conical seat, two first wedge blocks, two first telescopic members and a first elastic member. The first conical seat is connected to the top of the first protective electrode and the second protective electrode. The first elastic member is embedded in the inner top wall of the first sliding cavity and is connected to the first conical seat, and is used to elastically pull the first conical seat upward to retract the first protective electrode and the second protective electrode into the first sliding cavity. The two first wedge blocks are symmetrically arranged on both sides of the first conical seat, and can slide with the first conical seat under the horizontal drive of the first telescopic member to push the first protective electrode and the second protective electrode downward to protrude downward from the high-voltage electrode.

5. The dry-wet cycle aging device according to claim 4, characterized in that: A second sliding cavity is provided in the lifting bracket, and a lower driving assembly for driving the unprotected electrode to move up and down is provided in the lifting bracket. The lower driving assembly includes a second conical seat, two second wedge blocks, two second telescopic members and a second elastic member. The second conical seat is connected to the lower part of the unprotected electrode. The second elastic member is embedded in the inner bottom wall of the second sliding cavity and is connected to the second conical seat, and is used to elastically pull the second conical seat downward to retract the unprotected electrode into the second sliding cavity. The two second wedge blocks are symmetrically arranged on both sides of the second conical seat, and can slide and cooperate with the second conical seat under the horizontal drive of the second telescopic member to push the unprotected electrode upward until it protrudes upward from the lifting bracket.

6. The dry-wet cycle aging device according to claim 1, characterized in that: The dry-wet cycle aging device also includes a controller and a temperature sensor, a pH value measuring probe and a conductivity measuring probe electrically connected to the controller respectively. The temperature sensor is used to detect the temperature inside the box and generate temperature parameters and send them to the controller. The pH value measuring probe is used to detect the pH value of the aging liquid and generate pH value parameters and send them to the controller. The conductivity measuring probe is used to detect the conductivity of the aging liquid and generate conductivity parameters and send them to the controller.

7. The dry-wet cycle aging device according to claim 6, characterized in that: A transparent observation window and a display screen located on the side of the transparent observation window are provided on the side wall of the box body. The display screen is electrically connected to the controller for displaying the temperature parameter, the pH value parameter or the conductivity parameter.

8. A dry-wet cycle aging method using the dry-wet cycle aging device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S100: Cut the fiberglass core of the composite insulator to make a sample. The upper and lower surfaces of the sample should be perpendicular to the direction of the glass fiber. The sample is a cylinder with a diameter of 22mm and a height of 2mm. Soak the sample in deionized water for 3-5 days, wipe off the impurities on the surface of the sample, place the sample in an oven to dry for 1 day, and then place the sample flat on the lifting bracket; S200: adding aging liquid into the box by using the aging liquid module, so that the aging liquid always covers the upper surface of the sample. After 24 hours, the aging liquid module extracts the aging liquid from the box, and heats the sample for 24 hours by using the heating module. The above process forms an aging cycle; The temperature of the aging liquid or gas in the box is always maintained at 80° C. The aging liquid is one of deionized water, a sodium chloride solution with a conductivity of 2200 μS / cm-2700 μS / cm, a nitric acid solution with a concentration of 0.08 mol / L-0.12 mol / L, and a sodium hydroxide solution with a concentration of 0.08 mol / L-0.12 mol / L; S300: looping step S200, after completing 24, 48 and 72 aging cycles respectively, using the lifting bracket to drive the sample to move upward to abut against the high-voltage electrode to measure the dielectric loss factor of the sample.

9. The dry-wet cycle aging method according to claim 8, characterized in that: After step S300, step S400 is also included: The lifting bracket drives the sample to move downward, the first protective electrode and the first protected electrode extend from the bottom of the high-voltage electrode, and the unprotected electrode extends from the top of the lifting bracket, so that the top surface of the sample abuts against the bottom surfaces of the first protective electrode and the second protective electrode, and at the same time, the bottom surface of the sample abuts against the top surface of the unprotected electrode. The volume resistivity of the sample is measured, and then the sample is taken out and sealed for storage.

10. The dry-wet cycle aging method according to claim 8, characterized in that: After step S400, step S500 is also included: Steps S100 to S400 were performed on three samples using deionized water, a sodium chloride solution with a conductivity of 2200μS / cm-2700μS / cm, a nitric acid solution with a concentration of 0.08mol / L-0.12mol / L, and a sodium hydroxide solution with a concentration of 0.08mol / L-0.12mol / L, respectively, to obtain four groups of aging test data, and the aging degrees of the four groups of samples were compared and analyzed.

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