Composite insulator silicone rubber dehumidification method and device based on vacuum thermal cycle

Abstract

The present application provides a dehumidification method and device for composite insulator silicone rubber based on vacuum thermal cycling. The dehumidification device includes an intelligent device, an electric heating controller, a test chamber, a vacuum pump, a weight sensor, a temperature sensor, a vacuum sensor, and a fixture. The dehumidification method includes pre-treating a composite insulator sample to obtain a composite insulator sample to be tested. At each preset vacuum value, test data of the composite insulator sample to be tested is obtained in real time based on the temperature change rate and the temperature cycle change range, wherein the test data includes a first mass, a second mass, and a dehumidification rate determined based on the first mass and the second mass. When the number of cycles is reached, evaluation data is determined based on the test data at each preset vacuum value. The present application achieves rapid and efficient dehumidification of silicone rubber, the material used in composite insulator sheaths, improving the efficiency of dehumidification detection.

Description

Technical Field

[0001] The present application relates to the field of detection and maintenance of power grid accessories, and in particular to a method and device for dehumidifying silicone rubber of composite insulators based on vacuum thermal cycle. Background Art

[0002] Composite insulators, made of high-temperature vulcanized silicone rubber sheds and epoxy resin cores, have become the primary insulators used on UHV lines due to their light weight, high mechanical strength, and excellent pollution flashover resistance. The organic composite materials in composite insulators can age under the influence of internal and external factors, such as shed oxidation, decomposition, corrosion, tracking, discoloration, pulverization, cracking, decreased hydrophobicity or loss of hydrophobic migration, reduced flashover strength, deteriorated mechanical strength, and brittle and decaying fractures.

[0003] At present, the dehumidification method of composite insulator silicone rubber is mainly achieved through the purge gas process method, including using purified gas as purge gas and raw gas as purge gas; when purified gas is used as purge gas for dehumidification, the raw gas is removed from the membrane surface after water vapor is removed, and a part of the purified gas obtained is used as the purge gas for the permeate gas; when raw gas is used as purge gas for dehumidification, a part of the raw gas is used as the purge gas.

[0004] However, using purified gas as purge gas reduces the partial pressure of water vapor on the permeate side and reduces the gas recovery rate; using feed gas as purge gas reduces the water vapor concentration on the permeate side and cannot obtain purified gas with a low dew point, resulting in a low dehumidification rate, a cumbersome process, and low dehumidification detection efficiency. Summary of the Invention

[0005] The present application provides a method and device for dehumidifying silicone rubber of composite insulators based on vacuum thermal cycle to solve the existing technical problems of low dehumidification rate and low dehumidification detection efficiency.

[0006] In order to achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0007] In a first aspect, the present application provides a dehumidification device for composite insulator silicone rubber based on vacuum thermal cycle, comprising an intelligent device, an electric heating controller, a test chamber, a vacuum pump, a weight sensor, a temperature sensor, a vacuum sensor, and a fixture;

[0008] The fixture is arranged inside the test cavity, and is used to fix the composite insulator sample to be tested;

[0009] The electric heating controller is electrically connected to the test cavity, and is used to heat the composite insulator sample to be tested in the test cavity;

[0010] The vacuum pump is connected to the test cavity, and the vacuum pump is used to adjust the vacuum degree in the test cavity;

[0011] The smart device is electrically connected to the weight sensor, the temperature sensor, and the vacuum sensor, and is configured as follows:

[0012] At each preset vacuum degree value, test data of the composite insulator sample to be tested is obtained in real time according to the temperature change rate and the temperature cycle change range, wherein the test data includes a first mass, a second mass, and a dehumidification rate determined according to the first mass and the second mass.

[0013] In combination with the first aspect, in one possible implementation, the weight sensor, the temperature sensor, and the vacuum sensor are provided on the test cavity.

[0014] In combination with the first aspect, in one possible implementation, the dehumidification device further includes a liquid nitrogen container and a liquid nitrogen pump; the liquid nitrogen container and the test cavity are connected via the liquid nitrogen pump.

[0015] In combination with the first aspect, in one implementable manner, the smart device is electrically connected to the liquid nitrogen pump, and the smart device is used to control the liquid nitrogen pump to adjust the nitrogen concentration in the test chamber.

[0016] In combination with the first aspect, in one achievable manner, the dehumidification device further includes a macro controller; the macro controller is connected to the fixture and is used to adjust the position of the composite insulator sample to be tested.

[0017] In combination with the first aspect, in one possible implementation, the clamp is a ring-shaped clamp.

[0018] As can be seen from the above technical solution, the present application provides a dehumidification device for composite insulator silicone rubber based on vacuum thermal cycling, comprising an intelligent device, an electric heating controller, a test chamber, a vacuum pump, a weight sensor, a temperature sensor, a vacuum sensor, and a fixture; the fixture is disposed within the test chamber and is used to fix the composite insulator sample to be tested; the electric heating controller is electrically connected to the test chamber and is used to heat the composite insulator sample to be tested in the test chamber; the vacuum pump is connected to the test chamber and is used to adjust the vacuum level in the test chamber; the intelligent device is electrically connected to the weight sensor, the temperature sensor, and the vacuum sensor, and is configured to: at each preset vacuum level, obtain test data of the composite insulator sample to be tested in real time based on the temperature change rate and temperature cycle change range, wherein the test data includes temperature data, vacuum level, first mass, second mass, and a dehumidification rate determined based on the first mass and second mass. The present application achieves rapid and efficient dehumidification of the silicone rubber material of the composite insulator sheath, improving the efficiency of dehumidification detection.

[0019] In a second aspect, the present application provides a method for dehumidifying composite insulator silicone rubber based on vacuum thermal cycling, comprising the following steps:

[0020] Pre-processing the composite insulator sample to obtain the composite insulator sample to be tested;

[0021] At each preset vacuum degree value, test data of the composite insulator sample to be tested is obtained in real time according to the temperature change rate and the temperature cycle change range, wherein the test data includes a first mass, a second mass, and a dehumidification rate determined based on the first mass and the second mass;

[0022] When the number of cycles is reached, the evaluation data is determined based on the test data at each preset vacuum value;

[0023] The number of cycles is determined according to different preset vacuum values.

[0024] In combination with the second aspect, in one achievable manner, the pretreatment is to remove surface impurities of the composite insulator sample to be tested by using anhydrous ethanol.

[0025] In combination with the second aspect, in one achievable manner, within a temperature cycle variation range, the temperature is cycled according to a preset number of times, wherein the high temperature and the low temperature need to be maintained for a preset time.

[0026] In combination with the second aspect, in one possible implementation, the preset time is greater than a set value.

[0027] As can be seen from the above technical solution, the present application provides a vacuum thermal cycle-based dehumidification method for composite insulator silicone rubber, which includes pre-treating a composite insulator sample to obtain a composite insulator sample to be tested; obtaining test data of the composite insulator sample to be tested in real time based on the temperature change rate and temperature cycle change range at each preset vacuum value, wherein the test data includes a first mass, a second mass, and a dehumidification rate determined based on the first mass and the second mass; when the number of cycles is reached, determining evaluation data based on the test data at each preset vacuum value. The present application achieves rapid and efficient dehumidification of the silicone rubber material used in composite insulator sheaths, improving the efficiency of dehumidification detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0029] Figure 1 This is a schematic structural diagram of a composite insulator silicone rubber dehumidification device based on a vacuum thermal cycle according to an embodiment of the present application;

[0030] Figure 2 This is a flow chart of a method for dehumidifying silicone rubber for composite insulators based on vacuum thermal cycling according to an embodiment of the present application;

[0031] Figure 3 This is a flow chart of a vacuum thermal cycle in a method for dehumidifying silicone rubber of a composite insulator based on a vacuum thermal cycle according to an embodiment of the present application;

[0032] Among them: 1-intelligent device; 2-vacuum sensor; 3-test cavity; 4-ring fixture; 5-macro controller; 6-weight sensor; 7-liquid nitrogen pump; 8-temperature sensor; 9-composite insulator sample to be tested; 10-vacuum pump; 11-electric heating controller; 12-liquid nitrogen container. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] Water absorption and permeability of composite insulator sheath materials are the main reasons for composite insulator fracture and insulator temperature increase. Therefore, the rapid and efficient dehumidification method of composite insulator silicone rubber determines the service life of the composite insulator and the safety and reliability of its operation.

[0036] Current dehumidification methods using purge gas include using purified gas as the purge gas and raw gas as the purge gas. When purified gas is used as the purge gas for dehumidification, the raw gas is dehumidified by removing water vapor from the membrane surface, and a portion of the purified gas is used as the purge gas for the permeate gas. When raw gas is used as the purge gas for dehumidification, a portion of the raw gas is used as the purge gas. Using purified gas as the purge gas reduces the partial pressure of water vapor on the permeate side, reducing the gas recovery rate. Using raw gas as the purge gas reduces the water vapor concentration on the permeate side, making it impossible to obtain purified gas with a low dew point. Raw gas is the raw material that needs to be dehumidified, and purified gas is the gas after water vapor has been removed from the membrane surface.

[0037] In order to solve the problems existing in the existing composite insulator silicone rubber dehumidification method, some embodiments of this application provide a vacuum thermal cycle dehumidification device for dehumidifying the silicone rubber of the composite insulator shed sheath material. Figure 1 As shown, the vacuum thermal cycle dehumidification device includes an intelligent device 1, an electric heating controller 11, a test chamber 3, a vacuum pump 10, a liquid nitrogen container 12, a liquid nitrogen pump 7, a weight sensor 6, a temperature sensor 8, a vacuum sensor 2, a clamp and a macro controller 5.

[0038] The clamp is arranged inside the test cavity 3 and is used to fix the composite insulator sample 9 to be tested; the macro controller 5 is connected to the clamp and is arranged on both sides of the test cavity 3, and is used to fix the composite insulator sample 9 to be tested and maintain it in the middle part of the cavity, and the position of the composite insulator sample 9 to be tested can be adjusted.

[0039] In some embodiments, the clamp is a ring clamp 4 .

[0040] The electric heating controller 11 is electrically connected to the test cavity 3 and is used to heat the composite insulator sample 9 to be tested in the test cavity 3; the temperature sensor 8 on the test cavity 3 is used to detect the cavity temperature data of the test cavity 3 and return it in real time.

[0041] The smart device 1 is electrically connected to the weight sensor 6 , the temperature sensor 8 , and the vacuum sensor 2 . The weight sensor 6 , the temperature sensor 8 , and the vacuum sensor 2 are arranged on the test cavity 3 .

[0042] The temperature sensor 8 on the test chamber 3 is used to detect the temperature data within the test chamber 3. The weight sensors 6 installed on both sides of the composite insulator sample 9 to be tested in the test chamber 3 obtain mass data, including a first mass and a second mass, where the first mass is the mass before the test and the second mass is the mass after the test. The weight sensors 6 also obtain the sample mass (i.e., the initial weight of the new sample). The vacuum level data of the test chamber 3 is obtained by the vacuum sensor 2. The collected temperature data, mass data, and vacuum level data are sent to the smart device 1.

[0043] In some embodiments, the smart device 1 may include a data acquisition unit and a control unit; it may be implemented by an industrial computer with an acquisition card, or by a collector and a PC (ie, a computer).

[0044] The vacuum pump 10 is connected to the test cavity 3 and is used to control the vacuum environment in the test cavity 3;

[0045] The liquid nitrogen pump 7 controls the liquid nitrogen to enter the test cavity 3 by extracting liquid nitrogen; and can also realize a linear temperature reduction process by controlling the on / off of the power supply of the liquid nitrogen pump 7.

[0046] The smart device is configured to:

[0047] At each preset vacuum degree value, test data of the composite insulator sample to be tested is obtained in real time according to the temperature change rate and the temperature cycle change range, wherein the test data includes a first mass, a second mass, and a dehumidification rate determined according to the first mass and the second mass.

[0048] As can be seen from the above technical solution, the present application provides a dehumidification device for composite insulator silicone rubber based on vacuum thermal cycling, comprising an intelligent device, an electric heating controller, a test chamber, a vacuum pump, a weight sensor, a temperature sensor, a vacuum sensor, and a fixture; the fixture is disposed within the test chamber and is used to fix the composite insulator sample to be tested; the electric heating controller is electrically connected to the test chamber and is used to heat the composite insulator sample to be tested in the test chamber; the vacuum pump is connected to the test chamber and is used to adjust the vacuum level in the test chamber; the intelligent device is electrically connected to the weight sensor, the temperature sensor, and the vacuum sensor, and is configured to: at each preset vacuum level, obtain test data of the composite insulator sample to be tested in real time based on the temperature change rate and temperature cycle change range, wherein the test data includes temperature data, vacuum level, first mass, second mass, and a dehumidification rate determined based on the first mass and second mass. The present application achieves rapid and efficient dehumidification of the silicone rubber material of the composite insulator sheath, improving the efficiency of dehumidification detection.

[0049] Some embodiments of the present application provide a method for dehumidifying composite insulator silicone rubber based on vacuum thermal cycle, and a composite insulator silicone rubber dehumidification device based on vacuum thermal cycle is used. The present application is further described in detail below with reference to the accompanying drawings:

[0050] like Figure 2 As shown, the method for dehumidifying silicone rubber of composite insulator based on vacuum thermal cycle includes the following steps:

[0051] S101. Obtain a composite insulator sample.

[0052] The composite insulator sample is the silicone rubber of the shed sheath material of the composite insulator to be tested or a part of the silicone rubber of the shed sheath material of the composite insulator to be tested, wherein the composite insulator to be tested has been in operation or has rapidly absorbed water, for example, the composite insulator to be tested has been in operation for 5 years.

[0053] S102: Preprocess the composite insulator sample to obtain a composite insulator sample to be tested.

[0054] The pretreatment includes removing impurities on the surface of the composite insulator sample to be tested by using anhydrous ethanol.

[0055] S103 . Under different preset vacuum degree values, obtain test data of the composite insulator sample to be tested in real time according to the temperature change rate and the temperature cycle change range.

[0056] The test data includes a first mass, a second mass, and a dehumidification rate; the dehumidification rate is determined based on the first mass and the second mass.

[0057] The composite insulator sample to be tested is set at a preset vacuum value of 10 -3 Pa, 10 -4 Data acquisition is performed under multiple preset vacuum values, such as 100 Pa, obtained by a vacuum sensor. The controller acquires mass data and dehumidification rate measured by a weight sensor using a temperature sensor within a temperature change rate and temperature cycling range. The temperature cycling range is 20-80°C, with a temperature change rate of no less than 1°C / min.

[0058] In some embodiments, test data is collected after a preset number of cycles within a temperature cycling range, wherein the high and low temperatures need to be maintained for a preset time, which may be 5 minutes, and the preset number of cycles needs to be greater than a set value M, which may be 10.

[0059] like Figure 3As shown, after obtaining the composite insulator sample to be tested, the corresponding number of cycles is determined according to different preset vacuum degree values, and at each preset vacuum degree value, the test data of the composite insulator sample to be tested is obtained in real time according to the temperature change rate and the temperature cycle change range. When the number of cycles reaches the number of preset vacuum degree values, the test value is stopped.

[0060] S104: Obtain evaluation data according to the test data.

[0061] The evaluation data is used to evaluate the composite insulator to be tested. The evaluation data is the influence data of drying time, temperature, and vacuum degree on the moisture content of the silicone rubber material, and the composite insulator to be tested is evaluated based on the evaluation data.

[0062] In one experiment, four composite insulators of the same model and with a service life of 5 years were selected. After the samples were pretreated identically with anhydrous ethanol, test data of the composite insulator samples to be tested was obtained in real time based on the temperature change rate and temperature cycle change range under different preset vacuum values. The measurement data are shown in Table 1 below.

[0063] Table 1 Measurement data

[0064]

[0065] The above specific tests show that the vacuum thermal cycle test can remove a large amount of moisture in the silicone rubber of the composite insulator shed sheath material after a set time interval.

[0066] Through comparative experiments, it was found that the composite insulator silicone rubber dehumidification method based on vacuum thermal cycle of the present application has a high dehumidification rate and fast speed.

[0067] The comparative experiment was conducted to obtain four composite insulators of the same model as in the above experiment and with a service life of 5 years. After the samples were pretreated in the same way with anhydrous ethanol, the four samples were heated at the same temperature. The test data of the composite insulator samples to be tested are shown in Table 2 below.

[0068] Table 2 Test data of comparative experiment

[0069]

[0070]

[0071] The comparative experiment shows that the dehumidification rate of silicone rubber, the sheath material of the composite insulator shed, is significantly lower than the dehumidification rate under vacuum thermal cycling in the present application.

[0072] As can be seen from the above technical solution, the present application provides a method for dehumidifying silicone rubber for composite insulators based on vacuum thermal cycling, comprising pre-treating a composite insulator sample to obtain a composite insulator sample to be tested; obtaining test data for the composite insulator sample to be tested in real time based on the temperature change rate and temperature cycling range at each preset vacuum value, wherein the test data includes a first mass, a second mass, and a dehumidification rate determined based on the first and second masses; and determining evaluation data based on the test data at each preset vacuum value when the number of cycles is reached. The present application achieves rapid and efficient dehumidification of silicone rubber, the material used in composite insulator sheaths, improving the efficiency of dehumidification detection.

[0073] The above content is only for explaining the technical idea of ​​the present application and cannot be used to limit the protection scope of the present application. Any changes made on the basis of the technical solution in accordance with the technical idea proposed in the present application shall fall within the protection scope of the claims of the present application.

[0074] In addition, unless expressly stated in the claims, the order of the processing elements and sequences described in this application, the use of alphanumeric characters, or the use of other names are not intended to limit the order of the processes and methods of this application. Although the above disclosure discusses some embodiments currently considered useful through various examples, it should be understood that such details are only for illustrative purposes, and the attached claims are not limited to the disclosed embodiments. On the contrary, the claims are intended to cover all modifications and equivalent combinations that are consistent with the essence and scope of the embodiments of this application. For example, although the system components described above can be implemented by hardware devices, they can also be implemented only by software solutions, such as installing the described system on an existing server or mobile device.

[0075] Similarly, it should be noted that, in order to simplify the description of the present disclosure and thus facilitate understanding of one or more embodiments, the foregoing descriptions of the embodiments of the present disclosure sometimes combine multiple features into a single embodiment, figure, or description thereof. However, this disclosure method does not mean that the subject matter of the present disclosure requires more features than those recited in the claims. In fact, the features of an embodiment may be fewer than all the features of a single embodiment disclosed above.

[0076] Each patent, patent application, patent application disclosure, and other materials, such as articles, books, specifications, publications, documents, etc., cited in this application is hereby incorporated by reference in its entirety. This includes application history documents that are inconsistent with or conflict with the content of this application, as well as documents (currently or subsequently attached to this application) that limit the broadest scope of the claims of this application. It should be noted that if the descriptions, definitions, and / or use of terms in the accompanying materials of this application are inconsistent or conflicting with the content of this application, the descriptions, definitions, and / or use of terms in this application shall prevail.

Claims

1. A dehumidification device for composite insulator silicone rubber based on vacuum thermal cycle, characterized in that: Including intelligent equipment, electric heating controller, test chamber, vacuum pump, weight sensor, temperature sensor, vacuum sensor, fixture; The fixture is arranged inside the test cavity, and is used to fix the composite insulator sample to be tested; The electric heating controller is electrically connected to the test cavity, and is used to heat the composite insulator sample to be tested in the test cavity; The vacuum pump is connected to the test cavity, and the vacuum pump is used to adjust the vacuum degree in the test cavity; The smart device is electrically connected to the weight sensor, the temperature sensor, and the vacuum sensor, and is configured as follows: At each preset vacuum degree value, test data of the composite insulator sample to be tested is obtained in real time according to the temperature change rate and the temperature cycle change range, wherein the test data includes a first mass, a second mass, and an initial weight of a new sample, and a dehumidification rate determined according to the first mass, the second mass, and the initial weight of the new sample; the temperature cycle change range is 20° C. to 80° C., the temperature change rate is not less than 1° C. / min, the first mass is the mass before the test, and the second mass is the mass after the test; The dehumidification device also includes a liquid nitrogen container and a liquid nitrogen pump; The liquid nitrogen container and the test cavity are connected via the liquid nitrogen pump; The smart device is electrically connected to the liquid nitrogen pump, and the smart device is used to control the liquid nitrogen pump to adjust the nitrogen concentration in the test cavity.

2. The dehumidification device for composite insulator silicone rubber based on vacuum thermal cycle according to claim 1, characterized in that: The weight sensor, the temperature sensor, and the vacuum sensor are arranged on the test cavity.

3. The dehumidification device for composite insulator silicone rubber based on vacuum thermal cycle according to claim 1, characterized in that: The dehumidification device also includes a macro controller; The macro controller is connected to the fixture and is used to adjust the position of the composite insulator sample to be tested.

4. A dehumidification device for composite insulator silicone rubber based on vacuum thermal cycle according to claim 1 or 3, characterized in that: The clamp is a ring clamp.

5. A dehumidification method for composite insulator silicone rubber based on vacuum thermal cycle, applied to the dehumidification device for composite insulator silicone rubber based on vacuum thermal cycle according to any one of claims 1 to 4, characterized in that: include: Pre-processing the composite insulator sample to obtain the composite insulator sample to be tested; At each preset vacuum degree value, test data of the composite insulator sample to be tested is obtained in real time according to the temperature change rate and the temperature cycle change range, wherein the test data includes a first mass, a second mass, and an initial weight of a new sample, and a dehumidification rate determined according to the first mass, the second mass, and the initial weight of the new sample; the temperature cycle change range is 20° C. to 80° C., the temperature change rate is not less than 1° C. / min, the first mass is the mass before the test, and the second mass is the mass after the test; When the number of cycles is reached, the evaluation data is determined based on the test data at each preset vacuum value; The evaluation data is used to evaluate the composite insulator to be tested; the evaluation data is the influence data of drying time, temperature, and vacuum degree on the moisture content of the silicone rubber material; The number of cycles is determined according to different preset vacuum values.

6. The method for dehumidifying composite insulator silicone rubber based on vacuum thermal cycle according to claim 5, characterized in that: The pretreatment is to remove impurities on the surface of the composite insulator sample to be tested by using anhydrous ethanol.

7. The dehumidification method of composite insulator silicone rubber based on vacuum thermal cycle according to claim 5, characterized in that: Within a temperature cycle variation range, the temperature is cycled according to a preset number of times, wherein the high temperature and the low temperature need to be maintained for a preset time.

8. The method for dehumidifying composite insulator silicone rubber based on vacuum thermal cycle according to claim 7, characterized in that: The preset time is greater than the set value.

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