Pressure-sensitive material and insulating gas leakage identification method based on pressure-sensitive material

Abstract

A pressure-sensitive material and an insulating gas leakage identification method based on the pressure-sensitive material, the intuitive identification method includes the following steps: applying a pressure-sensitive material on the surface of an inflatable device using insulating gas (sulfur hexafluoride or a sulfur hexafluoride mixture), the pressure-sensitive material having a set toughness and ductility, and changing color after deformation; when the pressure-sensitive material bulges from the surface of the inflatable device and changes color, the insulating gas leakage is visually discovered and immediately processed. The components of the pressure-sensitive material include: an adhesive material, a foaming material, a piezochromic material, and a molding agent; the adhesive material accounts for 70% to 80% by weight; the piezochromic material accounts for 8 to 12% by weight; and the foaming material should not be less than 5% of the total weight. The present invention detects the leakage point in a timely and intuitive manner, and can prevent sulfur hexafluoride from leaking into the atmosphere, and prevent the greenhouse gas sulfur hexafluoride from being discharged into the atmosphere and causing harm to the environment.

Description

Technical Field

[0001] The present invention belongs to the technical field of safe operation of electric power equipment, and more specifically, relates to a pressure-sensitive material and an insulating gas leakage identification method based on the pressure-sensitive material. Background Art

[0002] Sulfur hexafluoride gas has excellent insulation and arc extinguishing properties, and sulfur hexafluoride gas insulation can greatly reduce the space volume and floor space of electrical equipment, and is widely used in the power industry at home and abroad. However, sulfur hexafluoride has an extremely strong greenhouse effect. The greenhouse effect of a single molecule of sulfur hexafluoride is 23,500 times that of carbon dioxide. Avoiding the direct emission of sulfur hexafluoride into the atmosphere is an important part of making good use of sulfur hexafluoride. Sulfur hexafluoride is filled into the equipment for medium and long-term use, and the equipment is prone to leaks during long-term operation. The gas is colorless and odorless, and it is difficult to detect directly. Traditional leak detection relies on methods such as wrapping, bottle buckling, and pressure conversion, all of which require a period of follow-up detection. It has the disadvantages of being non-intuitive and unable to directly detect sulfur hexafluoride leaks.

[0003] Prior art document 1 (CN 116371226 A) discloses a method for preparing a leak detection liquid for transformer oil tank gas pressure leak detection, which is used to check whether the transformer and its accessories have leaks. It is worth noting that the prior art represented by comparative document 1 can only test whether there is a leak, but cannot immediately detect the leak when it starts, and cannot recover the leaked gas.

[0004] In order to detect in real time whether there is a leakage of sulfur hexafluoride in the equipment, handle it in time, and avoid the discharge of sulfur hexafluoride into the atmosphere, the present invention proposes an intuitive method for identifying sulfur hexafluoride leakage. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a pressure-sensitive material and an insulating gas leakage identification method based on the pressure-sensitive material.

[0006] The present invention adopts the following technical solution.

[0007] A first aspect of the present invention provides a method for intuitively identifying insulating gas leakage, comprising the following steps:

[0008] Applying a pressure-sensitive material on the surface of an inflatable device using insulating gas, wherein the pressure-sensitive material has a set toughness and ductility and changes color after deformation;

[0009] When the pressure-sensitive material bulges from the surface of the inflatable device and changes color, the insulating gas leakage is visually detected and handled immediately.

[0010] Preferably, the insulating gas is sulfur hexafluoride or a mixture of sulfur hexafluoride and nitrogen.

[0011] Preferably, the pressure-sensitive material is adhesive-type and is adhered to the surface of the inflatable device, and after being adhered, it fits the inflatable device without any gap; or,

[0012] The pressure-sensitive material is also a coating type, which is sprayed on the surface of the inflatable device by spraying. After contacting the air, it quickly dries and becomes a thin film covering the surface of the device, and fits tightly to the device without any gaps.

[0013] Preferably, after a leak occurs, the bulged and discolored portion is recovered, and the insulating gas in the bubble is collected uniformly to avoid being discharged into the atmosphere. At the same time, the leak point of the inflation equipment is promptly handled to prevent further leakage.

[0014] The second aspect of the present invention provides a pressure-sensitive material for insulating gas leakage detection, which is applied to the above-mentioned method for intuitively identifying insulating gas leakage, wherein the pressure-sensitive material comprises: an adhesive material, a foaming material, a pressure-chromic material and a molding agent;

[0015] The mass proportion of adhesive materials is 70%~80%; the mass proportion of pressure-induced color-changing materials is 8%~12%; and the mass proportion of foaming materials should not be less than 5% of the total mass.

[0016] Preferably, the adhesive material is an ethyl acetate compound, the foaming material is a surfactant, and the pressure-induced chromic material is a fluorane lactone compound, a methanephthalide compound or a tetraphenylethylene derivative.

[0017] Preferably, the adhesive material is polyvinyl acetate emulsion, the foaming material is sodium alkylbenzene sulfonate, and the pressure-induced chromic material is crystal violet lactone, tetraphenylethylene-imidazole derivatives or tetraphenylethylene-quinoline derivatives.

[0018] A third aspect of the present invention provides a method for preparing a pressure-sensitive material for insulating gas leakage detection, comprising the following steps:

[0019] Step 1: Weigh a set mass of adhesive material, put it into a reaction container, add a stirrer, and heat it to a set temperature;

[0020] Step 2: Maintaining the reaction temperature, add a set amount of the piezochromic material to the adhesive material until it is completely dissolved and evenly dissolved;

[0021] Step 3: Add a set amount of foaming material to the mixture prepared in step 2, and stir to mix evenly;

[0022] Step 4: Add the molding agent to the mixture prepared in step 3 and stir continuously to keep the mixture uniform without producing lumps or agglomerated particles;

[0023] Step 5: When the temperature cools to room temperature, package the prepared mixture and save it for later use.

[0024] Preferably, in step 1, a polyvinyl acetate solution with a mass of 10 m is weighed and placed in a reaction container, a stirrer is added, the temperature is raised to about 70° C., and under stirring, a small amount of polyvinyl alcohol, polyvinyl formal, potassium persulfate, and starch are added for modification to improve the toughness and temperature adaptability of the polyvinyl acetate solution.

[0025] Preferably, in step 2, the reaction temperature is maintained at 70°C±2°C, and a mass of m of tetraphenylethylene-imidazole derivative is added to the modified polyvinyl acetate solution in multiple times until it is completely dissolved and uniformly dissolved.

[0026] Preferably, in step 3, the pH value is adjusted to be close to neutral, and 0.5 m~m sodium alkylbenzene sulfonate is added to the mixed liquid mixture, and stirred to mix evenly.

[0027] Preferably, in step 4, the forming agent is dripped into the mixed liquid material in small amounts and multiple times, and stirred continuously to keep the mixture uniform without producing lumps or agglomerated particles. The mixed liquid tends to be viscous. When the viscosity is good and the mixture is still fluid, the heating and stirring are stopped.

[0028] Compared with the prior art, the beneficial effects of the present invention include at least the following: after the material of the present invention is sprayed or pasted onto the surface of the equipment, once sulfur hexafluoride leaks, bubbling and discoloration will be found, and the leaked sulfur hexafluoride can be wrapped for easy recovery without causing sulfur hexafluoride gas to leak into the atmosphere; the leakage point can be found in a timely and intuitive manner, and sulfur hexafluoride can be prevented from leaking into the atmosphere, thereby preventing the greenhouse gas sulfur hexafluoride from being discharged into the atmosphere and causing harm to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a diagram of the changes before and after the sulfur hexafluoride equipment leaked.

[0030] Figure 2 A flow chart for the preparation method of sensitive materials. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only embodiments of a part of the present invention, not all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0032] Figure 1It is a schematic diagram of sulfur hexafluoride equipment before and after leakage provided in accordance with an embodiment of the present invention. The pressure-sensitive material is coated or pasted on the connection of the equipment that is prone to gas leakage. When sulfur hexafluoride leaks, the pressure-sensitive material is bubbled by the gas and the color changes at the same time. The operation and maintenance personnel can intuitively find the sulfur hexafluoride leakage and deal with it immediately.

[0033] Specifically, Figure 1 As shown, embodiment 1 of the present invention provides a method for intuitively identifying insulating gas leakage, comprising the following steps:

[0034] Applying a pressure-sensitive material on the surface of an inflatable device using insulating gas, wherein the pressure-sensitive material has a set toughness and ductility and changes color after deformation;

[0035] When the pressure-sensitive material bulges from the surface of the inflatable device and changes color, sulfur hexafluoride leakage is visually detected and handled immediately.

[0036] Preferably, the insulating gas is sulfur hexafluoride or a mixture of sulfur hexafluoride and nitrogen.

[0037] Preferably, a pressure-sensitive material is applied to the surface of the connection of the inflatable device that is prone to leakage.

[0038] Preferably, the pressure-sensitive material is adhesive and can be easily adhered to the surface of the inflatable device, and after being adhered, it fits tightly to the device without any gaps.

[0039] Alternatively, the pressure-sensitive material may be a coating material, which is sprayed onto the surface of the inflatable device. After contacting the air, it dries quickly and becomes a thin film covering the surface of the device, and fits tightly to the device without any gaps.

[0040] Preferably, the pressure-sensitive material is disposable and becomes ineffective when deformation and discoloration occur due to pressure changes. When a leak needs to be tested again later, new pressure-sensitive material needs to be re-applied.

[0041] Preferably, an expiration date is set for the pressure-sensitive material. When the expiration date is exceeded, new pressure-sensitive material needs to be replaced to better monitor whether there are leaks in the equipment.

[0042] When sulfur hexafluoride leaks, the pressure-sensitive material bulges and changes color from the surface of the inflatable device, which can be visually discovered by patrol personnel; preferably, after the leakage occurs, the bulged and discolored part is recovered, and the sulfur hexafluoride gas in the bubble is collected uniformly to avoid discharge into the atmosphere, and at the same time, the leakage point of the inflatable device is dealt with in time to prevent further leakage.

[0043] Embodiment 3 of the present invention provides a pressure-sensitive material for insulating gas leakage detection, the components of which include: an adhesive material, a foaming material, a pressure-chromic material and a molding agent.

[0044] Preferably, the adhesive material is the main reagent, and the added amount should account for 70% to 80% of the final synthetic product; the proportion of the pressure-induced chromic material should be around 10%, for example but not limited to 8 to 12%. Too high a content will affect the viscosity and foaming properties of the material, while too low a content will not be obvious. The foaming material should not be less than 5% of the total amount. A high content is more likely to cause foaming, but the toughness of the material decreases and it is easy to break, while a low content is insensitive to leakage of low levels of sulfur hexafluoride.

[0045] Preferably, the adhesive material is a vinyl acetate compound, such as but not limited to polyvinyl acetate emulsion, the main function of which is to ensure that the material can be reliably adhered to the device housing;

[0046] Preferably, the foaming material is a surfactant, such as but not limited to sodium alkylbenzene sulfonate, which mainly functions to enable the material to bubble and collect gas after gas leakage, and at the same time present deformation after gas leakage;

[0047] Preferably, the pressure-induced color-changing material is a fluorane lactone compound, a methanephthalide compound, a tetraphenylethylene derivative, etc., preferably but not limited to, such as crystal violet lactone, a tetraphenylethylene-imidazole derivative, a tetraphenylethylene-quinoline derivative, and the main function is that the color changes after the pressure on the material changes, so that the gas leakage is more intuitively displayed;

[0048] Preferably, a shaping agent is used to shape the mixture better, such as, but not limited to, a mixture of sodium chloride, surfactant, water, and the like.

[0049] like Figure 2 As shown, embodiment 4 of the present invention provides a method for preparing a pressure-sensitive material for insulating gas leakage detection, characterized in that it includes the following steps:

[0050] Step 1: Weigh a set mass of adhesive material, put it into a reaction container, add a stirrer, and heat it to a set temperature.

[0051] Preferably, in step 1, a small amount of modifying material is added under stirring to improve the toughness and temperature adaptability of the polyvinyl acetate solution.

[0052] Further preferably, in step 1, a polyvinyl acetate solution with a mass of 10 m is weighed and placed in a reaction vessel, a stirrer is added, the temperature is raised to about 70°C, and under stirring, a small amount of polyvinyl alcohol, polyvinyl formal, potassium persulfate, and starch are added for modification to improve the toughness and temperature adaptability of the polyvinyl acetate solution.

[0053] Step 2: Maintain the reaction temperature, take a set mass of the piezochromic material and add it to the adhesive material until it is completely dissolved and evenly dissolved.

[0054] Preferably, in step 2, the reaction temperature is maintained at 70°C ± 2°C, and about m mass of tetraphenylethylene-imidazole derivative is added to the modified polyvinyl acetate solution in multiple portions until it is completely dissolved and uniformly dissolved.

[0055] Step 3: Add a set amount of foaming material to the mixture prepared in step 2, and stir to mix evenly;

[0056] Preferably, in step 3, the pH value is adjusted to be close to neutral, and 0.5 m~m sodium alkylbenzene sulfonate is added to the mixed liquid mixture, and stirred to mix evenly.

[0057] Step 4: Add the molding agent to the mixture prepared in step 3 and stir continuously to keep the mixture uniform without producing lumps or agglomerated particles.

[0058] Preferably, in step 4, the forming agent is dripped into the mixed liquid material in small amounts and multiple times, and stirred continuously to keep the mixture uniform without producing lumps or agglomerated particles. The mixed liquid tends to be viscous. When the viscosity is good and the mixture is still fluid, the heating and stirring are stopped.

[0059] Step 5: When the temperature cools to room temperature, package the prepared mixture and save it for later use.

[0060] It is worth noting that the most prominent substantive feature of the present invention and one of the significant advances brought to the prior art is that the optimal conditions for synthesizing the pressure-sensitive material are obtained through experimental simulation, specifically including:

[0061] (1) Effect of temperature

[0062] At room temperature, the mixed reaction effect of adhesive materials, foaming materials, pressure-induced color-changing materials, and molding agents is not good and the uniformity is poor. As the temperature rises, the reaction speed becomes faster and the reaction products tend to be uniform. However, when the temperature is too high, the viscosity of the material will be reduced and the material will become brittle. The optimal reaction temperature is 70±2℃. After the reaction is completed, cool it down and seal it for storage.

[0063] (2) Effect of pH value

[0064] When the pH value is greater than 9, the reaction speed is fast, the mixture quickly becomes clumpy, and the uniformity, viscosity, and color change performance are all poor; when the pH value is less than 4, the reaction speed is slow, obvious particles appear in the mixture, and the reaction may even be unable to proceed. It is best to adjust the reaction pH to 6~8.

[0065] (3) Modification of polyvinyl acetate solution

[0066] When the polyvinyl acetate solution purchased directly on the market is used to make pressure-sensitive materials, the resulting pressure-sensitive materials are prone to breakage after being coated on the surface of the equipment. They have poor heat resistance and water resistance and are also prone to breakage when the pressure of the leaked gas is high. The polyvinyl acetate solution needs to be modified to improve its toughness and environmental adaptability.

[0067] (4) The amount of various reactants added

[0068] The adhesive material (polyvinyl acetate solution) is the main reagent, and the added amount should account for 70%~80% of the final synthetic product; the pressure-induced chromic material (tetraphenylethylene-imidazole derivative) should account for about 10%. Too high a proportion will affect the viscosity and foaming of the material, and too low a proportion will make the discoloration less obvious; the foaming material should not be less than 5% of the total amount. A high content will make it more prone to foaming, but the toughness of the material will decrease and it will be easy to break. A low content will be insensitive to low-level sulfur hexafluoride leakage.

[0069] (5) Order of adding various reactants

[0070] The piezochromic material (tetraphenylethylene-imidazole derivative) should be mixed evenly with the modified adhesive material (polyvinyl acetate solution) first. If it is added after the reaction, it will be difficult to mix evenly. The foaming material (sodium alkylbenzene sulfonate) should be added before the molding agent. If the molding agent is added first, the mixture will easily become lumps and the viscosity will be reduced.

[0071] It can be understood that as a prominent substantive feature of the present invention and a significant improvement over the prior art, when there is a leak in the equipment, sulfur hexafluoride leaks out, causing the pressure-sensitive material to bubble and deform, which can be directly discovered. When the pressure of the pressure-sensitive material changes, the color of the material will also change, that is, the color will appear while bubbling, so that the operation and maintenance personnel can observe the leak more quickly.

[0072] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for intuitively identifying insulating gas leakage, characterized in that: The following steps are involved: A pressure-sensitive material is applied on the surface of an inflatable device using insulating gas, wherein the pressure-sensitive material has set toughness and ductility and changes color after deformation; the insulating gas is sulfur hexafluoride or a mixture of sulfur hexafluoride and nitrogen; The pressure-sensitive material is of adhesive type, and is adhered to the surface of the inflatable device, and after being adhered, it fits the inflatable device without any gaps; or, the pressure-sensitive material is of coating type, and is sprayed on the surface of the inflatable device by spraying, and quickly dries after contact with air to become a thin film covering the surface of the device, and fits the device tightly without any gaps; when the pressure-sensitive material bulges from the surface of the inflatable device and changes color, leakage of sulfur hexafluoride is visually discovered, and it is immediately handled; The pressure-sensitive material components include: adhesive material, foaming material, pressure-induced color-changing material and forming agent; The adhesive material is an ethyl acetate compound, accounting for 70% to 80% by mass; the pressure-induced chromic material is a fluorane lactone compound, a methanephthalide compound or a tetraphenylethylene derivative, accounting for 8% to 12% by mass; the foaming material is a surfactant, which should not be less than 5% of the total mass.

2. The method for visually identifying insulating gas leakage according to claim 1, characterized in that: After a leak occurs, the bulged and discolored parts are recovered and the insulating gas in the bubbles is collected to prevent it from being discharged into the atmosphere. At the same time, the leaking points of the inflation equipment are dealt with in time to prevent further leakage.

3. A method for visually identifying insulating gas leakage according to claim 1 or 2, characterized in that: The adhesive material is polyvinyl acetate emulsion, the foaming material is sodium alkylbenzene sulfonate, and the pressure-induced color-changing material is crystal violet lactone, tetraphenylethylene-imidazole derivatives or tetraphenylethylene-quinoline derivatives.

4. A method for preparing a pressure-sensitive material for insulating gas leakage detection, used for preparing the pressure-sensitive material as claimed in claim 1, characterized in that: The following steps are involved: Step 1: Weigh a set mass of adhesive material, put it into a reaction container, add a stirrer, and heat it to a set temperature; Step 2: Maintaining the reaction temperature, add a set amount of the piezochromic material to the adhesive material until it is completely dissolved and evenly dissolved; Step 3: Add a set amount of foaming material to the mixture prepared in step 2, and stir to mix evenly; Step 4: Add the molding agent to the mixture prepared in step 3 and stir continuously to keep the mixture uniform without producing lumps or agglomerated particles; Step 5: When the temperature cools to room temperature, package the prepared mixture and save it for later use.

5. The method for preparing a pressure-sensitive material for insulating gas leakage detection according to claim 4, characterized in that: In step 1, weigh 10 m3 of polyvinyl acetate solution, put it into a reaction container, add a stirrer, heat it to about 70°C, and add a small amount of polyvinyl alcohol, polyvinyl formal, potassium persulfate, and starch under stirring to modify the polyvinyl acetate solution to improve its toughness and temperature adaptability.

6. A method for preparing a pressure-sensitive material for insulating gas leakage detection according to claim 4 or 5, characterized in that: In step 2, the reaction temperature is maintained at 70°C ± 2°C, and a mass of m of tetraphenylethylene-imidazole derivative is added to the modified polyvinyl acetate solution in multiple times until it is completely dissolved and uniformly dissolved.

7. A method for preparing a pressure-sensitive material for insulating gas leakage detection according to claim 4 or 5, characterized in that: In step 3, the pH value is adjusted to be close to neutral, and 0.5 m~m sodium alkylbenzene sulfonate is added to the mixed liquid mixture, and the mixture is stirred and mixed evenly.

8. A method for preparing a pressure-sensitive material for insulating gas leakage detection according to claim 4 or 5, characterized in that: In step 4, the forming agent is dripped into the mixed liquid material in small amounts and multiple times, and the mixture is stirred continuously to keep the mixture uniform without producing lumps or agglomerated particles. The mixed liquid tends to be viscous. When the viscosity is good and the mixture is still fluid, the heating and stirring are stopped.

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