An SF6 leakage identification, pressure-resistant and anti-breakage structure and its usage method

Abstract

An SF6 leakage identification, pressure-resistant and anti-breakage structure and its usage method belong to the technical field of the safe operation of power equipment. The SF6 leakage identification, pressure-resistant and anti-breakage structure includes: a first pressure-sensitive layer, an anti-breakage protective layer, and a second pressure-sensitive layer that are sequentially applied from the inside to the outside of the surface of the self-inflating device; the first pressure-sensitive layer has adhesiveness and elasticity and is applied to the surface of the inflating device without gaps; the anti-breakage protective layer has a fluctuating fold structure, and the tensile strength of the anti-breakage protective layer is greater than the gas pressure inside the inflating device; the second pressure-sensitive layer is applied on the fold structure of the anti-breakage protective layer and has adhesiveness, elasticity, and pressure-induced color change performance. The present invention eliminates the risk of SF6 gas leaking into the atmosphere, forms an effective sealing structure, and provides a solution for large-scale remote monitoring.

Description

Technical Field

[0001] The present invention belongs to the technical field of safe operation of power equipment, and more specifically, relates to an SF6 leakage identification, pressure-resistant and anti-break structure and its usage method. Background Art

[0002] SF6 is an insulating gas widely used in high-voltage electrical equipment and is widely used due to its excellent insulating performance and arc extinguishing ability. However, poor equipment sealing, manufacturing defects, mechanical damage, drastic temperature changes, corrosion or wear, etc. may all cause SF6 gas to leak out of the equipment. The hazards of SF6 gas leaking into the air include: it causes environmental pollution as a greenhouse gas, the equipment internal air pressure decreases leading to a decline in equipment performance, it poses an asphyxiation risk to personnel in a confined space, economic losses due to the high price of SF6 gas, as well as indirect maintenance and downtime costs. Therefore, in engineering practice, technicians are committed to timely detecting SF6 gas leakage and preventing it from leaking into the air.

[0003] In the prior art, a pressure-sensitive material is applied to the surface of an inflatable device using an insulating gas (such as but not limited to SF6 or a mixture of SF6 and N2), and the pressure-sensitive material has a set toughness and ductility; the pressure-sensitive material is adhered to the surface of the inflatable device or sprayed onto the surface of the inflatable device by spraying, and is in close contact with the device without gaps; if the pressure-sensitive material bulges and changes color from the surface of the inflatable device, it can be visually found that SF6 leaks and immediate treatment can be carried out.

[0004] In engineering practice, the areas for improvement of the above pressure-sensitive material are that the strength of the coated pressure-sensitive material is limited and there is a risk of rupture; when the leakage amount is large, it cannot effectively block the leakage point; and when widely applied, it still requires manpower or video monitoring devices for inspection. Summary of the Invention

[0005] To solve the deficiencies in the prior art, the present invention provides an SF6 leakage identification, pressure-resistant and anti-break structure and its usage method, aiming to eliminate the risk of SF6 gas leaking into the atmosphere, form an effective blocking structure, and provide a solution for large-scale remote monitoring.

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

[0007] The first aspect of the present invention provides an SF6 leakage identification, pressure-resistant and anti-break structure, including: a first pressure-sensitive layer, an anti-break protection layer, and a second pressure-sensitive layer sequentially applied from the surface of the inflatable device from the inside out;

[0008] The first pressure-sensitive layer has adhesiveness and elasticity and is applied to the surface of the inflatable device without gaps;

[0009] The anti - rupture protective layer has a fluctuating folded structure, and the tensile strength of the anti - rupture protective layer is greater than the gas pressure inside the inflatable device;

[0010] The second pressure - sensitive layer is applied on the folded structure of the anti - rupture protective layer and has adhesiveness, elasticity and pressure - induced color - change properties.

[0011] Preferably, the anti - rupture protective layer is made of Kevlar material;

[0012] The first pressure - sensitive layer and the second pressure - sensitive layer are made of the same pressure - sensitive material, and both include: an adhesive material, a foaming material, a pressure - induced color - change material and a forming agent; or,

[0013] The first pressure - sensitive layer and the second pressure - sensitive layer are made of different pressure - sensitive materials. The first pressure - sensitive layer includes: an adhesive material, a foaming material and a forming agent, and the second pressure - sensitive layer includes: an adhesive material, a foaming material, a pressure - induced color - change material and a forming agent.

[0014] Preferably, the undulation of the folded structure is any one of periodic repetition, completely random, or a combination of partial periodic repetition and partial randomness.

[0015] Preferably, the folded structure is a serrated structure arranged in periodic repetition.

[0016] Preferably, a straightened metal wire is arranged on the side of the anti - damage protective layer facing the first pressure - sensitive layer. The metal wire is connected to a resistance sensor with a remote - transmission function, and the resistance signal detected by the resistance sensor is remotely transmitted to the remote end in real time;

[0017] The breaking strength of the metal wire is less than the stress of the anti - damage protective layer when it stretches. When the folded structure of the anti - damage protective layer stretches, the metal wire is broken.

[0018] Preferably, insulating wires are arranged and distributed in the folded undulation space and can unfold with the folds. In each folded undulation, a section of metal wire is in parallel with a section of insulating wire, and the resistance of the metal wire is less than that of the insulating wire.

[0019] Preferably, the metal wire is a tungsten wire, and the insulating wire is made of a carbon - based material.

[0020] The second aspect of the present invention provides a usage method of the SF6 leakage - identification, compression - resistance and anti - rupture structure as described in the first aspect, including:

[0021] The first pressure - sensitive layer is applied to the surface of the inflatable device to be tested by spraying or pasting. The first pressure - sensitive layer adheres to the inflatable device without gaps;

[0022] Outside the first pressure - sensitive layer, an anti - rupture protective layer with a folded structure is applied by using the adhesiveness of the first pressure - sensitive material and attached to the first pressure - sensitive layer;

[0023] The second pressure-sensitive layer is applied to the outside of the anti-break protection layer by spraying, and the second pressure-sensitive layer forms the same fold structure as the anti-break protection layer;

[0024] If the inflation device leaks, the first pressure-sensitive layer first intercepts the leaked SF6 gas and forms bubbles; if the amount of SF6 gas leaked from the inflation device exceeds the tolerance range of the first pressure-sensitive layer, the first pressure-sensitive layer is damaged, and the second pressure-sensitive layer that extends with the anti-break protection layer and the anti-break protection layer jointly wrap the leaked SF6 gas and change color at the same time.

[0025] Preferably, a straightened metal wire is applied to the side of the anti-break protection layer facing the first pressure-sensitive layer, and the metal wire is connected to a resistance sensor with remote transmission function. The resistance signal detected by the resistance sensor is remotely transmitted to the remote end in real time;

[0026] The breaking strength of the metal wire is less than the stress of the extension of the anti-break protection layer. When the fold structure of the anti-break protection layer extends, the metal wire is pulled off.

[0027] Preferably, an insulating wire is superimposed on the basis of the structure of the metal wire. The insulating wires are arranged in the fold undulation space and can be unfolded with the folds;

[0028] In each fold undulation, a section of metal wire is connected in parallel with the insulating wire, and the resistance of the metal wire is less than the resistance of the insulating wire.

[0029] Compared with the prior art, the beneficial effects of the present invention at least include:

[0030] 1) Provide a compressive anti-break structure after SF6 gas leakage to prevent the pressure-sensitive material coated on the surface of the power equipment from cracking after the gas leakage amount continuously increases, resulting in the SF6 gas still leaking into the atmosphere;

[0031] 2) Provide a method for plugging after SF6 leakage. When the leakage reaches a certain amount, the compressive anti-break structure supports the pressure-sensitive material from cracking, and the pressure inside the equipment and the pressure inside the anti-break structure reach equilibrium, and the gas no longer leaks continuously, indirectly realizing the plugging of the leaked gas;

[0032] 3) Provide a method for monitoring after SF6 leakage. Through the change of the electrical signal of the compressive anti-break structure, the remote positioning of the leakage point and the analysis and judgment of the leakage degree are realized. Description of the Drawings

[0033] Figure 1 is a schematic diagram showing the expansion of the SF6 leakage identification compressive anti-break structure provided according to the embodiments of the present invention from the initial state to the occurrence of leakage;

[0034] Figure 2Schematic diagram of SF6 leakage identification, compression resistance and knot breaking prevention including metal wire according to an embodiment of the present invention;

[0035] Figure 3 Schematic diagram of SF6 leakage identification, compression resistance and knot breaking prevention including insulating wire according to an embodiment of the present invention;

[0036] Figure 4 Schematic diagram of compression resistance and knot breaking prevention extension applied to an inflation device according to an embodiment of the present invention;

[0037] Figure 5 Schematic diagram of a step signal detected by a resistance sensor according to an embodiment of the present invention. Detailed implementation manners

[0038] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0039] Embodiment 1 of the present invention provides an SF6 leakage identification, compression resistance and knot breaking prevention structure, including: a first pressure-sensitive layer, a knot breaking prevention protection layer, and a second pressure-sensitive layer sequentially applied from the surface of the inflation device from the inside out.

[0040] The first pressure-sensitive layer is a sticky foaming material, having adhesiveness and elasticity, and is closely and seamlessly attached to the surface of the SF6 inflation device by coating. Preferably but not limited to, it is pre-coated on parts such as flange joints where leakage is likely to occur. When SF6 gas in the inflation device leaks, the pressure-sensitive material bulges under the pressure of the leaked gas, wrapping the leaked gas in the pressure-sensitive material and not directly leaking into the atmosphere. Preferably but not limited to, the first pressure-sensitive layer may also have pressure-sensitive color-changing properties.

[0041] The knot breaking prevention protection layer has a fluctuating fold structure, and the fluctuations can be periodic or completely random, or a combination of partial randomness and partial periodicity. Preferably but not restrictively, the fold structure is a serrated structure, and the serrations can be arranged periodically, that is, of the same size, as Figure 2 shown, or a random serrated structure with different sizes, or a serrated structure combining periodic serrations and randomness.

[0042] With the adhesiveness of the first pressure-sensitive layer, the anti-break protection layer is adhered to the outside of the first pressure-sensitive layer. When the SF6 gas leaks in the inflation device, the first pressure-sensitive layer bulges, and the folds of the anti-break protection layer stretch. Because it was originally in a folded structure, it is not easy to break after stretching. It can be understood that any folded structure with undulations can increase the area when unfolded, thereby increasing the anti-break margin. Further preferably, to make the protection effect of the anti-break structure better, the anti-break protection layer is also elastic and can be elastically stretched after the folds are fully stretched. It takes into account both elasticity and rigidity, but the elastic deformation amount is less than the fold stretching deformation amount, and it can also protect the outer second pressure-sensitive layer from breaking.

[0043] The undulating folded structure of the anti-break protection layer can be prefabricated in advance and directly applied to the first pressure-sensitive layer on site. Preferably but not restrictively, the anti-break protection layer is made of "Kevlar" aramid fiber material, etc. This kind of material has low density, high strength, good toughness, high temperature resistance, and is easy to process and form. When acting as the anti-break protection layer, it has good fold stretching performance and elastic stretching performance.

[0044] As Figure 2 As shown, a straightened metal wire is arranged on the side of the anti-break protection layer facing the first pressure-sensitive layer. The metal wire is connected to a resistance sensor with remote transmission function. The resistance signal detected by the resistance sensor is remotely transmitted to the remote end in real time. The breaking strength of the metal wire is less than the stress of the anti-break protection layer when it stretches. When the anti-break protection layer stretches, the metal wire is broken, and the resistance sensor detects a stepwise increase in resistance, so that it can be sensed that the gas in the inflation device has leaked, thereby avoiding personnel checking each device one by one through patrol. This further ensures the timely discovery of the leakage point and improves the intelligence of leakage identification. Especially when the SF6 leakage identification and anti-break structure is widely applied on a large scale, there is no need to rely on the naked eye of personnel to check one by one whether there is leakage. After remote preliminary positioning, when arriving at the site, the leakage point can be quickly found by means of deformation and color change.

[0045] The metal wire is a good conductor. Preferably but not restrictively, the metal wire is a tungsten wire. The tungsten wire is a good conductor at room temperature. The resistance of a tungsten wire with a length of 1 meter and a diameter of 0.4 mm is only about 0.446 Ω at 20 °C, and in engineering practice, it can be approximated as 0 Ω.

[0046] Further preferably, as Figure 3 As shown, in order to more intelligently and remotely identify whether there is leakage and obtain the degree of leakage, on the basis of the metal wire structure of the anti-break protection layer, insulating wires are superimposed. The insulating wires are arranged in the folded undulating space and can unfold with the folds. It is equivalent to that in each fold undulation, a section of metal wire is in parallel with the insulating wire, and the resistance of the metal wire is significantly less than that of the insulating wire.

[0047] Preferably but not limited thereto, the combination of the wire and the insulating wire is a combination of a tungsten wire and a carbon-based material insulating wire. The carbon-based material insulating wire is preferably but not limited to being made of carbon fiber, graphene or carbon nanotubes. The resistivity of these materials differs from that of the tungsten wire by at least two orders of magnitude. The electrical conductivity of the carbon-based insulating wire depends on the microstructure and doping of the carbon material and can be adjusted by those skilled in the art according to the sensitivity requirements in engineering practice.

[0048] As Figure 4 shown, in a more specific embodiment, the resistance of the tungsten wire is close to 0 Ω, and the resistance of the carbon-based insulating wire with a larger resistance value is significantly greater than that of the tungsten wire. When the gas leakage prevention and damage protection layer unfolds and undergoes a slight deformation, every time a section of the tungsten wire is disconnected, a section of the carbon-based insulating wire with a larger resistance value will be serially connected into the measured value of the resistance sensor. The resistance sensor will detect a unit resistance step. As Figure 5 shown, by dividing the total change in resistance by the unit resistance step, the number of broken tungsten wires can be obtained. The number of broken tungsten wires is positively correlated with the unfolding degree of the anti-break protection layer fold structure, that is, the severity of the leakage. Thus, an alarm message about the severity of the leakage can be obtained remotely, which is specifically expressed by the following formula:

[0049]

[0050] In the formula:

[0051] n represents the number of broken tungsten wires,

[0052] ΔR represents the total change in resistance detected by the resistance sensor,

[0053] R 碳基绝缘丝 and R 钨丝 respectively represent the resistance of a section of the carbon-based insulating wire and the resistance of each section of the tungsten wire.

[0054] In a specific implementation example, the resistance of the tungsten wire is close to 0 Ω, and the resistance of the carbon-based insulating wire with a larger resistance value is significantly greater than that of the tungsten wire. For example but not limited thereto, the resistance of each folded small section is 40 Ω. When the gas leakage prevention and damage protection layer unfolds and undergoes a slight deformation, every time a section of the tungsten wire is disconnected, a section of the carbon-based insulating wire with a larger resistance value will be serially connected into the measured value of the resistance sensor. For example, when a small section of the tungsten wire is disconnected, the resistance signal will rise from the original value close to 0 to 40 Ω. The total resistance signal rises by 320 Ω, indicating that 8 sections of the tungsten wire have been disconnected. While realizing the leakage positioning, an analysis and judgment of the leakage degree are formed.

[0055] The second pressure-sensitive layer is coated on the outer surface of the anti-breakage protective layer to form a wrinkled structure identical to that of the anti-breakage protective layer. Preferably but not limited to, if the anti-breakage protective layer is serrated, the second pressure-sensitive layer also forms serrations. The second pressure-sensitive layer and the first pressure-sensitive layer are made of the same adhesive foaming material. When the first pressure-sensitive layer bulges, the wrinkles of the anti-breakage protective layer extend under the push of the first pressure-sensitive layer, and the second pressure-sensitive layer coated on the outer surface of the anti-breakage protective layer extends accordingly. If the extension exceeds the discoloration pressure threshold of the second pressure-sensitive layer, the second pressure-sensitive layer changes color. Preferably but not limited to, the second pressure-sensitive layer is applied to the outer surface of the anti-breakage protective layer by spraying.

[0056] The anti-breakage protective layer can also protect the first and second pressure-sensitive layers and extend their service life. It should be noted that the advantage of the pressure-sensitive layer is that it is easy to adhere to the inflatable device, but there is a design conflict between the viscosity, strength and toughness. Similarly, considering the actual material selection, it is not easy to achieve tight adhesion to the device while the second anti-breakage protective layer meets the requirements of high strength, good toughness and flexible extensibility. As one of the prominent substantive features of the present invention, the first pressure-sensitive material, the anti-breakage protective layer and the second pressure-sensitive layer are applied successively, so that the advantages and disadvantages of the first pressure-sensitive layer and the anti-breakage protective layer complement each other, resulting in the beneficial technical effects of not only solving the problem of tight adhesion, but also enabling the second pressure-sensitive layer coated on the outer surface of the anti-breakage protective layer to extend first and then deform, avoiding being damaged and not being suitable for observing leakage, and effectively forming a seal to prevent SF6 leakage.

[0057] In one embodiment, the same pressure-sensitive material is used on-site to implement the first pressure-sensitive layer and the second pressure-sensitive layer respectively. The beneficial effect of such implementation is that the manufacturing is simple and the product performance indicators are highly consistent, and there is no need to develop separate formulations for the first pressure-sensitive layer and the second pressure-sensitive layer.

[0058] Specifically, the first pressure-sensitive layer and the second pressure-sensitive layer have the same composition, which includes: an adhesive material, a foaming material, a pressure-induced color change material and a forming agent; the adhesive material is an ethyl acetate compound, with a mass ratio of 70% - 80%; the pressure-induced color change material is a fluoran lactone compound, a methanobenzophthalide compound or a tetraphenylethylene derivative, with a mass ratio of 8 - 12%; the foaming material is a surfactant, with a mass ratio not less than 5% of the total mass. The adhesive material is polyvinyl acetate emulsion, the foaming material is sodium alkylbenzene sulfonate, and the pressure-induced color change material is crystal violet lactone, a tetraphenylethylene-imidazole derivative or a tetraphenylethylene-quinoline derivative.

[0059] In yet another embodiment, the first pressure-sensitive layer omits the pressure-sensitive discoloration material and is manufactured based on an adhesive material, a foaming material, and a molding agent; while the second pressure-sensitive layer is manufactured with an adhesive material, a foaming material, a pressure-induced discoloration material, and a molding agent. The beneficial technical effect of such an implementation is that if the first pressure-sensitive layer has been damaged, or the transparency of the anti-breakage protective layer between the first pressure-sensitive layer and the second pressure-sensitive layer is not high, it is not easy to observe the discoloration of the first pressure-sensitive layer. At this time, it is possible to rely only on the outermost discoloration of the second pressure-sensitive layer to indicate that leakage has occurred.

[0060] Specifically, the components of the first pressure-sensitive layer include: an adhesive material, a foaming material, and a molding agent; the adhesive material is an ethyl acetate compound, with a mass ratio of 75% - 90%; the foaming material is a surfactant, with a mass ratio not less than 5% of the total mass. The adhesive material is polyvinyl acetate emulsion, and the foaming material is sodium alkylbenzene sulfonate. The components of the second pressure-sensitive layer include: an adhesive material, a foaming material, a pressure-induced discoloration material, and a molding agent; the adhesive material is an ethyl acetate compound, with a mass ratio of 70% - 80%; the pressure-induced discoloration material is a fluoran lactone compound, a methanobenzophthalide compound, or a tetraphenylethylene derivative, with a mass ratio of 8 - 12%; the foaming material is a surfactant, with a mass ratio not less than 5% of the total mass. The adhesive material is polyvinyl acetate emulsion, the foaming material is sodium alkylbenzene sulfonate, and the pressure-induced discoloration material is crystal violet lactone, a tetraphenylethylene-imidazole derivative, or a tetraphenylethylene-quinoline derivative.

[0061] When the anti-breakage protective layer is unfolded, when the gas pressure enclosed by the anti-breakage protective layer and the second pressure-sensitive layer gradually approaches the pressure inside the inflation device, the gas inside the inflation device will no longer leak, and the anti-breakage protective layer and the second pressure-sensitive layer form a kind of seal. For example but not limited to, the absolute pressure of SF6 gas in an electrical equipment is generally ≤0.6MPa, not particularly large. As long as the material selected for the anti-breakage protective layer can withstand the pressure inside the inflation device, that is, the unfolding and deformation of the anti-breakage protective layer can withstand a pressure above 0.6MPa, it can not only hold it, but also form a sealing structure after the pressure is balanced.

[0062] Embodiment 2 of the present invention provides a method for using an SF6 leakage identification, pressure-resistant, and anti-breakage structure, including the following steps:

[0063] Step 1: Apply the first pressure-sensitive layer to the surface of the inflation device to be tested. Preferably but not limited to, apply the first pressure-sensitive layer by spraying or pasting. When the inflation device has not leaked, the first pressure-sensitive layer is tightly adhered to the inflation device without gaps.

[0064] Step 2: Outside the first pressure-sensitive layer, utilize the adhesiveness of the first pressure-sensitive material to apply an anti-breakage protective layer with a wrinkled structure and attach it to the first pressure-sensitive layer.

[0065] On one side of the anti-damage protective layer facing the first pressure-sensitive layer, a straightened metal wire is applied, and the metal wire is connected to a resistance sensor with remote transmission function. The signal of the resistance sensor can be remotely transmitted in real time. The breaking strength of the metal wire is less than the stress of the anti-damage protective layer when it stretches. When the anti-damage protective layer stretches, the metal wire is broken, and the resistance sensor detects an increase in resistance, so it can be known that the gas in the equipment has leaked, avoiding the need for personnel to check each equipment one by one through patrol.

[0066] Based on the structure of the metal wire, an insulating wire is superimposed. The insulating wire is arranged in the wrinkled space and can unfold with the wrinkles. It is equivalent to that in each wrinkle, a section of metal wire is connected in parallel with the insulating wire, and the resistance of the metal wire is less than that of the insulating wire.

[0067] Step 3: Apply a second pressure-sensitive layer on the outside of the anti-damage protective layer. Preferably but not limited to, the second pressure-sensitive layer is applied by spraying, and the second pressure-sensitive layer forms the same wrinkled structure as the anti-damage protective layer.

[0068] In one embodiment, the first pressure-sensitive layer and the second pressure-sensitive layer are applied with the same pressure-sensitive material. Both the first pressure-sensitive layer and the second pressure-sensitive layer have adhesive, foaming, and color-changing properties. In another embodiment, the first pressure-sensitive layer and the second pressure-sensitive layer are applied with different pressure-sensitive materials. The first pressure-sensitive layer has adhesive and foaming properties, while the second pressure-sensitive layer has adhesive, foaming, and color-changing properties. The thicknesses of the first pressure-sensitive layer and the second pressure-sensitive layer are the same. From the perspective of coating requirements, preferably but not limited to, the first layer can be sprayed or pasted, and the spraying method for the third layer is more convenient.

[0069] Step 4: If the inflatable equipment leaks, the first pressure-sensitive layer first intercepts the leaked gas and forms bubbles. If the leaked gas of the inflatable equipment exceeds the tolerance value of the first pressure-sensitive layer, the first pressure-sensitive layer is damaged. At this time, the second pressure-sensitive layer that stretches with the anti-damage protective layer and the anti-damage protective layer jointly further wrap the gas, and at the same time change color, adding a second interception layer for the leaked SF6 gas to prevent it from leaking into the atmosphere.

[0070] As Figure 2 shown, when the anti-damage protective layer stretches, the straightened metal wire arranged on the side of the anti-damage protective layer facing the first pressure-sensitive layer breaks, and the resistance sensor connected to it sends a signal of a sudden increase in resistance to the remote end, issuing an alarm for the leakage event. The alarm information includes the location information of the equipment where the metal wire is located. After preliminary remote positioning, when the disposal personnel arrive at the scene, they can quickly find the leakage point by means of deformation and color change.

[0071] As Figure 3As shown, when the anti-destruction protection layer stretches, the metal wire breaks, and the insulating wires arranged in parallel with the metal wires in sections within the undulating space of the folds unfold along with the folds. The connection topology between the metal wires and the insulating wires changes, resulting in a change in resistance. The resistance sensor connected to the metal wires sends a resistance mutation increase signal to the remote end, and issues an alarm for the leakage event. The alarm information includes the equipment location information of the first and second metal wires, and the diagnosis result of the leakage degree.

[0072] When the anti-destruction protective layer is unfolded, when the pressure of the gas wrapped by the anti-destruction protective layer and the second pressure-sensitive layer gradually becomes equal to the pressure inside the inflatable device, the gas inside the inflatable device will not continue to leak, and the anti-destruction protective layer and the second pressure-sensitive layer are equivalent to forming a plug. For example, but not limited to, the absolute pressure of SF6 gas in electrical equipment is generally ≤0.6MPa, which is not particularly large. As long as the material of the anti-destruction protective layer can withstand the pressure inside the inflatable device, that is, the unfolding and deformation of the anti-destruction protective layer can withstand a pressure of more than 0.6MPa, it can not only hold it, but also form a plugging structure when the pressure is balanced. It can be understood that the degree of leakage is positively correlated with the number of broken sections of the metal wire, which is manifested as the greater the change in resistance value, the greater the degree of leakage.

[0073] The SF6 leakage identification pressure-resistant and anti-breakage structure proposed in the present invention can prevent the pressure-sensitive material from being damaged when the amount of leaked SF6 gas increases, thereby preventing it from directly leaking into the atmosphere, thereby better avoiding the emission of high-greenhouse gas SF6.

[0074] 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 SF6 leakage identification, pressure-resistant and anti-breakage structure, characterized in that: include: A first pressure-sensitive layer, an anti-breakage protection layer, and a second pressure-sensitive layer are sequentially applied from the inside to the outside of the inflatable device surface; The first pressure-sensitive layer has adhesiveness and elasticity and is applied to the surface of the inflatable device without gaps; The anti-breakage protection layer has an undulating fold structure, and the tensile strength of the anti-breakage protection layer is greater than the gas pressure in the inflatable device; a straightened metal wire is arranged on the side of the anti-breakage protection layer facing the first pressure-sensitive layer, and the metal wire is connected to a resistance sensor with a remote transmission function, and the resistance signal detected by the resistance sensor is remotely transmitted to the remote end in real time for remote preliminary positioning; The breaking strength of the metal wire is less than the stress of the stretching of the anti-destruction protection layer. When the fold structure of the anti-destruction protection layer stretches, the metal wire is broken. The insulating wire is arranged in the fold undulation space and can be unfolded with the folds. In each fold undulation, a section of the metal wire is connected in parallel with a section of the insulating wire, wherein the resistance of the metal wire is less than the resistance of the insulating wire. The second pressure-sensitive layer is applied onto the folded structure of the anti-break protection layer, has adhesive, elastic and pressure-induced color-changing properties, and is used for finding leakage points on site.

2. The SF6 leakage identification, pressure-resistant and anti-breakage structure according to claim 1 is characterized by: The anti-break protection layer is made of Kevlar material; The first pressure-sensitive layer and the second pressure-sensitive layer are made of the same pressure-sensitive material, both of which include: an adhesive material, a foaming material, a pressure-chromic material and a molding agent; or, The first pressure-sensitive layer and the second pressure-sensitive layer are made of different pressure-sensitive materials. The first pressure-sensitive layer includes: an adhesive material, a foaming material and a molding agent, and the second pressure-sensitive layer includes: an adhesive material, a foaming material, a pressure-chromic material and a molding agent.

3. The SF6 leakage identification, pressure-resistant and anti-breakage structure according to claim 1 is characterized by: The undulation of the pleated structure is any one of periodic repetition, completely random, or a combination of partial periodic repetition and partial random.

4. The SF6 leakage identification, pressure-resistant and anti-breakage structure according to claim 1 or 3, characterized in that: The fold structure is a sawtooth structure that is periodically and repeatedly arranged.

5. The SF6 leakage identification, pressure-resistant and anti-breakage structure according to claim 1 is characterized by: The metal wire is a tungsten wire, and the insulating wire is made of a carbon-based material.

6. A method for using the SF6 leakage identification, pressure-resistant and anti-breakage structure according to any one of claims 1 to 5, characterized in that: include: Applying the first pressure-sensitive layer to the surface of the inflatable device to be tested by spraying or pasting, so that the first pressure-sensitive layer and the inflatable device are adhered to each other without any gap; On the outside of the first pressure-sensitive layer, an anti-breakage protection layer with a pleated structure is applied by utilizing the viscosity of the first pressure-sensitive material, and the anti-breakage protection layer is attached to the first pressure-sensitive layer; a straightened metal wire is applied to the side of the anti-breakage protection layer facing the first pressure-sensitive layer, and the metal wire is connected to a resistance sensor with a remote transmission function, and the resistance signal detected by the resistance sensor is remotely transmitted to the remote end in real time; The breaking strength of the metal wire is less than the stress of the stretching of the anti-destruction protective layer. When the fold structure of the anti-destruction protective layer stretches, the metal wire is broken. An insulating wire is superimposed on the structure of the metal wire, and the insulating wire is arranged in the space of the folds and can be unfolded with the folds; in each fold, a section of the metal wire is connected in parallel with the insulating wire, wherein the resistance of the metal wire is less than the resistance of the insulating wire; Applying a second pressure-sensitive layer on the outside of the anti-breakage protective layer by spraying, the second pressure-sensitive layer forming the same fold structure as the anti-breakage protective layer; If the inflation device leaks, the first pressure-sensitive layer will first intercept the leaked SF6 gas and bubble it; if the amount of SF6 gas leaked from the inflation device exceeds the bearing capacity of the first pressure-sensitive layer, the first pressure-sensitive layer will be damaged, and the second pressure-sensitive layer stretched along with the anti-break protective layer will jointly wrap the leaked SF6 gas with the anti-break protective layer and change color at the same time.

7. The method of use according to claim 6, characterized in that: When the wrinkled structure of the anti-destruction protective layer stretches, the stretched metal wire breaks, and the resistance sensor connected to it sends a resistance step increase signal to the remote end, issuing an alarm for the leakage event. The alarm information includes the location information of the device where the metal wire is located.

8. The method of use according to claim 6, characterized in that: When the anti-destruction protective layer stretches, the metal wire breaks, and the insulating wire arranged in parallel with the metal wire in the wrinkled space expands along with the wrinkles. The connection topology between the metal wire and the insulating wire changes, resulting in a change in resistance. The resistance sensor connected to it sends a resistance step increase signal to the remote end, and issues an alarm for the leakage event. The alarm information includes the location information of the equipment where the metal wire and the insulating wire are located, and the diagnosis result of the leakage degree.

9. The method of use according to claim 8, characterized in that: Every time a section of metal wire is disconnected, a section of insulating wire will be connected in series to the value measured by the resistance sensor. The resistance sensor detects a unit resistance step, and the total change in resistance detected by the resistance sensor is divided by the unit resistance step to obtain the number of tungsten wire breaks, which is used to characterize the severity of the leakage and is sent to the remote end as a leakage severity alarm message.

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