800kv GIS main and auxiliary division double sealing structure and life design method suitable for plateau desert environment

Abstract

The application discloses a 800kV GIS main and auxiliary division double-sealing structure suitable for a plateau desert environment and a full-life design method, which comprises a GIS device shell and a flange, the connecting end of the GIS shell is integrally provided with the flange, the flange connecting part is provided with a main sealing structure and an auxiliary sealing structure, the main sealing structure is located on the side close to the air chamber formed by the GIS shell, and the auxiliary sealing structure is located on the side close to the external environment. The main sealing structure and the auxiliary sealing structure are arranged in the double-sealing structure, the SF6 leakage risk of the GIS device is significantly reduced, the reliability of the sealing structure in the plateau low-pressure environment is improved, the aging of the sealing material is delayed, and the adaptability of the GIS device in the wind-sand and temperature difference cyclic environment is enhanced.

Description

Technical Field

[0001] This invention relates to the field of ultra-high voltage power transmission and transformation equipment technology, and in particular to an 800kV GIS main and auxiliary dual-sealed structure and its full life-cycle design method suitable for plateau and desert environments. Background Technology

[0002] As my country's ultra-high-voltage power transmission projects extend to western plateaus, deserts, and high-altitude areas, 800kV GIS equipment is widely used in substations and converter stations. GIS equipment typically uses SF6 gas as the insulating medium, and its sealing performance directly affects the safety and reliability of the equipment.

[0003] In high-altitude desert environments, GIS equipment faces the following unfavorable conditions for operation: The significant decrease in ambient air pressure leads to a reduction in the pressure difference between the inside and outside of the air chamber, making it difficult for traditional structures that rely on pressure difference to maintain a seal to remain effective for a long time; traditional single O-ring seal structures have insufficient sealing stress and are prone to micro-leakage. Large temperature differences between day and night and seasonal variations, along with frequent temperature cycles, make sealing rubber materials prone to stress relaxation, compression set, and thermal aging. Sand, dust, and occasional precipitation can easily penetrate the sealing interface, exacerbating the wear of the sealing ring and affecting the sealing stability; The design life of ultra-high voltage GIS equipment is generally required to be no less than 30 years, but the existing sealing structure is difficult to guarantee the sealing reliability throughout the entire life cycle under extreme environments.

[0004] Currently, most O-ring seals are single-ring seals, which do not separate airtightness from protection; the sealing grooves are mostly standard rectangular grooves, which make it difficult to maintain the sealing stress under low pressure environments.

[0005] Existing sealing structure designs mostly focus on initial sealing performance, lacking a collaborative design method for structure-stress-electric field-life for extreme environments.

[0006] Therefore, there is an urgent need for a new type of GIS sealing structure and design method that is highly reliable and has a long service life, specifically designed for the characteristics of plateau desert environments. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the present invention provides a kV GIS main and auxiliary dual-sealing structure suitable for plateau desert environments, including a GIS equipment shell and a flange. The flange is integrally provided at the connection end of the GIS shell. The flange connection part is provided with a main sealing structure and an auxiliary sealing structure. The main sealing structure is located on the side close to the air chamber formed by the GIS shell, and the auxiliary sealing structure is located on the side close to the external environment. The main sealing structure includes flange one, flange two and sealing ring two. An integral convex ring two is provided at the end of flange one near the central axis. An annular groove two that mates with the convex ring two is provided at the end of flange two near the central axis. Sealing ring two is provided in the annular groove two. The auxiliary sealing structure includes flange one, flange two, and sealing ring one. Flange one has an integral convex ring one at one end, which is located outside convex ring two. A sealing groove one is formed at one end of convex ring one. Flange two has an annular groove one that mates with convex ring one at one end. A sealing groove two that mates with sealing groove one is formed in annular groove one. A sealing ring one is formed in sealing groove one and sealing groove two.

[0008] A life-cycle design method for an 800kV GIS main and auxiliary dual-sealed structure suitable for plateau and desert environments, characterized by the following steps: (1) A sealing life prediction system based on sealing contact stress attenuation is constructed, including a structural parameter acquisition unit, an environmental parameter acquisition unit, a contact stress calculation unit, a stress attenuation calculation unit, a life determination unit, and a life output unit. The structural parameter acquisition unit is used to collect the structural and material parameters of the GIS main seal; the environmental parameter acquisition unit is used to collect the working environment parameters of the plateau desert; the contact stress calculation unit is used to calculate the initial contact stress of the sealing ring; the stress attenuation calculation unit is used to construct and calculate the contact stress attenuation model under the coupled environment; the life determination unit is used to perform the comparison and determination of contact stress and critical stress to realize the iterative calculation logic; and the life output unit is used to output the predicted service life and the sealing life safety margin. (2) The initial compression of the sealing ring, the structural parameters of the sealing groove, the elastic modulus and aging characteristics of the sealing material are collected by the structural parameter acquisition unit; the operating environment air pressure, equivalent electric field strength of the sealing area, temperature and temperature cycle conditions of the plateau desert are collected by the environmental parameter acquisition unit. A seal life prediction system based on seal contact stress attenuation. (3) The contact stress calculation unit calculates the initial contact stress of the sealing ring based on the theory of elasticity and the sealing assembly state. ; (4) Stress attenuation calculation unit constructs contact stress evolution relationship Furthermore, low-pressure correction, electric field correction, and temperature correction were introduced to obtain a contact stress attenuation model under the coupled environment of plateau and desert. (5) The lifespan determination unit will Contact stress at any moment Critical sealing stress after low-pressure correction In comparison, if ≤ If the seal reaches the end of its lifespan, the time at which this occurs is recorded as the predicted lifespan. ;like If the seal has not reached the end of its lifespan, then the time step will be used. Iterative calculations are performed until the criterion is met; (6) The life output unit outputs the predicted lifespan and the safety margin of the sealing life, which is used for the design optimization and operation and maintenance support of GIS sealing structures.

[0009] Preferably, the composite prediction model is a composite model of a physical-parameter model based on the specific sealing structure of GIS and a system model implemented using a system algorithm process; the attenuation function This paper comprehensively reflects the coupled effects of sealing material aging, stress relaxation, and the high-altitude desert environment, and corrects for these effects with electric field acceleration coefficients and temperature cycling acceleration coefficients, resulting in an exponential decay model.

[0010] in, This is the material aging rate coefficient. This is the stress relaxation rate coefficient.

[0011] Preferably, the low pressure correction is achieved through a pressure correction coefficient. Correcting the critical sealing stress; the electric field is corrected to pass through Corrected decay function; the temperature correction is achieved through Correct the decay function.

[0012] Preferably, the prediction results are used to guide the functional division design of the main seal and auxiliary seal, optimize the sealing groove type and sealing ring compression parameters, compare sealing material schemes, and determine the design life and safety margin of the sealing structure.

[0013] Preferred: Initial contact stress between the sealing ring and the sealing surface after assembly The calculation formula is:

[0014] in, For the elastic modulus of the sealing material, The initial compression ratio of the sealing ring. This is the correction factor for the sealing groove structure.

[0015] Preferred: Low-pressure correction, also known as critical stress correction: Low air pressure at high altitudes reduces the sealing pressure requirement of SF6 gas and alters the gas permeation characteristics of the sealing interface. The unit's air pressure value is obtained through environmental parameters, and the air pressure correction coefficient is calculated. Correct the critical sealing stress: ,

[0016] in, The corrected critical sealing stress. The critical stress for SF6 sealing under standard atmospheric pressure. This represents the actual air pressure in the high-altitude desert. Standard atmospheric pressure.

[0017] Preferred: Electric field correction: The high equivalent electric field in the sealed area will accelerate the aging and degradation of the rubber material. An electric field acceleration coefficient is introduced. Correct the decay function:

[0018] in, The electric field aging sensitivity coefficient, The equivalent electric field strength in the sealed area is expressed in kV / mm.

[0019] Preferred: Temperature Correction: The intense temperature cycling in high-altitude deserts exacerbates material fatigue and performance degradation. Therefore, a temperature cycling acceleration factor is introduced. Combining the Arrhenius equation with the temperature cycle frequency correction decay function:

[0020] in, Temperature cycle frequency, This is the temperature cycling sensitivity coefficient. This represents the temperature difference during a single cycle. Preferred method: Calculate the safety margin of the sealing life based on the predicted lifespan and the design lifespan of the GIS equipment.

[0021] in, Design life of the sealing structure for GIS equipment.

[0022] The technical effects and advantages of this invention are as follows: Compared with the prior art, the beneficial effects of the present invention are: 1. This invention features a dual-seal structure with a main sealing structure and an auxiliary sealing structure, which significantly reduces the risk of SF6 leakage in GIS equipment, improves the reliability of the sealing structure in high-altitude and low-pressure environments, delays the aging of sealing materials, and enhances the adaptability of GIS equipment in windy, sandy, and temperature-differential environments.

[0023] 2. The full life design method of this invention significantly improves the accuracy of life prediction under extreme operating conditions. For the first time, it quantitatively integrates three types of environmental correction factors: low air pressure, electric field acceleration, and temperature cycling, corrects the attenuation law of sealing critical stress and contact stress, and solves the prediction deviation problem caused by the neglect of the coupling environment of plateau and desert in traditional models. Based on the physical characteristics of the specific sealing structure of GIS, it avoids the generality defects of empirical formulas and significantly improves the fit between life prediction results and actual service conditions.

[0024] 3. The full life design method of this invention constructs a quantitative evaluation system for sealing performance throughout the entire life cycle. Through the system process of "parameter input - stress calculation - attenuation correction - closed-loop judgment", it realizes the dynamic evolution tracking of sealing contact stress. It not only outputs accurate predicted service life, but also calculates the service life safety margin, providing a quantitative basis for the performance changes of GIS sealing structures throughout the entire life cycle, filling the gap in the existing technology that cannot achieve dynamic evaluation.

[0025] 4. The full life-cycle design method of this invention directly supports the engineering optimization and scientific selection of sealing structures. It can quickly iteratively verify the design schemes of different sealing groove types and sealing ring compression amounts, and guide the functional division design of main and auxiliary seals. At the same time, it supports the comparative analysis of the lifespan of multiple types of sealing materials, providing scientific support for material selection in plateau and desert environments, and improving the design rationality and reliability of GIS sealing structures from the source.

[0026] 5. The whole life design method of this invention has strong versatility and engineering implementation capability. It realizes the engineering application of physical-parameter model through standardized algorithm process, which is convenient for software development and promotion. The prediction system can be extended to the sealing life assessment of other high-voltage electrical equipment such as circuit breakers and transformers, forming a reusable and scalable sealing reliability assessment technology system. It has broad engineering application value and provides a scalable engineering method for UHV GIS sealing design. Attached Figure Description

[0027] Figure 1 This is a structural diagram of an 800kV GIS device suitable for plateau desert environments provided in the embodiments of this application.

[0028] Figure 2 This is a schematic diagram of the main and auxiliary double-sealed structure of an 800kV GIS equipment suitable for plateau and desert environments, provided in the embodiments of this application.

[0029] Figure 3 This is a schematic diagram of the main and auxiliary double-sealed structure of an 800kV GIS equipment suitable for plateau and desert environments provided in this application embodiment, in a state where the connection is not tight.

[0030] Figure 4This is a schematic diagram of the main and auxiliary dual-sealed structure of an 800kV GIS equipment suitable for plateau and desert environments provided in this application embodiment, with the sealing ring removed.

[0031] Figure 5 This is a flowchart of a sealing life prediction system for a dual-sealing structure with main and auxiliary functions for 800kV GIS equipment suitable for plateau and desert environments, provided in an embodiment of this application.

[0032] Wherein: GIS shell 1; flange 2; Flange 1 21; convex ring 1 211; convex ring 2 212; sealing groove 1 213; Flange 22; Annular groove 1 221; Sealing groove 2 222; Annular groove 2 223; Sealing ring 1 (3); Sealing ring 2 (4). Detailed Implementation

[0033] The present invention will now be described in further detail with reference to specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose. Example 1

[0034] Please see Figure 1-5 In this embodiment, an 800kV GIS main and auxiliary dual-sealing structure suitable for plateau desert environments is provided, including a GIS equipment shell 1 and a flange 2. The flange 2 is integrally provided at the connection end of the GIS shell 1. The flange 2 is provided at the connection part of the flange 2, and a main sealing structure and an auxiliary sealing structure are provided. The main sealing structure is located on the side close to the air chamber formed by the GIS shell, and the auxiliary sealing structure is located on the side close to the external environment. The main sealing structure includes flange 21, flange 22 and sealing ring 4. An integral convex ring 212 is provided at the end of flange 21 near the central axis. An annular groove 223 that mates with convex ring 212 is provided at the end of flange 22 near the central axis. Sealing ring 4 is provided in the annular groove 223.

[0035] The main sealing structure is primarily responsible for the gas sealing function of SF6 gas. Through the convex ring 212 and the annular groove 223 that cooperates with it, the sealing ring 4 forms a stable composite compression state after assembly, so as to adapt to the low pressure environment.

[0036] The auxiliary sealing structure includes flange 21, flange 22, and sealing ring 3. Flange 21 has an integral convex ring 211 at its end, which is located outside convex ring 212. A sealing groove 213 is formed at the end of convex ring 211. An annular groove 221 that mates with convex ring 211 is formed at the end of flange 22. A sealing groove 222 that mates with sealing groove 213 is formed in annular groove 221. Sealing ring 3 is set in sealing groove 213 and sealing groove 222.

[0037] The auxiliary sealing structure, consisting of a convex ring 211, annular groove 221, annular groove 221, and sealing groove 222, is used to prevent external moisture, dust, and sand from entering the main sealing area after the sealing ring 3 is assembled, thereby reducing the impact of the external environment on the main seal.

[0038] Sealing ring 1 (3) is a nitrile rubber O-ring or a silicone rubber O-ring, and sealing ring 2 (4) is a fluororubber ring or a hydrogenated nitrile rubber ring with low compression set.

[0039] A life-cycle design method for an 800kV GIS main and auxiliary dual-sealed structure suitable for plateau and desert environments, characterized by the following steps: (1) A sealing life prediction system based on sealing contact stress attenuation is constructed, including a structural parameter acquisition unit, an environmental parameter acquisition unit, a contact stress calculation unit, a stress attenuation calculation unit, a life determination unit, and a life output unit; each unit of the constructed prediction system operates in a closed-loop logic of "parameter input → stress calculation → attenuation correction → life determination → result output", as follows: Structural parameter acquisition unit: used to collect the core structural and material parameters of the GIS main seal, including the initial compression of the sealing ring, the sealing ring size parameters, the sealing groove structural parameters (groove width, groove depth, fillet radius, etc.), and the elastic modulus and aging characteristics of the sealing material; the above parameters are obtained through structural design drawings, material selection manuals or laboratory tests.

[0040] Environmental parameter acquisition unit: used to collect operating parameters of the plateau desert environment, including operating environment air pressure parameters, equivalent electric field strength of the sealed area, temperature and temperature cycle operating parameters (annual temperature difference, daily temperature difference, cycle frequency, etc.); the above parameters are obtained through environmental monitoring stations, electric field simulation calculations or on-site operating condition statistics.

[0041] Contact stress calculation unit: Based on the input of the structural parameter acquisition unit, combined with the theory of elasticity and sealing assembly simulation, the initial contact stress of the sealing ring in the assembled state is calculated. The core considerations are the elastic properties of the sealing material and the assembly and compression state of the sealing structure.

[0042] Stress attenuation calculation unit: Based on the initial contact stress, the constitutive laws of material aging and stress relaxation are introduced, and coupled correction factors of plateau desert environment are combined to construct a contact stress attenuation evolution model over time, and calculate the sealing contact stress at any time.

[0043] Lifespan determination unit: compares the real-time contact stress with the environmentally corrected critical sealing stress and executes the determination logic: if the contact stress is less than or equal to the critical sealing stress, the seal is determined to have reached the end of its lifespan; if not, it returns to the stress decay calculation unit to continue iterative calculation.

[0044] Lifetime Output Unit: Based on the results of the lifetime determination unit, outputs the predicted lifetime of the GIS main seal, and calculates the seal lifetime safety margin to provide a quantitative basis for engineering applications; (2) The initial compression of the sealing ring, the structural parameters of the sealing groove, the elastic modulus and aging characteristics of the sealing material are collected by the structural parameter acquisition unit; the operating environment air pressure, equivalent electric field strength of the sealing area, temperature and temperature cycle conditions of the plateau desert are collected by the environmental parameter acquisition unit. A seal life prediction system based on seal contact stress attenuation. (3) The contact stress calculation unit calculates the initial contact stress of the sealing ring based on the theory of elasticity and the sealing assembly state. ; (4) Stress attenuation calculation unit constructs contact stress evolution relationship Furthermore, low-pressure correction, electric field correction, and temperature correction were introduced to obtain a contact stress attenuation model under the coupled environment of plateau and desert. (5) The lifespan determination unit will Contact stress at any moment Critical sealing stress after low-pressure correction In comparison, if ≤ If the seal reaches the end of its lifespan, the time at which this occurs is recorded as the predicted lifespan. ;like If the seal has not reached the end of its lifespan, then the time step will be used. Iterative calculations are performed until the criterion is met; (6) The life output unit outputs the predicted lifespan and the safety margin of the sealing life, which is used for the design optimization and operation and maintenance support of GIS sealing structures.

[0045] The determination logic of the life determination unit is a closed-loop iterative logic: if the contact stress does not reach the critical stress, it returns to the stress attenuation calculation unit to continue the calculation; if the critical stress is reached, it triggers the life output unit to output the result.

[0046] The composite prediction model is a combination of a physical-parameter model based on the specific sealing structure of GIS and a system model implemented using a system algorithm process; the attenuation function This paper comprehensively reflects the coupled effects of sealing material aging, stress relaxation, and the high-altitude desert environment, and corrects for these effects with electric field acceleration coefficients and temperature cycling acceleration coefficients, resulting in an exponential decay model.

[0047] in, This is the material aging rate coefficient. This is the stress relaxation rate coefficient.

[0048] The low pressure correction is achieved through a pressure correction coefficient. Correcting the critical sealing stress; the electric field is corrected to pass through Corrected decay function; the temperature correction is achieved through Correct the decay function.

[0049] The prediction results are used to guide the functional division design of the main seal and auxiliary seal, optimize the sealing groove type and sealing ring compression parameters, compare sealing material schemes, and determine the design life and safety margin of the sealing structure.

[0050] Initial contact stress between the sealing ring and the sealing surface after assembly The calculation formula is:

[0051] in, For the elastic modulus of the sealing material, The initial compression ratio of the sealing ring. The correction factor for the sealing groove structure (determined by the ratio of groove width to groove depth) In the stress attenuation calculation unit, the attenuation relationship of contact stress over time is represented by the product of the initial stress and the time attenuation function. This core reflects the combined effects of material aging, stress relaxation, and environmental factors. The expression is as follows:

[0052] in: for The sealing contact stress at any given moment, in MPa; Initial contact stress during assembly, in MPa; For the overall attenuation function, 0 < ≤1, its form is obtained by fitting the material aging test and stress relaxation test.

[0053] Low-pressure correction, also known as critical stress correction, addresses the issue that low atmospheric pressure at high altitudes reduces the sealing pressure requirement for SF6 gas and alters the gas permeation characteristics of the sealing interface. The unit's atmospheric pressure is obtained through environmental parameters, and a pressure correction coefficient is calculated. Correct the critical sealing stress: ,

[0054] in, The corrected critical sealing stress. The critical stress for SF6 sealing under standard atmospheric pressure (determined by experiment). This represents the actual air pressure in the high-altitude desert. Standard atmospheric pressure (101.325 kPa) Electric field correction: The high equivalent electric field in the sealed area will accelerate the aging and degradation of the rubber material. Therefore, an electric field acceleration coefficient is introduced. Correct the decay function:

[0055] in, The electric field aging sensitivity coefficient is (fitted by electric field accelerated aging test). The equivalent electric field strength in the sealed area is expressed in kV / mm.

[0056] Temperature Correction: The intense temperature cycling in high-altitude deserts exacerbates material fatigue and performance degradation. Therefore, a temperature cycling acceleration factor is introduced. Combining the Arrhenius equation with the temperature cycle frequency correction decay function:

[0057] in, Temperature cycle frequency, This is the temperature cycling sensitivity coefficient. This represents the temperature difference during a single cycle.

[0058] After combining the three types of corrections, the final expression for contact stress attenuation is:

[0059] The corrected critical sealing stress is . Based on the predicted lifespan and the design lifespan of the GIS equipment, calculate the safety margin for the sealing life:

[0060] in, Design life of the sealing structure for GIS equipment.

[0061] The prediction system constructed in this invention comprises six functional units, each operating in a closed-loop logic of "parameter input → stress calculation → attenuation correction → lifetime determination → result output," as detailed below: Structural parameter acquisition unit: used to collect the core structural and material parameters of the GIS main seal, including the initial compression of the sealing ring, the sealing ring size parameters, the sealing groove structural parameters (groove width, groove depth, fillet radius, etc.), and the elastic modulus and aging characteristics of the sealing material; the above parameters are obtained through structural design drawings, material selection manuals or laboratory tests.

[0062] Environmental parameter acquisition unit: used to collect operating parameters of the plateau desert environment, including operating environment air pressure parameters, equivalent electric field strength of the sealed area, temperature and temperature cycle operating parameters (annual temperature difference, daily temperature difference, cycle frequency, etc.); the above parameters are obtained through environmental monitoring stations, electric field simulation calculations or on-site operating condition statistics.

[0063] Contact stress calculation unit: Based on the input of the structural parameter acquisition unit, combined with the theory of elasticity and sealing assembly simulation, the initial contact stress of the sealing ring in the assembled state is calculated. The core considerations are the elastic properties of the sealing material and the assembly and compression state of the sealing structure.

[0064] Stress attenuation calculation unit: Based on the initial contact stress, the constitutive laws of material aging and stress relaxation are introduced, and coupled correction factors of plateau desert environment are combined to construct a contact stress attenuation evolution model over time, and calculate the sealing contact stress at any time.

[0065] Lifespan determination unit: compares the real-time contact stress with the environmentally corrected critical sealing stress and executes the determination logic: if the contact stress is less than or equal to the critical sealing stress, the seal is determined to have reached the end of its lifespan; if not, it returns to the stress decay calculation unit to continue iterative calculation.

[0066] Lifetime Output Unit: Based on the results of the lifetime determination unit, outputs the predicted lifetime of the GIS main seal, and calculates the seal lifetime safety margin, providing a quantitative basis for engineering applications.

[0067] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A (800)kV GIS main and auxiliary dual-sealed structure suitable for plateau desert environments, comprising a GIS equipment housing (1) and a flange (2), characterized in that, The GIS housing (1) is integrally provided with a flange (2) at the connecting end. The flange (2) is provided with a main sealing structure and an auxiliary sealing structure at the connecting part. The main sealing structure is located on the side close to the air chamber formed by the GIS housing, and the auxiliary sealing structure is located on the side close to the external environment. The main sealing structure includes flange one (21), flange two (22) and sealing ring two (4). An integral convex ring two (212) is provided at the end of flange one (21) near the central axis. An annular groove two (223) that mates with convex ring two (212) is opened at the end of flange two (222) near the central axis. Sealing ring two (4) is provided in the annular groove two (223). The auxiliary sealing structure includes flange one (21), flange two (22) and sealing ring one (3). Flange one (21) has an integral convex ring one (211) at its end. The convex ring one (211) is located outside the convex ring two (212). A sealing groove one (213) is opened at the end of the convex ring one (211). An annular groove one (221) that mates with the convex ring one (211) is opened at the end of the flange two (22). A sealing groove two (222) that mates with the sealing groove one (213) is opened in the annular groove one (221). The sealing ring one (3) is set in the sealing groove one (213) and the sealing groove two (222).

2. The full-life design method for an 800kV GIS main and auxiliary dual-sealed structure suitable for plateau desert environments according to claim 1, characterized in that, Includes the following steps: (1) A sealing life prediction system based on sealing contact stress attenuation is constructed, including a structural parameter acquisition unit, an environmental parameter acquisition unit, a contact stress calculation unit, a stress attenuation calculation unit, a life determination unit, and a life output unit. The structural parameter acquisition unit is used to collect the structural and material parameters of the GIS main seal. The environmental parameter acquisition unit is used to collect working environmental parameters in the plateau desert. The contact stress calculation unit is used to calculate the initial contact stress of the sealing ring; The stress attenuation calculation unit is used to construct and calculate the contact stress attenuation model under coupled environment; The life determination unit is used to compare and determine the contact stress and critical stress, and to implement the iterative calculation logic; the life output unit is used to output the predicted service life and the safety margin of the sealing life. (2) The initial compression of the sealing ring, the structural parameters of the sealing groove, the elastic modulus and aging characteristics of the sealing material are collected by the structural parameter acquisition unit; the operating environment air pressure, equivalent electric field strength of the sealing area, temperature and temperature cycle conditions of the plateau desert are collected by the environmental parameter acquisition unit. A seal life prediction system based on seal contact stress attenuation. (3) The contact stress calculation unit calculates the initial contact stress of the sealing ring based on the theory of elasticity and the sealing assembly state. ; (4) Stress attenuation calculation unit constructs contact stress evolution relationship Furthermore, low-pressure correction, electric field correction, and temperature correction were introduced to obtain a contact stress attenuation model under the coupled environment of plateau and desert. (5) The lifespan determination unit will Contact stress at any moment Critical sealing stress after low-pressure correction In comparison, if ≤ If the seal reaches the end of its lifespan, the time at which this occurs is recorded as the predicted lifespan. ;like If the seal has not reached the end of its lifespan, then the time step will be used. Iterative calculations are performed until the criterion is met; (6) The life output unit outputs the predicted lifespan and the safety margin of the sealing life, which is used for the design optimization and operation and maintenance support of GIS sealing structures.

3. The 800kV GIS main and auxiliary dual-sealed structure and its full-life design method suitable for plateau desert environments according to claim 2, characterized in that, The composite prediction model is a combination of a physical-parameter model based on the specific sealing structure of GIS and a system model implemented using a system algorithm process; the attenuation function This paper comprehensively reflects the coupled effects of sealing material aging, stress relaxation, and the high-altitude desert environment, and corrects for these effects with electric field acceleration coefficients and temperature cycling acceleration coefficients, resulting in an exponential decay model. ； in, This is the material aging rate coefficient. This is the stress relaxation rate coefficient.

4. The 800kV GIS main and auxiliary dual-sealed structure and its full-life design method suitable for plateau desert environments according to claim 2, characterized in that, The low pressure correction is achieved through a pressure correction coefficient. Correct critical sealing stress; The electric field is corrected to pass through Corrected decay function; the temperature correction is achieved through Correct the decay function.

5. The 800kV GIS main and auxiliary dual-sealed structure and its full-life design method suitable for plateau desert environments according to claim 2, characterized in that, The prediction results are used to guide the functional division design of the main seal and auxiliary seal, optimize the sealing groove type and sealing ring compression parameters, compare sealing material schemes, and determine the design life and safety margin of the sealing structure.

6. The 800kV GIS main and auxiliary dual-sealed structure and its full-life design method suitable for plateau desert environments according to claim 2, characterized in that, Initial contact stress between the sealing ring and the sealing surface after assembly The calculation formula is: ； in, The elastic modulus of the sealing material, The initial compression ratio of the sealing ring. This is the correction factor for the sealing groove structure.

7. The 800kV GIS main and auxiliary dual-sealed structure and its full-life design method suitable for plateau desert environments according to claim 2, characterized in that, Low-pressure correction, also known as critical stress correction, addresses the issue that low atmospheric pressure at high altitudes reduces the sealing pressure requirement for SF6 gas and alters the gas permeation characteristics of the sealing interface. The unit's atmospheric pressure is obtained through environmental parameters, and a pressure correction coefficient is calculated. Correct the critical sealing stress: ， ； in, The corrected critical sealing stress. The critical stress for SF6 sealing under standard atmospheric pressure. This represents the actual air pressure in the high-altitude desert. Standard atmospheric pressure.

8. The 800kV GIS main and auxiliary dual-sealed structure and its full-life design method suitable for plateau desert environments according to claim 2, characterized in that the electric field Correction: The high equivalent electric field in the sealed area will accelerate the aging and degradation of the rubber material; therefore, an electric field acceleration coefficient is introduced. Correct the decay function: ； in, The electric field aging sensitivity coefficient, The equivalent electric field strength in the sealed area is expressed in kV / mm.

9. The 800kV GIS main and auxiliary dual-sealed structure and its full-life design method suitable for plateau desert environments according to claim 2, characterized in that, Temperature Correction: The intense temperature cycling in high-altitude deserts exacerbates material fatigue and performance degradation. Therefore, a temperature cycling acceleration factor is introduced. Combining the Arrhenius equation with the temperature cycle frequency correction decay function: ； in, Temperature cycle frequency, This is the temperature cycling sensitivity coefficient. This represents the temperature difference during a single cycle.

10. The 800kV GIS main and auxiliary dual-sealed structure and its full-life design method suitable for plateau desert environments according to claim 2, characterized in that, Based on the predicted lifespan and the design lifespan of the GIS equipment, calculate the safety margin for the sealing life: ； in, Design life of the sealing structure for GIS equipment.

Images