A GIS busbar state control method
By using the GIS busbar status control device, the axial stress caused by temperature changes is monitored and released in real time, which solves the problem of deformation and fracture of GIS busbars caused by temperature differences and improves the operational reliability of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHANDONG TAIKAI HIGH VOLTAGE SWITCH
- Filing Date
- 2023-05-18
- Publication Date
- 2026-06-26
AI Technical Summary
GIS busbars are prone to exceeding their yield limit in environments with large temperature variations, leading to irreversible deformation or breakage and affecting the reliable operation of the equipment.
The GIS busbar status control device monitors axial stress in real time and releases stress using expansion joints to prevent busbar deformation. This includes fixed busbar supports, transition busbar base frames, and movable busbar base frames. Expansion joints absorb displacement caused by temperature changes and release internal stress.
This effectively reduces the risk of deformation damage to the GIS busbar caused by temperature differences and improves the operational reliability of the equipment.
Smart Images
Figure CN116613685B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of GIS bus technology, specifically to a GIS bus status control method. Background Technology
[0002] As societal demands for substation operational reliability increase, the requirements for GIS (Gas Insulated Switchgear) operation are also rising. GIS busbars are significantly affected by ambient temperature during installation and operation, especially in areas with large temperature variations, where they face greater deformation challenges. In environments with extreme temperature fluctuations, if the stress caused by temperature changes severely exceeds the yield strength of the busbar casing, tearing or fracture may occur at weak points in the casing, ultimately leading to an accident.
[0003] like Figure 1 As shown, the GIS busbar 1 is fixed to the busbar base frame 2 by connecting bolts. The busbar base frame 2 and the foundation embedded parts 3 are fixed to the embedded parts inside the concrete foundation 4 by welding, thus firmly fixing the GIS busbar 1 to the concrete foundation 4, making the GIS busbar 1 and the combined electrical equipment stable. Under temperature changes, the busbar shell will shrink or expand. When the busbar is fixed, stress will be generated inside the shell, which will cause deformation of the busbar shell. In environments with small temperature differences, the busbar will not suffer damage that affects operation due to the small stress. In environments with large temperature differences, the internal stress may exceed the yield limit of the busbar, causing irreversible deformation or even fracture, completely affecting the reliable operation of the equipment. Due to different operating environments, the busbar will have some degree of deformation. Because the deformation is microscopic and does not fundamentally affect the operation of the equipment, it may not be detected or taken seriously. However, due to the different daily temperature differences, the accumulation over time may cause fatigue damage.
[0004] Therefore, how to reduce deformation damage to GIS busbars and effectively protect them is a technical problem that urgently needs to be solved in this field. Summary of the Invention
[0005] In order to solve the above-mentioned technical problems, this application proposes the following technical solution:
[0006] In a first aspect, embodiments of this application provide a GIS busbar status control method, the method comprising:
[0007] Set the GIS busbar in the GIS busbar status control device;
[0008] Determine the axial stress of the GIS busbar under temperature difference changes;
[0009] The degree of deformation of the GIS busbar is determined based on the axial stress and the material yield strength of the GIS busbar.
[0010] The control device is used to protect the GIS busbar.
[0011] In one possible implementation, determining the axial stress of the GIS busbar under temperature difference changes includes:
[0012] The expansion and contraction parameters of the GIS busbar were determined under preset extreme high and low temperature conditions, respectively.
[0013] Then determine the frictional force and gas force of the GIS busbar;
[0014] The resultant force on the GIS busbar is determined based on the frictional force and gas force of the GIS busbar.
[0015] The axial stress of the GIS busbar under preset extreme high temperature and extreme low temperature conditions is determined by combining the resultant force on the GIS busbar, the expansion parameters and contraction parameters of the GIS busbar.
[0016] In one possible implementation, determining the expansion parameters of the GIS busbar under a preset extreme high temperature condition includes: determining the expansion amount of the busbar shell at the extreme high temperature as: ΔL1=(λ1-λ2)(t max -t0)l, at the extreme high temperature, the linear strain of the busbar shell is: ε1=(λ1-λ2)(t max -t0), the axial expansion stress of the busbar shell at the extreme high temperature is: σ1=E(λ1-λ2)(t max -t0), the cross-sectional area of the busbar cylinder is S=0.25π(D 2 -d 2 The axial expansion force of the busbar shell at extreme high temperatures is: F1=σ1S=0.25πE(λ1-λ2)(t max -t0)(D 2 -d 2 ), where: λ1 is the linear expansion coefficient of the busbar, λ2 is the expansion coefficient of the base line, and t max t0 is the extreme high temperature, l is the distance between the two fixed points of the busbar, E is the elastic modulus of the busbar shell, D is the outer diameter of the busbar cylinder, and d is the inner diameter of the busbar cylinder.
[0017] In one possible implementation, determining the shrinkage parameters of the GIS busbar under a preset extreme low temperature condition includes: determining the busbar shell shrinkage amount at the extreme low temperature as: ΔL2=(λ1-λ2)(t0-t min At the extreme low temperature, the linear strain of the busbar shell is: ε2=(λ1-λ2)(t0-tmin At extreme low temperatures, the axial shrinkage stress of the busbar shell is: σ2=E(λ1-λ2)(t0-t min The axial contraction force of the busbar shell at extreme low temperatures is: F2=σ2S=0.25πE(λ1-λ2)(t0-t min (D) 2 -d 2 ), t min It is the lowest possible temperature.
[0018] In one possible implementation, the frictional force and gas force of the GIS busbar are determined, including: the busbar shell support and the base frame are connected by bolts, and the tightening torque of each bolt is determined to be: T = 0.2F. y d and the preload of each bolt are: F y =5T / d l Then the frictional force between the two generatrices is: F m =nμF y =5Tnμ / d l ;
[0019] The gas force in the busbar cylinder is: F q =P×S g =P×π×(0.5d) 2 =0.25πPd 2 ; where d l Where n is the nominal diameter of the connecting bolts, n is the number of fastening bolts between the fixed busbars and the base frame, μ is the coefficient of friction, P is the gas pressure in the busbar air chamber, and S is the nominal diameter of the connecting bolts. g This represents the stress-bearing area of the busbar end cap.
[0020] In one possible implementation, the resultant force on the GIS busbar is determined based on the frictional force and the gas force on the GIS busbar, including:
[0021] The net force on the busbar at the preset extreme high temperature is determined to be: F z1 =F1+F q -F m =0.25πE(λ1-λ2)(t max -t0)(D 2 -d 2 )-0.25πPd 2 -5Tnμ / d l ;
[0022] The net force on the busbar at the extreme low temperature is determined to be: F z2 =F2-F q -F m =0.25πE(λ1-λ2)(t0-t min (D) 2 -d2 )-0.25πPd 2 -5Tnμ / d l .
[0023] In one possible implementation, determining the axial stress of the GIS busbar under preset extreme high and low temperature conditions by combining the resultant force on the GIS busbar, the expansion parameters and contraction parameters of the GIS busbar, includes:
[0024] Determine the axial stress σ of the busbar at the extreme high temperature. z1 =F z1 / S=[0.25πE(λ1-λ2)(t max -t0)(D 2 -d 2 )-0.25πPd 2 -5Tnμ / d l ] / [0.25π(D 2 -d 2 )];
[0025] The axial stress of the busbar at the extreme low temperature is determined to be: σ z2 =F z2 / S=[0.25πE(λ1-λ2)(t0-t min (D) 2 -d 2 )-0.25πPd 2 -5Tnμ / d l ] / [0.25π(D 2 -d 2 )).
[0026] In one possible implementation, determining the degree of deformation of the GIS busbar based on the axial stress and the material yield strength of the GIS busbar includes:
[0027] The first yield strength σ of the material is determined based on the busbar material. s Second yield strength σ b ;
[0028] If σ z1 and σ z2 Less than σ s If the combined stress deformation caused by the temperature difference is elastic deformation, the busbar shell is in normal condition.
[0029] If σ z1 and σ z2 Greater than σ s And less than σ bIf the combined stress deformation caused by the temperature difference is plastic deformation, the busbar shell has undergone micro-deformation, and the failure is in the initial stage. Observation and tracking should be carried out to avoid the possible tearing or breakage of the busbar due to long-term fatigue failure.
[0030] If σ z1 and σ z2 Greater than σ b The combined stress caused by the temperature difference then exceeds the plastic deformation stage, and the busbar...
[0031] When the casing deformation enters a stage of rapid change, observe whether there is any gas leakage inside the busbar and take immediate measures to prevent equipment leakage.
[0032] In one possible implementation, the GIS busbar status control device includes: fixed busbar supports respectively disposed at both ends, a transition busbar base frame and a movable busbar base frame disposed between the fixed busbar supports, wherein the fixed busbar supports, the transition busbar base frame and the movable busbar base frame are disposed within a concrete foundation;
[0033] The fixed busbar support is provided with a first fixed busbar and a second fixed busbar respectively, and the outer flanges of the first fixed busbar and the second fixed busbar are fitted with cover plates; the transition busbar base frame and the movable busbar base frame are provided with a transition busbar and a movable busbar respectively, and the busbars are filled with gas; an expansion joint is provided between the first fixed busbar and the movable busbar, and the two ends of the expansion joint are fixedly connected to the first fixed busbar and the movable busbar respectively.
[0034] In one possible implementation, the protection of the GIS busbar via the control device includes:
[0035] Determine the installation temperature of the GIS busbar status control device;
[0036] When the temperature rises, the busbar shell expands, which compresses the disc spring inside the expansion joint flange and releases the expansion stress. At the same time, since the transition busbar and the movable busbar are connected by a long hole, when the expansion stress reaches the point of overcoming friction, the movable busbar and the transition busbar can slide in the long hole. The expansion stress of the movable busbar and the transition busbar is released through the change of displacement.
[0037] or,
[0038] When the temperature drops, the busbar shell contracts, causing the outer disc spring of the expansion joint flange to compress and thus release the contraction stress. At the same time, since the transition busbar and the movable busbar are connected by a long hole, when the contraction stress reaches the point of overcoming friction, the movable busbar and the transition busbar can slide within the long hole. The contraction stress of the movable busbar and the transition busbar can be released through the change of displacement.
[0039] In this embodiment, based on the actual operating environment of the GIS busbar, the axial stress of the GIS busbar under temperature difference changes is tracked to determine potential temperature change defects of the busbar. A GIS busbar status control device is used to control the status of the GIS busbar, thereby reducing the risk of component damage caused by deformation of the GIS busbar. Attached Figure Description
[0040] Figure 1 This is a schematic diagram of the fixed structure of a traditional GIS busbar.
[0041] Figure 2 A flowchart illustrating a GIS busbar status control method provided in this application embodiment;
[0042] Figure 3 This is a schematic diagram of the structure of the GIS busbar status control device provided in the embodiments of this application;
[0043] Figures 1-3 In Chinese, the symbol is represented as:
[0044] 1-GIS busbar, 2-busbar base frame, 3-foundation embedded parts, 4-concrete foundation, 5-fixed busbar support, 6-transition busbar base frame, 7-movable busbar base frame, 8-first fixed busbar, 9-second fixed busbar, 10-cover plate, 11-transition busbar, 12-movable busbar, 13-expansion joint. Detailed Implementation
[0045] The present solution will now be described in conjunction with the accompanying drawings and specific embodiments.
[0046] Figure 2 This is a flowchart illustrating a GIS bus status control method provided in an embodiment of this application. See [link / reference]. Figure 2 The GIS bus status control method in this embodiment includes:
[0047] S101, set the GIS busbar to.
[0048] See Figure 3 The GIS bus status control device provided in this application embodiment is... Figure 3 The GIS busbar status control device includes: fixed busbar supports 5 respectively installed at both ends, transition busbar base frame 6 and movable busbar base frame 7 installed between the fixed busbar supports, and the fixed busbar supports 5, transition busbar base frame 6 and movable busbar base frame 7 are installed in the concrete foundation 4.
[0049] The fixed busbar support is provided with a first fixed busbar 8 and a second fixed busbar 9 respectively, and the outer flanges of the first fixed busbar 8 and the second fixed busbar 9 are equipped with cover plates 10; the transition busbar base frame 6 and the movable busbar base frame 7 are provided with a transition busbar 11 and a movable busbar 12 respectively, and the busbars are filled with gas; an expansion joint 13 is provided between the first fixed busbar 8 and the movable busbar 7, and the two ends of the expansion joint 13 are fixedly connected to the first fixed busbar 8 and the movable busbar 7 respectively.
[0050] The GIS busbars are installed on the GIS busbar status control device. The installation method is as follows: fixed busbars are installed at both ends, and expansion joints, movable busbars, and transition busbars are installed between the two fixed busbars. The bottom bend plates of the fixed busbars are bolted to the fixed busbar base frame. The bolt connection between the two is a circular hole connection, meaning that both the busbar bend plate support and the fixed busbar base frame have circular holes of the same diameter as the bolts. There is no relative sliding displacement between them; it is a fixed connection. The bottom bend plate support of the movable busbar is bolted to the movable busbar base frame. The bottom of the movable busbar bend plate support has circular holes of the same diameter as the bolts. The mounting holes on the movable busbar base frame are elongated holes. After the movable busbar and the movable busbar base frame are bolted, the movable busbar can move along the length of the elongated hole against friction. The transition busbar is also bolted to the transition busbar base frame with elongated holes, and the transition busbar can move along the length of the elongated hole against friction. The expansion joint connects to the fixed or movable busbar only via flanges, without bottom support. It is freely expandable and contractible, absorbing displacement caused by external temperature changes while releasing internal stress to prevent damage to the fixed busbar. The expansion joint consists of a bellows, screws, disc spring sleeves, flat washers, spring washers, thin nuts, disc spring assemblies, and thick nuts. The bellows has connecting flanges on both sides, with an expansion bellows welded between them. Four screws pass through the bellows flanges. One end of the left flange is fitted with a flat washer, spring washer, thin nut, and thick nut, while the other end only has a flat washer and thick nut. Disc spring assemblies are installed at both ends of the right bellows flange, each fitting onto the screws. Flat washers are pressed onto both ends of the disc spring assemblies, which are then tightened with thick nuts. The preload and free expansion / contraction of the disc springs are controlled by adjusting the pressure exerted by the nuts on the springs. In the disc spring assembly, two disc springs are stacked together to form one set, and each pair of stacked springs is aligned to form a mating set. Both sides of the flange have 5 sets of mating disc springs, totaling 20 disc springs to form one disc spring assembly. Each expansion joint has a total of 4 screws, and each screw has 2 sets of disc spring assemblies installed at both ends of the right flange. Each expansion joint has a total of 8 sets of disc spring assemblies.
[0051] S102, determine the axial stress of the GIS busbar under temperature difference change conditions.
[0052] In this embodiment, the expansion and contraction parameters of the GIS busbar are determined under preset extreme high and low temperature conditions. Then, the frictional force and gas force of the GIS busbar are determined, and the resultant force on the GIS busbar is determined based on these forces. Combining the resultant force on the GIS busbar with its expansion and contraction parameters, the axial stress of the GIS busbar under the preset extreme high and low temperature conditions is determined.
[0053] Determining the expansion parameters of the GIS busbar under a preset extreme high temperature condition includes: determining the expansion amount of the busbar shell at the extreme high temperature as: ΔL1=(λ1-λ2)(t max -t0)l, at the extreme high temperature, the linear strain of the busbar shell is: ε1=(λ1-λ2)(t max -t0), the axial expansion stress of the busbar shell at the extreme high temperature is: σ1=E(λ1-λ2)(t max -t0), the cross-sectional area of the busbar cylinder is S=0.25π(D 2 -d 2 The axial expansion force of the busbar shell at extreme high temperatures is: F1=σ1S=0.25πE(λ1-λ2)(t max -t0)(D 2 -d 2 ), where: λ1 is the linear expansion coefficient of the busbar, λ2 is the expansion coefficient of the base line, and t max t0 is the extreme high temperature, l is the distance between the two fixed points of the busbar, E is the elastic modulus of the busbar shell, D is the outer diameter of the busbar cylinder, and d is the inner diameter of the busbar cylinder.
[0054] Determining the shrinkage parameters of the GIS busbar under a preset extreme low temperature condition includes: determining the busbar shell shrinkage amount at the extreme low temperature as: ΔL2=(λ1-λ2)(t0-t min At the extreme low temperature, the linear strain of the busbar shell is: ε2=(λ1-λ2)(t0-t min At extreme low temperatures, the axial shrinkage stress of the busbar shell is: σ2=E(λ1-λ2)(t0-t min The axial contraction force of the busbar shell at extreme low temperatures is: F2=σ2S=0.25πE(λ1-λ2)(t0-t min (D) 2 -d 2 ), t min It is the lowest possible temperature.
[0055] Determine the frictional force and gas force of the GIS busbar, including: the connection between the busbar shell support and the base frame via bolts, and determine the tightening torque of each bolt as: T = 0.2F. y d and the preload of each bolt are: Fy =5T / d l Then the frictional force between the two generatrices is: F m =nμF y =5Tnμ / d l The gas force in the busbar cylinder is: F q =P×S g =P×π×(0.5d) 2 =0.25πPd 2 ; where d l Where n is the nominal diameter of the connecting bolts, n is the number of fastening bolts between the fixed busbars and the base frame, μ is the coefficient of friction, P is the gas pressure in the busbar air chamber, and S is the nominal diameter of the connecting bolts. g This represents the stress-bearing area of the busbar end cap.
[0056] The resultant force on the GIS busbar is determined based on the frictional force and gas force of the GIS busbar, including: determining the resultant force on the busbar at a preset extreme high temperature as F. z1 =F1+F q -F m =0.25πE(λ1-λ2)(t max -t0)(D 2 -d 2 )-0.25πPd 2 -5Tnμ / d l The net force on the busbar at the extreme low temperature is determined to be: F z2 =F2-F q -F m =0.25πE(λ1-λ2)(t0-t min (D) 2 -d 2 )-0.25πPd 2 -5Tnμ / d l .
[0057] The axial stress of the GIS busbar under preset extreme high temperature and extreme low temperature conditions is determined by combining the resultant force on the GIS busbar, the expansion parameters and contraction parameters of the GIS busbar, including: determining the axial stress σ of the busbar at the extreme high temperature. z1 =F z1 / S=[0.25πE(λ1-λ2)(t max -t0)(D 2 -d 2 )-0.25πPd 2 -5Tnμ / d l ] / [0.25π(D 2 -d 2 The axial stress of the busbar at the extreme low temperature is determined as follows:
[0058] σz2 =F z2 / S=[0.25πE(λ1-λ2)(t0-t min (D) 2 -d 2 )-0.25πPd 2 -5Tnμ / d l ] / [0.25
[0059] π(D 2 -d 2 )).
[0060] S103, determine the degree of deformation of the GIS busbar based on the axial stress and the material yield strength of the GIS busbar.
[0061] The first yield strength σ of the material is determined based on the busbar material. s Second yield strength σ b If σ z1 and σ z2 Less than σ s If the combined stress deformation caused by the temperature difference is elastic deformation, the busbar shell remains in normal condition. z1 and σ z2 Greater than σ s And less than σ b If the combined stress deformation caused by the temperature difference is plastic deformation, the busbar shell undergoes microscopic deformation, and the failure is in its initial stage. Observation and monitoring are necessary to avoid potential busbar tearing or fracture due to prolonged fatigue failure. If σ z1 and σ z2 Greater than σ b If the combined stress caused by the temperature difference exceeds the plastic deformation stage, the deformation of the busbar shell will enter a stage of rapid change. Observe whether there is any gas leakage in the busbar and take immediate measures to prevent equipment leakage.
[0062] S104, the GIS busbar is protected by the control device.
[0063] Determine the installation temperature of the GIS busbar status control device;
[0064] When the temperature rises, the fixed busbars at both ends of the device prevent movement, thus immobilizing the entire device. Due to the increased temperature, the busbar shell expands, causing the disc springs inside the expansion joint flanges to compress and release the expansion stress. Simultaneously, the transition busbar and movable busbar, connected by elongated holes, can slide within these holes when the expansion stress is sufficient to overcome friction. This displacement releases the expansion stress in the movable and transition busbars. Therefore, the presence of the expansion joints allows the fixed busbars to release stress through compression, and the movable and transition busbars can move freely to overcome friction, thus releasing the expansion force caused by the temperature rise and preventing high-temperature stress damage to the GIS busbars.
[0065] When the temperature drops, the fixed busbars at both ends of the device prevent them from moving, thus immobilizing the entire device. Due to the temperature drop, the busbar shell contracts, causing the outer disc springs of the expansion joint flange to compress and release contraction stress. Simultaneously, the transition busbar and movable busbar, connected by elongated holes, can slide within these holes when the expansion stress is sufficient to overcome friction. This displacement releases the contraction stress in the movable and transition busbars. Therefore, the presence of the expansion joint allows the fixed busbar to release stress through compression, while the movable and transition busbars can move freely overcoming friction. This stress release effect also releases the expansion force caused by the temperature rise, preventing the GIS busbar from being damaged by low-temperature stress.
[0066] In this application embodiment, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, the simultaneous existence of A and B, or the existence of B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.
[0067] The above description is merely a specific embodiment of this application. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application. The protection scope of this application should be determined by the protection scope of the claims.
Claims
1. A GIS busbar status control method, characterized in that, The method includes: The GIS busbar is installed in the GIS busbar status control device, which includes: fixed busbar supports respectively installed at both ends, a transition busbar base frame and a movable busbar base frame installed between the fixed busbar supports, and the fixed busbar supports, transition busbar base frame and movable busbar base frame are installed in a concrete foundation. The fixed busbar support is respectively provided with a first fixed busbar and a second fixed busbar, and the outer flanges of the first fixed busbar and the second fixed busbar are fitted with cover plates; the transition busbar base frame and the movable busbar base frame are respectively provided with a transition busbar and a movable busbar, and the GIS busbar is filled with gas; an expansion joint is provided between the first fixed busbar and the transition busbar, and the two ends of the expansion joint are respectively fixedly connected to the first fixed busbar and the transition busbar; Determine the axial stress of the GIS busbar under temperature difference changes, including: The expansion and contraction parameters of the GIS busbar were determined under preset extreme high and low temperature conditions, respectively. Then determine the frictional force and gas force of the GIS busbar; The resultant force on the GIS busbar is determined based on the frictional force and gas force of the GIS busbar. The axial stress of the GIS busbar under preset extreme high temperature and extreme low temperature conditions is determined by combining the resultant force on the GIS busbar, the expansion parameters and contraction parameters of the GIS busbar. The degree of deformation of the GIS busbar is determined based on the axial stress and the material yield strength of the GIS busbar, including: The first yield strength σ of the material is determined based on the busbar material. s Second yield strength σ b ; If σ z1 and σ z2 Less than σ s The combined stress deformation caused by the temperature difference is elastic deformation, the busbar shell is in normal condition, and σ z1 σ is the axial stress of the busbar at the extreme high temperature. z2 This refers to the axial stress of the busbar at extremely low temperatures. If σ z1 and σ z2 Greater than σ s And less than σ b The combined stress deformation caused by the temperature difference is then plastic deformation. The busbar shell has undergone micro-deformation, and the damage is in its initial stage. Observation and tracking should be carried out to avoid the possible tearing or breakage of the busbar due to prolonged fatigue damage. If σ z1 and σ z2 Greater than σ b The combined stress caused by the temperature difference then exceeds the plastic deformation stage, and the busbar... When the casing deformation enters a stage of rapid change, observe whether there is any gas leakage inside the busbar and take immediate measures to prevent equipment leakage. The protection of the GIS busbar is achieved through the control device, including: Determine the installation temperature of the GIS busbar status control device; When the temperature rises, the busbar shell expands, which compresses the disc spring inside the expansion joint flange and releases the expansion stress. At the same time, since the transition busbar and the movable busbar are connected by a long hole, when the expansion stress reaches the point of overcoming friction, the movable busbar and the transition busbar can slide in the long hole. The expansion stress of the movable busbar and the transition busbar is released through the change of displacement. or, When the temperature drops, the busbar shell contracts, causing the outer disc spring of the expansion joint flange to compress and thus release the contraction stress. At the same time, since the transition busbar and the movable busbar are connected by a long hole, when the contraction stress reaches the point of overcoming friction, the movable busbar and the transition busbar can slide within the long hole. The contraction stress of the movable busbar and the transition busbar can be released through the change of displacement.
2. The GIS busbar status control method according to claim 1, characterized in that, Determining the expansion parameters of the GIS busbar under a preset extreme high temperature condition includes: determining the expansion amount of the busbar shell at the extreme high temperature as: ΔL1 = (λ1 - λ2) (t max -t0)l, at the extreme high temperature, the linear strain of the busbar shell is: ε1=(λ1-λ2)(t max -t0), at the extreme high temperature, the axial expansion stress of the busbar shell is: σ1=E(λ1-λ2)(t max -t0), the cross-sectional area of the busbar cylinder is S=0.25π (D 2 -d 2 The axial expansion force of the busbar shell at extreme high temperatures is: F1 = σ1S = 0.25πE(λ1 - λ2) (t max -t0)(D 2 -d 2 ), where: λ1 is the generatrix expansion coefficient, λ2 is the base line expansion coefficient, and t max t0 is the extreme high temperature, l is the distance between the two fixed points of the busbar, E is the elastic modulus of the busbar shell, D is the outer diameter of the busbar cylinder, and d is the inner diameter of the busbar cylinder.
3. The GIS busbar status control method according to claim 2, characterized in that, Determining the shrinkage parameters of the GIS busbar under a preset extreme low temperature condition includes: determining the shrinkage amount of the busbar shell at the extreme low temperature as: ΔL2 = (λ1 - λ2) (t0 - t min At the extreme low temperature, the linear strain of the busbar shell is: ε2 = (λ1 - λ2) (t0 - t) min At extreme low temperatures, the axial shrinkage stress of the busbar shell is: σ2 = E(λ1 - λ2) (t0 - t min The axial contraction force of the busbar shell at extreme low temperatures is: F2 = σ2S = 0.25πE(λ1 - λ2) (t0 - t) min (D) 2 -d 2 ), t min It is the lowest possible temperature.
4. The GIS busbar status control method according to claim 2, characterized in that, Determine the frictional force and gas force of the GIS busbar, including: the connection between the busbar shell support and the base frame via bolts, and determine the tightening torque of each bolt as: T=0.2F. y d and the preload of each bolt are: F y =5T / d l Then the frictional force between the two generatrices is: F m =nμF y =5Tnμ / d l ; The gas force in the busbar cylinder is: F q =P×S g =P×π×(0.5d) 2 =0.25πPd 2 ; where d l Where n is the nominal diameter of the connecting bolts, n is the number of fastening bolts between the fixed busbars and the base frame, μ is the coefficient of friction, P is the gas pressure in the busbar air chamber, and S is the nominal diameter of the connecting bolts. g This represents the stress-bearing area of the busbar end cap.
5. The GIS busbar status control method according to claim 4, characterized in that, The resultant force on the GIS busbar is determined based on the frictional force and gas force of the GIS busbar, including: The net force on the busbar at the preset extreme high temperature is determined to be: F z1 =F1+F q -F m =0.25πE(λ1-λ2)(t max -t0)(D 2 -d 2 )-0.25πPd 2 -5Tnμ / d l ; The net force on the busbar at the extreme low temperature is determined to be: F z2 =F2-F q -F m =0.25πE(λ1-λ2)(t0-t min (D) 2 -d 2 )-0.25πPd 2 -5Tnμ / d l .
6. The GIS busbar status control method according to claim 5, characterized in that, The determination of the axial stress of the GIS busbar under preset extreme high and low temperature conditions by combining the resultant force on the GIS busbar, the expansion parameters and contraction parameters of the GIS busbar, includes: Determine the axial stress σ of the busbar at the extreme high temperature. z1 =F z1 / S=[0.25πE(λ1-λ2)(t max -t0)(D 2 -d 2 )-0.25πPd 2 -5Tnμ / d l ] / [0.25π(D 2 -d 2 )]; The axial stress of the busbar at the extreme low temperature is determined to be: σ z2 =F z2 / S=[0.25πE(λ1-λ2)(t0-t min (D) 2 -d 2 )-0.25πPd 2 -5Tnμ / d l ] / [0.25π(D 2 -d 2 )].