CN116613685A - GIS bus state control method - Google Patents

GIS bus state control method Download PDF

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Publication number
CN116613685A
CN116613685A CN202310560574.3A CN202310560574A CN116613685A CN 116613685 A CN116613685 A CN 116613685A CN 202310560574 A CN202310560574 A CN 202310560574A CN 116613685 A CN116613685 A CN 116613685A
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CN
China
Prior art keywords
bus
gis
sigma
temperature
determining
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Pending
Application number
CN202310560574.3A
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Chinese (zh)
Inventor
柳如见
高瑞东
李玉友
梁孝峰
邓东印
孙国强
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Shandong Taikai High Volt Switchgear Co Ltd
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Shandong Taikai High Volt Switchgear Co Ltd
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Application filed by Shandong Taikai High Volt Switchgear Co Ltd filed Critical Shandong Taikai High Volt Switchgear Co Ltd
Priority to CN202310560574.3A priority Critical patent/CN116613685A/en
Publication of CN116613685A publication Critical patent/CN116613685A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G5/00—Installations of bus-bars
    • H02G5/06—Totally-enclosed installations, e.g. in metal casings
    • H02G5/061—Tubular casings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G11/00—Arrangements of electric cables or lines between relatively-movable parts
    • H02G11/006—Arrangements of electric cables or lines between relatively-movable parts using extensible carrier for the cable, e.g. self-coiling spring
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

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  • Installation Of Bus-Bars (AREA)

Abstract

The application discloses a GIS bus state control method, which relates to the technical field of GIS buses and comprises the following steps: arranging a GIS bus in a GIS bus state control device; respectively determining the axial stress of the GIS bus in a temperature difference change state; determining the deformation degree of the GIS bus according to the axial stress and the material yield limit of the GIS bus; and the GIS bus is protected by the control device. According to the actual condition of the GIS bus operating environment, the axial stress of the GIS bus under the temperature difference change is tracked, so that potential temperature change defects of the bus are judged, the state of the GIS bus is controlled by adopting the GIS bus state control device, and the risk of component damage caused by deformation of the GIS bus is reduced.

Description

GIS bus state control method
Technical Field
The application relates to the technical field of GIS buses, in particular to a GIS bus state control method.
Background
With the improvement of the operation reliability requirements of the society on the transformer substation, the requirements on the operation of GIS (GAS INSULATED SWITCHGEAR, transformer substation combined electrical appliances) are higher and higher, the GIS bus is greatly influenced by the environmental temperature in the installation process and after the operation, and particularly the bus is subjected to larger deformation test in the area with larger temperature difference. Under the environment with extremely large temperature difference change, if the stress caused by the temperature change seriously exceeds the yield limit of the bus shell, tearing or breaking phenomenon can be caused at the weak link of the bus shell, and finally accidents are caused.
As shown in fig. 1, the GIS bus 1 is fixed on the bus chassis 2 through a connecting bolt, the bus chassis 2 and the embedded part of the foundation embedded part 3 inside the concrete foundation 4 are fixed through welding, and then the GIS bus 1 is firmly fixed on the concrete foundation 4, so that the GIS bus 1 and the combined electrical equipment are stable. Under the state of temperature change, the bus shell can generate shrinkage or expansion, and under the state of bus fixation, stress can be generated in the shell, and under the action of internal stress, the bus shell can be deformed. Under the environment with smaller temperature difference, the bus is unlikely to generate damage effect affecting operation due to smaller stress. Under the environment state of large temperature difference, internal stress can exceed the yield limit of the bus to cause irreversible deformation and even fracture, and the reliable operation of equipment is thoroughly influenced. Due to the different operating environments of the equipment, more or less buses are deformed, the operation of the equipment is not discovered or emphasized due to microscopic deformation and is not fundamentally influenced, but fatigue can be caused by time accumulation due to different daily temperature differences.
Therefore, how to reduce deformation damage of the GIS bus and effectively protect the GIS bus is a technical problem to be solved in the field.
Disclosure of Invention
In order to solve the technical problems, the application provides the following technical scheme:
in a first aspect, an embodiment of the present application provides a method for controlling a state of a GIS bus, where the method includes:
arranging a GIS bus in a GIS bus state control device;
respectively determining the axial stress of the GIS bus in a temperature difference change state;
determining the deformation degree of the GIS bus according to the axial stress and the material yield limit of the GIS bus;
and the GIS bus is protected by the control device.
In one possible implementation manner, the determining the axial stress of the GIS bus in the temperature difference change state includes:
respectively determining expansion parameters and contraction parameters of the GIS bus under the preset limit high-temperature and limit low-temperature states;
then determining the friction force of the GIS bus and the gas force of the GIS bus;
determining the resultant force born by the GIS bus according to the GIS bus friction force and the GIS bus gas force;
and determining the axial stress of the GIS bus in a preset limit high-temperature and limit low-temperature state by combining the resultant force born by the GIS bus and the expansion parameter and the contraction parameter of the GIS bus.
In one possible implementation manner, determining the expansion parameter of the GIS bus at the preset limit high temperature state includes: the expansion amount of the bus shell at the limit high temperature is respectively determined as follows: ΔL 1 ＝(λ 1 -λ 2 )(t max -t 0 ) l, bus shell line strain at the limit high temperature is: epsilon 1 ＝(λ 1 -λ 2 )(t max -t 0 ) The axial expansion stress of the bus shell at the limit high temperature is as follows: sigma (sigma) 1 ＝E(λ 1 -λ 2 )(t max -t 0 ) The bus bar cylinder cross-sectional area is s=0.25pi (D 2 -d 2 ) And the axial expansion force of the bus shell at the limit high temperature is as follows: f (F) 1 ＝σ 1 S＝0.25πE(λ 1 -λ 2 )(t max -t 0 )(D 2 -d 2 ) Wherein: lambda (lambda) 1 Lambda is the linear expansion coefficient of bus bar 2 Based on the linear expansion coefficient, t max Is at the extreme high temperature, t 0 For installing the ambient temperature, l is the distance between two fixed points of the bus, E is the bus shellThe elastic modulus, D is the outer diameter of the bus cylinder, and D is the inner diameter of the bus cylinder.
In one possible implementation manner, determining the shrinkage parameter of the GIS bus under the preset limit low-temperature state includes: the shrinkage of the bus shell at the limit low temperature is respectively determined as follows: ΔL 2 ＝(λ 1 -λ 2 )(t 0 -t min ) l, bus shell line strain at extreme low temperature is: epsilon 2 ＝(λ 1 -λ 2 )(t 0 -t min ) The axial shrinkage stress of the bus shell at the extreme low temperature is as follows: sigma (sigma) 2 ＝E(λ 1 -λ 2 )(t 0 -t min ) And the axial shrinkage force of the bus shell at the extreme low temperature is as follows: f (F) 2 ＝σ 2 S＝0.25πE(λ 1 -λ 2 )(t 0 -t min )(D 2 -d 2 )，t min Is at a very low temperature.
In one possible implementation, determining the GIS bus friction and GIS bus gas force includes: the bus shell support is connected with the chassis through bolts, and each bolt fastening moment is determined to be: t=0.2f y d and the pretightening force of each bolt is as follows: f (F) y ＝5T/d l The friction between the two bus bars is: f (F) m ＝nμF y ＝5Tnμ/d l ；
The gas force of the bus barrel is as follows: f (F) q ＝P×S g ＝P×π×(0.5d) 2 ＝0.25πPd 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein d l For the nominal diameter of the connecting bolts, n is the number of fastening bolts for fixing the bus and the underframe between the buses, mu is the friction coefficient, P is the gas pressure of the bus gas chamber, S g Is the bearing area of the bus end cover.
In one possible implementation, determining the resultant force suffered by the GIS bus according to the GIS bus friction force and the GIS bus gas force includes:
the resultant force born by the bus when the preset limit high temperature is determined is as follows: f (F) z1 ＝F 1 +F q -F m ＝0.25πE(λ 1 -λ 2 )(t max -t 0 )(D 2 -d 2 )－0.25πPd 2 －5Tnμ/d l ；
The resultant force born by the bus at the limit low temperature is determined as follows: f (F) z2 ＝F 2 -F q -F m ＝0.25πE(λ 1 -λ 2 )(t 0 -t min )(D 2 -d 2 )－0.25πPd 2 －5Tnμ/d l 。
In one possible implementation manner, the determining, by combining the resultant force born by the GIS bus and the expansion parameter and the contraction parameter of the GIS bus, the axial stress of the GIS bus in the preset limit high-temperature and limit low-temperature state includes:
determining bus axial stress sigma at a high temperature limit z1 ＝F z1 /S＝[0.25πE(λ 1 -λ 2 )(t max -t 0 )(D 2 -d 2 )－0.25πPd 2 －5Tnμ/d l ]/[0.25π(D 2 -d 2 )]；
The bus axial stress at the limit low temperature is determined as follows: sigma (sigma) z2 ＝F z2 /S＝[0.25πE(λ 1 -λ 2 )(t 0 -t min )(D 2 -d 2 )－0.25πPd 2 －5Tnμ/d l ]/[0.25π(D 2 -d 2 )]。
In one possible implementation manner, the determining the deformation degree of the GIS bus according to the axial stress and the material yield limit of the GIS bus includes:
determining a first yield limit sigma of a material according to a bus material s And a second yield limit sigma b ；
If sigma z1 Sum sigma z2 Less than sigma s The comprehensive stress caused by the temperature difference is deformed into elastic deformation, and the state of the bus shell is normal;
if sigma z1 Sum sigma z2 Greater than sigma s And is less than sigma b The comprehensive stress deformation caused by the temperature difference is plastic deformation, the busbar shell is subjected to microscopic deformation, the damage is in the initial stage, and the busbar tearing or breakage possibly caused by long-time fatigue damage is avoided by observation and tracking;
if sigma z1 Sum sigma z2 Greater than sigma b The comprehensive stress caused by the temperature difference passes through the plastic deformation stage and the bus
And the shell is deformed into a rapid change stage, whether the gas in the bus is leaked or not is observed, and measures are immediately taken to avoid the equipment leakage.
In one possible implementation manner, the GIS bus state control device includes: the fixed bus brackets are respectively arranged at two ends, the transition bus chassis and the movable bus chassis are arranged between the fixed bus brackets, and the fixed bus brackets, the transition bus chassis and the movable bus chassis are arranged in the concrete foundation;
the fixed bus bracket is provided with a first fixed bus and a second fixed bus respectively, and the outer side flanges of the first fixed bus and the second fixed bus are provided with cover plates; the transition bus chassis and the movable bus chassis are respectively provided with a transition bus and a movable bus, and the buses are filled with gas; an expansion joint is arranged between the first fixed bus and the movable bus, and two ends of the expansion joint are respectively and fixedly connected with the first fixed bus and the movable bus.
In one possible implementation manner, the protection of the GIS bus by the control device includes:
determining the installation temperature of the GIS bus state control device;
when the temperature rises, the bus shell expands, so that the disc springs at the inner sides of the expansion joint flanges are compressed, and then the expansion stress is released, meanwhile, the transition bus and the movable bus are connected through the strip holes, and under the condition that the expansion stress overcomes the friction force, the movable bus and the transition bus can slide in the strip holes, and the expansion stress of the movable bus and the transition bus is released through the change of displacement;
or alternatively, the process may be performed,
when the temperature drops, the bus shell contracts, so that the compression stress of the disc springs at the outer sides of the telescopic joint flanges is released, meanwhile, the transition bus and the movable bus are connected through the long strip holes, the movable bus and the transition bus can slide in the long strip holes under the condition that the contraction stress overcomes friction force, and the contraction stress of the movable bus and the transition bus can be released through the change of displacement.
In the embodiment of the application, the axial stress of the GIS bus under the temperature difference change is tracked according to the actual condition of the GIS bus running environment, so that the potential temperature change defect of the bus is judged, and the state of the GIS bus is controlled by adopting the GIS bus state control device, so that the risk of damage to components caused by deformation of the GIS bus is reduced.
Drawings
FIG. 1 is a schematic diagram of a conventional GIS bus fixing structure;
fig. 2 is a schematic flow chart of a GIS bus state control method according to an embodiment of the present application;
fig. 3 is a structural view of a device for controlling the state of a GIS bus according to an embodiment of the present application;
in fig. 1-3, the symbols are represented as:
the bus comprises a 1-GIS bus, a 2-bus chassis, a 3-foundation embedded part, a 4-concrete foundation, a 5-fixed bus support, a 6-transition bus chassis, a 7-movable bus chassis, an 8-first fixed bus, a 9-second fixed bus, a 10-cover plate, an 11-transition bus, a 12-movable bus and a 13-expansion joint.
Detailed Description
The present application is described below with reference to the drawings and the detailed description.
Fig. 2 is a flow chart of a GIS bus state control method according to an embodiment of the present application, referring to fig. 2, the GIS bus state control method in this embodiment includes:
s101, arranging a GIS bus in the system.
Referring to fig. 3, in fig. 3, a GIS bus state control device according to an embodiment of the present application includes: the fixed bus brackets 5 are respectively arranged at two ends, the transition bus chassis 6 and the movable bus chassis 7 are arranged between the fixed bus brackets, and the fixed bus brackets 5, the transition bus chassis 6 and the movable bus chassis 7 are arranged in the concrete foundation 4;
the fixed bus bracket is provided with a first fixed bus 8 and a second fixed bus 9 respectively, and the outer side flanges of the first fixed bus 8 and the second fixed bus 9 are provided with a cover plate 10; a transition bus 11 and a movable bus 12 are respectively arranged on the transition bus chassis 6 and the movable bus chassis 7, and gas is filled in the buses; an expansion joint 13 is arranged between the first fixed bus 8 and the movable bus 7, and two ends of the expansion joint 13 are respectively fixedly connected with the first fixed bus 8 and the movable bus 7.
The GIS bus is arranged on the GIS bus state control device, and the arrangement method comprises the following steps: the two ends are provided with fixed buses, and an expansion joint, a movable bus and a transition bus are arranged between the two fixed buses. The fixed bus bottom bent plate is arranged on the fixed bus chassis through bolts, wherein the bolt connection of the fixed bus bottom bent plate and the fixed bus chassis is round hole connection, namely round holes with the same size as the diameter of the bolts are formed in the bus bent plate support and the fixed bus chassis, and the fixed bus bottom bent plate and the fixed bus chassis are not in relative sliding displacement and are in dead connection. The movable bus bottom bent plate support is mounted on the movable bus chassis through bolts, round holes with the diameter of the bolts are formed in the bottom of the movable bus bent plate support, the mounting holes in the movable bus chassis are long-strip holes, and after the bolts are mounted on the movable bus and the movable bus chassis, the movable bus can move in the length direction of the long-strip holes under the action of friction force. The transition bus is also connected with the transition bus underframe through a long-strip hole bolt, and the transition bus can move along the long-strip hole direction under the action of overcoming friction force. The expansion joint is connected with the fixed bus or the movable bus only through a flange, and a bottom support is not arranged; the telescopic joint can be freely telescopic, can absorb displacement caused by external temperature difference change, simultaneously releases internal stress, and avoids damage of the fixed bus. The expansion joint consists of a corrugated pipe, a screw rod, a disc spring cylinder, a flat washer, a spring washer, a thin nut, a disc spring combination and a thick nut. The two sides of the corrugated pipe are provided with connecting flanges, a telescopic wave is welded between the two flanges, 4 screw rods penetrate through the corrugated pipe flanges, one end of the left flange is provided with a flat gasket, a spring gasket, a thin nut and a thick nut, and the other end is provided with only the flat gasket and the thick nut; the two ends of the right bellows flange are provided with disc spring combinations, the disc spring combinations are sleeved on the screw rods, the two ends of each disc spring combination are provided with flat washers in a pressure equalizing mode, the outer parts of the disc spring combinations are tightly clamped by thick nuts, and the pretightening force and the free expansion amount of the disc springs are set through the control adjustment of the pressing of the disc springs by the nuts; in the disc spring combination, two disc springs are overlapped into 1 group, and each two groups of overlapped openings are overlapped into 1 group. The flange both sides are 5 sets of involutions, and totally 20 dish spring make up 1 dish spring combination, and every telescopic joint totally 4 screw rods, and 2 dish spring combinations are installed at right side flange both ends to every screw rod, and 1 telescopic joint totally 8 dish spring combinations.
S102, respectively determining the axial stress of the GIS bus in the temperature difference change state.
In this embodiment, the expansion parameter and the contraction parameter of the GIS bus are determined in a preset limit high-temperature and limit low-temperature state, respectively. And then determining the friction force of the GIS bus and the gas force of the GIS bus, and determining the resultant force born by the GIS bus according to the friction force of the GIS bus and the gas force of the GIS bus. And determining the axial stress of the GIS bus in a preset limit high-temperature and limit low-temperature state by combining the resultant force born by the GIS bus and the expansion parameter and the contraction parameter of the GIS bus.
Wherein, confirm the expansion parameter of GIS generating line under the high temperature state of preset limit, include: the expansion amount of the bus shell at the limit high temperature is respectively determined as follows: ΔL 1 ＝(λ 1 -λ 2 )(t max -t 0 ) l, bus shell line strain at the limit high temperature is: epsilon 1 ＝(λ 1 -λ 2 )(t max -t 0 ) The axial expansion stress of the bus shell at the limit high temperature is as follows: sigma (sigma) 1 ＝E(λ 1 -λ 2 )(t max -t 0 ) The bus bar cylinder cross-sectional area is s=0.25pi (D 2 -d 2 ) And the axial expansion force of the bus shell at the limit high temperature is as follows: f (F) 1 ＝σ 1 S＝0.25πE(λ 1 -λ 2 )(t max -t 0 )(D 2 -d 2 ) Wherein: lambda (lambda) 1 Lambda is the linear expansion coefficient of bus bar 2 Based on the linear expansion coefficient, t max Is at the extreme high temperature, t 0 For installing the ambient temperature, l is the distance between two fixed points of the bus, E is the elastic modulus of the bus shell, D is the outer diameter of the bus cylinder, and D is the busThe inner diameter of the wire cylinder body.
Determining the shrinkage parameters of the GIS bus in a preset limit low-temperature state comprises the following steps: the shrinkage of the bus shell at the limit low temperature is respectively determined as follows: ΔL 2 ＝(λ 1 -λ 2 )(t 0 -t min ) l, bus shell line strain at extreme low temperature is: epsilon 2 ＝(λ 1 -λ 2 )(t 0 -t min ) The axial shrinkage stress of the bus shell at the extreme low temperature is as follows: sigma (sigma) 2 ＝E(λ 1 -λ 2 )(t 0 -t min ) And the axial shrinkage force of the bus shell at the extreme low temperature is as follows: f (F) 2 ＝σ 2 S＝0.25πE(λ 1 -λ 2 )(t 0 -t min )(D 2 -d 2 )，t min Is at a very low temperature.
Determining a GIS busbar friction and a GIS busbar gas force, comprising: the bus shell support is connected with the chassis through bolts, and each bolt fastening moment is determined to be: t=0.2f y d and the pretightening force of each bolt is as follows: f (F) y ＝5T/d l The friction between the two bus bars is: f (F) m ＝nμF y ＝5Tnμ/d l . The gas force of the bus barrel is as follows: f (F) q ＝P×S g ＝P×π×(0.5d) 2 ＝0.25πPd 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein d l For the nominal diameter of the connecting bolts, n is the number of fastening bolts for fixing the bus and the underframe between the buses, mu is the friction coefficient, P is the gas pressure of the bus gas chamber, S g Is the bearing area of the bus end cover.
Determining the resultant force born by the GIS bus according to the GIS bus friction force and the GIS bus gas force, comprising: the resultant force born by the bus when the preset limit high temperature is determined is as follows: f (F) z1 ＝F 1 +F q -F m ＝0.25πE(λ 1 -λ 2 )(t max -t 0 )(D 2 -d 2 )－0.25πPd 2 －5Tnμ/d l . The resultant force born by the bus at the limit low temperature is determined as follows: f (F) z2 ＝F 2 -F q -F m ＝0.25πE(λ 1 -λ 2 )(t 0 -t min )(D 2 -d 2 )－0.25πPd 2 －5Tnμ/d l 。
And determining the axial stress of the GIS bus in a preset limit high-temperature and limit low-temperature state by combining the resultant force born by the GIS bus and the expansion parameter and the contraction parameter of the GIS bus, wherein the method comprises the following steps: determining bus axial stress sigma at a high temperature limit z1 ＝F z1 /S＝[0.25πE(λ 1 -λ 2 )(t max -t 0 )(D 2 -d 2 )－0.25πPd 2 －5Tnμ/d l ]/[0.25π(D 2 -d 2 )]. The bus axial stress at the limit low temperature is determined as follows:
σ z2 ＝F z2 /S＝[0.25πE(λ 1 -λ 2 )(t 0 -t min )(D 2 -d 2 )－0.25πPd 2 －5Tnμ/d l ]/[0.25
π(D 2 -d 2 )]。
s103, determining the deformation degree of the GIS bus according to the axial stress and the material yield limit of the GIS bus.
Determining a first yield limit sigma of a material according to a bus material s And a second yield limit sigma b . If sigma z1 Sum sigma z2 Less than sigma s The comprehensive stress deformation caused by the temperature difference is elastic deformation, and the bus shell is normal. If sigma z1 Sum sigma z2 Greater than sigma s And is less than sigma b The comprehensive stress deformation caused by the temperature difference is plastic deformation, the busbar shell is subjected to microscopic deformation, the damage is in the initial stage, and the busbar tearing or breakage possibly caused by long-time fatigue damage is avoided by observation and tracking. If sigma z1 Sum sigma z2 Greater than sigma b And the comprehensive stress caused by the temperature difference passes through the plastic deformation stage, the busbar shell is deformed into a sharp change stage, whether the gas in the busbar has the gas leakage phenomenon is observed, and measures are immediately taken to avoid the gas leakage of the equipment.
S104, protecting the GIS bus through the control device.
Determining the installation temperature of the GIS bus state control device;
when the temperature rises, the fixed bus is arranged at the two ends of the device, so that the fixed bus cannot move, and the whole device cannot move. Under the influence of temperature rise, the bus shell expands, so that the expansion stress is released due to compression of the disc springs at the inner side of the expansion joint flange, meanwhile, the transition bus and the movable bus are connected through the strip holes, and under the condition that the expansion stress can overcome friction force, the movable bus and the transition bus can slide in the strip holes, and the expansion stress of the movable bus and the transition bus can be released through the change of displacement; accordingly, the fixed bus can be released in stress by compressing the telescopic joint, and the movable bus and the transition bus can overcome the stress release effect of free movement due to friction force.
When the temperature drops, because the fixed bus is installed at the two ends of the device, the fixed bus cannot move, so the whole device cannot move. The expansion joint flange is characterized in that the expansion joint flange is provided with a plurality of strip holes, the strip holes are arranged on the outer sides of the expansion joint flange, the strip holes are connected with the transition buses, the transition buses are arranged on the outer sides of the expansion joint flange, the strip holes are connected with the transition buses, and the transition buses are arranged on the outer sides of the expansion joint flange; accordingly, the fixed bus can be released by compressing the telescopic joint due to the existence of the telescopic joint, and the movable bus and the transition bus can overcome the friction force to move freely), so that the expansion force caused by the temperature rise effect of the device is released, and the GIS bus cannot be damaged by low-temperature stress.
In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relation of association objects, and indicates that there may be three kinds of relations, for example, a and/or B, and may indicate that a alone exists, a and B together, and B alone exists. Wherein A, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of the following" and the like means any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural.
The foregoing is merely exemplary embodiments of the present application, and any person skilled in the art may easily conceive of changes or substitutions within the technical scope of the present application, which should be covered by the present application. The protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. The GIS bus state control method is characterized by comprising the following steps:
arranging a GIS bus in a GIS bus state control device;
respectively determining the axial stress of the GIS bus in a temperature difference change state;
determining the deformation degree of the GIS bus according to the axial stress and the material yield limit of the GIS bus;
and the GIS bus is protected by the control device.
2. The GIS bus state control method according to claim 1, wherein the determining the axial stress of the GIS bus in the temperature difference change state includes:
respectively determining expansion parameters and contraction parameters of the GIS bus under the preset limit high-temperature and limit low-temperature states;
then determining the friction force of the GIS bus and the gas force of the GIS bus;
determining the resultant force born by the GIS bus according to the GIS bus friction force and the GIS bus gas force;
and determining the axial stress of the GIS bus in a preset limit high-temperature and limit low-temperature state by combining the resultant force born by the GIS bus and the expansion parameter and the contraction parameter of the GIS bus.
3. The method for controlling the state of a GIS bus according to claim 2, wherein determining the expansion parameter of the GIS bus in a preset limit high temperature state comprises: the expansion amount of the bus shell at the limit high temperature is respectively determined as follows: ΔL 1 ＝(λ 1 -λ 2 )(t max -t 0 ) l, bus shell line strain at the limit high temperature is: epsilon 1 ＝(λ 1 -λ 2 )(t max -t 0 ) The axial expansion stress of the bus shell at the limit high temperature is as follows: sigma (sigma) 1 ＝E(λ 1 -λ 2 )(t max -t 0 ) The bus bar cylinder cross-sectional area is s=0.25pi (D 2 -d 2 ) And the axial expansion force of the bus shell at the limit high temperature is as follows: f (F) 1 ＝σ 1 S＝0.25πE(λ 1 -λ 2 )(t max -t 0 )(D 2 -d 2 ) Wherein: lambda (lambda) 1 Lambda is the linear expansion coefficient of bus bar 2 Based on the linear expansion coefficient, t max Is at the extreme high temperature, t 0 For installing the ambient temperature, l is the distance between two fixed points of the bus, E is the elastic modulus of the bus shell, D is the outer diameter of the bus cylinder, and D is the inner diameter of the bus cylinder.
4. A GIS bus bar state control method according to claim 3, wherein determining the shrinkage parameter of the GIS bus bar in a preset limit low temperature state comprises: the shrinkage of the bus shell at the limit low temperature is respectively determined as follows: ΔL 2 ＝(λ 1 -λ 2 )(t 0 -t min ) l, bus shell line strain at extreme low temperature is: epsilon 2 ＝(λ 1 -λ 2 )(t 0 -t min ) The axial shrinkage stress of the bus shell at the extreme low temperature is as follows: sigma (sigma) 2 ＝E(λ 1 -λ 2 )(t 0 -t min ) And the axial shrinkage force of the bus shell at the extreme low temperature is as follows: f (F) 2 ＝σ 2 S＝0.25πE(λ 1 -λ 2 )(t 0 -t min )(D 2 -d 2 )，t min Is at a very low temperature.
5. A method according to claim 3The GIS bus state control method is characterized by determining the GIS bus friction force and the GIS bus gas force and comprises the following steps: the bus shell support is connected with the chassis through bolts, and each bolt fastening moment is determined to be: t=0.2f y d and the pretightening force of each bolt is as follows: f (F) y ＝5T/d l The friction between the two bus bars is: f (F) m ＝nμF y ＝5Tnμ/d l ；
The gas force of the bus barrel is as follows: f (F) q ＝P×S g ＝P×π×(0.5d) 2 ＝0.25πPd 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein d l For the nominal diameter of the connecting bolts, n is the number of fastening bolts for fixing the bus and the underframe between the buses, mu is the friction coefficient, P is the gas pressure of the bus gas chamber, S g Is the bearing area of the bus end cover.
6. The method according to claim 5, wherein determining the resultant force of the GIS bus according to the GIS bus friction force and the GIS bus gas force comprises:
the resultant force born by the bus when the preset limit high temperature is determined is as follows: f (F) z1 ＝F 1 +F q -F m ＝0.25πE(λ 1 -λ 2 )(t max -t 0 )(D 2 -d 2 )－0.25πPd 2 －5Tnμ/d l ；
The resultant force born by the bus at the limit low temperature is determined as follows: f (F) z2 ＝F 2 -F q -F m ＝0.25πE(λ 1 -λ 2 )(t 0 -t min )(D 2 -d 2 )－0.25πPd 2 －5Tnμ/d l 。
7. The method for controlling the state of a GIS bus according to claim 6, wherein determining the axial stress of the GIS bus in a preset limit high-temperature and limit low-temperature state by combining the resultant force applied to the GIS bus, the expansion parameter and the contraction parameter of the GIS bus comprises:
determining bus axial stress sigma at a high temperature limit z1 ＝F z1 /S＝[0.25πE(λ 1 -λ 2 )(t max -t 0 )(D 2 -d 2 )－0.25πPd 2 －5Tnμ/d l ]/[0.25π(D 2 -d 2 )]；
The bus axial stress at the limit low temperature is determined as follows: sigma (sigma) z2 ＝F z2 /S＝[0.25πE(λ 1 -λ 2 )(t 0 -t min )(D 2 -d 2 )－0.25πPd 2 －5Tnμ/d l ]/[0.25π(D 2 -d 2 )]。
8. The method of claim 7, wherein determining the degree of deformation of the GIS bus according to the axial stress and the material yield limit of the GIS bus comprises:
determining a first yield limit sigma of a material according to a bus material s And a second yield limit sigma b ；
If sigma z1 Sum sigma z2 Less than sigma s The comprehensive stress caused by the temperature difference is deformed into elastic deformation, and the state of the bus shell is normal;
if sigma z1 Sum sigma z2 Greater than sigma s And is less than sigma b The comprehensive stress deformation caused by the temperature difference is plastic deformation, the busbar shell is subjected to microscopic deformation, the damage is in the initial stage, and the busbar tearing or breakage possibly caused by long-time fatigue damage is avoided by observation and tracking;
if sigma z1 Sum sigma z2 Greater than sigma b And the comprehensive stress caused by the temperature difference passes through the plastic deformation stage, the busbar shell is deformed into a sharp change stage, whether the gas in the busbar has the gas leakage phenomenon is observed, and measures are immediately taken to avoid the gas leakage of the equipment.
9. The GIS bus bar state control method according to any one of claims 1 to 8, wherein the GIS bus bar state control device includes: the fixed bus brackets are respectively arranged at two ends, the transition bus chassis and the movable bus chassis are arranged between the fixed bus brackets, and the fixed bus brackets, the transition bus chassis and the movable bus chassis are arranged in the concrete foundation;
the fixed bus bracket is provided with a first fixed bus and a second fixed bus respectively, and the outer side flanges of the first fixed bus and the second fixed bus are provided with cover plates; the transition bus chassis and the movable bus chassis are respectively provided with a transition bus and a movable bus, and the buses are filled with gas; an expansion joint is arranged between the first fixed bus and the movable bus, and two ends of the expansion joint are respectively and fixedly connected with the first fixed bus and the movable bus.
10. The GIS bus state control method according to claim 9, wherein the protecting the GIS bus by the control device includes:
determining the installation temperature of the GIS bus state control device;
when the temperature rises, the bus shell expands, so that the disc springs at the inner sides of the expansion joint flanges are compressed, and then the expansion stress is released, meanwhile, the transition bus and the movable bus are connected through the strip holes, and under the condition that the expansion stress overcomes the friction force, the movable bus and the transition bus can slide in the strip holes, and the expansion stress of the movable bus and the transition bus is released through the change of displacement;
or alternatively, the process may be performed,
when the temperature drops, the bus shell contracts, so that the compression stress of the disc springs at the outer sides of the telescopic joint flanges is released, meanwhile, the transition bus and the movable bus are connected through the long strip holes, the movable bus and the transition bus can slide in the long strip holes under the condition that the contraction stress overcomes friction force, and the contraction stress of the movable bus and the transition bus can be released through the change of displacement.
CN202310560574.3A 2023-05-18 2023-05-18 GIS bus state control method Pending CN116613685A (en)

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Application Number Priority Date Filing Date Title
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