CN109003762B - A kind of crimping optimization method of composite insulator - Google Patents
A kind of crimping optimization method of composite insulator Download PDFInfo
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- CN109003762B CN109003762B CN201810888361.2A CN201810888361A CN109003762B CN 109003762 B CN109003762 B CN 109003762B CN 201810888361 A CN201810888361 A CN 201810888361A CN 109003762 B CN109003762 B CN 109003762B
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- fitting
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- pretightning force
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
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Abstract
The invention discloses a kind of crimping optimization method of composite insulator, the available optimal composite insulator suitable under various environmental conditions of this method crimps model.A kind of crimping optimization method of composite insulator, comprising the following steps: S1, modeling；S2, simulation operating condition, it include: S21, fitting pressure contact portion under the identical operating condition of axial pre tightening force distribution operating condition, simulate a variety of radially pretightning force distribution operating conditions, it fixes two end movement of plug and axial displacement is applied to fitting along axial direction again after applying pretightning force to it, therefrom select tensile property optimum operating condition；S22, fitting pressure contact portion are radially under the identical operating condition of pretightning force distribution operating condition, it simulates a variety of along axial pre tightening force distribution operating condition, it fixes two end movement of plug and axial displacement is applied to fitting along axial direction again after applying pretightning force to it, therefrom select tensile property optimum operating condition；S3, analog result: combining step S21, S22 therefrom select crimping scheme of the optimum operating condition as composite insulator.
Description
Technical field
The present invention relates to composite insulator technical fields, more particularly to a kind of crimping optimization method of composite insulator.
Background technique
The slippage destruction of the fitting and glass plug of composite insulator is high voltage transmission line road frequently problem,
The pretightning force size of insulator end fitting plays a decisive role in influencing composite insulator tensile property first, but mistake
The radial stress that big pretightning force will also result in glass plug is excessive and lead to the brittle break of plug, and is similarly pre-tightening
Under the effect of power size, the distribution of pretightning force is also to influence one of the principal element of composite insulator tensile strength.Obviously, it insulate
The improper crimping of interest tool causes structure caused by occurring to slide between glass plug brittle break and fitting and glass plug to be lost
Effect.But without specific compression bonding method in current producer's production technology.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of crimping optimization method of composite insulator,
This method has carried out numerical simulation and analysis to the most common sliding rupture in composite insulator failure mode, proposes end
Fitting pretightning force optimization method has obtained crimping model suitable for the optimal composite insulator under various environmental conditions.
The object of the present invention is achieved like this:
A kind of crimping optimization method of composite insulator, comprising the following steps:
S1, modeling
The simulation model of composite insulator is established by finite element software, and model parameter is set；
S2, simulation operating condition
S21, fitting pressure contact portion simulate a variety of radially pretightning forces under the identical operating condition of axial pre tightening force distribution operating condition
It is distributed operating condition, fix two end movement of plug and axial displacement is applied to fitting along axial direction again after applying pretightning force to it, therefrom
Select tensile property optimum operating condition；
S22, fitting pressure contact portion radially under the identical operating condition of pretightning force distribution operating condition, are simulated a variety of along axial pre tightening force
It is distributed operating condition, fix two end movement of plug and axial displacement is applied to fitting along axial direction again after applying pretightning force to it, therefrom
Select tensile property optimum operating condition；
S3, analog result
Combining step S21, S22 therefrom select crimping scheme of the optimum operating condition as composite insulator.
Preferably, in S1.1, simulation model is established by ANSYS finite element software, overall model is mono- using SOLID95
Member, mandrel surface osculating element use TARGE170 unit, and fitting surface contact unit uses CONTA174 unit.
Preferably, in S1.1, coefficient of friction value 0.3 between fitting and plug, plug length takes 70mm, and diameter takes
24mm, model meshes radially divide equally 32 sections, are divided along axially dividing equally 10 sections, end metal fitting length takes 35mm, and outer diameter takes
32mm, the same plug of internal diameter, model meshes radially divide equally 32 sections, are divided along axially dividing equally 20 sections.
Preferably, in S21, radially pretightning force is distributed operating condition for 4 kinds of simulation, comprising: by the radially even distribution of pretightning force
For 8 pieces of regions；4 pieces of regions are distributed as by pretightning force is radially even；3 pieces of regions are distributed as by pretightning force is radially even；It will
Pretightning force is radially integrally uniformly distributed.
Preferably, in S22, simulation 4 kinds along axial pre tightening force be distributed operating condition, comprising: it is axially distributed away from fitting port at
Fitting crimps span access location length and 1/4-1/2 fitting crimps span access location length two parts；It is axially distributed away from fitting port at
Fitting crimps span access location length；Pretightning force covers entire fitting surface；It is axially distributed golden away from 0-3/4 at fitting port
Tool crimping span access location length.
Preferably, in S22, the 4th kind of optimization is distributed operating condition along axial pre tightening force, comprising: along axial reserved away from hardware end
8% fitting crimp span access location length without pretightning force section；It reserves along axial away from 17% fitting of hardware end crimping span access location length
Without pretightning force section.
By adopting the above-described technical solution, the invention has the following beneficial effects:
Composite insulator failing load depends on the pretightning force size of fitting and plug, and destructive characteristics are mainly fitting
Sliding is generated between plug causes structural failure.In the case where pretightning force size is constant, the distribution situation of fitting pretightning force
Have a great impact to the tensile strength of composite insulator.It is abound with when pretightning force is radially even in fitting and endless all standing
When the entire inner face of fitting, insulator tensile property performance at this time is optimal.Insulator hardware it is preferably fixed without pretightning force siding-to-siding block length
It is the 18% to 25% of fitting entire length.Shown under normal temperature state based on optimal compression joint technique model analysis, optimal mould
The more current authentic producer process conditions of the elastic ultimate load of type increase 8.23%.
Detailed description of the invention
Fig. 1 is that the pretightning force of fitting pressure contact portion is circumferentially divided into 8 sections of schematic diagrames being evenly distributed at fitting port；
Fig. 2 a- Fig. 2 d is different radial distribution pretightning force Work condition analogue schematic diagrames；
Fig. 3 is the tensile displacement curve graph of different radial distribution pretightning force operating conditions；
Fig. 4 a- Fig. 4 d is axially different distribution pretightning force Work condition analogue schematic diagram；
Fig. 5 is the tensile displacement curve graph of axially different distribution pretightning force operating condition；
Fig. 6 a, which is that pretightning force is radially even, is distributed in fitting surface, reserves away from hardware end 3mm along axial without preload
Simulate schematic diagram in power section；
Fig. 6 b, which is that pretightning force is radially even, is distributed in fitting surface, reserves away from hardware end 6mm along axial without preload
Simulate schematic diagram in power section.
Specific embodiment
1. typical case's crimping composite insulator tension test
By taking conventional voltage 22KV power transmission line composite insulator as an example, tension under the high/low temperature of composite insulator is carried out and has tried
It tests.Test uses Instron1186 electronic universal tester, carries out material mechanical performance test by Bit andits control, research is multiple
Close tensile property of the insulator respectively under high/low temperature effect.The pretightning force of end metal fitting is circumferentially divided into 8 sections and is evenly distributed on
Such as Fig. 1 at fitting port.
Known to test: the failure mode of composite insulator is not to occur since glass plug reaches the load intensity limit
Caused by destruction, but before not up to intensity, sliding is generated between fitting and glass fibre plug, leads to end metal fitting
Pulling with plug leads to structural failure.
2. composite insulator mechanical property numerical simulation under room temperature
2.1 model parameter
It is provided according to producer, fitting mechanical property parameters are as shown in table 2.1.
2.1 Q235 structural carbon steel fitting mechanical property of table
Simulation model is established by ANSYS finite element software, correlation analysis is carried out to it, overall model uses SOLID95
Unit, mandrel surface osculating element use TARGE170 unit, and fitting surface contact unit uses CONTA174 unit, fitting
Coefficient of friction value 0.3 between plug.Wherein plug length takes 70mm, and diameter takes 24mm, and model meshes are radially divided equally
It 32 sections, is divided along axially dividing equally 10 sections, end metal fitting length takes 35mm, and outer diameter takes 32mm, the same plug of internal diameter, model net
Lattice radially divide equally 32 sections, are divided along axially dividing equally 20 sections.
2.2 model operating conditions and analog result
Insulator tension simulation on Mechanical operating condition is always divided into two steps, and the first step simulates four radially pretightning forces point
Cloth operating condition fixes two end movement of plug and applies axial displacement, Cong Zhongxuan to fitting along axial direction again after applying pretightning force to it
It takes different axial pre tightening forces to be distributed to it again after tensile property optimum operating condition out, repeats above-mentioned simulation steps, therefrom select most
Excellent operating condition is alternative as the optimization pretightning force of end metal fitting.
2.2.1 different radial distribution pretightning force Work condition analogues
Operating condition 1: being simulated experiment truth, be distributed as 8 pieces of regions for pretightning force is radially even as shown in Figure 2 a,
It is axially distributed at away from 17.5mm at fitting port (half of hardware end length), this operating condition is that the production of existing producer is multiple
Close the time of day of insulator.
Operating condition 2: as shown in Figure 2 b, being distributed as 4 pieces of regions for pretightning force is radially even, axially distributed to away from fitting
At port at 17.5mm.
Operating condition 3: being as shown in Figure 2 c, is distributed as 3 pieces of regions for pretightning force is radially even, axially distributed to away from gold
Have at port at 17.5mm.
Operating condition 4: as shown in Figure 2 d, axially distributed at away from fitting port by the radially even distribution of pretightning force
At 17.5mm.
2.2.2 different radial distribution pretightning force analog results
It can be seen from the tensile displacement curve graph of Fig. 3 operating condition 1 (simulated experiment truth pretightning force, radially
Even distributed load region is divided into 8 pieces) elastic ultimate load size be 52.166KN, very with the 51.341KN of experimental result
It is close, and the elastic ultimate load size of operating condition 4 (pretightning force is uniformly distributed along axial direction) is 54.961KN, tension performance is optimal,
Secondly the corresponding pulling force size of elastic limit of operating condition 1 (simulated experiment truth pretightning force is radially even to be distributed as 8 pieces)
The corresponding pulling force size of elastic limit for 52.166KN, operating condition 2 (pretightning force is radially even to be distributed as 4 pieces) is
The corresponding pulling force size of elastic limit of 51.886KN, operating condition 3 (pretightning force is radially even to be distributed as 3 pieces) is
49.157KN tension performance is worst.
2.2.3 axially different distribution pretightning force Work condition analogue
Finite element modeling and the analysis for carrying out operating condition 5- operating condition 8, mainly consider axially different distribution pretightning force situation.In detail
It is thin as follows:
Operating condition 5: as shown in 4a, by the radially even distribution of pretightning force, it is axially distributed away from 0mm at fitting port extremely
8.75mm (0-1/4 fitting length) and 17.5mm to 26.25mm (1/4-1/2 fitting length) two parts.
Operating condition 6: as shown in Figure 4 b, axially distributed away from 8.75mm at fitting port by the radially even distribution of pretightning force
To 26.25mm (1/4-3/4 fitting length).
Operating condition 7: as illustrated in fig. 4 c, by the radially even distribution of pretightning force, it is axially distributed away from 0mm at fitting port extremely
At 35mm (pretightning force covers entire fitting surface).
Operating condition 8: as shown in figure 4d, axially distributed away from (0-3/4 at fitting port by the radially even distribution of pretightning force
Fitting length).
2.2.4 axially different distribution pretightning force analog result
It can be seen that simulation operating condition 7 from tensile displacement curve graph shown in fig. 5 (pretightning force covers entire fitting surface)
Elastic ultimate load it is maximum, be 58.61KN, however its curve reaches elastic limit in structure unlike other operating conditions
It also maintains yielding stage afterwards, but the failure of structure directly occurs, this is because pretightning force covers entire fitting table
Face, causes to produce sliding between fitting and plug, the structural model without pretightning force is completely covered, in drawing process
In, plug is not caused the deformation of shape by the position at pretightning force after the fitting for being had pretension portion by rear end squeezes,
So that plug and fitting contact surface shape become discontinuously, therefore the yielding stage after elastic ultimate load is produced, so work
Condition 7 is undesirable.The operating condition other than operating condition 7 is reviewed, (pretightning force edge is divided axially into away from 0mm to 8.75mm at fitting port operating condition 5
With two sections at 17.5mm to 26.25mm) elastic ultimate load size be 53.127KN；(pretightning force is axially distributed for operating condition 6
Away from fitting port away from 8.75mm to 26.25mm at fitting port at) elastic ultimate load size be 54.512KN；Operating condition 8
Pretightning force it is axially distributed at away from fitting port 0mm at 26.25mm) elastic ultimate load size be 56.46mm；And
There are the material reinforcement stages for three kinds of operating conditions, and in contrast, operating condition 8 is optimum operating condition.
3 optimal pretightning force surface analysis
From the above numerical analysis comparing result it is found that being distributed in fitting and endless all standing when pretightning force is radially even
When the entire inner face of fitting (reserved certain length without pretightning force section), the tensile property performance of insulator is optimal, now just absolutely
Edge is further analyzed without pretightning force section, to obtain optimal dimensionless insulator pretightning force interval range.
Operating condition 9: as shown in Figure 6 a, pretightning force is radially even to be distributed in fitting surface, along axial reserved away from hardware end
3mm without pretightning force section.
Operating condition 10: as shown in Figure 6 b, pretightning force is radially even to be distributed in fitting surface, along axial reserved away from fitting end
Portion 6mm without pretightning force section.
As can be seen that when displacement reaches 3mm or so, curve graph starts the decline stage occur, this is because golden when operating condition 9
Tool is pulled out without producing sliding between plug behind pretightning force section, and the elastic ultimate load size of operating condition 10 is
56.69KN, very close with the elastic ultimate load 56.46KN of operating condition 8, synthesis is optimal.It can to sum up judge, without pre-
Clamp force siding-to-siding block length is optimal when accounting for the 18% to 25% of fitting entire length.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (5)
1. a kind of crimping optimization method of composite insulator, which comprises the following steps:
S1, modeling
The simulation model of composite insulator is established by ANSYS finite element software, overall model uses SOLID95 unit, plug
Surface contact unit uses TARGE170 unit, and fitting surface contact unit uses CONTA174 unit, and model parameter is arranged；
S2, simulation operating condition
S21, fitting pressure contact portion simulate a variety of radially pretightning forces and are distributed work under the identical operating condition of axial pre tightening force distribution operating condition
Condition fixes two end movement of plug and applies axial displacement to fitting along axial direction again after applying pretightning force to it, therefrom selects anti-
Draw best performance operating condition；
S22, fitting pressure contact portion radially under the identical operating condition of pretightning force distribution operating condition, are simulated a variety of along axial pre tightening force distribution work
Condition fixes two end movement of plug and applies axial displacement to fitting along axial direction again after applying pretightning force to it, therefrom selects anti-
Draw best performance operating condition；
S3, analog result
Combining step S21, S22 therefrom select crimping scheme of the optimum operating condition as composite insulator.
2. a kind of crimping optimization method of composite insulator according to claim 1, which is characterized in that in S1, fitting with
Coefficient of friction value 0.3 between plug, plug length take 70mm, and diameter takes 24mm, and model meshes radially divide equally 32 sections, edge
Axially divide equally 10 sections to be divided, end metal fitting length takes 35mm, and outer diameter takes 32mm, and the same plug of internal diameter, model meshes are radially
It respectively 32 sections, is divided along axially dividing equally 20 sections.
3. a kind of crimping optimization method of composite insulator according to claim 1, which is characterized in that in S21, simulation 4
Kind radially pretightning force is distributed operating condition, comprising: is distributed as 8 pieces of regions for pretightning force is radially even；Pretightning force is radially equal
It is even to be distributed as 4 pieces of regions；3 pieces of regions are distributed as by pretightning force is radially even；Pretightning force is radially integrally uniformly distributed.
4. a kind of crimping optimization method of composite insulator according to claim 1, which is characterized in that in S22, simulation 4
Kind is distributed operating condition along axial pre tightening force, comprising: axially distributed away from 0-1/4 fitting crimping span access location length and 1/4- at fitting port
1/2 fitting crimps span access location length two parts；It is axially distributed to crimp span access location length away from 1/4-3/4 fitting at fitting port；It pre-tightens
Power covers entire fitting surface；It is axially distributed to crimp span access location length away from 0-3/4 fitting at fitting port.
5. a kind of crimping optimization method of composite insulator according to claim 4, which is characterized in that in S22, optimization the
4 kinds are distributed operating condition along axial pre tightening force, comprising: reserve away from 8% fitting of hardware end crimping span access location length along axial without preload
Power section；It reserves away from 17% fitting of hardware end crimping span access location length along axial without pretightning force section.
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| CN201810888361.2A CN109003762B (en) | 2018-08-07 | 2018-08-07 | A kind of crimping optimization method of composite insulator |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202487300U (en) * | 2012-03-28 | 2012-10-10 | 方明 | Intelligent control and detection system for manufacture and crimp connection of composite insulator |
| CN106018099A (en) * | 2016-06-22 | 2016-10-12 | 国网河南省电力公司电力科学研究院 | System and method for detecting crimping quality of end fitting of composite insulator |
-
2018
- 2018-08-07 CN CN201810888361.2A patent/CN109003762B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202487300U (en) * | 2012-03-28 | 2012-10-10 | 方明 | Intelligent control and detection system for manufacture and crimp connection of composite insulator |
| CN106018099A (en) * | 2016-06-22 | 2016-10-12 | 国网河南省电力公司电力科学研究院 | System and method for detecting crimping quality of end fitting of composite insulator |
Non-Patent Citations (1)
| Title |
|---|
| 复合绝缘子压接技术及影响因素;赵卉等;《电瓷避雷器》;20140815;第1-7页 |
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