CN109902443A - A kind of composite insulator internal flaw research method based on COMSOL - Google Patents
A kind of composite insulator internal flaw research method based on COMSOL Download PDFInfo
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- CN109902443A CN109902443A CN201910250440.5A CN201910250440A CN109902443A CN 109902443 A CN109902443 A CN 109902443A CN 201910250440 A CN201910250440 A CN 201910250440A CN 109902443 A CN109902443 A CN 109902443A
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- 239000012212 insulator Substances 0.000 title claims abstract description 61
- 239000002131 composite material Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000011160 research Methods 0.000 title claims abstract description 14
- 230000005684 electric field Effects 0.000 claims abstract description 44
- 230000007547 defect Effects 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000007812 deficiency Effects 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 23
- 238000004458 analytical method Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000002405 diagnostic procedure Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004861 thermometry Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The composite insulator internal flaw research method based on COMSOL that the invention discloses a kind of, a kind of composite insulator internal flaw research method based on COMSOL, the composite insulator threedimensional model of 1:1 is established including step A, using the geometry module in COMSOL simulation software；Step B, different degrees of conductive defect is set in composite insulator zero defect and different location, analyzes its space axial electric field.The present invention establishes composite insulator zero defect and the asynchronous threedimensional model of position difference defect level respectively, have studied the distribution character of its space axial electric field, the present invention can improve the deficiency of existing method, by analyzing axial electric field curve, it can be found that influence of the different defects to Insulators Used.
Description
Technical field
The present invention relates to composite insulator axial electric field research field more particularly to a kind of compound inslations based on COMSOL
Sub- internal flaw research method.
Background technique
Composite insulating material gradually substitutes traditional glass and pottery since weight is small and the functional feature of anti-pollution
Porcelain insulating material.However, the limitation widely applied main problem of composite insulator is that existing live monitoring method cannot
The state of insulation of composite insulator is diagnosed well.Live detection method both domestic and external mainly uses visual examination method, infrared ray
Thermometry, ultraviolet imaging method.Faulty insulator electric discharge dynamic characteristic is detected based on ultraviolet imagery technology, when deterioration is exhausted
When edge is located in the middle part of insulator chain, sensitivity is lower.With infrared temperature-test technology, based on insulator chain temperature curve feature
Faulty insulator diagnostic method, and the insulator in 220kV substation is detected to improve correctness.But degradation compared with
When low, temperature rise difference is not obvious.
Summary of the invention
The object of the present invention is to provide a kind of composite insulator internal flaw research method based on COMSOL, energy of the present invention
The deficiency for enough improving existing method, to insulator, there are the variations of the axial electric field of internal flaw comprehensive understanding, and judgement is fallen vacant
Fall into position.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A kind of composite insulator internal flaw research method based on COMSOL of the present invention, it is a kind of based on the compound of COMSOL
Interior insulator Study of Defects method, including
Step A, the composite insulator threedimensional model of 1:1 is established using the geometry module in COMSOL simulation software；
Step B, different degrees of conductive defect is set in composite insulator zero defect and different location, analyzes its space
Axial electric field.
Further, in step B, include the following steps,
It step B1, is that corresponding material is arranged in each part of model according to the composite insulator string of actual motion；
Step B2, the boundary condition of emulation is combined to apply corresponding electricity to compound inslation submodel according to the actual operation
Gesture；
Step B3, the subdivision of different scale is carried out for different piece；
Step B4, space axial electric field curve graph is calculated to obtain.
Further, in step B1, the material of full skirt and sheath is silicon rubber, and head and tail portion connection gold utensil material are
Stainless steel.
Further, in step B2, comprising the following steps:
In the case where ignoring space charge effects, solved using corresponding electrostatic methods, therefore insulator chain surface
And the electric field in surrounding medium solves and meets:
In formula: parameter E is the electric field strength of dielectric area, unit N/C；Parameter ε is the dielectric constant of medium；Parameter ρ
For space charge volume density, unit c/m3；Potential functionMeet formula (3)
When calculating the field distribution in composite insulator umbrella skirt surface and surrounding medium, the relative dielectric constant of air-shed is
1；The relative dielectric constant of full skirt is 6；The relative dielectric constant of sheath is 4；The dielectric constant of steel feet and chapeau de fer is 1000；
The calculating of composite insulator string space electric field is an open domain computational problem, but open domain is can not directly to carry out accurately
The problem of calculating, converting finite field for infinitely great air-shed problem using finite element modeling technology；When calculating, using
1 class boundary condition are as follows:
In above-mentioned formula: Γ0For air-shed boundary and insulator low-pressure end；ΓkFor insulator high-voltage end；Formula (4)-(5) group
At complete boundary value problem.
Further, in step B3, by local refinement subdivision method, high-precision is carried out for insulation subregion and is cutd open
Point, minimum grid selection of dimension 5mm is to guarantee computational accuracy；Air-shed big to size and regular simultaneously carries out rough subdivision
To reduce unnecessary calculation amount in simulation process, therefore the maximum mesh size of threedimensional model air-shed is taken as 50mm,
Ensure under conditions of certain precision and can improve to a certain extent calculating speed.
Further, in step B4, space axial direction curve is the axis that is calculated at insulator case surface 3mm
To electric field.
Compared with prior art, advantageous effects of the invention are as follows:
The present invention establishes composite insulator zero defect and the asynchronous threedimensional model of position difference defect level respectively, grinds
The distribution character of its space axial electric field is studied carefully, the present invention can improve the deficiency of existing method, bent by analysis axial electric field
Line, it can be found that influence of the different defects to Insulators Used.
Detailed description of the invention
The invention will be further described for explanation with reference to the accompanying drawing.
Fig. 1 is electric field component measurement point distribution figure in mesohigh end of the present invention；
Fig. 2 is intermediate voltage terminal electric field component measurement point distribution figure in the present invention；
Fig. 3 is electric field component measurement point distribution figure in mesolow end of the present invention；
Fig. 4 is the line chart that axial electric field is calculated in high-voltage end in different measurement points for defect；
Fig. 5 is the line chart that axial electric field is calculated in intermediate ends in different measurement points for defect；
Fig. 6 is the line chart that axial electric field is calculated in ground terminal in different measurement points for defect；
Specific embodiment
Referring to Fig.1-3, a specific embodiment of the invention the following steps are included:
Step A, the 110kV composite insulator threedimensional model of 1:1 is established using the geometry module in COMSOL simulation software.
Step B, different degrees of conductive defect is set in composite insulator zero defect and different location, analyzes its space
Axial electric field.Specifically comprise the following steps:
It B1, is that corresponding material, this specific implementation is arranged in each part of model according to the composite insulator string of actual motion
In the step B1 of example, the material of full skirt and sheath is silicon rubber, and head and tail portion connection gold utensil material are stainless steel.
B2, the boundary condition of emulation is combined to apply corresponding potential to compound inslation submodel according to the actual operation.
In the case where ignoring space charge effects, can be solved using corresponding electrostatic methods.Therefore insulator chain surface and week
It encloses the electric field in medium and solves and meet:
In formula: parameter E is the electric field strength of dielectric area, unit N/C；Parameter ε is the dielectric constant of medium；Parameter ρ
For space charge volume density, unit c/m3.Potential functionMeet formula (3)
When calculating the field distribution in composite insulator umbrella skirt surface and surrounding medium, the relative dielectric constant of air-shed is
1；The relative dielectric constant of full skirt is 6；The relative dielectric constant of sheath is 4；The dielectric constant of steel feet and chapeau de fer is 1000.
The calculating of composite insulator string space electric field is an open domain computational problem, but open domain is can not directly to carry out accurately
It calculates, the problem of present invention converts finite field for infinitely great air-shed problem using finite element modeling technology, to solve
It has determined the thorny problem that open domain is directly calculated.When calculating, using the 1st class boundary condition are as follows:
In above-mentioned formula: Γ0For air-shed boundary and insulator low-pressure end；ΓkFor insulator high-voltage end.Formula (4)-(5) group
At complete boundary value problem.
B3, comprehensively consider operation time and precision, the subdivision of different scale is carried out for different piece.The corresponding boundary values of electric field
Problem is solved on COMSOL Multiphysics software using finite element numerical computational methods.Using tetrahedron conduct
Basic unit carries out mesh generation to entire model.In view of the size of insulator is much smaller than the size of entire air-shed, in order to
Operation efficiency is improved, software runing time is reduced, selects local refinement subdivision method.It, can be with by local refinement subdivision method
The region of the tiny complexity such as full skirt, plug for insulator carries out high-precision subdivision, and minimum grid selection of dimension 5mm is to guarantee
Computational accuracy.Air-shed big to size and regular simultaneously carries out rough subdivision to reduce unnecessary meter in simulation process
Calculation amount, therefore the maximum mesh size of threedimensional model air-shed can be taken as 50mm, under conditions of ensuring certain precision again
Calculating speed can be improved to a certain extent.Model quantity after subdivision there are about 2,500,000 units, lay by Simulation Calculation
36 core processors, 128GB memory work station on, computation model single calculation needs the used time about 1.5 hours.
B4, space axial electric field curve graph is calculated to obtain, space axial direction curve is to calculate at insulator case surface 3mm
Obtained axial electric field.
The line chart of axial electric field is calculated in different measurement points in high-voltage end, intermediate ends, ground terminal respectively in defect
And analysis result.
One, internal flaw is in high-voltage end
From fig. 4, it can be seen that " U " font is presented in axial electric field distribution curve when insulator chain is intact, maximum field is strong
Degree is 9.47kV/cm, and field minimum intensity is 0.21kV/cm.Due to the presence of internal flaw, so that axial electric field strength is in phase
The position answered can decline.Meanwhile near the terminal position of existing defects, axial electric field strength is significantly increased, and with scarce
It falls into the increase of severity and increases.This is because caused by the internal field near defect tip increases.When defect cylindrical body
When length is 35mm, the field strength of the 2nd measurement point is 7.78kV/cm, and the field strength relative to adjacent measurement points is big.Work as defect
When cylinder length is 105mm, the field strength of the 4th measurement point is 6.85kV/m, and the field strength relative to adjacent measurement points is big.
When defect cylinder length is 210mm, the field strength of the 4th measurement point is 5.14kV/m, the field relative to adjacent measurement points
Qiang Yao great.
Two, internal flaw is in intermediate ends
As can be known from Fig. 5, when internal flaw is in intermediate ends, the variable quantity of axial electric field strength and radial electric field intensity
All increase with the increase of defect severity.From figure 3, it can be seen that the electric field strength near defect terminal position becomes
Change amount is big.
When defect cylinder length is 35mm, the field strength of the 12nd and the 13rd measurement point is relative to adjacent measurement points
Field strength it is big.When defect cylinder length is 105mm, the field strength of the 11st and the 14th measurement point is relative to adjacent survey
The field strength of amount point is big.When defect cylinder length is 210mm, the field strength of the 9th and the 16th measurement point is relative to phase
The field strength of adjacent measurement point is big.There are the different of internal flaw with high-voltage end is the electric field of defect both-side ends attachment for this
Intensity all changes, therefore this feature helps to detect the position of internal flaw and severity.
Three, internal flaw is in ground terminal
As can be known from Fig. 6, due to the presence of internal flaw, the electric field strength near defect terminal position is changed significantly increasing
Greatly.When defect cylinder length is 35mm, the field strength of the 23rd measurement point is big relative to the field strength of adjacent measurement points.When
When defect cylinder length is 105mm, the field strength of the 21st measured place is big relative to the field strength of adjacent measurement points.When defect circle
When cylinder length is 210mm, the field strength of the 18th measured place is big relative to the field strength of adjacent measurement points.
From the present invention:
1) conductive defect of composite insulator inside different location causes field distribution variation to be characterized in different,
Electric field strength near defect terminal position is changed significantly increase.This facilitates the position for detecting internal flaw.
2) there are when conductive defect inside composite insulator, the radial electric field component of measurement point is distributed between sub-pieces
Variation to axial electric field component distribution variation to become apparent.
3) there are the conductive defects of different severity to cause the amount of distortion of field distribution can be with inside composite insulator
The increase of the severity of conductive defect and increase, detect the severity of internal flaw.
Embodiment described above is only that preferred embodiment of the invention is described, and is not carried out to the scope of the present invention
It limits, without departing from the spirit of the design of the present invention, those of ordinary skill in the art make technical solution of the present invention
Various changes and improvements, should all fall into claims of the present invention determine protection scope in.
Claims (6)
1. a kind of composite insulator internal flaw research method based on COMSOL, it is characterised in that: including
Step A, the composite insulator threedimensional model of 1:1 is established using the geometry module in COMSOL simulation software；
Step B, different degrees of conductive defect is set in composite insulator zero defect and different location, analyzes its space axial direction
Electric field.
2. the composite insulator internal flaw research method according to claim 1 based on COMSOL, it is characterised in that: step
In rapid B, include the following steps,
It step B1, is that corresponding material is arranged in each part of model according to the composite insulator string of actual motion；
Step B2, the boundary condition of emulation is combined to apply corresponding potential to compound inslation submodel according to the actual operation；
Step B3, the subdivision of different scale is carried out for different piece；
Step B4, space axial electric field curve graph is calculated to obtain.
3. the composite insulator internal flaw research method according to claim 2 based on COMSOL, it is characterised in that: step
In rapid B1, the material of full skirt and sheath is silicon rubber, and head and tail portion connection gold utensil material are stainless steel.
4. the composite insulator internal flaw research method according to claim 2 based on COMSOL, it is characterised in that: step
In rapid B2, comprising the following steps:
In the case where ignoring space charge effects, solved using corresponding electrostatic methods, therefore insulator chain surface and week
It encloses the electric field in medium and solves and meet:
In formula: parameter E is the electric field strength of dielectric area, unit N/C；Parameter ε is the dielectric constant of medium；Parameter ρ is sky
Between electric charge volume density, unit c/m3；Potential functionMeet formula (3)
When calculating the field distribution in composite insulator umbrella skirt surface and surrounding medium, the relative dielectric constant of air-shed is 1；Umbrella
The relative dielectric constant of skirt is 6；The relative dielectric constant of sheath is 4；The dielectric constant of steel feet and chapeau de fer is 1000；
The calculating of composite insulator string space electric field is an open domain computational problem, but open domain is directly to be accurately calculated
, the problem of converting finite field for infinitely great air-shed problem using finite element modeling technology；When calculating, using the 1st class
Boundary condition are as follows:
In above-mentioned formula: Γ0For air-shed boundary and insulator low-pressure end；ΓkFor insulator high-voltage end；Formula (4)-(5) constitute
Complete boundary value problem.
5. the composite insulator internal flaw research method according to claim 2 based on COMSOL, it is characterised in that: step
In rapid B3, by local refinement subdivision method, high-precision subdivision, minimum grid selection of dimension 5mm are carried out for insulation subregion
To guarantee computational accuracy；Air-shed big to size and regular simultaneously carries out rough subdivision need not in simulation process to reduce
The calculation amount wanted, therefore the maximum mesh size of threedimensional model air-shed is taken as 50mm, under conditions of ensuring certain precision
Calculating speed can be improved to a certain extent again.
6. the composite insulator internal flaw research method according to claim 2 based on COMSOL, it is characterised in that: step
In rapid B4, space axial direction curve is the axial electric field that is calculated at insulator case surface 3mm.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111829663A (en) * | 2020-06-19 | 2020-10-27 | 南方电网科学研究院有限责任公司 | Composite insulator defect classification diagnosis method based on surface temperature distribution |
| CN112182940A (en) * | 2020-10-23 | 2021-01-05 | 国网天津市电力公司 | High-voltage switch cabinet insulation partition plate arrangement optimization method considering microenvironment |
| CN113076672A (en) * | 2021-04-08 | 2021-07-06 | 江苏省送变电有限公司 | Composite insulator bird pecking defect risk grade evaluation method based on improved SSD |
| CN113325280A (en) * | 2021-05-26 | 2021-08-31 | 国网陕西省电力公司电力科学研究院 | GIS insulator defect electric field simulation method based on finite element analysis |
| CN113486542A (en) * | 2021-02-02 | 2021-10-08 | 上海大学 | Slag applied electric field modeling method based on COMSOL |
| CN114155756A (en) * | 2021-11-11 | 2022-03-08 | 国网江苏省电力有限公司技能培训中心 | Porcelain insulator crack defect simulation device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111829663A (en) * | 2020-06-19 | 2020-10-27 | 南方电网科学研究院有限责任公司 | Composite insulator defect classification diagnosis method based on surface temperature distribution |
| CN112182940A (en) * | 2020-10-23 | 2021-01-05 | 国网天津市电力公司 | High-voltage switch cabinet insulation partition plate arrangement optimization method considering microenvironment |
| CN112182940B (en) * | 2020-10-23 | 2022-03-11 | 国网天津市电力公司 | High-voltage switch cabinet insulation partition plate arrangement optimization method considering microenvironment |
| CN113486542A (en) * | 2021-02-02 | 2021-10-08 | 上海大学 | Slag applied electric field modeling method based on COMSOL |
| CN113076672A (en) * | 2021-04-08 | 2021-07-06 | 江苏省送变电有限公司 | Composite insulator bird pecking defect risk grade evaluation method based on improved SSD |
| CN113076672B (en) * | 2021-04-08 | 2024-02-02 | 江苏省送变电有限公司 | Composite insulator bird pecking defect risk level assessment method based on improved SSD |
| CN113325280A (en) * | 2021-05-26 | 2021-08-31 | 国网陕西省电力公司电力科学研究院 | GIS insulator defect electric field simulation method based on finite element analysis |
| CN114155756A (en) * | 2021-11-11 | 2022-03-08 | 国网江苏省电力有限公司技能培训中心 | Porcelain insulator crack defect simulation device |
| CN114155756B (en) * | 2021-11-11 | 2024-03-26 | 国网江苏省电力有限公司技能培训中心 | Porcelain bottle crack defect simulation device |
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