CN108710763A - 220kV power transmission line column line couple system icing emulation modes - Google Patents
220kV power transmission line column line couple system icing emulation modes Download PDFInfo
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Abstract
A kind of 220kV power transmission line columns line couple system icing emulation mode, includes the following steps：（1）Icing Transmission Tower-line couple system finite element modeling；Steel tower is modeled including the use of unit mirroring command；Insulator and split conductor conductor spacer are modeled；To division sub-conductor and ground wire modeling；（2）Power transmission line column line couple system is carried out looking for shape；（3）Power transmission line column line couple system ice coating load calculates；（4）Power transmission line column line couple system icing-wind load calculates；（5）Response computation and data extraction and analysis under icing.The present invention carries out fining tower line finite element modeling using unit mirroring command, and modeling period is short, and computational efficiency is high；It is modeled according to the actual arrangement mode of split conductor, it is contemplated that the coupling between split conductor sub-conductor, model are finer.Analytic method and FInite Element are combined and are simulated to conducting wire by the present invention, solve overhead line finite element modeling and look for the technical barrier of shape.
Description
Technical field
The present invention relates to a kind of 220kV power transmission line columns line couple system icing emulation modes, belong to power transmission line technical field.
Background technology
The safe and stable operation of transmission line of electricity is the key that ensure electric energy transmission.China is that powerline ice-covering accident occurs
More country, in winter, under the weather conditions such as long-term low temperature and sleet, snowfall, transmission of electricity lead, ground wire and shaft tower surface can be attached
It accumulated snow and forms icing.Icing can cause the mechanics failure of line construction, so as to cause the mechanical damages accident such as tower, broken string,
Lead to the line fault of large area.In the design specification that China uses at present, the calculating of steel tower load separately considers tower and conducting wire,
Ice load checking computations when designing shaft tower are also to be directed to fixed operating mode, for the practical mistake of transmission line of electricity under extreme weather conditions
Loading capability can not then consider.And actual transmission line of electricity is the entirety being formed by connecting by multiple electric power pylons and grounded-line, outside
Under the action of portion's load, it can influence each other between electric power pylon, insulator and overhead line.The icing density exposure to take place frequently occurs
There is certain limitations for row design specification, it is difficult to meet the needs of actual motion.Therefore it needs to consider power transmission tower-line-
The coupled characteristic of insulator establishes more rational analysis model.
Domestic and foreign scholars have done numerous studies for the simulation analysis of power transmission line column line couple system icing, and achieve
Certain achievement, but still have following deficiency：1. existing study the mode for mostly using equivalent process, i.e., by split conductor etc.
Effect is that a conducting wire is analyzed, and has ignored the coupling between sub-conductor.2. the practical same strain section inside conductor water of transmission line of electricity
Horizontal stress is identical everywhere, and suspension insulator can be maintained at vertical state when line construction is completed, and existing research has ignored mostly
Tangent tower insulator deviates caused by assigning identical initial strain to conducting wire in modeling process, is not carried out to tower wire body system initial
Shape is looked for, or considers the initial of tower wire body system and looks for shape, but it is slow to calculate complex and convergence rate.3. in the calculating of icing
It is uniformly distributed on overhead line surface with icing in finite element simulation, is usually assumed that, icing is carried out using a variety of equivalent methods
Simulation, the inertia for acting on power lower icing do not fully consider；4. existing research method is mostly to be directed to the single work of icing
The research of condition, and practical power transmission line is exposed under severe natural environment, it is necessary to consider a variety of weatherability tests, and transmission line icing
Usually along with gentle breeze, need to consider the response characteristic under ice coating load and gentle breeze load collective effect.
Invention content
The object of the present invention is to be directed to existing for the existing research of the simulation analysis of power transmission line column line couple system icing
Deficiency proposes that a kind of 220kV power transmission line columns line couple system icing emulation mode, collection modeling look for shape, icing to be calculated as one
Body.
Realize that technical scheme is as follows, a kind of 220kV power transmission line columns line couple system icing emulation mode, institute
The method of stating includes the following steps：
(1) icing Transmission Tower-line couple system finite element modeling；Steel tower is modeled including the use of unit mirroring command；
Insulator and split conductor conductor spacer are modeled；To division sub-conductor and ground wire modeling；
(2) power transmission line column line couple system is carried out looking for shape；
(3) power transmission line column line couple system ice coating load calculates；
(4) power transmission line column line couple system icing-wind load calculates；
(5) response computation and data extraction and analysis under icing.
The tower line coupling system finite element modeling method is as follows：
It is catenary that power transmission line is formed by shape under natural suspension status；The catenary equation formula of aerial condutor：
In formula：LH=0For the catenary length (m) of contour suspension point overhead line；σ0For the axial stress of arc sag minimum point
(MPa)；γ is overhead line dead weight than carrying (MPa/m)；Q is the linear mass (kg/km) of overhead line；A is cutting for overhead line
Area (mm2)；H is the height difference (m) of overhead line both ends hitch point.
Sub-conductor and ground wire are separated into a series of node that 1m are interval according to catenary equation, these nodes are connected
Grounded-line model is formed, to obtain the initial finite element model of tower line coupling system.
It is described shape to be looked for power transmission line column line couple system steps are as follows：
Obtained tower line coupling system finite element model applies initial strain, opens large deformation switch and Stress stiffening switch,
It carries out from weight analysis；After the completion of analysis, modal displacement and stress are checked in preprocessor, relative error are calculated, with default receipts
It holds back criterion to compare, reaches convergence precision range, then stop calculating, shape is looked for terminate；If not up to convergence precision, according to displacement knot
Fruit updates all node coordinates of power transmission line column-line couple system finite element model, re-starts from weight analysis, repeats above-mentioned
Process looks for shape to complete until displacement reaches convergence precision with stress, and acquisition looks for power transmission line column-line couple system after shape to have
Limit meta-model.
The power transmission line column line couple system ice coating load calculates as follows：
Ice load is simulated using additional mass elements method, the equivalent model of glaze icing is concentric with overhead line
Hollow cylinder, density takes 0.9g/cm3, the volume calculation formula of icing is：
In formula：V is unit length icing volume/m3；D is aerial line computation outer diameter/mm；B is ice covering thickness/mm；
The load of icing is the gravity of icing on unit length overhead line, then the ice load of unit length overhead line is：
In formula：FIceIt is overhead line unit length ice load/N；D is aerial line computation outer diameter/mm；B be ice covering thickness/
mm；G is acceleration of gravity, takes 9.8ms-2。
The power transmission line column line couple system icing-wind load calculates as follows：
In ice coating state, whole outer diameter becomes larger overhead line so that the front face area of overhead line increases.List when icing
The wind pressure calculation formula of bit length overhead line is：
Fv=βcαfμcsB(d+2b)Wvsin2θ×10-3 (4)
In formula：FvIt is unit length overhead line icing wind pressure value/N；βcIt is wind load regulation coefficient；αfIt is that wind pressure is uneven
Coefficient；μcsIt is wind load Shape Coefficient；B is icing wind load enhancement coefficient；WvBe wind speed be v when wind pressure standard value/Pa；D is frame
Ceases to be busy outer diameter/mm；B is ice covering thickness/mm；θ be wind direction with line direction angle/°.
Response computation and data extraction and analytical method are as follows under the icing：
Obtained ice load or icing wind load are applied in finite element model corresponding node, carried out in solver
It solves；After calculating, displacement structure, stress and unbalanced tensile force data are extracted in general preprocessor, to transmission of electricity
The icing and icing-wind-excited responese of circuit are analyzed.
The beneficial effects of the present invention are the present invention proposes that a kind of collection based on ANSYS APDL language models, looks for shape, covers
Ice calculates the multi-state Transmission Tower-line couple system icing emulation mode being integrated.The present invention is suitable for taking place frequently ground to icing disaster
The transmission line of electricity in area carries out icing response analysis, carries out local stiffening to transmission line of electricity on the basis of this or icing disaster is pre-
It is alert, to which casualty loss is preferably minimized.
The present invention carries out fining tower line finite element modeling using unit mirroring command, and modeling period is short, and computational efficiency is high；
It is modeled according to the actual arrangement mode of split conductor, it is contemplated that the coupling between split conductor sub-conductor, model are finer.
Analytic method and FInite Element are combined and are simulated to conducting wire by the present invention, solve overhead line finite element modeling and look for the skill of shape
Art problem.First, overhead line is modeled according to catenary formula, is conducted oneself with dignity to tower-line couple system after the completion of modeling
Under iterative solution accurate model is finally obtained according to the coordinate of the lower displacement update tower-line couple system of dead weight.This hair
It is bright that ice load is simulated using additional mass elements method, fully consider the gravity and effect of inertia of icing,
This method is easy to operate, and computational accuracy is high, applicable for the static analysis and kinematic analysis of icing overhead line
Description of the drawings
Fig. 1 is the steel tower tower leg finite element model before mirror image unit；
Fig. 2 is the steel tower tower leg finite element model after mirror image unit；
Fig. 3 is that power transmission line column line couple system looks for shape flow chart；
Fig. 4 is that power transmission line column line couple system looks for shape result figure；
Fig. 4 (a) is before adjusting；
Fig. 4 (b) is after adjusting；
Fig. 5 is the power transmission line column line couple system finite element model after looking for shape；
Fig. 6 is the power transmission line column line couple system finite element model after looking for shape；
Fig. 7 is power transmission line axle power curve under icing operating mode；
Fig. 8 is power transmission line end axle power time-history curves under icing-wind composite condition；
Fig. 9 is electric power pylon unbalanced tensile force time-history curves under icing-wind composite condition；
In figure, 1 is conducting wire；2 be optical cable；3 be ground wire；4 be static；5 be dynamic.
Specific implementation mode
The implementation process of the present invention is exemplified below.
The present embodiment is a strain section of Jiangxi Province Power Network 220kV single loop overhead transmission lines.The strain section contains
Three base steel towers, intermediate steel tower are tangent tower, model ZMC4-27；Both ends steel tower is anchor support, model JCI-30.Left and right shelves
Away from respectively 137m, 462m.Conducting wire is to be vertically arranged binary fission conducting wire, and wire type is 2 × JL/G1A-300/40, ground line style
Number be OPGW-36B1-120, ground wire model JLB35-120.
The present embodiment power transmission line column line couple system icing emulation mode, mainly includes the following steps that：
Step 1：Establish power transmission line column line couple system finite element model；
Step 1-1：Electric power pylon models
Electric power pylon is modeled using the APDL language of ANSYS softwares, makes full use of the high degree of symmetry of electric power pylon
Property, steel tower is modeled using unit mirroring command, node and unit extra after mirror image unit are merged.With strain insulator
For the modeling of tower tower leg, Fig. 1 show the tower leg finite element model before mirror image, and Fig. 2 show the tower leg finite element mould after mirror image
Type.
Step 1-2：Insulator and the modeling of split conductor conductor spacer；
Step 1-3：Divide sub-conductor and ground wire modeling；
Split conductor, ground wire relevant parameter are substituted into catenary equation (1),
It is interval node that sub-conductor and ground wire, which are separated into a series of 1m, according to equation, these nodes are connected to be formed and are led
Ground line model obtains the initial finite element model of tower line coupling system.
Step 2：Power transmission line column line couple system is carried out looking for shape；
Shape flow chart is looked for as shown in figure 3, to the tower line coupling system finite element model that step 1 obtains, applies initial strain, bullet
Property modulus and acceleration of gravity, open large deformation switch and Stress stiffening switch, tower line coupling system carried out from weight analysis, point
After the completion of analysis, modal displacement and stress are checked in preprocessor, calculates relative error, compared with default convergence criterion, are reached
Convergence precision range then stops calculating, shape is looked for terminate.If not up to convergence precision, node coordinate is updated according to displacement result,
Gravity solution is re-started, is repeated the above process, until displacement reaches convergence precision with stress, shape is looked for complete.After looking for shape
Three tower of transmission line of electricity, two line model as shown in figure 4, Fig. 4 (a) be adjustment before, Fig. 4 (b) be adjustment after；The enlarged drawing of anchor support
As shown in Figure 5 and Figure 6.
Step 3：Power transmission line column line couple system ice coating load calculates；
According to actual measurement ice covering thickness, corresponding ice load size is calculated according to formula (3).
Step 4：Power transmission line column line couple system icing-wind combined load calculates；
According to actual measurement wind speed and wind angle, corresponding icing-wind load size is calculated according to formula (4)：
Fv=βcαfμcsB(d+2b)Wvsin2θ×10-3 (4)
Step 5：Icing response computation and data extraction and analysis.
Ice load icing-wind combined load that step 3 or 4 obtain is applied in finite element model corresponding node,
It is solved in solver.Power transmission line axle power curve under icing operating mode is as shown in fig. 7, line end of transmitting electricity under icing-wind composite condition
Portion's axle power time-history curves are as shown in figure 8, electric power pylon unbalanced tensile force time-history curves are as shown in Figure 9 under icing-wind composite condition.
After calculating, the curves such as displacement structure, stress time-histories, unbalanced tensile force are extracted in general preprocessor, from
And the response of the icing of transmission line of electricity is analyzed.
Claims (6)
1. a kind of 220kV power transmission line columns line couple system icing emulation mode, which is characterized in that the method includes following steps
Suddenly：
(1) icing Transmission Tower-line couple system finite element modeling；Steel tower is modeled including the use of unit mirroring command；To exhausted
Edge and the modeling of split conductor conductor spacer；To division sub-conductor and ground wire modeling；
(2) power transmission line column line couple system is carried out looking for shape；
(3) power transmission line column line couple system ice coating load calculates；
(4) power transmission line column line couple system icing-wind load calculates；
(5) response computation and data extraction and analysis under icing.
2. 220kV power transmission line columns line couple system icing emulation mode according to claim 1, which is characterized in that institute
It is as follows to state tower line coupling system finite element modeling method：
It is catenary that power transmission line is formed by shape under natural suspension status；According to catenary equation by sub-conductor and ground wire from
A series of node that 1m are interval is dissipated into, these nodes are connected to form grounded-line model, to obtain tower line coupling system
Initial finite element model.
3. 220kV power transmission line columns line couple system icing emulation mode according to claim 1, which is characterized in that institute
It states and shape is looked for power transmission line column line couple system steps are as follows：
Obtained tower line coupling system finite element model applies initial strain, opens large deformation switch and Stress stiffening switch, carries out
From weight analysis；After the completion of analysis, modal displacement and stress are checked in preprocessor, calculates relative error, are sentenced with default convergence
According to comparing, convergence precision range is reached, then stops calculating, shape is looked for terminate；If not up to convergence precision, more according to displacement result
All node coordinates of new power transmission line column-line couple system finite element model re-start from weight analysis, repeat above-mentioned mistake
Journey looks for shape to complete until displacement reaches convergence precision with stress, and acquisition looks for power transmission line column-line couple system after shape limited
Meta-model.
4. 220kV power transmission line columns line couple system icing emulation mode according to claim 1, which is characterized in that institute
It is as follows to state the calculating of power transmission line column line couple system ice coating load：
Ice load is simulated using additional mass elements method, the equivalent model of glaze icing is the sky concentric with overhead line
Heart cylinder, density take 0.9g/cm3, the volume calculation formula of icing is：
In formula：V is unit length icing volume/m3；D is aerial line computation outer diameter/mm；B is ice covering thickness/mm；
The load of icing is the gravity of icing on unit length overhead line, then the ice load of unit length overhead line is：
In formula：FIceIt is overhead line unit length ice load/N；D is aerial line computation outer diameter/mm；B is ice covering thickness/mm；G is
Acceleration of gravity takes 9.8ms-2。
5. 220kV power transmission line columns line couple system icing emulation mode according to claim 1, which is characterized in that institute
It is as follows to state power transmission line column line couple system icing-wind load calculating：
In ice coating state, whole outer diameter becomes larger overhead line so that the front face area of overhead line increases；Unit when icing is long
Degree overhead line wind pressure calculation formula be：
Fv=βcαfμcsB(d+2b)Wvsin2θ×10-3
In formula：FvIt is unit length overhead line icing wind pressure value/N；βcIt is wind load regulation coefficient；αfIt is wind evil attacking lung；
μcsIt is wind load Shape Coefficient；B is icing wind load enhancement coefficient；WvBe wind speed be v when wind pressure standard value/Pa；D is outside overhead line
Diameter/mm；B is ice covering thickness/mm；θ be wind direction with line direction angle/°.
6. 220kV power transmission line columns line couple system icing emulation mode according to claim 1, which is characterized in that institute
It is as follows to state response computation and data extraction and analytical method under icing：
Obtained ice load or icing wind load are applied in finite element model corresponding node, asked in solver
Solution；After calculating, displacement structure, stress and unbalanced tensile force data are extracted in general preprocessor, to power transmission line
The icing and icing-wind-excited responese on road are analyzed.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109583112A (en) * | 2018-12-06 | 2019-04-05 | 中北大学 | A kind of aerial condutor based on ABAQUS finite element software looks for shape method |
| CN109614751A (en) * | 2018-12-29 | 2019-04-12 | 国网江西省电力有限公司电力科学研究院 | A kind of lower distribution line Analysis of Bearing Capacity method of ice load effect |
| CN109848993A (en) * | 2019-02-20 | 2019-06-07 | 武汉纺织大学 | One kind is for flexible electrical line of force robot for overhauling posture control method under wind load action |
| CN110427638A (en) * | 2019-06-06 | 2019-11-08 | 国网湖南省电力有限公司 | The initial form finding analysis method and system of powerline ice-covering stress |
| CN111125945A (en) * | 2019-11-28 | 2020-05-08 | 广东电网有限责任公司 | Method and device for evaluating ultimate wind resistance capability of power transmission line |
| CN111651804A (en) * | 2020-03-31 | 2020-09-11 | 重庆科技学院 | Calculation method for conventional power transmission tower and line design wind load based on inertia force method and tower line separation method considering tower line coupling influence |
| CN111737862A (en) * | 2020-06-11 | 2020-10-02 | 国网山西省电力公司经济技术研究院 | Multi-span overhead transmission line icing shape finding calculation method based on static balance |
| CN111859767A (en) * | 2020-07-30 | 2020-10-30 | 国网重庆市电力公司电力科学研究院 | Power transmission line icing risk simulation evaluation method and device |
| CN113642221A (en) * | 2021-08-27 | 2021-11-12 | 贵州电网有限责任公司 | Method for determining high-risk pole tower system according to height difference and span |
| CN114239353A (en) * | 2021-12-14 | 2022-03-25 | 国网江苏省电力有限公司经济技术研究院 | Mounting optimization arrangement method for newly-increased base stations of shared towers based on extreme value response surface |
| CN114818420A (en) * | 2022-04-18 | 2022-07-29 | 内蒙古电力（集团）有限责任公司内蒙古电力经济技术研究院分公司 | Rapid modeling method for initial configuration of power transmission conductor |
| CN117688818A (en) * | 2024-01-31 | 2024-03-12 | 合肥工业大学 | Numerical simulation method for power distribution network line galloping and failure rules under extreme weather |
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| CN109583112A (en) * | 2018-12-06 | 2019-04-05 | 中北大学 | A kind of aerial condutor based on ABAQUS finite element software looks for shape method |
| CN109614751A (en) * | 2018-12-29 | 2019-04-12 | 国网江西省电力有限公司电力科学研究院 | A kind of lower distribution line Analysis of Bearing Capacity method of ice load effect |
| CN109848993A (en) * | 2019-02-20 | 2019-06-07 | 武汉纺织大学 | One kind is for flexible electrical line of force robot for overhauling posture control method under wind load action |
| CN110427638A (en) * | 2019-06-06 | 2019-11-08 | 国网湖南省电力有限公司 | The initial form finding analysis method and system of powerline ice-covering stress |
| CN111125945A (en) * | 2019-11-28 | 2020-05-08 | 广东电网有限责任公司 | Method and device for evaluating ultimate wind resistance capability of power transmission line |
| CN111651804B (en) * | 2020-03-31 | 2022-08-26 | 重庆科技学院 | Conventional power transmission line design wind load calculation method considering tower line coupling influence |
| CN111651804A (en) * | 2020-03-31 | 2020-09-11 | 重庆科技学院 | Calculation method for conventional power transmission tower and line design wind load based on inertia force method and tower line separation method considering tower line coupling influence |
| CN111737862A (en) * | 2020-06-11 | 2020-10-02 | 国网山西省电力公司经济技术研究院 | Multi-span overhead transmission line icing shape finding calculation method based on static balance |
| CN111737862B (en) * | 2020-06-11 | 2023-08-29 | 国网山西省电力公司经济技术研究院 | Multi-span overhead transmission line icing and shape finding calculation method based on static balance |
| CN111859767A (en) * | 2020-07-30 | 2020-10-30 | 国网重庆市电力公司电力科学研究院 | Power transmission line icing risk simulation evaluation method and device |
| CN113642221A (en) * | 2021-08-27 | 2021-11-12 | 贵州电网有限责任公司 | Method for determining high-risk pole tower system according to height difference and span |
| CN114239353A (en) * | 2021-12-14 | 2022-03-25 | 国网江苏省电力有限公司经济技术研究院 | Mounting optimization arrangement method for newly-increased base stations of shared towers based on extreme value response surface |
| CN114239353B (en) * | 2021-12-14 | 2023-08-04 | 国网江苏省电力有限公司经济技术研究院 | Extremum response surface-based shared pole tower newly-added base station mounting optimization arrangement method |
| CN114818420A (en) * | 2022-04-18 | 2022-07-29 | 内蒙古电力（集团）有限责任公司内蒙古电力经济技术研究院分公司 | Rapid modeling method for initial configuration of power transmission conductor |
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| CN117688818A (en) * | 2024-01-31 | 2024-03-12 | 合肥工业大学 | Numerical simulation method for power distribution network line galloping and failure rules under extreme weather |
| CN117688818B (en) * | 2024-01-31 | 2024-04-30 | 合肥工业大学 | Numerical simulation method for power distribution network line galloping and failure rules under extreme weather |
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