CN105680367A - Method for solving spacing rod problem of bundled conductor power transmission line pole tower - Google Patents
Method for solving spacing rod problem of bundled conductor power transmission line pole tower Download PDFInfo
- Publication number
- CN105680367A CN105680367A CN201610103708.9A CN201610103708A CN105680367A CN 105680367 A CN105680367 A CN 105680367A CN 201610103708 A CN201610103708 A CN 201610103708A CN 105680367 A CN105680367 A CN 105680367A
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- conductor
- conductor spacer
- transmission line
- torsional rigidity
- spacer
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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
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
-
- 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
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/12—Devices for maintaining distance between parallel conductors, e.g. spacer
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- Suspension Of Electric Lines Or Cables (AREA)
Abstract
The invention provides a method for solving a spacing rod problem of a bundled conductor power transmission line pole tower, relating the field of running of a power transmission line in an ice-coated region and solving the problem that a torsional angle of a slight bundled conductor in an ice-coated region probably exceeds a critical instability angle to cause a danger to the safe and stable running of a circuit. According to the method, the maximum torsional rigidity and the minimum torsional rigidity of a binary bundle conductor under the conditions that different quantities of spacing rods are installed are simulated and analyzed, and are compared with the maximum torsional rigidity and the minimum torsional rigidity with a quaternary bundled conductor in a spacing rod arrangement mode during actual engineering, and the corresponding spacing rod quantity and installation position can be regarded as a spacing rod installation scheme of a slight bundled large-section conductor when the torsional rigidity and the instability torque of the previous one is larger than or approximate to the torsional rigidity and the instability torque of the latter one. By the method, the safety and the reliability of the power transmission line in the ice-coated region are ensured, meanwhile, the usage quantity of the spacing rod is optimized, and the investment cost is saved.
Description
Technical field
The present invention relates to the conductor spacer of electric power line pole tower and arrange field, a kind of method especially relating to conductor spacer Layout Problem solving split conductor transmission line of electricity bar.
Background technology
The split conductor of heavy icing area icing ultra-high-tension power transmission line at non-homogeneous icing, wind load, wave or in fault current situation, due to difference loaded on each sub-conductor, can pass through conductor spacer to split conductor produce moment of torsion effect. When moment of torsion is bigger, it is possible to wire of causing a split upset twisting, namely twist unstability.
In most cases, after the factor causing wire to overturn eliminates, restoring moment is enough to make it be returned to normal condition. In reality, as long as wire can be returned to its original state after non-equilibrium condition eliminates, it is usually acceptable. But, split conductor can not happen occasionally to the situation of initial condition by selfer after there is upset twisting. After there is split conductor twisting accident, must flow through the extraneous reactive torque that applies and just can make its reinstatement, the harm that transmission line of electricity safe operation is caused by split conductor upset twisting accident can not be ignored, and the generation of this accident will be avoided must to study the torque characteristic of split conductor.
Existing torque characteristic that transmission line of electricity is carried out is studied to plan that the method that shaft tower conductor spacer is arranged mainly has two kinds: one is to do torsion test at laboratory by reducing model, and one is to be simulated torsion test by setting up numerical model. There is not only costliness but also there is limitation in the former, just must may apply in actual transmission line of electricity by the conversion of equivalent coefficient by result of the test; The numerical model set up has been done too much simplification and has processed by the existing technology of the latter, as all adopted single conductor model, even the situation of split conductor is also equivalent to single conductor model and is simulated, and the main situation considering two shelves.
Therefore, the above two method of prior art all can not the torque characteristic of entirely accurate transmission line simulation conductor spacer installation place.
Summary of the invention
It is an object of the invention to: can not the problem of torque characteristic of entirely accurate transmission line simulation conductor spacer installation place for prior art, and provide one to utilize Finite Element Method, physical parameter according to transmission line of electricity, more precisely simulation ice-coating circuit torque characteristic under various conditions, to determine torsional rigidity and the unstability load of circuit, and the method solving the conductor spacer Layout Problem of split conductor transmission line of electricity bar.
The goal of the invention of the present invention is achieved through the following technical solutions:
A kind of method of conductor spacer Layout Problem solving split conductor transmission line of electricity bar, it is characterised in that the method includes:
Ice coating load according to actual observation, it is determined that A root split conductor torsional stability under given conductor spacer arrangement;
Setting up span be N rice, split conductor is B root the FEM (finite element) model of the transmission line of electricity with conductor spacer;
Utilizing the FEM (finite element) model set up, be further applied load the deformation obtained in wire twist process in conductor spacer installation place;
Utilize the FEM (finite element) model set up, change each influence factor respectively in conductor spacer installation place, obtain applying the torque characteristic of transmission line of electricity under different affecting factors;
According to torsional response time consistent with the A root split conductor torsional stability of actual observation of the B root split conductor, it is determined that the layout of the conductor spacer of B root split conductor.
As further technical scheme, FEM (finite element) model includes lead model and conductor spacer model; Each sub-conductor ginseng beam element simulations such as 2 nodes in lead model; Conductor spacer beam element is simulated, displacement between each conductor spacer and wire and being rotationally connected, and the relation of being rotationally connected has counted the contribution to split conductor torsional rigidity of the sub-conductor stiffness by itself.
As further technical scheme, it is further applied load in conductor spacer installation place and includes gravity and torque load.
As further technical scheme, each affecting parameters includes heading spacing, span, gear number, conductor spacer arrangement; Torque characteristic includes torsional rigidity and unstability moment of torsion.
As further technical scheme, the quantity A of split conductor > B.
As further technical scheme, span N rice is 500m.
As further technical scheme, B root split conductor FEM (finite element) model the drawn minimum and maximum torsional rigidity when installing varying number conductor spacer contrasts with A root split conductor minimax torsional rigidity under conductor spacer arrangement in Practical Project, when the former torsional rigidity and unstability moment of torsion more than and during close to the torsional rigidity of the latter and unstability moment of torsion, the conductor spacer quantity of the former correspondence is the conductor spacer of B root split conductor and installs quantity.
Compared with prior art, the present invention physical parameter according to transmission line wire and conductor spacer, by simplifying and model construction, model basis is analyzed the torque characteristic of different interval rod place wire, to simulate the impact on wire torque characteristic of the various affecting parameters, can optimize and re-cover the few divisural line line conductor conductor spacer layout design in ice formation, improve wire anti-torsion ability, reduce the harm that transmission line of electricity safe operation is caused by split conductor upset twisting accident, and save construction investment, it it is the breakthrough to " re-covering ice shelf sky Transmission Line Design technical regulation ", China from now on is re-covered ice formation circuit design and has opened up new thinking, theoretical foundation is provided, there is the social benefit of significant warp.
Accompanying drawing explanation
Fig. 1 is for estimating that the idealization rime icing of opplied moment accumulates;
Fig. 2 is the double bundle conductor FEM (finite element) model of installation interval rod;
Fig. 3 is the double bundle conductor FEM (finite element) model applying gravity and torque load;
Fig. 4 is the deformation in wire twist process;
Fig. 5 is the Changing Pattern of the conductor spacer place torsional rigidity under the different heading spacings that non-equidistance is arranged;
Fig. 6 is the Changing Pattern of the conductor spacer place torsional rigidity under the different heading spacings being equally spaced;
Fig. 7 is the Changing Pattern of the torsional rigidity at each conductor spacer place under 400m span;
Fig. 8 is the Changing Pattern of the torsional rigidity at each conductor spacer place under 500m span;
Fig. 9 is the Changing Pattern of the torsional rigidity at each conductor spacer place under 600m span;
Figure 10 is conductor spacer equidistant mounting means torsional rigidity largest interval rod place torque-twist curve;
Figure 11 is the Changing Pattern of each conductor spacer place torsional rigidity under the different gear numbers that non-equidistance is arranged;
Figure 12 is the Changing Pattern of each conductor spacer place torsional rigidity under the different gear numbers being equally spaced;
Figure 13 attaches most importance to Ice Area binary fission (1250/100) lead spacer layout design scheme.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
The present invention provides a kind of method of conductor spacer Layout Problem solving split conductor transmission line of electricity bar, comprises the steps:
A, adopt actual observation ice coating load, obtain quadripartion (630/45) wire torsional stability under given conductor spacer arrangement.
B, set up span to be 500m, wire be the FEM (finite element) model of binary fission (such as 1250/100) the transmission line of electricity with conductor spacer;
C, utilize the step b model set up, be further applied load in conductor spacer installation place, obtain the deformation in wire twist process;
D, utilize the step b model set up, change each influence factor respectively in conductor spacer installation place, obtain applying the torque characteristic of transmission line of electricity under different affecting factors;
E, determine torsional response when binary fission (such as 1250/100) wire is consistent with the quadripartion 630/45 wire torsional stability of actual observation, it is determined that reasonably conductor spacer method for arranging.
In the present embodiment, using the isolated shelves strain section of 500kV as typical strained section, this circuit is 500m without the discrepancy in elevation, span, determines the impact on torque characteristic such as wire heading spacing, gear number, span conductor spacer arrangement on this basis again. Wire simplified model is as shown in Figure 1 for the binary fission (such as 1250/100) that above-mentioned typical strained section adopts.
In step a, first research quadripartion JL/G1A-630/45 wire is under given conductor spacer arrangement, adopts the ice coating load of actual observation to study its torsional stability. Considering the isolated shelves of span respectively 300m, 400m, 500m, 600m, 700m, wire heading spacing is 450mm. In the design process, the average time span of 20mm～60mm ice formation conductors on quad bundled is respectively adopted 50m, 40m, 35m, 30m, 20m. Ice coating load adopts the actual icing operating mode of two beaches-Zi Gong circuit observation, is simplified the flag-shaped shape that gained is quasi-triangle as shown in Figure 1. Sub-conductor icing on one side is piled up and is estimated as 20cm, and its thickness is 2.0mm, and density is 0.4g/cm3. Thus its quality is 16g/cm, torque arm length is assumed to 20/3cm, and therefore can obtain its eccentric moment under unit length ice coating load effect is 1.05N.m. The ice coating load of simplification is applied on quadripartion 630/45 wire, for verifying quadripartion 630/45 wire torsional stability under different spans, varying number conductor spacer are arranged.
In step b, circuit simplified model includes lead model and conductor spacer model. Each sub-conductor ginseng beam element simulations such as 2 nodes in lead model; Conductor spacer beam element is simulated, displacement between each conductor spacer and wire and being rotationally connected. The relation of being rotationally connected has counted the contribution to split conductor torsional rigidity of the sub-conductor stiffness by itself. By the FEM (finite element) model including wire and conductor spacer of preceding method foundation as shown in Figure 2.
Being further applied load (as shown in Figure 3) in conductor spacer installation place in step c, including gravity and torque load, obtains the deformation in wire twist process as shown in Figure 4.
Affecting parameters in step d includes heading spacing, span, gear number, conductor spacer arrangement; The torque characteristic of transmission line of electricity includes torsional rigidity and unstability moment of torsion.
Affecting parameters is to the affecting laws of torque characteristic respectively:
The impact of heading spacing: Fig. 5, Fig. 6 respectively illustrate non-equidistance and arrange and be equally spaced down, the load at each conductor spacer place during binary fission wire heading spacing respectively 650mm, 700mm, 750mm, 800mm, it can be seen that the torsional rigidity of the same conductor spacer position of split conductor and unstability moment of torsion all increase along with the increase of heading spacing.
The impact of gear number: Fig. 7, Fig. 8, Fig. 9 show consideration include one grade, third gear, four kinds of situations such as five grades and seven grades of strain sections, span 500m, be 6 without the discrepancy in elevation, conductor spacer quantity, adopt grade span and two kinds of arrangements of non-grade span, torque load is all applied to each conductor spacer place of middle gear, the Changing Pattern of torsional rigidity. It can be seen that when gear number becomes continuous shelves from isolated shelves, be all slightly reduced at same conductor spacer place, its torsional rigidity and unstability moment of torsion, when strain section is continuous shelves, along with the increase of its gear number, its torsional rigidity and unstability moment of torsion are almost constant.
The impact of span: Figure 10 show conductor spacer span respectively 400m, 500m, 600m, 700m, without the discrepancy in elevation, adopt grade span equidistant mounting means torsional rigidity largest interval rod place torque-twist curve, it will be apparent from this figure that minimax torsional rigidity corresponding to each conductor spacer place and unstability moment of torsion are all slightly reduced along with the increase of span.
Conductor spacer arrangement affects: Figure 11, Figure 12 respectively illustrate non-equidistance and arrange and be equally spaced down, Changing Pattern without the torsional rigidity at the isolated each conductor spacer place of shelves, span respectively 400m, 500m, 600m of the discrepancy in elevation, for its middle conductor spacer, its torsional rigidity and unstability change in torque are less, and for end conductor spacer, the change of its torsional rigidity is also less, but its unstability change in torque is relatively big, and the critical torque of grade span is more than the critical torque of not grade span. Therefore, the overturning stability of grade span arrangement is better than not grade span.
In step e, when drawing installation varying number conductor spacer according to FEM (finite element) model, the minimum and maximum torsional rigidity of binary fission (such as 1250/100) wire, and then contrast with quadripartion 630/45 wire minimax torsional rigidity under conductor spacer arrangement in Practical Project, when the former torsional rigidity and unstability moment of torsion more than and during close to the torsional rigidity of the latter and unstability moment of torsion, namely the conductor spacer quantity of its correspondence can be considered the conductor spacer mount scheme of few division large-section lead.
Based on conductors on quad bundled conductor spacer method for arranging in design discipline, adopt binary fission (such as 1250/100) wire, by when being equally spaced conductor spacer, for 300m and 600m span, determine conductor spacer quantity and position by current designs code;400m, 600m and 700m span then needs to increase by 1; During by non-equidistance arrangement interval rod, for 300m and 400m span, remain unchanged; 500m span can reduce 1. Conductor spacer position after reducing or increasing still is pressed design discipline and is calculated. According to simulation result analysis, obtain under conductor spacer arrangement, re-covering the heading spacing selection scheme of ice formation binary fission (such as 1250/100) wire as shown in figure 13 in Practical Project.
The method adopting the present embodiment, compensate for and on actual track, do torsion test not only costliness but also there is circumscribed deficiency, transmission line simulation torque characteristic is carried out by setting up few oidiospore lead model and many grades of circuits, can more fully and truly reflect the Changing Pattern of few split conductor torsional rigidity and unstability moment of torsion, more reasonably determine conductor spacer method for arranging.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, it is noted that all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention.
Claims (7)
1. the method for the conductor spacer Layout Problem solving split conductor transmission line of electricity bar, it is characterised in that the method includes:
Ice coating load according to actual observation, it is determined that A root split conductor torsional stability under given conductor spacer arrangement;
Setting up span be N rice, split conductor is B root the FEM (finite element) model of the transmission line of electricity with conductor spacer;
Utilizing the FEM (finite element) model set up, be further applied load the deformation obtained in wire twist process in conductor spacer installation place;
Utilize the FEM (finite element) model set up, change each influence factor respectively in conductor spacer installation place, obtain applying the torque characteristic of transmission line of electricity under different affecting factors;
According to torsional response time consistent with the A root split conductor torsional stability of actual observation of the B root split conductor, it is determined that the layout of the conductor spacer of B root split conductor.
2. the method for a kind of conductor spacer Layout Problem solving split conductor transmission line of electricity bar according to claim 1, it is characterised in that FEM (finite element) model includes lead model and conductor spacer model; Each sub-conductor ginseng beam element simulations such as 2 nodes in lead model; Conductor spacer beam element is simulated, displacement between each conductor spacer and wire and being rotationally connected, and the relation of being rotationally connected has counted the contribution to split conductor torsional rigidity of the sub-conductor stiffness by itself.
3. the method for a kind of conductor spacer Layout Problem solving split conductor transmission line of electricity bar according to claim 1, it is characterised in that be further applied load in conductor spacer installation place and include gravity and torque load.
4. the method for a kind of conductor spacer Layout Problem solving split conductor transmission line of electricity bar according to claim 1, it is characterised in that each affecting parameters includes heading spacing, span, gear number, conductor spacer arrangement; Torque characteristic includes torsional rigidity and unstability moment of torsion.
5. the method for a kind of conductor spacer Layout Problem solving split conductor transmission line of electricity bar according to claim 1, it is characterised in that the quantity A of split conductor > B.
6. the method for a kind of conductor spacer Layout Problem solving split conductor transmission line of electricity bar according to claim 1, it is characterised in that span N rice is 500m.
7. the method for a kind of conductor spacer Layout Problem solving split conductor transmission line of electricity bar according to claim 1, it is characterized in that, B root split conductor FEM (finite element) model the drawn minimum and maximum torsional rigidity when installing varying number conductor spacer contrasts with A root split conductor minimax torsional rigidity under conductor spacer arrangement in Practical Project, when the former torsional rigidity and unstability moment of torsion more than and during close to the torsional rigidity of the latter and unstability moment of torsion, the conductor spacer quantity of the former correspondence is the conductor spacer of B root split conductor and installs quantity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610103708.9A CN105680367A (en) | 2016-02-25 | 2016-02-25 | Method for solving spacing rod problem of bundled conductor power transmission line pole tower |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610103708.9A CN105680367A (en) | 2016-02-25 | 2016-02-25 | Method for solving spacing rod problem of bundled conductor power transmission line pole tower |
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| CN105680367A true CN105680367A (en) | 2016-06-15 |
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Cited By (2)
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| CN111029964A (en) * | 2019-12-12 | 2020-04-17 | 重庆大学 | Ice disaster defense method for restraining torsion of lead by distributed suspension counter weight |
| CN111090919A (en) * | 2018-10-24 | 2020-05-01 | 国网浙江省电力有限公司 | Optimized modeling method and system for spacer in three-dimensional design of transformer substation |
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