CN207036404U - A kind of analogue means for being used to measure single grade of wire tension change of transmission line of electricity - Google Patents
A kind of analogue means for being used to measure single grade of wire tension change of transmission line of electricity Download PDFInfo
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- CN207036404U CN207036404U CN201720862158.9U CN201720862158U CN207036404U CN 207036404 U CN207036404 U CN 207036404U CN 201720862158 U CN201720862158 U CN 201720862158U CN 207036404 U CN207036404 U CN 207036404U
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- 239000000725 suspension Substances 0.000 abstract description 13
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- 238000002474 experimental method Methods 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 7
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Abstract
The utility model discloses a kind of analogue means for being used to measure single grade of wire tension change of transmission line of electricity,Including framework,The track being placed on framework,Fixed pulley above track,The running block for being placed on track and being rolled along track and the wire rolled by fixed pulley traction running block,Track includes curvilinear left rail and right rail,Running block includes left chain wheel,The connecting shaft of right pulley and connection left and right pulley,Weight is hung with connecting shaft,The utility model can be according to wire type,The factors such as wire span change,The transmission line of electricity simulation of more than hundred meters spans is foreshortened in several meters,Ensure suspension string stress characteristic with it is consistent on former transmission line of electricity in the case of,The tension variation of corresponding transmission pressure can accurately and effectively be reflected,Ensure the accuracy and reliability of transmission pressure design,And greatly reduce experiment difficulty,Empirical risk and experimentation cost.
Description
Technical field
The utility model is related to electric power line pole tower load test field, more particularly to a kind of simulation precision it is higher and
The good analogue means for being used to measure single grade of wire tension change of transmission line of electricity of applicability.
Background technology
With the rapid development of the national economy, Electricity Demand continues to increase, power network scale is expanded rapidly, pass through spy
The construction and operation of ultra-high-tension power transmission line, China's power network have evolved into the power network that structure in the world is most complicated, largest, electricity
Netting twine road mechanics calculation of electrical wire is typically based on theoretical calculation and finite element modelling, for the continuous shelves wire of domestic and international transmission line of electricity
The experiment of tension test is less.
E.S.Healy, A.J.Wright are led in 220kV Wallenpaupack-Siegfried circuits are designed to transmission of electricity
Line icing produces unbalanced tensile force and has carried out experimental study, and diagram method is demonstrated by the result of the test in one mile of span
Correctness, and think that application can be designed based on this.
Jamaleddine et al. carries out the model test that deices of two grades of transmission lines of electricity, using the method for falling mass come
Simulation ice-coating comes off, and draws dynamic and steady-error coefficient that wire deices, and establish corresponding FEM model according to test model
Verified, the result that two methods are drawn is very close.
Existing test method is generally divided into two kinds, and one kind is using the transmission line of electricity experiment of support engineering, this mode model list
One, do not possess changeability；Another kind is simulated using scaled model, and because transmission pressure is in catenary shape, scaled model can not
The situation of the actual transmission line of electricity of accurate simulation.Therefore, it is necessary to study one kind can transmission line simulation wire tension change, again
Line parameter circuit value can flexibly be changed, effectively reduce the wire tension change modeling device that test site takes.
Utility model content
The utility model mainly solve existing power network line mechanics calculation of electrical wire based on theoretical calculation and finite element modelling,
The technical problem of actual transmission line of electricity stressing conditions can not be accurately reflected；Provide the use that a kind of simulation precision is high and applicability is good
In the analogue means of single grade of wire tension change of measurement transmission line of electricity.
In order to solve above-mentioned technical problem, the utility model mainly uses following technical proposals：
A kind of analogue means for being used to measure single grade of wire tension change of transmission line of electricity of the present utility model, including framework,
It is placed in the track on framework, the fixed pulley above track, the running block for being placed on track and being rolled along track and passes through
The wire that fixed pulley traction running block rolls, the track includes the left rail for being symmetrical arranged and being parallel to each other and right rail, described
Left rail and right rail are curvilinear, and the running block includes left chain wheel, right pulley and the connecting shaft for connecting left and right pulley, the left side
The race of pulley is caught in left rail and rolled along left rail, and the race of the right pulley is caught in right rail and rolled along right rail, the wire
Running block rolling is drawn in one end with the connection axis connection and by connecting shaft, and the other end of wire is led by the way that fixed pulley is external
Draw mechanism, weight is hung with connecting shaft, analogue means can be according to the change of the factors such as wire type, wire span, by hundred
The transmission line of electricity simulation of rice above span is foreshortened in several meters of distances, in guarantee suspension string stress characteristic and on former transmission line of electricity
In the case of consistent, can accurately and effectively reflect the tension variation of transmission pressure, ensure Transmission Line Design accuracy and can
By property, and experiment difficulty, the risk and cost are greatly reduced, and by wire tension change modeling computational methods, obtained song
Line model x-y functional relations, the curve-like track that processing output makes, then ensure that the accuracy of the horizontal pulling test of wire
And applicability.
Preferably, the wire of the fixed pulley side is connected with tensiometer and displacement meter, tensiometer and displacement meter are trying
The tension variation of reflection wire that can be accurately and timely in testing and the displacement of movable pulley, facilitate the accurate acquisition of test parameters.
The center of the connecting shaft is provided with the wire locating slot of ring-type, and the end of the wire is annular in shape and is sheathed on described
In wire locating slot, the both sides of wire locating slot are provided with hanging wire locating slot, hang the weight hanging wire upper end of weight annularly and cover
In hanging wire locating slot, corresponding wire and hanging wire locating slot are set on connecting shaft surface, prevent wire and hanging wire in experiment
Shift, make the movement of suspension weight steady, guarantee test parameter it is accurate and reliable.
Preferably, the upper and lower end of the left rail is respectively equipped with positioning link stopper, lower positioning link stopper, the right side
The upper and lower end of rail is respectively equipped with position block, lower positioning link stopper, and left and right rail both ends set positioning link stopper respectively, can
To prevent that in test movable pulley departs from from the rail of left and right, eliminates safe hidden trouble, the reliability of experiment is improved.
The simulation method changed for transmission line simulation wire Horizontal Tension because caused by changing span, it is walked
It is rapid as follows：
(1) according to the span and the discrepancy in elevation of transmission line of electricity actual design condition, wire type and comprehensive load g are determined；
(2) according to wire type, sectional area of wire A, wire elastic modulus E and initial tension T are obtainedm；
(3) according to as above parameter, suspension string bottom wire clamp terminal level amount of deflection △ L is obtained, △ L are equally divided into n parts
Horizontal displacement △ l, △ L=n × △ l；
(4) bottom wire clamp horizontal displacement △ l and wire Horizontal Tension T relationship when establishing suspension string deflection：
Wherein, wire Horizontal Tension after T changes for span, unit N；
L is the actual span of wire, unit m；
△ l are suspension string bottom wire clamp displacement, unit m；
TmFor wire initial level tension force, unit N；
G is wire comprehensive load, unit N/m；
β is height difference angle, unit °；
E is wire modulus of elasticity, units MPa；
A is sectional area of wire, unit mm2；
The relevant parameter of foregoing determination is substituted into, T- △ l relation formulas can be obtained；
(5) according to T- △ l relation formulas, the wire tension for often increasing a △ l is calculated；
(6) wire Horizontal Tension-T- △ l relational theory curves corresponding to span variable quantity are drawn；
(7) according to △ L=n × △ l and above-mentioned T- △ l relational theory curves, suspension string bottom wire clamp terminal level is obtained
Wire Horizontal Tension T under offset △ L；
And the orbital curve computational methods in analogue means are as follows：
(1) the fixed pulley position and selection movable pulley model are determined according to design requirement, wherein under the orbital curve
End coordinate is (0,0), and the horizontal range positioned at the fixed pulley center on orbital curve top and orbital curve bottom is a, fixed
Vertical range at the top of pulley with orbital curve bottom is b, a diameter of D of movable pulley；
(2) point of contact coordinate of the movable pulley on orbital curve is set as (x, y), and corresponding movable pulley center of circle coordinate isObtain movable pulley roll dl when each infinitesimal between relation：
Wherein,For the tangent line horizontal sextant angle at movable pulley and orbital curve contact point；
(3) establish wire tension T and wire tension simulates attached heavy GHBalanced relationship：
Wherein, θ is wire and x-axis horizontal sextant angle；
GHSimulated for wire tension attached heavy；
(4) establish wire and pull length infinitesimal dl and angleBetween relation：
(5) according to T- △ l relation formulas, with reference to 3~formula of formula 5, using Matlab software programs, calculate l-x and
L-y functional relation；
(6) functional relation according to l-x and l-y, obtains curve model x-y functional relations, complete according to the curve model
Into the drafting of orbital curve；
Drafting and output by orbital curve, the making of curve-like track is completed, orbital curve is accurate, meets that single grade is led
The test requirements document of line tension change.
The beneficial effects of the utility model are：Analogue means can according to the change of the factors such as wire type, wire span,
The transmission line of electricity simulation of more than hundred meters spans is foreshortened in several meters of distances, in guarantee suspension string stress characteristic and in former power transmission line
On road it is consistent in the case of, can accurately and effectively reflect the tension variation of transmission pressure, ensure the accuracy of Transmission Line Design
And reliability, and experiment difficulty, the risk and cost are greatly reduced, and by wire tension change modeling computational methods, obtain
Curve model x-y functional relations, processing output make curve-like track, then ensure that the standard of the horizontal pulling test of wire
True property and applicability.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the present utility model.
Fig. 2 is the movable pulley stress diagram in Fig. 1.
Fig. 3 is the movable pulley stress decomposing schematic representation in Fig. 2.
Fig. 4 is the orbital curve x-y function relation curve schematic diagrames in Fig. 1.
Fig. 5 is T- △ l relations measured curves and the theoretical curve control of wire Horizontal Tension-span variable quantity corresponding relation
Schematic diagram.
1. framework in figure, 2. tracks, 21. left rails, 22. right rails, 3. fixed pulleys, 4. running blocks, 41. left chain wheels, 42. is right
Pulley, 43. connecting shafts, 5. bracing wires, 6. weights, 7. tensiometers, 8. displacement meters, 9. weight hanging wires.
Embodiment
Below by embodiment, and with reference to accompanying drawing, the technical solution of the utility model is described in further detail.
Embodiment：A kind of analogue means for being used to measure single grade of wire tension change of transmission line of electricity of the present embodiment, such as Fig. 1
It is shown, including framework 1, the track 2 being placed on framework, the fixed pulley 3 above track, it is placed on track and is rolled along track
Running block 4 and the wire 5 that running block rolls is drawn by fixed pulley, track includes the left side that is symmetrical arranged and is parallel to each other
Rail 21 and right rail 22, left rail and right rail are curvilinear, and its pattern curve is obtained by calculating, running block include left chain wheel 41,
The connecting shaft 43 of right pulley 42 and connection left and right pulley, the race of left chain wheel are caught in left rail and rolled along left rail, the wheel of right pulley
Groove is caught in right rail and rolled along right rail, and wire one end rolls with being connected axis connection and drawing running block by connecting shaft, wire
The other end external haulage gear after tensiometer 7 and displacement meter 8 is connected by fixed pulley, be hung with weight 6 in connecting shaft；
There is the wire locating slot of ring-type in the central design of connecting shaft, the end of wire is annular in shape and is set in wire positioning
In groove, hanging wire locating slot is designed with the both sides of wire locating slot, the upper end of weight hanging wire 9 of weight is hung annularly and is set in
In hanging wire locating slot, positioning link stopper, lower positioning link stopper are respectively designed with the upper and lower end of left rail, in the upper of right rail
End and bottom are respectively equipped with position block, lower positioning link stopper.
The simulation method changed for transmission line simulation wire Horizontal Tension because caused by changing span, it is walked
It is rapid as follows：
(1) according to the span and the discrepancy in elevation of transmission line of electricity actual design condition, wire type and comprehensive load g are determined；
(2) according to wire type, sectional area of wire A, wire elastic modulus E and initial tension T are obtainedm；
(3) according to as above parameter, suspension string bottom wire clamp terminal level amount of deflection △ L is obtained, △ L are equally divided into n parts
Horizontal displacement △ l, △ L=n × △ l；
(4) bottom wire clamp horizontal displacement △ l and wire Horizontal Tension T relationship when establishing suspension string deflection：
Wherein, wire Horizontal Tension after T changes for span, unit N；
L is the actual span of wire, unit m；
△ l are suspension string bottom wire clamp displacement, unit m；
TmFor wire initial level tension force, unit N；
G is wire comprehensive load, unit N/m；
β is height difference angle, unit °；
E is wire modulus of elasticity, units MPa；
A is sectional area of wire, unit mm2；
The relevant parameter of foregoing determination is substituted into, T- △ l relation formulas can be obtained；
(5) according to T- △ l relation formulas, the wire tension for often increasing a △ l is calculated；
(6) wire Horizontal Tension-T- △ l relational theory curves corresponding to span variable quantity are drawn, as shown in Figure 5；
(7) according to △ L=n × △ l and above-mentioned T- △ l relational theory curves, suspension string bottom wire clamp terminal level is obtained
Wire Horizontal Tension T under offset △ L；
And the computational methods of the orbital curve in analogue means are as follows：
(1) the fixed pulley position and selection movable pulley model are determined according to design requirement, wherein under the orbital curve
End coordinate is (0,0), and the horizontal range positioned at the fixed pulley center on orbital curve top and orbital curve bottom is a, fixed
Vertical range at the top of pulley with orbital curve bottom is b, a diameter of D of movable pulley；
(2) point of contact coordinate of the movable pulley on orbital curve is set as (x, y), and corresponding movable pulley center of circle coordinate isObtain movable pulley roll dl when each infinitesimal between relation：
Wherein,For the tangent line horizontal sextant angle at movable pulley and orbital curve contact point；
(3) establish wire tension T and wire tension simulates attached heavy GHBalanced relationship：
Wherein, θ is wire and x-axis horizontal sextant angle；
GHSimulated for wire tension attached heavy；
(4) establish wire and pull length infinitesimal dl and angleBetween relation：
(5) according to T- △ l relation formulas, with reference to 3~formula of formula 5, using Matlab software programs, calculate l-x and
L-y functional relation；
(6) functional relation according to l-x and l-y, obtains curve model x-y functional relations, complete according to the curve model
Into the drafting of orbital curve.
It is as follows in the horizontal pulling test of the enterprising row conductor of above-mentioned analogue means, its test procedure：
(1) movable pulley is placed in the bottom of track, is measured by tensiometer and records the wire tension T of the position；
(2) movable pulley is pulled, the point of contact horizontal range x value addeds that movable pulley and orbital curve are made by displacement meter are △ l
Multiple, while measured by tensiometer and record the wire tension T of the position；
(3) in kind, measure and record multiple movable pulley point of contact horizontal displacement value x and corresponding wire tension T；
(4) the T- △ l relation measured curves of wire Horizontal Tension-span variable quantity corresponding relation are drawn.
Wire tension change is calculated according to simulation method, specific Transmission Line Design condition is first depending on, takes outstanding
The string actual span in both sides that hangs down is 300m, no discrepancy in elevation, uses wire type to pass through for LGJ-300/40《Power engineering high tension transmission
Circuit design manual (second edition)》Chapter 3, the content of mechanics calculation of electrical wire, obtain the design parameter such as following table：
| Wire type | Elastic modulus E | Conductor cross-section A | Comprehensive load g | Initial tension Tm |
| Unit | MPa | mm2 | N/m | N |
| LGJ-300/40 | 73000 | 338.99 | 11.11 | 13546 |
According to simulation method step 3, it is 1m to take suspension string terminal level amount of deflection △ L, and horizontal displacement △ l are
0.025m, formula 1 is substituted into, it is as follows to obtain wire horizontal pull T- △ l relations：
T=19.126 Δs l3-2.6644Δl2+9.7386Δl+13.479
△ l increase value changes are taken, corresponding T values can be calculated, and draw out T- △ l relational theories as shown in Figure 5
Curve.
According to analogue means and corresponding orbital curve computational methods, it is 0.2m to take movable pulley diameter D, and wire tension is simulated
Attached heavy GHFor 40kN, the horizontal range a of orbital curve bottom to fixed pulley center is 2.0m, and orbital curve bottom is slided to fixed
The vertical range b at wheel top is 0.8m, by the relevant parameter and D, G of foregoing obtained T- △ l relational theory curvesH, a, b tetra-
Parameter value brings formula 3 and formula 4 into, and x-y functional relations as shown in Figure 4 are calculated by Matlab softwares.
By the x-y function relation curves by processing and exporting, the orbital curve formed in analogue means, in above-mentioned mould
Intend the horizontal pulling test of the enterprising row conductor of device, obtain the test parameters of corresponding T values and △ l values, draw out as shown in Figure 5
T- △ l relation measured curves, T- △ l relations measured curves and T- △ l relational theory curves are contrasted, it can be found that two
The similarity-rough set of curve is high, and can accurately simulate the wire tension in the case where span changes by the analogue means becomes
Change, improve the accuracy and applicability of Transmission Line Design.
In description of the present utility model, technical term " on ", " under ", "front", "rear", "left", "right", " vertical ", " horizontal stroke ",
" interior ", " outer " etc. represent that direction or position relationship are to be based on direction shown in the drawings or position relationship, are for only for ease of description
With understand the technical solution of the utility model, described above that not the utility model is limited, the utility model is also not only
It is limited to the citing of described above, the change that those skilled in the art are made in essential scope of the present utility model
Change, retrofit, increase or replace, be regarded as the scope of protection of the utility model.
Claims (4)
- A kind of 1. analogue means for being used to measure single grade of wire tension change of transmission line of electricity, it is characterised in that：The analogue means Including framework (1), the track on framework (2), the fixed pulley (3) above track are placed in, is placed on track and is rolled along track Dynamic running block (4) and the wire (5) rolled by fixed pulley traction running block, the track includes being symmetrical arranged and phase Mutually parallel left rail (21) and right rail (22), the left rail and right rail are curvilinear, the running block including left chain wheel (41), Right pulley (42) and the connecting shaft (43) for connecting left and right pulley, the race of the left chain wheel are caught in left rail and rolled along left rail, institute The race for stating right pulley is caught in right rail and rolled along right rail, and described wire one end axis connection and is led with described connect by connecting shaft Priming assembly pulley rolls, and the other end of wire is hung with weight (6) by fixed pulley external haulage gear in connecting shaft.
- 2. a kind of analogue means for being used to measure single grade of wire tension change of transmission line of electricity according to claim 1, it is special Sign is：The wire (5) of fixed pulley (3) side is connected with tensiometer (7) and displacement meter (8).
- 3. a kind of analogue means for being used to measure single grade of wire tension change of transmission line of electricity according to claim 1 or 2, its It is characterised by：The center of the connecting shaft (43) is provided with the wire locating slot of ring-type, and the end of the wire (5) is annular in shape and covers In the wire locating slot, the both sides of wire locating slot are provided with hanging wire locating slot, hang weight hanging wire (9) upper end of weight Annularly and it is sheathed in the hanging wire locating slot.
- 4. a kind of analogue means for being used to measure single grade of wire tension change of transmission line of electricity according to claim 1, it is special Sign is：The upper and lower end of the left rail (21) is respectively equipped with positioning link stopper, lower positioning link stopper, the right rail (22) Upper and lower end be respectively equipped with position block, lower positioning link stopper.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060222A (en) * | 2018-10-18 | 2018-12-21 | 湖南城市学院 | A kind of dulcimer string tension measuring device |
| CN112051282A (en) * | 2020-08-18 | 2020-12-08 | 国网山东省电力公司临沂供电公司 | Electrified X-ray flaw detection device and method for splicing sleeve of overhead transmission line |
| CN114754989A (en) * | 2022-03-09 | 2022-07-15 | 吉安易巴克电子科技有限公司 | Data line joint tensile stress detection equipment and method thereof |
| CN116929452A (en) * | 2023-07-26 | 2023-10-24 | 东北电力大学 | Experimental simulation device and method for sliding of composite cross arm wire without suspension string |
-
2017
- 2017-07-17 CN CN201720862158.9U patent/CN207036404U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060222A (en) * | 2018-10-18 | 2018-12-21 | 湖南城市学院 | A kind of dulcimer string tension measuring device |
| CN112051282A (en) * | 2020-08-18 | 2020-12-08 | 国网山东省电力公司临沂供电公司 | Electrified X-ray flaw detection device and method for splicing sleeve of overhead transmission line |
| CN112051282B (en) * | 2020-08-18 | 2023-11-28 | 国网山东省电力公司临沂供电公司 | Electrified X-ray flaw detection device and method for splicing sleeve of overhead transmission line |
| CN114754989A (en) * | 2022-03-09 | 2022-07-15 | 吉安易巴克电子科技有限公司 | Data line joint tensile stress detection equipment and method thereof |
| CN116929452A (en) * | 2023-07-26 | 2023-10-24 | 东北电力大学 | Experimental simulation device and method for sliding of composite cross arm wire without suspension string |
| CN116929452B (en) * | 2023-07-26 | 2024-03-08 | 东北电力大学 | Experimental simulation device and method for sliding of composite cross arm wire without suspension string |
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