CN104993424A - Sag observation method for power transmission line engineering construction - Google Patents
Sag observation method for power transmission line engineering construction Download PDFInfo
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- CN104993424A CN104993424A CN201510399855.0A CN201510399855A CN104993424A CN 104993424 A CN104993424 A CN 104993424A CN 201510399855 A CN201510399855 A CN 201510399855A CN 104993424 A CN104993424 A CN 104993424A
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Abstract
The invention relates to a sag observation method for power transmission line engineering construction. A mechanical model of sag control by a tension force in a tension state is established and applied forces on overhead lines of all towers are calculated based on formulas; and according to to-be-tightened-up zone, an observation grade is determined and a wire tightening-up field is arranged, a tension force value displayed by a tightening-up end tension measurement device corresponding to the designed sag by the observation grade is calculated, winching is started, the tension measurement device is observed; and the sag is controlled. According to the invention, from the perspective of the relation of the tension force, the stress, and the sag, the tension force is introduced into the overhead line tightening construction, so that the circuit stress control becomes simple and direct. Meanwhile, a problem that the sag can not be observed from the top or bottom of the overhead line tower at special areas like the high mountain areas can be solved.
Description
Technical field
A kind of work transmission line construction of the present invention sag observation method, relates to transmission line monitoring field.
Background technology
The method that conventional observation overhead transmission line is led, ground wire sag is conventional, generally have abnormal method, etc. regular way, preset angle configuration and look squarely method four kinds.Ordinary priority such as to select at regular way or the abnormal method.When being subject to the regular ways such as objective condition restriction can not adopt or abnormal method, preset angle configuration can be selected.When only can not use above-mentioned three kinds of methods, just adopt and look squarely method.Before observation sag, circuit plane cross section should be consulted, understand landform and sag etc. situation, suitable sag observation method is selected in conjunction with actual conditions, and according to overhead line structures position detail list, and by technical data such as the falling temperature method conducting wire sag curves (this curve to provide the sag of corresponding ruling span by different temperatures) counting primary elongation, calculate corresponding observation data, finally observe sag (observed temperature during observation sag should meet the temperature representing wire surrounding air).
, 1) the regular way observation sag such as:
Etc. regular way also known as parallelogram method, it is the most frequently used observation sag method.When condition is permitted, the regular way such as preferentially should to select.Concrete operation method: on adjacent two shaft towers of observation shelves, measure distance sag f colligation sag plate downwards by overhead wire hitch point is each or compass is set after survey station end draws the marking, then directly use visual observation at the sag plate of observation end, or observe with compass; When above-mentioned span is from f, a temperature value can be estimated according to the temperature on stringing same day, select f with this temperature condition, if during temperature Change, should colligation sag plate again; Observation sag time, make the line of plane on two sag plates and overhead wire minimum point tangent, namely reach designing requirement.
2), different regular way observation sag:
When the discrepancy in elevation is larger when between the overhead wire hitch point observing shelves, in order to ensure that sight line point of contact is near sag minimum point, abnormal method can be adopted to observe sag.Concrete operation step: sag plate lashing location, shelves two ends is not contour carries out sag observation, other equal regular ways in observation.
3), preset angle configuration observation sag:
The advantage of preset angle configuration observation sag is: for large span, fuzzyyer with visual observation overhead wire point of contact, more clear with theodolite, it is more accurate to observe.With etc. regular way, abnormal method observation sag often need operating personnel step on bar observation, preset angle configuration directly at ground observation, can compare safe ready.Preset angle configuration observation sag, due to the difference of the putting position of theodolite, is divided into three kinds of situations: span end angle method, out-span angle method and span end angle method.Concrete operation step: determine theodolite position, and check and observe the discrepancy in elevation between grade overhead wire hitch point; Calculate sag observation angle at different temperatures; Adjustment stringing sag, makes the sight line of the axis of overhead wire and theodolite tangent; Once should check immediately after overhead wire hanging wire, observed result be inserted sag record sheet.
4) method observation sag, is looked squarely:
Look squarely method observation sag time preset angle configuration observation sag a kind of special shape.Both identical points are all use theodolite observation sag, but the former view angle is 0 °, and the view angle of the latter is certain special angle adapted with sag.In erection of elevated power lines, the regular ways such as prioritizing selection, abnormal method and preset angle configuration is answered to observe sag.If when above-mentioned three kinds of methods implement difficulty or do not allow, can select and look squarely method observation sag.Method of looking squarely generally is applicable to following condition: extreme terrain, and overhead wire sag is comparatively large, when sag is more than the twice of shaft tower height; Utilize preset angle configuration often because sight line point of contact is excessively near apart from hitch point, when can not guarantee sag quality.
The defect of traditional sag observation method has three:
(1): on the Special section overhead transmission line tower such as high mountain jungle, do not observe sag under tower, fail safe overhead wire being run to stress brings challenge, conventional method is no longer applicable.
(2): the essence of traditional sag observation method directly observes sag this directly observes this indirect parameter of sag, and the essence of sag observation realizes the design load that circuit runs stress, the sag of so traditional method observation is present in error with design stress value when being transformed into stress
(3): traditional method is comparatively worked hard for technical staff, in the unaccommodated situation of preset angle configuration, technical staff needs to climb up shaft tower observation sag, if do not have suitable position can cause larger error, also has certain potential safety hazard for technical staff simultaneously.
Summary of the invention
For above-mentioned defect, the invention provides a kind of work transmission line construction sag observation method, from tension force, relation between stress and sag, tension force is incorporated in overhead wire Construction of Tension Stringing, make control circuit stress more simple, directly; Solve simultaneously on the Special section overhead transmission line towers such as high mountain, under tower, do not observe a difficult problem for sag.
The technical solution adopted in the present invention is:
A kind of work transmission line construction sag observation method, sets up the mechanical model that tension force under stringing state controls sag, and the overhead wire at each shaft tower place is stressed variously to be calculated by following:
T
1＝T
0+wh
0
F
1＝εT
1＝ε(T
0+wh
0)
T
2＝εF
1+wh
1＝ε
2(T
0+wh
0)+wh
1(1)
.
.
.
T
e＝T
n+wh
n＝ε
n(T
0+wh
0)+ε
n-1wh
1+…wh
n
H in formula
n---the n-th grade of overhead wire suspension point discrepancy in elevation (m), when the hitch point of stringing side is higher, h
njust get, otherwise get negative, get 0 when both sides suspension point is contour;
The linear mass of w---overhead wire, N/m;
The overall drag coefficient of ε---overhead wire and coaster, (1.012-1.015);
N---observation shelves are to stringing end coaster quantity;
T
e---stringing end pulling equipment tractive effort, N;
T
n---the tractive effort of n-th grade of releasing pulley porch, N;
F
n---the tractive effort in n-th grade of releasing pulley exit, N;
If when the discrepancy in elevation great disparity of each shelves is little, its average discrepancy in elevation desirable, therefore can be reduced to:
According to plan stringing section, determine to observe shelves, arrange stringing field, the tension value that stringing end corresponding to observation shelves design sag surveys tensioner display is calculated by formula (1) or formula (2), start strand mill, observe and survey tensioner, control sag.
Described survey tensioner comprises pulling force sensor, and pulling force sensor is linked in the circuit of overhead wire stringing state, by the change of its tension value, controls the tension force in stringing process, and then control circuit sag.
Described pulling force sensor be linked into Construction of Tension Stringing wire clamp and strand grind between steel cable.
A kind of work transmission line construction of the present invention sag observation method, from tension force, relation between stress and sag, tension force is incorporated in overhead wire Construction of Tension Stringing, be about to survey tensioner be linked into Construction of Tension Stringing wire clamp and strand grind between steel cable, the tension force in stringing process is controlled by the change of its tension value, and then control circuit sag.Make control circuit stress more simple, direct, solve simultaneously on the Special section overhead transmission line towers such as high mountain, under tower, do not observe a difficult problem for sag.
Accompanying drawing explanation
Fig. 1 is the design sketch that tension force of the present invention controls sag;
Wherein: 1-twists mill, 2-pulling force sensor, line more than 3-, 4-pulley, 5-observes shelves." → " represents stringing direction.
Fig. 2 is the mechanical model figure that under stringing state of the present invention, tension force controls sag.
Embodiment
A kind of work transmission line construction sag observation method,
1), in overhead transmission line engineering, the relation of overhead transmission line sag and stress, tension force is generally embodied by two formula below:
Wherein f is sag, and l is span, g for leading, ground wire than carry, σ is stress, and γ is that unit length is led, the deadweight of ground wire, is Horizontal Tension, sag can be converted to tension force according to formula.
2), the operation principle of pulling force sensor 2 is: utilize the load-sensing unit that the strain of flexible member or strain reflection form certain proportionate relationship with external force suffered by it and make.According to its feature, pulling force sensor 2 is linked in the circuit of overhead wire stringing state, controls the tension force in stringing process by the change of its tension value, and then control circuit sag.According to the relation of line length and sag, the change of small line length can cause the change of larger sag, and wire clamp and the strand that therefore pulling force sensor 2 can be linked into Construction of Tension Stringing are ground between steel cable.Such design can ensure that pulling force sensor 2 is all the time in staff's observation scope in sag observation process.
3), tension force controls the concrete thought of sag as shown in Figure 1: select observation shelves 5 according to plan stringing section, the wire clamp and the strand that pulling force sensor 2 are linked into Construction of Tension Stringing are ground between steel cable, set up the trailer system be made up of strand mill 1, pulling force sensor 2, strand mill steel cable and wire clamp, wire clamp is connected remaining line 3, startup strand mill 1, slowly tightens up strand and grinds steel cable, and observation shelves are led, ground wire is slowly promoted by pulley 4, observation pulling force sensor 2 shows data, controls sag and arrives design load.
4), the theoretical formula of device for measuring force control observation shelves design stress:
The stringing operating mode of stringing section is intended based on actual work transmission line, consider each span and suspension point discrepancy in elevation great disparity larger, and consider the impact of releasing pulley coefficient of friction, set up the mechanical model that tension force under stringing state controls sag, the overhead wire at each shaft tower place is stressed variously to be calculated by following:
T
1＝T
0+wh
0
F
1＝εT
1＝ε(T
0+wh
0)
T
2＝εF
1+wh
1＝ε
2(T
0+wh
0)+wh
1(2)
.
.
.
T
e＝T
n+wh
n＝ε
n(T
0+wh
0)+ε
n-1wh
1+…wh
n
H in formula
n---the n-th grade of overhead wire suspension point discrepancy in elevation (m), when the hitch point of stringing side is higher, h
njust get, otherwise get negative, get 0 when both sides suspension point is contour;
The linear mass of w---overhead wire, N/m;
The overall drag coefficient of ε---overhead wire and coaster, (1.012-1.015);
N---observation shelves are to stringing end coaster quantity;
T
0---observation shelves Horizontal Tension, N;
T
e---stringing end pulling equipment tractive effort, N;
T
n---the tractive effort of n-th grade of releasing pulley porch, N;
F
n---the tractive effort in n-th grade of releasing pulley exit, N;
If when the discrepancy in elevation great disparity of each shelves is little, its average discrepancy in elevation desirable, therefore can be reduced to:
5), method of operation: determine to observe shelves according to plan stringing section, arrange stringing field, the tension value observing stringing end device for measuring force corresponding to shelves design sag show is calculated by formula (2) or formula (3), start strand mill 1, observe device for measuring force, by formula (2) or formula (3), the tension value that pulling force sensor 2 shows can control observation shelves Horizontal Tension, by formula (1), observation shelves Horizontal Tension can control observation shelves sag.
Application example:
Have a plan tension stringing section, observation span tension stringing section is through 6 base shaft towers, and every base shaft tower hangs a releasing pulley, and observation shelves design tension force is 15000N, wire suspension point discrepancy in elevation h
0h
655m, 43m, 46m, 43m, 42m, 51m, the discrepancy in elevation respectively
the weight w=14.6N/m of conductor, coefficient of friction resistance ε=1.014 of wire and coaster, calculate the tension value of stringing end manipulation by formula (2):
T
e＝1.014
6×(15000+14.6×55)+1.014
5×14.6×43+1.014
4×14.6×46+1.014
3×14.6×43+1.014
2×14.6×42+1.014
1×14.6×51＝20815.7N
The tension value of stringing end manipulation is calculated by formula (3):
Known by example calculation, because formula (2) calculates comparatively complicated, if when the discrepancy in elevation great disparity of each shelves of transmission line plan stringing section is little, directly engineering demand can be met with formula (3).
Claims (3)
1. a work transmission line construction sag observation method, is characterized in that,
Set up tension force under stringing state and control the mechanical model of sag, the overhead wire at each shaft tower place is stressed variously to be calculated by following:
T
1＝T
0+wh
0
F
1＝εT
1＝ε(T
0+wh
0)
T
2＝εF
1+wh
1＝ε
2(T
0+wh
0)+wh
1(1)
.
.
.
T
e＝T
n+wh
n＝ε
n(T
0+wh
0)+ε
n-1wh
1+...wh
n
H in formula
n---the n-th grade of overhead wire suspension point discrepancy in elevation (m), when the hitch point of stringing side is higher, h
njust get, otherwise get negative, get 0 when both sides suspension point is contour;
The linear mass of w---overhead wire, N/m;
The overall drag coefficient of ε---overhead wire and coaster, (1.012-1.015);
N---observation shelves are to stringing end coaster quantity;
T
e---stringing end pulling equipment tractive effort, N;
T
n---the tractive effort of n-th grade of releasing pulley porch, N;
F
n---the tractive effort in n-th grade of releasing pulley exit, N;
If when the discrepancy in elevation great disparity of each shelves is little, its average discrepancy in elevation desirable, therefore can be reduced to:
According to plan stringing section, determine to observe shelves, arrange stringing field, the tension value that stringing end corresponding to observation shelves design sag surveys tensioner display is calculated by formula (1) or formula (2), start strand mill, observe and survey tensioner, control sag.
2. a kind of work transmission line construction sag observation method according to claim 1, it is characterized in that, described survey tensioner comprises pulling force sensor (2), pulling force sensor (2) is linked in the circuit of overhead wire stringing state, by the change of its tension value, control the tension force in stringing process, and then control circuit sag.
3. a kind of work transmission line construction sag observation method according to claim 1, is characterized in that, described pulling force sensor (2) is linked into the wire clamp of Construction of Tension Stringing and strand is ground between steel cable.
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| CN105692484A (en) * | 2016-04-27 | 2016-06-22 | 湖南科技大学 | Portable winching machine tractive force telemetering device |
| CN107358020A (en) * | 2017-05-31 | 2017-11-17 | 国网江西省电力公司电力科学研究院 | A kind of excessive distribution wire stringing length calculation method of sag |
| CN108182305A (en) * | 2017-12-15 | 2018-06-19 | 河南送变电建设有限公司 | A kind of Method for Accurate Calculation of tension stringing dynamic analog |
| CN108362207A (en) * | 2018-02-28 | 2018-08-03 | 成都信息工程大学 | A kind of sag of conductor and ground wire measuring device |
| CN109580067A (en) * | 2018-10-30 | 2019-04-05 | 国网湖北省电力有限公司中超建设管理公司 | One kind is based on pinpoint ultra-high-tension power transmission line construction stringing method for early warning |
| CN109802332A (en) * | 2018-12-26 | 2019-05-24 | 安徽送变电工程有限公司 | A kind of method that grounded-line stringing controls sag of conductor and ground wire in the process |
| CN110906871A (en) * | 2019-11-29 | 2020-03-24 | 河南送变电建设有限公司 | Method for observing and adjusting lead through gear side sag |
| CN114112152A (en) * | 2020-08-27 | 2022-03-01 | 电力规划总院有限公司 | Overhead line stress temperature-changing compensation method and device and storage medium |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105692484A (en) * | 2016-04-27 | 2016-06-22 | 湖南科技大学 | Portable winching machine tractive force telemetering device |
| CN107358020A (en) * | 2017-05-31 | 2017-11-17 | 国网江西省电力公司电力科学研究院 | A kind of excessive distribution wire stringing length calculation method of sag |
| CN107358020B (en) * | 2017-05-31 | 2020-08-11 | 国网江西省电力公司电力科学研究院 | Method for calculating line tightening length of distribution network wire with overlarge sag |
| CN108182305A (en) * | 2017-12-15 | 2018-06-19 | 河南送变电建设有限公司 | A kind of Method for Accurate Calculation of tension stringing dynamic analog |
| CN108362207A (en) * | 2018-02-28 | 2018-08-03 | 成都信息工程大学 | A kind of sag of conductor and ground wire measuring device |
| CN109580067A (en) * | 2018-10-30 | 2019-04-05 | 国网湖北省电力有限公司中超建设管理公司 | One kind is based on pinpoint ultra-high-tension power transmission line construction stringing method for early warning |
| CN109580067B (en) * | 2018-10-30 | 2021-07-20 | 国网湖北省电力有限公司中超建设管理公司 | High-voltage transmission line construction line tightening early warning method based on accurate positioning |
| CN109802332A (en) * | 2018-12-26 | 2019-05-24 | 安徽送变电工程有限公司 | A kind of method that grounded-line stringing controls sag of conductor and ground wire in the process |
| CN110906871A (en) * | 2019-11-29 | 2020-03-24 | 河南送变电建设有限公司 | Method for observing and adjusting lead through gear side sag |
| CN110906871B (en) * | 2019-11-29 | 2021-08-03 | 河南送变电建设有限公司 | Method for observing and adjusting lead through gear side sag |
| CN114112152A (en) * | 2020-08-27 | 2022-03-01 | 电力规划总院有限公司 | Overhead line stress temperature-changing compensation method and device and storage medium |
| CN114112152B (en) * | 2020-08-27 | 2023-05-05 | 电力规划总院有限公司 | Overhead line stress variable temperature compensation method, device and storage medium |
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