CN100577974C - Two-tower double-circuit compact linear power transmission iron tower - Google Patents
Two-tower double-circuit compact linear power transmission iron tower Download PDFInfo
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- CN100577974C CN100577974C CN200510127473A CN200510127473A CN100577974C CN 100577974 C CN100577974 C CN 100577974C CN 200510127473 A CN200510127473 A CN 200510127473A CN 200510127473 A CN200510127473 A CN 200510127473A CN 100577974 C CN100577974 C CN 100577974C
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Abstract
The invention relates to compact double straight line electric power pylon. It adopts compact parallel double backward cam arrangement to lay conducting wire, negative protection angle to lay ground wire which can effectively reduce pylon height, increase 500kV parallel transmission line thunder resistance, running safe reliability. Compared with the conventional drum type straight line pylon, the 500kV compact double straight line can reduce steel product consumption by 30%, basal concrete consumption by 10%.
Description
Technical field
The relevant a kind of transmission facility of the present invention refers to the brand-new electric power pylon that a kind of 500 kilovolts of same tower double back transmission lines use especially.
Background technology
At present, the tangent tower of 500 kilovolts of same tower double back transmission lines uses of China is the conventional tangent tower that the three-phase conducting wire vertical arrangement is suspended on the iron tower both sides.Satisfy at the lead distance to the ground under the prerequisite of rules requirement, the height of iron tower will reach 60m-70m usually, the average 22m in shared circuit corridor.
As shown in Figure 1, existing conventional common-tower double-return 500kV line steel tower design tower height often surpasses 60m, has not only influenced anti-damage to crops caused by thunder ability, also is that the two drum type towers that return of 500kV consumed one of high reason of steel index with tower and frame in the past.33.0m exhale the common tower height of high tower all more than the 56.0m, convergence 60.0m or more than the 60.0m, adjust all convergences 1.6 or of coefficient by existing DL/T5092-1999 " 110-500kV aerial power transmission line designing technique rules " wind load greater than 1.6, by existing DL/T5092-1999 " 110-500kV aerial power transmission line designing technique rules " requirement overall height is surpassed the tower of 60.0m, will adopt by existing national regulation " loading code for design of building structures " to increase piecemeal from down to up and weighted average should be less than 1.6 value.
Therefore, the 500kV of DL/T5092-1999 issuing and implementation back when in the past carrying out SDJ3-79 is two returns the drum type towers to consume the steel index with tower and frame also higher.From engineering generally speaking, the two drum type tangent towers that return with tower and frame of 500kV are not near 60.0m, are exactly more than 60.0m.It is not to be exactly also bigger than 1.6 near 1.6 that blast is adjusted coefficient.Like this, must cause the two raisings of returning of 500kV with tower and frame use drum type straight line tower engineering body cost.As seen reduce full tower height degree, blast is adjusted coefficient, and to be controlled at 1.5 should be the feasible solution that reduces consumption steel index; And height variation factor of wind pressure also can reduce, and only this just can reduce 6-7% with the wind load that acts on the full tower.
Summary of the invention
The object of the present invention is to provide a kind of iron tower of new structure, it has realized applying on the 500kV same tower double back transmission line, make the construction of China 500kV same tower double back transmission line reach the reduction engineering construction investment, improve circuit nature transmission power, reduce the electromagnetic effect to environment, the purpose of raising line lightning resisting level.The performance of the anti-damage to crops caused by thunder of common-tower double-return 500kV compact line is better than common-tower double-return 500kV conventional type circuit, can improve the anti-damage to crops caused by thunder ability of transmission line of electricity, and is favourable to production run.
Its lightning protection properties is compared as follows table:
| The circuit pattern | Compact common-tower double-return circuit | Conventional type common-tower double-return circuit |
| Lightning withstand level (kA) | 165 | 139 |
| Trip-out rate (inferior/year. hundred kilometers) | 0.116 | 0.294 |
In addition, another purpose of the present invention is to arrange lead by adopting with tower and frame double-loop compact inverted triangle arrangement mode, reduced tower height effectively, and through leverage, internode layout to common-tower double-return and frame compact type tower, the improvement of several aspects such as optimization of the size Control of tower head, each one of cross-arm and the body of the tower gradient, 500kV of the present invention double loop compact tangent tower reduces steel consumption nearly 30% than conventional type drum type tangent tower ratio; After reducing the iron tower height, reduced the iron tower foundation active force, the base concrete consumption reduces about 10% than conventional common-tower double-return 500kV circuit.
For this reason, the present invention has adopted following technical scheme:
A kind of two-tower double-circuit compact linear power transmission iron tower, it includes body of the tower, tower head and lead, and it focuses on: this tower head comprises an individual layer cross-arm, and it is symmetrically distributed in the body of the tower both sides, two return wires are arranged in the both sides of body of the tower, and this iron tower integral body is the T font structure.
Wherein a folding arm is extended at the both ends of this cross-arm respectively downwards.
This wire arrangements mode is: arrange a loop three-phase conducting wire on the cross-arm of the both sides of body of the tower respectively, this three-phase conducting wire is compact arrangement and is triangularly arranged, wherein going up two phase conductors is placed on the cross-arm side by side, is two V-type strings, and following phase conductor is placed in the end and the body of the tower of this cross-arm folding arm, be a V-type insulator string, hung between the crosspoint of two-phase V-type string and this time phase conductor on this and hung string in one, this three-phase conducting wire V-type insulator string satisfies electric clearance requirement alternate and relatively simultaneously.
This time phase conductor V-type string is relaxed state, vertical load by in hang the string bear; During normal operation, remain two string work, a string lax in the three-phase conducting wire V-type string.
This three-phase conducting wire is formed a phase by 6 leads.
This iron tower height is between 40m-50m; Shared circuit corridor average out to 24m.
The two of the present invention and the common usefulness of engineering return with the contrast of tower drum type tower, the tower overall height than conventional type short 17.0m, improved anti-damage to crops caused by thunder ability, ground wire adopts negative shielding angle simultaneously, has also avoided the thunderbolt of around shocking; After to each controlling dimension optimal design of full tower, single basic tower weight has reduced by 27% than conventional drum type tower; The shared corridor of circuit is than the bigger 1.0m of conventional line; The tangent suspension tower root is opened occupation of land and has also been lacked one times than conventional line.
Description of drawings
Fig. 1 is the structural representation of conventional electric power pylon;
Fig. 2 is the structural representation of compact electric power pylon of the present invention;
Fig. 3 is a practical application schematic diagram of the present invention.
[figure number explanation]
1 body of the tower, 2 tower heads
21 cross-arms, 211 folding arms
22,24 times phase conductor V-types of phase conductor V-type string string on 23
Hang string in 25
The specific embodiment
For the clear structure of the present invention of your auditor is formed, and the overall operation mode, cooperate graphic being described as follows now:
500kV common-tower double-return compact type tangent tower of the present invention is to be different from a kind of brand-new tower of tower in the past.The tower head determining dimensions then is the layout pattern of lead, so the conventional common-tower double-return of China 500kV is all being used on the analysis foundation of drum type tower, the research of the arrangement of the multiple tower head of process and Technological Economy are relatively, in all multi-schemes, develop the brand-new tower technical scheme of the T font tower of individual layer cross-arm of the present invention.
Two the returning with the tower head of tower and frame compact transmission line tangent tower of this 500kV arranged, the characteristics of three characteristics of the middle term lead compact arrangement, following phase conductor V-type insulator string need satisfy the requirement of last two phase conductor electric clearances, basically form both sides and hang the T font tower that resembles English capitalization of phase conductor V-type insulator string down with the end and the body of the tower of folding arm cross-arm, two loops are arranged in the both sides of body of the tower, as shown in Figure 2: this electric power pylon includes body of the tower 1, tower head 2 and lead, it focuses on: this tower head 2 comprises an individual layer cross-arm 21, a folding arm 211 is extended at the both ends of this cross-arm respectively downwards, it is symmetrically distributed in body of the tower 1 both sides, two return wires are arranged in the both sides of body of the tower, and this iron tower integral body is the T font structure.
Wherein this wire arrangements mode is: arrange a loop three-phase conducting wire on the both sides of body of the tower 1 cross-arm 21 respectively, this three-phase conducting wire is formed a phase by 6 leads.This three-phase conducting wire is compact arrangement and is triangularly arranged, wherein going up two phase conductors 22,23 is placed on the cross-arm 21 side by side and intersection is arranged, is two V-type strings, and following phase conductor 24 is placed in the end and the body of the tower 21 of this cross-arm folding arm 211, be a V-type insulator string, hung between the crosspoint of two-phase V-type string and this time phase conductor on this and hung string 25 in one, this time phase conductor 24V type insulator string satisfies the electric clearance requirement of last two phase conductor V- type strings 22,23 simultaneously.This time phase conductor V-type string is relaxed state, vertical load by in hang string and 25 bear; During normal operation, remain two string work, a string lax in the three-phase conducting wire V-type string.
500kV Identical Double Circuit Compact Type Tower type of the present invention be primarily aimed at down the characteristics of hanging string in the phase insulator V string band, down mutually the duty of three string work in combination mechanism, various operating mode combination string, whether three strings are that indeterminate state is analyzed mutually down.The little folding arm of the load action characteristics on the T font tower cross-arm, cross-arm far-end is resisted deformation ability to torsion effect and complete each one of tower of cross-arm, with the once proof typical 500kV iron tower of recent two decades China, all done detailed comparative analysis, specific as follows:
1, the contrast of 500kV common-tower double-return compact type tangent tower and conventional common-tower double-return tangent tower, as shown in the table:
| Compact | Conventional type |
| Lead is triangularly arranged | Lead is vertical arrangement |
| Three-phase all is the V string and hangs string in the phase V string band down | Three-phase all is the string that dangles |
| The little folding arm cross-arm of cross-arm band is stressed: be subjected to bend and turned round | Cross-arm is that straight cross-arm is stressed: bent |
| 33.0 MExhale and claim high tower overall height 41.0 M | 33.0 MExhale and claim high tower overall height 58.0 M |
2, hang the string working mechanism under the compact of the present invention in the phase insulator V string band:
Twice lifting or anchor V string are all installed, and all are directly will be lifted by crane or the load of anchor passes on the cross-arm by casual labour's utensil.After the twice lifting, the V string all is relaxed state.
Generally, following phase V string is relaxed state, vertical load by in hang string and bear.Big wind-induced horizontal loading, left side be the wind comes from and born by V string left side string, and the right string of V string is lax; The wind comes from and born by the right string of V string in the right side, V string left side string is lax.No matter the wind comes from the left side or the wind comes from the right side, still vertical wind all is two string work, and is a string lax.
In particular cases, (along line direction with joint efforts) jointly because the longitudinal load of Tension Difference can guide down the phase insulator string, offsets to one side.Instantly phase V string is displaced to when being tightened up state by relaxed state, hangs the vertical load that string is born during following phase V start of string is shared, in hang string effect begin to reduce (transfer point of effect maybe can be called critical point).But this moment, the effect of longitudinal load does not also make side-play amount reach required drift angle, and when continuing skew, in hang string then by bearing whole vertical components then reduce gradually, up to because of in hang string skew, be subjected to down phase V string around the little restriction of the V string suspension centre radius of gyration around the suspension centre radius of gyration, in hang string and dwindle with the drift angle increase radius of gyration, hang in being directed at that string is lax to be withdrawed from till the load state fully, at this moment just have only following phase V to go here and there and bearing whole loads.As the essential following phase conductor Tension Difference duty of considering of structure design, phase V string was born down mutually all loads under yes.
3, the analysis of the indeterminate state of three strings mutually down:
Three strings co-operation in vertical plane is indeterminate state.Description by above-mentioned duty to various operating modes combination string is as can be seen: because phase V string is relaxed state down, all do not have the cooperative situation of three strings to take place in vertical plane during various operating mode.Phase insulator string under the guiding of the longitudinal load of Tension Difference only, when three strings offset to one side jointly, through critical point at that moment, following three strings are mutually just being shared all loads jointly, and the effect of hanging string in the moment of this state begins to reduce, following phase V string has then just begun to increase the power that need share, all is not the maximum rating of its bearing capacity.Only this in a flash because point of resultant force has left down mutually three vertical planes of going here and there hanging points, and three power are not also in a plane, thereby, it just can set up three-dimensional equilibrium equation, solves the load that hanging point is shared separately, rather than statically indeterminate problem.But prerequisite that it should be noted that it is that down phase V string must be relaxed state, and this is in the treating method of theory analysis and engineering construction, obtains test tower and the check of the 500kV compact transmission line engineering practice of having built up, moves respond well so far.
4, the folding arm on the T font tower cross-arm is resisted the aspect of distortion to the torsion effect of cross-arm and complete each one of tower:
Because constituting the cross-arm of tower head major part among the present invention is that two ends have the folding arm structure respectively, and then reversing of cross-arm produced some influences.Because down a hanging point of phase V string need hang over the end of the little folding arm of cross-arm, make cross-arm as the body of the tower of conventional tower, when phase conductor Tension Difference down, be subjected to reversing.Only this torsion load is half of a phase conductor Tension Difference.With regard to present engineering, from the distribution of phase V string power was analyzed down, longitudinal tension force was got 15% o'clock as can be seen, and the longitudinal force maximum that acts on the folding arm has only 13647N.As cross-arm being regarded as one section is holded up next body of the tower, little folding arm is exactly the cross-arm that stretches out on this body of the tower.Moment of torsion on this body of the tower will lean on the oblique material (being the oblique material on the cross-arm) on the body of the tower to resist naturally, requires body of the tower to have the tabula face of enough resistance to deformations to keep the operate as normal of its geometric system simultaneously.
In this, the cross-arm of compact type tower has just in time possessed this 2 requirements.
1) cross-arm of compact type tower has fully closed oblique material network, successfully transfer torque.
2) since structure and for install, the convenient tabula face that is provided with of operating maintenance amounts to five more than in the length of 13.4m, it is resisted deformation ability and is strengthened greatly.
The size of reversing calculated value when the following phase conductor Tension Difference from cross-arm is as can be seen: the relative displacement of the relative central axis of cross-arm cross-sectional edge has only 6mm, and being can not influence the cross-arm operate as normal.
In addition, this novel T font electric power pylon scheme has been passed through the evaluation of national departments concerned, confirm that it meets the main technical requirements of planning to build the 500kV common-tower double-return compact type circuit of establishing in the works, solved the iron tower structural shape problem of building 500kV common-tower double-return compact type circuit.It has carried out the true type tower test of tangent tower and the angle tower supporting with it, being that 500kV is two returns with tower and the test of frame compact SCZ51 tangent tower test tower, from November 12 calendar year 2001 the SCZ51 tangent tower formally open examination, comprise oblique strong wind overload 160% to November 15 calendar year 2001, whole 17 operating condition of test pass through smoothly.November 29 calendar year 2001, the SCJ51 angle tower was formally opened examination, comprised strong wind overload 150% to November 30 calendar year 2001, and whole 13 operating condition of test pass through smoothly; Its practical situations as shown in Figure 3.
Present China 500kV common-tower double-return and frame transmission line of electricity, building cost is higher, and the more single back transmission line of the anti-thunder characteristic of 500kV common-tower double-return and frame transmission line of electricity is poor, for reducing common-tower double-return and frame transmission line construction cost, improve transmission capacity, improving lightning withstand level, especially it is regional to gather at power transmission network, in limited corridor, use patented technology of the present invention, building the common-tower double-return compact type transmission line of electricity is the preferred option that solves big transmission capacity, reduction building cost, improves lightning withstand level.
As mentioned above, the invention provides a preferable novel electric power pylon structure, and relevant application, so offer the application of patent of invention in accordance with the law; Yet, above implementation and graphic shown in, be this creation preferred embodiment, be not to limit to this creation with this, be with, approximate, identical with the structure of this creation, device, feature etc. such as, all should belong to founding within purpose and the claim of this creation.
Claims (4)
1, a kind of two-tower double-circuit compact linear power transmission iron tower, it includes body of the tower, tower head and lead, it is characterized in that: this tower head comprises an individual layer cross-arm, and it is symmetrically distributed in the body of the tower both sides, two return wires are arranged in the both sides of body of the tower, and this iron tower integral body is the T font structure;
A folding arm is extended at the both ends of this cross-arm respectively downwards; This wire arrangements mode is: arrange a loop three-phase conducting wire on the cross-arm of the both sides of body of the tower respectively, this three-phase conducting wire is compact arrangement and is triangularly arranged, wherein going up two phase conductors is placed on the cross-arm side by side, is two V-type strings, and following phase conductor is placed in the end and the body of the tower of this cross-arm folding arm, be a V-type insulator string, hung between the crosspoint of two-phase V-type string and this time phase conductor on this and hung string in one, this three-phase conducting wire V-type insulator string is arranged and is satisfied electric clearance requirement alternate and relatively simultaneously.
2, two-tower double-circuit compact linear power transmission iron tower as claimed in claim 1, wherein this time phase conductor V-type string is relaxed state, vertical load by in hang the string bear; During normal operation, remain two string work, a string lax in the three-phase conducting wire V-type string.
3, two-tower double-circuit compact linear power transmission iron tower as claimed in claim 1, wherein this three-phase conducting wire is formed a phase by 6 leads.
4, two-tower double-circuit compact linear power transmission iron tower as claimed in claim 1, wherein this iron tower height is between 40m-50m; Shared circuit corridor average out to 24m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200510127473A CN100577974C (en) | 2005-12-06 | 2005-12-06 | Two-tower double-circuit compact linear power transmission iron tower |
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| CN200510127473A CN100577974C (en) | 2005-12-06 | 2005-12-06 | Two-tower double-circuit compact linear power transmission iron tower |
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| CN100577974C true CN100577974C (en) | 2010-01-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102561783A (en) * | 2012-01-31 | 2012-07-11 | 浙江省电力设计院 | 500kV vertical-arrangement symmetrical double-circuit compact tangent tower |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102409888B (en) * | 2010-09-25 | 2014-04-02 | 国家电网公司 | Improved cat-head type tower |
| CN109629899A (en) * | 2018-11-29 | 2019-04-16 | 中国电力科学研究院有限公司 | It is a kind of for exchanging 750kV with the device of four circuit power transmission tower of tower |
| CN109961618B (en) * | 2019-03-22 | 2020-09-01 | 国网湖南省电力有限公司 | Composite insulator V-shaped arrangement anti-string-falling treatment and warning method |
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2005
- 2005-12-06 CN CN200510127473A patent/CN100577974C/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102561783A (en) * | 2012-01-31 | 2012-07-11 | 浙江省电力设计院 | 500kV vertical-arrangement symmetrical double-circuit compact tangent tower |
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| CN1978846A (en) | 2007-06-13 |
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