CN106049959B - Cross arm and strain tower - Google Patents

Cross arm and strain tower Download PDF

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Publication number
CN106049959B
CN106049959B CN201610594229.1A CN201610594229A CN106049959B CN 106049959 B CN106049959 B CN 106049959B CN 201610594229 A CN201610594229 A CN 201610594229A CN 106049959 B CN106049959 B CN 106049959B
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CN
China
Prior art keywords
arm
cross
extension device
tower
tower body
Prior art date
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Active
Application number
CN201610594229.1A
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Chinese (zh)
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CN106049959A (en
Inventor
马斌
邱勇
郁杰
李德权
王青占
王兵
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Shenma Electric Power Engineering Co ltd
Original Assignee
Jiangsu Shemar Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Shemar Electric Co Ltd filed Critical Jiangsu Shemar Electric Co Ltd
Priority to CN201610594229.1A priority Critical patent/CN106049959B/en
Publication of CN106049959A publication Critical patent/CN106049959A/en
Priority to AU2017304793A priority patent/AU2017304793B2/en
Priority to US16/320,346 priority patent/US11283254B2/en
Priority to PCT/CN2017/093791 priority patent/WO2018019180A1/en
Priority to BR112019001514-0A priority patent/BR112019001514B1/en
Priority to KR1020197005544A priority patent/KR102163507B1/en
Priority to JP2019504130A priority patent/JP7012069B2/en
Priority to ES17833483T priority patent/ES2958599T3/en
Priority to CA3032316A priority patent/CA3032316C/en
Priority to RU2019104467A priority patent/RU2728638C1/en
Priority to EP17833483.5A priority patent/EP3492674B1/en
Priority to SA519400964A priority patent/SA519400964B1/en
Priority to ZA2019/01149A priority patent/ZA201901149B/en
Application granted granted Critical
Publication of CN106049959B publication Critical patent/CN106049959B/en
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04HBUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H12/00Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04HBUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H12/00Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
    • E04H12/24Cross arms

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Insulators (AREA)

Abstract

The invention discloses a cross arm for a strain tower, which comprises a tower body, wherein one end of the cross arm is connected to the tower body, one end of the cross arm, which is far away from the tower body, is a free end and is used for connecting a lead, the free end comprises an end part connecting piece and a jumper wire device, and the jumper wire device is horizontally arranged on the end part connecting piece and is used for hanging a jumper wire. The jumper device is horizontally arranged on the end connecting piece, so that the jumper device cannot occupy the space in the vertical direction, the space between conductor layers can be reduced, and the tension insulator and the complex hardware connection can be cancelled, so that the size of the tower head of the tension tower can be reduced, the structure is simplified, and the cost is reduced.

Description

A kind of cross-arm and anchor support
Technical field
The present invention relates to a kind of power transmission and transforming equipment, specifically a kind of cross-arm and anchor support.
Background technique
In overhead transmission lines, power transmission tower plays the role of supporting conducting wire, particularly by being fixed on power transmission tower Cross arm support conducting wire, specific connection type is that conducting wire is hung over to the free end of cross-arm.Anchor support is generally used for bearing uneven Weigh tension, and usually the power on conducting wire is transmitted on tower body by strain insulator-string.Anchor support includes linear tension tower, angle tower and end Head tower, can bear the horizontal loading led, ground wire generates, and anchor support two sides conducting wire needs to be connected with wire jumper.
Referring to Fig. 1, in traditional anchor support 10, need to carry out wire jumper using strain insulator string 1 and related fitting, it is resistance to Insulator chain 1 and using for fitting make the vertical spacing between cross-arm 2 very big, and make tower head 3 structure is complicated, size Larger, maintenance and installation are inconvenient, so that anchor support 100 is at high cost, conductor load effect and tower head wind load are larger, and tower body weight Amount is big.
Summary of the invention
In view of the deficiencies of the prior art, an object of the present invention is to provide a kind of cross-arm, and the cross is used on anchor support Load support conducting wire can cancel the fitting connection of strain insulator and complexity, reduce conducting wire interlamellar spacing, can reduce the tower head of anchor support Size simplifies structure, reduces cost.
To achieve the above object, the technical solution adopted in the present invention is as follows: a kind of cross-arm, is used for anchor support, described resistance to Opening tower includes tower body, and one end of the cross-arm is connected on the tower body, and the one end of the cross-arm far from the tower body is freely End is used for connecting wire, and the free end setting end coupling and bridle wire apparatus, the bridle wire apparatus are horizontally set on described On end coupling, for mounting wire jumper.
Bridle wire apparatus is horizontally disposed on above-mentioned end coupling, then the bridle wire apparatus will not occupy the sky on vertical direction Between, conducting wire interlamellar spacing can be reduced, and the fitting connection of strain insulator and complexity can be cancelled, therefore anchor support can be reduced Tower head size, simplify structure, reduce cost.
Preferably, the bridle wire apparatus is composite post insulator, and described composite post insulator one end connects the end Portion's connector, the other end mount the wire jumper.Composite post insulator is set by above-mentioned bridle wire apparatus, cross-arm electricity can be optimized ?.
Preferably, the composite post insulator mounts the wire jumper by connection gold utensil.Connection is facilitated to install in this way.
Preferably, the anchor support is angle tower, and the end coupling is also connected with extension device, in the projection of horizontal plane In, the extension device is stretched out from the end coupling, and the conducting wire is connected on the extension device, the extension device with it is described The angle of the middle line of cross-arm is greater than the angle of the middle line of the conducting wire and the cross-arm.
There are minimum electric clearance requirement, this electric clearance and conducting wire to tower body in angle tower, between conducting wire and tower body Most short space length it is related, the smallest electric clearance, which is avoided that, to be caused electrical breakdown and ensures personal safety.The present invention is in level In the projection in face, above-mentioned extension device is stretched out from above-mentioned free end along parallel or direction far from above-mentioned tower body, and the two of tower body two sides The distance between mounting point of root conducting wire can increase, and then can increase the distance between conducting wire and tower body, i.e., do not changing cross-arm The electric clearance between conducting wire and tower body is increased in the case where length.
Preferably, the extension device is respectively set in the two sides of the end coupling.Two conducting wires of tower body two sides can It is articulated on the extension device of end coupling two sides respectively, increases the distance between conducting wire and tower body.
Preferably, an extension device, two conducting wires point of tower body two sides are set on the end coupling It is not connected to the both ends of the extension device.Above-mentioned extension device can be mounted in an entirety of above-mentioned end coupling, only need This is whole fixed with free end.
Preferably, at least one reinforcer is provided on the extension device.The setting of reinforcer can increase extension device Intensity and structural stability.
Preferably, at least one described reinforcer connects the extension device and the end coupling.Reinforcer and extension Part and end coupling can form a stable triangular structure, further increase the intensity of extension device.
Preferably, the cross-arm is compound cross-arm.
In view of the deficiencies of the prior art, the second object of the present invention is to provide a kind of anchor support, anchor support includes above-mentioned tower Body and above-mentioned cross-arm.The tower head size of the anchor support is smaller, saves material cost and easy for installation.
Detailed description of the invention
Fig. 1 is the stereoscopic schematic diagram of anchor support 10 in the prior art;
Fig. 2 is the stereoscopic schematic diagram of the angle tower 100 of the embodiment of the present invention one;
Fig. 3 is the stereoscopic schematic diagram of the angle tower 200 of the embodiment of the present invention two;
Fig. 4 is the amagnified partial perspective schematic diagram of Fig. 3;
Fig. 5 is the top view of the angle tower 300 of the embodiment of the present invention three;
Fig. 6 is the partial enlargement diagram of Fig. 5.
Specific embodiment
According to requiring, a specific embodiment of the invention will be disclosed here.It is to be understood, however, that described herein Embodiment be only typical example of the invention, can be presented as various forms.Therefore, what is disclosed here is specific thin Section is not to be considered as limiting, and is merely possible to the basis of claim and as instructing those skilled in the art Representative basis of the invention is differently applied in any appropriate mode in practice, including using described herein various Feature simultaneously combines the feature that may do not disclose clearly here.
Embodiment one:
As shown in Fig. 2, in the present embodiment, angle tower 100 is used for dual loop transmission line, angle tower 100 includes tower body 101, it is provided with six roots of sensation cross-arm 110 on angle tower 100, is respectively used to connection three-phase conducting wire.One end of cross-arm 110 is connected to tower On body 101, the one end of cross-arm 110 far from tower body 101 is free end, is used for connecting wire 103.The free end of cross-arm 110 is arranged End coupling 111 and bridle wire apparatus 120, and bridle wire apparatus 120 is horizontally set on end coupling 111, for mounting Wire jumper 102.The setting of bridle wire apparatus 120 in the present embodiment is multiple instead of strain insulator string in the prior art and its correlation Miscellaneous fitting connection structure reduces the vertical distance between each phase cross-arm, and then reduces the tower head size of angle tower 100, The material of tower body 101 is saved, simplifies structure, reduces cost.
Specifically, tower body 101 can use lattice steel tower, it is also possible to the body of rod or composite material pole tower etc. The Transmission Tower of other forms.In the present embodiment, bridle wire apparatus 120 includes a composite post insulator 121, this is compound Support insulator 121 includes the full skirt of internal plug and mandrel outer, and plug is by glass fiber impregnated epoxy resin pultrusion; The material of full skirt is high-temperature silicon disulfide rubber, by being injection moulded in mandrel outer overall vacuum.The composite post insulator 121 Both ends are the flanges 122 of mucilage binding, mount wire jumper 102 for connecting end coupling 111 or wire clamp fitting.
As shown in Fig. 2, in the present embodiment, the flange 122 and end coupling of 121 one end of composite post insulator 111 connections, the modes such as can specifically be bolted, weld and being attached, and the composite post insulator 121 is connected by end 111 horizontal direction of part stretches out setting far from the direction of tower body 101, directly mounts wire jumper 102 on the flange 122 of the other end.Wire jumper 102 Middle part is articulated on composite post insulator 121, and the corner conducting wire 103 of the both ends connection cross-arm two sides of wire jumper 102 is achieved that Conducting wire connection.
Traditional strain insulator string is articulated in the end of cross-arm, is vertically arranged between adjacent two-phase cross-arm, and this The setting of composite post insulator 121 can ban strain insulator string in invention.Since composite post insulator 121 is horizontally disposed On end coupling 111, composite post insulator 121 itself will not occupy vertical between neighbouring different phase cross-arms Distance.In vertical plane, wire jumper 102 also only has the arc sag of small radian.So not needing to set between the adjacent cross-arm of two-phase up and down Biggish vertical spacing is set, when meeting electrical performance demands, can be arranged more between the phase three-phase cross-arm of upper, middle and lower It is compacter, keep the tower head size of angle tower 100 smaller, to simplify structure, reduces cost.
In the present embodiment, every phase cross-arm 110 of angle tower 100 includes composite post insulator 121, it is clear that corner Can also only have a phase on tower 100 or two-phase cross-arm 100 includes composite post insulator 121.When angle tower 100 is that single loop is defeated When electric line or more multiple loop transmission line, it is only necessary to which the cross-arm 110 of corresponding number is set according to actual condition.In addition, When anchor support is linear tension tower or terminal tower, identical bridle wire apparatus 120 is also used, it is only necessary to set according to actual use situation Conducting wire 103 is set, details are not described herein.Bridle wire apparatus 120 can not also use composite post insulator 121, but use The insulating part of other forms is used for tie jumper 102, as long as being able to satisfy actual operation requirements.
As shown in Fig. 2, being also connected with an extension device 112 on end coupling 111, in the projection of horizontal plane, extend Part 112 is stretched out from end coupling 111, and two conducting wires 103 of tower body two sides are connected to the both ends of extension device 112.At this In embodiment, extension device 112 is horizontally set on end coupling 111, and vertical with composite post insulator 121, extension device 112 are greater than the angle of conducting wire 103 with the middle line of cross-arm 112 with the angle of the middle line of cross-arm 110.
In the present embodiment, the angle of conducting wire 103 and 110 middle line of cross-arm is 60 °, extension device 112 and 110 middle line of cross-arm Angle is 90 °.The setting of extension device 112 is equivalent to the virtual point of intersection for extending the ipsilateral two corners conducting wire 103 of tower body 101, because Distance of this conducting wire 103 apart from tower body 101 increases, and conducting wire 103 and tower body can be met in the case where not changing 110 length of cross-arm Electric clearance between 101 avoids cross-arm 110 too long.
In the present embodiment, extension device 112 is to be horizontally set on end coupling 111, therefore can directly use extension device 112 make comparisons with 110 middle line angle of cross-arm, it is apparent that extension device 112 can also not exclusively be located in horizontal plane, extension device 112 An angle can be deviated in vertical plane, as long as extension device 112 and the angle of 110 middle line of cross-arm are big in the projection of horizontal plane In the angle of ipsilateral conducting wire 103 and 110 middle line of cross-arm.
In the present embodiment, 111 one end of end coupling is sleeve, is glued with cross-arm 110;One end is that connecting plate (does not show Out), it is connected and fixed with extension device 112.End coupling 111 is not inventive point of the invention, as long as end coupling 111 meets Can be fixed with extension device 112, details are not described herein.In addition the connection type of extension device 112 and conducting wire 103 is also not hair Bright inventive point is to be mounted by wire clamp generally in the art, as long as can be realized the connection of conducting wire 103 and extension device 112 i.e. It can.
Embodiment two:
As shown in figure 3, the angle tower 200 of second embodiment of the invention and the angle tower 100 of first embodiment are essentially identical, The difference is that composite post insulator 221 mounts wire jumper 202 by connection gold utensil 230.
Specifically, as shown in figure 4, connecting hole 223 is arranged on the flange 222 of 221 end of composite post insulator, pass through company It connects hole 223 and is connected with connection gold utensil 230, at least two wire clamps 231 are set in connection gold utensil 230, at least two wire clamps 231 can press from both sides Hold wire jumper 202.In the present embodiment, wire clamp 231 and connection gold utensil 230 can use any appropriate existing construction, as long as energy Enough to realize connection, details are not described herein.
Can also be arranged between connection gold utensil 230 and flange 222 regulating part 232 for adjust connection gold utensil 230 with it is compound The distance between support insulator 221 is to adapt to the demands of different operating conditions.Regulating part 232 is strip plate, is set along its longitudinal direction Set multiple through-holes separately, by connection gold utensil 230 and different through-hole thereon be attached i.e. adjustable connection gold utensil 230 with The distance between composite post insulator 221.Certainly, regulating part 232 can also use other forms, such as regulating part 232 and even It connects one in fitting 230 end and is provided with screw rod, another end is provided with screw thread compatible with the screw rod, screw rod It screws on screw thread and the two screwing length is adjustable, so that precession different length realizes adjusting on screw thread by screw rod.
Embodiment three:
As shown in Figure 5 and Figure 6, in the present embodiment, the angle tower 300 of third embodiment of the invention and first embodiment Angle tower 100 is essentially identical, the difference is that cross-arm 310 is the compound cross-arm of V-shape, the opening of V-shape connects tower body 301, should The compound cross-arm of V-shape includes end coupling 311, extension device 312 and bridle wire apparatus 320 in V word apex.Extension device 312 divides The two sides of end coupling 311 are not set, and bridle wire apparatus 320 is horizontally set on end coupling 311.
Cross-arm 310 includes two composite cross-arm insulators 313, and each composite cross-arm insulator 313 includes 314 He of insulation tube Silicon rubber umbrella skirt 315 outside insulation tube 314 can fill SF in insulation tube 3146Equal insulating gas, can also be with filled polyurethane Foam.Two composite cross-arm insulators 313 are fixed together in V-shape apex by end coupling 311.
Two extension devices 312 are separately positioned on the two sides of end coupling 311, and two conducting wires 303 of corner mount respectively On two extension devices 312.In the present embodiment, the angle of conducting wire 303 and 310 middle line of cross-arm is 50 °, extension device 312 and cross The angle for carrying on a shoulder pole 310 middle lines is 70 °.The setting of extension device 312 is equivalent to the void for extending the ipsilateral two corners conducting wire 303 of tower body 301 Quasi- crosspoint increases so that being articulated in distance of the conducting wire 303 on cross-arm 310 apart from tower body 301 by extension device 311, full Avoid cross-arm 310 too long in the case where sufficient electric insulation distance.
In addition, being additionally provided with two reinforcements in the free end of cross-arm 310, this two reinforcements includes oblique 316 He of part Auxiliary member 317, oblique part 316 form a V-structure with extension device 312, i.e., the end of oblique part 316 and extension device 312 is solid Formation V-shaped vertex, the other end of oblique part 316 on a connecting plate 318 is scheduled on to be fixed on end coupling 311.It is oblique The setting of part 316 increases the rigidity and intensity of extension device 312.Auxiliary member 317 connects oblique part 316 and extension device 312, into one Step strengthens the V-shape structure that oblique part 316 and extension device 312 are formed, that is, further increases the rigidity of extension device 312 and strong Degree.
Due to the use of extension device 312, avoid that cross-arm 310 is too long, so being provided with 300 energy of angle tower of cross-arm 310 The ungratified situation of electric clearance between conducting wire 303 is avoided, and light weight, line corridor are narrow.In addition, corner conducting wire 303 Quantity is not inventive point of the invention, so corner conducting wire 303 is also possible to split conductor.
Technology contents and technical characterstic of the invention have revealed that as above, it being understood, however, that in creative ideas of the invention Under, those skilled in the art can make various changes and improve to above structure and material, including individually disclose or want here Ask the combination of the technical characteristic of protection, it will be apparent that other combinations including these features.These deformations and/or combination each fall within this In technical field involved in inventing, and fall into the protection scope of the claims in the present invention.

Claims (7)

1. a kind of cross-arm is used for anchor support, the anchor support includes tower body, and one end of the cross-arm is connected on the tower body, The one end of the cross-arm far from the tower body is free end, is used for connecting wire, it is characterised in that: end is arranged in the free end Connector and bridle wire apparatus, the bridle wire apparatus are horizontally set on the end coupling and stretch to far from the tower body direction Out, the bridle wire apparatus is composite post insulator, and described composite post insulator one end connects the end coupling, another For mounting wire jumper, the anchor support is angle tower at end, and the two sides of the end coupling are respectively fixedly connected with that there are two extend Part, in the projection of horizontal plane, the extension device stretches out and vertical with the composite post insulator from the end coupling Setting, the conducting wire are connected on the end of the extension device, and the angle of the middle line of the extension device and the cross-arm is greater than institute State the angle of the middle line of conducting wire and the cross-arm.
2. cross-arm as described in claim 1, it is characterised in that: the composite post insulator passes through described in connection gold utensil mounting Wire jumper.
3. cross-arm as described in claim 1, it is characterised in that: two extension devices form the extension device of an entirety, institute Two conducting wires for stating tower body two sides are connected to the both ends of the whole extension device.
4. cross-arm as described in claim 1, it is characterised in that: be provided at least one reinforcer on the extension device.
5. cross-arm as claimed in claim 4, it is characterised in that: at least one described reinforcer connects the extension device and described End coupling.
6. cross-arm as described in claim 1, it is characterised in that: the cross-arm is compound cross-arm.
7. a kind of anchor support, the anchor support includes the tower body, it is characterised in that: the anchor support includes such as claim 1 To cross-arm described in any one of 6 claims.
CN201610594229.1A 2016-07-26 2016-07-26 Cross arm and strain tower Active CN106049959B (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
CN201610594229.1A CN106049959B (en) 2016-07-26 2016-07-26 Cross arm and strain tower
JP2019504130A JP7012069B2 (en) 2016-07-26 2017-07-21 Crossarms and angle towers and tension towers including them
CA3032316A CA3032316C (en) 2016-07-26 2017-07-21 Cross arm and angle tower and tension tower comprising the same
PCT/CN2017/093791 WO2018019180A1 (en) 2016-07-26 2017-07-21 Cross arm and angle tower and tension support comprising the same
BR112019001514-0A BR112019001514B1 (en) 2016-07-26 2017-07-21 CROSS ARM APPLIED TO AN ANGULAR TOWER, ANGULAR TOWER, CROSS ARM APPLIED TO A TENSION TOWER AND TENSION TOWER
KR1020197005544A KR102163507B1 (en) 2016-07-26 2017-07-21 Cross arm, and angle tower and tension tower including the same
AU2017304793A AU2017304793B2 (en) 2016-07-26 2017-07-21 Cross arm and angle tower and tension support comprising the same
ES17833483T ES2958599T3 (en) 2016-07-26 2017-07-21 Cross arm for an angle pylon
US16/320,346 US11283254B2 (en) 2016-07-26 2017-07-21 Cross arm and angle tower and tension tower comprising the same
RU2019104467A RU2728638C1 (en) 2016-07-26 2017-07-21 Crossarm, as well as angular support containing thereof
EP17833483.5A EP3492674B1 (en) 2016-07-26 2017-07-21 Cross arm for angle towers
SA519400964A SA519400964B1 (en) 2016-07-26 2019-01-24 Cross Arm and Angle Tower and Tension Tower Comprising The Same
ZA2019/01149A ZA201901149B (en) 2016-07-26 2019-02-22 Cross arm and angle tower and tension support comprising the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610594229.1A CN106049959B (en) 2016-07-26 2016-07-26 Cross arm and strain tower

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CN106049959A CN106049959A (en) 2016-10-26
CN106049959B true CN106049959B (en) 2019-03-05

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116856784A (en) * 2021-11-08 2023-10-10 上海神马电力工程有限公司 Tension tower

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100913253B1 (en) * 2009-01-30 2009-08-24 주식회사 서우 Power transmission rail track installation method that use catenary fixing device that fix electric wire so that miniaturization of straight tower may be available and catenary fixing device of polymer arm insulators
CN201674193U (en) * 2010-05-07 2010-12-15 中国电力工程顾问集团中南电力设计院 Single loop edge phase jumper wire overwind strain tower
CN202788142U (en) * 2012-09-28 2013-03-13 国家电网公司 Cross arm of power transmission tower
CN105155908A (en) * 2015-08-31 2015-12-16 国核电力规划设计研究院 Heavy icing area alternating current strain tower in shape like Chinese character 'gan'
CN204920402U (en) * 2015-09-15 2015-12-30 中国能源建设集团江苏省电力设计院有限公司 Transmission line single loop chamfer tower
CN205908090U (en) * 2016-07-26 2017-01-25 江苏神马电力股份有限公司 Cross arm and strain insulator tower

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100913253B1 (en) * 2009-01-30 2009-08-24 주식회사 서우 Power transmission rail track installation method that use catenary fixing device that fix electric wire so that miniaturization of straight tower may be available and catenary fixing device of polymer arm insulators
CN201674193U (en) * 2010-05-07 2010-12-15 中国电力工程顾问集团中南电力设计院 Single loop edge phase jumper wire overwind strain tower
CN202788142U (en) * 2012-09-28 2013-03-13 国家电网公司 Cross arm of power transmission tower
CN105155908A (en) * 2015-08-31 2015-12-16 国核电力规划设计研究院 Heavy icing area alternating current strain tower in shape like Chinese character 'gan'
CN204920402U (en) * 2015-09-15 2015-12-30 中国能源建设集团江苏省电力设计院有限公司 Transmission line single loop chamfer tower
CN205908090U (en) * 2016-07-26 2017-01-25 江苏神马电力股份有限公司 Cross arm and strain insulator tower

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