CN111946129A - 220kV high wind speed area single-loop composite material cross arm cat head type tangent tower - Google Patents
220kV high wind speed area single-loop composite material cross arm cat head type tangent tower Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 38
- 241000282326 Felis catus Species 0.000 title claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
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- 239000000463 material Substances 0.000 claims abstract description 13
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- 238000004364 calculation method Methods 0.000 claims description 2
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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- E—FIXED CONSTRUCTIONS
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- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/24—Cross arms
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/05—Suspension arrangements or devices for electric cables or lines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/20—Spatial arrangements or dispositions of lines or cables on poles, posts or towers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/22—Arrangements of earthing wires suspended between mastheads
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Abstract
The invention discloses a 220kV high-wind-speed-region single-loop composite material cross arm cat-head type tangent tower, and relates to a tangent tower. At present, the cross arm needs to hang a side phase wire, needs to have enough strength, and has the problems of more material requirements, large floor area, high cost, difficult assembly and the like. The cross arm is provided with a special-shaped component fixedly connected with angle steel, the outer contour of the cross section of the special-shaped component is formed by connecting two right-angle sides and an arc side, wherein the two right-angle sides are matched with the right-angle inner side surface of the angle steel; the special-shaped component is of a multilayer structure and comprises an outer coating, a reinforcing layer and a filling layer, wherein the outer coating, the reinforcing layer and the filling layer are sequentially arranged from outside to inside. By adopting the special-shaped component, a large amount of steel can be saved, the insulating property of the special-shaped component is utilized, the windage yaw and pollution flashover accidents of the line are easily solved, the safe operation level of the line is improved, the size of a tower head can be reduced, the width of a corridor is reduced, the land resource is saved, the removal cost is reduced, and the engineering investment cost is reduced.
Description
Technical Field
The invention relates to a tangent tower, in particular to a 220kV high-wind-speed area single-loop composite material cross arm cat-head type tangent tower.
Background
With the high-speed development of urban construction, along with the day-to-day and month-to-month development of overhead transmission lines, land becomes an increasingly scarce resource, and the problem of damage of line corridors and transmission lines is selected as a first difficult problem for the construction of the transmission lines. The great improvement of people's consciousness to environment and self-protection for transmission line becomes very difficult in the aspects such as policy processing, removal and arrangement, saving corridor. The transmission line conductor is a special material and is mainly under the action of wind load in a natural working environment, and the wind pressure borne by the conductor accounts for 50% -70% of the wind pressure borne by the line conductor in the operation process, so that the tower supporting the conductor must bear the wind load transmitted by the conductor on the basis of bearing the wind load per se. The wind load has large damage frequency to the power transmission line, large degree range and serious economic loss. Researches show that the selection of the shape of the lead and the design of iron tower materials play an important role in the field of power transmission, and line workers always strive for a simple method to minimize the wind pressure for a long time. The power grid meets the requirements of the existing power grid and the power development requirements of China. For this reason, the design of the 220kV transmission tower can adopt a compact and compact design scheme.
At present, the cross arm needs to hang the side phase wire, so enough strength is needed to ensure the wind resistance of the power transmission tower, and in order to meet the strength requirement, the corridor width is required to be large, so the problems of more material requirements, large occupied area, high cost, difficult assembly and the like exist.
Disclosure of Invention
The invention aims to solve the technical problem and provide the technical task of perfecting and improving the prior technical scheme and providing the 220kV high-wind-speed area single-loop composite cross arm cat-head type tangent tower so as to achieve the purpose of reducing the size of the tower head. Therefore, the invention adopts the following technical scheme.
The single-loop composite material cross arm cat-head type tangent tower in the 220kV high wind speed area comprises tower legs, a tower body, a cat-head type tower head and a ground wire support, wherein the tower head comprises a cross beam positioned at the upper part, an upper bent arm and a lower bent arm positioned below two sides of the cross beam, the lower end of the lower bent arm is connected with the tower body, a cross arm is arranged on the lower bent arm, a special-shaped component fixedly connected with angle steel is arranged on the cross arm, the outer contour of the cross section of the special-shaped component is formed by connecting two right-angle sides and an arc side, and the two right-angle sides are matched with the right-angle inner side face of the angle steel; the special-shaped component is of a multilayer structure and comprises an outer coating, a reinforcing layer and a filling layer, wherein the outer coating, the reinforcing layer and the filling layer are sequentially arranged from outside to inside. The special-shaped component can be fixed on the angle steel through bolts, screws and the like; compare traditional tip and adopt the connected mode of flange, weight significantly reduces, and the installation is basically unanimous with conventional tower, has avoided connecting the changeover portion, and construction convenience is swift. Because the insulating properties of the composite material are better, the length of the insulator string and the air space between the conductor and the tower body can be reduced under the condition of ensuring the same insulation level, and on the premise of meeting the electrical safety clearance, the space between the three-phase conductors is reduced, a corridor is compressed, and the lightning resistance is improved. This technical scheme adopts compound cross arm to compress the corridor width. And the wind resistance of the power transmission tower is ensured. The composite material has the advantages of light weight, high strength, corrosion resistance, convenient processing and forming, good electrical insulation and the like. After the composite material is adopted, a large amount of steel can be saved, the insulating property of the composite material is utilized, the windage yaw and pollution flashover accidents of the line are easily solved, the safe operation level of the line is improved, the size of a tower head can be reduced, the width of a corridor can be reduced, the land resource can be saved, the removal cost can be reduced, and the engineering investment cost can be reduced. In addition, due to the characteristics of light weight and easiness in processing and forming, the transportation and assembly cost of the tower can be greatly reduced. The device makes full use of the advantages of the composite material, the strength of the cross arm is effectively increased by the special-shaped component, the defects of weak wind resistance and large self weight of the traditional power transmission tower are overcome, and the device is suitable for designing the power transmission tower in a high wind speed area. The problems of too much and too wide corridor occupied by the power transmission line are effectively solved.
As a preferable technical means: the cross beam, the upper crank arm and the lower crank arm enclose a tower window, an insulator string used for connecting a middle phase lead is arranged in the tower window, and the insulator string is hoisted on the cross beam.
As a preferable technical means: the two cross arms are in a pull-down dovetail shape, and the lower end parts of the cross arms are provided with insulator strings used for connecting two side phase wires; the insulator strings connected with the middle phase lead and the insulator strings connected with the two side phase leads are arranged in a triangular shape. The dovetail shape of the pull-down further controls the tower head size. The two side phase wires are connected with the composite material wire cross arm by adopting I-shaped insulator strings, and the length of the strings is reduced to further shorten the length of the cross arm, so that the width of a line corridor is compressed. Compared with the conventional cat-head type tangent tower, the maximum inter-line distance is compressed by 5.0m, the layer height is compressed by 1.5m, and the whole tower head is compressed and optimized.
As a preferable technical means: the hanging point of the ground wire bracket is positioned at the outer side of the side phase lead. The hanging point of the ground wire top frame 1 is positioned outside the single-loop side phase conductor so as to achieve the purpose of negative protection on the side phase conductor.
As a preferable technical means: the beam is provided with a special-shaped component fixedly connected with the angle steel. The crossbeam also adopts special-shaped component, helps further reducing cat head size, reduce cost.
As a preferable technical means: the outer coating is a fiber protective coating, the reinforcing layer is a glass fiber layer, and the filling layer is a foam filling layer. The reduction of the clearance circle enables the vertical distance between the tower heads to be reduced, thereby improving the lightning resistance.
As a preferable technical means: the thickness of the reinforcing layer is smaller than that of the filling layer. The filling layer is large in size, so that the strength is improved, the weight is reduced, the strength is sufficient, and the two ends of the angle steel are lower than the outermost point of the special-shaped component.
As a preferable technical means: the special-shaped component is connected to the angle steels through bolts, adjacent angle steels are connected through flanges, one end of each flange is connected with one angle steel through a bolt, and the other end of each flange is connected with the other angle steel through a bolt; the special-shaped component is over against or obliquely against the insulator string hung on the special-shaped component.
As a preferable technical means: the middle phase lead and the side phase lead are both low wind pressure leads; the low wind pressure lead comprises a wire core, an inner layer conductor and an outer layer conductor; all inner layer conductors are covered by outer layer conductors, and one side of each outer layer conductor, which is in contact with the external environment, is of a conductor structure with an outward convex radian, so that the outer surfaces of fluctuant low wind pressure conductors are formed, and grooves are formed between adjacent outer layer conductors on the outer surfaces of the low wind pressure conductors. Compared with a common conventional power transmission conductor, the cross section of the low-wind-pressure conductor is provided with a circular arc with a certain angle, so that the material consumption and the weight can be reduced, and the construction difficulty and the construction cost are reduced. Through the change of the groove radian outside the wire, the roughness of the surface of the wire is increased to a certain extent, so that the wind resistance coefficient of the surface of the wire becomes smaller. The differential pressure resistance of the whole transmission line lead is reduced, the whole resistance coefficient of the low wind pressure line is correspondingly reduced, and the total resistance of the line is further reduced. Therefore, the wind resistance of the wire under the condition of high wind speed can be effectively improved, and the wind resistance coefficient is reduced. The combination of the composite material and the low wind pressure lead on the power transmission tower can improve the wind resistance of the power transmission tower. This device adopts a low wind pressure wire on transmission tower combined material's basis, when receiving the effect of incoming flow wind, when speed changes, combined material on the transmission tower and the roughness on the low wind pressure wire surface that the transmission tower adopted can influence the influence that reduces the wind load jointly to a certain extent to improve holistic anti-wind pressure ability.
As a preferable technical means: the diameter of the low wind pressure conducting wire is related to the groove, and the diameter of the low wind pressure conducting wire is increased along with the reduction of the radian of the groove; when the radian of the groove is 10-15 degrees, the diameter range corresponding to the low wind pressure lead is 30-40 mm; when the radian of the groove is 15-20 degrees, the diameter range corresponding to the low wind pressure lead is 20-30 mm; when the radian of the groove is 20-25 degrees, the diameter of the low wind pressure lead is not more than 20 mm.
As a preferable technical means: the radius r from the outermost point of the outer surface of the low wire to the center of the low wind pressure wire is related to the wind speed, the diameter of the wire and the calculation of a central angle theta; the radius r decreases with increasing wind speed and increases with increasing central angle theta.
The formula for the radius r is:
in the formula: in the formula:
designing a wind speed value for the line, wherein the unit of the wind speed value is m/s; theta is a central angle formed by outer arcs of two adjacent outer-layer leads, and the unit is DEG; radius r, in mm.
Has the advantages that:
1) light weight, high strength-to-weight ratio and saving of a large amount of steel.
2) The insulating properties is good, effectively reduces insulating design level, reduces the looks wire interval, reduces the corridor width, can show in addition and reduce accident such as thunder and lightning flashover, ice flashover, galloping.
3) Chemical corrosion resistance, wear resistance, water resistance, fire resistance and flame retardance.
4) Easy processing and molding, and convenient installation, transportation and assembly.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
FIG. 2 is a schematic cross-sectional view of a heteroelement of the present invention.
Fig. 3(a) is a schematic view of the wind load of the conventional wire.
Fig. 3(b) is a schematic diagram of a low wind pressure conductor wind load reduction mechanism.
Fig. 4 is a schematic cross-sectional structure of a low-voltage wind conducting wire.
Fig. 5 is a schematic view of the horizontal swing angle of the wire.
Fig. 6 is a diagram of the tension force of a wire.
Fig. 7 is a schematic diagram of the bending moment of the wire.
FIG. 8 is a connection diagram of the anisotropic member of the present invention.
Fig. 9 is a connecting view of angle iron of the present invention.
The reference numerals shown in the figures are: 1. a ground wire bracket; 2. an upper crank arm; 3. a lower crank arm; 4. a cross beam; 5. a cross arm; 6. a tower head; 7. an insulator string; 8. a tower window; 9. a tower body; 10. tower legs; 11. a profiled member; 12. coating the surface; 13. a filling layer; 14. angle steel; 15. a reinforcing layer; 16. a low wind pressure wire; 17. a wire core; 18. an inner layer conductor; 19. an outer conductor; 20. a groove; 21. a flange; 22. and (4) bolts.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings in the specification.
As shown in fig. 1-2, a 220kV high wind speed area single-loop composite material cross arm 5 cat-head type linear tower comprises tower legs 10, a tower body 9, a cat-head type tower head 6 and a ground wire bracket 1, wherein the cat head comprises a cross beam 4 positioned at the upper part, an upper curved arm 2 and a lower curved arm 3 positioned below two sides of the cross beam 4, the lower end of the lower curved arm 3 is connected with the tower body 9, the lower curved arm 3 is provided with a cross arm 5, the cross arm 5 is provided with a special-shaped component 11 fixedly connected with angle steel 14, the outer contour of the cross section of the special-shaped component 11 is formed by connecting two right-angle sides and arc sides, wherein the two right-angle sides are matched with the right-angle; the special-shaped component 11 is of a multilayer structure and comprises an outer coating 12, a reinforcing layer 15 and a filling layer 13, wherein the outer coating 12, the reinforcing layer 15 and the filling layer 13 are sequentially arranged from outside to inside. The profiled element 11 can be fixed to the angle iron 14 by means of bolts, screws or the like; compared with the traditional composite material member with the flange at the end part, the weight is greatly reduced, the installation is basically consistent with that of the conventional tower, the connection transition section is avoided, and the construction is convenient and fast. Because the insulating property of the composite material is better, the length of the insulator string 7 and the air space between the conducting wire and the tower body can be reduced under the condition of ensuring the same insulation level, and on the premise of meeting the electrical safety clearance, the space between the three-phase conducting wires is reduced, a corridor is compressed, and the lightning resistance is improved. This technical scheme adopts compound cross arm 5 to compress the corridor width. And the wind resistance of the power transmission tower is ensured. The composite material has the advantages of light weight, high strength, corrosion resistance, convenient processing and forming, good electrical insulation and the like. After the composite material is adopted, a large amount of steel can be saved, the insulating property of the composite material is utilized, the windage yaw and pollution flashover accidents of the line are easily solved, the safe operation level of the line is improved, meanwhile, the size of the tower head 6 can be reduced, the width of a corridor is reduced, the land resource is saved, the removal cost is reduced, and the engineering investment cost is reduced. In addition, due to the characteristics of light weight and easiness in processing and forming, the transportation and assembly cost of the tower can be greatly reduced. The device makes full use of the advantages of the composite material, overcomes the defects of weak wind resistance and large self weight of the traditional power transmission tower, and is suitable for the design of the power transmission tower in a high wind speed area. The problems of too much and too wide corridor occupied by the power transmission line are effectively solved.
In the embodiment, a beam 4, an upper crank arm 2 and a lower crank arm 3 enclose a tower window 8, an I-shaped insulator string 7 for connecting a middle phase conductor is arranged in the tower window 8, and the insulator string 7 is hung on the beam 4. The two cross arms 5 are in a pull-down dovetail shape, and the lower end parts of the cross arms 5 are provided with insulator strings 7 used for connecting two side phase wires; the insulator strings 7 connected with the middle phase lead and the insulator strings 7 connected with the two side phase leads are arranged in a triangular shape. The dovetail shape of the pull-down further controls the size of the tower head 6. The two side phase wires are connected with the composite material wire cross arm 5 by adopting an I-shaped insulator string 7, and the length of the cross arm 5 is further shortened by reducing the length of the string, so that the width of a line corridor is compressed. Compared with the conventional cat-head type linear tower, the maximum inter-line distance is compressed by 5.0m, the layer height is compressed by 1.5m, and the whole tower head 6 is compressed and optimized.
For the purpose of improving protection, the hanging point of the ground wire bracket 1 is positioned at the outer side of the side phase lead. The hanging point of the ground wire top frame 1 is positioned outside the single-loop side phase conductor so as to achieve the purpose of negative protection on the side phase conductor.
In order to further reduce the size of the cat head, the beam 4 is provided with a special-shaped component 11 fixedly connected with an angle steel 14. The beam 4 also adopts a profiled member 11, which helps to further reduce the size of the cat-head. The cost is reduced.
For under the circumstances of guaranteeing intensity, guarantee that matter is light, convenient assembly: the outer coating 12 is a fiber protective coating, the reinforcing layer 15 is a glass fiber layer, and the filling layer 13 is a foam filling layer. The reduction of the clearance circle enables the vertical spacing of the tower heads 6 to be reduced, thereby improving lightning resistance. In order to further improve the safety, the length of the inner right-angle side of the angle steel 14 matched with the special-shaped component 11 is basically the same as the length of the two right-angle sides of the special-shaped component 11; the arc surface of the special-shaped component 11 is higher than the matched angle steel 14. The reinforcing layer 15 has a smaller thickness than the filler layer 13. The size of the filling layer 13 is large, which contributes to strength improvement, and the filling layer has sufficient strength while reducing the weight, and both ends of the angle steel 14 are lower than the outermost point of the special-shaped member 11. The composite material has good insulating property, and can reduce the length of an insulator string 7 and the air space between the lead and the tower body under the condition of ensuring the same insulating level, thereby reducing the space between three-phase leads and compressing a corridor; on the premise of meeting the electrical safety clearance, the height of the tower head 6 can be effectively reduced, so that the lightning resistance is improved. The two side phase wires are connected with the composite material wire cross arm 5 by adopting an I-shaped insulator string 7, and the length of the cross arm 5 is further shortened by reducing the length of the string, so that the width of a line corridor is compressed. Compared with the conventional cat-head type linear tower, the maximum inter-line distance is compressed by 5.0m, the layer height is compressed by 1.5m, and the whole tower head 6 is compressed and optimized. The reduction of the clearance circle enables the vertical spacing of the tower heads 6 to be reduced, thereby improving lightning resistance.
As shown in fig. 8 and 9, in order to facilitate the connection between adjacent angle steels and the special-shaped member, the special-shaped member 11 is connected to the angle steels 14 through bolts, the adjacent angle steels 14 are connected through a flange 21, one end of the flange 21 is connected to one angle steel through a bolt 22, and the other end of the flange 21 is connected to the other angle steel through a bolt 22; the special-shaped component 11 is over against or obliquely against the insulator string 7 hung on the special-shaped component. The connection is reliable, and the connection of the adjacent angle steels 14 is also convenient. In order to reduce the influence on the special-shaped member 11 and ensure the strength at the same time, the bolts 22 can be arranged in an array mode to fix the special-shaped member 11 on the angle iron 14, the special-shaped member 11 is arranged in an included angle of the angle iron, and the bolt arrays are arranged on two folding edges of the angle iron 14, so that the special-shaped member 11 is reliably fixed on the angle iron 14.
As shown in fig. 3(a), the wire is a general wire, and the peeling point of air from the wire is early, and the wind resistance is large. In order to reduce wind resistance, the middle phase conductor and the side phase conductor are both low wind pressure conductors 16; as shown in fig. 3(b), the low wind pressure conducting wire 16 with the undulating outer surface effectively reduces wind resistance; as shown in fig. 4, the low wind pressure conducting wire 16 includes a wire core 17, an inner conductor 18, and an outer conductor 19; all the inner conductors 18 are covered by the outer conductors 19, and one side of each outer conductor, which is in contact with the external environment, is of a conductor structure with an outward convex radian, so that the outer surfaces of the low wind pressure conductors 16 are wavy, and grooves 20 are formed between the adjacent outer conductors on the outer surfaces of the low wind pressure conductors 16. Compared with a common conventional power transmission lead, the cross section of the low wind pressure lead 16 is provided with a circular arc with a certain angle, so that the material consumption can be reduced, the weight is reduced, and the construction difficulty and the construction cost are reduced. The roughness of the surface of the wire is increased to a certain extent through the change of the radian of the groove 20 on the outer side of the wire, so that the wind resistance coefficient of the surface of the wire becomes smaller. The differential pressure resistance of the whole transmission line lead is reduced, the whole resistance coefficient of the low wind pressure line is correspondingly reduced, and the total resistance of the line is further reduced. Therefore, the wind resistance of the wire under the condition of high wind speed can be effectively improved, and the wind resistance coefficient is reduced. The combination of the composite material and a low wind pressure conductor 16 on the transmission tower further improves the wind resistance of the transmission tower. This device adopts a low wind pressure wire 16 on transmission tower combined material's basis, when receiving the effect of incoming flow wind, when speed changes, the roughness on combined material on the transmission tower and the low wind pressure wire 16 surface that the transmission tower adopted can influence the influence that reduces the wind load to a certain extent jointly to improve holistic anti-wind pressure ability. Compared with a common conventional power transmission lead, the cross section of the low wind pressure lead 16 is provided with a circular arc with a certain angle, so that the material consumption can be reduced, the weight is reduced, and the construction difficulty and the construction cost are reduced. The low wind pressure lead 16 can effectively reduce the wind resistance coefficient, thereby reducing the wind load, further improving the service life of the lead and reducing the material manufacturing cost. The centers of the low wind pressure conducting wires 16 are all located on the same reference circle, and the centers of the arc line structures of all the conducting wires contacting with the external environment are all located on the same arc. The low wind pressure lead 16 structure with smaller wind resistance coefficient can be obtained by combining the radiuses of the inner arc, the inner circle and the outer arc in a proper range and improving the construction technology and the manufacturing process. The surface of the wire structure is provided with an arc wire surface with a certain angle, the wire structure is given appropriate roughness, the backflow area is relatively small under the action of incoming wind, the differential pressure resistance of the whole transmission line wire is reduced accordingly, the total resistance of the whole low wind pressure line is reduced, and the resistance coefficient is correspondingly reduced. Therefore, the wind resistance of the wire under the condition of high wind speed can be effectively improved, and the wind resistance coefficient is reduced.
Example (b): a single-loop composite material cross arm 5 cat head type tangent tower in a 220kV high wind speed area comprises a ground wire support 1, tower legs 10, a tower body 9, a tower head 6 and a lead insulator string 7, wherein the tower head 6 is composed of a tower window 8 and a composite material lead cross arm 5 with two side phases.
After the single-loop composite material cross arm 5 cat-head type tangent tower wire cross arm 5 in the high wind speed area is made of the composite material, the length of an insulator string 7 is shortened, a clearance circle is correspondingly reduced, the width of a corridor is reduced, and the conveying capacity of a unit corridor is improved according to the semi-insulation consideration of the wire cross arm 5.
According to the difference of low wind pressure diameter, the radian size between two small arcs is also different, and along with the increase of wire diameter, the radian size also reduces correspondingly. When the diameter of the wire is less than or equal to 20mm, the required radian is 20-25 degrees, when the diameter range of the wire is 20-30 degrees, the required radian is 15-20 degrees, and when the diameter range of the wire is 30-40 degrees, the required radian is 10-15 degrees.
TABLE 1 relationship between radian of groove on outer surface of low wind pressure conductor and diameter of conductor
| Diameter of wire | D≥20 | 20＜D≤30 | 30＜D≤40 |
| Arc of |
20°～25° | 15°～20° | 10°～15° |
The invention provides a low-wind-pressure wire which is used as a novel wire to reduce the wind resistance coefficient, in particular to the wind resistance coefficient under high wind speed, aiming at the defects of high wind resistance coefficient, large wind resistance and the like of the existing wire. The wire is designed through the radian of the external groove, the damage of the power transmission line is reduced by reducing the resistance, and the wire has a superior energy-saving effect. The outer conductor generally adopts a fan-shaped section, so that the surface is closer to a smooth circumference to reduce the wind resistance coefficient. The surface roughness of the outer layer and the certain relation existing between the fillet radius of the V-shaped groove, the diameter of the lead and the central angle theta are specifically expressed as follows:
in the formula (I), the compound is shown in the specification,
and designing a wind speed value (m/s) for the circuit, wherein r is the surface roughness of the structure and the radius (mm) of a circular corner of two adjacent V-shaped grooves, and theta is a central angle (DEG) formed by two adjacent outer arcs.
Fig. 5 is a schematic diagram of the horizontal swing angle θ of the wire. The static horizontal oscillation angle can be expressed with the weight of the wire and the wind load acting on the wire as parameters:
Wm＝(ρ·V2·CD·D·L)/2
in the formula WmThe wind load (kg/m) borne by the wire; wcIs the weight per unit length of the wire; ρ is the air density (kg · s)2/m4) (ii) a V is wind speed (m/s); cDIs a coefficient of resistance; d is the outer diameter (m) of the wire;
the low wind pressure strand is used as a part of the low wind pressure lead, and the analysis of the stress condition of the strand is helpful for analyzing the wind load. The force analysis is performed on a certain micro-segment of the wire as shown in fig. 6 and 7. The wire is subjected to a tensile force F along the axial direction, and the axial force is translated to a total bending moment M which is obtained by superposing a bending moment caused by the cross section center of each strand and the spiral strand and a bending moment generated by the spiral strand by friction between the center strand and the spiral strand.
The tensile force of the strand in the tangential direction of the axis of the strand is as follows:
Zd＝Fd/cosβ
the tensile force borne by the wire is as follows:
F＝∑Fd＝∑Zd cosβ
the stress on the central strand cross section is:
σ1＝Zd/A
the stress on the helical strand cross section is:
wherein: fdIs the component force of the folded yarn along the axial direction; beta is the helix angle of the folded yarn; a is the cross-sectional area of the folded yarn;
Izis the moment of inertia; y is the height from the neutral axis.
The middle strand coincides with the axis of the cross section of the lead, and the external force F applied to the lead coincides with the axis of the cross section in parallel. Therefore, the low wind pressure lead only bears axial tension and only bears tensile stress on the cross section, and the helical strands bear the action of non-collinearity and bending moment, so that the tensile stress and the bending stress exist on the cross section.
The single-loop composite material cross arm cat-head type tangent tower in the high wind speed area of 220kV shown in the above figures is a specific embodiment of the present invention, already embodies the substantive features and the progress of the present invention, and can be modified equivalently in the aspects of shape, structure and the like according to the practical use requirements, and is within the protection scope of the present invention.
Claims (10)
1.220kV high wind speed district single loop combined material cross arm cat head type tangent tower, tower head (6) and ground wire support (1) including tower leg (10), body of the tower (9), cat head type, its characterized in that: the tower head (6) comprises a cross beam (4) positioned at the upper part, an upper crank arm (2) and a lower crank arm (3) positioned below two sides of the cross beam (4), the lower end of the lower crank arm (3) is connected with a tower body (9), a cross arm (5) is arranged on the lower crank arm (3), a special-shaped component (11) fixedly connected with an angle steel (14) is arranged on the cross arm (5), the outer contour of the cross section of the special-shaped component (11) is formed by connecting two right-angle sides and an arc side, wherein the two right-angle sides are matched with the right-angle inner side faces of the angle steel (14); the special-shaped component (11) is of a multilayer structure and comprises an outer coating (12), a reinforcing layer (15) and a filling layer (13), wherein the outer coating (12), the reinforcing layer (15) and the filling layer (13) are sequentially arranged from outside to inside.
2. The 220kV high wind speed area single-loop composite cross arm cat-head type tangent tower as claimed in claim 1, wherein: crossbeam (4), upper crank arm (2), lower crank arm (3) enclose into tower window (8), be equipped with insulator chain (7) that are used for connecting well phase conductor in tower window (8), insulator chain (7) hoist and mount on crossbeam (4).
3. The 220kV high wind speed area single-loop composite cross arm cat-head type tangent tower as defined in claim 2, wherein: the two cross arms (5) are in a pull-down dovetail shape, and the lower end parts of the cross arms (5) are provided with insulator strings (7) used for connecting two side-phase wires; insulator strings (7) connected with the middle phase lead and insulator strings (7) connected with the two side phase leads are arranged in a triangular shape.
4. The 220kV high wind speed area single-loop composite cross arm cat-head type tangent tower as defined in claim 3, wherein: the hanging point of the ground wire bracket (1) is positioned at the outer side of the side phase lead.
5. The 220kV high wind speed area single-loop composite cross arm cat-head type tangent tower as defined in any one of claims 1 to 4, wherein: the beam (4) is provided with a special-shaped component (11) fixedly connected with angle steel (14).
6. The 220kV high wind speed area single-loop composite cross arm cat-head type tangent tower as defined in claim 5, wherein: the outer coating (12) is a fiber protective coating, the reinforcing layer (15) is a glass fiber layer, the filling layer (13) is a foam filling layer, and the thickness of the reinforcing layer (15) is smaller than that of the filling layer (13).
7. The 220kV high wind speed area single-loop composite cross arm cat-head type tangent tower as defined in claim 6, wherein: the special-shaped component (11) is connected to the angle steels (14) through bolts, adjacent angle steels (14) are connected through flanges (21), one end of each flange (21) is connected with one angle steel through a bolt, and the other end of each flange (21) is connected with the other angle steel through a bolt; the special-shaped component (11) is over against or obliquely against the insulator string (7) hung on the special-shaped component.
8. The 220kV high wind speed area single-loop composite cross arm cat-head type tangent tower as defined in claim 3, wherein: the middle phase conductor and the side phase conductor are both low wind pressure conductors (16); the low wind pressure lead (16) comprises a wire core (17), an inner layer conductor (18) and an outer layer conductor (19); all the inner layer conductors (18) are covered by the outer layer conductors (19), one side of each outer layer conductor, which is in contact with the external environment, is of a conductor structure with an outward convex radian, so that the outer surfaces of the low wind pressure conductors (16) are wavy, and grooves (20) are formed between the adjacent outer layer conductors on the outer surfaces of the low wind pressure conductors (16).
9. The 220kV high wind speed area single-loop composite cross arm cat-head type tangent tower as recited in claim 8, wherein: the diameter of the low wind pressure conducting wire (16) is related to the groove (20), and the diameter of the low wind pressure conducting wire (16) is increased along with the reduction of the radian of the groove (20); when the radian of the groove (20) is 10-15 degrees, the diameter range corresponding to the low wind pressure lead (16) is 30-40 mm; when the radian of the groove (20) is 15-20 degrees, the diameter range corresponding to the low wind pressure lead (16) is 20-30 mm; when the radian of the groove (20) is 20-25 degrees, the diameter of the low wind pressure conducting wire (16) is not more than 20 mm.
10. The 220kV high wind speed area single-loop composite cross arm cat-head type tangent tower as claimed in claim 9, wherein: the radius r from the outermost point of the outer surface of the low wire to the circle center of the low wind pressure wire (16) is related to the wind speed, the diameter of the wire and the calculation of a central angle theta; the radius r decreases with increasing wind speed and increases with increasing central angle θ;
the formula for the radius r is:
in the formula: in the formula:
designing a wind speed value for the line, wherein the unit of the wind speed value is m/s; theta isThe central angle formed by the outer arcs of the two adjacent outer-layer leads is an angle in degrees; radius r, in mm.
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| CN202010687653.7A CN111946129A (en) | 2020-07-16 | 2020-07-16 | 220kV high wind speed area single-loop composite material cross arm cat head type tangent tower |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115126325A (en) * | 2022-05-27 | 2022-09-30 | 国网甘肃省电力公司电力科学研究院 | Cat-head tower of overhead transmission line and middle-phase transformation method of cat-head tower |
-
2020
- 2020-07-16 CN CN202010687653.7A patent/CN111946129A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115126325A (en) * | 2022-05-27 | 2022-09-30 | 国网甘肃省电力公司电力科学研究院 | Cat-head tower of overhead transmission line and middle-phase transformation method of cat-head tower |
| CN115126325B (en) * | 2022-05-27 | 2024-06-21 | 国网甘肃省电力公司电力科学研究院 | Cat head tower of overhead transmission line and medium phase transformation method of cat head tower |
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