CN215834330U - Sectional type windage yaw jumper wire composite insulator - Google Patents
Sectional type windage yaw jumper wire composite insulator Download PDFInfo
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- CN215834330U CN215834330U CN202121975952.7U CN202121975952U CN215834330U CN 215834330 U CN215834330 U CN 215834330U CN 202121975952 U CN202121975952 U CN 202121975952U CN 215834330 U CN215834330 U CN 215834330U
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Abstract
The utility model relates to a wind deflection prevention insulator, in particular to a sectional wind deflection prevention jumper wire composite insulator which is structurally characterized in that a core rod comprises a thick core rod, a thin core rod with the diameter smaller than that of the thick core rod and a step-structured switching fitting, an umbrella skirt sheath comprises a large-diameter umbrella skirt sheath matched with the thick core rod and a small-diameter umbrella skirt sheath matched with the thin core rod, the switching fitting comprises a large-diameter cylindrical interface and a small-diameter cylindrical interface which are integrally structured, one end of the thick core rod is pressed in the large-diameter cylindrical interface, and the other end of the thick core rod is fixedly connected with a tower cross arm through an end fitting; one end of the thin core rod is pressed in the small-diameter cylindrical interface, and the other end of the thin core rod is connected with the lead through a high-voltage fitting; the diameter ratio of the thick core rod to the thin core rod is 1.5: 1-3: 1, and the length ratio of the insulator upper section monomer to the insulator lower section monomer is 1: 2-3: 1. has the advantages that: the high-rigidity insulator has good rigidity, ensures that the insulator has certain toughness, reduces the windward area and the weight of the insulator, and reduces the influence of wind pressure on the deformation of the insulator.
Description
Technical Field
The utility model relates to a windage yaw prevention insulator, in particular to a sectional type windage yaw prevention jumper wire composite insulator.
Background
China is one of a few countries in the world which are most seriously affected by typhoon, typhoon landing is possible on long coastlines from north to south and coastal areas, the wind speed of the typhoon attacking the coastal areas can reach over 40-60m/s, and the wind gust effect is obvious, so most coastal towers need to adopt wind-proof deflection measures to reduce the swing of jumper strings, and the requirement of the jumper strings after wind deflection on the electrical distance of the tower is met.
In the power transmission line with the grade below 500kV, the windage yaw prevention composite insulator is widely applied, and the trip accidents of the power transmission line caused by windage yaw are greatly reduced. At present, the jumper string of the 500kV power transmission line corner tower mainly adopts a conventional equal-diameter disc-shaped insulator to form a string and increase the weight of a hammer, and a windage yaw tripping accident easily occurs under the action of typhoon, so that the application of the windage yaw prevention composite insulator on the 500kV line corner tower is an effective measure for avoiding windage yaw faults, however, as the wind speed of a coastal typhoon area is high, the length of the 500kV line jumper string and the drainage line is large, the wind load is large, and the jumper is a four-split form, and the vertical fixed type windage prevention insulator adopting the integral equal-diameter structure core rod is adopted, the equal-diameter core rod insulator needs to bear large bending moment, so that the integral rigidity, the weight and the expansion surface are large, and the following problems are caused:
because the windage yaw prevention insulator is used for connecting a wire, one end of the windage yaw prevention insulator is a suspension end, but the windage area is large due to the large spreading surface, so that the windage yaw prevention insulator is also large under the wind impact, and the other end of the rigid connection is directly influenced under the integral rigid action. The other end of the windage yaw prevention insulator is directly fixed on the cross arm and is in rigid connection, after the insulator which is rigid as a whole and heavy is subjected to torsional elastic deformation due to multiple wind impacts, the connecting bolt and the cross arm angle steel at the fixed connection part are easy to damage or destabilize under the action of large bending moment, and therefore insulator string falling accidents are caused, and further the line operation problem is caused.
Disclosure of Invention
The utility model aims to provide a sectional type wind deflection jumper wire-proof composite insulator which can effectively reduce wind impact and reduce the load on a pole tower according to the defects of the prior art.
The purpose of the utility model is realized by the following ways:
a sectional type wind deflection preventing jumper wire composite insulator comprises a core rod and an umbrella skirt sheath which is fixed on the outer peripheral surface of the core rod in a surrounding manner, and is structurally characterized in that the core rod comprises a thick core rod, a thin core rod with the diameter smaller than that of the thick core rod and a step-structured switching hardware fitting, the umbrella skirt sheath comprises a large-diameter umbrella skirt sheath matched with the thick core rod and a small-diameter umbrella skirt sheath matched with the thin core rod, the thick core rod and a large-diameter umbrella skirt sheath externally connected with the thick core rod form an insulator upper section single body, and the thin core rod and a small-diameter umbrella skirt sheath externally connected with the thin core rod form an insulator lower section single body; the adapter fitting comprises a large-diameter cylindrical interface and a small-diameter cylindrical interface which are integrally constructed, one end of the thick core rod is pressed in the large-diameter cylindrical interface, and the other end of the thick core rod is fixedly connected with the tower cross arm through an end fitting; one end of the thin core rod is pressed in the small-diameter cylindrical interface, and the other end of the thin core rod is connected with the lead through a high-voltage fitting; the diameter ratio of the thick core rod to the thin core rod is 1.5: 1-3: 1.
For the windage yaw prevention insulator, one side of a wire is a section which is mainly impacted by wind power, and one side of a cross arm is stressed and is mainly influenced by the windage yaw of one side of the wire; in addition, the diameter of the partial insulator is reduced, so that the quality of the whole insulator is greatly reduced, and the load of the insulator on a tower is effectively reduced.
The utility model may further be embodied as:
the length ratio of the insulator upper section monomer to the insulator lower section monomer is 1: 2-3: 1.
the length of the two sections of insulators is correspondingly set according to the voltage grade of the tower, the wind force condition, the conducting wire and other conditions, in order to ensure the rigidity and achieve the effects of load reduction and wind prevention, one section of the thick core rod is larger than one third of the full length of the insulator, and one section of the thin core rod is larger than one fourth of the full length of the insulator.
The umbrella skirt sheath is of an alternate open structure with large and small umbrella discs, and the thickness of the large-diameter umbrella skirt sheath is larger than that of the small-diameter umbrella skirt sheath.
The shed sheath is used as an external insulation part of the composite insulator, and mainly provides the insulator with moisture flash and pollution flash prevention performance and protects the core rod from the attack of the external atmosphere. The umbrella skirt sheath with the large and small umbrella disc alternating open type structure has good self-cleaning performance and enough wet flashing performance, and is suitable for coastal areas with dirt accumulation caused by wind.
In the switching hardware fitting, the opening ends of the large-diameter cylindrical interface and the small-diameter cylindrical interface are provided with L-shaped notches, and the notches face the hollow inner cavity; the large-diameter umbrella skirt sheath and the small-diameter umbrella skirt sheath are respectively connected into the L-shaped notches of the corresponding barrel-shaped interfaces in the adapter fitting and are sealed and fixed through sealant.
Therefore, the tightness of the shed sheath and the core rod interface in the adapter fitting can be ensured, and the thick and thin core rods are effectively protected from being corroded by the external environment.
The end hardware fitting is a circular flange, one end of the end hardware fitting is connected with the thick core rod through compression joint, and the other end of the end hardware fitting is connected with the iron tower cross arm through bolts.
The circular flange can have a larger contact surface with the cross arm of the iron tower as the end fitting, so that the stability of connection with the cross arm of the iron tower is ensured.
The low-voltage end grading ring is installed on one side of the end fitting, and the high-voltage end grading ring is installed on one side of the high-voltage fitting.
The grading rings fixed at the two ends of the insulator can effectively improve the electric field distribution, the electric field distribution is uniform, the high-voltage electric field is prevented from accelerating the aging of the end part of the composite insulator, and an arc striking effect is realized when the overvoltage occurs, so that the surface of the shed is prevented from being burnt by the electric arc.
In summary, the 500kV windage yaw prevention composite insulator applied to the diameter-variable structure of the typhoon area is provided, the insulator with the diameter-variable structure is composed of an upper section of insulator monomer and a lower section of insulator monomer with different diameters, the diameter of the upper section of insulator monomer connected with the cross arm is larger, good rigidity is provided to effectively resist the offset caused by strong wind, the diameter of the lower section of monomer connected with the lead is smaller, on one hand, the quality and the windward area of the insulator are reduced, on the other hand, better toughness is provided, and a certain end offset can be provided to absorb wind energy, so that the wind impact is effectively reduced, the stress influence on one side of the cross arm is reduced, and the load of the insulator on a tower is effectively reduced.
Drawings
FIG. 1 is a schematic structural view of a sectional type windage yaw jumper wire composite insulator according to the present invention;
FIG. 2 is a schematic structural diagram of the connection between the sectional type wind deflection prevention jumper wire composite insulator and a tower;
fig. 3 is an enlarged schematic structural view of a portion a in fig. 1, i.e., a structural view of the adapter of the present invention.
The present invention will be further described with reference to the following examples.
Detailed Description
The best embodiment is as follows:
referring to the attached drawings 1-3, the sectional type windage yaw jumper wire composite insulator with the diameter-variable structure comprises a core rod and an umbrella skirt sheath which is fixed on the outer peripheral surface of the core rod in a surrounding manner, wherein the core rod comprises a thick core rod 21, a thin core rod 22 with the diameter smaller than that of the thick core rod and a step-structured switching hardware 12, the umbrella skirt sheath comprises a large-diameter umbrella skirt sheath 31 matched with the thick core rod 21 and a small-diameter umbrella skirt sheath 32 matched with the thin core rod 22, the thick core rod 21 and the large-diameter umbrella skirt sheath 31 externally connected with the thick core rod form an upper section single body of the insulator, and the thin core rod 22 and the small-diameter umbrella skirt sheath 32 externally connected with the thin core rod form a lower section single body of the insulator. The adapter fitting 12 comprises a hollow large-diameter cylindrical interface and a hollow small-diameter cylindrical interface which are integrally constructed, one end of the thick core rod 21 is pressed in the large-diameter cylindrical interface, and the other end of the thick core rod is fixedly connected with the tower cross arm 60 through the end fitting 11; one end of the thin core rod 22 is pressed in the small-diameter cylindrical interface, and the other end is connected with the lead through the high-voltage fitting 13. The diameter ratio of the thick core rod 21 to the thin core rod 22 is 1.5: 1-3: 1; the length ratio of the insulator upper section monomer to the insulator lower section monomer is 1: 2-3: 1.
examples of applications of the present invention include the following:
the core rod is an epoxy resin glass fiber rod, adopts a solid structure, has tensile strength higher than 1100MPa, has good bending and fatigue resistance, and bears the mechanical load of the composite insulator. The diameter of the single thick core rod at the upper section of the insulator is 90mm, the length of the single thick core rod is 3m, and the diameter of the single thin core rod at the lower section of the insulator is 45mm, and the length of the single thin core rod is 1.9 m.
The umbrella skirt sheath is made of high-temperature vulcanized silicone rubber serving as a raw material of the umbrella skirt and the sheath by an injection molding process, and the high temperature and the high pressure in the injection process can effectively improve the adhesion between the silicone rubber and the core rod, ensure the tightness of the interface between the umbrella skirt sheath and the core rod, and effectively protect the core rod from being corroded by the external environment. The umbrella skirt sheath adopts a large and small umbrella disc alternating open umbrella-shaped design, has good self-cleaning performance and enough wet flashing performance, and is suitable for coastal areas with dirt accumulation caused by wind. As the thickness of the 500kV insulator sheath is not less than 4.5mm, the thickness of the phi 90 core rod sheath is 6mm, and the thickness of the phi 45 core rod sheath is 5 mm. In addition, the umbrella-shaped parameter of the phi 90mm core rod is as follows: the diameters of the large umbrella disk and the small umbrella disk are respectively 238mm and 198mm, the umbrella extension of the large umbrella disk and the small umbrella disk is respectively 68mm and 48mm, the umbrella spacing is 36mm, the upper surface inclination angle is 7.5 degrees, the ratio of the umbrella spacing to the umbrella extension is 0.99, the ratio of the creepage distance to the spacing is 3.91, the edge thickness of the umbrella skirt is 3.8mm, and the root thickness of the umbrella skirt is 8 mm; umbrella-shaped parameter of a phi 45mm core rod: the diameters of the large umbrella and the small umbrella are 158mm and 128mm respectively, the umbrella extension of the large umbrella disk and the small umbrella disk is 51.5mm and 35mm respectively, the umbrella spacing is 28mm, the upper surface inclination angle is 7.5 degrees, the ratio of the umbrella spacing to the umbrella extension is 1.08, the ratio of the creepage distance to the umbrella spacing is 3.66, the edge thickness of the umbrella skirt is 4.8mm, and the root thickness of the umbrella skirt is 7.8 mm.
The end hardware fitting 11 is a circular flange, is formed by forging and hot galvanizing No. 45 steel, is connected with a thick core rod by a crimping process at one end, and is rigidly connected to an iron tower cross arm by bolts at the other end. The outer diameter of the circular flange is phi 260mm, 4 bolt holes with the diameter of phi 26mm are distributed, M24 bolts are adopted, and the strength grade is 10.9. The composite insulator steel foot is connected with the angle tower drainage wire through the duplex socket hanging plate and the four-split spacing rod.
The voltage-sharing devices are fixed at two ends of the insulator to improve electric field distribution, the voltage-sharing rings are made of aluminum alloy materials, the low-voltage end voltage-sharing rings 41 and the high-voltage end voltage-sharing rings 42 are respectively arranged at the low-voltage end and the high-voltage end, the diameters of the voltage-sharing rings are 370mm phi, the pipe diameters are 50mm phi, and the shielding depths are 60 mm.
As shown in fig. 3, in the adapter fitting 12, the open ends of the large-diameter cylindrical interface and the small-diameter cylindrical interface are both provided with L-shaped notches 13, and the notches face the hollow inner cavity; the large-diameter umbrella skirt sheath and the small-diameter umbrella skirt sheath are respectively connected into the L-shaped notches of the corresponding barrel-shaped interfaces in the adapter fitting and are sealed and fixed through the sealant 50, so that the sealing performance of the umbrella skirt sheath and the core rod interface is guaranteed, and the core rod is effectively protected from being corroded by the external environment.
The key points of the utility model are as follows:
1) by adopting the design of the reducing structure of the core rod, the windage yaw prevention composite insulator has good rigidity and ensures that the insulator has certain toughness, and the damage of the wire hanging angle steel of the iron tower caused by the overlarge bending distance of the composite insulator acting on the joint of the iron tower is avoided. Meanwhile, the windward area and the weight of the insulator can be reduced, and the influence of wind pressure on the deformation of the insulator is reduced. The composite insulator can effectively limit the swing range of the insulator string under the action of strong wind, ensures that the electric clearance of the charged body to the tower body meets the requirement, and is favorable for shortening the length of the jumper wire cross arm and reducing the weight of the iron tower to a certain extent. Through a bending load test in a laboratory, under the condition of a rated bending load of 4kN, the actual offset of the end part of the core rod (the end of the thin core rod) is less than 1600mm and is far less than the windage yaw displacement of the conventional jumper wire.
2) The open umbrella-shaped design of the alternating type is adopted, the self-cleaning performance is good, the wet flashing performance is sufficient, and the open umbrella-shaped design is suitable for coastal areas with dirt accumulation caused by wind. The circular flange end has a larger contact surface with the cross arm of the iron tower, and is stably connected with the cross arm of the iron tower. The grading ring is made of an aluminum alloy material, the electric field distribution is uniform, the high-voltage electric field is prevented from accelerating the aging of the end part of the composite insulator, and an arc striking function is realized when the overvoltage occurs, so that the surface of the umbrella skirt is prevented from being burnt by the electric arc.
The parts of the utility model not described are the same as the prior art.
Claims (4)
1. A sectional type wind deflection preventing jumper wire composite insulator comprises a core rod and an umbrella skirt sheath which is fixed on the outer peripheral surface of the core rod in a surrounding mode, and is characterized in that the core rod comprises a thick core rod, a thin core rod with the diameter smaller than that of the thick core rod and a step-structured switching hardware fitting, the umbrella skirt sheath comprises a large-diameter umbrella skirt sheath matched with the thick core rod and a small-diameter umbrella skirt sheath matched with the thin core rod, the thick core rod and the large-diameter umbrella skirt sheath externally connected with the thick core rod form an insulator upper section single body, and the thin core rod and the small-diameter umbrella skirt sheath externally connected with the thin core rod form an insulator lower section single body; the switching hardware fitting comprises a large-diameter cylindrical interface and a small-diameter cylindrical interface which are integrally constructed, one end of the thick core rod is pressed in the large-diameter cylindrical interface, and the other end of the thick core rod is fixedly connected with the tower cross arm through an end hardware fitting; one end of the thin core rod is pressed in the small-diameter cylindrical interface, and the other end of the thin core rod is connected with the lead through a high-voltage fitting; the diameter ratio of the thick core rod to the thin core rod is 1.5: 1-3: 1; the length ratio of the insulator upper section monomer to the insulator lower section monomer is 1: 2-3: 1; the end hardware fitting is a circular flange, one end of the end hardware fitting is connected with the thick core rod through compression joint, and the other end of the end hardware fitting is connected with the iron tower cross arm through bolts.
2. The sectional type wind-deflection-preventing jumper wire composite insulator as claimed in claim 1, wherein the shed sheath is of an open structure with large and small shed discs alternating with each other, and the thickness of the large-diameter shed sheath is larger than that of the small-diameter shed sheath.
3. The sectional type windage yaw jumper wire composite insulator is characterized in that in the switching hardware fitting, the opening ends of the large-diameter cylindrical interface and the small-diameter cylindrical interface are provided with L-shaped notches, and the notches face the hollow inner cavity; the large-diameter umbrella skirt sheath and the small-diameter umbrella skirt sheath are respectively connected into the L-shaped notches of the corresponding barrel-shaped interfaces in the adapter fitting and are sealed and fixed through sealant.
4. The sectional type wind-deflection-preventing jumper wire composite insulator is characterized by further comprising a low-voltage-end grading ring and a high-voltage-end grading ring, wherein the low-voltage-end grading ring is installed on one side of the end fitting, and the high-voltage-end grading ring is installed on one side of the high-voltage fitting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121975952.7U CN215834330U (en) | 2021-08-23 | 2021-08-23 | Sectional type windage yaw jumper wire composite insulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121975952.7U CN215834330U (en) | 2021-08-23 | 2021-08-23 | Sectional type windage yaw jumper wire composite insulator |
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| Publication Number | Publication Date |
|---|---|
| CN215834330U true CN215834330U (en) | 2022-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121975952.7U Active CN215834330U (en) | 2021-08-23 | 2021-08-23 | Sectional type windage yaw jumper wire composite insulator |
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| CN (1) | CN215834330U (en) |
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2021
- 2021-08-23 CN CN202121975952.7U patent/CN215834330U/en active Active
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