CN113674930B - 500kV windage yaw prevention composite insulator applied to variable-diameter structure in typhoon area - Google Patents
500kV windage yaw prevention composite insulator applied to variable-diameter structure in typhoon area Download PDFInfo
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- CN113674930B CN113674930B CN202110964925.8A CN202110964925A CN113674930B CN 113674930 B CN113674930 B CN 113674930B CN 202110964925 A CN202110964925 A CN 202110964925A CN 113674930 B CN113674930 B CN 113674930B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/02—Suspension insulators; Strain insulators
- H01B17/04—Chains; Multiple chains
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/38—Fittings, e.g. caps; Fastenings therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
- H01B17/48—Means for obtaining improved distribution of voltage; Protection against arc discharges over chains or other serially-arranged insulators
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Abstract
The invention relates to a wind deflection preventing insulator, in particular to a 500kV wind deflection preventing composite insulator applied to a diameter-changing structure of a typhoon area, 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 in compression joint with 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 to 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 invention relates to a windage yaw prevention insulator, in particular to a 500kV windage yaw prevention composite insulator applied to a diameter-variable structure in a typhoon area.
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 more than 40-60m/s, and the wind gust effect is obvious, so that most coastal towers need to adopt wind deviation prevention measures to reduce the swing of jumper strings, and the electrical distance of the jumper strings after wind deviation to the tower is ensured to meet the requirements.
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 transmission line corner tower is mainly formed by combining a conventional equal-diameter disc-shaped insulator into a string and adding a weight piece, and a windage yaw tripping accident easily occurs under the typhoon effect, so that the application of the windage yaw prevention composite insulator on the 500kV line corner tower is an effective measure for avoiding the windage yaw fault, however, because 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 high, and the jumper is in a four-split form, and the vertical fixed type windage prevention insulator adopting the integral equal-diameter structure core rod needs to bear large bending moment, so that the integral constant-diameter core rod insulator is required to have strong integral rigidity, heavy weight and large expansion surface, and the following problems are caused:
because windage yaw prevention insulator one end is the end that dangles for connecting the wire, nevertheless because its exhibition face is big, leads to the area of meeting the wind big to it is also big to make it receive the wind impact, and directly influence the other end of rigid connection under whole rigidity effect. The other end of the wind deviation prevention insulator is directly fixed on the cross arm and is in rigid connection, after the insulator which is rigid and heavy in overall and is distorted and elastically deformed by multiple wind impacts, the connecting bolt and the cross arm angle steel at the fixed connection position are easy to damage or destabilize under the action of large bending moment, and therefore insulator string falling accidents are caused, and the problem of line faults is caused.
Disclosure of Invention
The invention aims to provide a 500kV windage yaw prevention composite insulator which can effectively reduce wind impact and reduce load of a tower mast and is applied to a typhoon area reducing structure according to the defects of the prior art.
The purpose of the invention is realized by the following ways:
a500 kV windage yaw prevention composite insulator applied to a typhoon area diameter-changing 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, 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, wherein 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 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 to 1, a partition plate is arranged between the large-diameter cylindrical interface and the small-diameter cylindrical interface of the adapter fitting, and the large-diameter umbrella skirt sheath and the small-diameter umbrella skirt sheath are respectively and correspondingly connected to the opening end edges of the large-diameter cylindrical interface and the small-diameter cylindrical interface.
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 invention can be further embodied as follows:
the length ratio of the insulator upper section monomer to the insulator lower section monomer is 1:2 to 3:1.
according to the voltage grade of a tower, the wind force condition, the conducting wire and other conditions, the lengths of the two sections of insulators are correspondingly set, in order to ensure rigidity and achieve load reduction and wind prevention effects, one section of the thick core rod is larger than one third of the total length of the insulator, and one section of the thin core rod is larger than one fourth of the total length of the insulator.
The umbrella group 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 outer insulation part of the composite insulator, mainly provides moisture flashover and pollution flashover resistance for the insulator, and protects the core rod from the invasion 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 insulator quality and the windward exhibition area 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 the tower is effectively reduced.
Drawings
FIG. 1 is a schematic structural diagram of a 500kV windage yaw prevention composite insulator with a reducing structure, provided by the invention;
FIG. 2 is a schematic structural diagram of the connection between a 500kV windage yaw prevention composite insulator with a diameter-variable structure 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, a 500kV windage yaw prevention composite insulator applied to a typhoon area diameter change structure comprises a core rod and a shed jacket surrounding and fixed on the outer peripheral surface of the core rod, 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 shed jacket comprises a large-diameter shed jacket 31 adapted to the thick core rod 21 and a small-diameter shed jacket 32 adapted to the thin core rod 22, the thick core rod 21 and the large-diameter shed jacket 31 externally connected with the thick core rod form an insulator upper section single body, and the thin core rod 22 and the small-diameter shed jacket 32 externally connected with the thin core rod form an insulator lower section single body. 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 to 1; the length ratio of the insulator upper section monomer to the insulator lower section monomer is 1:2 to 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 1.9m.
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 5mm. 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 8mm; 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 7.8mm.
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 60mm.
As shown in fig. 3, in the adapter fitting 12, a partition plate is arranged between the large-diameter cylindrical interface and the small-diameter cylindrical interface, and L-shaped notches 13 are arranged at the opening ends of the large-diameter cylindrical interface and the small-diameter cylindrical interface, and 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 invention 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 electrified body meets the requirement on the electrical clearance of the tower body, 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 invention not described are the same as the prior art.
Claims (6)
1. A500 kV windage yaw prevention composite insulator applied to a typhoon area reducing structure comprises a core rod and an umbrella skirt sheath which is surrounded and fixed on the outer peripheral surface of the core rod, 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 which is adapted to the thick core rod and a small-diameter umbrella skirt sheath which is adapted to the thin core rod, wherein the thick core rod and the large-diameter umbrella skirt sheath which is externally connected with the thick core rod form an upper section monomer of the insulator, and the thin core rod and the small-diameter umbrella skirt sheath which is externally connected with the thin core rod form a lower section monomer of the insulator; 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 coarse core rod to the fine core rod is 1.5 to 1;
a partition plate is arranged between the large-diameter cylindrical interface and the small-diameter cylindrical interface of the adapter fitting, and the large-diameter umbrella skirt sheath and the small-diameter umbrella skirt sheath are respectively and correspondingly connected to the open end edges of the large-diameter cylindrical interface and the small-diameter cylindrical interface.
2. The 500kV windage yaw prevention composite insulator applied to the variable diameter structure in the typhoon area according to claim 1, wherein the length ratio of the insulator upper section monomer to the insulator lower section monomer is 1:2 to 3:1.
3. the 500kV windage yaw prevention composite insulator applied to the variable diameter structure in the typhoon area as claimed in claim 1, wherein the shed sheath is of an open structure with alternating large and small shed discs, and the thickness of the large-diameter shed sheath is larger than that of the small-diameter shed sheath.
4. The 500kV windage yaw prevention composite insulator applied to the variable diameter structure in the typhoon area as claimed in claim 1, wherein in the switching fitting, L-shaped notches are arranged at the open ends of the large-diameter cylindrical interface and the small-diameter cylindrical interface, 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.
5. The 500kV windage yaw prevention composite insulator applied to the variable diameter structure in the typhoon area as claimed in claim 1, wherein the end fitting is a circular flange, one end of the circular flange is connected with the thick core rod through crimping, and the other end of the circular flange is connected with the iron tower cross arm through bolts.
6. The 500kV windage yaw prevention composite insulator applied to the typhoon area diameter-changing structure 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 an end fitting, and the high-voltage end grading ring is installed on one side of a high-voltage fitting.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110964925.8A CN113674930B (en) | 2021-08-23 | 2021-08-23 | 500kV windage yaw prevention composite insulator applied to variable-diameter structure in typhoon area |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110964925.8A CN113674930B (en) | 2021-08-23 | 2021-08-23 | 500kV windage yaw prevention composite insulator applied to variable-diameter structure in typhoon area |
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| CN113674930A CN113674930A (en) | 2021-11-19 |
| CN113674930B true CN113674930B (en) | 2023-02-03 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1529324A (en) * | 2003-10-16 | 2004-09-15 | 武汉市德赛电力设备有限公司 | Unit serial compound insulator |
| CN200972810Y (en) * | 2006-11-24 | 2007-11-07 | 广州市时代橡塑实业有限公司 | Suspension composite insulator |
| CN201796663U (en) * | 2010-09-21 | 2011-04-13 | 湖北省电力公司襄樊供电公司 | Strain-resistant arrester with insulator |
| CN203536908U (en) * | 2013-10-31 | 2014-04-09 | 国家电网公司 | Segmentation combined-type wind deviation-resistant composite insulation inhaul cable |
| CN205050646U (en) * | 2015-10-30 | 2016-02-24 | 大连电瓷集团股份有限公司 | Extra -high voltage suspension type composite insulator pulling force combination formula cluster umbrella device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150255194A1 (en) * | 2013-10-30 | 2015-09-10 | Graduate School At Shenzhen, Tsinghua University | Selection method for strong wind region composite insulator based on intrinsic frequency, and composite insulator |
-
2021
- 2021-08-23 CN CN202110964925.8A patent/CN113674930B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1529324A (en) * | 2003-10-16 | 2004-09-15 | 武汉市德赛电力设备有限公司 | Unit serial compound insulator |
| CN200972810Y (en) * | 2006-11-24 | 2007-11-07 | 广州市时代橡塑实业有限公司 | Suspension composite insulator |
| CN201796663U (en) * | 2010-09-21 | 2011-04-13 | 湖北省电力公司襄樊供电公司 | Strain-resistant arrester with insulator |
| CN203536908U (en) * | 2013-10-31 | 2014-04-09 | 国家电网公司 | Segmentation combined-type wind deviation-resistant composite insulation inhaul cable |
| CN205050646U (en) * | 2015-10-30 | 2016-02-24 | 大连电瓷集团股份有限公司 | Extra -high voltage suspension type composite insulator pulling force combination formula cluster umbrella device |
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