CN202093904U - Grading ring for AC (alternating current) UHV (ultra-high voltage) dual-loop power transmission line in the same tower - Google Patents
Grading ring for AC (alternating current) UHV (ultra-high voltage) dual-loop power transmission line in the same tower Download PDFInfo
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- CN202093904U CN202093904U CN 201020690218 CN201020690218U CN202093904U CN 202093904 U CN202093904 U CN 202093904U CN 201020690218 CN201020690218 CN 201020690218 CN 201020690218 U CN201020690218 U CN 201020690218U CN 202093904 U CN202093904 U CN 202093904U
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- grading ring
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- grading
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 27
- 239000012212 insulator Substances 0.000 claims abstract description 39
- 238000005267 amalgamation Methods 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000012211 strain insulator Substances 0.000 description 20
- 230000000694 effects Effects 0.000 description 11
- 230000005611 electricity Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 241000272165 Charadriidae Species 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a grading ring for an AC (alternating current) UHV (ultra-high voltage) dual-loop power transmission line in the same tower; the grading ring comprises a ring body and a fixing frame; the ring body is arranged in the direction vertical to the current spreading direction of the UHV transmission line and is surrounded by an insulator string; the plane formed by the ring body is vertical to the current spreading direction of the UHV transmission line; the ring body is fixedly arranged on the part of the insulator string by the fixing frame. The ring body can be circular, oval or racetrack-shaped. Through the adoption of the utility model, the corona inception voltage can be greatly improved; the energy consumption is saved, the corona and noise is reduced and the requirement on environmental protection is met.
Description
Technical field
The utility model relates to the transmission facility technical field, specifically, relates to the grading ring of a kind of AC extra high voltage common-tower double-return road used for transmission line.
Background technology
Along with China's rapid growth of economy; the increase of electricity needs; the connecting system in succession of large-scale water power, thermoelectricity, nuclear power station; and the quickening of China's city-building paces, the circuit corridor is more and more nervous, how to improve the transmission capacity of unit corridor; rationally utilize land resource; environmental protection etc. all are the countries in the world questions of common interest, and the East China load density is big, circuit corridor scarcity.Power network development is subjected to serious restriction.According to the concrete condition of East China, build common-tower double-return (double circuit line) transmission line, for alleviating the rare contradiction of East China land resource, improve circuit corridor utilization ratio, improve the East China Power Grid conveying capacity and can both play huge effect.So-called same tower double back transmission line is meant that being equipped with on the same shaft tower differs and is decided to be that same electrical presses the transmission line with two loops of frequency.Developed area, East China, project of transmitting and converting electricity path, 1000kV Huainan-Shanghai (Wan Diandong send), because circuit corridor scarcity, it is infeasible fully to build two single loops, builds common-tower double-return technology UHV transmission line.
According to the Future in China flow of power to the characteristics that distribute with load center and the characteristics of ultra-high voltage AC transmission and extra-high voltage direct-current transmission, in China's extra-high voltage grid is built, to be that dominant shape becomes the key rack of national ultra high voltage with 1000 kilovolts of AC extra high voltage transmissions of electricity, to realize the strong synchronously networking of each big regional power grid.
Along with electric pressure raises, it is more and more longer that the circuit suspension insulator that links to each other with transmission pressure in the transmission line and being used to bears the strain insulator of the tensioning load of power circuit after built on stilts, and its voltage distribution is also inhomogeneous more.Circuit dangles, strain insulator voltage distributes generally is the distribution of " U " deltoid, and it is higher that voltage is born at the insulator two ends, and it is lower that intermediate standoff is born voltage.Partial discharge often produces and development from the local field strength higher position, bearing the highest insulator of voltage easily discharges earlier, and progressively develop into flashover, therefore reduce insulator near lead one side bear voltage and improve strain insulator voltage distribute be improve dangle, a kind of effective measures of strain insulator discharge inception voltage and flashover voltage.
In the transmission line of the present 500kV of China; grading ring generally is set in insulator string and transmission pressure junction improves the voltage and the voltage distribution of bearing on the insulator string; grading ring is all pressed the effect except that having; also can play the striking effect; the discharge flashover of generation is betided between two rings, and the protection full skirt is not burnt.
The end view of the grading ring 10 of prior art as shown in fig. 1, ring body 11 and two fixed mount 12a and 12b constitute grading ring 10, label 15 expression insulator strings.As can be seen from Figure, the arm 12a of fixed mount and the angle a of ring body normal direction are 10 °, and in addition, another arm 12b of fixed mount and the angle of ring body normal direction are 5 °.The radius of curvature R a of an arm 12a of grading ring fixed mount is 180mm, and the radius of curvature R b of another arm 12b of grading ring fixed mount is 160mm.In the fixed rack structure of this grading ring, the turning of fixed mount and ring body junction is near 90 °, and the fixed mount bending radius is little, makes the shielding action of grading ring reduce, thereby causes corona voltage on the low side.
Moreover the ring body of grading ring 10 of the prior art is an ear shape.Normal three to six insulator strings that adopt are two-layer or two-layer above arrangement from top to bottom in UHV transmission line, in this case, when adopting ear type grading ring, this grading ring can have contiguous upper and lower layer insulator string all presses effect preferably, but all pressures effect to middle insulator string is relatively poor, still can have the situation that middle insulator string is burnt out owing to the voltage skewness.Ultra high voltage requires discharge inception voltage to require height in addition, if the design of the fixed mount of grading ring is unreasonable, often can't pass the corona requirement.
Therefore, need a kind of grading ring of reasonable in design, to satisfy the transmission line corona requirement of 1000kV common-tower double-return road.
The utility model content
At the problems referred to above, a purpose of the present utility model provides a kind of simple in structure, and all pressures effect that can in dangling of putting of many rows, strain insulator environment, obtain, particularly can be more effectively to being positioned at the new solution that the intermediate standoff string is all pressed in dangling of putting many rows, the strain insulator.
According to the utility model, the grading ring of a kind of AC extra high voltage common-tower double-return road used for transmission line is provided, described grading ring comprises: place along the direction vertical with the current spread direction of UHV transmission line, around the ring body of insulator string, vertical with the current spread direction of UHV transmission line by the plane that described ring body constitutes; With the fixed mount that described ring body is fixedly installed on the parts that are connected described insulator string.Wherein, described ring body is one of following shape: circle, oval, perhaps by two sections circular arcs consistent in shape and size relatively place, end points on the correspondence position of end points of a circular arc and another circular arc is by a line segment links to each other, another end points and another end points of described another circular arc of a described circular arc also link to each other and constitute by a line segment curve (that is, described ring body has the shape of similar runway).
In the utility model, grading ring has adopted circulus, makes that the structure of grading ring is more succinct than existing ear formula grading ring.
Preferably, described insulator string is strain insulator string or suspension insulator.
Preferably, dangle or strain insulator string when being provided with for single string when described, described ring body can be the circle around insulator.The grading ring of annular when single insulator string is all pressed can reduce the cost of manufacture of grading ring because structure is simple relatively.
Preferably, dangle or strain insulator string when being provided with for many rows put when described, described ring body can be to dangle around described many strings simultaneously or the ellipse or the runway shape ring body of strain insulator.By making the technical scheme of grading ring around the ultra high voltage insulator, make insulator string in the middle of in dangling of putting of many rows or strain insulator string, being positioned near have grading ring that it is all pressed, improved effectively that multi-joint row when the ultra high voltage environment is dangled, be positioned at all pressures effect of intermediate standoff in the strain insulator, in the strain insulator string environment that many rows put, obtained and better all press effect so compare original ear formula grading ring.
Preferably, described ring body designs for split, and the circle shape or the runway shape shape of promptly described annular ring body or runway shape ring body are made up of two parts or more parts amalgamation.
Preferably, described ring body is provided with breach.Under the situation of this split-type structural, made things convenient for the installation and maintenance of grading ring.
Preferably, the angle of two arms of described grading ring fixed mount and ring body normal direction is respectively 20 ° and 15 °.
Preferably, two brachiocylloosis radiuses of described grading ring fixed mount are respectively 220mm and 240mm.
Preferably, be under the situation of suspension insulator at described insulator string, described grading ring is big grading ring.And, in described big grading ring, comprising little grading ring, little grading ring comprises ring body and fixed mount, and two arms of wherein said fixed mount are J-shaped respectively and are connected with the bottom of fixed mount with anti-J-shaped, and the turning of described J-shaped and anti-J-shaped is near the right angle.
By using the utility model, can improve discharge inception voltage greatly, save energy consumption, reduce corona and noise, satisfy environmental requirement.
With reference to the detailed description of accompanying drawing to exemplary embodiment of the present utility model, it is clear that further feature of the present utility model and advantage thereof will become by following.
Description of drawings
The accompanying drawing that constitutes the part of specification has been described embodiment of the present utility model, and is used to explain principle of the present utility model together with the description.
With reference to accompanying drawing, according to following detailed, can be expressly understood the utility model more, wherein:
Fig. 1 illustrates the end view of the grading ring of prior art.
Fig. 2 illustrates the end view according to grading ring of the present utility model.
Fig. 3 illustrates the assembly drawing according to grading ring of the present utility model.
Fig. 4 illustrates the assembly drawing that is equipped with according to the strain insulator string of grading ring of the present utility model.
Fig. 5 illustrates the assembly drawing according to the little grading ring of string that dangles of the present utility model.
Fig. 5 a illustrates the end view of the little grading ring of string that dangles of prior art.
Fig. 6 illustrates the end view according to the little grading ring of string that dangles of the present utility model.
Embodiment
Describe various exemplary embodiment of the present utility model in detail now with reference to accompanying drawing.
Below be illustrative to the description only actually of at least one exemplary embodiment, never as any restriction to the utility model and application or use.In shown here and all examples of discussing, it is exemplary that any occurrence should be construed as merely, rather than as restriction.Therefore, other example of exemplary embodiment can have different values.
Fig. 2 illustrates the end view according to grading ring 20 of the present utility model, and Fig. 3 illustrates the assembly drawing according to grading ring 20 of the present utility model.
As shown in the figure, ring body 21 and fixed mount 22 constitute grading ring 20, label 15 expression insulator strings.Described ring body 20 is preferably split design, the circle shape of promptly described annular ring body or runway shape ring body or run-track shapedly form by two parts or more parts amalgamation, and described ring body is provided with breach c.Under the situation of this split-type structural, made things convenient for the installation and maintenance of grading ring.
Grading ring 20 for split-type design, each amalgamation of ring body 21 partly has fixed mount 22, be used for described ring body be fixedly installed on connect described edge substring parts (for example, connecting the installing hole that leaves grading ring on the gold utensil, between insulator and yoke plate, grading ring is installed), so that the insulator pressurized is even, and prevent near the gold utensil corona that insulator is.
As shown in the figure, the arm 22a of fixed mount and the angle a of ring body normal direction are about 20 ° from 10 ° of increases of prior art, and another arm 22b of fixed mount and the angle of ring body normal direction are about 15 ° from 5 ° of increases of prior art.The radius of curvature R a of fixed mount 22a is about 240mm from the 180mm increase of prior art, and the radius of curvature R b of grading ring fixed mount 22b is about 220mm from the 160mm increase of prior art.It will be appreciated by those skilled in the art that angle given here and radius are exemplary, other can improve all pressures effect of grading ring and the angle and the radius of raising discharge inception voltage also is feasible.
As can be seen from Figure, grading ring of the present utility model be shaped as annular, and be not the shape of the similar ear of prior art.
When dangle, when strain insulator is provided with for single string, described ring body 21 can be the circle around insulator.And when dangle, when strain insulator is provided with for many rows put, described ring body 21 can be simultaneously around described many strings dangle, the oval ring body of strain insulator, or be similar to the shape of runway, thereby there is grading ring that it is all pressed near the insulator string in the middle of being positioned in dangling of making that many rows put, the strain insulator string, improved effectively that multi-joint row when the ultra high voltage environment is dangled, be positioned at all pressures effect of intermediate standoff in the strain insulator.
Fig. 4 illustrates the assembly drawing that is equipped with according to the strain insulator string of grading ring 20 of the present utility model.
Fig. 5 illustrates the assembly drawing according to the string grading ring that dangles of the present utility model.The described string that dangles adopts the lantern ring type design, for example can comprise big grading ring 20, little grading ring 30 and middle grading ring 40.Although show large, medium and small three grading rings here, it will be appreciated by those skilled in the art that the grading ring that can use other quantity as required.Improvement and front for big grading ring 20 are roughly the same with reference to the described improvement of Fig. 2-4, no longer describe in detail here.Improvement to little grading ring 30 is below described.
Fig. 5 a illustrates the little grading ring 50 of string that dangles of prior art.Described little grading ring 50 comprises ring body 51 and fixed mount 52.As shown in the figure, two arms of fixed mount 52 have rectilinear form, and tilt to respect to the bottom degree of m in obtuse angle, protrude in fixed mount 52 (ledge is represented by label e) thereby be used for installing such as position component such as bolts.Little grading ring is used for synthetic insulator, and little grading ring horizontal plane is parallel with the synthetic insulator insulator, and little grading ring plays the synthetic insulator end and all presses, and big grading ring mainly plays bunch of insulator and all presses.Use the little grading ring of this structure of Fig. 5 a to be easy to cause insulator voltage inhomogeneous, thereby cause corona.
Fig. 6 illustrates the front view according to the little grading ring 60 of string that dangles of the present utility model.Described little grading ring 60 comprises ring body 61 and fixed mount 62.Two arms of fixed mount 62 roughly are J-shaped and anti-J-shaped, the turning of J-shaped and anti-J-shaped is near rectangular, and be connected with the bottom of the fixed mount of little grading ring, be used for installing to cover such as position component such as bolts, component no longer such as bolt is protruded in outside the fixed mount.Simultaneously, the part that the top of two arms of fixed mount 62 links to each other with ring body also is made into wideer than the bottom, is used on the ring body 61 installing such as position component such as bolts to cover.This improved structure can be improved and all presses effect, avoids corona.
Though specific embodiments more of the present utility model are had been described in detail by example, it should be appreciated by those skilled in the art that above example only is in order to describe, rather than in order to limit scope of the present utility model.It should be appreciated by those skilled in the art, can under the situation that does not break away from scope and spirit of the present utility model, above embodiment be made amendment.Scope of the present utility model is limited by claims.
Claims (6)
1. the grading ring of an AC extra high voltage common-tower double-return road used for transmission line, described grading ring comprises:
Along the direction vertical with the current spread direction of UHV transmission line place, around the ring body of insulator string, vertical by the plane that described ring body constitutes with the current spread direction of UHV transmission line; With
Described ring body is fixedly installed on the fixed mount on the parts that connect described insulator string;
Wherein said ring body is one of following shape: circle, ellipse, perhaps by two sections circular arcs consistent in shape and size relatively place, end points on the correspondence position of end points of a circular arc and another circular arc is by a line segment links to each other, another end points and another end points of described another circular arc of a described circular arc also link to each other and constitute by a line segment curve.
2. according to the described grading ring of claim 1, wherein said ring body designs for split, and described ring body is made up of two parts or more parts amalgamation.
3. according to the described grading ring of claim 1, wherein said ring body is provided with breach.
4. according to the described grading ring of claim 1, two arms of wherein said grading ring fixed mount and the angle of ring body normal direction are respectively 20 ° and 15 °.
5. according to the described grading ring of claim 1, the bending radius of two arms of wherein said grading ring fixed mount is respectively 220mm and 240mm.
6. according to the described grading ring of claim 1, be under the situation of suspension insulator wherein at insulator string, described grading ring is big grading ring, and in described big grading ring, comprise little grading ring, described little grading ring comprises ring body and fixed mount, two arms of the fixed mount of wherein said little grading ring are J-shaped respectively and are connected with the bottom of anti-J-shaped with the fixed mount of little grading ring, and the turning of described J-shaped and anti-J-shaped is near the right angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020690218 CN202093904U (en) | 2010-12-30 | 2010-12-30 | Grading ring for AC (alternating current) UHV (ultra-high voltage) dual-loop power transmission line in the same tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020690218 CN202093904U (en) | 2010-12-30 | 2010-12-30 | Grading ring for AC (alternating current) UHV (ultra-high voltage) dual-loop power transmission line in the same tower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202093904U true CN202093904U (en) | 2011-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020690218 Expired - Lifetime CN202093904U (en) | 2010-12-30 | 2010-12-30 | Grading ring for AC (alternating current) UHV (ultra-high voltage) dual-loop power transmission line in the same tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202093904U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762045A (en) * | 2013-11-22 | 2014-04-30 | 国家电网公司 | Suspension insulator string for extra-high-voltage alternating current circuit |
| CN111630741A (en) * | 2017-12-04 | 2020-09-04 | Axpo电力公司 | Transmission line conductor bridging device and application in method for modifying or manufacturing overhead line tower |
-
2010
- 2010-12-30 CN CN 201020690218 patent/CN202093904U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762045A (en) * | 2013-11-22 | 2014-04-30 | 国家电网公司 | Suspension insulator string for extra-high-voltage alternating current circuit |
| CN103762045B (en) * | 2013-11-22 | 2017-02-01 | 国家电网公司 | Suspension insulator string for extra-high-voltage alternating current circuit |
| CN111630741A (en) * | 2017-12-04 | 2020-09-04 | Axpo电力公司 | Transmission line conductor bridging device and application in method for modifying or manufacturing overhead line tower |
| CN111630741B (en) * | 2017-12-04 | 2022-07-15 | Axpo系统网络公司 | Transmission line conductor bridging device and application in method for modifying or manufacturing overhead line tower |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: CHINA POWER ENGINEERING CONSULTING (GROUP) CORPORATION Patentee after: Co., Ltd of Huabei Power Design Inst., China Power Engineering Consulting Group Patentee after: Co., Ltd of Northeastern Electric Power Design Institute, China Power Engineering Consulting Group Corporation Patentee after: Co., Ltd of Central Southern China Electric Power Design Institute, China Power Engineering Consulting Group Corporation Patentee after: NORTHWEST ELECTRIC POWER DESIGN INSTITUTE CO., LTD. OF CHINA POWER ENGINEERING CONSULTING GROUP Patentee after: China Power Engineering Consulting Group Southwest Electric Power Design Institute Co., Ltd. Patentee after: NORTH CHINA POWER ENGINEERING CO., LTD. OF CHINA POWER ENGINEERING CONSULTING GROUP Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee before: State Grid Corporation of China Patentee before: China Power Engineering Consulting Group Corporation Patentee before: Huabei Power Design Inst., China Power Engineering Consulting Group Patentee before: Northeastern Electric Power Design Institute, China Power Engineering Consulting Group Corporation Patentee before: Central Southern China Electric Power Design Institute, China Power Engineering Consulting Group Cor Patentee before: Northwest Electric Power Design Institute, China Power Engineering Consulting Group Corporation Patentee before: Southwest Electric Power Design Institute of China Power Engineering Consulting Group Corporation Patentee before: North China Electric Power Design Institute of China Power Engineering Consulting Group Corporation |
|
| CX01 | Expiry of patent term |
Granted publication date: 20111228 |
|
| CX01 | Expiry of patent term |