CN103366908A - Insulation tube for casing pipe - Google Patents
Insulation tube for casing pipe Download PDFInfo
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- CN103366908A CN103366908A CN2013101029267A CN201310102926A CN103366908A CN 103366908 A CN103366908 A CN 103366908A CN 2013101029267 A CN2013101029267 A CN 2013101029267A CN 201310102926 A CN201310102926 A CN 201310102926A CN 103366908 A CN103366908 A CN 103366908A
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- umbrella
- insulated tube
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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
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Abstract
The present invention provides an insulation tube for a casing pipe, which can raise voltage resistance characteristics without thickening the insulation tube. The insulation tube for the casing pipe is provided with a stepped umbrella composed of major-diameter umbrellas (1) and minor-diameter umbrellas (2). A bulge portion (4) is formed on the front end of each major-diameter umbrella (1). The wall thickness on a vertical cross-section of the bulge portion (4) is set as T, and the smallest wall thickness of the front end of the umbrella is set as t, wherein t/T=0.6-0.8, and the curvature radius (R) on the vertical cross-section is 5.5-11 mm. In this manner, the electric potential gradient at the front end of the umbrella is reduced, and the voltage resistance characteristics in relative to the generation of corona and pulse surge.
Description
Technical field
The present invention relates to overlap effective insulated tube, relate in particular to and be applicable to the effective insulated tube of cover that the above high voltage of 550kV is used sleeve pipe.
Background technology
Sleeve pipe is to make center conductor connect the parts of the inside center of the effective insulated tube of cover, produces electric field around it by the high-tension current that flows in center conductor.Especially the Electric Field Distribution on insulated tube surface becomes the key factor of left and right sides exterior insulation performance, when the Electric Field Distribution on insulated tube surface is inappropriate, produces the flashover that caused by overvoltage such as lightning impulse, interrupting pulses, produce in the air problem such as corona when applying running voltage.
Therefore, past case by form capacitor core or configured electrodes is controlled electric field around center conductor, improves insulation property by every means shown in patent documentation 1.Yet high voltage more than 550kV is with sleeve pipe, especially the extra-high pressure more than the 1000kV is with in the sleeve pipe, and its effect also reaches the limit of, and haves no alternative but reduce the electric field strength on insulated tube surface by making the chap of cover effective insulated tube self.But overstriking is overlapped effective insulated tube and can be caused the maximization, weight of equipment to increase, the problem that exists manufacturing cost also to raise and so on.
The prior art document
Patent documentation 1: TOHKEMY 2010-192277 communique
Summary of the invention
Therefore, the object of the invention is to solve above-mentioned existing problem points, not overstriking insulated tube self is provided and can improves the effective insulated tube of cover of voltage-resistent characteristic.
The present invention is in order to solve found that above-mentioned problem studies repeatedly, the Electric Field Distribution on the insulated tube surface of left and right sides exterior insulation performance is by making an effort to the front end shape of umbrella and can relaxing, even do not become the insulated tube main part of the maximization that causes equipment or the maximization of umbrella, also can realize the raising of voltage-resistent characteristic.
The present invention finishes in view of above-mentioned opinion, provide a kind of cover effective insulated tube, it possesses the ladder umbrella that is made of large footpath umbrella and path umbrella, it is characterized in that, front end at above-mentioned large footpath umbrella possesses bellying, and the wall thickness on the vertical cross-section of this bellying is being made as T, and when the minimum wall thickness (MINI W.) of umbrella leading section is made as t, t/T=0.6～0.8, and the radius of curvature R on the vertical cross-section is 5.5～11mm.In addition, refer to vertical cross-section by the central axis of insulated tube at this said vertical cross-section.And wall thickness T is defined as: the tangent line of the circular arc on the point that the circular arc in the section line of umbrella section upper surface and front end bellying cross section intersects, and be parallel to above-mentioned tangent line and and the line of the lower side contacts of the circular arc in bellying cross section between distance.
In addition, as described in scheme two, the vertical cross-section shape that can make the front of bellying is the structure that the circular arc of the single radius of curvature of 5.5～11mm consists of by radius of curvature R, or as described in the scheme three, the vertical cross-section shape of making the front of bellying is the structure that the common tangent line of the circular arc up and down of 5.5～11mm and circular arc that should be up and down consists of by radius of curvature R.Which kind of occasion no matter is being made as D at diameter that will large footpath umbrella, and when the diameter of path umbrella is made as d, preferred D/d=1.1～1.8.
The present invention has following beneficial effect.
The effective insulated tube of cover of the present invention forms the bellying of above-mentioned given shape by the front end at the large footpath of electric field strength maximum umbrella, can make insulated tube little along the existing product of the electric field ratio of face.Therefore, not only do not carry out the large footpath of insulated tube main part or umbrella and can suppress to apply corona discharge in the air of running during voltage, but also can improve the superpotential insulation property with respect to lightning impulse, interrupting pulse etc.
Description of drawings
Fig. 1 is the cutaway view of umbrella shape shape of the effective insulated tube of cover of the existing form of expression.
Fig. 2 is the cutaway view of umbrella shape shape of the effective insulated tube of cover of expression the first execution mode of the present invention, wherein, and t/T=0.6～0.8, R=5.5～11.
Fig. 3 is the cutaway view of umbrella shape shape of the effective insulated tube of cover of expression the second execution mode of the present invention, wherein, and t/T=0.6～0.8, R=5.5～11.
Fig. 4 is the pattern of equipotentials that has used the occasion of the effective insulated tube of cover of the present invention.
Among the figure: 1-large footpath umbrella, 2-path umbrella, 3-umbrella dewaters.
Embodiment
Below, represent preferred implementation of the present invention.
Fig. 1 is the cutaway view of the umbrella shape shape on the outer peripheral face of the expression effective insulated tube of cover that is formed on existing form, has represented three kinds of umbrellas 1,2,3 that the umbrella diameter is different.The 1st, large footpath umbrella, the 2nd, the path umbrella that diameter is less than large footpath umbrella 1, these large footpath umbrellas 1 and path umbrella 2 consist of the ladder umbrella with the preset space length combination.Be made as D at diameter that will large footpath umbrella, when the diameter of path umbrella is made as d, preferred D/d=1.1～1.8.In addition, the 3rd, be called as the umbrella of the maximum diameter of the umbrella that dewaters, flow down along the surface of large footpath umbrella 1, path umbrella 2 in order to prevent rinse water, rainwater, general with the arranged spaced about 1m.
When the center conductor at the effective insulated tube of cover of this existing form applies 1200kv, be 6.8 with respect to the dielectric constant of the porcelain that consists of insulated tube, the dielectric constant of air is 1, therefore at the leading section of umbrella, the electric field of air side is high.In the occasion of Fig. 1, the electric potential gradient of the front end of large footpath umbrella 1 is 2.15kV/mm, and the electric potential gradient of the front end of path umbrella 2 is 1.75kV/mm, reaches the 2.15kV/mm that might produce corona in the air.
Therefore, in the present invention, such as Fig. 2, shown in Figure 3, by the front end formation bellying 4 of the large footpath umbrella 1 among the ladder umbrella, reduce the electric potential gradient of the front end of large footpath umbrella 1.In Fig. 4 described later, also form bellying 5 at the front end of the umbrella 3 that dewaters.In the dewater occasion of umbrella of setting, its shape need to be the shape similar to the front end shape of large footpath umbrella 1.Even it is large that radius of curvature becomes, because number is few, therefore can not bring harmful effect to cost.
Fig. 2 is the vertical sectional view of the first execution mode of expression bellying 4, is the situation that the vertical cross-section shape of the front of bellying 4 is made of the circular arc of single radius of curvature.Wall thickness on the vertical cross-section of bellying 4 is being made as T, when the minimum wall thickness (MINI W.) of umbrella leading section is made as t, t/T=0.6～0.8, and the radius of curvature R on the vertical cross-section is 5.5～11mm.In addition, in the occasion of Fig. 2, T is the twice of radius of curvature R.
At this, when the value of t/T surpasses 0.8, cause cost to rise, therefore improper.On the contrary, when the value of t/T less than 0.6 the time, bellying 4 relatively maximizes, the difficulty of the manufacturing process such as increased shaping, drying, burn till causes manufacturing cost to increase, and is therefore improper.
In addition, when the radius of curvature R on the vertical cross-section during less than 5.5mm, similar to existing umbrella, the electric potential gradient alleviation effects descends.On the contrary, when making radius of curvature R surpass 11mm, cause manufacturing cost to increase, therefore improper.
Fig. 3 is the vertical sectional view of the second execution mode of expression bellying 4, is the situation that the vertical cross-section shape of the front of bellying 4 is made of circular arc up and down and its common tangent line.At this, the radius of curvature R of circular arc up and down can be the same or different, but for the foregoing reasons, the radius of curvature R of circular arc up and down is made as 5.5～11mm.In addition, t/T is made as 0.6～0.8.
In addition, in execution mode, T all is 22mm.Therefore, all be the occasion of 5.5mm in the radius of curvature R of up and down circular arc, the length of common tangent line (line part) is 11mm, all is the occasion of 11mm in the radius of curvature R of circular arc up and down, the length of common tangent line (line part) is 0.Like this, the radius of curvature R of common length of tangent degree basis circular arc up and down changes.
Then, utilize concrete data representation foundation of the present invention.
Table 1
Table 1 is illustrated in the electric potential gradient that applies porcelain face occasion, the umbrella front end of 1200kV on the extra-high pressure sleeve pipe with various umbrella shape shapes that the parameter of making changes.But any all is the data that also are provided with the occasion of bellying at the front end of the umbrella 3 that dewaters.Existing product 1,2 t/T are 1.0, are the umbrella shape shapes that does not have bellying therefore, and its electric potential gradient is above 1.8.The electric potential gradient of the present invention's product 1～10 is below 1.75.
The present invention's product 1,2 and the present invention's product 6,7 umbrella front end have single radius of curvature (R) shown in Figure 2.The electric potential gradient of the present invention's product 2 that R is larger than the present invention's product 1 descends.In addition, in the identical occasion of radius of curvature, the present invention's product 6 that the umbrella overhang of large footpath umbrella is large, 7 electric potential gradient further descend.The present invention's product 3,4 and 8,9 umbrella front end are made of up and down circular arc and its common tangent line shown in Figure 3.Compare with the present invention's product 3,4, the umbrella overhang of the present invention's product 8,9 large footpath umbrella is larger, so electric potential gradient descends.The radius of curvature of the upside of the present invention's product 5 is 11mm, and the radius of curvature of downside is 8mm.In addition, in the present embodiment, although the present invention's product 3,4 common tangent line and insulated tube central shaft almost parallel, the gradient of common tangent line is not limited to this, also can be with respect to the insulated tube inclined.
Fig. 4 is the pattern of equipotentials that has applied the occasion of 1200kV at the extra-high pressure sleeve pipe that has adopted the effective insulated tube of cover of the present invention.As shown in the figure, electric field is high at the front end of large footpath umbrella 1, relaxes at the front end than large footpath umbrella 1 path umbrella 2 in the inner part, therefore as long as make an effort in shape at the front end of large footpath umbrella 1, just can access the effect that practical proof voltage improves.
The effective insulated tube of cover of the present invention can be used in any of oil impregnated paper bushing, gas sleeve pipe.Especially the electric pressure more than 550kV, because the electric field gets higher on insulated tube surface, so its effect is large.
In addition, corona in the air in the time of can not only suppressing to apply running voltage can also improve with respect to superpotential insulation characterisitic.Apply the occasion of pulse surge, existing the metal partss such as metalwork from charged side, ground connection side, seal to produce the tendency of time and flashover, and when rainfall, because insulated tube along the impact of the water droplet of face, begins corona discharge with lower voltage sometimes.This phenomenon represents that insulated tube has brought impact along the electric field of face to insulation property, by using the present invention, can realize the raising of insulation characterisitic.
Claims (4)
1. the effective insulated tube of cover possesses the ladder umbrella that is made of large footpath umbrella and path umbrella, it is characterized in that,
Front end at above-mentioned large footpath umbrella possesses bellying, and the wall thickness on the vertical cross-section of this bellying is being made as T, and when the minimum wall thickness (MINI W.) of umbrella leading section is made as t, t/T=0.6～0.8, and the radius of curvature on the vertical cross-section (R) is 5.5～11mm.
2. the effective insulated tube of cover according to claim 1 is characterized in that,
The vertical cross-section shape of the front of above-mentioned bellying is that the circular arc of the single radius of curvature of 5.5～11mm consists of by radius of curvature (R).
3. the effective insulated tube of cover according to claim 1 is characterized in that,
The vertical cross-section shape of the front of above-mentioned bellying is that the circular arc up and down of 5.5～11mm and the common tangent line that is somebody's turn to do circular arc up and down consist of by radius of curvature (R).
4. the effective insulated tube of cover according to claim 1 is characterized in that,
Be made as D at diameter that will large footpath umbrella, and when the diameter of path umbrella is made as d, D/d=1.1～1.8.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012073439 | 2012-03-28 | ||
| JP2012-073439 | 2012-03-28 | ||
| JP2013-059328 | 2013-03-22 | ||
| JP2013059328A JP6002949B2 (en) | 2012-03-28 | 2013-03-22 | Bushing bush |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103366908A true CN103366908A (en) | 2013-10-23 |
| CN103366908B CN103366908B (en) | 2016-12-28 |
Family
ID=49368056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310102926.7A Expired - Fee Related CN103366908B (en) | 2012-03-28 | 2013-03-28 | Overlap effective insulation tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103366908B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114430853A (en) * | 2019-10-21 | 2022-05-03 | 日立能源瑞士股份公司 | Insulator umbrella skirt with non-circular end |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5389734A (en) * | 1991-05-29 | 1995-02-14 | Alcatel N. V. | Device for protecting the end of an electric cable against the effects of insulation breakdown |
| JPH09134628A (en) * | 1995-11-08 | 1997-05-20 | Ngk Insulators Ltd | Polymer insulation tube with its creeping electric field reduced |
| CN1356700A (en) * | 2000-11-21 | 2002-07-03 | 古河电气工业株式会社 | Organic compound insualtor and its manufacture method |
| JP2005251565A (en) * | 2004-03-04 | 2005-09-15 | Ngk Insulators Ltd | Conductive glazed bushing |
| CN201230180Y (en) * | 2008-07-14 | 2009-04-29 | 河南森源电气股份有限公司 | Corona-proof through-wall sleeve construction for 40.5kV electric power distribution system |
| CN201556486U (en) * | 2009-12-02 | 2010-08-18 | 成都长河电器制造有限公司 | Non-uniform resistant electric field insulator |
-
2013
- 2013-03-28 CN CN201310102926.7A patent/CN103366908B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5389734A (en) * | 1991-05-29 | 1995-02-14 | Alcatel N. V. | Device for protecting the end of an electric cable against the effects of insulation breakdown |
| JPH09134628A (en) * | 1995-11-08 | 1997-05-20 | Ngk Insulators Ltd | Polymer insulation tube with its creeping electric field reduced |
| CN1356700A (en) * | 2000-11-21 | 2002-07-03 | 古河电气工业株式会社 | Organic compound insualtor and its manufacture method |
| JP2005251565A (en) * | 2004-03-04 | 2005-09-15 | Ngk Insulators Ltd | Conductive glazed bushing |
| CN201230180Y (en) * | 2008-07-14 | 2009-04-29 | 河南森源电气股份有限公司 | Corona-proof through-wall sleeve construction for 40.5kV electric power distribution system |
| CN201556486U (en) * | 2009-12-02 | 2010-08-18 | 成都长河电器制造有限公司 | Non-uniform resistant electric field insulator |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114430853A (en) * | 2019-10-21 | 2022-05-03 | 日立能源瑞士股份公司 | Insulator umbrella skirt with non-circular end |
| CN114430853B (en) * | 2019-10-21 | 2023-08-22 | 日立能源瑞士股份公司 | Insulator umbrella skirt with non-round end |
| US11923108B2 (en) | 2019-10-21 | 2024-03-05 | Hitachi Energy Ltd | Insulator shed having non-circular tip |
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| CN103366908B (en) | 2016-12-28 |
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Granted publication date: 20161228 Termination date: 20210328 |
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