CN104505236A - Shielding case at tail of condenser bushing on +/-400kV converter transformer valve side - Google Patents
Shielding case at tail of condenser bushing on +/-400kV converter transformer valve side Download PDFInfo
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- CN104505236A CN104505236A CN201410796509.1A CN201410796509A CN104505236A CN 104505236 A CN104505236 A CN 104505236A CN 201410796509 A CN201410796509 A CN 201410796509A CN 104505236 A CN104505236 A CN 104505236A
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- oval camber
- elliptical arc
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Abstract
The invention discloses a shielding case at the tail of a condenser bushing on a +/-400kV converter transformer valve side. The shielding case has an axial symmetrical structure; a cross section of the shielding case consists of an elliptical arc (ab), an elliptical arc (bc), an elliptical arc (cd) and an elliptical arc (de) which are sequentially connected with one another from top to bottom; the elliptical arc (ab) is an elliptical arc which is positioned in a second quadrant in a coordinate system of which the x axis and the y axis are a long axis and a short axis of a first ellipse respectively; the elliptical arc (bc) is an elliptical arc which is positioned in a first quadrant in a coordinate system of which the x axis and the y axis are a along axis and a short axis of a second ellipse respectively; the elliptical arc (cd) is an elliptical arc which is positioned in a fourth quadrant in a coordinate system of which the x axis and the y axis are a long axis and a short axis of a third ellipse respectively; and the elliptical arc (de) is an elliptical arc which is positioned in a third quadrant in a coordinate system of which the x axis and the y axis are a long axis and a short axis of a fourth ellipse respectively. The shielding case is reasonable in structure, the electric field intensity of a surface of the shielding case is reduced, electric fields are distributed on the surface of the shielding case uniformly, local discharging on the surface of the shielding case is restrained, and the reliability of internal insulation of the condenser bushing on the converter transformer valve side is obviously improved.
Description
[technical field]
The invention belongs to insulation technology field in high-voltage direct-current transmission system, be specifically related to one ± 400kV converter transformer valve-side condenser-type terminal afterbody radome.
[background technology]
High-voltage commutation transformer value side bushing is the key equipment in DC transmission system, and its effect is reduction, even electric field between high-voltage current conductor and converter transformer.Along with the rising of electric pressure, the requirement of power equipment operational reliability is also increased severely day by day.Wherein, the advantages such as condenser-type terminal, stable electric property excellent with it and explosion-proof flame-retardant, volume be little, lightweight become the outstanding figure in converter transformer bushings.The interior insulation system of ± 400kV converter transformer valve-side condenser-type terminal is complicated and stand the test of high voltage electric field for a long time, if the unreasonable safe and stable operation that can threaten sleeve pipe and converter transformer of design.A large amount of field operation experiences shows: sleeve pipe fault accounts for 30% of converter transformer fault, and the accidents such as the flashover of sleeve pipe, blast generally all come from interior insulated local discharge, therefore need appropriate design sleeve pipe afterbody radome.
As shown in Figure 6 a, the Electric Field Distribution on radome surface as shown in Figure 7 for the Electric Field Distribution of existing ± 400kV converter transformer valve-side condenser-type terminal afterbody; Can find out that the electric field strength on radome surface is 4500-6329Vmm
-1, mean value is 5400Vmm
-1, the higher and skewness of electric field strength, easily produces partial discharge.
[summary of the invention]
The object of the present invention is to provide one ± 400kV converter transformer valve-side condenser-type terminal afterbody radome, to solve the higher and skewness of existing ± 400kV converter transformer valve side condenser-type terminal afterbody radome surface field intensity, easily produce the deficiency of partial discharge; Radome of the present invention comparatively conventional shields surface field intensity is lower and distribution is comparatively even, in order to conduct ± 400kV converter transformer valve-side condenser-type terminal afterbody screening arrangement, can improve the interior insulating reliability of sleeve pipe.
To achieve these goals, the present invention adopts following technical scheme:
One ± 400kV converter transformer valve-side condenser-type terminal afterbody radome, this radome is axially symmetric structure; Its cross section is made up of the oval camber line ab connected successively from top to bottom, oval camber line bc, oval camber line cd and oval camber line de.
Preferably, oval camber line ab is the first ellipse with its major axis and minor axis for being positioned at the oval camber line of the second quadrant in coordinate system; Oval camber line bc is the second ellipse with its major axis and minor axis for being positioned at the oval camber line of first quartile in coordinate system; Oval camber line cd is the 3rd ellipse with its major axis and minor axis for being positioned at the oval camber line of fourth quadrant in coordinate system; Oval camber line de is the 4th ellipse with its major axis and minor axis for being positioned at the oval camber line of third quadrant in coordinate system.
Preferably, be in the rectangular coordinate system of millimeter in unit, the central coordinate of circle of the first ellipse is (180,240), semi-major axis long 50, semi-minor axis long 35; The central coordinate of circle of the second ellipse is (180,0), semi-major axis long 275, semi-minor axis long 225; The central coordinate of circle of the 3rd ellipse is (240,0), semi-major axis long 165, semi-minor axis long 160; 4th ellipse central coordinate of circle be (240 ,-100), semi-major axis is long by 80, semi-minor axis long 60; In described rectangular coordinate system, y-axis is the rotating shaft of radome, and x-axis is perpendicular to y-axis and by the tie point c of oval camber line bc and oval camber line cd.
Relative to prior art, the present invention has following beneficial effect: the shape of the present invention to existing ± 400kV converter transformer valve-side sleeve afterbody radome is improved, and simulation calculation has been carried out to the radome surface electric field distribution before and after optimizing, prove the rational in infrastructure of of the present invention ± 400kV converter transformer valve-side sleeve afterbody radome, reduce radome surface field intensity, achieve surface electric field distribution homogenizing, suppress radome surface that partial discharge occurs, significantly improve ± interior the insulating reliability of 400kV converter transformer valve-side condenser-type terminal.
[accompanying drawing explanation]
Fig. 1 is the present invention ± 400kV converter transformer valve-side condenser-type terminal afterbody radome cross sectional representation;
Fig. 2 is the present invention ± 400kV converter transformer valve-side condenser-type terminal afterbody radome normal axomometric drawing.
Fig. 3 is the present invention ± 400kV converter transformer valve-side condenser-type terminal afterbody radome top view.
Fig. 4 is view under the present invention ± 400kV converter transformer valve-side condenser-type terminal afterbody radome.
Fig. 5 is the present invention ± 400kV converter transformer valve-side condenser-type terminal afterbody radome front view.
Fig. 6 a is the distribution map of the electric field of existing ± 400kV converter transformer valve-side condenser-type terminal afterbody.
Fig. 6 b is the distribution map of the electric field of the present invention ± 400kV converter transformer valve-side condenser-type terminal afterbody.
Fig. 7 is the Electric Field Distribution comparison diagram on the rear radome surface with optimization before optimizing.
[embodiment]
Refer to shown in Fig. 1 to Fig. 5, one of the present invention ± 400kV converter transformer valve-side condenser-type terminal afterbody radome is axially symmetric structure; Its cross section is made up of the oval camber line ab connected successively from top to bottom, oval camber line bc, oval camber line cd and oval camber line de.Oval camber line ab is the first ellipse with its major axis and minor axis for being positioned at the oval camber line of the second quadrant in coordinate system; Oval camber line bc is the second ellipse with its major axis and minor axis for being positioned at the oval camber line of first quartile in coordinate system; Oval camber line cd is the 3rd ellipse with its major axis and minor axis for being positioned at the oval camber line of fourth quadrant in coordinate system; Oval camber line de is the 4th ellipse with its major axis and minor axis for being positioned at the oval camber line of third quadrant in coordinate system.
Be that in the rectangular coordinate system of millimeter, (y-axis is the rotating shaft of radome in unit, x-axis is perpendicular to y-axis and by the tie point c of oval camber line bc and oval camber line cd), the central coordinate of circle of the first ellipse is (180,240), semi-major axis long 50, semi-minor axis long 35; The central coordinate of circle of the second ellipse is (180,0), semi-major axis long 275, semi-minor axis long 225; The central coordinate of circle of the 3rd ellipse is (240,0), semi-major axis long 165, semi-minor axis long 160; 4th ellipse central coordinate of circle be (240 ,-100), semi-major axis is long by 80, semi-minor axis long 60.
The oval camber line ab connected successively, oval camber line bc, oval camber line cd and oval camber line de just define one of the present invention ± 400kV converter transformer valve-side condenser-type terminal afterbody radome object line around y-axis rotating 360 degrees.
Refer to shown in Fig. 6 b and Fig. 7, the electric field strength on radome surface of the present invention is 1600-2221Vmm
-1, mean value is 2100Vmm
-1, electric field strength is lower and distribution is comparatively even, relative to the structure of existing radome, greatly reduces the possibility that partial discharge occurs.
Claims (3)
1. ± 400kV converter transformer valve-side condenser-type terminal afterbody radome, it is characterized in that, this radome is axially symmetric structure; Its cross section is made up of the oval camber line ab connected successively from top to bottom, oval camber line bc, oval camber line cd and oval camber line de.
2. one according to claim 1 ± 400kV converter transformer valve-side condenser-type terminal afterbody radome, is characterized in that, oval camber line ab is the first ellipse with its major axis and minor axis for being positioned at the oval camber line of the second quadrant in coordinate system; Oval camber line bc is the second ellipse with its major axis and minor axis for being positioned at the oval camber line of first quartile in coordinate system; Oval camber line cd is the 3rd ellipse with its major axis and minor axis for being positioned at the oval camber line of fourth quadrant in coordinate system; Oval camber line de is the 4th ellipse with its major axis and minor axis for being positioned at the oval camber line of third quadrant in coordinate system.
3. one according to claim 2 ± 400kV converter transformer valve-side condenser-type terminal afterbody radome, it is characterized in that, be in the rectangular coordinate system of millimeter in unit, the central coordinate of circle of the first ellipse is (180,240), semi-major axis long 50, semi-minor axis long 35; The central coordinate of circle of the second ellipse is (180,0), semi-major axis long 275, semi-minor axis long 225; The central coordinate of circle of the 3rd ellipse is (240,0), semi-major axis long 165, semi-minor axis long 160; 4th ellipse central coordinate of circle be (240 ,-100), semi-major axis is long by 80, semi-minor axis long 60; In described rectangular coordinate system, y-axis is the rotating shaft of radome, and x-axis is perpendicular to y-axis and by the tie point c of oval camber line bc and oval camber line cd.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410796509.1A CN104505236A (en) | 2014-12-18 | 2014-12-18 | Shielding case at tail of condenser bushing on +/-400kV converter transformer valve side |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410796509.1A CN104505236A (en) | 2014-12-18 | 2014-12-18 | Shielding case at tail of condenser bushing on +/-400kV converter transformer valve side |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104505236A true CN104505236A (en) | 2015-04-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410796509.1A Pending CN104505236A (en) | 2014-12-18 | 2014-12-18 | Shielding case at tail of condenser bushing on +/-400kV converter transformer valve side |
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| CN (1) | CN104505236A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0676665A (en) * | 1992-08-27 | 1994-03-18 | Ngk Insulators Ltd | Gas bushing |
| CN101425369A (en) * | 2008-05-07 | 2009-05-06 | 常州市英中电气有限公司 | Insulation voltage equalizing ball used for super-high or extra-high voltage transformer and production process thereof |
| EP2133970A1 (en) * | 2008-06-10 | 2009-12-16 | Abb Research Ltd. | Device for decreased risk of dielectric breakdown in high voltage apparatuses |
| CN201594465U (en) * | 2009-12-25 | 2010-09-29 | 中国西电电气股份有限公司 | Electronic high-voltage direct current transformer |
-
2014
- 2014-12-18 CN CN201410796509.1A patent/CN104505236A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0676665A (en) * | 1992-08-27 | 1994-03-18 | Ngk Insulators Ltd | Gas bushing |
| CN101425369A (en) * | 2008-05-07 | 2009-05-06 | 常州市英中电气有限公司 | Insulation voltage equalizing ball used for super-high or extra-high voltage transformer and production process thereof |
| EP2133970A1 (en) * | 2008-06-10 | 2009-12-16 | Abb Research Ltd. | Device for decreased risk of dielectric breakdown in high voltage apparatuses |
| CN201594465U (en) * | 2009-12-25 | 2010-09-29 | 中国西电电气股份有限公司 | Electronic high-voltage direct current transformer |
Non-Patent Citations (3)
| Title |
|---|
| 刘鹏等: "特高压交流套管尾部均压球结构优化研究", 《西安交通大学学报》 * |
| 张国强等: "高压套管均压球电极形状优化的研究", 《中国电机工程学报》 * |
| 张施令等: "用改进粒子群神经网络混合算法优化特高压油气套管均压球结构", 《高电压技术》 * |
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Application publication date: 20150408 |