CN102801123B - 20KV sleeve - Google Patents
20KV sleeve Download PDFInfo
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- CN102801123B CN102801123B CN201210238335.8A CN201210238335A CN102801123B CN 102801123 B CN102801123 B CN 102801123B CN 201210238335 A CN201210238335 A CN 201210238335A CN 102801123 B CN102801123 B CN 102801123B
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- voltage charged
- charged body
- grading shield
- insulating layer
- solid insulating
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Abstract
The invention discloses a 20KV sleeve, which comprises a high-voltage charged body, an equalizing shield, an inserted nut and a solid insulating layer, wherein the high-voltage charged body is a dumbbell-shaped rod body with two large ends; the equalizing shield is an annular shielding mesh cover, is sleeved in the middle of the high-voltage charged body and is coaxial with the high-voltage charged body; a space is formed between the inner wall of the equalizing shield and the high-voltage charged body; the inner diameter of the equalizing shield is 2-4 times of the middle diameter of the high-voltage charged body; the equalizing shield is fixed on the inserted nut through four pins which are uniformly distributed on the outer wall of the equalizing shield; and the solid insulating layer is cast on the high-voltage charged body, the equalizing shield and the inserted nut, so that the solid insulating layer, the high-voltage charged body, the equalizing shield and the inserted nut form the 20KV sleeve. The 20KV sleeve solves the problem of poor dynamic thermal stability of a sleeve with a voltage below a 20KV level, is safe and simple, and reduces noises caused by internal insulation corona discharge due to a non-uniform electric field.
Description
Technical field
The present invention relates to a kind of 20KV sleeve pipe, the cabinet being applicable to high-tension switch cabinet industry is applied.
Background technology
The bus lifting cabinet of existing 20KV uses the wall bushing of 20KV, general top main bus-bar copper bar (high-voltage charged body) is by wall bushing turns over, and bottom insulating supporting is fixed.Top be fixedly by and the bus of cabinet is securing, as shown in Figure 1.
Prior art has following shortcoming:
(1) dynamic thermal stability is bad, the excesssive gap of wall bushing, and cannot fix main bus-bar copper bar (high-voltage charged body), main bus-bar copper bar is fixed in frame, and lower end needs to use insulating supporting.When bearing specified KA Rms, main bus-bar (high-voltage charged body) can swing under electrodynamic effect, wall bushing can be broken, the accidents such as guiding discharge time serious.
(2) the fixing needs of main bus-bar (high-voltage charged body) upper end rely on and cabinet main bus-bar assist fixing, and like this and cabinet main bus-bar will bear the weight of a part of main bus-bar, that is also cabinet main bus-bar is bearing strength.When and cabinet main bus-bar transmission current time mechanical stress the electric field on main bus-bar (high-voltage charged body) will be caused uneven.
(3) 20KV grade main bus-bar copper bar by during wall bushing because the uneven meeting of electric field causes the sound of corona.Although safety is no problem when 20KV normally works, the sound of corona can cause the fear of operating personnel.
(4) wall bushing and main bus-bar (high-voltage charged body) have gap, and high-voltage charged body must consider the problem of creep distance along insulating surfaces, and often in real operation, the air gap is added that the creep distance of wall pipe is used as creep distance by designer, and creep distance is inadequate in fact.
At present a lot of producers are also effective solves above shortcoming, therefore extremely needs that a kind of structure is simple, the bus casing of electric fields uniform to be to bear the function of conductive busbars electric current and insulating supporting.
Summary of the invention
Goal of the invention: for problems of the prior art with not enough, the invention provides that a kind of dynamic thermal stability is good, large distance, corona put the low 20KV sleeve pipe of spot noise.
Technical scheme: a kind of 20KV sleeve pipe, comprises high-voltage charged body, grading shield, embedded nut and solid insulating layer; Described high-voltage charged body is the large dumbbell shape barred bodies in two ends; Described grading shield is ring shielding net; Grading shield is enclosed within the middle part of high-voltage charged body, coaxial with high-voltage charged body; Have spacing between the inwall of described grading shield and high-voltage charged body, and the internal diameter of grading shield is 2-4 times of high-voltage charged body mid diameter; Described grading shield is fixed on embedded nut by the pin that four are uniformly distributed on its external wall; Described solid insulating layer casts on high-voltage charged body, grading shield and embedded nut, thus forms 20KV sleeve pipe with high-voltage charged body, grading shield together with embedded nut.
High-voltage charged body is the large dumbbell shape barred bodies in two ends, large centre, two is little, this dumbbell shape structure is beneficial to solid insulating layer and sticks to firmly on high-voltage charged body, by very large dynamic thermal stability electric current and in short-term peak withstand current time can not produce coming off of solid insulating layer and high-voltage charged body; The design of shielding net, becomes even by the electric field of high-voltage charged body to grounding body, reduces the noise that corona discharge causes.
Described high-voltage charged body is copper high-voltage charged body, and its barred body is cylindric barred body, high-voltage charged body upper port and lower port be all greater than 480mm along face creep distance; Described upper port refers to the upper surface of high-voltage charged body; Lower port refers to the lower surface of high-voltage charged body; The upper surface of high-voltage charged body and lower surface is referred to along the surface of solid insulating layer to the girth of bus casing mounting bracket along face creep distance.Smooth cylindric barred body can reduce the probability of surface tip electric discharge.
Described solid insulating layer is that epoxy insulation resin material is made, described shielding net galvanized steel net.Mesh shields net makes the resin of solid insulating layer through the gap of net, can fix very firm for shielding net.
The outer wall of described solid insulating layer is provided with size full skirt; Wherein large full skirt and little full skirt are spaced.Size full skirt enhances the theory that creep distance employs large umbellule in the design, although ring main unit is used in indoor or case change, but condensation produces possibly under the situation of more harsh secondary severity, gather on the surface of insulator to reduce water droplet, water droplet can slide by size full skirt fast, and the epoxy cast material that solid insulating layer uses hydrophobicity very strong simultaneously substantially increases anti-condensation ability.The use of size full skirt too increases the creep distance along insulating surfaces, and what make upper port and lower port is all greater than 480mm along face creep distance.
Beneficial effect: compared with prior art, 20KV sleeve pipe provided by the present invention, can solve the cased dynamic thermal stability problem of poor of 20KV voltage gradation; According to 2 grades of severities 2 grades design creep age distance, safely, simply; By greatly reducing the unevenness of electric field to the reasonable employment of shielding net, reduce the noise causing interior insulated electro corona because electric field is uneven and cause, almost completely quiet during normal work.Yield rate of the present invention is higher, makes simple and reliable.
Accompanying drawing explanation
Fig. 1 is wall bushing of the prior art and installment state structural representation thereof;
Fig. 2 is the structural representation of the embodiment of the present invention;
Fig. 3 be in the embodiment of the present invention upper port along face creep distance structural representation;
Fig. 4 be in the embodiment of the present invention lower port along face creep distance structural representation;
Fig. 5 is the sectional view of Fig. 2 top view;
Fig. 6 is the structural representation that the embodiment of the present invention removes solid insulating layer;
Fig. 7 is that the embodiment of the present invention is not with grading shield and band grading shield electric field lines comparison diagram; Wherein, (a) is pipe box not with grading shield and electric field line chart thereof; B pipe box that () is band grading shield and electric field line chart thereof.
In figure, 10, top main bus-bar 11, wall bushing 12, insulating supporting 13, gap 20, high-voltage charged body 21, grading shield 22, embedded nut 23, solid insulating layer 24, pin 25, plain washer 26, screw 27, installing plate 30, electric field lines 40, grounding body
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
As seen in figs, copper high-voltage charged body 20 is the large dumbbell shape barred bodies in two ends, and barred body smooth surface; Grading shield 21 is ring shielding net, shielding net galvanized steel net; Grading shield 21 is enclosed within the middle part of high-voltage charged body 20, and coaxial with high-voltage charged body 20; Have spacing between the inwall of grading shield 21 and high-voltage charged body 20, and the internal diameter of grading shield 21 is 2 times of high-voltage charged body 20 mid diameter; Grading shield 21 is fixed on embedded nut 22 by the pin 24 that four are uniformly distributed on its external wall; The solid insulating layer 23 that epoxy insulation resin material is made casts on high-voltage charged body 20, grading shield 21 and embedded nut 22, thus forming 20KV sleeve pipe with high-voltage charged body 20, grading shield 21 together with embedded nut 22, the outer wall of solid insulating layer 23 is provided with size full skirt; Wherein large full skirt and little full skirt are spaced, and what as described in Fig. 3 and 4, the setting of large full skirt and little full skirt made high-voltage charged body 20 upper port and lower port is all greater than 480mm along face creep distance.Although ring main unit is used in indoor or case change, but condensation produces possibly under the situation of more harsh secondary severity, gather on the surface of insulator to reduce water droplet, water droplet can slide by size full skirt fast, and the epoxy cast material that solid insulating layer 23 uses hydrophobicity very strong simultaneously substantially increases anti-condensation ability.The use of size full skirt too increases the creep distance along insulating surfaces.
Before casting epoxy insulation resin, shielding net is fixed on embedded nut 22 by four pins 24, and embedded nut 22 is fixed on mould, this fixed connection effectively and reliably ensure that the locus of shielding net, guarantees the axiality of itself and high-voltage charged body (cylindrical copper rod).The problem that the gauze screen solving common product cannot be located.
High-voltage charged body 20, grading shield 21, embedded nut 3 fixes rear unification and casts, and forms solid insulating layer 23.Formed product after casting.During use, be arranged on the installing plate 27 of grounding body 40, the installing plate 27 of grading shield 21, embedded nut 22, plain washer 25, screw 26 and grounding body 40 connects as one, form bonding system, when high-voltage charged body band high-tension electricity, high pressure will become very even to the electric field of earth electrode system.
In Fig. 5, circular net formation concentric cylinder class slightly uneven electric field of high-voltage charged body 20 and shielding net, this electric field lines sends from high-voltage charged body 20, and direction is to shielding net.This electric field is close to uniform electric field, and horizontal component power line, can not because of the uneven generation point discharge of electric field close to even.
As shown in Figure 7, with the electric field of the even high-voltage charged body 20 pairs of grounding bodies 40 of grading shield 21.And the sleeve structure adding grading shield 21 and do not add grading shield 21 is analyzed.The inhomogeneities of electric field is confined to the very high ate electrode of internal field main ionization process, particularly sends out in the thin layer that the ate electrode that radius of curvature is very little is either large or small.Figure (a) is the structure not with grading shield 21, now the electric field pole of high-voltage charged body 20 pairs of grounding bodies 40 is uneven, grounding body 40 is the zinc-plated plate that 2mm is thick near high-voltage charged body place, the front end of this plate can be similar to and be interpreted as a tip body, radius of curvature is very little, and this electric field is severe non-uniform electric field.During normal work, high-voltage charged body 20 carries out corona discharge facing to this tip, and this electric discharge is enough because of solid insulating layer 23 safe distance, can not puncture insulating barrier, also can not affect normal work, but the sound of corona discharge can be very large.If solid insulating layer 23 itself exists air gap or crack, then this electric field will be breakdown before arrival 65KV.Figure (b) is band grading shield 21 structure of the present invention.Now high-voltage charged body 20 is coaxial with shielding net, for slightly uneven electric field is close to uniform electric field, high-voltage charged body 20 is very even to the electric force lines distribution of grounding body 40, when the industrial frequency withstand voltage experiment being 24KV, when 65KV/1min without puncturing solid insulating layer 23, and 20KV when normally running the sound of corona minimum, without obvious sound.
Claims (4)
1. a 20KV sleeve pipe, is characterized in that: comprise high-voltage charged body (20), grading shield (21), embedded nut (22) and solid insulating layer (23); Described high-voltage charged body (20) is the large dumbbell shape barred body in two ends; Described grading shield (21) is ring shielding net; Grading shield (21) is enclosed within the middle part of high-voltage charged body (20), and coaxial with high-voltage charged body (20); Have spacing between the inwall of described grading shield (21) and high-voltage charged body (20), and the internal diameter of grading shield (21) is 2-4 times of high-voltage charged body (20) mid diameter; Described grading shield (21) is fixed on embedded nut (22) by the pin (24) that four are uniformly distributed on its external wall; Described solid insulating layer (23) casts on high-voltage charged body (20), grading shield (21) and embedded nut (22), thus forms 20KV sleeve pipe together with high-voltage charged body (20), grading shield (21) and embedded nut (22);
High-voltage charged body (20), grading shield (21), embedded nut (22) fixes rear unification and casts, and forms solid insulating layer (23); Formed product after casting; During use, be arranged on the installing plate (27) of grounding body (40), the installing plate (27) of grading shield (21), embedded nut (22), plain washer (25), screw (26) and grounding body (40) connects as one, form bonding system, when high-voltage charged body (20) band high-tension electricity, high pressure will become very even to the electric field of earth electrode system;
Before casting epoxy insulation resin, shielding net is fixed on embedded nut (22) by four pins (24), and embedded nut (22) is fixed on mould.
2. 20KV sleeve pipe as claimed in claim 1, is characterized in that: described high-voltage charged body (20) for copper high-voltage charged body (20), its barred body be cylindric barred body, high-voltage charged body (20) upper port and lower port be all greater than 480mm along face creep distance; Described upper port refers to the upper surface of high-voltage charged body (20); Lower port refers to the lower surface of high-voltage charged body (20); The upper surface of high-voltage charged body (20) and lower surface is referred to along the surface of solid insulating layer (23) to the girth of bus casing mounting bracket along face creep distance.
3. 20KV sleeve pipe as claimed in claim 1, is characterized in that: described solid insulating layer (23) is made for epoxy insulation resin material, described shielding net galvanized steel net.
4. 20KV sleeve pipe as claimed in claim 1, is characterized in that: the outer wall of described solid insulating layer (23) is provided with size full skirt; Wherein large full skirt and little full skirt are spaced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210238335.8A CN102801123B (en) | 2012-07-10 | 2012-07-10 | 20KV sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210238335.8A CN102801123B (en) | 2012-07-10 | 2012-07-10 | 20KV sleeve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102801123A CN102801123A (en) | 2012-11-28 |
| CN102801123B true CN102801123B (en) | 2015-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210238335.8A Active CN102801123B (en) | 2012-07-10 | 2012-07-10 | 20KV sleeve |
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| CN (1) | CN102801123B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810742B (en) * | 2015-05-14 | 2017-04-26 | 安徽明远电力设备制造有限公司 | Condensation preventing device for solid insulated switchgear and manufacturing method of the condensation preventing device |
| CN106251993B (en) * | 2016-08-16 | 2018-03-06 | 华北电力大学 | The preparation method of voltage guide device, locking device and the hydrophobic coat that insulate |
| CN110098583B (en) * | 2019-05-14 | 2021-10-08 | 云南电网有限责任公司电力科学研究院 | Wall bushing and preparation method thereof |
| CN110854774B (en) * | 2019-12-10 | 2021-03-30 | 湖南大北互互感器有限公司 | Wall bushing for series capacitance compensation device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2938507Y (en) * | 2006-07-18 | 2007-08-22 | 上海广电电气（集团）有限公司 | Connection device for wall bushing and ring bus |
| CN201340770Y (en) * | 2008-11-28 | 2009-11-04 | 天水长城开关厂有限公司 | Wall bushing |
| CN201466610U (en) * | 2009-08-14 | 2010-05-12 | 中国西电电气股份有限公司 | Wall bushing with double-shield structure |
| CN201584663U (en) * | 2009-12-16 | 2010-09-15 | 向荣集团有限公司 | Busbar insulating sleeve of 24KV switch cabinet |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2776419B1 (en) * | 1998-03-18 | 2000-06-16 | Pioch Sa | BARRIER DEVICE AND ELECTRICAL WALL CROSSING |
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2012
- 2012-07-10 CN CN201210238335.8A patent/CN102801123B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2938507Y (en) * | 2006-07-18 | 2007-08-22 | 上海广电电气（集团）有限公司 | Connection device for wall bushing and ring bus |
| CN201340770Y (en) * | 2008-11-28 | 2009-11-04 | 天水长城开关厂有限公司 | Wall bushing |
| CN201466610U (en) * | 2009-08-14 | 2010-05-12 | 中国西电电气股份有限公司 | Wall bushing with double-shield structure |
| CN201584663U (en) * | 2009-12-16 | 2010-09-15 | 向荣集团有限公司 | Busbar insulating sleeve of 24KV switch cabinet |
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| Publication number | Publication date |
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| CN102801123A (en) | 2012-11-28 |
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