CN201262864Y - Insulation voltage equalizing ball for ultra-high voltage or extra-high voltage transformer - Google Patents
Insulation voltage equalizing ball for ultra-high voltage or extra-high voltage transformer Download PDFInfo
- Publication number
- CN201262864Y CN201262864Y CNU2008201313198U CN200820131319U CN201262864Y CN 201262864 Y CN201262864 Y CN 201262864Y CN U2008201313198 U CNU2008201313198 U CN U2008201313198U CN 200820131319 U CN200820131319 U CN 200820131319U CN 201262864 Y CN201262864 Y CN 201262864Y
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- insulating paper
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- pure insulating
- cylindrical shell
- voltage equalizing
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Abstract
The utility model discloses an insulating balance ball used for EHV or UHV transformers. The insulating balancing ball is provided with a balance ball, a pure insulating paper cover, pure insulating paper support strips and a pure insulating paper cylinder. The balance ball is provided with a hollow metal sphere and a circular flange. The pure insulating paper cover is closely covered on the outer wall of the metal sphere and is externally sheathed with the pure insulating paper cylinder; furthermore, each pure insulating paper support strip is arranged between the pure insulating paper cover and the pure insulating paper cylinder; the inward end face of each pure insulating paper support strip is adhered and fixed with the pure insulating paper cover and the outward end face of each pure insulating paper support strip is adhered and fixed with the pure insulating paper cylinder. The insulating balance ball enhances the application field-strength of the insulation of transformers, shortens the insulating distance of the extended lead of a transformer sleeve, eliminates hidden danger of the local-discharge of the transformer product, enhances the reliability of the transformer operation and prolongs the service life of the transformer.
Description
Technical field
The utility model relates to a kind of transformer insulated parts, relates in particular to a kind of insulation voltage equalizing ball that is used for superhigh pressure or extra-high voltage transformer.
Background technology
The rated voltage of common EHV transformer is all at 350kV to 500kV, and the rated voltage of extra-high voltage transformer is all at 750kV with more than the 750kV.Because the operating voltage of this class transformer is very high, so some positions in transformer inside, for example the Electric Field Distribution of the cannula tip of outlet is very inhomogeneous, the corona discharge phenomenon appears in the field intensity allowable that tends to surpass owing to local work field intensity insulating material (oil-impregnated paper insulation) itself, not only reduce the transformer reliability of operation, and shortened the working life of transformer.Need place than larger radius of curvature and metallic shield device that be electrically connected with outlet (being commonly called as voltage equalizing ball) in the cannula tip of outlet for this reason, make its Electric Field Distribution on every side be tending towards even, and on the surface of voltage equalizing ball, cover certain thickness insulant, so that improve dielectric strength effectively to voltage equalizing ball.
Voltage equalizing ball all is that the manufacturing works at transformer are fixed on the voltage equalizing ball with the mode of banded crimped paper adding additives according to half-stack package usually.The effective insulation thickness that adopts the resulting insulant of half-stack package technology only is half of actual (real) thickness, and can make transformer oil varnish(ed) paper effectively with adhesive bond, thereby influences insulation effect.Also can there be air gap in the insulant of this structure in insulant inside, and the electrical strength that covers insulation is reduced widely.Pretend under the usefulness at high-tension yard, partial discharge can occur, can not satisfy the specification requirement of superhigh pressure and extra-high voltage transformer product.
Chinese patent CN2664130Y discloses a kind of novel voltage equalizing ball, this voltage equalizing ball comprises and is provided with the loam cake that covers the hole, is provided with the base of bottom outlet and is provided with the flange of mesopore, flange radially be provided with outside boss, be provided with the arc extended surface in the both sides of boss, the upper and lower two sides of boss are contacted with the sidewall of loam cake and base respectively, in the welding of the junction of loam cake, boss and base.But the outer surface that how not to relate at voltage equalizing ball is provided with insulant.
The utility model content
The purpose of this utility model is to overcome the problems referred to above, provide a kind of insulation property better, the less insulation voltage equalizing ball that can be used for superhigh pressure or extra-high voltage transformer that takes up space.
The technical scheme that realizes the utility model purpose is: a kind of insulation voltage equalizing ball that is used for superhigh pressure or extra-high voltage transformer has voltage equalizing ball; Voltage equalizing ball has hollow metal ball body, and this metal ball body has two openings, and one is line outlet, and another is an incoming line; The position of the line outlet of the metal ball body of voltage equalizing ball is the flange concave shape; Voltage equalizing ball also has the annular flange plate of metal material, and ring flange is positioned at metal ball body and is fixed together with the inwall of metal ball body; Its design feature is: also have pure insulating paper cover housing, pure insulating paper stay and pure insulating paper cylindrical shell; Pure insulating paper cover housing closely covers on the outer wall of metal ball body, and pure insulating paper cylindrical shell is enclosed within outside the pure insulating paper cover housing and each pure insulating paper stay is arranged between pure insulating paper cover housing and the pure insulating paper cylindrical shell; The inward end surface of each pure insulating paper stay is bonded and fixed at pure insulating paper cover housing, and the end face outwardly of each pure insulating paper stay is bonded and fixed at pure insulating paper cylindrical shell; Pure insulating paper stay has 4 or 8, and pure insulating paper cylindrical shell is semi-annular shape by cross section half cylindrical shell is made of by binding agent overlap joint bonding is fixing inclined-plane overlapping part separately.
The utlity model has positive effect: (1) insulation voltage equalizing ball of the present utility model is divided into the higher little oil duct of dielectric strength to original big oil duct by increasing the insulation screen, has reduced insulation distance, the overall dimension of the product that dwindles.(2) insulation voltage equalizing ball of the present utility model has improved transformer insulated use field intensity widely, shortened the insulation distance of bushing shell for transformer outlet, eliminate the hidden danger of power transformer product generation partial discharge, improved the transformer reliability of operation, prolonged the working life of transformer.
Description of drawings
Fig. 1 is the structural representation of insulation voltage equalizing ball of the present utility model;
Fig. 2 is the A-A view of Fig. 1;
Fig. 3 is that the manufacturing equipment of the paste pure pulp of the adhesive in the insulation voltage equalizing ball manufacture process of the present utility model connects block diagram.
Embodiment
See Fig. 1 and Fig. 2, the insulation voltage equalizing ball that is used for superhigh pressure or extra-high voltage transformer of the present utility model has pure insulating paper cover housing 6, pure insulating paper stay 7, pure insulating paper cylindrical shell 8 and voltage equalizing ball 9.
Pure insulating paper cover housing 6 closely covers on the outer wall of metal ball body 91, and pure insulating paper cylindrical shell 8 is enclosed within outside the pure insulating paper cover housing 6.The pure insulating paper stay 7 of present embodiment has 8, and each pure insulating paper stay 7 is arranged between pure insulating paper cover housing 6 and the pure insulating paper cylindrical shell 8.The inward end surface of each pure insulating paper stay 7 is bonded and fixed at pure insulating paper cover housing 6, and the end face outwardly of each pure insulating paper stay 7 is bonded and fixed at pure insulating paper cylindrical shell 8.
Pure insulating paper cylindrical shell 8 is semi-annular shape by cross section half cylindrical shell 81,82 is made of by binding agent overlap joint bonding is fixing inclined-plane overlapping part separately, and each overlapping part in two overlapping parts of two and half cylindrical shells 81,82 is bonded and fixed at two end faces outwardly that are in a corresponding pure insulating paper stay 7 of two pure insulating paper stays 7 on the same diameter.
The manufacture method of the insulation voltage equalizing ball that is used for superhigh pressure or extra-high voltage transformer of the present utility model is as follows:
See Fig. 3,1. do not float kp softwood pulp and water is put into hydrabrusher 11 with tabular, under agitation tabular floating after being ground into slurries, kp softwood pulp do not pumped in the reserve pit 12 by first stock pump 51 by waterpower, by second stock pump 52 slurries in the reserve pit 12 are pumped in the scummer 13 and to remove the gred, slurries after the slagging-off enter in two disc pulping machines 14 that series connection is used before and after three subsequently, and the solubility that is milled to the fiber in the slurries by two disc pulping machines 14 is to enter machine chest 15 after 34%～37%.
Slurries in the machine chest 15 are pumped into by the 3rd stock pump 53 carry out slurries in the stuff box 21 and stir, simultaneously water is added the concentration that makes slurries in the stuff box 21 and be diluted to 2.5 ‰～5 ‰.By the 4th stock pump 54 slurries in the stuff box 21 are pumped in the sand trap 22, carry out the sand setting of slurries by triangular prism shaped stopper wherein, and the iron and steel particle in the slurries is attracted on powerful permanent magnet and from slurries, separate by powerful permanent magnet, enter with rear slurry and under the effect of gravity, carry out the desanding second time in the desander 23; After slurries flow out from desander 23, under the effect of gravity, enter in the branch slurry case 23.To make the concentration of slurries be diluted to 1.8 ‰～2.2 ‰ in the water adding branch slurry case 24.
Slurries in minute slurry case 24 are pumped in the gunite gun of cylinder whitewashing former 31 by the 5th stock pump 55, slurries are sprayed onto the adhesive paste paper pulp that forms thin layer on the netted shaping drum by its shower nozzle by gunite gun.The felt band of adhesive paste paper forming device 32 is fitted on the netted shaping drum it by pressure roller in rotation, transfers on the felt band from the adhesive paste paper pulp that will stick to the thin layer on the netted shaping drum rotation.Along with the motion of felt band then is delivered to the cooling cylinder assembly with the adhesive paste paper pulp of thin layer, and be wound onto on the cylinder body of cooling cylinder assembly.When the thin layer adhesive paste paper pulp on being wound on cylinder body reached certain thickness, the cooling cylinder assembly was cut off this adhesive paste paper pulp from the inside to the outside by its cutter, thereby obtained adhesive paste pulp board.Adhesive paste pulp board drops to picking on the platform of the machine of picking 33.From picking that platform takes off or being adhesive paste pure pulp from picking the adhesive paste pulp board that platform falls.
2. the paste pure pulp that 1. obtains with step is that raw material makes insulation pure paper plate, the pure paper plate that will insulate obtains sheet material through opening material, cementing is superimposed with each other to desired thickness again, leaves standstill back hot pressing, leaves standstill on sheet material, composite board is carried out machine work and obtains the pure insulating paper stay 7 of required form.
3. it is stand-by as internal mold to get voltage equalizing ball 9; This voltage equalizing ball 9 has hollow metal ball body 91, and this metal ball body 91 has two openings, and one is line outlet, and another is an incoming line; The position of the line outlet of the metal ball body 91 of voltage equalizing ball 9 is the flange concave shape; Voltage equalizing ball 9 also has the annular flange plate 92 of metal material, and ring flange 92 is positioned at metal ball body 91 and is fixed together with the inwall of metal ball body 91.
4. aluminum or the copper housing got with voltage equalizing ball 9 respective shapes are interior die housing, and interior die housing is provided with two openings, and should in have flowing water aperture when vacuumizing on the wall of die housing, the area of all apertures accounts for 3 ‰ to 1% of internal mold inner walls area; An opening of interior die housing is sealed,, open vacuum pump airtight connection of another opening and vacuum-pumping pipeline of interior die housing; Interior die housing is bedabbled, outer wall wrapping internal layer overcover around interior die housing, the paste pure pulp that 1. step is obtained cover the internal layer overcover outer, carry out repeatedly manual the beating simultaneously, make it to become as requested certain shape in a part of moisture content of air between eliminating paste pure pulp and internal layer overcover and eliminating paste pure pulp inside, become wet plate shape pure pulp and make except that the paste pure pulp, then the elasticity binding strap is tied up outside wet plate shape pure pulp, continued to vacuumize and remove a part of moisture content in the wet plate shape pure pulp; Pull down the elasticity binding strap and check, continue to dewater, and further improve the uniformity coefficient of wet plate shape pure pulp by manual mode of patting repeatedly; For the second time the elasticity binding strap is tied up outside wet plate shape pure pulp then, continued to vacuumize and a period of time of dewatering; Interior die housing is pulled down from vacuum extractor together with wet plate shape pure pulp and elasticity binding strap, be put into and under 60 ℃ to 105 ℃ temperature, carry out drying in the drying equipment and slough moisture content, wet plate shape pure pulp then becomes pure insulating paper spare, places health then until dimensionally stable; Pull down the elasticity binding strap then, pure insulating paper spare is severed become two with cutting tool, and be separated with interior die housing, one of them half cylindrical shell is that available first half cylindrical shell is through stand-by after machine finishing; It is stand-by to make corresponding second half cylindrical shell according to the similar method of making first half cylindrical shell; When making this two and half cylindrical shell, the paste pure pulp is being patted in the process of shaping, to need with the requirement that must touch the mark of the thickness of part, after carrying out fine finishining, the cross section of two and half cylindrical shells 81,82 all is semi-annular shape and is equipped with the inclined-plane overlapping part, and the inclined-plane overlapping part of two and half cylindrical shells 81,82 is corresponding.
5. clean out and be placed on voltage equalizing ball 9 on the workbench, then mould is bedabbled, the paste pure pulp that 1. step obtains is spread deposited covering on the outer surface that comprises flange of voltage equalizing ball 9, pat repeatedly then, after removing a part of moisture content of paste pure pulp and make it to become wet plate shape pure pulp, use the elasticity binding strap that the colligation of wet plate shape pure pulp is good subsequently, place after a period of time removes a part of moisture content, pulling down the elasticity binding strap continues to pat repeatedly, bind the elasticity binding strap again, continue to place after a period of time removes a part of moisture content, put into drying equipment and carry out drying and slough moisture content under 60 ℃ to 105 ℃ temperature, wet plate shape pure pulp then becomes the pure insulating paper cover housing 6 that closely covers on voltage equalizing ball 9 outer surfaces.
6. get 8 pure insulating paper stays 7 that 2. step obtains, all coat binding agent in the inward end surface of each pure insulating paper stay 7 and end face outwardly, then each pure insulating paper stay 7 symmetry is bonded on the outer surface of the pure insulating paper cover housing 6 that 5. step obtain, two and half cylindrical shells 81 that more 4. step obtained, 82 is bonding with corresponding pure insulating paper stay 7 end face outwardly, wherein: two and half cylindrical shells 81, each overlapping part in two inclined-plane overlapping parts of 82 is bonded and fixed at two end faces outwardly that are in a corresponding pure insulating paper stay 7 of two pure insulating paper stays 7 on the same diameter, and two and half cylindrical shells 81,82 also the inclined-plane overlapping part by separately be bonded and fixed at and constitute pure insulating paper cylindrical shell 8 together; Tie up the back with the elasticity binding strap and place, up to the binding agent full solidification.
7. after pulling down the elasticity binding strap, then obtain the voltage equalizing ball that insulate; The voltage equalizing ball that should insulate then obtains finished product after sending the X-ray check machine testing not have metal particle.
Claims (1)
1, a kind of insulation voltage equalizing ball that is used for superhigh pressure or extra-high voltage transformer has voltage equalizing ball (9); Voltage equalizing ball (9) has hollow metal ball body (91), and this metal ball body (91) has two openings, and one is line outlet, and another is an incoming line; The position of the line outlet of the metal ball body (91) of voltage equalizing ball (9) is the flange concave shape; Voltage equalizing ball (9) also has the annular flange plate (92) of metal material, and ring flange (92) is positioned at metal ball body (91) and is fixed together with the inwall of metal ball body (91); It is characterized in that: also have pure insulating paper cover housing (6), pure insulating paper stay (7) and pure insulating paper cylindrical shell (8); Pure insulating paper cover housing (6) closely covers on the outer wall of metal ball body (91), and pure insulating paper cylindrical shell (8) is enclosed within outside the pure insulating paper cover housing (6) and each pure insulating paper stay (7) is arranged between pure insulating paper cover housing (6) and the pure insulating paper cylindrical shell (8); The inward end surface of each pure insulating paper stay (7) is bonded and fixed at pure insulating paper cover housing (6), and the end face outwardly of each pure insulating paper stay (7) is bonded and fixed at pure insulating paper cylindrical shell (8); Pure insulating paper stay (7) has 4 or 8, and pure insulating paper cylindrical shell (8) is semi-annular shape by cross section half cylindrical shell (81,82) is made of by binding agent overlap joint bonding is fixing inclined-plane overlapping part separately.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201313198U CN201262864Y (en) | 2008-05-07 | 2008-07-28 | Insulation voltage equalizing ball for ultra-high voltage or extra-high voltage transformer |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200820035260.2 | 2008-05-07 | ||
| CN200820035260 | 2008-05-07 | ||
| CNU2008201313198U CN201262864Y (en) | 2008-05-07 | 2008-07-28 | Insulation voltage equalizing ball for ultra-high voltage or extra-high voltage transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201262864Y true CN201262864Y (en) | 2009-06-24 |
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ID=40809341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201313198U Expired - Lifetime CN201262864Y (en) | 2008-05-07 | 2008-07-28 | Insulation voltage equalizing ball for ultra-high voltage or extra-high voltage transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201262864Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050251A (en) * | 2012-12-25 | 2013-04-17 | 保定天威集团(江苏)五洲变压器有限公司 | Voltage sharing ball structure of oiled paper condenser type transformer bushing |
| CN107424796A (en) * | 2017-08-16 | 2017-12-01 | 扬州市美华电气有限公司 | A kind of voltage equalizing ball |
| CN109378199A (en) * | 2018-11-20 | 2019-02-22 | 江苏神马电力股份有限公司 | A kind of voltage equalizing ball, bushing shell for transformer and transformer |
-
2008
- 2008-07-28 CN CNU2008201313198U patent/CN201262864Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050251A (en) * | 2012-12-25 | 2013-04-17 | 保定天威集团(江苏)五洲变压器有限公司 | Voltage sharing ball structure of oiled paper condenser type transformer bushing |
| CN107424796A (en) * | 2017-08-16 | 2017-12-01 | 扬州市美华电气有限公司 | A kind of voltage equalizing ball |
| CN107424796B (en) * | 2017-08-16 | 2023-06-23 | 扬州市美华电气有限公司 | Pressure equalizing ball |
| CN109378199A (en) * | 2018-11-20 | 2019-02-22 | 江苏神马电力股份有限公司 | A kind of voltage equalizing ball, bushing shell for transformer and transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170424 Address after: 213000 Jiangsu Province, the clock tower Development Zone, Changzhou Road, No. 385 Co-patentee after: China Electric Power Research Institute Patentee after: Changzhou Yingzhong Electrical Co., Ltd. Address before: 213012 Changzhou, Jiangsu Province, the new road, No. 385 Patentee before: Changzhou Yingzhong Electrical Co., Ltd. |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090624 |
|
| CX01 | Expiry of patent term |