CN103117159B - Large Oil immersion insulating end ring of transformer and manufacture craft thereof - Google Patents
Large Oil immersion insulating end ring of transformer and manufacture craft thereof Download PDFInfo
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- CN103117159B CN103117159B CN201310063354.6A CN201310063354A CN103117159B CN 103117159 B CN103117159 B CN 103117159B CN 201310063354 A CN201310063354 A CN 201310063354A CN 103117159 B CN103117159 B CN 103117159B
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Abstract
Large Oil immersion insulating end ring of transformer of the present invention, comprises casein glue-line and some layer paperboards, bonding by casein glue-line between adjacent two layers cardboard.Manufacture craft comprises the following steps: a required large eleatrical insulating board is cut into given size by A. plate shearing machine, becomes semi-finished product; B. spray distilled water equably on the surface in semi-finished product paperboard pieces, guarantee that cardboard has certain crooking ability, according to technological requirement, each layer paperboard is rolled onto circle respectively with roller press; C. the casein glue strong with insulating board permeability is selected, according to the process of single spreading, bonding each layer paperboard, and tighten sizing with binding strap, put it in drying oven and carry out drying and vacuum pouring oil processing, binding strap of finally dismantling.The invention has the beneficial effects as follows, technique is simple, easy to operate, dependable performance, can effectively avoid or significantly reduce the partial discharge of transformer amount that CAB in bonding insulating part causes.
Description
Technical field
The invention belongs to field transformer, relate to a kind of Large Oil immersion insulating end ring of transformer and manufacture craft thereof.
Background technology
In recent years, along with the development of high pressure, extra-high voltage Force system, require also to increase to the electric pressure of oil-immersed power transformer, the supply district of transformer constantly expands thereupon; Because transformer plays a part voltage of transformation, electric energy transmitting in whole electric power system, the quality of transformer quality directly decides the problem of whole power system power supply reliability and service life.For this reason, transformer user has higher requirement to transformer quality, especially the size of the partial discharge quantity of transformer, such as: GB1094.3-2003 standard specifies, for ACSD (and/or ACLD) induced voltage test of band measurement of partial discharge, according to testing regulations, at U=1.3
under (alternate) voltage, partial discharge quantity is not more than 300PC; At U=1.5
/
(relatively), under voltage, partial discharge quantity is not more than 500PC; Transformer user runs more reliable, longer service life in order to ensure transformer, and they explicitly call in technical protocol, under the test voltage of regulation, and partial enlargement amount <100PC, even requirement≤60PC.This is a stern challenge concerning transformer production manufacturing firm, and its reason is, one is inside transformer insulation system, wire, lead-in wire, iron core, folder, fuel tank, hardware etc., and quantity is too many, and material properties is different.Two is the transformer insulation structure out-of-shapes determined by Transformer Winding heat radiation and dielectric strength.Three is easy existing defects of material quality of insulating end ring of transformer, wet goods, as made moist, polluting, containing metallic particles etc.Four is that the electrode shape of inside transformer is irregular, also immature at present to the control of electric field distribution law.For these reasons, transformer manufacturing factory wants the size of quantitative controls local discharge capacity, can say that difficulty is very large.Run into office and put the product exceeded standard, can only rule of thumb investigate one by one.
In the past, carrying out cross-over block, insulating part that end circle, pressing plate etc. is thicker is subject to raw material standards specification when making and manufacturing equipment, process conditions restriction.Often need to be formed by multi-layer thin cardboard (as: 1.0 ㎜, 1.5 ㎜, 2.0 ㎜, 3.0 ㎜, 4.0 ㎜, 5.0 ㎜, 6.0 ㎜ etc.) bonding aft-loaded airfoil according to drawing requirement in transformer manufacturing factory.In order to enhance productivity under the prerequisite ensureing adhesive strength in bonding process, common glue is all coated, as white glue with vinyl etc. in adjacent two cardboard faces.And, sometimes when gluing uniformity, integrality is not good enough; Consider that liquid all has certain interfacial tension simultaneously; especially jelly; no exception for white glue with vinyl; its surface is due to interfacial tension with evaporate impact can form layer protecting film on its surface in a short period of time in atmosphere, the impurity particle of the surface of adding glue very easily in absorbed air; After the operation such as hot pressing, drying.The cavity that easy generation is closed by rubber seal, even if transformer oil is also difficult to penetrate into cavity by white glue with vinyl under vacuum; Based on this present situation, not out, transformer oil can ooze the air row in cavity.Relative dielectric constant in conjunction with transformer oil is about 2.3, the relative dielectric constant of insulating board is about 4.5, the relative dielectric constant of air is about 1, and under alternating voltage effect, electric-field intensity distribution and relative dielectric constant are inversely proportional to, and the electric strength of medium corresponding thereto dielectric constant be directly proportional.That is the air that electric strength is minimum will bear higher electric field strength.Be easy to partial discharge occurs.
In the former oil-filled transformer product produced, in the reason causing office to be put exceeding standard, total ratio is accounted for up to more than 90% because bubble electric discharge causes, the office wherein caused not due to vacuum oil technique, the only time that puts puts, now summarized the experience of some maturations when processing, as carried out Circulation and Hot Oil Spray, long-time no-load running, proper extension is quiet puts the time etc.But for the partial discharge that the air in the cavity closed by rubber seal causes, be a kind of very numerous and diverse work when processing, one is affect inside transformer non-uniform electric many factors; Two is because insulating end ring in transformer is a lot, adds the inside of bubble at insulating part, and being difficult to judge exactly is which part concrete; The operations such as three is insulating part of transformers needs repeated removal, assembling, drying, vacuum oil when changing, quietly put, test, not only waste a large amount of human and material resources, affect production cycle, the delivery date of delaying, the position even likely making original dielectric strength meet the demands sustains damage, the corresponding pilot project of transformer be can't pass, whole component exhaustion finally may be caused to reform.
Summary of the invention
The present invention, in order to make up the deficiencies in the prior art, provides that a kind of technique is simple, easy to operate, dependable performance, can effectively avoid or significantly reduce Large Oil immersion insulating end ring of transformer and the manufacture craft thereof of the partial discharge quantity that in bonding insulating part, CAB causes.
The present invention is achieved through the following technical solutions:
Large Oil immersion insulating end ring of transformer of the present invention, is characterized in that: comprise casein glue-line and some layer paperboards, bonding by casein glue-line between adjacent two layers cardboard.
Large Oil immersion insulating end ring of transformer of the present invention, cardboard comprises four layers, is respectively ground floor cardboard, second layer cardboard, third layer cardboard, the 4th layer paperboard.
Large Oil immersion insulating end ring of transformer manufacture craft of the present invention, is characterized in that: comprise the following steps:
A. according to drawing requirement, with plate shearing machine, a required large eleatrical insulating board is cut into given size, becomes semi-finished product;
B. spray distilled water equably on the surface in semi-finished product paperboard pieces, guarantee that cardboard has certain crooking ability, then, according to technological requirement, each layer paperboard is rolled onto circle respectively with roller press;
C. the technique for sticking of insulating end ring is next entered, select a kind of casein glue strong with insulating board permeability, and according to the process of single spreading, ground floor cardboard good for rolling is placed on the end ring mould adjusted in advance, and it is even at its outer surface, second layer cardboard is put rapidly after brushing one deck casein glue, sizing is tightened with binding strap, spontaneous combustion is dry in atmosphere, bonding firmly after, pull down binding strap, even at second layer cardboard outer surface again, third layer cardboard is put fast after brushing one deck casein glue, the like, finally the insulating end ring binding strap entirety glued is tightened sizing, put it in drying oven and carry out drying and vacuum pouring oil processing, finally pull down binding strap.
Based on this technique, consider that the denseness of casein glue is little simultaneously, permeability be strong, with the feature such as transformer oil compatibility is good, bonding force is strong, not easily air chamber is formed when paper plate bonding, even if formation air chamber, owing to have employed single spreading technique, also can not form the air chamber all closed by glue, so transformer oil very easily infilters in air chamber by cardboard, discharge the air in air chamber, avoid the bubble electric discharge at this place.
The invention has the beneficial effects as follows, technique is simple, easy to operate, practical, dependable performance, effectively can avoid or significantly reduce the partial discharge quantity that in bonding insulating part, CAB causes, having very important directive significance to the power transformer product of the low partial discharge of research and production, is the very effective technological measure of one reducing transformer partial discharge quantity when test, operation.This insulating end ring and manufacture craft thereof be conducive to using in 500kV ~ 1000kV AC transformer and HVDC (High Voltage Direct Current) transmission system ± 200kV ~ ± 800kV converter transformer on apply.
Accompanying drawing explanation
Fig. 1,2,3 is followed successively by the A-A cutaway view schematic diagram (of the present invention with traditional is identical) of the front view of insulating end ring, vertical view, Fig. 2, Fig. 4 is the I place enlarged drawing of Fig. 3, the present invention adopts in the insulating end ring made during single spreading technique, casein glue face between adjacent two layers cardboard and the air chamber wherein formed, closing of the casein glue that this air chamber not have cured, transformer oil can enter air chamber through insulating board smoothly smoothly.Fig. 5 is the I place enlarged drawing of Fig. 3, adopt in the insulating end ring made during traditional two-sided coating technique, white glue with vinyl interface between adjacent two layers cardboard and the air chamber wherein formed, this air chamber does not enter air chamber by insulating board due to the closed transformer oil of the white glue with vinyl that be have cured.
In figure, 1-casein glue-line, 2-the 4th layer paperboard, 3-third layer cardboard, 4-second layer cardboard, 5-ground floor cardboard, 6-air chamber, 7-Virgin's milk glue-line.
Embodiment
Accompanying drawing is a kind of specific embodiment of the present invention.
Large Oil immersion insulating end ring of transformer of the present invention, comprises casein glue-line 1 and some layer paperboards, bonding by casein glue-line between adjacent two layers cardboard.The number of plies of cardboard is selected according to the thickness of drawing and cardboard used.
Large Oil immersion insulating end ring of transformer of the present invention, preferred version is, cardboard comprises four layers, is respectively ground floor cardboard 5, second layer cardboard 4, third layer cardboard the 3, four layer paperboard 2.
The manufacture craft of Large Oil immersion insulating end ring of transformer of the present invention, comprises the following steps:
A. first according to drawing requirement, with plate shearing machine by certain thickness, clean, mechanical strength is high, electrical strength is high, compression ratio is little, a large eleatrical insulating board for standard specification is cut into given size, becomes semi-finished product;
B. secondly, spray distilled water (high-purity, free from foreign meter and metal ion etc.) on the surface equably two to three times in semi-finished product paperboard pieces, time interval controls, at 2 hours, finally will guarantee that cardboard has certain crooking ability, and bending after, wrinkle resistant, flawless etc.; Then, respectively ground floor cardboard, second layer cardboard, third layer cardboard and the 4th layer paperboard are rolled onto circle with roller press according to technological requirement;
C. the technique for sticking of insulating end ring is next entered, by research, test, analyze and select a kind of casein glue strong with insulating board permeability, and according to the process of single spreading (i.e. on the surface of two insulating part joints, only gluing on a surface wherein, the process of another surface not gluing), ground floor cardboard 5 good for rolling is placed on the end ring mould adjusted in advance, even in strict accordance with technological requirement at ground floor cardboard outer surface (i.e. outside diameter), second layer cardboard 4 is put rapidly after brushing one deck casein glue, sizing is tightened with binding strap, dry 1 hour of spontaneous combustion in atmosphere, bonding firmly after, pull down binding strap, even at second layer cardboard 4 outer surface (i.e. outside diameter) again, third layer cardboard 3 is put fast after brushing one deck casein glue, the like, finally the insulating end ring binding strap entirety glued is tightened sizing, put it in drying oven and carry out drying and vacuum pouring oil processing, finally pull down binding strap.Then the deep processing such as chamfering, deburring can be carried out.
Large Oil immersion insulating end ring of transformer of the present invention and manufacture craft thereof, the partial discharge quantity that technique is simple, easy to operate, effectively can avoid or significantly reduce the CAB that formed in bonding insulating part to cause, to the power transformer product of the low partial discharge quantity of research and production, there is very important directive significance, be conducive to using in 500kV ~ 1000kV AC transformer and HVDC (High Voltage Direct Current) transmission system ± 200kV ~ ± 800kV converter transformer on apply.
Claims (1)
1. a Large Oil immersion insulating end ring of transformer, is characterized in that: comprise casein glue-line (1) and some layer paperboards, bonding by casein glue-line between adjacent two layers cardboard; Cardboard comprises four layers, is respectively ground floor cardboard (2), second layer cardboard (3), third layer cardboard (4), the 4th layer paperboard (5);
Insulating end ring manufacture craft comprises the following steps:
A. according to drawing requirement, with plate shearing machine, a required large eleatrical insulating board is cut into given size, becomes semi-finished product;
B. spray distilled water equably on the surface in semi-finished product paperboard pieces, guarantee that cardboard has certain crooking ability, then, according to technological requirement, each layer paperboard is rolled onto circle respectively with roller press;
C. the technique for sticking of insulating end ring is next entered, select a kind of casein glue strong with insulating board permeability, and according to the process of single spreading, ground floor cardboard good for rolling is placed on the end ring mould adjusted in advance, and it is even at its outer surface, second layer cardboard is put rapidly after brushing one deck casein glue, sizing is tightened with binding strap, spontaneous combustion is dry in atmosphere, bonding firmly after, pull down binding strap, even at second layer cardboard outer surface again, third layer cardboard is put fast after brushing one deck casein glue, the like, finally the insulating end ring binding strap entirety glued is tightened sizing, put it in drying oven and carry out drying and vacuum pouring oil processing, finally pull down binding strap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310063354.6A CN103117159B (en) | 2013-02-28 | 2013-02-28 | Large Oil immersion insulating end ring of transformer and manufacture craft thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310063354.6A CN103117159B (en) | 2013-02-28 | 2013-02-28 | Large Oil immersion insulating end ring of transformer and manufacture craft thereof |
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| CN103117159A CN103117159A (en) | 2013-05-22 |
| CN103117159B true CN103117159B (en) | 2016-03-02 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104916430A (en) * | 2015-07-09 | 2015-09-16 | 中国北车集团大连机车车辆有限公司 | Locomotive transformer insulation end ring humidifying treatment method |
| CN105206409A (en) * | 2015-10-23 | 2015-12-30 | 昆明耀龙置信变压器制造有限公司 | Production process of oil-immersed transformer |
| CN107351455B (en) * | 2017-08-25 | 2020-02-04 | 山东输变电设备有限公司 | Hot pressing method for multilayer paperboard |
| CN111761881A (en) * | 2020-06-29 | 2020-10-13 | 江苏华辰变压器股份有限公司 | Manufacturing process of paperboard cylinder for transformer |
| CN114050051B (en) * | 2022-01-13 | 2022-04-15 | 山东电力设备有限公司 | Full-automatic bonding device and method for end ring cushion block of transformer |
| CN114571799B (en) * | 2022-03-04 | 2023-11-24 | 潍坊汇胜绝缘技术有限公司 | Preparation method of high-thickness large-size rolled electrostatic ring framework |
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| US3902674A (en) * | 1973-11-09 | 1975-09-02 | Gen Instrument Corp | Core supporting and rotating assembly |
| CN1428797A (en) * | 2001-12-28 | 2003-07-09 | 新疆特变电工股份有限公司 | Method for making oblique end ring of transformer |
| CN101236832A (en) * | 2007-12-05 | 2008-08-06 | 西安电力机械制造公司 | A making technology for end ring |
| CN101670688A (en) * | 2009-10-19 | 2010-03-17 | 保定天威集团有限公司 | Novel processing technique of paper board cylinder |
| CN202711935U (en) * | 2012-06-03 | 2013-01-30 | 衡阳市新鑫电力特种变压器有限公司 | End ring of transformer coil |
-
2013
- 2013-02-28 CN CN201310063354.6A patent/CN103117159B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3902674A (en) * | 1973-11-09 | 1975-09-02 | Gen Instrument Corp | Core supporting and rotating assembly |
| CN1428797A (en) * | 2001-12-28 | 2003-07-09 | 新疆特变电工股份有限公司 | Method for making oblique end ring of transformer |
| CN101236832A (en) * | 2007-12-05 | 2008-08-06 | 西安电力机械制造公司 | A making technology for end ring |
| CN101670688A (en) * | 2009-10-19 | 2010-03-17 | 保定天威集团有限公司 | Novel processing technique of paper board cylinder |
| CN202711935U (en) * | 2012-06-03 | 2013-01-30 | 衡阳市新鑫电力特种变压器有限公司 | End ring of transformer coil |
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