CN103117159A - Large oil-immersed transformer insulated end ring and manufacturing technology thereof - Google Patents
Large oil-immersed transformer insulated end ring and manufacturing technology thereof Download PDFInfo
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- CN103117159A CN103117159A CN2013100633546A CN201310063354A CN103117159A CN 103117159 A CN103117159 A CN 103117159A CN 2013100633546 A CN2013100633546 A CN 2013100633546A CN 201310063354 A CN201310063354 A CN 201310063354A CN 103117159 A CN103117159 A CN 103117159A
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Abstract
The invention discloses a large oil-immersed transformer insulated end ring and a manufacturing technology thereof. The large oil-immersed transformer insulated end ring comprises casein glue layers and a plurality of layers of paperboards, and every two adjacent layers of paperboards are glued via one of the casein glue layer. The manufacturing technology includes: A, utilizing a board shearing machine to shear needed large electrical insulating paperboards into regulated dimension so as to obtain semi-finished paperboards; B, evenly spraying distilled water on the surfaces of the semi-finished paperboards, guaranteeing the paperboards to have certain bending capability, utilizing a roller press to roll the paperboards into cylinders according to technical requirements; and C, selecting casein glue which is strong in permeability on the insulated paperboards to glue the layers of the paperboards according to a single-face gluing technique, tightening the layers of the paperboards via a binding strap, placing in a drying furnace to be subjected to drying and vacuum oil spraying, and finally disassembling the binding strap. The large oil-immersed transformer insulated end ring and the manufacturing technology thereof have the advantages of simple technology, convenience in operation, reliability in performance, and capability of effectively avoiding or greatly reducing of transformer partial discharge magnitude caused by closed air bubbles in insulating parts.
Description
Technical field
The invention belongs to field transformer, relate to a kind of large oil immersed formula insulating end ring of transformer and manufacture craft thereof.
Background technology
In recent years, along with the development of high pressure, ultrahigh voltage power system, the electric pressure of oil-immersed power transformer is required also to increase thereupon, the supply district of transformer constantly enlarges; Play a part voltage of transformation, electric energy transmitting in whole electric power system due to transformer, the quality of transformer quality is directly determining the problem of whole power system power supply reliability and service life.For this reason, the transformer user has higher requirement to the transformer quality, especially the size of the partial discharge quantity of transformer, for example: the GB1094.3-2003 standard code, for ACSD (and/or ACLD) induced voltage test with 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; The transformer user is in order to ensure more reliable, the longer service life of transformer operation, and they explicitly call in technical protocol, under the test voltage of regulation, and local amplification quantity＜100PC, even requirement≤60PC.This is a stern challenge to transformer production manufacturing firm, and its reason is, the one, and transformer built-in electrical insulation structure, wire, lead-in wire, iron core, folder, fuel tank, hardware etc., quantity is too many, and material properties is different.The 2nd, by Transformer Winding heat radiation and dielectric strength and the transformer insulation structure out-of-shape that determines.The 3rd, easily there is defective in the material quality of insulating end ring of transformer, wet goods, as makes moist, pollutes, contains metallic particles etc.The 4th, the electrode shape of transformer inside is irregular, and that is that all right at present is ripe to the control of electric field distribution law.For these reasons, transformer manufactory wants the size of quantitative control partial discharge quantity, can say that difficulty is very large.Run into office and put the product that exceeds standard, can only rule of thumb investigate one by one.
In the past, when making, thicker insulating parts such as carrying out cross-over block, end circle, pressing plate is subjected to the restriction of raw material standards specification and manufacturing equipment, process conditions.Process after often need to be bonding by multi-layer thin cardboard (as: 1.0 ㎜, 1.5 ㎜, 2.0 ㎜, 3.0 ㎜, 4.0 ㎜, 5.0 ㎜, 6.0 ㎜ etc.) according to drawing requirement in transformer manufactory.In order to enhance productivity under the prerequisite of adhesive strength guaranteeing, all coat common glue on adjacent two cardboard faces in bonding process, as white glue with vinyl etc.And, sometimes when gluing uniformity, integrality is not good enough; Consider that simultaneously liquid all has certain interfacial tension, especially jelly, no exception for white glue with vinyl, its surface is due to interfacial tension with evaporate to such an extent that affect meeting and form layer protecting film on its surface in a short period of time in air, and the surface of adding glue is the impurity particle in absorbed air very easily; After the operations such as hot pressing, drying.Easily produce the cavity that is closed by rubber seal, even if transformer oil also is difficult to penetrate into cavity by white glue with vinyl under vacuum condition; Based on this present situation, the air exhausting in cavity not out, transformer oil can ooze.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 electric-field intensity distribution and relative dielectric constant are inversely proportional under the alternating voltage effect, and the electric strength of medium is directly proportional to its relative dielectric constant.The air that is to say the electric strength minimum will bear higher electric field strength.Be easy to occur partial discharge.
In the oil-filled transformer product of former production, cause office to be put in the reason that exceeds standard, because causing, bubble electric discharge accounts for total ratio up to more than 90%, wherein due to vacuum oil technique, only the time that puts cause not the office put, now summed up some ripe experiences when processing, as carry 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 that is closed by rubber seal causes, be a kind of very numerous and diverse work when processing, the one, affect transformer internal electric field skewness many factors; The 2nd, because insulating end ring in transformer is a lot, add bubble in the inside of insulating part, being difficult to judge exactly is concrete which part; The 3rd, the operations such as insulating part of transformer needs repeated removal, assembling, drying, vacuum oil, quietly puts when changing, test, not only waste a large amount of human and material resources, affect production cycle, the delivery date of delaying, the position that even original dielectric strength can be met the demands sustains damage, make the corresponding pilot project of transformer can't pass, finally may cause whole parts to be scrapped and reform.
Summary of the invention
The present invention is in order to make up the deficiencies in the prior art, provide that a kind of technique is simple, easy to operate, dependable performance, can effectively avoid or the bonding insulating part of decrease in large oil immersed formula insulating end ring of transformer and the manufacture craft thereof of the partial discharge quantity that causes of CAB.
The present invention is achieved through the following technical solutions:
Large oil immersed formula insulating end ring of transformer of the present invention is characterized in that: comprise casein glue-line and some layer paperboards, and bonding by the casein glue-line between the adjacent two layers cardboard.
Large oil immersed formula insulating end ring of transformer of the present invention, cardboard comprises four layers, is respectively the ground floor cardboard, second layer cardboard, triplex board, the 4th layer paperboard.
Large oil immersed formula 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 equably distilled water on semi-finished product paperboard pieces surface, guarantee that cardboard has certain crooking ability, then, according to technological requirement, each layer paperboard is rolled onto respectively circle with roller press;
C. next enter the technique for sticking of insulating end ring, select a kind of casein glue strong with the insulating board permeability, and according to the process of single spreading, the ground floor cardboard that rolling is good is placed on the end ring mould of adjusting in advance, and even at its outer surface, put second layer cardboard after brushing one deck casein glue rapidly, tighten typing with binding strap, spontaneous combustion is dry in air, bonding firmly after, pull down binding strap, even at second layer cardboard outer surface again, put triplex board after brushing one deck casein glue fast, the like, at last the insulating end ring that glues is tightened typing with binding strap integral body, put it into and carry out drying and vacuum pouring oil processing in drying oven, pulling down at last binding strap gets final product.
Based on this technique, the characteristics such as the denseness of considering simultaneously casein glue is little, permeability strong, good with the transformer oil compatibility, bonding force is strong, be difficult for forming air chamber when paper plate bonding, even formation air chamber, owing to having adopted single spreading technique, can not form the air chamber that is all sealed by glue, so transformer oil very easily infilters in air chamber by cardboard yet, discharge the air in air chamber, avoided the bubble electric discharge at this place.
The invention has the beneficial effects as follows, technique is simple, easy to operate, practical, dependable performance, can effectively avoid or the bonding insulating part of decrease in the partial discharge quantity that causes of CAB, power transformer product to the low partial discharge of research and production has very important directive significance, is a kind of very effective technological measure that reduces transformer partial discharge quantity when test, operation.This insulating end ring and manufacture craft thereof be conducive to use in 500kV～1000kV AC transformer and HVDC (High Voltage Direct Current) transmission system ± 200kV～± use on the 800kV converter transformer.
Description of drawings
Fig. 1,2,3 is followed successively by front view, the vertical view of insulating end ring, the A-A cutaway view schematic diagram (of the present invention and traditional is identical) of Fig. 2, Fig. 4 is the I place enlarged drawing of Fig. 3, in the insulating end ring that the present invention makes when adopting single spreading technique, casein glue face between the adjacent two layers cardboard and the air chamber that wherein forms, the sealing of the casein glue that this air chamber has not been solidified, transformer oil can enter air chamber through insulating board smoothly smoothly.Fig. 5 is the I place enlarged drawing of Fig. 3, in the insulating end ring of making when adopting traditional two-sided coating technique, white glue with vinyl interface between the adjacent two layers cardboard and the air chamber that wherein forms, this air chamber is because the sealing transformer oil of the white glue with vinyl of having been solidified can not enter air chamber by insulating board.
In figure, 1-casein glue-line, 2-the 4th layer paperboard, 3-triplex board, 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 immersed formula insulating end ring of transformer of the present invention comprises casein glue-line 1 and some layer paperboards, and is bonding by the casein glue-line between the adjacent two layers cardboard.Select the number of plies of cardboard according to the thickness of drawing and cardboard used.
Large oil immersed formula insulating end ring of transformer of the present invention, preferred version are that cardboard comprises four layers, is respectively ground floor cardboard 5, second layer cardboard 4, the triplex board 3, the four layer paperboards 2.
The manufacture craft of large oil immersed formula insulating end ring of transformer of the present invention comprises the following steps:
A. at first according to drawing requirement, with plate shearing machine with certain thickness, cleaning, mechanical strength is high, electrical strength is high, compression ratio is little, a large eleatrical insulating board of standard specification is cut into given size, becomes semi-finished product;
B. secondly, spray equably distilled water (high-purity, free from foreign meter and metal ion etc.) two to three times on semi-finished product paperboard pieces surface, time interval controls will guarantee that finally cardboard has certain crooking ability about 2 hours, and after bending, wrinkle resistant, flawless etc.; Then, respectively ground floor cardboard, second layer cardboard, triplex board and the 4th layer paperboard are rolled onto circle with roller press according to technological requirement;
C. next enter the technique for sticking of insulating end ring, by research, test, analyze and select a kind of casein glue strong with the insulating board permeability, and according to the process of single spreading (namely on the surface of two insulating part joints, gluing on surface therein only, another surface is the process of gluing not), the ground floor cardboard 5 that rolling is good is placed on the end ring mould of adjusting in advance, even in strict accordance with technological requirement at ground floor cardboard outer surface (being outside diameter), put second layer cardboard 4 after brushing one deck casein glue rapidly, tighten typing with binding strap, spontaneous combustion is dry 1 hour in air, bonding firmly after, pull down binding strap, even at second layer cardboard 4 outer surfaces (being outside diameter) again, put triplex board 3 after brushing one deck casein glue fast, the like, at last the insulating end ring that glues is tightened typing with binding strap integral body, put it into and carry out drying and vacuum pouring oil processing in drying oven, pulling down at last binding strap gets final product.Then can carry out the deep processings such as chamfering, deburring.
Large oil immersed formula insulating end ring of transformer of the present invention and manufacture craft thereof, technique is simple, easy to operate, can effectively avoid or the bonding insulating part of decrease in the partial discharge quantity that causes of the CAB that forms, power transformer product to the low partial discharge quantity of research and production has very important directive significance, be conducive to use in 500kV～1000kV AC transformer and HVDC (High Voltage Direct Current) transmission system ± 200kV～± use on the 800kV converter transformer.
Claims (3)
1. a large oil immersed formula insulating end ring of transformer, is characterized in that: comprise casein glue-line (1) and some layer paperboards, pass through the casein glue-line between the adjacent two layers cardboard bonding.
2. large oil immersed formula insulating end ring of transformer manufacture craft according to claim 1, it is characterized in that: cardboard comprises four layers, is respectively ground floor cardboard (2), second layer cardboard (3), triplex board (4), the 4th layer paperboard (5).
3. large oil immersed formula insulating end ring of transformer manufacture craft claimed in claim 1 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 equably distilled water on semi-finished product paperboard pieces surface, guarantee that cardboard has certain crooking ability, then, according to technological requirement, each layer paperboard is rolled onto respectively circle with roller press;
C. next enter the technique for sticking of insulating end ring, select a kind of casein glue strong with the insulating board permeability, and according to the process of single spreading, the ground floor cardboard that rolling is good is placed on the end ring mould of adjusting in advance, and even at its outer surface, put second layer cardboard after brushing one deck casein glue rapidly, tighten typing with binding strap, spontaneous combustion is dry in air, bonding firmly after, pull down binding strap, even at second layer cardboard outer surface again, put triplex board after brushing one deck casein glue fast, the like, at last the insulating end ring that glues is tightened typing with binding strap integral body, put it into and carry out drying and vacuum pouring oil processing in drying oven, pulling down at last binding strap gets final product.
Priority Applications (1)
| 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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| 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 true CN103117159A (en) | 2013-05-22 |
| CN103117159B CN103117159B (en) | 2016-03-02 |
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Cited By (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 |
| CN107351455A (en) * | 2017-08-25 | 2017-11-17 | 山东输变电设备有限公司 | A kind of couch board hot-press method |
| 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 |
| CN114050051A (en) * | 2022-01-13 | 2022-02-15 | 山东电力设备有限公司 | Full-automatic bonding device and method for end ring cushion block of transformer |
| CN114571799A (en) * | 2022-03-04 | 2022-06-03 | 潍坊汇胜绝缘技术有限公司 | Preparation method of high-thickness large-size coiled 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 |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
Cited By (8)
| 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 |
| CN107351455A (en) * | 2017-08-25 | 2017-11-17 | 山东输变电设备有限公司 | A kind of couch board hot-press method |
| 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 |
| CN114050051A (en) * | 2022-01-13 | 2022-02-15 | 山东电力设备有限公司 | Full-automatic bonding device and method for end ring cushion block of 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 |
| CN114571799A (en) * | 2022-03-04 | 2022-06-03 | 潍坊汇胜绝缘技术有限公司 | Preparation method of high-thickness large-size coiled electrostatic ring framework |
| 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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| CN103117159B (en) | 2016-03-02 |
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