CN1133184C - Transformer with thin insulating layer and deposited filler resin and its making method - Google Patents
Transformer with thin insulating layer and deposited filler resin and its making method Download PDFInfo
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- CN1133184C CN1133184C CN 98104919 CN98104919A CN1133184C CN 1133184 C CN1133184 C CN 1133184C CN 98104919 CN98104919 CN 98104919 CN 98104919 A CN98104919 A CN 98104919A CN 1133184 C CN1133184 C CN 1133184C
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- coil
- air flue
- tension coil
- glass fiber
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Abstract
The present invention belongs to the technical field of transformers. The present invention is characterized in that an iron core is a step lamination, a precast moulding glass fiber positioning net or glass fiber rope mesh grid is in encapsulated layers on the inner and the outer walls of a high-voltage coil, and the thickness of each encapsulated layer is less than 3 millimeters; the high-voltage coil is wound by being divided into more than eight sections according to voltage grades, and a middle tap is used for tapping; a low-voltage coil is a foil coil which is cast into a full-encapsulated type honeycomb gas passage. The present invention has the characteristics of low cost, no pollution, etc., and all electric indexes accord with national standards. The present invention can be widely used for transformers below 10000 KVA in the stage of 10 to 35KV.
Description
The present invention relates to a kind of resin manufacture thin layer with the band filler and seal the manufacture method of insulation pouring transformer, it is applicable to makes the following transformer of 10-35KV level 10000KVA.
At present, of home make dry-type transformer 0.5KV level low-voltage coil or be that the paper tinsel formula is not poured into a mould, and adopt the way of end envelope; Pour into a mould, it is not a foil coil just, but the wire wound coil.The both exists drawback.
Adopt paper tinsel formula end envelope person, just the foil coil both ends of coiled are carried out the way of local caburizing in air, solid envelope is carried out at the low-voltage coil both ends, this kind form can not accomplish that coil is hermetically sealed.Thereby, be installed in unshakable in one's determination going up after, be easy to make moist, to such an extent as to insulation resistance descend, unprocessed, do not reach the standard of inspecting for acceptance before putting into operation, to such an extent as to that the way that also will take to dry is removed is moist, improve insulation resistance.And employing wire wound cast person, though solved the sealed damp-proof problem, but because the helical angle of wire wound when existing coil and rolling, the axial reactance that makes high-voltage coil and low-voltage coil is highly uneven and produce bigger stray field, thereby produce bigger electric power, this can not show a candle to foil coil with regard to the mechanical strength that means the wire wound coil.
And the high-tension coil of existing insulation resin casting dry type transformer, great majority are with not pouring into a mould with the resin of filler, put into the glass fiber weak point in advance at the inside and outside wall of coil and interlayer and cut felt and nonwoven fabrics, under the state of vacuum, pour into a mould with the casual method of annotating, it has following defective: the glass fiber dust looses and flies whole working space during (1) coiling, cause the work situation severe contamination, jeopardize labourer's psychosomatic health; (2) lip-deep glass fiber felt is not easy to soak into fully resin, causes color and luster irregular, and product appearance is not attractive in appearance, even produces the hole, influences the product electric property; (3) consumption of resin is big, causes product cost valency height; (4) since the glass fiber weak point to cut the non-directional and conductive coefficient of felt less, unfavorable to dispelling the heat, thus influence the insulating material of the radiator structure of product and the thermal endurance class of having relatively high expectations; (5) crack performance easily takes place in the manufacture process, mechanical strength is subjected to certain limitation, thereby influences the electrical strength of product, even jeopardizes product useful life, thereby should not make medium-sized or above transformer.
Though the producer that has has also adopted the filler resin cast, make heavy insulation and seal the transformer of sealing two kinds of structures with thin insulating, but owing to make the heavy insulation person that seals the coil, no enhancement measures, unreasonable structure, it can only be aluminum conductor that material is selected, volume is big, consumptive material is many, can only make the coil of aluminum conductor, and pour mass very easily ftractures, directly jeopardize product useful life, the machinery of product, electric and the insulation high-temperature capability all to hang down a class, to such an extent as to this type product has lost competitiveness, eliminated by the user gradually.And also make the thin insulating person that seals the coil at present, though structurally adopt thin insulating cast form, but its manufacturing process can not make lead soak into resin fully, the requirement that interior insulation does not reach the regulation thermal endurance class, the rate of deposition of filler too greatly not only makes heat conductivility can not get improving, occur the interface on the contrary and cause the possibility of be full of cracks, influence the useful life of product too.
The purpose of this invention is to provide a kind of manufacture method that filler resin thin insulating cast transformer is arranged, the low-voltage coil of this transformer has high mechanical strength and humidity resistance, high-tension coil has high mechanical properties, high electric strength, high insulation high-temperature capability and low-loss, low noise, and cost is low, and production environment is pollution-free, and product is specious.
The present invention is achieved in that
Iron core is the stepping lamination; Low-voltage coil is the total incapsulation type that foil coil pours into the honeycomb fashion air flue, prefabricated profiled glass fiber network for location or the mesh grid of glass fiber rope are arranged in the high-tension coil inside and outside wall encapsulated layer, encapsulated layer thickness is below 3 millimeters, high-tension coil is looked electric pressure and is divided into coiling more than 8 sections, and the middle part tap is as tap.
Low-voltage coil is by foil or electromagnetic wire coiling, during the coiling foil coil, pack in advance can the demoulding behind epoxy resin cure internal mold and air flue mould, external mold and base are installed again, after the injection ring epoxy resins pours, make the paper tinsel formula low-voltage coil of total incapsulation.In it, external mold is all made with the book steel plate, and the air flue mould then is that the stripe board of general same width dimensions is made, and the air flue stay is formed by space cast between the air flue mould stripe board.The poured with epoxy resin compound can be packless, also can be Packed.When adopting no filler, inside and outside wall should be placed the glass fiber felt; When employing had filler, inside and outside wall was placed the glass fiber network for location.The prefabricated profiled glass fiber network for location of its high-tension coil is the flexible grid of pre-preg F grade resins under vacuum state, it must be placed on the inwall and the air flue inside and outside wall of high-tension coil pouring ladle seal, the high-tension coil outer wall can be placed this network for location, also can place the mesh grid of treated glass fiber rope, the lead of high-tension coil is to use the copper magnet wire coiling that has suitable insulation, no layer insulation, each line segment of high-tension coil is when adopting the coiling of circle copper magnet wire, topping wire is in the space between the following layer conductor, during vacuum pouring, adopt filled resin mixture, the rate of deposition of filler should be controlled less than 1%, again through handling, make the total incapsulation high-tension coil of F level thermal endurance class after the vacuum pouring greater than 2 above atmospheric pressures.
2500KVA can not establish air flue in following high-tension coil inside, and when 2500KVA and above high-tension coil inside were provided with air flue, it was general bar template die that its air flue waters injection molding.
Because low-voltage coil of the present invention is the cast of paper tinsel formula, it had both had the high characteristics of foil coil mechanical strength, had the good advantage of molded coil humidity resistance again; Its high-tension coil adopts prefabricated profiled glass fiber network for location, pour into the insulating barrier of sealing of similar reinforced concrete structure, so both overcome and to have adopted the glass fiber weak point to cut felt when producing and problem such as the environmental pollution that brings and heat radiation be bad, improved the mechanical strength of coil again; It adopts following technological means again simultaneously, and high-tension coil pour mass thickness is descended significantly, and heat dispersion improves, and cost reduces: (1) adopts the segmentation coiling, and voltage between layers is controlled in the electromagnetic wire insulation safety voltage, need not layer insulation; When (2) justifying the copper magnet wire coiling, topping wire is in the space between the following layer conductor; (3) place prefabricated profiled glass fiber network for location in the encapsulated layer, make the encapsulated layer reduced thickness, the pressurized treatments measure can make resin impregnation turn-to-turn insulation, and partial discharge quantity is reduced to bottom line.
Below in conjunction with drawings and Examples the present invention is further described:
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the structural representation of high-tension coil of the present invention.
Fig. 3 is the lamination schematic diagram of iron core of the present invention.
Fig. 4 is the structural representation of low-voltage coil of the present invention.
Fig. 5 is the A-A generalized section of Fig. 4.
Unshakable in one's determination 1, high-tension coil 2, low-voltage coil 3, insulating cylinder 4 (during 10KV need not), core clamping 5, dolly or base 6, glass fiber network for location 201, sectional coil 202, terminal 203, internal mold 301, air flue mould 302, external mold 303, base 304, sealing gasket 305, screw rod 306, line segment (I), line segment (II).In order to improve radiating effect, small-sized axial flow fan can be installed in both sides, high and low pressure coil lower end, it is forced the blowing cooling.
Structural representation Fig. 2 when high-tension coil of the present invention does not have inner air flue.The every phase coil of high pressure is a segmentation modified model cake formula 202, and the middle part tap is as tap, and with copper magnet wire or foil coiling, the head and the tail head is drawn at the coil two ends, and what of hop count will be determined by intersegmental voltage, intersegmental distance, electromagnetic wire insulation, every section voltage between layers.When voltage between layers did not surpass the safe puncture voltage of electromagnetic wire insulation, interlayer can be without other insulating material; When adopting circle enamel-cover electromagnetic wire, topping wire should be in the space between the following layer conductor.In coil, outer wall is placed the glass fiber moulding network for location 201 of pre-soaked resin respectively, perhaps place the mesh grid of treated glass fiber rope at outer wall, intact back of coiling and the coil through putting in order are installed in the casting mold, under vacuum state, injection has silica flour or other can be used as the mixture of epoxy resins of filler, after plus-pressure is handled, carry out solidification process again, handle after the demoulding.
When high-tension coil inside need be provided with ventilating air passage because of the heat radiation requirement, mentioned above principle is still followed in high-tension coil segmentation coiling, head and the tail head and tap are stayed outermost, the air flue inside and outside wall must be placed preimpregnation moulding network for location, air flue is the universal bar template die of wide 50 millimeter, and casting mold should help air flue bar template die and transfer to after curing.
The 45 degree mitres that adopt unshakable in one's determination, the stepping lamination is seen core lamination schematic diagram 3, with the colligation of plexiglas silk braid over braid.
Electromagnetism according to product of the present invention calculates principle, can be reduced in the resistance of F class F insulation thermal endurance class regulation with the interior heat load of high and low pressure coil unit are that makes at 2500KVA, and do not establish inner air flue of high pressure and suitable low pressure air flue, can calculate simultaneously eddy current loss and lead-in wire loss in the high and low pressure coil respectively, and noise A weighted sound pressure level numerical value unshakable in one's determination.All technical parameter and requirement meet the GB/T10228-1997 standard.
For example: 1000KVA, 10/0.4KV, the transformer technology economic index of impedance 6% is as follows:
Rated capacity: 1000KVA, 3 phases, 50 He Zhi
Rated voltage combination and tapping range: 10 ± 2 * 2.5%/0.4KV
Connect deck label: Y, yno or D, yn11
Impedance voltage: 6%
The insulation thermal endurance class: the F level type of cooling: AN, other is furnished with forced air cooling FN
Industrial frequency withstand voltage: high pressure 35-38KV/ low pressure 3KV
High-pressure side lightning impulse voltage: all-wave 75KV
Partial discharge quantity: less than 5PC
No-load loss: 2000 watts (2210 watts of standards)
No-load current: 0.5% (standard 1.4%)
Load loss: 9300 watts (9560 watts of standards)
Total losses: 11300 watts (11770 watts of standards)
High-tension coil temperature rise: 86K (standard 100K)
Low-voltage coil temperature rise: 90K (standard 100K)
Temperature rise: 91K (standard 100K) unshakable in one's determination
Noise: 60dB (standard 64dB)
Copper magnet wire and paper tinsel are heavy: 853Kg
Silicon steel sheet is heavy: 1725Kg
Content of epoxy resin: 55kg
Silica flour consumption: 55kg
Gross weight: 2980kg
In sum, the present invention has the following advantages: (1) insulation thermal endurance class reach the F level, and the high-tension coil surface have a narrow range of temperature perfect heat-dissipating; (2) product can be sealed insulation, again can the thorough impregnation built-in electrical insulation, and electrical strength reaches bears industrial frequency withstand voltage 35-38KV/3KV, surge voltage 75KV; (3) reinforcement of similar armored concrete makes mechanical strength can bear 17-25 times of short-circuit current rush not ftracture in 0.5 second; (4) zero load, load loss and noise all are lower than national newest standards; (5) material cost and other insulation resin products ratio, low about 5%; (6) production environment is eliminated the pollution of glass fiber dust.
Claims (2)
1, a kind of manufacture method that filler resin thin insulating cast transformer is arranged, it is characterized in that its low-voltage coil (3) is by foil or electromagnetic wire coiling, during the coiling foil coil, pack in advance can the demoulding behind epoxy resin cure internal mold (301) and air flue mould (302), external mold (303) and base (304) are installed again, after the injection ring epoxy resins pours, make the paper tinsel formula low-voltage coil of total incapsulation, in it, external mold is all made with sheet metal, air flue mould (302) then is that the stripe board of general same width dimensions is made, the air flue stay is formed by space cast between the air flue mould stripe board, the poured with epoxy resin compound is Packed, inside and outside wall is placed the glass fiber network for location, the prefabricated profiled glass fiber network for location (201) of its high-tension coil (2) is the flexible grid of pre-preg F grade resins under vacuum state, it must be placed on the inwall and the air flue inside and outside wall of high-tension coil (2) pouring ladle seal, high-tension coil (2) outer wall can be placed this network for location, also can place glass fiber rope mesh grid through handling, the lead of high-tension coil (2) is to use the copper magnet wire coiling that has insulation, no layer insulation, each line segment of high-tension coil (2) is when adopting the coiling of circle copper magnet wire, topping wire is in the tangent external arc space of the every adjacent two circle round conductors of lower floor, during vacuum pouring, adopt filled resin mixture, the rate of deposition of filler should be controlled less than 1%, again through handling, make the total incapsulation high-tension coil of F level thermal endurance class after the vacuum pouring greater than 2 above atmospheric pressures.
2, the method for claim 1 is characterized in that following high-tension coil (2) inside of 2500KVA can not establish air flue, and 2500KVA and above high-tension coil (2) are when inside is provided with air flue, and it is general bar template die that its air flue waters injection molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98104919 CN1133184C (en) | 1998-01-09 | 1998-01-09 | Transformer with thin insulating layer and deposited filler resin and its making method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98104919 CN1133184C (en) | 1998-01-09 | 1998-01-09 | Transformer with thin insulating layer and deposited filler resin and its making method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1222746A CN1222746A (en) | 1999-07-14 |
| CN1133184C true CN1133184C (en) | 2003-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98104919 Expired - Fee Related CN1133184C (en) | 1998-01-09 | 1998-01-09 | Transformer with thin insulating layer and deposited filler resin and its making method |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101937759A (en) * | 2010-09-13 | 2011-01-05 | 无锡亿能电力设备有限公司 | Structure of high-voltage coil for dry-type transformer |
| CN102064005B (en) * | 2010-10-13 | 2012-03-07 | 山东泰开箱变有限公司 | Maintainable novel dry type transformer special for offshore wind power |
| CN102054578B (en) * | 2010-10-29 | 2013-02-20 | 东莞市华胜展鸿电子科技有限公司 | Method for casting full-resin transformer coil |
| CN103117156B (en) * | 2013-03-01 | 2016-12-28 | 重庆祥龙电气有限公司 | A kind of epoxy resin enclosed dry-type transformer of special construction |
| CN103617886B (en) * | 2013-11-18 | 2015-12-30 | 广西南宝特电气制造有限公司 | A kind of manufacture method of three-dimensional winding iron core resin insulating dry type transformer insulating cylinder |
| CN103943351B (en) * | 2014-04-29 | 2016-07-13 | 天津维可特电力科技有限公司 | Dry-type transformer band filler high pressure winding group mould pouring technology |
| CN106847482A (en) * | 2017-03-23 | 2017-06-13 | 江西特种变压器厂 | One kind has transverse air channel high pressure molded coil transformer and its manufacture method |
| CN108447671A (en) * | 2018-01-22 | 2018-08-24 | 山东电力设备有限公司 | A kind of reactor iron core cake casting tooling and casting method |
| CN111768959B (en) | 2019-04-01 | 2022-03-08 | 台达电子企业管理（上海）有限公司 | Transformer device |
| CN111768947B (en) | 2019-04-01 | 2023-03-24 | 台达电子企业管理（上海）有限公司 | Transformer and method for manufacturing the same |
| CN111768960B (en) | 2019-04-01 | 2022-02-18 | 台达电子企业管理（上海）有限公司 | Potting box and transformer |
-
1998
- 1998-01-09 CN CN 98104919 patent/CN1133184C/en not_active Expired - Fee Related
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| CN1222746A (en) | 1999-07-14 |
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