CN1257937A - Nm-class crystal alloy-iron core for precise current transformer and its making method - Google Patents
Nm-class crystal alloy-iron core for precise current transformer and its making method Download PDFInfo
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- CN1257937A CN1257937A CN 99124249 CN99124249A CN1257937A CN 1257937 A CN1257937 A CN 1257937A CN 99124249 CN99124249 CN 99124249 CN 99124249 A CN99124249 A CN 99124249A CN 1257937 A CN1257937 A CN 1257937A
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Abstract
A nm-class crystal alloy iron core for precise current transformer is made through proportioning raw material, vacuum smelting, non-vacuum melting of ingots, casting strip, rolling, winding, thermal annealing and examination. It features that in the non-vacuum melting of ingots, the new ingot, nm-class crystal and oxidized material (greater than 20%) are mixed, and in the thermal annealing step pre-heating for inoculation and quick cooling after raising temp are used. Its advantages are light weight, low cost, better static and dynamic magnetic properties and easy debug and installation.
Description
The present invention relates to a kind of inducer iron core, particularly disclose a kind of precision current mutual inductor nano-crystalline alloy iron core and manufacture method thereof, belong to essential electronic element.
In the electric utility, the iron core that is used in the precision current mutual inductor that everybody knows, because service requirements, to the performance requriements height of ferromagnetic material, initial permeability μ
0〉=5 * 10
4, low-coercivity and medium magneticsaturation value Bs about≤1.0T, the core material that this specific character permalloy is best suited for always, however permalloy cost an arm and a leg, stress sensitive, the production cycle is long, has said uneconomic shortcoming from the commodity angle.The late nineteen eighties, Japanese Patent discloses the nanometer crystal alloy technology, its alloy compositions Fe73.5CU
1Nb
3Si13.5B
9The excellent magnetic of this nanometer crystal alloy, attracted a large amount of scientific research and development research, comprising the alloy ingredient weave construction, however anisotropic process technology and practical application or the like will realize a large amount of stable product productions, and a difficult problem is a lot, they mainly show 1) the nanometer crystal alloy thermal treatment temp be difficult to control, product percent of pass is low.2) initial permeability is not high, and homogeneity of product is poor.3) poor toughness of alloy, weak point around above three aspects, later foreign literature has report nanometer gold alloy improving the thermal treatment process stability approach and improving alloy magnetic permeability method and the quench research of attitude amorphous band flexible method of raising, for example day disclosure is speciallyyed permit communique (flat 3-146615,1991-06-21) reach (flat 1-290744,1989.11.12), the laboratory study that they some are a large amount of, though obtain many very useful experimental datas, but as instructing large-scale products production, it is significantly not enough that laboratory test data seems, that is to say that the excellent magnetic that patent proposes will be put to be extensive goods that it has a long way to go.
Purpose of the present invention is to disclose a kind of nanocrystalline iron core of precision current mutual inductor and manufacture method thereof of being used for, and makes the initial permeability μ of nanocrystalline iron core
0〉=5 ten thousand, magneticsaturation value Bs≤1.0T, the current transformer of nanocrystalline iron core are applied in 110KV, 220KV circuit, and measuring accuracy is more than 0.2 grade, instrument security factor Fs≤5.
The present invention realizes purpose like this, as measuring the level current transformer core, its material should have high permeability, higher magneticsaturation high resistivity, its service performance should comprise that technology is easy, reasonable price, be subjected to temperature, vibration, good stability behind the stress influence, its quality product repeatability of scale production is good, form the one continuous line line that forms a complete production network by Production Flow Chart, selected key equipment: 25Kg vacuum induction melting, guarantee that mother metal one nanometer crystal alloy is pure, accurate, even, 50Kg three packet modes revolve casting machine, guarantee to make the accurate accent inspection of band process parameter, vacuum annealing furnace, foundation is the large-scale of feature and small size vacuum annealing device with the product specification, the burner hearth samming head of district 700～1000mm, furnace temperature is (fluctuating≤3 ℃) accurately, the nanocrystalline raw material of manufacture craft of the nanocrystalline iron core of above equipment: iron, ferro-boron, silicon metal, copper and niobium are pressed ratio of component Fe: Cu: Nb: Si: B=73.5: 1: 3: 13.5: 9 vacuum meltings, the antivacuum fusing of ingot, the Cast Strip, rolling, iron core winding, heat-treatment of annealing, detect flow processs such as packing, its feature nanocrystalline virgin material and mix through this material of oxidation in the antivacuum melting process of described nanometer crystal alloy uses (promptly through the nanometer crystal alloy of oxidation, down together), this material score 〉=20% through oxidation, band make heat-treatment of annealing operation behind the iron core be provided with incubation period warm and heating and heat preservation after fast-cooling technology, 430 ℃～470 ℃ of annealing preheating temperatures incubation period, soaking time 20～60 minutes, after be warmed up to 500 ℃～565 ℃, be incubated 60 minutes, process fast cold takes to push open the thermal source stove after the thermal treatment, and iron core is cold soon in the dawn at stove.Nanocrystalline iron core is provided with protective case, and protective case is divided into shell block, cap two parts, is provided with the circle ring of anti-shielding after flap closes up, and the protective case material adopts the metal cast aluminium, and so nanocrystalline iron core can reach initial permeability μ
0〉=5 ten thousand, magneticsaturation value Bs≤1.0T, nanometer crystal alloy virgin material and mix through this material of oxidation and to use, obtain iron core ideal excitation curve and the loss angle curve can meet the current transformer service requirements, this is a principal character of the present invention, and its principle is that Nb, Si generate Nb in (1) alloy after oxidation
2O
3, SiO
2After pushing into Deng these oxide compounds of metal oxide, make alloy monolithic depart from accurate minute composition, can cause saturated magnetic strength to descend to some extent, (2) have oxide particle in the alloy after, make alloy in heat treatment process, can promote separating out of nano-scale particle, help forming fairly perfect nanometer crystal alloy.Nanocrystalline iron core magnetic stability essence is a comprehensive index, it is except the raw material melting, outside the system band factor, heat treatment step after the fabrication of iron core is very much important, preheating in the heat treatment step, insulation, heat up, insulation and the last fast cold technology of stove that pushes away, guarantee that this technological process adopts the produce line of one continuous line, the qualitative control of key equipment, carry out in strict accordance with above-mentioned processing requirement, it provides important evidence for stably manufactured, the iron core protective case of making of the metal cast aluminium that the present invention is provided with, reasonably solved the stress of iron core and carry in vibration, collision problem.
Accompanying drawing 1 is a kind of current transformer core vertical view of the present invention.
Accompanying drawing 2 is the view of iron core longitudinal cross-section.
Accompanying drawing 3 is an iron core protective case seat cross sectional view.
Accompanying drawing 4 is iron core protective case lid cross sectional view.
Accompanying drawing 5 is nano-crystalline alloy iron core B-H of the present invention and B-μ curve.
Embodiment: the precision current transformer iron core is produced by following technical process, iron core raw material (iron, ferro-boron, silicon metal, copper and niobium), by set of dispense than Fe: Cu: Nb: Si: B=73.5: 1: 3: 13.5: 9, vacuum melting.Antivacuum stove fusing, Cast Strip, rolling, iron core winding, vacuum annealing, detection, packing, vanning are dispatched from the factory.Usually raw material is in fix-point-enterprise, quality can be guaranteed, raw material melting in the 25kg vacuum induction furnace, ingot casting 17Kg, change system band workshop section then over to, alloy pig is when the non-vacuum induction furnace heat fused, and the nanocrystalline virgin material of alloy pig mixes use with nanocrystalline this material through oxidation, this material through oxidation accounts for 30%, make strip thickness 0.03～0.035mm, wide 20～30mm is rolled into the iron core of core dimensions Φ 90 * Φ 130 * 20～30mm, iron core is through vacuum annealing thermal treatment, incubation period, temperature was 450 ℃, was incubated 40 minutes, was warming up to 540 ℃ again, be incubated 60 minutes, the back has a power failure and to push the thermal source stove open, and iron core is at stove fast cold iron core finished product in the dawn, and the iron core protective case adopts the ZL104 casting aluminium material to make, protective case is divided into shell block (1), cap (2) two parts are formed, be a cover staving after closing up, seam crossing forms the circle ring (3) of antimagnetic shield, protective case outside diameter Φ 137mm, interior diameter Φ 83mm, the height H=38mm after the protective case flap closes up.
The present invention has realized the quick system band and the excellent physical characteristic nano-crystalline alloy iron core of ultracrystallite material, nanocrystalline iron core of the present invention and permalloy iron core are made comparisons, with the 220KV current transformer is example, iron core Φ 210 * Φ 250 * 50mm, 600 ampere-turns are listed as follows: table (1)
| Output 25VA, 0.2 grade of precision, instrument security factor Fs≤5 | ||||||||
| Product | Weight (Kg) | ?Bs(T) | ?Tc(k) | Manufacturability | 0.2 level is transferred dress | ????Fs ????(≤) | Qualification rate | Price (unit/only) |
| The nanocrystalline iron core of the present invention | ????3.5 | ??1.0 | ??843 | The good cycle is short | Easily | ????5 | High | ????1100 |
| The permalloy iron core | ????4.5 | ??0.75 | ??573 | It is long to be difficult for the cycle | Can | ????5 | High | ????1700 |
By table (1) find out that the nanocrystalline iron core of the present invention is in light weight, price is than permalloy low 1/3.
Accompanying drawing 5 is the B-H of product of the present invention and B-μ curve, and product of the present invention and conventional high magnetic conduction permalloy and the contrast of ultramicro-crystal alloy excitation property are listed as follows: table (2)
| ??B(Gs) | ?????????????H(mA/cm) | ????????????H(m oe) | ???????????μ(×10 4) | ||||||
| ??A 5 | ????P | Specially | ??A 5 | ??P | Specially | ????A 5 | ??P | Specially | |
| ??100 | ??1.43 | ????0.9 | ????0.9 | ??1.787 | ??1.125 | ??1.125 | ????5.6 | ??8.9 | ????8.8 |
| ??1000 | ??6.75 | ????6.5 | ????4 | ??8.44 | ??8.125 | ??5 | ????11.8 | ??12.3 | ????20 |
| ??2000 | ??9.64 | ????11 | ????6 | ??12 | ??13.75 | ??7.5 | ????16.6 | ??14.5 | ????26 |
| ??4000 | ??13.65 | ????20 | ????8 | ??17 | ??25 | ??10 | ????23.5 | ??16 | ????40 |
| ??5000 | ??16.3 | ????35 | ????9 | ??20.4 | ??43.75 | ??11.25 | ????24 | ??11.5 | ????44 |
| ??6000 | ??19.1 | ????50 | ????10 | ??24 | ??62.5 | ??12.5 | ????25 | ??9.6 | ????48 |
| ??10000 | ??69.6 | ????- | ????89 | ??87 | ???- | ??111.25 | ????11.5 | ???- | ????9 |
Annotate: A
5: conventional ultramicro-crystal alloy iron core
P: permalloy iron core
Specially: product iron core of the present invention
By last table (2) μ of 1. conventional ultramicro-crystal alloy iron core as can be seen
MaxBe worth corresponding magnetic strength value and be 0.6T and the μ of alloy-iron core of the present invention
MaxThe also corresponding magnetic strength value of value is 0.6T μ of the present invention
MaxBut be much higher than conventional product μ
Max(promptly 48 * 10
4To 25 * 10
4).2. the μ of old product permalloy iron core
MaxBeing worth corresponding magnetic strength value is 0.4T, μ
MaxValue also is lower than conventional ultramicro-crystal alloy iron core.
B-H, B-μ curve by accompanying drawing 5 see, the Bs of product of the present invention is less than 1.0T, this strong guarantee the strict demand of 0.2 grade of transformer iron core Fs≤5, and the Bs1.25～1.3T of conventional ultramicro-crystal alloy.
This shows that the present invention has improved the iron core magnetic properties, brief operation, reduce cost that the Bs of iron core of the present invention, Fc are all excellent, quiet, the dynamic magnetic characteristic is used stable all goodly, the frock debugging easily, and is with short production cycle, can satisfy the requirement of Fs≤5.Can be in the industrialness scale production, product current transformer of the present invention is applied on 110KV, the 220KV circuit, has good society, economic benefit.
Claims (7)
1. one kind is used for precision current mutual inductor nano-crystalline alloy iron core manufacture method, manufacturing process comprises nanometer crystal alloy raw material iron, ferro-boron, silicon metal, copper and niobium by set of dispense than Fe: Cu: Nb: Si: B=73.5: 1: 3: 13.5: 9 (at%) vacuum melting, the antivacuum fusing of ingot, the Cast Strip, rolling, iron core winding, heat-treatment of annealing, detect, operations such as packing, it is characterized in that described nanometer crystal alloy ingot antivacuum melting process nanometer crystal alloy novel material and mix using through this material of oxidation, through this material score 〉=20% of oxidation, iron core heat-treatment of annealing operation be provided with incubation period warm and heating and heat preservation after fast-cooling technology.
2. the precision current mutual inductor nano-crystalline alloy iron core manufacture method that is used for according to claim 1, it is characterized in that described heat-treatment of annealing technology, incubation period, preheating temperature was 430 ℃～470 ℃, soaking time 20～60 minutes, after be warmed up to 500 ℃～565 ℃, be incubated 60 minutes.
3. the precision current mutual inductor nano-crystalline alloy iron core manufacture method that is used for according to claim 1 is characterized in that heat-treatment of annealing converges 450 ℃ of skill preheating temperatures incubation period, is incubated 40 minutes, after be warmed up to 540 ℃, be incubated 60 minutes.
4. according to claim 1 or the 2 or 3 described precision current mutual inductor nano crystal iron core, manufacturing methods that are used for, it is characterized in that fast-cooling technology is to push the thermal source stove open in the described heat-treatment of annealing technology, iron core is cold soon in the dawn at stove.
5. one kind is used for precision current mutual inductor nano-crystalline alloy iron core, it is characterized in that nanocrystalline iron core initial permeability μ
0〉=5 ten thousand, magneticsaturation value Bs≤1.0T, iron core have aluminium matter protective case outward, and the iron core protective case is divided into shell block (1), cap (2) two parts, are provided with the circle ring (3) of antimagnetic shield after flap closes up.
6. the precision current mutual inductor nano-crystalline alloy iron core that is used for according to claim 5 is characterized in that iron core protective case material ZL104 cast aluminium.
7. according to claim 5 or the 6 or 7 described precision current mutual inductor nano-crystalline alloy iron cores that are used for, it is characterized in that the precision current mutual inductor is applied on 110KV, the 220KV circuit, measuring accuracy is more than 0.2 grade, instrument security factor Fs≤5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN99124249A CN1088123C (en) | 1999-12-14 | 1999-12-14 | Nm-class crystal alloy-iron core for precise current transformer and its making method |
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|---|---|---|---|
| CN99124249A CN1088123C (en) | 1999-12-14 | 1999-12-14 | Nm-class crystal alloy-iron core for precise current transformer and its making method |
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| CN1257937A true CN1257937A (en) | 2000-06-28 |
| CN1088123C CN1088123C (en) | 2002-07-24 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103060691A (en) * | 2013-01-14 | 2013-04-24 | 青岛云路新能源科技有限公司 | Iron-based nanocrystalline ribbon and preparation method thereof |
| CN103390492A (en) * | 2013-07-31 | 2013-11-13 | 河北申科电子股份有限公司 | Production process of ultra-crystallite cutting iron core for split mutual inductor |
| CN103632823A (en) * | 2013-12-06 | 2014-03-12 | 国家电网公司 | Double-air-gap core electronic current transformer |
| CN108179257A (en) * | 2017-12-28 | 2018-06-19 | 王信凝 | A kind of processing method of Fe-based amorphous alloy |
| CN110246648A (en) * | 2018-03-09 | 2019-09-17 | Tdk株式会社 | Soft magnetic metal powder, compressed-core and magnetic part |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106169362A (en) * | 2016-08-24 | 2016-11-30 | 宁波华众和创工业设计有限公司 | A kind of common mode inductance applying high stability ultracrystalline magnetic core and manufacture method thereof |
| CN106205994A (en) * | 2016-08-24 | 2016-12-07 | 宁波华众和创工业设计有限公司 | The ultracrystalline magnetic core of a kind of high stability and manufacture method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1092201A (en) * | 1994-01-29 | 1994-09-14 | 冶金工业部钢铁研究总院 | The manufacture method of iron-base quick-quenching soft magnetic alloy core |
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1999
- 1999-12-14 CN CN99124249A patent/CN1088123C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103060691A (en) * | 2013-01-14 | 2013-04-24 | 青岛云路新能源科技有限公司 | Iron-based nanocrystalline ribbon and preparation method thereof |
| CN103390492A (en) * | 2013-07-31 | 2013-11-13 | 河北申科电子股份有限公司 | Production process of ultra-crystallite cutting iron core for split mutual inductor |
| CN103390492B (en) * | 2013-07-31 | 2016-08-31 | 河北申科电子股份有限公司 | A kind of production technology of the ultracrystallite cutting iron core of open-close type transformer |
| CN103632823A (en) * | 2013-12-06 | 2014-03-12 | 国家电网公司 | Double-air-gap core electronic current transformer |
| CN108179257A (en) * | 2017-12-28 | 2018-06-19 | 王信凝 | A kind of processing method of Fe-based amorphous alloy |
| CN110246648A (en) * | 2018-03-09 | 2019-09-17 | Tdk株式会社 | Soft magnetic metal powder, compressed-core and magnetic part |
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| CN1088123C (en) | 2002-07-24 |
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