CN106935377B - Inexpensive and strong anti-short circuit capability class Oval core and its auxiliary computational methods - Google Patents
Inexpensive and strong anti-short circuit capability class Oval core and its auxiliary computational methods Download PDFInfo
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- CN106935377B CN106935377B CN201710152111.8A CN201710152111A CN106935377B CN 106935377 B CN106935377 B CN 106935377B CN 201710152111 A CN201710152111 A CN 201710152111A CN 106935377 B CN106935377 B CN 106935377B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
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Abstract
Inexpensive and strong anti-short circuit capability class Oval core of the invention and its auxiliary computational methods belong to transformer technology field；The technical issues of solution is：There is provided a kind of low cost for distribution transformer and anti-short circuit capability it is strong class Oval core and its auxiliary computational methods, good product quality, the market competitiveness it is strong；The technical solution used for：Iron core is that multistage lamination stacks composition successively, the section of every grade of lamination is rectangular, iron core global sections are at multistage step, the multistage external figure in ladder vertex of iron core is class ellipse, class ellipse includes two semi arches being oppositely arranged and two side long arcs being oppositely arranged, respectively with two tangent connections of semi arch, the center of circle of two semi arches is respectively positioned in the vertical centerline of core section two side long arcs；The external graphic designs of iron core of the present invention are class ellipse, have not only met the anti-sudden short circuit requirement of state's net distribution transformer, but also have the advantage in terms of oval iron core section material, also facilitate the making of low pressure mold.
Description
Technical field
Inexpensive and strong anti-short circuit capability class Oval core of the invention and its auxiliary computational methods belong to the skill of transformer
A kind of art field, and in particular to oil immersion-type distribution transformer.
Background technology
National grid requires to be increasingly stringenter for distribution transformer at present, this requirement of moderate resistance sudden short circuit is especially
It is important.And numerous domestic producer generally uses such distribution transformer the long round iron for having huge advantage in terms of saving material at present
The heart (as shown in Figure 1), but on the dynamic stability of transformer, oval iron-core transformer becomes less than round (ellipse) iron core
Depressor (Fig. 2 show standard oval iron core), but round (ellipse) iron-core transformer cost is again higher.So batch
Producing country's net class distribution transformer needs a kind of structure of in summary the two advantage.
Invention content
The present invention overcomes the shortcomings of the prior art, technical problem to be solved to be：It provides a kind of for distribution change
The strong class Oval core of the low cost and anti-short circuit capability of depressor and its auxiliary computational methods, good product quality, the market competitiveness
By force.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：Inexpensive and strong anti-short circuit capability class
Oval core, iron core are that multistage lamination stacks composition successively, and the section of every grade of lamination is rectangular, iron core global sections at
The multistage external figure in ladder vertex of multistage step, the iron core is class ellipse, and the class ellipse includes two opposite
The semi arch of setting and two side long arcs being oppositely arranged, described two side long arcs being oppositely arranged respectively with two semi arch phases
Connection is cut, the center of circle of described two semi arches is respectively positioned in the vertical centerline of core section.
The side long arc of the class ellipse is the iron core that three or more are decomposed by the I and II lamination of oval iron core
Piece is formed.
The level-one lamination of the oval iron core before decomposition outer rim to far from the center of circle outside offset distance.
The auxiliary computational methods of low cost and the strong class Oval core of anti-short circuit capability, by the level-one iron of original oval iron core
I and II lamination is decomposed into n lamination and forms class ellipse iron by lamination outer rim to the outside offset distance HN far from the center of circle
Four sections of camber line phase contacts of the heart, the class Oval core are A, B, C, D, and the short axle of the original oval iron core is NN ', and long axis is
LL ', level-one lamination thickness are O2O3=2QN, two level lamination thickness are AP, wherein O2And O3Respectively level-one lamination upper and lower two
The center of circle of end face, Q are the point on the circumference of level-one lamination upper surface and QN perpendicular to short axle NN ', and P is AC and level-one lamination
The intersection point of upper surface calculates decomposition and is as follows：
The first step, it is ∠ β to define HQ and hand over the angles QN, is obtained according to mathematics trigonometric function
Second step defines one of class Oval core side long arc Corresponding angles be ∠ AO1C=2 ∠ α,
Middle O1For side long arcThe center of circle, can be obtained according to geometric reasoning：
The ∠ of ∠ α=2 β
Then：
∠AO1C=4 ∠ β；
Third walks, and connects AC and is M with NN ' intersection points, then obtains side long arcSagitta HM, chord length AC, according to mathematics triangle
Function acquiresRadius R：
AC=2 (AP+PM)=2 (AP+QN)
It can obtain：
R=(4HM2+AC2)/8HM；
4th step, according to A, B, C, D and radius R paint class Oval core two side long arcsWithAnd obtain class
The dimension of picture of Oval core；
5th step selects n lamination width of class Oval core, and long according to the dimension of picture of class Oval core, side
Arc radius and the lamination width at different levels of selection obtain the thickness h of laminations at different levels.
After 5th step obtains the thickness h of laminations at different levels, reality of the numerical value less than h as laminations at different levels is selected
Thickness.
The present invention has the advantages that compared with prior art：
Conducting wire pair when the external graphic designs of iron core in the present invention are class ellipse, existing circle and oval winding technique
Mold it is docile, apply radial fastening force without additional when coiling, when transformer external short circuit will not be due to the effect of radial load
Keep winding loose and deformation, and have the advantage in terms of oval iron core section material, and since class ellipse is formed by four arcs are tangent, side
Low pressure mold making.
Description of the drawings
The present invention will be further described in detail below in conjunction with the accompanying drawings；
Fig. 1 is the cross section structure schematic diagram of existing oval iron core；
Fig. 2 is the cross section structure schematic diagram of existing standard oval iron core；
Fig. 3 is the cross section structure schematic diagram of class Oval core provided by the invention；
Fig. 4 is that class Oval core provided by the invention auxiliary calculates schematic diagram；
Fig. 5 is that class Oval core provided by the invention calculates decomposition diagram.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments；Based on the embodiments of the present invention, ordinary skill people
The every other embodiment that member is obtained without creative efforts, shall fall within the protection scope of the present invention.
Fig. 3 is the cross section structure schematic diagram of class Oval core provided by the invention, as shown in figure 3, low cost and resistance to shorting
The strong class Oval core of ability, iron core are that multistage lamination stacks composition successively, and the section of every grade of lamination is rectangular, iron core
For global sections at multistage step, the multistage external figure in ladder vertex of the iron core is class ellipse, the class ellipse packet
Include the semi arch that two are oppositely arranged and the side long arc that two are oppositely arranged, described two side long arcs being oppositely arranged are respectively with two
A tangent connection of semi arch, the center of circle of described two semi arches is respectively positioned in the vertical centerline of core section.
The side long arc of the class ellipse is the iron core that three or more are decomposed by the I and II lamination of oval iron core
Piece is formed.
The level-one lamination of the oval iron core before decomposition outer rim to far from the center of circle outside offset distance.
The auxiliary computational methods of low cost and the strong class Oval core of anti-short circuit capability, by the level-one iron of original oval iron core
I and II lamination is decomposed into n lamination and forms class ellipse iron by lamination outer rim to the outside offset distance HN far from the center of circle
Four sections of camber line phase contacts of the heart, the class Oval core are A, B, C, D, and the short axle of the original oval iron core is NN ', and long axis is
LL ', level-one lamination thickness are O2O3=2QN, two level lamination thickness are AP, wherein O2And O3Respectively level-one lamination upper and lower two
The center of circle of end face, Q are the point on the circumference of level-one lamination upper surface and QN perpendicular to short axle NN ', and P is AC and level-one lamination
The intersection point of upper surface calculates decomposition and is as follows：
The first step, it is ∠ β to define HQ and hand over the angles QN, is obtained according to mathematics trigonometric function
Second step defines one of class Oval core side long arc Corresponding angles be ∠ AO1C=2 ∠ α,
Middle O1For side long arcThe center of circle, can be obtained according to geometric reasoning：
The ∠ of ∠ α=2 β
Then：
∠AO1C=4 ∠ β；
Third walks, and connects AC and is M with NN ' intersection points, then obtains side long arcSagitta HM, chord length AC, according to mathematics triangle
Function acquiresRadius R：
AC=2 (AP+PM)=2 (AP+QN)
It can obtain：
R=(4HM2+AC2)/8HM；
4th step, according to A, B, C, D and radius R paint class Oval core two side long arcsWithAnd obtain class
The dimension of picture of Oval core；
5th step selects n lamination width of class Oval core, and long according to the dimension of picture of class Oval core, side
Arc radius and the lamination width at different levels of selection obtain the thickness h of laminations at different levels.
After 5th step obtains the thickness h of laminations at different levels, reality of the numerical value less than h as laminations at different levels is selected
Thickness.
The present invention is on the basis of original oval iron core, and the outside offset distance certain distance of level-one lamination outer rim makes one
Artificial circular arc, in this way, oval iron core becomes class Oval core.After the outside offset distance certain distance of level-one lamination outer rim, with this
Point is that a side long arc is made on the vertex of circular arc and oval original semi arch is tangent.
More preferably to explain the present invention, below in conjunction with the accompanying drawings and specific size, used with S13-400/10/0.4 distribution transformers
Oval iron core (diameter 135mm, main 105mm) for the outside offset distance 6mm of main outer rim, illustrates class Oval core is how to lead to
Difference that the long round iron heart improves and itself and oval iron core and Oval core.Main refers both to level-one iron in the present invention
Lamination.
The piece of existing oval iron core as shown in Figure 1, the original oval iron core of diameter 135mm, main 105mm is wide thick with piece
It see the table below after calculating：
| Serial number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Piece is wide | 135 | 130 | 120 | 110 | 100 | 90 | 80 | 60 | 40 |
| Piece is thick | 105 | 18 | 13 | 8 | 6.5 | 5 | 4 | 6 | 4 |
As shown in figure 3, after the outside offset distance 6mm of main outer rim, oblong is evolved into class ellipse, original oval iron core it is short
Axis and major axis dimension are respectively：135mm, 240mm, after being evolved into class ellipse, short axle and major axis dimension are respectively：147mm、
240mm.Correspondingly, having to adjust lamination to meet the oval this shape of class.Because of original oval core section
It is smaller, therefore consider that the first order of oval iron core and both laminations of the second level are only resolved into the class Oval core first order, the
Two level and the third level these three laminations.It is similar, if to be adopted the structure in slightly larger capacity, for ensure lamination with
Gap will not be excessive between low pressure winding, ensures the filling rate of core section, adaptively by the first order of oval iron core and second
Both laminations of grade resolve into the first order of class Oval core, the second level, the third level, the fourth stage, level V this five kinds of iron cores
Piece, if more capacity takes this class formation, similar change should all be within the scope of the present invention.The present invention
After the outside offset distance certain distance of the main outer rim of oval iron core, how the radius of tangent side long arc determines and how will grow
The first order of the round iron heart and both laminations of the second level resolve into the class Oval core first order, the second level and the third level these three
Lamination needs to make certain auxiliary line on the basis of oval to facilitate calculating, specific derivation computational methods as follows：
As shown in Figure 4, class Oval core can be analyzed to four arcsIt is tangent to form, four
Section circular arc intersects at A, B, C, D, oval outside offset distance HN=6mm, original oval main thickness O at 4 points2O3=2QN=2PM=
It is β that 105mm, HQ, which hand over the angles QN,Corresponding angle is 2 α, according to mathematics trigonometric function, β=6.52 ° ∠, the ∠ of ∠ α=2 β=
13.04 °,Corresponding angle ∠ AO1α=26.08 ° C=2 ∠,Corresponding angle ∠ AO2B=180 ° -2 α=153.92 ° ∠.
To obtainRadius R, it is necessary to first acquireSagitta, chord length, arc length, then obtain radius, such as Fig. 4, O2Q=
135/2=67.5mm, AP=15.23mm, AQ=AP/cos β=15.33mm, HQ=52.84mm, AH=AQ+HQ=
68.17mm.∠ HAM=∠ β, in this way, β=7.74 sagitta HM=AHsin, chord length AC=2 (AP+PM)=135.46.It can obtainRadius R=300.19mm.
In conclusion the size of class Oval core is all it has been determined that can then draw the contour pattern of class Oval core, it is next
Step determines that iron core is at different levels wide and piece is thick again.
Since the short axle and major axis dimension of class Oval core after offset distance are respectively：147mm, 240mm take first order lamination
Width is 145mm, as shown in figure 5, its corresponding thickness isChord length, andSagitta be (147-145)/2=1mm,
Radius isRadius, so can be in the hope ofChord length be 48.96mm, to make piece width is unlikely to be influenced beyond contour line
Mounting coil takes its piece thickness h1For 47mm.And so on, it is 140mm to take second level piece width, and corresponding chord length is 91.41mm,
Similarly, chord length 91mm is taken, then its corresponding thickness is h2=(91-47)/2=22mm.It is 130mm, (147- to take third level piece width
130)/2=8.5>6, illustrate that this A-class picture is wide and has been in original oval circular arc, according to Pythagorean theorem, the wide correspondence of this grade of piece
Piece thickness be 18.2mm, similarly, to keep piece width unlikely to influence mounting coil beyond contour line to take h3=18mm.At this point, class
It is 47+22 × 2=91mm that two-stage lamination, which folds thickness, before Oval core, and original oval iron core main thickness is 105mm, in this way,
Third level piece is wide also to be needed to increase piece thickness to be 105-91=14mm, and the wide corresponding folded thickness of third level piece is just 18+14/2=25mm.
The piece that the piece of follow-up iron core is wide and folded thickness is equal to original oval iron core is wide and folded thickness.
As shown in figure 3, see the table below after the wide calculating with piece thickness of the piece of class Oval core provided by the invention：
| Serial number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Piece is wide | 145 | 140 | 130 | 120 | 110 | 100 | 90 | 80 | 60 | 40 |
| Piece is thick | 23.5 | 22 | 25 | 13 | 8 | 6.5 | 5 | 4 | 6 | 4 |
Correspondingly, mold used in the present invention is also class oval structure, the coil wound up is also class oval structure,
Using the distribution transformer of this core type, the selective examination of short-circuit test and national grid by right authority passes through comprehensively
All kinds of experiments, since it has had both the section material advantage of oval iron core transformer, this structure transformer has been successful.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
To modify to the technical solution recorded in previous embodiment, either which part or all technical features are equal
It replaces；And these modifications or replacements, the model for technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (2)
1. the auxiliary computational methods of low cost and the strong class Oval core of anti-short circuit capability, which is characterized in that by original long round iron
I and II lamination is decomposed into n lamination and is formed by the level-one lamination outer rim of the heart to the outside offset distance HN far from the center of circle
Four sections of camber line phase contacts of class Oval core, the class Oval core are A, B, C, D, and the short axle of the original oval iron core is
NN ', long axis are LL ', and level-one lamination thickness is O2O3=2QN, two level lamination thickness are AP, wherein O2And O3Respectively level-one iron
The center of circle in lamination upper/lower terminal face, Q is the point on the circumference of level-one lamination upper surface and QN is perpendicular to short axle NN ', P AC
With the intersection point of level-one lamination upper surface, calculates decomposition and be as follows：
The first step, it is ∠ β to define HQ and hand over the angles QN, is obtained according to mathematics trigonometric function
Second step defines one of class Oval core side long arcCorresponding angles be ∠ AO1C=2 ∠ α, wherein O1
For side long arcThe center of circle, can be obtained according to geometric reasoning：
The ∠ of ∠ α=2 β
Then：
∠AO1C=4 ∠ β；
Third walks, and connects AC and is M with NN ' intersection points, then obtains side long arcSagitta HM, chord length AC, according to mathematics trigonometric function,
It acquiresRadius R：
AC=2 (AP+PM)=2 (AP+QN)
It can obtain：
R=(4HM2+AC2)/8HM；
4th step, according to A, B, C, D and radius R paint class Oval core two side long arcsWithAnd obtain class ellipse iron
The dimension of picture of the heart；
5th step selects n lamination width of class Oval core, and according to the dimension of picture of class Oval core, side long arc half
Diameter and the lamination width at different levels of selection obtain the thickness h of laminations at different levels.
2. the auxiliary computational methods of low cost according to claim 1 and the strong class Oval core of anti-short circuit capability, special
Sign is：After 5th step obtains the thickness h of laminations at different levels, reality of the numerical value less than h as laminations at different levels is selected
Thickness.
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| CN201710152111.8A CN106935377B (en) | 2017-03-15 | 2017-03-15 | Inexpensive and strong anti-short circuit capability class Oval core and its auxiliary computational methods |
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| CN201710152111.8A CN106935377B (en) | 2017-03-15 | 2017-03-15 | Inexpensive and strong anti-short circuit capability class Oval core and its auxiliary computational methods |
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| CN106935377B true CN106935377B (en) | 2018-09-21 |
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| CN107845491A (en) * | 2017-10-31 | 2018-03-27 | 正泰电气股份有限公司 | A kind of three-phase stereo closed assembly formula transformer core and its design method |
| CN111368375B (en) * | 2020-03-04 | 2023-06-20 | 海南金盘智能科技股份有限公司 | Method and device for determining lamination scheme of core column of transformer |
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| JP4606942B2 (en) * | 2005-05-25 | 2011-01-05 | 株式会社日立産機システム | Winding core manufacturing equipment |
| CN201508750U (en) * | 2009-09-25 | 2010-06-16 | 济南法奥电气有限责任公司 | Transformer iron core |
| CN201600993U (en) * | 2010-01-13 | 2010-10-06 | 惠州市变压器厂 | Transformer iron-core structure |
| CN101834057A (en) * | 2010-05-18 | 2010-09-15 | 苏州金山门变压器有限公司 | Oil-immersed on-load capacitance-adjustable transformer |
| CN102592788A (en) * | 2012-01-05 | 2012-07-18 | 江苏宏安变压器有限公司 | Oblong amorphous alloy iron-core dry-type transformer for imaging on-line vibration monitoring |
| CN202758704U (en) * | 2012-03-06 | 2013-02-27 | 武汉正远铁路电气有限公司 | Dry iron-core smoothing reactor |
| CN203277045U (en) * | 2013-05-31 | 2013-11-06 | 宁波仁栋电气有限公司 | Iron core of distribution transformer |
| CN205595186U (en) * | 2015-12-28 | 2016-09-21 | 沈阳变压器研究院股份有限公司 | Iron core post structure |
| CN206541713U (en) * | 2017-03-15 | 2017-10-03 | 南京大全变压器有限公司 | The oval iron core of the class strong for the low cost and anti-short circuit capability of distribution transformer |
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