CN103415901A - Grading ring for an HVDC transformer winding or an hvdc reactor winding - Google Patents
Grading ring for an HVDC transformer winding or an hvdc reactor winding Download PDFInfo
- Publication number
- CN103415901A CN103415901A CN2011800691127A CN201180069112A CN103415901A CN 103415901 A CN103415901 A CN 103415901A CN 2011800691127 A CN2011800691127 A CN 2011800691127A CN 201180069112 A CN201180069112 A CN 201180069112A CN 103415901 A CN103415901 A CN 103415901A
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- Prior art keywords
- shading ring
- cellulosic material
- ring
- electricalresistivityρ
- resistivity
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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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
-
- 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
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
- H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
Abstract
The invention relates to a grading ring (24) for an HVDC transformer winding or an HVDC reactor winding. Said winding comprises an annular core (28), which has a conductive surface (29) and is surrounded by a layer (30) made of cellulose material. According to the invention, said layer (30) is designed as a composite, wherein the resistivity of said composite is reduced as compared to untreated cellulose material. This has the advantage that a voltage drop is better distributed over the layer (30) of the grading ring when an electric direct current field is applied to the grading ring. Load peaks can thus be reduced, and as a result the grading ring (24) can advantageously have a lower height (h) and/or smaller radii (r) of the corners of the cross-section of the grading ring and/or a thinner layer thickness (s) of the layer (30). The design freedom for creating the grading ring can thus advantageously be increased and the material requirement can be decreased.
Description
Technical field
The present invention relates to a kind of shading ring for high voltage direct current transmission transformer coil or high voltage direct current transmission choking-winding.This shading ring have annular, with the core of conductive surface, this conductive surface generally for example, provides by the conductive layer on insulating material (press board) and in the separation of the electric insulation ground, peripheral position of described core.Remaining core is formed by the press board material in this case.In addition, shading ring has by cellulosic material finish mix layer, and this bed of material especially is comprised of paper and surrounds described core fully.
Background technology
The shading ring that starts described type is for example described by WO2008/026992A1.If the described cross section of the shading ring that observation post is used it is evident that it has the cross section of substantial rectangular, this cross section rounding more or less on all four angles.With opposed four angles of distolateral end of coil to be shielded, has smaller radius.The angle of pointing to away from the distolateral end of coil has larger radius.This is essential because paper roll must design thicklyer in this zone so that this paper roll stand due to this region memory electric field strength load and can electrical breakdown.
The bed of material is generally made by paper roll.Because this paper roll forms basically bed thickness uniformly, so must manufacture in this wise described angle with larger radius and additional bed thickness, make the interlayer for example be made of paper in this zone, be involved in together.Therefore produce certain manufacturing expense, because interlayer was difficult to control before with paper, being wound around.
By US4,521,450 is known, the solid material that can flood, consist of cellulose fibre immerses the oxidant of water-based, for example by ferric trichloride (III) solution, cerous sulfate (IV), in the weakly acidic solution that iron (III) potassium cyanide or phosphomolybdic acid form.Then, the azole compounds of moistening cellulosic material and liquid state or steam-like is at room temperature processed always, until pyrroles's ground relevant with the concentration of oxidant polymerization.By impregnated like this cellulosic material at room temperature dry 24 hours.Oxidant guarantees the polymerization of azole compounds on the one hand, guarantees in addition to increase conductivity.Therefore, it is influenced that the electricalresistivityρ of this impregnated cellulosic material can be subject to the kind of pyrroles's concentration and oxidant.
In addition, for example, if relate in the situation that forms electric field, on the insulating barrier of electric conductor, reduce peak value, known nano-complex also can be as the material of classification electric field.For this reason, by WO2004/038735A1, also can use the material for example formed by polymer.In this material, be dispersed with filler, its particle is nano particle, that is to say the average diameter with maximum 100nm.Press US2007/0199729A1, can also use semi-conducting material for this nano particle, its energy gap is in 0eV in the scope of 5eV.For example, by the nano particle used, formed by ZnO, can regulate the resistance of nano-complex.If when sneaking into nano particle, surpass certain volume share, this share depending on the size of nano particle be 10 to 20% percents by volume, the resistivity of nano-complex obviously reduces, wherein, the conductivity of nano-complex can regulate by this way and can with required Condition Matching.Especially can regulate the order of magnitude 10
12The resistivity of Ω m.Therefore, if reach voltage drop by nano-complex, this voltage drop causes electromotive force to distribute more uniformly and therefore also in the mode be applicable to, makes the electric-force gradient produced.The peak electric field that can reduce to produce thus, thus breakdown strength advantageously improved.
When electric conductor is subject to alternating voltage, there is equally the electric-force gradient effect, this electric-force gradient effect is according to other mechanism certainly.The effect of nano-complex weakening electric field is relevant in this permittivity with nano-complex, and wherein, electric permittivity epsilon is the tolerance that material can see through the ability of electric field.This permittivity, also referred to as dielectric constant, wherein, below should be used concept " permittivity ".People also will pass through electric permittivity epsilon
r=ε/ε
0The material electric permittivity epsilon and the electric field constant ε that mean
0The ratio that (permittivity of vacuum) becomes is called relative permittivity.Relative permittivity is higher, and the effect that the material used is compared vacuum weakening electric field is also just larger.Below only relate to the permittivity of use material.
In addition, WO2006/122736A1 describes a kind of by cellulose fiber peacekeeping nanotube, and preferably the system of carbon nano-tube (following title CNT) composition, wherein, can set the resistivity of 6 to 75 Ω m after converting.This nano-complex for example should be used as resistive heating device, wherein, considers that material designs conductibility from the ability of electric energy energy transform into heat energy.For this reason, need to have carbon nano-tube cellulose fibre is had to enough coverages.
WO2006/131011A1 describes a kind of slot, and this slot can also consist of impregnated paper roll.Material B N is also referred to as the material of dipping.This material also can be used with the form of doping.In addition, should use the concentration that has in the cellulosic material particle lower than percolation threshold, in order to not there will be mutually electrically contacting on particle.Due to this reason, the resistivity of nano-complex is not affected basically.
From known a kind of nano-complex with semiconductor or non-conductor nano particle the application that the application is disclosed constantly, application number is DE102010041630.4, these nanoparticulate dispersed are at cellulosic material, for example in press board, this cellulosic material can be as the material that makes electric-force gradient in transformer.At least a portion that is dispersed in the nano particle in cellulosic material has the foreskin of being made by conducting polymer.For example can make paper using, cardboard or press board as cellulosic material.This cellulosic material has the structure of being made by cellulose fibre, and this structure forms the combination of cellulosic material on the whole at it.For example can use Si, SiC, ZnO, BN, GaN, A1N or C, especially boron nitride nano-tube (below be called BNNT) are as partly leading or the nano particle of the non-property led.Can use the polymer of mentioning in DE102007018540A1 as the polymer conducted electricity.For example polypyrrole, polyaniline, polythiophene, the polyparaphenylene, the derivative of poly-phenylene vinylene (ppv) and described polymer, be called the polymer of conduction.PEDOT is the special example of this polymer, and the commodity of this PEDOT are called Baytron, are produced by Beyer Co., Ltd.PEDOT with its systematic name also referred to as poly-(3,4-rthylene dioxythiophene).
By the application constantly before disclosed application number be the application of DE102010041635.5, also can stipulate, macerate is comprised of polymer, this polymer is by the ionomer (especially PSS) of negative electrical charge and crosslinked the forming of ionomer of positive charge.Can use preferred PEDOT or the PANI ionomer as positive charge.Poly-(3,4-rthylene dioxythiophene) mentioned is called PEDOT.PANI is polyaniline, and PSS is Polystyrene Sulronate.The ionomeric use of negative electrical charge and positive charge can realize advantageously that cellulosic material especially simply manufactures.Ionomer can be easy in water, dissolve and therefore flow to the manufacture process of same cellulosic material based on water.By crosslinked ionomer after manufacturing cellulosic material, the resistivity of cellulosic material descends.In this ionomer polymerization and in cellulosic material, form conductive network, this conductive network is responsible for reducing resistivity.Especially also can use described ionomer, the semiconductor of having mentioned in order to seal or idioelectric nano particle.
Disclosed before the moment by the application, publication number is the application of DE102009033267.7, nano-complex also can be with semi-conductive nano particle dipping, the nano particle of this semiconduction is comprised of BNNT at least partly, and is dispersed in cellulose or polymer.The effective conductibility that is dispersed in the BNNT in insulating material for improving at least a portion stipulates, the dopant material that doping is applicable to BNNT or on BNNT with the coated semiconductor of metal or doping.The concentration of BNNT can be chosen as, and making nano-complex have the order of magnitude is 10
12The electricalresistivityρ of Ω m.By this modification, can not use the foreskin of conductive polymer as BNNT.
The method that realizes doping is, the following modification of dopant material that BNNT is applicable to by interpolation, make the dopant material atom form electronic state, this electronic state make BNNT form the p conductor (that is, formation is by the electronic state of valence-band edge trapped electrons) or form n conductor (that is, reach due to thermal excitation by the electronic state of conduction band limit electron emission).Consider that for example Be is as the dopant material for the p doping, Si is as the dopant material for the n doping.The doping of this BNNT can be carried out in position, wherein, for example by gas phase or liquid phase, forms the dopant material atom when BNNT grows.Also feasiblely be, doping can be carried out in other steps after the BNNT growth, and wherein, dopant material generally adds under the impact of heat treatment BNNT.By dopant material is added to BNNT, can be the representative value between 0.1 to 1000 Ω cm for the semiconductor of doping by resistivity decreased.
, application number disclosed constantly by the application is the application of DE102009033268.5, can also be with semi-conductive nano particle dipping by the nano-complex that cellulosic material is made, wherein, also in order to improve at least a portion, be dispersed in effective conductibility of the nano particle in insulating material, regulation is to more nano-particle doped dopant materials.Use the advantage of nano particle, the especially BNNT of semiconduction to be, in the medium and small compactedness of insulating material, the highest 5% percent by volume, preferably even the highest 2% percent by volume is enough to cause the diafiltration of nanoparticle also therefore to improve the conductivity of nano-complex.
Summary of the invention
Consider the WO2008/026992A1 that beginning is mentioned, technical problem of the present invention is, further improves a kind of shading ring that starts described type, makes the fail safe of having simplified its manufacture and/or having improved relatively electrical breakdown on by cellulosic material finish mix layer.
This technical problem solves thus by the present invention, and the described bed of material is designed to the compound be comprised of processed cellulosic material, has the electricalresistivityρ who compares untreated cellulosic material
pThe particle of less resistivity is dispersed in described processed cellulosic material with the concentration higher than percolation threshold.As a supplement or alternatively by the present invention, can stipulate, in processed cellulosic material, to have the electricalresistivityρ who compares untreated cellulosic material
pThe network interconnected of the conducting polymer of less resistance passes compound.Processed cellulosic material can obtain in the mode mentioned of beginning, and or is fabricated to the toroidal cores that makes shading ring and embeds formed body wherein.Perhaps, paper is fabricated to processed cellulosic material, then is wound around in known manner therewith core, thereby obtains by cellulosic material finish mix layer by this winding.
The high voltage direct current transmission component understand is this assembly, and this assembly is used for the transmission of high-voltage direct current electricity and comprises the element of drainage.Especially at this, need transformer or choke valve as the high voltage direct current transmission assembly.Certainly, connecton layout also needs the electrical connection for different high voltage direct current transmission assemblies.Other high voltage direct current transmission assembly is the burble point in these connecton layouts or the insulating sleeve that passes the housing parts that other high voltage direct current transmission assembly is housed.Except high voltage direct current to be guided, alternating current also for example appears in transformer and choking-winding.By high voltage direct current transmission assembly of the present invention, should be suitable for transmitting the high voltage direct current of 100kV at least, preferably be suitable for transmitting the high voltage direct current more than 500kV.
The advantage by design of the present invention of processed cellulosic material is, the electricalresistivityρ of the compound formed like this
CompCompare the electricalresistivityρ of untreated cellulosic material
pReduce.Can realize thus the electricalresistivityρ of compound
CompApproach or, as following further elaboration, even surpass oily electricalresistivityρ
o.Realized thus applying in the direct voltage situation at the insulating segment for high-voltage dc transmission electric coil (high voltage direct current transmission transformer coil or high voltage direct current transmission choking-winding) to forming together by shading ring, voltage drop is distributed on the assembly and transformer oil of being made by cellulosic material better.Be that transformer oil can be stood higher voltage drop on the one hand, and can not cause electrical breakdown.On the other hand, the load that alleviates cellulosic material causes, and the fail safe herein relatively punctured improves, or the bed of material of paper roll or other manufacture on shading ring can design thinlyyer.Especially can in the zone of the special application of load of the rounding back to the coil end face of cross section (especially inner rounding), advantageously greatly reduce load, in order to can save by other insulating material (especially cellulosic material) pad below.This causes, and can advantageously greatly simplify the manufacture of shading ring, improves simultaneously the fail safe of anti-electrical breakdown, or makes it to remain at least the level of a requirement.At this advantageously, at least the electricalresistivityρ of the lip-deep described compound of shading ring
CompBe up to 5 * 10
13Ω m.
Electricalresistivityρ at compound
CompBe up to 5 * 10
13During Ω m, also occur in to a greater degree on transformer oil by voltage drop, can advantageously utilize well described, for the important effect of removing cellulosic material load of the present invention.In order to utilize this effect, people also can advantageously regulate the electricalresistivityρ of compound
Comp, this resistivity is the electricalresistivityρ of transformer oil
o1 to 20 times.Particularly advantageously can stipulate the electricalresistivityρ of compound
CompThe resistivity that is equivalent to transformer oil by the order of magnitude.By the order of magnitude meaning, be the electricalresistivityρ of compound
CompThe highest and resistivity transformer oil differ an order of magnitude (that is to say the highest differ 10 times).
The electricalresistivityρ
o, ρ
pAnd ρ
CompGround relevant with the present invention, should be respectively in room temperature with existingly measure under with reference to field intensity 1kV/mm.Under this condition, the electricalresistivityρ
o10
12To 10
13Between Ω m.But be noted that the electricalresistivityρ of transformer oil
oUnder by stronger load provided by the invention, reduce or rather by the voltage descended on transformer oil.Therefore, in the embodiment also further described below, the electricalresistivityρ in transformer oil
oFrom 10
12Ω m rises.
The electricalresistivityρ who selects the lip-deep compound of shading ring
CompThe time importantly, not obvious electricalresistivityρ lower than transformer oil in this zone
o.Thus, as describing, the electric loading of transformer oil and cellulosic material can equate.Certainly also advantageously can make the resistivity of the cellulosic material of shading ring further reduce (even to be reduced to lower than ρ along with the increase at the interval with the shading ring surface
oValue), therefore in this zone, can realize that electric field distributes targetedly.This advantageously helps to reduce the electric loading in the zone of top already described, rounding cross section with special degree.
In order to realize the electricalresistivityρ
CompBe evenly distributed on the bed thickness of shading ring, advantageously can make resistivity classification adjacent, that form the layering of the bed of material, wherein, have or some layerings and core adjacency of minimum specific resistance.These layerings for example can produce by the coiling of the paper from different dippings.Then, on this core, at first apply and have minimum specific resistance ρ
CompLayering, then apply at least one and have more high resistivity ρ
CompLayering, wherein, the last one deck that forms distolateral ring surface advantageously is equivalent to the resistivity of transformer oil at least by the order of magnitude.Each of bed thickness has same resistivity ρ
CompZone be interpreted as respectively by layering of the present invention.This also means, this layering can form by a plurality of ply of papers.At this many like this ply of paper (winding layer) of reeling, make the thickness that reaches the layering expectation.
Another kind sets different resistivity ρ to shading ring
CompThe possibility in zone be, this shading ring consists of a plurality of with one heart inside and outside nested single rings, wherein, the inner single resistivity that is equipped with is than outside single ring or a plurality of follow-up less cellulosic material of single ring.Certainly particularly advantageously use only two single rings.By the present invention, even single ring does not structurally interconnect, single ring also forms shading ring jointly.Therefore, that is to say that whole parts all are interpreted as by shading ring of the present invention, these parts are arranged in the distolateral stub area of coil and have typical shading ring structure.
Advantageously, inner loop is provided with the resistivity less than external rings.The electric loading of the corner back to the distolateral end of coil that described, the shading ring cross section ratio on the inboard of coil is higher on the outside.This can consider when the cellulosic material on shading ring is used in design.Can advantageously for outside single ring, regulate and have more small concentration, dipping cellulosic material thus, especially can save material cost thus.In addition, advantageously generate larger gap, in order to make electric-force gradient in the mode of expectation.
The special organization plan regulation of the present invention, be designed to basically equate around the thickness of whole cross section perpendicular to the ring trend by cellulosic material finish mix layer.This design realizes as described above like this, makes by the resistivity of cellulosic material of the present invention and the demand of electric-force gradient and mates in this wise, makes electric loading be distributed in better on the regional of shading ring and transformer oil on every side.The cellulosic material of the thickness that is designed to basically equate is interpreted as that shading ring is only by the layer of paper tape around the coiling generation of core.At this, be that the layer of having reeled is slightly thicker than encircling on the outside on the ring inboard, slightly more severe because the adjacent coiling loops of paper as used herein intersects naturally.Certainly, consider the diameter of core to be wound, the layer of basically having reeled is considered as having the structure of substantially the same thickness.
When by cellulosic material finish mix layer, being designed to directly be bearing on core around whole cross section perpendicular to the ring trend, obtain another organization plan of the present invention.This means, save interlayer additional, that need additional fabrication cost.Therefore, manufacturing expense can advantageously reduce by the saving that adds interlayer.Not only reduced thus manufacturing expense, but also realized higher process safety, because can save the interlayer that for example can skid when reeling.
By use, press cellulosic material of the present invention, advantageously also feasible is that the height h of shading ring compares required height while replacing compound to use relevant untreated cellulosic material and reduces.Another kind of possibility advantageously is, the thickness s of the bed of material compares needed thickness when replacing compound to use relevant untreated cellulosic material and reduces.In addition, can also stipulate, shading ring advantageously has, rectangular cross section that have rounding trend perpendicular to ring, and wherein, the radius r of this rounding is compared required radius when replacing compound to use relevant untreated cellulosic material and reduced.These structural design features can advantageously change according to the structural design gaps of having set forth, and wherein, can consider the boundary condition of the geometry of use occasion at this.For example feasiblely be, by insulating segment is provided, in the high-voltage dc transmission piezoelectric transformer, reduce the height h of shading ring, if this insulating segment is not used by cellulosic material of the present invention, operating voltage at the high voltage direct current transmission assembly is more and more higher, partly surpasses in the situation of 1000kV and will extremely take up room.On the other hand, predesignate the full-size on the high voltage direct current transmission modular construction, in order to for example can also realize by railway transportation.At this, the shading ring with size of the geometry reduced can help reducing of structure space.Certainly reducing structure space, namely during the thickness s of the height h of shading ring or the bed of material, considering to prevent that the fail safe of electrical breakdown still is equivalent to value given in advance at least on the whole.
The main advantage that reduces of the radius r of the cross section rounding corner of shading ring is that this shading ring can bear larger mechanical load, so that all parts of high voltage direct current transmission assembly keeps together.By the interlayer that saves core and be somebody's turn to do between layer on every side, also can obtain the result that reduces this radius simultaneously, the structure space therefore needed by this interlayer passes through the material filling of core.
The accompanying drawing explanation
Following other details of the present invention are described with reference to the accompanying drawings.Identical or corresponding figure elements indicates respectively and therefore only repeatedly sets forth the difference before each accompanying drawing with identical Reference numeral.In accompanying drawing:
Fig. 1 is the cross section by the embodiment of shading ring of the present invention, and its surface and the transformer oil of adjacency and other solid shielding parts of being made by press board with it wherein only are shown,
Fig. 2 be by the simple profile of an embodiment of the shading ring in the high-voltage dc transmission piezoelectric transformer of packing into of the present invention and
Fig. 3 is a cross section that embodiment is simple by shading ring of the present invention, wherein, and the structural design gaps that diagram is determined.
Embodiment
When alternating voltage effect lower time, the electric insulation of transformer must prevent electrical breakdown under working condition.In this case, the insulation characterisitic of insulating barrier is relevant with the permittivity of the component of insulating barrier.For oil, electric permittivity epsilon
oBe about 2, and the electric permittivity epsilon of cellulosic material
pBe 4.Therefore, when to insulating material, adding alternating voltage, for the load of each insulation assembly, the voltage U on oil
oIt is approximately the voltage U on cellulosic material
pTwice.If the use nano-complex, wherein, cellulosic material 19 is by the present invention's dipping, and macerate 11 does not affect at the voltage by insulating material of the present invention and distributes, because electric permittivity epsilon
BNNTBe about equally 4 and the therefore electric permittivity epsilon of impregnated cellulosic material
CompAlso be about 4.Therefore, even when by the present invention, insulating, act on the voltage U on oil
oAlso be about the voltage U acted on nano-complex (cellulosic material)
CompTwice.
Simultaneously, under the direct voltage effect, in the high voltage direct current transmission assembly, the breakdown strength of insulating material is important.Therefore, the voltage certainly existed on each insulating component distributes no longer relevant with permittivity, and relevant with the resistivity of each assembly.The electricalresistivityρ of oil
o10
13To 10
12Between Ω m.Should consider, carry out the voltage drop of greater part so that alleviating load and the oily resistivity of the cellulosic material in oil reduces when having voltage by the present invention, or rather, as shown in Figure 1, the electricalresistivityρ
oFrom 10
12Ω m rises.Correspondingly, the ρ of cellulosic material
pExceed three orders of magnitude and be 10
15Ω m.This causes, and is the voltage U on cellulosic material at the voltage U o on oil under the direct voltage effect
pOne thousandth (the hypothesis ρ
o=10
13During Ω m, be at least one of percentage to one of five percentages).The danger that this imbalance is hidden is, in when to insulating material, applying direct voltage, causing cellulosic material puncture and electric insulation malfunctioning.
The macerate 11 of introducing cellulosic material 19 by the present invention for example can by BNNT form and by the BNNT bed of material formed by PEDOT:PSS that is applicable to and may the time by the dopant material that additionally doping has its resistivity (between 0.1 and 1000 Ω m) to BNNT, regulate in this wise, make cellulosic material ρ
pResistivity decreased.This also realizes by unique use PEDOT:PSS or unique use BNNT.Therefore, can regulate the electricalresistivityρ by compound of the present invention
Comp, this electricalresistivityρ
CompNear the electricalresistivityρ
oAnd approximate in the ideal case this electricalresistivityρ
o.Work as the electricalresistivityρ
CompBe up to 5 * 10
13During Ω m, act on the voltage U on oil
oBy the order of magnitude in the voltage U be formed on compound
CompScope in, in order to regulate the voltage of the compensation in insulating material, distribute.Advantageously improve thus the breakdown strength of insulating material, because the load of cellulosic material obviously reduces.
The cross section of visible high-voltage dc transmission piezoelectric transformer in Fig. 2, this high-voltage dc transmission piezoelectric transformer is arranged in the housing also referred to as oil tank of transformer 21.In addition, show high-tension coil and low-voltage coil, their winding 22,23 is visible in Fig. 2.For sight line is clear, transformer core 14 only simply illustrates.
For winding 22, by field wire 33, electric field is shown, this field wire extends on the equipotential surface of electric field.This electric field is subject to the impact of the different elements of seal, and these elements also have graded insulation ring 24,25 as element, the cylindrical solid shielding part 26 consisted of press board and the dihedral ring 27 consisted of press board equally. Shading ring 24,25 has with the core 28 of metal surface 29 and paper roll 30.In addition, inner space 31 is filled with transformer oil, so transformer oil also flows in the gap 32 between each element of seal and fills up this gap 32.In addition, electric field line 33 also passes the thrust ring 34 of being made by blook board (Blockspan).Therefore, press decline of the present invention by the resistivity of cellulosic material, also can change thrust ring 34, so that the electric field that impact forms in this zone.Thrust ring 34 jointly guarantees together that with winding platform unshowned, made and supported equally winding 22,23 by blook board all parts mechanically are bonded together (comprising the solid shielding part).Within the scope of the invention, thrust ring 34 and unshowned winding platform also can be understood as the element of insulating segment.
Visible in Fig. 3, by single ring 35 and the outside single ring 36 of shading ring 24 of the present invention by inside, form.Shading ring 24 has the thickness s of height h and the bed of material 30, as shown in the figure.In addition, the rounding back to unshowned coil of cross section shown in figure is provided with radius r.In Fig. 3, the signal of the outline line that is represented by dotted lines equally, the geometry of shading ring that does not set the cellulosic material of dipping relatively seems possible outward appearance qualitatively.This shading ring has larger height h
0And/or the thickness S of the larger bed of material 30
0And/or on above-mentioned angle larger radius r
0, wherein, higher radius r
0Only by core 28, describe, be formed in this zone for use in the space of the additional interlayer of being made by cellulose not shown further.It can be arranged on by radius r and r
oIn the space formed.
Visible in addition, the layer of inner single ring 35 is comprised of layering 37,38.The bed of material 30 that forms the layering 37 on surface of shading ring 24 and outside single ring 36 has by the order of magnitude and is equivalent to the resistivity of transformer oil on every side.By comparison, with the resistivity of the layering 38 of core 28 adjacency, further reduce, so that this resistivity is lower than the resistivity of transformer oil.Alleviated thus the voltage drop of shading ring 24 by the high voltage direct current transmission direct voltage load in the zone of application of load the most doughtily.This zone is positioned at regard to the ring with regard to the shading ring trend of cross section of shading ring on the inner corners of coil.For other zones of the single ring in inside, reducing of the resistivity of the layering 38 of close core is own unnecessary.But this is also harmless, therefore for the reason of manufacturing technology, inner single ring 38 is wound around fully with together with the layering 38 of core.Certainly, for outside monocycle 36, for the reason of cost, stop together with the material of transformer oil, adding winding with resistivity.Resistivity is reduced to the value of transformer oil by the order of magnitude with regard to it is enough herein.
Claims (12)
1. shading ring for high voltage direct current transmission transformer coil or high voltage direct current transmission choking-winding, this shading ring has
With the toroidal cores (28) of conductive surface (29),
By the bed of material (30) that cellulosic material (19), especially paper are made, the described core of the described bed of material (30) comprehensive surrounding (28),
It is characterized in that, the described bed of material (30) is designed to the compound consisted of processed cellulosic material,
In described cellulosic material, has the electricalresistivityρ who compares described untreated cellulosic material
pThe particle of less resistivity (11) disperses with the concentration higher than percolation threshold, and/or
In cellulosic material, has the electricalresistivityρ who compares untreated cellulosic material
pThe network interconnected of the conducting polymer of less resistance passes compound.
2. press shading ring claimed in claim 1,
It is characterized in that,
At least the electricalresistivityρ of described lip-deep described compound
CompBe up to 5 * 10
13Ω m.
3. press shading ring claimed in claim 2,
It is characterized in that,
At least the electricalresistivityρ of described lip-deep described compound
CompFor 1 to 20 times of the resistivity of transformer oil.
4. by shading ring claimed in claim 2, it is characterized in that,
At least the electricalresistivityρ of the lip-deep described compound of described shading ring
CompThe electricalresistivityρ who is equivalent to transformer oil by the order of magnitude
o.
5. by one of aforementioned claim described shading ring, it is characterized in that,
Adjacent each forms the resistivity classification of the layering (37,38) of the described bed of material (30), and wherein, one or some have layering and the described core adjacency of minimum specific resistance.
6. by one of aforementioned claim described shading ring, it is characterized in that,
Described shading ring consists of a plurality of with one heart inside and outside nested single rings (35,36), and wherein, inner most described single ring (35) sets the cellulosic material had than or the less resistivity of the single rings in some described outsides (36).
7. by one of aforementioned claim described shading ring, it is characterized in that,
By described cellulosic material finish mix layer (30), be designed to basically equate around the thickness of whole cross section perpendicular to the ring trend.
8. by one of aforementioned claim described shading ring, it is characterized in that,
The described bed of material (30) of being made by cellulosic material directly is bearing on described core around whole cross section perpendicular to the ring trend.
9. by one of aforementioned claim described shading ring, it is characterized in that, the described bed of material is comprised of the paper roll with a plurality of volume layers, and wherein, described paper roll is reeled around the cross section perpendicular to the ring trend.
10. by one of aforementioned claim described shading ring, it is characterized in that,
The height h of described shading ring compares required height while replacing described compound to use relevant untreated cellulosic material and reduces.
11. by one of aforementioned claim described shading ring, it is characterized in that,
The thickness s of the described bed of material (30) compares needed thickness when replacing described compound to use relevant untreated cellulosic material and reduces.
12. by one of aforementioned claim described shading ring, it is characterized in that,
Described shading ring have perpendicular to the rectangular cross section with the rounding corner of ring trend and
The radius r of described rounding corner is compared needed radius when replacing described compound to use relevant untreated cellulosic material and is reduced.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011008462.2 | 2011-01-07 | ||
| DE102011008462A DE102011008462A1 (en) | 2011-01-07 | 2011-01-07 | Shield ring for a HVDC transformer coil or HVDC choke coil |
| PCT/EP2011/074082 WO2012093052A1 (en) | 2011-01-07 | 2011-12-27 | Grading ring for an hvdc transformer winding or an hvdc reactor winding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103415901A true CN103415901A (en) | 2013-11-27 |
| CN103415901B CN103415901B (en) | 2017-05-17 |
Family
ID=45476495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180069112.7A Expired - Fee Related CN103415901B (en) | 2011-01-07 | 2011-12-27 | Grading ring for an HVDC transformer winding or an hvdc reactor winding |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2661760B1 (en) |
| CN (1) | CN103415901B (en) |
| BR (1) | BR112013017401B1 (en) |
| DE (1) | DE102011008462A1 (en) |
| WO (1) | WO2012093052A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013205585A1 (en) * | 2013-03-28 | 2014-10-16 | Siemens Aktiengesellschaft | Cellulosic material with impregnation and use of this cellulosic material |
| DE102016205195A1 (en) | 2016-02-02 | 2017-08-17 | Siemens Aktiengesellschaft | Shield ring for a transformer coil |
| AT518664B1 (en) | 2016-04-22 | 2017-12-15 | Trench Austria Gmbh | HVDC air choke coil and method of manufacture |
| DE102017207009A1 (en) | 2017-04-26 | 2018-10-31 | Siemens Aktiengesellschaft | Shield ring for a transformer coil |
| DE102017208950A1 (en) | 2017-05-29 | 2018-11-29 | Siemens Aktiengesellschaft | Shield ring and / or pitch compensation for a transformer coil |
| DE102017212026A1 (en) | 2017-05-29 | 2018-11-29 | Siemens Aktiengesellschaft | Shield ring and / or pitch compensation for a transformer coil |
| EP3410451B1 (en) | 2017-05-29 | 2021-11-17 | Siemens Energy Global GmbH & Co. KG | Shield ring for a transformer coil |
| CN110737998B (en) * | 2019-09-25 | 2022-07-26 | 中国电力科学研究院有限公司 | Grading ring optimization design method based on finite element and deep belief network |
| CN112528534A (en) * | 2020-11-19 | 2021-03-19 | 南方电网科学研究院有限责任公司 | Method, system and device for acquiring surface maximum electric field intensity of direct current voltage divider |
| EP4160631A1 (en) * | 2021-04-26 | 2023-04-05 | Delta Electronics, Inc. | Planar winding structure for power transformer |
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| EP0285895B1 (en) * | 1987-04-09 | 1992-03-11 | Siemens Aktiengesellschaft | High voltage isolation device for transformers and inductances, especially destinated to high voltage direct current transmission |
| CN101136281A (en) * | 2006-08-28 | 2008-03-05 | Abb技术有限公司 | High voltage transformer with a shield ring, a shield ring and a method of manufacture same |
| US7943066B2 (en) * | 2006-10-06 | 2011-05-17 | The University Of New Brunswick | Electrically conductive paper composite |
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| DE2062157A1 (en) * | 1970-12-17 | 1972-06-29 | Transformatoren Union Ag | High-voltage insulation arrangement for oil-filled electrical devices, in particular for direct voltage transmission |
| JPS60165707A (en) * | 1984-02-08 | 1985-08-28 | Toshiba Corp | Transformer for ac-dc conversion |
| SE463951B (en) * | 1989-06-19 | 1991-02-11 | Asea Brown Boveri | CONTROL BODY CONTAINS FAULT CONTROL OF A TRANSFORMER TRANSMISSION CONNECTOR TO A TRANSFORMER WIRING CONNECTOR WITH STRUCTURAL TRANSFORMERS |
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- 2011-01-07 DE DE102011008462A patent/DE102011008462A1/en not_active Ceased
- 2011-12-27 CN CN201180069112.7A patent/CN103415901B/en not_active Expired - Fee Related
- 2011-12-27 BR BR112013017401-3A patent/BR112013017401B1/en not_active IP Right Cessation
- 2011-12-27 EP EP11807943.3A patent/EP2661760B1/en not_active Not-in-force
- 2011-12-27 WO PCT/EP2011/074082 patent/WO2012093052A1/en active Application Filing
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| US4521450A (en) * | 1982-06-22 | 1985-06-04 | Asea Aktiebolag | Method of increasing the electrical conductivity of cellulose-based materials or other impregnable materials |
| EP0285895B1 (en) * | 1987-04-09 | 1992-03-11 | Siemens Aktiengesellschaft | High voltage isolation device for transformers and inductances, especially destinated to high voltage direct current transmission |
| CN101136281A (en) * | 2006-08-28 | 2008-03-05 | Abb技术有限公司 | High voltage transformer with a shield ring, a shield ring and a method of manufacture same |
| US7943066B2 (en) * | 2006-10-06 | 2011-05-17 | The University Of New Brunswick | Electrically conductive paper composite |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2661760A1 (en) | 2013-11-13 |
| EP2661760B1 (en) | 2018-07-11 |
| DE102011008462A1 (en) | 2012-07-12 |
| BR112013017401A2 (en) | 2016-10-04 |
| CN103415901B (en) | 2017-05-17 |
| WO2012093052A1 (en) | 2012-07-12 |
| BR112013017401B1 (en) | 2020-09-29 |
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