CN103415901B - 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
- CN103415901B CN103415901B CN201180069112.7A CN201180069112A CN103415901B CN 103415901 B CN103415901 B CN 103415901B CN 201180069112 A CN201180069112 A CN 201180069112A CN 103415901 B CN103415901 B CN 103415901B
- Authority
- CN
- China
- Prior art keywords
- cellulosic material
- ring
- shading ring
- resistivity
- complex
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
-
- 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 shielding for D.C. high voltage transmission transformer coil or D.C. high voltage transmission choking-winding
Ring.The shading ring has annular, the core with conductive surface, and the conductive surface is typically by insulant（For example squeeze
Cardboard）On conductive layer provide and at the peripheral part of the core electric insulation separate.Remaining core is in this case
Formed by press board material.Additionally, shading ring has the bed of material by made by cellulosic material, the bed of material is especially made up of simultaneously paper
And surround the core completely.
Background technology
The shading ring for starting the type is for example described by WO2008/026992A1.If the used shading ring of observation
The cross section, then it is readily apparent that it has the cross section of substantial rectangular, the cross section is on all four angle or more
Or few rounding.Four angles opposed with the end side tip of coil to be shielded have smaller radius.Away from the side of coil
The angle that end is pointed to has bigger radius.This is required, because paper roll must be designed to be thicker in the region, so as to this
Paper roll stands the load of the electric field intensity due to existing in the region without electrical breakdown.
The bed of material is typically made by paper roll.Because this paper roll forms substantially uniform thickness, must be in this wise
The described angle with larger radius and additional thickness of manufacture so that the interlayer being for example made of paper is involute in the region together
Enter.Therefore certain manufacturing expense is produced, because interlayer was difficult to control to before winding with paper.
By US4,521,450 by solid material can impregnating, being made up of cellulose fibre, it is known that immerse the oxidation of aqueouss
Agent, such as by ferric chloride (III) solution, cerous sulfate (IV), the weakly acidic solution that ferrum (III) potassium cyanide or phosphomolybdic acid are constituted
In.Then, the cellulosic material of moistening is processed always at room temperature with the azole compounds of liquid or steam-like, until pyrroles with
The concentration of oxidant is polymerized relevantly till.So impregnated cellulosic material is dried at room temperature for into 24 hours.Oxidant
On the one hand the polymerization of azole compounds is ensured, it will also ensure that increase electric conductivity.Therefore, this impregnated cellulosic material
Electricalresistivityρ can be subject to the species of the concentration of pyrroles and oxidant impacted.
If additionally, reducing peak value in the case of being related to form electric field, for example on the insulating barrier of electric conductor, it is known that nanometer
Complex is also used as being classified the material of electric field.For this purpose, press WO2004/038735A1 can also use for example by polymer group
Into material.Filler is dispersed with this material, its granule is nano-particle, that is to say, that with the average of maximum 100nm
Diameter.By US2007/0199729A1, for this nano-particle can also use semi-conducting material, its energy gap to be in
In the range of 0eV to 5eV.The electricity of nano-complex can be adjusted by used, nano-particle being for example made up of ZnO
Resistance.If when nano-particle is mixed into more than certain volume share, the share depending on the size of nano-particle as 10 to 20%
Percent by volume, then the resistivity of nano-complex be obviously reduced, wherein, the electric conductivity of nano-complex can be by this way
Adjust and can be with required condition coupling.The order of magnitude 10 can especially be adjusted12The resistivity of Ω m.Therefore, if multiple by nanometer
Compound reaches voltage drop, and the voltage drop causes potential distribution evenly and therefore also makes produced electric field in a suitable manner
Gradient distribution.It is possible thereby to reduce produced peak electric field, so as to beneficially improve breakdown strength.
When electric conductor is subject to alternating voltage, equally exist electric-force gradient effect, certainly the electric-force gradient effect according to
According to other mechanism.The effect here that nano-complex weakens electric field is relevant with the dielectric constant of nano-complex, wherein, dielectric constant
ε is a tolerance of the ability that material can pass through electric field.The dielectric constant is also referred to as dielectric constant, wherein, concept should be used below
" dielectric constant ".People also will be by electric permittivity epsilonr=ε/ε0The material permittivities ε and Electric field constant ε of expression0(permittivity of vacuum) institute
Into ratio be referred to as relative permitivity.Relative permitivity is higher, and the material for being used compares the effect of vacuum weakening electric field also
It is bigger.Only relate to below using material dielectric constant.
Additionally, WO2006/122736A1 description one kind is by cellulose fiber peacekeeping nanotube, preferred CNT is (referred to below as
CNT) the system of composition, wherein it is possible to set the resistivity of 6 to 75 Ω m after conversion.The nano-complex should for example be used as electricity
Resistance heater, wherein, it is considered to material is converted into the ability of heat energy to design conductivity from electric energy.For this reason, it may be necessary to receive with carbon
Mitron has enough coverages to cellulose fibre.
WO2006/131011A1 describes a kind of slot, and the slot can be being made up of impregnated paper roll.Material BN is also referred to as
The material that work impregnates.The material can also be used in the form of adulterating.Additionally, should be dense in cellulosic material using having
Degree less than percolation threshold granule, to be not in the mutual electrical contact on granule.Due to this reason, the electricity of nano-complex
Resistance rate is substantially not affected.
It is known a kind of with half in disclosed, Application No. DE102010041630.4 application from after the application moment
The nano-complex of conductor or non-conductor nano-particle, these nano-particle are dispersed in cellulosic material, such as in press board,
The cellulosic material can serve as making the material of electric-force gradient in transformator.The nano-particle being dispersed in cellulosic material
At least a portion have by made by conducting polymer foreskin.Paper, cardboard or press board can for example be used as fiber
Cellulosic material.The cellulosic material has the structure by made by cellulose fibre, and the structure constitutes on the whole cellulosic material at it
Combination.Si, SiC, ZnO, BN, GaN, A1N or C, especially boron nitride nano-tube (hereinafter referred to as BNNT) can for example be used
As partly lead or the non-property led nano-particle.The polymer referred in DE102007018540A1 can be used as conduction
Polymer.The derivant of such as polypyrrole, polyaniline, polythiophene, polyparaphenylene, poly-phenylene vinylene (ppv) and the polymer, claims
Make conductive polymer.PEDOT is the special example of this polymer, and the trade name Baytron of the PEDOT is public by Bayer
Department's production.PEDOT is with its systematic name also referred to as poly- (3,4-rthylene dioxythiophene).
By the application of disclosed Application No. DE102010041635.5 before the application moment, it is also possible to specify, dipping
Thing is made up of polymer, the polymer by negative charge ionomer（Especially PSS）Form with the ionomer crosslinking of positive charge.Can
Using using preferred PEDOT or PANI as positive charge ionomer.Poly- (3,4-rthylene dioxythiophene) noted above is referred to as
PEDOT.PANI is polyaniline, and PSS is polystyrene Sulfonate.The use of the ionomer of negative charge and positive charge can be advantageously carried out
The particularly simple manufacture of cellulosic material.Ionomer can be easy in water dissolving and therefore be conveyed to the fiber for being equally based on water
The manufacture process of cellulosic material.By the crosslinked ionomers after manufacture cellulosic material, the resistivity of cellulosic material declines.
This ionomer is polymerized and conductive network is formed in cellulosic material, and the conductive network is responsible for reducing resistivity.Especially also may be used
With using described ionomer, to encapsulate quasiconductor or idioelectric nano-particle noted above.
By disclosed, Publication No. DE102009033267.7 application, nano-complex before the moment of the application
Can be impregnated with the nano-particle of quasiconductor, the nano-particle of the semiconduction is at least partly made up of BNNT, and is dispersed in fibre
In dimension element or polymer.Specify to improve the being effectively conducted property of the BNNT that at least a portion is dispersed in insulant, give
The suitable dopant material of BNNT doping or on BNNT with metal or the coated semiconductor of doping.The concentration of BNNT can be selected
For so that it is 10 that nano-complex has the order of magnitude12The electricalresistivityρ of Ω m.By the modification, conductive polymerization can not be used
Foreskin of the thing as BNNT.
Realizing the method for doping is, BNNT is modified as follows by the suitable dopant material of addition so that dopant atom
Form electronic state, the electronic state makes BNNT form p conductors (that is, form the electronic state that electronics is captured by valence-band edge) and or forms n
Conductor (that is, reach the electronic state by conduction band edge emitting electronics due to thermal excitation).Consider such as Be as p doping
Dopant material, Si is used as the dopant material for n doping.The doping of this BNNT can be carried out in the original location, wherein, in BNNT lifes
For example dopant atom is constituted by gas phase or liquid phase when long.It is also feasible that doping can BNNT growth after other
Perform in step, wherein, dopant material adds typically under the influence of heat treatment BNNT.By the way that dopant material is added into BNNT,
The representative value that resistivity can be reduced to for the quasiconductor of doping between 0.1 to 1000 Ω cm.
By disclosed, Application No. DE102009033268.5 application after the application moment, by cellulosic material system
Into nano-complex can with the nano-particle of quasiconductor dipping, wherein, be dispersed in absolutely also at least a portion is improved
The being effectively conducted property of the nano-particle in edge material, it is stipulated that adulterate some dopant materials to nano-particle.Receiving using semiconduction
The advantage of rice grain, especially BNNT is, the little compactedness in insulant, the percent by volume of highest 5%, preferably even most
High 2% percent by volume be enough to cause the diafiltration of nanoparticle and the therefore electric conductivity of raising nano-complex.
The content of the invention
Consider the WO2008/026992A1 that beginning is referred to, the technical problem of the present invention is further to improve a kind of beginning
The shading ring of the type so that simplify its manufacture and/or improve the relative electricity on the bed of material by made by cellulosic material
The safety for puncturing.
Thus the technical problem is solved by the present invention, and the bed of material is designed to by answering that processed cellulosic material is constituted
Compound, with the electricalresistivityρ for comparing untreated cellulosic materialpThe granule of less resistivity is with dense higher than percolation threshold
Degree is dispersed in the processed cellulosic material.Additionally or alternatively by the present invention it can be stated that in processed fibre
In dimension cellulosic material, with the electricalresistivityρ for comparing untreated cellulosic materialpThe conducting polymer of less resistance it is mutual
The network of connection passes through complex.Processed cellulosic material can be obtained with starting mode noted above, and or system
Make the formed body to be embedded the toroidal cores of shading ring.Or, paper is fabricated to processed cellulosic material, then therewith
Wind core in known manner together, so as to pass through this winding the bed of material by made by cellulosic material is obtained.
High-voltage dc transmission electrical component is interpreted as this component, and the component is used for transmission of high-voltage direct current electricity and comprising drain
Element.Especially here needs transformator or choke valve as high-voltage dc transmission electrical component.Certainly, connecton layout is also required to for not
The electrical connection of same high-voltage dc transmission electrical component.Other high-voltage dc transmission electrical components are the burble points in these connecton layouts
Or through the insulated sleeve of the housing parts equipped with other high-voltage dc transmission electrical component.Except high voltage direct current to be guided
Outward, alternating current is also for example occurred in transformator and choking-winding.Should be adapted to use by the high-voltage dc transmission electrical component of the present invention
In the transmission at least high voltage direct current of 100kV, high voltage direct current of the transmission more than 500kV is preferably suitable for use in.
The advantage of design by the present invention of processed cellulosic material is, so the resistivity of the complex of formation
ρcompCompare the electricalresistivityρ of untreated cellulosic materialpReduce.Through this it is achieved that the electricalresistivityρ of complexcompBe close to or
It is expanded on further Ru following, even more than oily electricalresistivityρo.Thus achieve to being used for for being formed together by shading ring
The insulating segment of high-voltage dc transmission electric coil (D.C. high voltage transmission transformer coil or D.C. high voltage transmission choking-winding) applies straight
Under stream voltage condition, voltage drop is better distributed on component and transformer oil by made by cellulosic material.On the one hand become
Depressor oil can stand higher voltage drop, without causing electrical breakdown.On the other hand, the load for mitigating cellulosic material is led
Cause, the herein relative safety raising for puncturing, or paper roll or the bed of material manufactured in addition on shading ring can be designed to thinner.
Especially can be in rounding (especially internal rounding) the especially region of application of load back to coil end face of cross section
Load is advantageously greatly lowered, so as to save other insulant（Especially cellulosic material）Pad is below.This
Cause, it can be advantageous to the manufacture of greatly simplified shading ring, while improving the safety of anti-electrical breakdown, or be allowed at least be maintained at
The level of one requirement.Here advantageously, the electricalresistivityρ of the complex at least on the surface of shading ringcompHighest
For 5 × 1013Ωm。
In the electricalresistivityρ of complexcompIt is up to 5 × 1013During Ω m, change is also occurred in a greater degree by voltage drop
On depressor oil, it can be advantageous to well using the effect for removing cellulosic material load described, important for the present invention.
In order to using the effect, people can also advantageously adjust the electricalresistivityρ of complexcomp, the resistivity is the electricity of transformer oil
Resistance rate ρo1 to 20 times.Particularly advantageously it can be stated that the electricalresistivityρ of complexcompBy the order of magnitude equivalent to transformer oil
Resistivity.Mean by the order of magnitude, the electricalresistivityρ of complexcompResisitivity an order of magnitude of highest and transformer oil
(that is highest differs 10 times).
Electricalresistivityρo, ρpAnd ρcompGround relevant with the present invention, should survey respectively under room temperature and existing reference field intensity 1kV/mm
Amount.Under this condition, electricalresistivityρo1012To 1013Between Ω m.It is noted that the electricalresistivityρ of transformer oiloBy the present invention
More specifically reduced by the voltage declined on transformer oil under the higher load for providing.Therefore, also enter below
In the embodiment of one step description, the electricalresistivityρ in transformer oiloFrom 1012Ω m rise.
The electricalresistivityρ of the complex on shielding ring surface is selectedcompWhen importantly, not being significantly lower than in the region
The electricalresistivityρ of transformer oilo.Thus, as has been described, the electric load of transformer oil and cellulosic material can be equal.Certainly
Also can advantageously make the resistivity of the cellulosic material of shading ring further with the increase with the interval of shielding ring surface
Reduce and (be even reduced to less than ρoValue), therefore can realize that electric field is targetedly distributed in the region.This is with special
Degree advantageously contribute to reduce the electric load in the region of rounding have already described above, cross section.
In order to realize electricalresistivityρcompIt is evenly distributed in the thickness of shading ring, can advantageously makes adjacent, formation
The layering of the bed of material resistivity classification, wherein, with minimum specific resistance one or some layering with core adjoin.These layering examples
Such as can be produced by the winding from the paper of different dippings.Then, apply that there is minimum specific resistance ρ first on the corecomp
Layering, then apply at least one have more high resistivity ρcompLayering, wherein, formed side ring surface last layer
The resistivity of transformer oil is at least corresponded advantageously to by the order of magnitude.Each of thickness has same resistivity ρcompRegion point
It is not interpreted as the layering by the present invention.This also means that, the layering can be formed by multiple ply of papers.More than here winding is such
Ply of paper (winding layer) so that reach the desired thickness of layering.
It is another kind of to arrange different resistivity ρ to shading ringcompThe probability in region be, the shading ring by it is multiple with one heart
Inside and outside nested single ring is constituted, wherein, it is internal single to be equipped with the single ring in resistivity ratio outside or multiple follow-up single
The less cellulosic material of ring.Certainly only two single rings are particularly advantageously used.By the present invention, even if single ring is in structure
It is not connected with each other, single ring is also collectively forming shading ring.Therefore, that is to say, that whole part is understood as the shielding by the present invention
Ring, the part is arranged in the end side tip region of coil and with typical shielding ring structure.
Advantageously, inside is equipped with the resistivity less than external rings.It is having described, shading ring cross section back to line
The electric load of the corner of circle end side tip is higher than on outside on the inner side of coil.This can be in design using in shading ring
On cellulosic material when consider.It is possible thereby to be advantageously outside single ring and adjust that there is less concentration, cellulosic material
Dipping, thus can especially save material cost.Advantageously, moreover bigger gap is formed, to make in the desired manner
Electric-force gradient.
Special organization plan regulation of the invention, the bed of material by made by cellulosic material is designed around whole perpendicular to ring
The thickness of the cross section of trend is substantially identical.The design is achieved in that as described above so that by cellulose of the present invention
The resistivity of material is matched in this wise with the demand of electric-force gradient so that electric load is better distributed in each area of shading ring
On the transformer oil of domain and surrounding.The cellulosic material of thickness for being designed to be substantially identical is interpreted as shading ring and only passes through paper
The layer that band is produced around the winding of core.Here be naturally the layer that wound on the inside of the ring on it is more thick than on the outside of ring because this
The adjacent winding ring knot of the paper that place uses intersects slightly more severe.Certainly, it is contemplated that the diameter of core to be wound, substantially
The layer for having wound is considered as the structure with substantially the same thickness.
The cross section entirely perpendicular to ring trend is designed around in the bed of material by made by cellulosic material to be directly supported at
When on core, another organization plan of the present invention is obtained.It means that saving interlayer that is additional, needing additional fabrication cost.
Therefore, manufacturing expense can be reduced advantageous by the saving of additional interlayer.Thus manufacturing expense is not only reduced, but also
Higher process safety is realized, because the interlayer that for example can be skidded in winding can be saved.
Advantageously also feasible to be by using the cellulosic material by the present invention, the height h of shading ring compares replacement and is combined
Thing is reduced using height required during related untreated cellulosic material.Further possibility is advantageously, the bed of material
Thickness s compares the thickness required when replacing complex to use related untreated cellulosic material and reduces.Further, it is also possible to
Regulation, shading ring advantageously has perpendicular to ring trend, the rectangular cross section with rounding, wherein, the half of the rounding
Footpath r compares the radius required when replacing complex to use related untreated cellulosic material and reduces.Setting in these structures
Meter feature advantageously can change according to the design gaps in the structure for having illustrated, wherein, here can consider use occasion
The boundary condition of geometry.For example it is possible that by providing insulating segment, shielding is reduced in high-voltage dc transmission piezoelectric transformer
The height h of ring, if the insulating segment does not use the cellulosic material by the present invention, gets in the running voltage of high-voltage dc transmission electrical component
Come higher, partly more than 1000kV in the case of will extremely take up room.On the other hand, prespecified D.C. high voltage transmission group
Full-size in part structure, for example to realize by railway transportation.Here, the chi with the geometry for reducing
Very little shading ring may consequently contribute to the reduction of structure space.Certainly structure space, that is, the height h or the bed of material of shading ring are being reduced
Thickness s when, it is considered to prevent the safety of electrical breakdown on the whole still equivalent at least previously given value.
The reduction of the radius r of the transversal face blend corner of shading ring is a major advantage that the shading ring can bear bigger
Mechanical load, so that all parts of high-voltage dc transmission electrical component keep together.Simultaneously by save core and this around
Interlayer between layer is also obtained in that the result for reducing the radius, therefore the material for passing through core by the structure space that the interlayer needs
Filling.
Description of the drawings
The following other details for describing the present invention with reference to the accompanying drawings.Identical or corresponding figure elements are respectively with identical accompanying drawing
Therefore labelling sign simultaneously only repeatedly illustrates the difference before each accompanying drawing.In accompanying drawing：
Fig. 1 is the section of the embodiment of the shading ring by the present invention, wherein only illustrating its surface and transformation adjacent therewith
Device oil and by made by press board other solid barrier parts,
Fig. 2 is by the simple section of one embodiment of the shading ring being fitted in high-voltage dc transmission piezoelectric transformer of the present invention
Figure and
Fig. 3 is the simple cross section of one embodiment by the shading ring of the present invention, wherein, it is illustrated that it is determined that structure on
Design gaps.
Specific embodiment
It is made up of the layer of multiple cellulosic materials 19 by the insulative segment 18 of Fig. 1, is there may be between, the layers
Oil reservoir 20.Insulating segment originates in the metal surface 11 of part 12 to be insulated, and the metal surface for example can be by not detailed
Metal level 13 on the core of the shading ring for illustrating is formed.Cellulosic material 19 is also wet with oil immersion, and this is not shown specifically in FIG.
For this purpose, in FIG, in the visible dipping thing 11 in the inside of cellulosic material.Seal as shown in Figure 1 is for example in transformator
The winding used at this is surrounded, the winding must outwards and electrically insulated from one another.
When under alternating voltage effect, the electric insulation of transformator must under operating conditions prevent electrical breakdown.In this feelings
Under condition, the insulation characterisitic of insulating barrier is relevant with the dielectric constant of the component of insulating barrier.For oil, electric permittivity epsilonoAbout 2, and cellulose
The electric permittivity epsilon of materialpFor 4.Therefore, when alternating voltage is added to insulant, for the load of each insulation assembly, on oil
Voltage UoIt is approximately the voltage U on cellulosic materialpTwice.If using nano-complex, wherein, cellulosic material 19 is by this
Invention dipping, then impregnating thing 11 does not affect the voltage's distribiuting in the insulant by the present invention, because electric permittivity epsilonBNNTEqually
About 4 and the therefore electric permittivity epsilon of impregnated cellulosic materialcompAlso about 4.Therefore, even if when by present invention insulation, making
Voltage U on oiloAlso about act on the voltage U on nano-complex (cellulosic material)compTwice.
Meanwhile, under DC voltage effect, in high-voltage dc transmission electrical component, the breakdown strength of insulant is important
's.Therefore, voltage's distribiuting present on insulating component certainly at each is no longer relevant with dielectric constant, and with the electricity of each component
Resistance rate is relevant.The electricalresistivityρ of oilo1013To 1012Between Ω m.It should be considered that carrying out larger portion of voltage by the present invention
The load of cellulosic material and the resistivity of oil in dropping to mitigate oil reduces when there is voltage, more precisely, such as
Shown in Fig. 1, electricalresistivityρoFrom 1012Ω m rise.Correspondingly, the ρ of cellulosic materialpIt is higher by three orders of magnitude and for 1015Ω
m.This causes, and the voltage Uo on oil under DC voltage effect is the voltage U on cellulosic materialpOne thousandth (assume ρo
=1013It is at least one of percentage during Ω m one of to five percentages).This uneven hiding danger is being applied to insulant
Cause puncturing in cellulosic material during DC voltage and the failure that is electrically insulated.
By present invention introduces cellulosic material 19 dipping thing 11 for example can be made up of BNNT and by be adapted to by
PEDOT:The BNNT bed of materials that PSS is constituted and may when by additionally to BNNT being doped with its resistivity (0.1 and 1000
Between Ω m) dopant material adjust in this wise so that cellulosic material ρpResistivity reduce.This is also by uniquely using
PEDOT:PSS is uniquely realized using BNNT.Therefore, it can adjust the electricalresistivityρ of the complex by the present inventioncomp, the resistance
Rate ρcompClose electricalresistivityρoAnd it is approximately equal to the electricalresistivityρ in the ideal caseo.Work as electricalresistivityρcompIt is up to 5 × 1013Ωm
When, act on the voltage U on oiloBy the order of magnitude in the voltage U being formed on complexcompIn the range of, to adjust insulation material
The voltage's distribiuting of the compensation in material.Thus the breakdown strength of insulant is advantageously improved, because the load of cellulosic material is bright
It is aobvious to reduce.
The section of visible high-voltage dc transmission piezoelectric transformer in fig. 2, the high-voltage dc transmission piezoelectric transformer is arranged on also referred to as
In the housing of oil tank of transformer 21.High-tension coil and low-voltage coil are further there is illustrated, their winding 22,23 in fig. 2 may be used
See.In order to sight line is clear, transformer core 14 only shows schematically.
For winding 22, electric field is illustrated by field wire 33, the field wire extends in the equipotential surface of electric field.The electric field is received
To the impact of the different elements of seal, these elements are also with as the graded insulation ring 24,25 of element, by press board
The circular cylindrical solid shielding part 26 of composition and the angular ring 27 being equally made up of press board.Shading ring 24,25 has with gold
The core 28 and paper roll 30 of metal surface 29.Additionally, inner space 31 is filled with transformer oil, therefore transformer oil also flows into insulation dress
In gap 32 between each element put and fill up the gap 32.Additionally, electric field line 33 is also extended through by blook board
(Blockspan) thrust ring 34 made by.Therefore, by the resistivity of cellulosic material by decline of the invention, it is also possible to change
Become thrust ring 34, so as to the electric field for affecting to be formed in the region.Thrust ring 34 with it is unshowned, be equally made up simultaneously of blook board
And the winding platform of supporting winding 22,23 jointly ensures that all parts are mechanically joined together (including solid barrier
Part).Within the scope of the invention, thrust ring 34 and unshowned winding platform are it can be appreciated that the element of insulating segment.
In figure 3 it can be seen that being made up of the single ring 36 of internal single ring 35 and outside by the shading ring 24 of the present invention.Screen
Thickness s of the ring 24 with height h and the bed of material 30 is covered, as shown in the figure.Additionally, cross section shown in figure back to unshowned coil
Rounding be provided with radius r.In figure 3, the contour line being equally represented by dotted lines is illustrated, and does not arrange the cellulosic material of dipping
The geometry of shading ring qualitatively compares the outward appearance for appearing likely to.The shading ring has bigger height h0And/or it is bigger
The bed of material 30 thickness S0And/or on above-mentioned angle bigger radius r0, wherein, higher radius r0Only described by core 28, with
Just it is formed in the region for the additional space of interlayer by made by cellulose not shown further.It can be arranged on
By radius r and roIn the space of formation.
In addition visible, the layer of internal single ring 35 is constituted by being layered 37,38.Formed shading ring 24 surface layering 37 with
And the bed of material 30 of outside single ring 36 have press resistivity of the order of magnitude equivalent to transformer oil around.By comparison, with core 28
The resistivity of adjacent layering 38 further reduces, so that this resistivity is less than the resistivity of transformer oil.Which reduce screen
Cover load of the ring 24 by the voltage drop of the D.C. high voltage transmission DC voltage region of application of load most strongly.The region is located at shielding
The cross section of ring with regard to shading ring ring trend for back in the inner corners of coil.For other regions of internal single ring,
Reduction itself near the resistivity of the layering 38 of core is unnecessary.But this is also harmless, therefore For manufacturing technology reasons,
Internal single ring 38 winds completely together with the layering 38 near core.Certainly, for outside monocyclic 36, for cost reasons,
Additional winding together with the material that stopping is less than transformer oil with resistivity.Herein, resistivity is reduced to into transformator by the order of magnitude
Just it is enough for the value of oil.
Claims (12)
1. a kind of for D.C. high voltage transmission transformer coil or the shading ring of D.C. high voltage transmission choking-winding, shading ring tool
Have
Toroidal cores (28) with conductive surface (29),
The bed of material (30) by made by cellulosic material (19), core (28) described in the bed of material (30) comprehensive surrounding,
Wherein, the bed of material (30) is designed to the complex being made up of processed cellulosic material,
In the cellulosic material, with the resistivity (ρ for comparing untreated cellulosic materialp) less resistivity
Granule (11) is disperseed with the concentration for being higher than percolation threshold, and/or
In cellulosic material, with the resistivity (ρ for comparing untreated cellulosic materialp) less resistivity conduction
Property polymer the network for interconnecting pass through complex,
Characterized in that, the shading ring is made up of multiple nested single rings inside and outside with one heart, wherein, it is inner most described single
The cellulosic material of the resistivity that ring arranging has than one or some outside described single rings are less.
2. the shading ring as described in claim 1,
Characterized in that,
The cellulosic material (19) is paper.
3. the shading ring as described in claim 1,
Characterized in that,
Resistivity (the ρ of the complex at least on the surface of the shading ringcomp) it is up to 5 × 1013Ωm。
4. the shading ring as described in claim 3,
Characterized in that,
Resistivity (the ρ of the complex at least on the surface of the shading ringcomp) for transformer oil resistivity 1 to
20 times.
5. the shading ring as described in claim 3, it is characterised in that
Resistivity (the ρ of the complex at least on the surface of the shading ringcomp) order of magnitude is pressed equivalent to transformer oil
Resistivity (ρo)。
6. the shading ring as described in one of claim 1 to 5, it is characterised in that
Adjacent each formed the bed of material (30) layering (37, resistivity classification 38), wherein, one or some have most
The layering of small resistor rate is adjacent with the core.
7. the shading ring as described in one of claim 1 to 5, it is characterised in that
The bed of material (30) by made by the cellulosic material is designed around the thickness base of the whole cross section perpendicular to ring trend
It is equal in sheet.
8. the shading ring as described in one of claim 1 to 5, it is characterised in that
The bed of material (30) is directly supported at described around the cross section entirely moved towards perpendicular to ring by made by cellulosic material
On core.
9. the shading ring as described in one of claim 1 to 5, it is characterised in that the bed of material is by the paper roll with multiple volume layer
Composition, wherein, the paper roll is around the cross section winding perpendicular to ring trend.
10. the shading ring as described in one of claim 1 to 5, it is characterised in that
The height (h) of the shading ring is compared and replaces the complex to use height required during related untreated cellulosic material
Degree reduces.
11. shading rings as described in one of claim 1 to 5, it is characterised in that
The thickness (s) of the bed of material (30) is compared required when replacing the complex to use related untreated cellulosic material
The thickness wanted reduces.
12. shading rings as described in one of claim 1 to 5, it is characterised in that
The shading ring have perpendicular to ring trend the rectangular cross section with rounding corner and
The radius (r) of the rounding corner is compared and is replacing the complex to use related untreated cellulosic material when institute
The radius of needs reduces.
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 CN103415901A (en) | 2013-11-27 |
| CN103415901B true 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1180054B (en) * | 1961-11-23 | 1964-10-22 | Licentia Gmbh | Process for the production of angle rings for transformers and choke coils that slide between two insulating cylinders |
| DE1488228A1 (en) * | 1964-11-26 | 1969-04-10 | Licentia Gmbh | Control tape for high voltage electrical devices |
| 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 |
| SE525492C2 (en) | 2002-10-22 | 2005-03-01 | Abb Research Ltd | Field-controlling polymer matrix provided with filling |
| WO2005036563A2 (en) | 2003-08-21 | 2005-04-21 | Rensselaer Polytechnic Institute | Nanocomposites with controlled electrical properties |
| WO2006122736A2 (en) | 2005-05-19 | 2006-11-23 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Nanotube composite systems, method for producing the same and use of the same in heating elements |
| CN101253582B (en) | 2005-06-07 | 2011-06-29 | Abb研究有限公司 | Bushing, high voltage/medium voltage equipment using same, and method for manufacturing the bushing |
| DE102007018540A1 (en) | 2007-04-19 | 2008-10-30 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Electrically conductive composition for use as transparent or non-transparent conductive coating for resistance heating elements e.g. for heating disks, comprises electrically conductive polymer, carbon nanotubes and baytron |
| WO2011003635A1 (en) | 2009-07-08 | 2011-01-13 | Siemens Aktiengesellschaft | Nanocomposite comprising semiconducting nanoparticles |
| WO2011003634A1 (en) | 2009-07-08 | 2011-01-13 | Siemens Aktiengesellschaft | Nanocomposite comprising boron nitride nanotubes |
| DE102010041630B4 (en) | 2010-09-29 | 2017-05-18 | Siemens Aktiengesellschaft | Use of an electrically insulating nanocomposite with semiconducting or nonconducting nanoparticles |
| DE102010041635A1 (en) | 2010-09-29 | 2012-03-29 | Siemens Aktiengesellschaft | Impregnated cellulosic material, use of this cellulosic material and process for its preparation |
-
2011
- 2011-01-07 DE DE102011008462A patent/DE102011008462A1/en not_active Ceased
- 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
- 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
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
|---|---|
| CN103415901A (en) | 2013-11-27 |
| EP2661760A1 (en) | 2013-11-13 |
| EP2661760B1 (en) | 2018-07-11 |
| BR112013017401A2 (en) | 2016-10-04 |
| WO2012093052A1 (en) | 2012-07-12 |
| DE102011008462A1 (en) | 2012-07-12 |
| BR112013017401B1 (en) | 2020-09-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103415901B (en) | Grading ring for an HVDC transformer winding or an hvdc reactor winding | |
| CN103403818B (en) | Wiring arrangement for HVDC transformer windings or HVDC reactor windings | |
| CN201134338Y (en) | High-voltage transformer with shielding ring and shielding ring thereof | |
| CN103415971B (en) | Disconnection point of a wire feedthrough for an hvdc component | |
| CN103680699B (en) | Silicon multilevel insulator for cable | |
| CN103415894B (en) | The seal for D.C. high voltage transmission assembly with wall-like solid insulation | |
| US20130240249A1 (en) | High-voltage bushing with conductive inserts for dc voltage and method for producing the bushing | |
| WO2011138413A2 (en) | Electrical insulation material and insulating tape for electrically insulating a medium and high voltage | |
| CN102760526A (en) | Ceramic silicon rubber insulation medium-voltage fire-resistant cable with rated voltage of 6-35kV and machining process thereof | |
| CN110168687A (en) | Solid electrolytic capacitor | |
| CN201134278Y (en) | Frequency converter cable | |
| CN109991467B (en) | Validation of overvoltages | |
| KR20170109679A (en) | Inorganic electrical insulation material | |
| CN103403254B (en) | Be used for the connecton layout of the chamber wall of high-voltage dc transmission electric components | |
| US8044550B2 (en) | Roebel bar for rotating electrical machines | |
| CN203325604U (en) | High voltage casing | |
| CN101606209A (en) | Transformer | |
| WO2005045853B1 (en) | System for transmission of electric power | |
| US20190149006A1 (en) | Method for producing corona discharge-preventing structure, corona discharge-preventing structure, and rotating electrical machine | |
| CN107808717A (en) | A kind of oil-impregnated paper insulation cable | |
| CN206834044U (en) | Power transformer based on graphene wire | |
| EP3410451B1 (en) | Shield ring for a transformer coil | |
| WO2022223161A1 (en) | Bushing comprising a condenser body and electrical facility with bushing | |
| DE102017212026A1 (en) | Shield ring and / or pitch compensation for a transformer coil |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170517 Termination date: 20201227 |