Coil block fixation system for a transformer and transformer

Abstract

A coil block fixation system (30) for a transformer comprises a coil block body to be coupled to a coil (19) of the transformer, and a supporting plate that is coupled to an upper surface (23) of the coil block body (10) oppo site a bottom surface (24) of the coil block body (10). The coil block fixation system (30) further comprises two or more rods (3) that are coupled to an upper surface (21) of the supporting plate (1) opposite a bottom surface (22) of the supporting plate (1) for setting a load to the supporting plate (1) towards the coil block body (10). The supporting plate (1) and the coil block body (10) are formed geometrically in coordination with each other such that one comprise at least one recess (13, 14) and the other one comprise at least one protrusion (9, 16) that extends into the corresponding recess (13, 14) forming a respective movement limiter to counteract a translation and / or a rotation of the supporting plate (1) relative to the coil block body (10).

Description

[0001]P2024,0013 WO N / P230186WO01 November26,2024 -1 - Description COIL BLOCK FIXATION SYSTEM FOR A TRANSFORMER AND TRANSFORMERThe present disclosure is related to a coil block f ixationsystem for a transformer and a corresponding transf ormer.Transformers are installed for example in wind-powe rfacilities and can be subject to instantaneous acce lerationsdue to high loadsthatmayoccurduring operation,transportation and others. Document EP 3817015 A1 disclosesa coil block for an electrical transformer. The coi l block isconfigured for supporting at least one coil winding in anelectrical transformer. The coil block includes a f irstelementhaving atleastone supporting surface for contacting the atleastone coilwinding and a firstclamping surface,and a second element having fastening means and a s econdclamping surface forcontacting the firstclamping surface to restrictrotation ofthe coilblock.The documents CN 217181983 U, JP 2004207330 A an d CN 106298198 A disclose furthersetupsoftransformers or componentsthereof. Extreme loading conditionshave to be counteracted to contribute to a longerservice life and a reliable operation ofthe transformerand itswindings.Consequently, itisatask to provide a system for a transformer that ena bles towithstand such challenging operationalconditions.Thus, it is an objective to provide a coil block fi xationsystem for a transformer that contributes to a long er servicelife and stable and reliable operation of the trans former. P2024,0013 WO N / P230186WO01 November26,2024 -2 -According to an embodiment, a coil block fixation s ystem fora transformer comprises a coil block body with a bo ttomsurface that is configured for coupling to a coil o f thetransformer. The coil block fixation system further comprisesa supporting plate with a bottom surface that is co upled toan upper surface of the coil block body opposite th e bottomsurface of the coil block body. The coil block fixa tionsystem further comprises at least two rods that are coupledto an upper surface of the supporting plate opposit e thebottom surface ofthe supporting plate forsetting a load tothe supporting plate towards the coil block body. T hesupporting plate and the coil block body are formedgeometricallyin coordination with each othersuch thatatleast one of the supporting plate and the coil bloc k bodycomprises one or more recesses and the other one of thesupporting plate and the coilblockbodycomprises one ormore protrusion that extends into the corresponding recess ofsupporting plate or the coil block body. The protru sionwithin the recess forms a respective movement limit er tocounteract a translation and / or a rotation of the s upportingplate relative to the coilblockbody.The coil block fixation system the supporting plate furthercomprises a first lateral recess formed at a side s urface ofthe supporting plate and the coil block body compri ses acorresponding protrusion that forms a lateral movem entlimiter extending into the lateral recess of the su pportingplate.The supporting plate further comprises a second lat eralrecess formed at a lateral side surface of the supp ortingplate opposite the first lateral recess. The coil b lock body P2024,0013 WO N / P230186WO01 November26,2024 -3 -comprises a further corresponding protrusion that f orms afurther lateral movement limiter extending into the secondlateral recess of the supporting plate. Thus, the s upportingplate comprises a substantially rectangular externa l shapewith four outer edges or corners, and the supportin g plateincluding the opposite first end second lateral rec essessubstantiallyhasan H-shape with respectto a top view onto the uppersurfaces.By use of the described fixation system a transform er isfeasible that enables to withstand accelerations du e to highloadsduring operation,transportation and others. Thefixation system provides a specific design of the c oil blockbody in coordination with the supporting plate on t op whichallows for an advantageous configuration with parti cular highmechanicalstabilityofthe transformerin view of compensation ofmovementsthatare unavoidable.The supporting plate comprises a substantially rect angular orcuboid shape with rounded edges and / or corners, pre ferably,apart from one or more recesses and / or protrusions. Thespecificconfiguration ofthe supporting plate canbeneficially counteract an unwanted translational a nd / or arotational movement of the supporting plate relativ e to thecoilblockbody.According to a further embodiment of the coil block fixationsystem,the coilblockbodycomprisesa protruding bodywall forming a furtherlateralmovementlimiterthatis adjacentto an inner edge of the supporting plate. Such a li mitingwall can be formed on an inner edge of the coil blo ck bodywith respect to an assembled state when the coil bl ock P2024,0013 WO N / P230186WO01 November26,2024 -4 -fixation system is attached to a circular coil of t hetransformer,forexample.The protruding bodywall canreliably counteract an unwanted translation movemen t of thesupporting plate towards the centre. In addition, t heprotruding body wall in contact with the adjacent e dge of thesupporting plate counteracts an unwanted rotational movement.Alternatively or additionally, the supporting plate cancomprise a lateral movement limiter formed at a sid e surfaceof the supporting plate extending into a lateral re cess ofthe coil block body formed in an upper surface or w all of thecoil block body, for example formed in the describe dprotruding wall of the coil block body. In particul ar, such alateral movement limiter can reliably counteract an unwantedrotation ofthe supporting plate around an axisof rotationwhich may be parallel to a longitudinal axis of the elongatedrod substantially. Additionally, such a lateral mov ementlimiter can counteract an unwanted translation in d irectedlimited by a recess contour of the coil block body.Alternatively or additionally, the supporting plate cancomprise a lower movement limiter formed at the bot tomsurface of the supporting plate extending into an u pperrecess of the coil block body formed in the upper s urface ofthe coil block body. In particular, such a lower mo vementlimiter can reliably counteract an unwanted transla tion ofthe supporting plate in a plane substantially perpe ndicularto the aforementioned axis of rotation. Additionall y, such alower movement limiter can counteract an unwanted r otation inthe aforementioned plane and also in a transverse p lane toit. The one or more protrusions forming limiters ca n beformed in one piece with the supporting plate or th e coilblockbody,in particular. P2024,0013 WO N / P230186WO01 November26,2024 -5 -According to a further embodiment, the coil block f ixationsystem comprises at least two spring elements where in arespective one is coupled to the associated rod suc h thateach rod interacts with at least one spring element and suchthat the load set to the supporting plate is provid ed with agiven flexibility with respect to a mounting direct ion fromthe coil block body to the rods. Such a configurati oncombines an advantageous compromise between high st abilityand flexibility of the transformer in view of movem ents thatare unavoidable.According to a further embodiment, the rods are for med asthreaded pins each, and the coil block fixation sys temfurther comprises two or more nuts which are config ured incoordination with the respective associated threade d pin. Dueto the threaded pins and associated nuts as well as thespring elements the load set to the supporting plat e isadjustable and fixable by means of the nuts screwed on thethreaded pins. For example, the nuts are screwed on thethreaded pins such that the nuts are arranged betwe en theupper surface of the supporting plate and the one o r morespring elements.According to a further embodiment, the coil block f ixationsystem further comprises two or more positioning el ementswherein at least one positioning element is coupled to therespective rod such that it is arranged between theassociated nut and spring element with respect to alongitudinal direction of the corresponding rod. Th epositioning elementformsa supportforthe one or morespring elements attached or coupled to the associat ed rod.Additionally or alternatively, the positioning elem ent can P2024,0013 WO N / P230186WO01 November26,2024 -6 -form a fixing for the adjusted nut configured to pr eventloosening of the set nut positioning and load to th esupporting plate.According to a further embodiment, the spring eleme nts areformed as spring washers surrounding the associated rod. Thespring washers are feasible in a cost-saving manner aselastic metal rings providing a predetermined flexi bility intthe coil block fixation system. The springs washers can alsobe referred to asdiscsprings.According to a further embodiment, the coil block f ixationsystem further comprises two or more sliding guider s whereinatleastone sliding guideriscoupled to each rod such that the associated spring elementisslidable along alongitudinal direction of the rod by means of the s lidingguiders. The sliding guiders can be formed as respe ctivesleeves place on the associated rod and which surro unding it,respectively. Such sleeves would be arranged betwee n the rodand the spring washer to provide guided and low-res istancesliding up and down along the longitudinalaxisof thecorresponding rod. The sliding guider can be formed in onepiece with the positioning elementdescribed above forming asleeve with a disc-like support surface which could comprisea kind of T-shaped tube with respect to a cross sec tion.According to a further embodiment, the coil block f ixationsystem further comprises three or more rods and cor respondingspring elements.The rodsare coupled to the upper surface ofthe supporting plate for setting a load to the supp ortingplate towards the coil block body. The three or mor e springelements are coupled to the associated rod such tha t each rodprovidesa respective load to the supporting plate with a P2024,0013 WO N / P230186WO01 November26,2024 -7 -respectively given flexibility along the mounting d irectionfrom the coil block body to the rods. The three rod s realizea three-point-contact to the supporting plate and c anbeneficially affect the stability and flexibility o f the coilblock fixation system and the corresponding transfo rmer.Moreover, the three rods and the corresponding spri ng washersor spring element can provide equal or different lo cal loadsto the supporting plate.Differentlocalloadscan berealized by using different spring elements includi ngdifferent material or elastic properties and / or a d ifferentnumber of spring elements. This analogously applies to aconfiguration with two rods and associated spring e lements.Alternatively, the coil block fixation system merel ycomprises one rod and at least one corresponding sp ringelement coupled to the upper surface of the support ing plateforsetting a load to the supporting plate towards the coilblock body. In order to provide an enhanced stabili ty and towithstand high loads two, three or more rods are pr eferred.Apart from the preferred U-shape or H-shape, the su pportingplate can comprise a trapezoidal shape or a triangu lar, apentagonal or polygonal shape with sharp and / or rou nded edgesand / or corners depending on the intended implementa tion in orat the transformer. The rods can be fixed to the su pportingplate closer to an outer edge of the supporting pla te than toan inneredge ofthe supporting plate with respect to amounted state of the coil block fixation system cou pled to anannular shaped coil of the transformer. With respec t to suchan operational state, the inner edge of the support ing platefaces a centre of the coil and the outer edge faces outwardawayfrom the centre. P2024,0013 WO N / P230186WO01 November26,2024 -8 -The coils or windings of transformers are formed ci rcularlyin generaland thuscomprise a centre and an outer region.The aforementioned configuration can beneficially c ontributeto the stabilityand flexibilityofthe coilblock fixationsystem and advantageously affect an operation of th etransformer even despite unavoidable vibration move ments. Thespecificlocation ofthe rodsand theirrespective localloadto the supporting plate can be adapted to the inten ded useand application ofthe associated transformersuch that,for example,a higherlevelofstabilization issetup furtheroutside than inside. Alternatively, the rods can be arrangedfurtherinsiderthan outside orin a centre region ofthe supporting plate substantially.According to a further embodiment, the supporting p latecomprises a T-shape with a lower protrusion and lat eral plateportionswith respectto a crosssection along the mountingdirection. The lateral plate portions extend latera llyoutwards from the protrusion and contacts the upper surfaceof the coil block body. Accordingly, the lateral po rtions ofthe supporting plate can reliably counteract an unw antedrotation around an axis of rotation which may be pa rallel toa main extension plane or to the extrusion directio n of thesupporting plate.According to an embodiment, a transformer comprises a coilfor converting voltage, and a coil block fixation s ystemaccording to any of the preceding claims that is co upled tothe coil. In general, the transformer comprises two or morecoils and the coil block fixation system can be cou pled toboth coils. As a result of that the transformer com prises anembodiment of the coil block fixation system as des cribedabove, features and characteristics of the coil blo ck P2024,0013 WO N / P230186WO01 November26,2024 -9 - fixation system are also disclosed with respectto the transformerand vice versa. Itisa recognition ofthe presentdisclosure that transformers,which can be installed in wind-powerfacilities, can be subject to instantaneous acceler ations dueto mechanical and / or electromechanical loads that m ay occurduring operation, transportation and others. Mechan icalshocks can occur from a rapid stop of the wind turb ine bladesor from geometrical and material configurations and theassociated resonance frequencies,forexample.Electromechanical shocks can appear in view of freq uencyrequirementswhich have to be fulfilled in view of theassociated amplitudes or other operation parameters of thetransformer. Such high loading conditions highlight s theinherent structural weakness in conventional fixing systems.Accordingly, it is a challenge to improve a transfo rmer'sability to withstand such demanding operational con ditions.It is a further recognition of the present disclosu re thatthe aforementioned problems are primarily focused o n astructural weakness of a standard coil block itself which isvulnerable and has a tendency for structural failur e. Thiscan lead to disassembling further leading to potent ialperformance and reliability degradation of the tran sformer.Another critical issue that can occur during testin g is thetendencyfornutsto loosen underthe displacement induced bythe extreme shocks and vibrations. These weaknesses highlightthe need for a more robust coil-block design capabl e ofwithstanding the demanding conditionsspecified by the customertesting requirements. P2024,0013 WO N / P230186WO01 November26,2024 -10 -The described coil block fixation system can counte ract theaforementioned adverse effects and shortcomings. Th e coilblock fixation system can be realized as a H-shaped flangefixation that allows for stable and reliable operat ion of thetransformer in particular in view of shock and sine beat loadrequirements due to its spring washers and the spec ificdesign options which contribute to an enhanced over allrobustness.The specifically shaped supporting plate and coil b lock body,preferably in interaction with the specific rods an dassociated spring elements, are specifically engine ered towithstand high acceleration shocks. Integrated in o r attachedto a transformer, the coil block fixation system ca ncontribute to prevent structural damages and perfor manceissues under extreme loading condition. The H-shape dsupporting plate can reliably provide mechanical st abilityand shock resistance of the coil block fixation sys tem andthe corresponding transformer. The spring elements,preferably formed as spring washers, can reliably a bsorbthermal dilatation of a winding or coil of the tran sformerwhile maintaining beneficial stiffness, specificall y tuned,to withstand dynamic loads. Thus, an overall resili ence andperformance of transformers can be improved even in view ofhigh acceleration shocks. The described configurati ons of thecoil block fixation system can provide a beneficialcompromise between the necessity for having a stiff coil-block to support the windings or coils of the trans formerbeing subject to extreme loads and, at the same tim e,providing a sufficient room for the thermal expansi on of thewindings or coils. The coil block body may comprise a bulkystructure itself with some protrusions and / or reces ses thatserve as interface for the supporting plate and the assembled P2024,0013 WO N / P230186WO01 November26,2024 -11 -rods and spring washers. The rods form pins through which aproper pre-load on the coils of the transformer can beapplied.The combination ofthe preload and spring washers'stiffness can advantageously contribute to required stabilityand robustnessofthe transformer.The described coil block fixation system can contri bute to anenhanced lifetime or service life, can allow for ea symounting and also passes several tough requirements includingsine beat tests based on increasing amplitudes with fixedfrequencyrequirementsbya customer.In addition, the coilblock fixation system passes mechanical resonance c hecks dueto the counteracting damping set up by the describe dconfigurations.Exemplary embodiments are explained in the followin g with theaid of schematic drawings and reference numbers. Th e figuresshow:Figure 1 an embodiment of a coil block fixation sys tem for atransformerin a perspective view,Figure 2 a cross section side view of components of the coilblockfixation system offigure 1,andFigure 3 an embodiment of a coupling structure incl uding aplurality of the coil block fixation systems couple d to atransformer. The accompanying figuresare included to provide a furtherunderstanding. Identical reference numbers designat e elementsor components with identical functions. In so far a s elementsor components correspond to one another in terms of their P2024,0013 WO N / P230186WO01 November26,2024 -12 -function in different figures, the description ther eof is notrepeated for each of the following figures. For the sake ofclarity elements might not appear with correspondin greference symbolsin allfigures,possibly.Figure 1 illustrates a perspective view an embodime nt of acoil block fixation system 30 for a transformer. Th e coilblock fixation system 30 comprises a coil block bod y 10 witha bottom surface 24 and an upper surface 23 opposit e thebottom surface 24. The bottom surface 24 is configu red forcoupling to a coil 19 of the transformer by means o f acontact element 20, such as a rubber pad or silicon rubber.The coil block fixation system 30 further comprises asupporting plate 1 with a bottom surface 22 and an uppersurface 21 opposite the bottom surface 22. The bott om surface22 is coupled to the upper surface 23 of the coil b lock body10. The supporting plate 1 has a specific H-shape w ithrespect to a top view onto the upper surface 21 alo ng the z-direction. The supporting plate 1 is specifically c onfiguredand geometrically formed in coordination with the c oil blockbody10 and comprisesrounded edgesand corners.The supporting plate 1 comprises a first lateral re cess 13formed ata side surface ofthe supporting plate 1 and asecond lateral recess formed at a lateral side surf ace of thesupporting plate 1 opposite the first lateral reces s 13. Thecoil block body 10 comprises corresponding protrusi ons thatform respective lateral movement limiter 16 extendi ng intothe associated lateralrecess13 ofthe supporting plate 1.The protrusions or the movement limiter and the cor respondingrecesses are formed to counteract a translation and / or a P2024,0013 WO N / P230186WO01 November26,2024 -13 - rotation ofthe supporting plate 1 relative to the coilblock body10.A further lateral movement limiter is formed by a p rotrudingwall 15 at an inner edge of the coil block body 10. Theprotruding body wall 15 is adjacent to an inner edg e of thesupporting plate 1 and can reliably counteract an u nwantedtranslation movement of the supporting plate toward s thecentre in x-direction.In addition,the protruding bodywall15 in contact with the adjacent edge of the support ing plate1 counteractsan unwanted rotationalmovement.Theprotrusions and / or recesses of the supporting plate 1 and thecoil block body 10 are designed such that the suppo rtingplate 1 tightlyfitsinto the coilblockbody10.The coil block fixation system 30 further comprises two rods3 that are coupled to the upper surface 21 of the s upportingplate for setting a load to the supporting plate to wards thecoil block body. The rods 3 can be securely fixed t o thesupporting plate 1 by means of welding. The specifi c locationof the rods 3 and their respective local load which sum up toa predetermined totalload to the supporting plate 1 can be adapted to the intended use and application ofthe coilblockfixation system 30 its implementation in or at an a ssociatedtransformer.The coil block fixation system 30 further comprises fourspring elementswhich are formed asspring washers 2 two of which surround an associated rod 3.The rods3 and the springwashers 2 are configured to set a predetermined loa d to thesupporting plate 1 with a given flexibility with re spect to amounting direction from the coil block body 10 to t he rods 3.According to coordinate system shown in the Figures 1 to 4, P2024,0013 WO N / P230186WO01 November26,2024 -14 -the mounting direction represents a vertical direct ion or z-direction. The z-direction also equals the longitud inaldirection of the rods 3. The x- and y-direction rep resenthorizontal directions and consequently span a horiz ontalplane. The rods3 are formed asthreaded pinseach,andcorresponding nuts 5 are configured in coordination with thethreaded pins such that the load set to the support ing plate1 isadjustable and fixable bymeansofthe nuts5 screwed onthe threaded pins. The nuts 5 are screwed on the th readedpinssuch thatthe nuts5 are arranged between the uppersurface 21 of the supporting plate 1 and the two sp ringwashers 2 above. With respect to the z-direction, arespective positioning element4 iscoupled to the rods3between the associated nut 5 and spring washer 2 (o ne rod 3is illustrated without further elements above the w ashers 2merely for better illustration). The positioning el ement 4formsa supportforthe above two spring washers2 and alsoforms a reliable fixing of the adjusted nut 5 in or der toprevent loosening of the set nut position and the a djustedload to the supporting plate 1.On the side of the washers 2 opposite the positioni ng element4 a welding seam 17 and a rod sleeve 7 are illustra ted to thesurround a respective rod 3 thatextendsthrough a couplingstructure 26 of the transformer (see Fig. 3). The s leeve 7 isfixed to the coupling structure 26 bymeansofthe weldingseam 17 and limits an allowed movement of the washe rs 2 in z-direction and realize a stable movement guidance of the rods3 and the corresponding coilblockfixation system 30 in interaction with the coupling structure 26 ofthetransformer. The rod sleeve 7 limits the associated rod 3 and P2024,0013 WO N / P230186WO01 November26,2024 -15 -the positioning element 4 tilting while still leavi ng theirtranslation in vertical direction free. Thus, preci se settinga load to the supporting plate 1 is feasible by mea ns of thedescribed elementsattached orcoupled to each rod 3. The supporting plate 1 can furthercomprise one or morelateral protrusion at an outer side surface. Such a lateralprotrusion can form a further lateral movement limi ter thatextendsinto a corresponding lateralrecessformed in thecoil block body 10. The lateral movement limiter co unteractsan unwanted rotation of the supporting plate 1 rela tive tothe coil block body 10 in the x-y-plane. Additional ly, thelateral movement limiter can counteract an unwantedtranslational movement of the supporting plate 1 al ong the y-direction.Additionally, as shown in Fig. 2, the supporting pl ate 1comprises a protrusion forming a lower movement lim iter 9 atthe bottom surface 22 that extends into an upper re cess 14 ofthe coilblockbody10 formed in the uppersurface 23 ofthecoil block body 10. The lower movement limiter 9 ca n beformed in a centre region atthe bottom surface 22 or alternativelyatoutwardsfrom the centerregion. Additionally,there can be a furtherprotrusion at a lateralside surface and / or the bottom surface 22 of the su pportingplate 1.According to Fig. 2, the supporting plate 1 compris es a T-shape with respect to the illustrated cross section in the y-z-plane with view in the x-direction. The coil bloc k body 10comprises a kind of a U-shape with respect to the i llustratedcross section in the y-z-plane with view in the x-d irectionatthe position ofthe lateralprotrusions16.The supporting P2024,0013 WO N / P230186WO01 November26,2024 -16 -plate 1 comprises lateral plate portions 8 extendin glaterally outwards from the centre region or the pr otrusion 9such that the lateral plate portions 8 each contact s anuppermostsurface oratleastthe uppersurface 23 ofthecoil block body 10 outside the recess 14. According ly, thelateral plate portions 8 can beneficially counterac t anunwanted rotation of the supporting plate 1 relativ e to thecoil block body 10 in the y-z-plane. Thus, the resp ectivelateral plate portion 8 counteract lifting of the o therlateral plate portion 8 on the opposite side from t he coilblockbody10. Asshown in the Figs.1 and 2,the coilblockbody 10 canform a frame in sections around the H-shaped suppor ting plate1. The protruding wall 15 and the lateral protrusio ns 16 fixthe supporting plate 1 at three sides in its assemb ledposition. There can be a further protrusion extendi ng into afurtherrecessatthe outerside aswell.According to the described embodiments, the coil bl ockfixation system 30 can be formed with the followingcomponents: the coil-block body 10, the threaded pi ns or rods3, the spring washers 2, the nuts 5, a locking mech anism,e.g.realized bythe positioning element4 and the weldingseam 17 as well as the rod sleeve 7 and a sliding g uide 27for the washers 2 which can be realized by a furthe r sleevesurrounding the rod 3 such that it is arranged betw een therod 3 and the washers 2 allowing a low-resistance m ovement ofthe washers 2 up and down in z-direction to a certa in extent.Preferably, the positioning element 4 and the slidi ng guide27 are formed from one piece realizing a sliding gu idesupport sleeve allowing vertical translations of th e springwashers 2, so that it can be compressed by vertical vibration P2024,0013 WO N / P230186WO01 November26,2024 -17 -of the coil 19, by vertical thermal dilatation of t he coil 19and during the clamping phase when setting the prop ercompression force on the coil19. The coilblockbody10 itselfcan be composed ofa bulkyinsulating material which is in contact with the co ils 19through rubber pads 20. The coil block body 10 comp rises ashape of an archway through which a screen 18 eleme ntextends. The coil block body 10 embeds also fins fo r theelectrical clearance realizing a creepage structure 25. Onthe top surface or upper surface 23 of the coil blo ck body 10a specific pattern can be made to accommodate a pinsupporting structure realized by the rods 3. The ro ds 3 canhave a standard shape each, e.g. cylindrical. The t hreadedrods 3 are firmly welded on the supporting plate 1,preferably. The screen 18 increasesthe insulation between the coils19.When the voltage between the two coils 19 is relati vely high,a discharge or electrical arc can occur, melting th e anddamaging the coils 19. For such a reason, a minimum distancebetween the coils19 isensured and the higherthe distancethe higher the insulation and the lower the probabi lity ofelectrical arcs. Using the screen 18 allows to incr ease theinsulation between the coils 19 and consequently re duce thedistance between them. This enables setting up more compacttransformers and a smaller external coil 19 and hen ce lessmaterialusage bywhich the costisreduced.The sliding guide 27 for the spring washers 2 is mo unted onthe rods 3 and is vertically free to move up to a g ivenextent. The spring washers 2 are installed around t heassociated sliding guide sleeve 27 and can be verti cally P2024,0013 WO N / P230186WO01 November26,2024 -18 - movable with it.The numberand arrangementofthe describedelements, in particular the spring washers 2, depen d on therequired stiffness and displacement of the assembly and theintended use of the coil block fixation system 30 f or atransformer.The nuts 5 enable fine-tuning the pre-load of the s pringwashers 2 and affect their interaction with the sup portingplate 1 and the coilblockbody10.The respective nut5serves a dual purpose of adjusting the pre-load and securingthe coil block body 10 in place. The positioning el ement 4can be realized as a specific spring element or a r igidmember introduced to prevent the loosening of the r espectivenut5 during excitation,ensuring the integrityof the entire assemblyunderdynamicconditions. Figure 3 showsan embodimentto couple a plurality ofthecoil block fixation systems 30 to a transformer. Th e rods 3of the respective coil block fixation systems 30 ar e coupledwith each other and / or to the transformer or a tran sformertank by means of one or more coupling elements or c ouplingstructures 26 realizing a clamping profile, e.g. U- shapedmetalsupports.The embodiments shown in the figures 1 to 4 as stat edrepresent exemplary embodiments of an improved coil blockfixation system 20 and a corresponding transformer;therefore, they do not constitute a complete list o f allembodiments according to possible arrangements. Act ualarrangements of the fixation system 20 and / or the t ransformermay vary from the embodiments shown in the figures. P2024,0013 WO N / P230186WO01 November26,2024 -19 - Reference Signs 1 supporting plate 2 spring washer 3 rod 4 positioning element 5 nut 7 rod sleeve 8 lateralplate portion 9 lowerprotrusion / movementlimiter 10 coilblockbody 12 upperwallofthe blockbody 13 lateralrecessofthe supporting plate 14 upperrecessofthe blockbody 15 protruding bodywall 16 lateralprotrusion / movementlimiter 17 welding seam 18 screen element 19 coil 20 contactelement 21 uppersurface ofthe supporting plate 22 bottom surface ofthe supporting plate 23 uppersurface ofthe blockbody 24 bottom surface ofthe blockbody 25 creepage structure ofthe blockbody 26 coupling structure 27 sliding guide 30 coilfixing system

Claims

P2024,0013 WO N / P230186WO01 November26,2024 -20 - Claims1. Coil block fixation system (30) for a transforme r,comprising: -a coil block body (10) with a bottom surface (24 ) thatis configured for coupling to a coil (19) of the tr ansformer,- a supporting plate (1) with a bottom surface (22 ) thatis coupled to an upper surface (23) of the coil blo ck body(10) opposite the bottom surface (24) of the coil b lock body(10), -at least two rods (3) that are coupled to an upp ersurface (21) of the supporting plate (1) opposite t he bottomsurface (22) of the supporting plate (1) for settin g a loadto the supporting plate (1)towardsthe coilblock body(10), wherein the supporting plate (1) and the coil bloc k body(10)are formed geometricallyin coordination with each other such thatatleastone ofthe supporting plate (1) and the coilblockbody(10)comprisesatleastone recess (13,14)and the other one of the supporting plate (1) and t he coilblock body (10) comprises at least one protrusion ( 9, 16)that extends into the corresponding recess (13, 14) ofsupporting plate (1) or the coil block body (10) fo rming arespective movement limiter to counteract a transla tionand / or a rotation of the supporting plate (1) relat ive to thecoilblockbody(10), wherein the supporting plate (1)comprisesa firstlateral recess (13) formed at a side surface of thesupporting plate (1) and the coil block body (10) c omprises acorresponding protrusion that forms a lateral movem entlimiter (16) extending into the lateral recess (13) of thesupporting plate (1), wherein the supporting plate (1) comprises a secondlateralrecessformed ata lateralside surface of theP2024,0013 WO N / P230186WO01 November26,2024 -21 -supporting plate (1) opposite the first lateral rec ess (13),and the coilblockbody(10)comprisesa furthercorresponding protrusion that forms a further later almovement limiter (16) extending into the second lat eralrecessofthe supporting plate (1),and wherein the supporting plate (1) comprises an angul arexternal shape including the opposite first end sec ondlateral recesses (13) such that the supporting plat e (1)substantiallycomprisesan H-shape with respectto a top viewonto the upper surface (21) of the supporting plate (1).

2. Coil block fixation system (30) according to cla im 1,wherein the coil block body (10) comprises a protru ding bodywall (15) forming a further lateral movement limite r that isadjacent to an inner edge of the supporting plate ( 1) withrespect to a mounted state of the coil block fixati on systemwhen it is coupled to an annular shaped coil of thetransformer so that the inner edge of the supportin g plate(1)facesthe coil.

3. Coil block fixation system (30) according to any of thepreceding claims,wherein the supporting plate (1) comprisesa protrusion forming a lower movement limiter (9) f ormed atthe bottom surface (22) of the supporting plate (1) extendinginto an upper recess (14) of the coil block body (1 0) formedin the upper surface (23) of the coil block body (1 0).

4. Coil block fixation system (30) according any of thepreceding claims,comprising: at least two spring elements (2), wherein one sprin gelement (2) is coupled to one rod (3) and the other springelement (2) is coupled to the other rod (3) such th at theload set to the supporting plate (1) is provided wi th a givenP2024,0013 WO N / P230186WO01 November26,2024 -22 -flexibility with respect to a mounting direction fr om thecoilblockbody(10)to the rods(3).

5. Coil block fixation system (30) according to cla im 4,wherein the rods (3) are formed as threaded pins ea ch, andwherein the coil block fixation system (30) further comprisesat least two nuts (5) which are configured in coord inationwith the respective associated threaded pin such th at theload set to the supporting plate (1) due to the rod s (3) andthe spring elements (2) is adjustable and fixable b y means ofthe nuts(5)screwed on the threaded pins.

6. Coil block fixation system (30) according to cla im 5,wherein the nuts (5) are screwed on the threaded pi ns suchthat the nuts (5) are arranged between the upper su rface (21)of the supporting plate (1) and the one or more spr ingelements(2).

7. Coil block fixation system (30) according to cla im 5 or6,comprising: at least two positioning elements (4), wherein onepositioning element (4) is coupled to one rod (3) a nd theother positioning element (4) is coupled to the oth er rod (3)such that it is arranged between the associated nut (5) andspring element (2) with respect to a longitudinal d irectionof the corresponding rod (3) and forms a support fo r thespring element (2) and / or a fixing for the adjusted nut (5).

8. Coil block fixation system (30) according to any of thepreceding claims in conjunction with claim 4, where in thespring elements (2) are formed as spring washers su rroundingthe associated rod (3).P2024,0013 WO N / P230186WO01 November26,2024 -23 -9. Coil block fixation system (30) according to any of thepreceding claims in conjunction with claim 4, compr ising:at least two sliding guides (27), wherein one slid ingguide (27)iscoupled to one rod (3)and the other slidingguide (27) is coupled to other rod (3) such that th eassociated spring element(2)isslidable along alongitudinal direction of the rod (3) by means of t he slidingguides(27).

10. Coil block fixation system (30) according to an y of thepreceding claims,wherein the supporting plate (1) comprisesan angular shape with one or more inner and / or oute r edges,and wherein the rods (3) are fixed to the supportin g plate(1) closer to the outer edge of the supporting plat e (1) thanto the inneredge ofthe supporting plate (1)with respecttoa mounted state of the coil block fixation system ( 30)coupled to an annular shaped coil (19) of the trans former,wherein the inneredge ofthe supporting plate (1) facesa centre ofthe coil(19).

11. Coil block fixation system (30) according to an y of thepreceding claims,wherein the supporting plate (1) comprisesa T-shape with respect to a cross section along the mountingdirection with a lower protrusion (9) and lateral p lateportions (8), wherein the lateral plate portions (8 ) extendlaterally outwards from the protrusion (9) and cont act theuppersurface (23)ofthe coilblockbody(10).

12. Transformer,comprising: -a coil(19)forconverting voltage,and -at least one coil block fixation system (30) acc ordingto any of the preceding claims that is coupled to t he coil(19).

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