Coil block fixation system for a transformer and transformer with said system

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) opposite 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 coil block fixation system (30) further comprises two or more spring elements (2) one of which is coupled to the associated rod (3) such that the load set to the supporting plate (1) is provided with a given flexibility with respect to a mounting direction from the coil block body (10) to the rods (3).

Description

[0001] P2024,0012 WO N / P230206WO01 November21,2024 -1 - DescriptionCoil block fixation system for a transformer and tr ansformerThe 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. P2024,0012 WO N / P230206WO01 November21,2024 -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 he coilblock fixation system further comprises at least tw o springelements. At least one spring element is coupled to each rodsuch that each rod interacts with at least one spri ng elementand such thatthe load setto the supporting plate isprovided with a given flexibility with respect to a mountingdirection from the coilblockbodyto the rods.By use of the described fixation system a transform er isfeasible and enables to withstand accelerations due to highloadsduring operation,transportation and others. Thefixation system provides a specific configuration t hatcombines an advantageous compromise between high st abilityand flexibility of the transformer in view of movem ents thatare unavoidable.According to a further embodiment, the supporting p latecomprisesone ormore protrusionsthatextend intocorresponding one or more recesses of the coil bloc k body andthat form a respective movement limiter to countera ct atranslation and / or a rotation of the supporting pla terelative to the coil block body. For example, the s upporting P2024,0012 WO N / P230206WO01 November21,2024 -3 -plate comprises a lateral movement limiter formed a t a sidesurface of the supporting plate extending into a la teralrecess of the coil block body formed in an upper su rface orwallofthe coilblockbody.In particular,such a lateralmovement limiter can reliably counteract an unwante d rotationofthe supporting plate around an axisofrotation which maybe parallel to a longitudinal axis of the elongated rodsubstantially. Additionally, such a lateral movemen t limitercan counteractan unwanted translation in directed limited by a recesscontourofthe coilblockbody.Alternatively or additionally, the supporting plate comprisesa lower movement limiter formed at the bottom surfa ce of thesupporting plate extending into an upperrecessof the coil blockbodyformed in the uppersurface ofthe coil block body.In particular,such a lowermovementlimiter can reliablycounteractan unwanted translation ofthe supportingplate in a plane substantially perpendicular to theaforementioned axis of rotation. Additionally, such a lowermovement limiter can counteract an unwanted rotatio n in theaforementioned plane and also in a transverse plane to it.The one or more protrusions forming limiters can be formed inone piece with the supporting plate, in particular.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 the P2024,0012 WO N / P230206WO01 November21,2024 -4 -upper 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 eachrod such that it is arranged between the associated nut andspring element with respect to a longitudinal direc tion ofthe corresponding rod. The positioning element form s asupport for the one or more spring elements attache d to theassociated rod.Additionallyoralternatively,thepositioning element can form a fixing for the adjus ted nutconfigured to prevent loosening of the set nut posi tioningand load to the supporting plate.According to a further embodiment, the spring eleme nts areformed as spring washers surrounding the associated rod. Thespring washers can be realize in a cost-saving mann er 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 realized as res pectivesleeves which surround the associated rod. Such sle eves wouldbe arranged between the rod and the spring washer t o provideguided and low-resistance sliding up and down along thelongitudinal axis of the corresponding rod. The sli dingguider can be formed in one piece with the position ing P2024,0012 WO N / P230206WO01 November21,2024 -5 -element described above forming a sleeve with a dis c-likesupport surface which could comprise a kind of T-sh aped tubewith respectto a crosssection.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 arespectively 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.According to a further embodiment, the supporting p latecomprises an angular shape with one or more inner a nd / or P2024,0012 WO N / P230206WO01 November21,2024 -6 -outer edges. For example, the supporting plate comp rises asubstantially rectangular or cuboid shape with roun ded edges,preferably. Alternatively, the supporting plate can comprisea trapezoidal shape or a triangular, a pentagonal o rpolygonal shape with sharp and / or rounded edges. Th e rods arefixed to the supporting plate closer to the outer e dge of thesupporting plate than to the inner edge of the supp ortingplate with respect to a mounted state of the coil b lockfixation system coupled to an annular shaped coil o f thetransformer, wherein the inner edge of the supporti ng platefacesa centre ofthe coil.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 extends later allyoutwards 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 anted P2024,0012 WO N / P230206WO01 November21,2024 -7 -rotation around an axis of rotation which may be pa rallel toa main extension plane orto the extrusion axisof the supporting plate.According to a further embodiment, the coil block b ody cancomprise atleastone protrusion thatextendsinto acorresponding recess of the supporting plate and th at forms arespective movement limiter to counteract a transla tionand / ora rotation ofthe supporting plate relative to thecoil block body. Such a configuration can also bene ficiallycounteractan unwanted translation and / orrotation ofthe supporting plate relative to the coilblockbody.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 ckfixation 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 uency P2024,0012 WO N / P230206WO01 November21,2024 -8 - requirementswhich 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 weaknesseshighlights the need for a more robust coil-block de signcapable of withstanding the demanding conditions sp ecified bythe customertesting requirements.The described coil block fixation system can counte ract theaforementioned adverse effects and shortcomings. Th e coilblock fixation system can be realized as squared sh apedflange fixation that allows for stable and reliable operationof the transformer in particular in view of shock a nd sinebeat load requirements due to its spring washers an d thespecific design options which contribute to an enha ncedoverallrobustness.The rods and associated spring elements in interact ion withthe specific supporting plate and coil block body a respecifically engineered to withstand high accelerat ionshocks. Integrated in or attached to a transformer, the coil P2024,0012 WO N / P230206WO01 November21,2024 -9 -block fixation system can contribute to prevent str ucturaldamages and performance issues under extreme loadin gcondition. The spring elements, preferably formed a s springwashers,can reliablyabsorb thermaldilatation of a windingor coil of the transformer while maintaining benefi cialstiffness, specifically tuned, to withstand dynamic loads.Thus, an overall resilience and performance of tran sformerscan be improved even in view of high acceleration s hocks. Thedescribed configurations of the coil block fixation systemeach representsa compromise between the necessity forhavinga stiff coil-block to support the windings or coils of thetransformerbeing subjectto extreme loadsand,at the sametime, providing a sufficient room for the thermal e xpansionof the windings or coils. The coil block body may c omprise abulky structure itself with some protrusions and / or recessesthat serve as interface for the supporting plate an d theassembled rods and spring washers. The rods form pi ns throughwhich a proper pre-load on the coils of the transfo rmer canbe applied. The combination of the preload and spri ngwashers' stiffness can advantageously contribute to requiredstabilityand 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. P2024,0012 WO N / P230206WO01 November21,2024 -10 -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 foran transformerin a perspective view,Figure 2 a cross section side view of components of the coilblockfixation system offigure 1,Figure 3 a further embodiment of the coil block fix ationsystem fora transformerin a perspective view,Figure 4 a cross section side view of components of the coilblockfixation system offigure 3,andFigure 5 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 theirfunction 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 the P2024,0012 WO N / P230206WO01 November21,2024 -11 -bottom 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 coil block fixation system 30 further compr ises tworods3 thatare coupled to the uppersurface 21 of thesupporting plate for setting a load to the supporti ng platetowards the coil block body. The rods 3 can be secu rely fixedto the supporting plate 1 bymeansofwelding.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,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 upper P2024,0012 WO N / P230206WO01 November21,2024 -12 -surface 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 2only for better illustration). The positioning elem ent 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 tosurround a respective portion of the rod 3 that ext endsthrough a coupling structure 26 ofthe transformer (see Fig.5). The sleeve 7 is fixed to the coupling structure 26 bymeans ofthe welding seam 17 and limitsan allowed movementof the washers 2 in z-direction and realize a stabl e movementguidance of the rods 3 and the corresponding coil b lockfixation system 30 in interaction with the coupling structure26 ofthe transformer.The rod sleeve 7 limitsthe associatedrod 3 and the positioning element 4 tilting while s tillleaving their translation in vertical direction fre e. Thus,precise setting a load to the supporting plate 1 is feasibleby means of the described elements attached or coup led toeach rod 3.The supporting plate 1 comprises a substantially re ctangularshape with rounded edges and a lateral protrusion a t an outerside surface. The lateral protrusion forms a latera l movementlimiter 6 that extends into a lateral recess 11 for med in anupper wall 12 of the coil block body 10. The latera l movementlimiter 6 counteracts an unwanted rotation of the s upporting P2024,0012 WO N / P230206WO01 November21,2024 -13 -plate 1 relative to the coil block body 10 in the x -y-plane.Additionally, the lateral movement limiter 6 can co unteractan unwanted translational movement of the supportin g plate 1along 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 supportin g plate 1comprises lateral plate portions 8 extending latera llyoutwards from the centre region or the protrusion 9 such thatthe lateral plate portions 8 each contacts an upper mostsurface or at least the upper surface 23 of the coi l blockbody 10 outside the recess 14. Accordingly, the lat eral plateportions8 can beneficiallycounteractan unwanted rotationof the supporting plate 1 relative to the coil bloc k body 10in the y-z-plane. Thus, the respective lateral plat e portion8 counteract lifting of the other lateral plate por tion 8 onthe opposite side from the coilblockbody10.Figure 3 illustrates a further embodiment of the co il blockfixation system 30. The supporting plate 1 comprise s atrapezoidal shape in the x-y-plane tapering in dire ction of P2024,0012 WO N / P230206WO01 November21,2024 -14 -the centre of the coils 19. On the wider side porti on of thesupporting plate 1 there are two rods 3 attached, e .g.welded, onto the upper surface 21 of the supporting plate 1.Approximately in a middle of the supporting plate 1 there isa further rod 3 attached, e.g. welded, onto the upp er surface21 of the supporting plate 1. Thus, the illustratedembodiment according to the Figs. 3 and 4 comprises threerods 3 which set up three local loads on the suppor ting plate1.Figure 4 showsa corresponding crosssection of theembodiment according to Fig. 3 in the y-z-plane wit h view inthe x-direction. The coil block body 10 can further comprisea circumferential protruding outer wall forming a k ind of aframe surrounding a lower portion of the supporting plate 1which can further counteract an unwanted translatio nal and / orrotational movement of the supporting plate 1 relat ive to thecoilblockbody10.The three rods 3 will all comprise washers 2 and nu ts 5 asalready described in view of the embodiment accordi ng to theFigs. 1 and 2. The three threaded rods 3 and flexib le localloadsto the supporting plate 1 due to the washers 2 and nuts5 can beneficially affect the stability and flexibi lity ofthe coil block fixation system 30 and the correspon dingtransformer. The three rods 3 and the corresponding springwashers 2 and nuts 5 can provide equal or different localloads to the supporting plate 1 which sum up to a g iven totalload on the supporting plate 1.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 welding P2024,0012 WO N / P230206WO01 November21,2024 -15 -seam 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 vibrationof 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 the P2024,0012 WO N / P230206WO01 November21,2024 -16 -insulation 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 callymovable 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 5 showsan embodimentto couple a plurality ofthecoil block fixation system 30 to a transformer. The rods 3 ofthe respective coil block fixation systems 30 are c oupledwith 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. P2024,0012 WO N / P230206WO01 November21,2024 -17 -The embodiments shown in the figures 1 to 5 as stat edrepresent exemplary embodiments of an improved coil blockfixation systems 30 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.

[0002] P2024,0012 WO N / P230206WO01 November21,2024 -18 - Reference Signs 1 supporting plate 2 spring washer 3 rod 4 positioning element 5 nut 6 lateralmovementlimiter 7 fixation sleeve 8 lateralplate portion 9 lowermovementlimiter 10 coilblockbody 11 lateralrecessofthe blockbody 12 upperwallofthe blockbody 14 upperrecessofthe blockbody 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

P2024,0012 WO N / P230206WO01 November21,2024 -19 - 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), and -at least two spring elements (2), one coupled to onerod (3)and the othercoupled to the otherrod (3) such thatthe load set to the supporting plate (1) is provide d with agiven flexibility with respect to a mounting direct ion fromthe coilblockbody(10)to the rods(3).

2. Coil block fixation system (30) according to cla im 1,wherein the supporting plate (1) comprises at least oneprotrusion (6, 9) that extends into a corresponding recess(11, 14) of the coil block body (10) and that forms arespective movement limiter to counteract a transla tionand / or a rotation of the supporting plate (1) relat ive to thecoilblockbody(10).

3. Coil block fixation system (30) according to cla im 2,wherein the supporting plate (1) comprises a latera l movementlimiter (6) formed at a side surface of the support ing plate(1) extending into a lateral recess (11) of the coi l blockP2024,0012 WO N / P230206WO01 November21,2024 -20 - body(10)formed in an upperwall(12)ofthe coil blockbody (10).

4. Coil block fixation system (30) according to cla im 2 or3, wherein the supporting plate (1) comprises a low ermovement limiter (9) formed at the bottom surface ( 22) of thesupporting plate (1) extending into an upper recess (14) ofthe coil block body (10) formed in the upper surfac e (23) ofthe coilblockbody(10).

5. Coil block fixation system (30) according to any of thepreceding claims, wherein the rods (3) are formed a s threadedpins each, and wherein the coil block fixation syst em (30)further comprises at least two nuts (5) which are c onfiguredin coordination with the respective associated thre aded pinsuch thatthe load setto the supporting plate (1) due to the rods(3)and the spring elements(2)isadjustable andfixable by means of the nuts (5) screwed on the thr eadedpins.

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), one coupled toone rod (3)and the otherone coupled to the other rod (3)such that it is arranged between the associated nut (5) andspring element (2) with respect to a longitudinal d irectionP2024,0012 WO N / P230206WO01 November21,2024 -21 -of 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, wherein the spring elements (2) a re formedas spring washers surrounding the associated rod (3 ).

9. Coil block fixation system (30) according to any of thepreceding claims,comprising: at least two sliding guides (27), one coupled to o ne rod(3)and the otherone coupled to the otherrod (3) such thatthe associated spring element (2) is slidable 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,comprising: -three or more rods (3) that are coupled to the up persurface (21) of the supporting plate (1) for settin g a loadto the supporting plate (1)towardsthe coilblock body(10), and -three ormore spring elements(2),wherein onerespective spring element (2) is coupled to one ass ociatedrod (3) such that each rod (3) provides a respectiv e load tothe supporting plate (1)with a respectivelygivenflexibility along the mounting direction from the c oil blockbody(10)to the rods(3).

11. 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) thanP2024,0012 WO N / P230206WO01 November21,2024 -22 - to 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.

12. 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).

13. Coil block fixation system (30) according any o f thepreceding claims,wherein the coilblockbody(10) comprisesat least one protrusion that extends into a corresp ondingrecess of the supporting plate (1) and that forms arespective movement limiter to counteract a transla tionand / or a rotation of the supporting plate (1) relat ive to thecoilblockbody(10).

14. 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).

Images