EP2487696B1 - Électrode écran et bac à huile - Google Patents

Électrode écran et bac à huile Download PDF

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Publication number
EP2487696B1
EP2487696B1 EP12002231.4A EP12002231A EP2487696B1 EP 2487696 B1 EP2487696 B1 EP 2487696B1 EP 12002231 A EP12002231 A EP 12002231A EP 2487696 B1 EP2487696 B1 EP 2487696B1
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EP
European Patent Office
Prior art keywords
shielding element
layer
element according
shielding
corrugated
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.)
Not-in-force
Application number
EP12002231.4A
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German (de)
English (en)
Other versions
EP2487696A1 (fr
Inventor
Hartmut Brendel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Technology AG
Original Assignee
ABB Technology AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ABB Technology AG filed Critical ABB Technology AG
Priority to EP12002231.4A priority Critical patent/EP2487696B1/fr
Publication of EP2487696A1 publication Critical patent/EP2487696A1/fr
Application granted granted Critical
Publication of EP2487696B1 publication Critical patent/EP2487696B1/fr
Priority to HRP20140546AT priority patent/HRP20140546T1/hr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • 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
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling

Definitions

  • the invention relates to a shielding element, comprising at least a first and a second thereto adjacent layer of a mechanically strong, flat first insulating material, wherein the first and the second layer insulating material with a third interposed, corrugated layer of a mechanically strong, flat, second insulating material are connected and spaced, whereby an insulating element is then formed, and wherein the third layer has lateral edges and is corrugated such that all cavities formed by the corrugated shape are flooded completely over the lateral edges with a liquid.
  • high-voltage transformers or high-voltage chokes for example, with a rated voltage of 220kV, 380kV or 800kV, a rated power of> 100MVA and a weight of 200t or higher, for insulation and cooling purposes usually arranged in an oil-filled transformer tank with the oil serving both insulation and improved cooling.
  • the distance of the high-voltage transformer from the inner wall of the oil tank is essentially due to isolation-technical aspects, ie ultimately the distance of a potential-affected area to a grounded or another potential-charged area and the geometric shape of the components to be isolated from each other.
  • a minimum isolation distance may be required be required, which makes the oil boiler unnecessarily large or which is not available at all.
  • the minimum insulation distance depends both on the geometric shape of the voltage-carrying components but also on the geometric shape of the grounded components, in particular of the oil boiler.
  • sharp edges are always known to be disadvantageous because around them in operation of the transformer, an increased field strength occurs, which in turn favors breakdowns or structurally greater distances required to avoid breakdowns. This will make a transformer unnecessarily large.
  • Such edges are given, for example, in the interior of the boiler in the region of Austechnischtechnischsdomen, where by two perpendicular to each other welded wall plates in the interior of the boiler protruding edge can be formed with a 90 degree angle.
  • the object of the invention is also to provide a compact oil boiler with improved shielding of the inner edges.
  • a screen element of the aforementioned type This is characterized in that the insulation element has two planar side regions, which are angled along a bending edge to each other, and that there is a curved central region between them.
  • the basic idea of the invention is to cover the critical boiler areas with a geometrically induced high field strength with a screen element or an insulation element, which is suitable for a higher insulation technology Field strength is designed.
  • the basic structure of the screen element or insulation element according to the invention is designed for a precisely increased field strength loading.
  • a purely solid insulating material running path follows in sections of the waveform of the third layer in a screen element or insulation element according to the invention and is therefore obliquely and compared to the shortest path along a surface normal correspondingly longer, so that in this respect also results in improved isolation.
  • the shield element or insulation element rests positively in its central bending region on the edge region to be electrically shielded in order to avoid spaces filled with oil between the shield element or insulation element and edge region, in which case an admissible field strength would possibly be exceeded ,
  • a prerequisite for an inventive insulation capability of a screen element or insulation element in operation is that the cavities are completely flooded with oil and air pockets are avoided.
  • all cavities are to be designed so that they are floodable at least from one, preferably from two sides.
  • another suitable liquid insulating agent instead of the proven liquid insulating agent oil.
  • Flooding of a screen element or insulation element with oil takes place through its open side edges, into which the cavities formed by the corrugated third layer open, so to speak, as channels. If possible, therefore, a screen element or insulation element is to be arranged within an oil boiler such that the channels formed by the cavities extend in the vertical direction, ie from bottom to top.
  • the curved central region encloses the bending edge in a droplet-like manner.
  • sharp edges are in turn avoided by the form-fitting located below the shield element to be screened edge region, so that combines the effect of avoiding sharp edges with the inventive increase in the field strength load in an advantageous manner.
  • an edge region to be screened inside a oil boiler has a drop-like shape, but rather, for example, it is assumed that there is a welded edge, which has possibly been smoothed. It is therefore provided according to a further embodiment of the invention that the bending edge facing side of the screen element or insulation element at least in his bent center region is connected to a form-fitting corresponding sheet-like shield electrode made of an electrically conductive material. Insulation element and shield electrode then form a screen element in the true sense. Due to the sheet-like configuration, a shielding electrode can be easily brought into a drop-like manner enclosing the edge that is actually to be screened.
  • the drop-like shape is particularly suitable for avoiding low bending radii, which prove to be unfavorable with respect to a field strength that occurs in operation.
  • the drop-like shape protrudes slightly with the screen element mounted into the interior of the oil boiler. However, this is unavoidable if a sustainable processing of the edge, for example by milling the corner area, should be avoided.
  • the permissible bending radii of the shielding electrode can be reduced by supporting a shielding element made of insulating material so that the shielding element enclosing the edge to be shielded protrudes less into the interior of the vessel and the boiler region in question can ultimately be made smaller.
  • a boiler area is, for example, a discharge dome for high-voltage discharges in the voltage range of 800 kV, which can be reduced by more than 200 mm in width due to the measures mentioned in the width.
  • the connection is screwed to the shield electrode, wherein for this purpose screw means are to be used from an electrically non-conductive insulating material.
  • screw means are to be used from an electrically non-conductive insulating material.
  • a screw connection is suitable in a particularly simple manner for the subsequent mounting of shielding elements in an edge region of an oil tank to be screened. It is further advantageously avoided that a larger gap forms in the area of surface contact of the components of the shielding element, which would prove to be field strength critical.
  • these are made of an insulating material, for example pressed chip. Ideally, by a correspondingly rounded configuration of the outer regions of the screw means also sharp-edged areas are avoided.
  • the screw connections are provided in the middle region surrounding the bending edge like a drop. This stands out from the edge region to be screened, so that a gap is formed in some areas between the shield electrode and the edge region. This is not critical field strength, because both components are electrically connected to each other and thus at the same electrical potential.
  • this gap region is suitable for placing, for example, a nut between shield electrode and edge region, which then serves as a counterpart for a screw, with which the components of the shield element are held together.
  • the third layer is at least partially corrugated trapezoidal.
  • This offers an improved planar connection possibility of the plateaus formed by the trapezoidal shape of the third corrugated layer with the adjacent planar first and second layers, which also has a positive effect on the insulating ability of the shielding element or insulation element.
  • the mechanical stability is advantageously increased by the now approximately straight strut shape of the trapezoidal sides between the first and second layer.
  • the first insulating material corresponds to the second insulating material, apart from the waveform.
  • the production of a screen element is simplified. Differences in the insulating material could be based, for example, in its thickness, for example 1 mm to 4 mm, or in its flexibility, wherein pressboard variants are each a preferred embodiment.
  • the height of the cavities formed by the corrugated shape corresponds to at least twice the thickness of the non-corrugated second insulation material, wherein a four- or six-fold thickness may well be suitable.
  • the insulation module forms a barrier system which, due to its dimensional stability, also bears directly on the component to be insulated or shielded, even after thermal and vacuum-technical processes.
  • the cavities extend parallel to the bending edge. This is a preferential bending direction of the multilayer insulation component of the solid insulation material, so that a particularly simple shape adaptation in the bent central region is made possible here.
  • adjacent layers of the solid insulating material are connected to one another by means of a high-voltage-resistant adhesive.
  • a suitable bonding agent is an adhesive such as casein.
  • the shielding element according to the invention all cavities formed by the corrugated shape are completely flooded with oil. Its desired isolation capability reaches a screen element or insulation element according to the invention namely only when all the cavities are filled with oil or other suitable liquid insulation means.
  • At least partial regions of the insulating element and / or shielding electrode are coated with a layer of insulating varnish.
  • a suitable layer thickness is, for example, in a range between 100 ⁇ m and 300 ⁇ m.
  • an oil boiler for arranging a high voltage electrical component therein, in particular a transformer, wherein at least two planar mutually angled adjacent wall portions are provided of an electrically conductive material, which form an obtuse angle to each other along a common bending edge in the boiler interior, wherein a screen element according to one of claims 1 to 12 is mounted positively on the bending edge at least in sections, and wherein the bending edge extends approximately congruent with the bending edge.
  • At least one shielding element is welded with its shield electrode to the wall elements.
  • the welding allows a secure connection of the shield electrode with the relevant wall sections of the oil boiler.
  • a field strength technically uncritical gap between the shield electrode and to be screened edges of the wall in which then, for example, nuts can be placed by a screw, with which then fixes the multilayer insulation component of solid insulation material can be.
  • Nuts and screws or the like are also made of an insulating material.
  • Fig. 1 shows an exemplary first screen element 10 in a sectional view, which could also be referred to as an insulating element without shield electrode.
  • This has a first 12, a second 14 and an intermediate corrugated layer of a sheet-like insulating material.
  • the conditional by the waveform of the intermediate layer cavities are flooded during operation of the screen element with oil or the like, so that there is a very high field strength.
  • the shield element 10 is intended to shield a 90 ° edge in the interior of an oil boiler. Therefore, two flat side portions 18, 22 are provided, which are also at a 90 ° angle to each other and which connect flat to an imaginary to be screened edge region.
  • a curved central region 20 is provided, which surrounds the 90 ° edge region in a drop-shaped manner.
  • curved central region 20 sharp edges are avoided in an advantageous manner. So this one points a symmetrical V-like shape whose rear portion has a circular segment-like cross-section whose center is denoted by the reference numeral 24.
  • Reference numeral 16 represents a bending edge which marks the intersection of the elongated planar side regions 18, 22 and ultimately represents the position of the sharp edge to be screened. Therefore, in the assembled state of the shielding element 10, the bending edge 16 and the edge to be shielded are generally congruent.
  • Fig. 2 shows an exemplary second shielding element 30 in oil.
  • a first planar layer 32 of a first insulating material is connected at a plurality of connection points, one of which is designated by the reference numeral 46, with a third corrugated layer 36 of a second insulating material.
  • the other side of the third corrugated layer 36 is connected to a second planar layer 34 of a first insulating material at further connection points 48, so that between the flat layers 32, 34 and the corrugated layer 36 cavities 42, 44 are formed, which in FIG. are indicated as filled with oil 50.
  • These are open at the lateral edges of the screen element and have a channel-like shape. This ensures that each channel via the lateral edges with a liquid insulation medium, in this example oil 50, is floatable.
  • a screen element only has its full electrical insulation capability if all the cavities 42, 44 are completely filled with a corresponding liquid insulation medium and no air-filled areas are left.
  • material variants of pressboard or another stable pulp material are suitable as insulation materials, wherein the thickness of a respective first or second layer may be, for example, 2 mm to 5 mm and the thickness of a corrugated third layer, for example 5 mm to 20 mm, the latter value consisting of an actual material thickness 38 and a height 40 of a respective cavity 42, 44 composed.
  • Fig. 3 shows an exemplary sheet-like shielding electrode 60 in a side sectional view.
  • the electrode is made of an electrically conductive metal, has a V-like cross-section at an opening angle of about 70 ° and is as a positive corresponding to that in the Fig. 1 shown bent central region 20 assume.
  • the edges at the ends 66, 68 of the shield electrode are flattened in order to fit as form-fitting as possible on a corner area to be shielded in the interior of an oil boiler.
  • a welded connection with a boiler wall preferably takes place at the ends 66, 68 of the screening electrode 60, for example by means of fewer spot welding connections.
  • Fig. 4 shows an exemplary third screen element with screwed shield electrode and a component of multilayer insulation material in a three-dimensional view 70.
  • a bent center region 76 of the shield element has a shield electrode which is fastened by means of fixing strips 74 and screw 72.
  • Fixing strips 74 and screw 72 are made of an insulating material, for example of a pressboard-like material.
  • the arrangement of a screen electrode on the screen element 70 is usually to be regarded as a rule, because thus the shape of an edge to be screened is almost negligible, since it is then covered by the screen electrode.
  • the edge to be shielded has, for example, the shape of a 90 ° rounding, which is improved by attaching a shielding element without shielding electrode to a higher field strength.
  • Fig. 5 shows an exemplary oil pan with screen element in a representation 80.
  • An exemplary screen element 82 with multilayer insulation component and screen electrode is arranged around two planar mutually angled adjacent wall portions 90, 92 of an oil boiler.
  • Shield electrode and multi-layer insulation component are connected to each other by means of screw means 86 and fixing strips 84, as for a detail area 88 in the Fig. 6 shown in detail below.
  • the shield electrode is selectively connected at its outer ends by means of a welded connection to the wall regions 90, 92.
  • Such wall regions 90, 92 are, for example, in the region of a discharge dome provided, which in this example in the interior of the boiler at a 90 ° angle along a bending edge 94 abut each other.
  • Fig. 6 shows a detail portion 100 of a screw, which in the Fig. 5 shown by the reference numeral 88.
  • a sheet-like shielding electrode 110 is flatly adjacent to a multi-layered insulation component of the shielding element, which in turn has a first planar layer 102, a second layer 104 and, in between, a third corrugated layer 106 insulating material.
  • the waveform of the third layer 106 cavities 108 are formed, which are flooded with the arrangement of the shield element in the oil tank with oil or other insulation material.
  • Sheet-like shield electrode 110 and multi-layer insulation component are screwed against each other by means of a screw 112 and two nuts 114, 116 and a fixing strip 118.
  • the shield electrode 110 is usually welded at its outer edges to the boiler wall.
  • Fig. 7 shows an exemplary nut 120 with a threaded hole 124 in a plan view 122 and in a side view 126.
  • a nut is made of an insulating material such as pressboard while avoiding sharp-edged areas.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Treatment Of Sludge (AREA)
  • Discharge Heating (AREA)

Claims (15)

  1. Élément écran (10, 30, 70, 82) comprenant au moins une première couche (12, 32, 102) et une deuxième couche (14, 34, 104) adjacente à celle-ci en un premier matériau isolant plat résistant mécaniquement, la première couche (12, 32, 102) et la deuxième, couche (14, 34, 104) de matériau isolant étant connectées à, et espacées par, une troisième couche ondulée (36, 106) disposée entre elles en un deuxième matériau isolant plat résistant mécaniquement, en formant ainsi un élément isolant, et la troisième couche (36, 106) présentant des arêtes latérales et étant ondulée de telle sorte que toutes les cavités (42, 44, 108) formées par la forme ondulée puissent être complètement remplies d'un liquide (50) par-dessus les arêtes latérales,
    caractérisé en ce que
    l'élément isolant présente deux régions latérales planes (18, 22) qui sont coudées l'une par rapport à l'autre le long d'une arête de courbure (16, 94) et en ce qu'une région centrale courbée (20) est prévue entre celles-ci.
  2. Élément écran selon la revendication 1, caractérisé en ce que la région centrale courbée (20) entoure l'arête de courbure (16, 94) en forme de goutte.
  3. Élément écran selon l'une quelconque des revendications 1 et 2, caractérisé en ce que le côté de l'élément écran tourné vers l'arête de courbure (16, 94) est connecté (100) au moins dans sa région centrale courbée (20) à une électrode écran (60, 110) de type tôle à correspondance géométrique constituée d'un matériau électriquement conducteur.
  4. Élément écran selon la revendication 3, caractérisé en ce que la connexion (100) est vissée à l'électrode écran (60, 110) et en ce que l'on utilise pour cela des moyens filetés (72, 86, 112, 114, 116, 120) constitués d'un matériau isolant non conducteur de l'électricité.
  5. Élément écran selon la revendication 4, caractérisé en ce que l'on évite des régions à arêtes vives dans les moyens filetés (72, 86, 112, 114, 116, 120).
  6. Élément écran selon l'une quelconque des revendications 4 et 5, caractérisé en ce que la connexion vissée (100) est prévue dans la région centrale (20) entourant l'arête de courbure (16, 94) en forme de goutte.
  7. Élément écran selon l'une quelconque des revendications précédentes, caractérisé en ce que la troisième couche (36, 106) est au moins en partie ondulée sous forme trapézoïdale.
  8. Élément écran selon l'une quelconque des revendications précédentes, caractérisé en ce que le premier matériau isolant correspond au deuxième matériau isolant.
  9. Élément écran selon l'une quelconque des revendications précédentes, caractérisé en ce que la hauteur (40) des cavités (42, 44, 108) formées par la forme ondulée correspond au moins au double de l'épaisseur (38) du deuxième matériau isolant ondulé.
  10. Élément écran selon l'une quelconque des revendications précédentes, caractérisé en ce que les cavités (42, 44, 108) s'étendent parallèlement à l'arête de courbure (16, 94).
  11. Élément écran selon l'une quelconque des revendications précédentes, caractérisé en ce que des couches adjacentes (12, 14, 32, 34, 36, 102, 104, 106) sont connectées les unes aux autres au moyen d'un adhésif résistant aux fortes contraintes.
  12. Élément écran selon l'une quelconque des revendications précédentes, caractérisé en ce que toutes les cavités (42, 44, 108) formées par la forme ondulée sont complètement remplies d'huile (50).
  13. Élément écran selon l'une quelconque des revendications précédentes, caractérisé en ce qu'au moins des régions partielles de l'élément isolant et/ou de l'électrode écran sont recouvertes d'une couche de vernis isolant.
  14. Carter d'huile (80) devant recevoir un composant haute tension électrique, en particulier un transformateur, au moins deux régions de paroi planes adjacentes coudées l'une par rapport à l'autre (90, 92) en matériau électriquement conducteur étant prévues, lesquelles forment ensemble un angle obtus le long d'une arête de pliage commune (94) à l'intérieur du carter,
    caractérisé en ce
    qu'un élément écran (10, 30, 70, 82) selon l'une quelconque des revendications 1 à 13 est monté par correspondance de forme au moins en partie sur l'arête de pliage (94) et en ce que l'arête de courbure (94) s'étend de manière approximativement congruente avec l'arête de pliage (16, 94).
  15. Carter d'huile selon la revendication 14, caractérisé en ce qu'au moins un élément écran (10, 30, 70, 82) est soudé avec son électrode écran (60, 110) sur les éléments de paroi.
EP12002231.4A 2012-03-28 2012-03-28 Électrode écran et bac à huile Not-in-force EP2487696B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12002231.4A EP2487696B1 (fr) 2012-03-28 2012-03-28 Électrode écran et bac à huile
HRP20140546AT HRP20140546T1 (hr) 2012-03-28 2014-06-10 Zaštitna elektroda i uljni bojler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12002231.4A EP2487696B1 (fr) 2012-03-28 2012-03-28 Électrode écran et bac à huile

Publications (2)

Publication Number Publication Date
EP2487696A1 EP2487696A1 (fr) 2012-08-15
EP2487696B1 true EP2487696B1 (fr) 2014-03-12

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EP12002231.4A Not-in-force EP2487696B1 (fr) 2012-03-28 2012-03-28 Électrode écran et bac à huile

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HR (1) HRP20140546T1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2816575B1 (fr) * 2013-06-18 2015-12-09 ABB Technology AG Ossature de commutation de transformateur à huile

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1743109A (en) * 1926-11-19 1930-01-14 Westinghouse Electric & Mfg Co Tank structure
US6294729B1 (en) * 1997-10-31 2001-09-25 Laird Technologies Clad polymer EMI shield
DE102006013927B4 (de) * 2006-03-21 2008-11-20 Siemens Ag Verbindungselement für eine elektrische Abschirmungsanordnung
ATE552599T1 (de) * 2009-08-19 2012-04-15 Abb Technology Ag Ausleitungsrohr

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HRP20140546T1 (hr) 2014-09-12

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