EP2490230A2 - Baguette de support d'isolation - Google Patents

Baguette de support d'isolation Download PDF

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Publication number
EP2490230A2
EP2490230A2 EP12002539A EP12002539A EP2490230A2 EP 2490230 A2 EP2490230 A2 EP 2490230A2 EP 12002539 A EP12002539 A EP 12002539A EP 12002539 A EP12002539 A EP 12002539A EP 2490230 A2 EP2490230 A2 EP 2490230A2
Authority
EP
European Patent Office
Prior art keywords
insulation
strip
strip according
module
insulating
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.)
Granted
Application number
EP12002539A
Other languages
German (de)
English (en)
Other versions
EP2490230A3 (fr
EP2490230B1 (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 EP20120002539 priority Critical patent/EP2490230B1/fr
Publication of EP2490230A2 publication Critical patent/EP2490230A2/fr
Publication of EP2490230A3 publication Critical patent/EP2490230A3/fr
Application granted granted Critical
Publication of EP2490230B1 publication Critical patent/EP2490230B1/fr
Priority to HRP20140868AT priority patent/HRP20140868T1/hr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/28Coils; Windings; Conductive connections
    • H01F27/32Insulating of coils, windings, or parts thereof
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/02Casings
    • H01F27/04Leading of conductors or axles through casings, e.g. for tap-changing arrangements

Definitions

  • the invention relates to an insulation strip, comprising a beam-like base module with preferably a rectangular-like cross section of a solid insulating material and at least one of its two ends provided fastening means.
  • the invention also relates to an insulating truss and an oil transformer with inventive insulation strip.
  • transformers having a rated power of 100 MVA and higher at a rated voltage of 110 kV and higher, for example also 800 kV are usually designed as oil transformers having a weight of 200 t and higher.
  • the active part of the transformer with iron core and windings is arranged inside a transformer vessel filled with oil, the oil serving both the electrical insulation and the improved cooling.
  • the electrical connection of the respective terminals of the active part of the transformer with the Aus effetsisolatoren on the outside of the oil boiler takes place here by electrical conductors which are surrounded at high voltages by a lying at the same potential, insulated shield tube, the isolation of either solid insulating materials or of a barrier system is formed.
  • the barrier system is constructed radially symmetrical about the respective conductor and comprises an electrically conductive screen tube with, if necessary, a plurality of nested spaced isolation barriers.
  • the barrier systems required for each individual conductor are located inside the oil-filled transformer tank passed through a gap formed between the transformer and boiler wall, but isolation-related minimum distances must be adhered to.
  • the insulated shield tubes and the other diversion components are to be supported or held at specific intervals, ie mechanically connected to, for example, the outer wall of the boiler or a suitable region of the transformer or supported by a support frame.
  • support strips are used, among other things, which are to be made of an electrically insulating material. These are usually tubular support elements made of a plastic, which are connected to each other by means of respective - optionally articulated - connecting elements.
  • the insulating ability of a support strip as such is less than the insulating ability of pure oil with identical isolation distance.
  • an insulation strip of the type mentioned is characterized in that at least partially a plurality of adjacent transverse to the elongated extension of the basic module, these are provided on the outer sides in a respective plane circumferential slots.
  • the basic idea of the invention is to advantageously extend the respective creepage path along the surface of the insulation support strip according to the invention by milling the circumferential slots.
  • An inventive slit in the Isolationsstrageelf preferably rotates these on all their outer sides in a respective plane.
  • the cross section of an insulating strip is preferably rectangular, but may also be circular, for example.
  • the length of such an insulating support bar is, for example, 2 m with a square cross section of, for example, 10 cm by 10 cm.
  • an easily milled material such as pressboard is suitable.
  • a monolithic press chip block or bar almost any array diversity for the circumferential slots, which may for example have a depth of 20mm for example, with a width of 10mm.
  • the insulating ability of a slot, which is milled into a smooth surface itself, is higher than the insulating ability of a, for example, corrugated surface.
  • areas of the insulating carrier strip which prove to be particularly critical with respect to the field strength loading can be provided with a higher density of preferably identically shaped slots than areas which are less than one prove critical. Suitable, for example, 4 cm slot spacing in a critical range and 8cm to 15cm in a less critical area.
  • the slots in a longer section of the insulating support strip according to the invention can also be cut in a particularly high density, for example every 2 cm to 4 cm.
  • an insulation strip strip according to the invention can be used particularly flexibly.
  • the attachment means at the ends of the insulation support bar are not necessarily designed as separate components, but may also include molded or chamfered geometries suitable for making a mechanical connection.
  • an area with connecting means for further components to be supported is provided in the basic module.
  • Such other components are, for example, supporting or holding elements for other transformer components such as discharge pipes or tap changers or else further insulation strips, which are then joined together to form an insulating support frame.
  • Connecting means are, for example, holes that allow screwing, in which case screw should be used from an insulating material such as pressboard.
  • connecting means may for example also include a milled notch or the like, whereby then a positive connection with an adapted further component or another component is made possible.
  • At least one U-shaped insulation plate is fitted positively into one of the circumferential slots.
  • an insulating strip with a rectangular cross-section is surrounded by the insulating plate from three sides, wherein preferably the fourth, open side of the insulating plate is designed to be overhanging.
  • the adhesive serves primarily to avoid that a creepage path can form over the slot.
  • a square or even circular cross section of the insulating carrier strip is particularly suitable, wherein in the former an arrangement in a grid of 90 ° is possible.
  • this embodiment also includes the option that two insulation plates are rotated against each other in the same slot, which then has accordingly twice the thickness of an insulating plate. This ensures that all side surfaces of the insulation strip strip are provided with a circumferential barrier.
  • the insulation plates which partly collide at their two-dimensional sides are preferably also to be glued there.
  • An insulation plate is similar to an insulation strip preferably made of a milled insulation material, such as pressboard.
  • an insulation support bar may have a considerable height, for example 3m, when provided as a vertical support on the inner sidewall of an oil boiler for a transformer.
  • insulation adapter modules can be connected in advance as mounting elements, for example, with a part of the inner boiler wall during assembly. These are then arranged so that an insulation strip with their mutually provided fasteners can be easily connected to the respective insulation adapter modules.
  • connection between fastening means and insulation adapter module has a positive tongue and groove connection.
  • an insulation strip with groove or spring can be particularly easily inserted into an insulation adapter module with a corresponding spring or groove. Slippage of such a connection can, for example be achieved by a fixing bolt or a fixing screw of an insulating material.
  • the fastening means of the insulation strip strip or the insulation adapter module on their respective side facing away from the base module on a slot-like and open on one side mounting groove.
  • This fastening groove serves to establish a connection with a fastening element which is fastened, for example, to a boiler wall or welded there.
  • a groove which is open at the side, allows the production of a mechanical connection by pushing laterally onto a bolt-like fastening element.
  • such a fastening element is designed rod-like and positively fitted with its one end into the slot-like fastening groove.
  • the cross section of this rod-like fastening element has, for example, the shape of an elevated circular cross-section, so that a rectangular cross-sectional segment is provided between two semicircular cross-sectional segments. In conjunction with the slot-like groove thus results in a variable compensation option for any tolerance dimensions in boiler construction.
  • the object according to the invention is also achieved by an insulating stringer comprising a plurality of insulation strands according to the invention directly or indirectly interconnected.
  • Such Isolationstraggerüst can serve in addition to the recording of diversion pipes or barriers and the inclusion of, for example, a tap changer.
  • the advantages of such a framework correspond to those of an insulation strip according to the invention, namely a space saving by an improved insulation capacity.
  • this comprises a bridge-like holder for a discharge pipe of an oil transformer.
  • This preferably has a U-shape, which also has an advantageous effect on the extension of the creepage path.
  • optional circumferential slots are also provided along the extension of the preferred manner made of a milled insulation material bridge-like holder provided in which also U-shaped insulation plates can be fitted.
  • an oil transformer comprising at least one oil boiler and a transformer arranged therein with winding and core, wherein the oil transformer further comprises an insulating strip according to the invention or an inventive Isolationstraggerüst.
  • the oil tank can be made smaller due to the then more compact arrangement, for example, the discharge components in its oil-filled interior.
  • Fig. 1 shows an exemplary first Isolationsstrageor 10 in a plan view 10a and in a rotated by 90 ° thereto side view 10b.
  • ends 14, 16 are formed, which have respective fastening means, in this example a groove 22 and holes 24.
  • These fasteners are used to attach the Isolationstrageang 10 either directly with a provided inside the boiler fastener or with an insulation adapter module, which quasi as an intermediate piece between the fastening element and Isolationstrageador serves and, if necessary, a simplified installation allows.
  • a plurality of transverse thereto extending in a respective plane slots 18 are provided, which for example have a width of 12mm and a depth of 30mm. These serve on the one hand the extension of the creepage path along the outer surfaces of the insulation strip but on the other hand also the optional inclusion of U-shaped insulation plates, by which the insulation capacity of the insulation strip individually and, if necessary, can be further increased.
  • connecting means 20 are provided to connect components to be supported therewith.
  • the connecting means consist in this example of two holes through which screws or bolts can be inserted, so that thus a non-positive connection to other components with corresponding counterbores can be produced.
  • Fig. 2 shows an exemplary first insulation adapter module 30 in a three-dimensional perspective view.
  • This has essentially a parallelepiped-like basic shape, which is adapted in its cross section to the cross section of an insulating strip to be joined thereto.
  • a cuboid spring 32 is formed, which in turn is adapted in shape to a corresponding groove in the Isolationstrageelf, so that thus a tongue and groove connection can be produced.
  • two bores 34 extending through the spring 32 are provided, which correspond with two bores of the groove of the insulation strip strip, not shown.
  • a bolt or a screw can be introduced there in a simple manner, wherein these are preferably made of an insulating material.
  • a slot-like fastening groove 36 which is open on one side, is provided. This is suitable for receiving a rod-like fastener with an elongated circular cross-section, which with one of its two ends form-fit in the Fixing groove 36 is fitted.
  • a transverse bore 38 is provided to fix the rod-like fastener in the mounting groove 36.
  • Fig. 3 shows a U-shaped insulation plate 50, which is preferably made of an insulating material such as pressboard and is positively fit into a slot of a matching Isolationstrageelf square cross-section is fitted.
  • the U-shaped insulation plate has a square base, is symmetrical to the axis of symmetry 52 and can be fitted in four different, each offset by 90 ° orientations on an associated Isolationsstrageolin square cross section.
  • the edges of the insulation plate 50 are rounded to eliminate any field strength problem.
  • the Fig. 4 shows an exemplary second isolation bar 60 in a plan view 60a and in a 90 ° rotated side view 60b.
  • the insulation support strip 60 substantially corresponds to that in the Fig. 1 shown Isolationstrageang 10, but an insulation adapter module 66 and 68 are respectively provided at both ends thereof, which are fastened by means of a tongue and groove connection and are to be regarded as an extension of the insulation support bar 60 quasi.
  • Rod-like fastening elements 70, 72 are provided on the respective ends of the insulation adapter modules 66, 68 facing away from the tongue-and-groove connection, which engage positively and non-positively in corresponding fastening grooves of the insulation adapter modules 66, 68 which are open to one side.
  • Such fasteners 70, 72 may, for example, be intrinsically welded to the lower and upper boundaries of an oil boiler, such that an insulation stringer 60 may be mounted or inserted therebetween, similar to a column.
  • the connection region around the bores is mostly field strength critical.
  • corresponding U-shaped insulation splices 62, 64 are fitted in adjacent circumferential slots. To creep on all sides of the Isolationstrageelf caused by this increase the U-shaped insulation plates are divided into a first group 62 and a second group 64, which are arranged in an alternating arrangement rotated by 180 °.
  • Fig. 5 shows an exemplary isolation truss frame 80 in a plan view.
  • a bridge-like holder 86 is arranged, which carries a screen tube 88 in its center.
  • the insulation supporting strips 82, 84 are provided with U-shaped insulation plates fitted in respective slits.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)
  • Insulating Bodies (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP20120002539 2012-04-10 2012-04-10 Baguette de support d'isolation Active EP2490230B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20120002539 EP2490230B1 (fr) 2012-04-10 2012-04-10 Baguette de support d'isolation
HRP20140868AT HRP20140868T1 (hr) 2012-04-10 2014-09-12 Izolacijska nosiva traka

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20120002539 EP2490230B1 (fr) 2012-04-10 2012-04-10 Baguette de support d'isolation

Publications (3)

Publication Number Publication Date
EP2490230A2 true EP2490230A2 (fr) 2012-08-22
EP2490230A3 EP2490230A3 (fr) 2012-11-07
EP2490230B1 EP2490230B1 (fr) 2014-06-25

Family

ID=46084712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20120002539 Active EP2490230B1 (fr) 2012-04-10 2012-04-10 Baguette de support d'isolation

Country Status (2)

Country Link
EP (1) EP2490230B1 (fr)
HR (1) HRP20140868T1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11295886B2 (en) 2016-03-08 2022-04-05 Siemens Energy Global GmbH & Co. KG Winding arrangement having a plug-in bushing

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3404987A1 (de) * 1984-02-11 1985-08-14 Robert Bosch Gmbh, 7000 Stuttgart Hochspannungsisolator
US4870387A (en) * 1987-10-28 1989-09-26 A. B. Chance Company Beam strengthened cutout insulator
EP2445071B1 (fr) * 2010-10-15 2014-01-01 ABB Technology AG Support pour conduites de haute tension dans des transformateurs d'huile

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11295886B2 (en) 2016-03-08 2022-04-05 Siemens Energy Global GmbH & Co. KG Winding arrangement having a plug-in bushing

Also Published As

Publication number Publication date
EP2490230A3 (fr) 2012-11-07
EP2490230B1 (fr) 2014-06-25
HRP20140868T1 (hr) 2014-12-19

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