EP4372767A1 - Kit pour un dispositif de traversée destiné à la connexion électrique d'une installation de transformateur - Google Patents

Kit pour un dispositif de traversée destiné à la connexion électrique d'une installation de transformateur Download PDF

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Publication number
EP4372767A1
EP4372767A1 EP22207868.5A EP22207868A EP4372767A1 EP 4372767 A1 EP4372767 A1 EP 4372767A1 EP 22207868 A EP22207868 A EP 22207868A EP 4372767 A1 EP4372767 A1 EP 4372767A1
Authority
EP
European Patent Office
Prior art keywords
insulating element
conductor
housing wall
kit
sealing ring
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.)
Pending
Application number
EP22207868.5A
Other languages
German (de)
English (en)
Inventor
Seyfi GEZER
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.)
Preis GmbH
Original Assignee
Preis GmbH
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 Preis GmbH filed Critical Preis GmbH
Priority to EP22207868.5A priority Critical patent/EP4372767A1/fr
Publication of EP4372767A1 publication Critical patent/EP4372767A1/fr
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • H01B17/30—Sealing
    • H01B17/303—Sealing of leads to lead-through insulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • H01B17/265—Fastening of insulators to support
    • 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
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements

Definitions

  • the invention relates to a kit for a bushing arrangement for the electrical connection of a transformer system through an opening in a housing wall of the transformer system, the kit comprising the following: at least one electrical conductor for the electrical connection of a power connection of a transformer system, the electrical conductor having a rod-shaped first section with a circular cross-section, hereinafter referred to as the main section, which opens into a widened, second section, hereinafter referred to as the end section, the end section preferably having a rectangular cross-section, at least one first insulating element which can be inserted into the opening of the housing wall and which has a cylindrical bushing opening for at least partially receiving the main section of the conductor, the cylindrical bushing opening of the first insulating element being designed to guide the conductor from an outside of the housing wall to an inside of the housing wall and further being designed to insulate the conductor along the guide within the bushing opening from the housing wall, the insulating element having a first stop surface by means of which an insertion movement of the insulating
  • the insulating element further comprises a second stop surface against which the end section of the conductor can be supported in a state in which the main section is guided through the cylindrical feedthrough opening and can thereby be secured against being pulled out in the direction of the main section, at least one sealing ring which can be placed on the main section of the conductor, wherein the main section of the conductor is provided at least in sections with a thread for receiving a screw nut, by means of which the sealing ring can be clamped against the insulating element in the inserted state of the conductor and the end section is thereby clamped against the second stop surface.
  • EP3731247A1 discloses a rail bushing that can be inserted and mounted from the outside into an opening in a housing wall of a transformer. Access from the inside is not required for mounting the bushing.
  • the WO 2018210637 A1 shows another concept, this time for a rod conductor with a widened end section, where the bushing can also be tightened from the outside.
  • the insulating material used is made of porcelain or, more recently, hardened epoxy material, which is characterized by good electrical insulating properties and high weather resistance.
  • An object of the invention is therefore to provide a bushing which overcomes the disadvantages of the prior art and yet allows simple assembly.
  • the insulating element has a spread in the region of the first stop surface which is penetrated by at least three mounting openings for receiving fixing bolts which can be arranged on the housing wall, wherein the longitudinal axes of the mounting openings are oriented parallel to the longitudinal axis of the feedthrough opening, wherein the insulating element consists essentially of a mixture of polyamide and glass fiber and is produced by injection molding and wherein the kit further comprises a sealing element which can be inserted between the first stop surface and the outside of the housing wall and can be clamped against the outside of the housing wall by tightening the insulating element to the fixing bolt by means of the stop surface.
  • the kit is lightweight, has high mechanical stability and excellent insulating properties.
  • such an insulating element can be installed more easily and with a better CO2 balance than an insulating element made of porcelain.
  • the increased mechanical stability in combination with the lower weight has great advantages both during transport (as the susceptibility to breakage is reduced and packaging material can be saved) and during use (e.g. in wind turbines, where the transformers are partially installed in the nacelles and are therefore exposed to mechanical vibrations that have already led to breakage of porcelain insulation, especially when mounted in a horizontal orientation).
  • the kit can be used in particular for bushing arrangements for the output side of a step-down transformer, which is used to transform a higher voltage level to a lower one, thereby isolating the output side and is e.g. 1kV, preferably at least 1kV.
  • the current strengths that are conducted via the bushing are nominal currents between typically 250A and 5kA. In principle, however, 10kA or more are also conceivable.
  • Another advantage of production by injection molding is the high manufacturing precision that can be achieved. The tolerances are, for example, in the order of +- 0.5mm (compared to porcelain insulating elements, which often have tolerances of +- 5mm).
  • the kit can also be used for feedthrough arrangements for the input side of a step-up transformer. Depending on the respective design, the kit can be suitable for use on the input and output sides of the transformers.
  • the kit comprises the screw nut, by means of which the sealing ring can be tightened against the insulating element when the conductor is inserted, the sealing ring and a cover cap which is designed to at least partially enclose the sealing ring and to evenly transfer mechanical pressure exerted by the screw nut to the sealing ring.
  • the kit is at least partially pre-assembled in that the conductor is already inserted into the feedthrough opening of the insulating element and the sealing ring sits on the insulating element, the cover cap is arranged above the sealing ring and this is pressed against the sealing ring with the screw nut, which engages the thread of the conductor, so that the latter is clamped tightly between the insulating element and the conductor in a watertight manner.
  • the polyamide of the insulating element is polyamide 6.6 and the glass fiber content is between 20% and 40%, in particular between 28% and 32%.
  • polyamide 6.6 black 30% GF i.e. 30% glass fiber content
  • This information is to be understood as a percentage by weight.
  • the glass fiber content serves to reinforce the polyamide. This increases the rigidity, mechanical strength and hardness.
  • a groove is formed in the widening, which is designed to at least partially enclose the sealing element.
  • the insulating element is designed as a single cast body. This means that the cast body is formed in one piece and is obtained by a single casting.
  • the insulating element has reinforcement struts on its outer side which protrude in the radial direction and are evenly spaced from one another, which extend from the widening towards an upper side of the insulating element and continuously taper at least along 80% of their extension measured along the longitudinal axis of the insulating element.
  • the insulating element has at least three reinforcing struts, preferably between four and ten reinforcing struts.
  • the insulating element has exactly four mounting openings, which are arranged such that the centers of the mounting openings form the corner points of a square, wherein the center of gravity of the square coincides with the center of the cross-section of the conductor.
  • the bushing arrangement composed of a kit according to one of the preceding claims and a housing wall of a transformer, wherein fixing bolts provided with a screw thread are arranged on the outside of the housing wall, to which the insulating element is fastened by attaching a screw connection and is clamped against the outside of the housing wall by means of the first stop surface, wherein between the first stop surface and The sealing element is arranged on the outside of the housing wall and is clamped in place by tightening the screw connection.
  • Figure 1 shows a schematic perspective view of a kit 1 according to the invention in the assembled state.
  • the kit 1 is designed to produce a feedthrough arrangement 12 for electrically connecting a transformer system through an opening 2a in a housing wall 2 of the transformer system.
  • the kit 1 comprises at least one electrical conductor 3 for electrically connecting a power connection of a transformer system.
  • the electrical conductor 3 has a rod-shaped first section with a circular cross-section, hereinafter referred to as the main section 3', which extends into a widened, second section, hereinafter referred to as end section 3".
  • the end section 3" preferably has a rectangular cross-section.
  • the kit has at least one first insulating element 4 which can be inserted into the opening 2a of the housing wall 2 and which has a cylindrical through-opening 4a for at least partially receiving the main section 3' of the conductor 3, wherein the cylindrical through-opening 4a of the first insulating element 4 is designed to guide the conductor 3 from an outer side 2' of the housing wall 2 to an inner side 2" of the housing wall 2 and is further designed to electrically insulate the conductor 3 along the guide within the through-opening 4a from the housing wall 2.
  • the insulating element 4 has a first stop surface 4', by means of which an insertion movement of the insulating element 4 in the direction of the opening 2a of the housing wall 2 can be limited by the first stop surface 4' (see Fig.3 ) can be supported on the outside 2' of the housing wall 2, and wherein the insulating element 4 further comprises a second stop surface 4" (see Fig.3 ) against which the end section 3" of the conductor 3 can be supported in a state in which the main section 3' is guided through the cylindrical through-opening 4a and can thereby be secured against being pulled out in the direction of the main section 3'.
  • the conductor 3 is already inserted into the insulating element 4 and secured against being pulled out in the direction of the main section 3'.
  • the kit has at least one sealing ring 8 (see Fig.3 ) which can be placed on the main section 3' of the conductor 3.
  • the main section 3' of the conductor 3 is provided at least in sections with a thread 3a (not shown in detail in the figures) for receiving a screw nut 5, by means of which the sealing ring 8 can be clamped against the insulating element 4 when the conductor 3 is inserted, and the end section 3" is thereby clamped against the second stop surface 4".
  • the insulating element 4 has a spread 4b in the area of the first stop surface 4', which is surrounded by at least three mounting openings 4c (see Fig. 5b ) for receiving fixing bolts 6 that can be arranged on the housing wall 2, wherein the longitudinal axes L4c of the mounting openings 4c are oriented parallel to the longitudinal axis L4a of the feedthrough opening 4a, wherein the insulating element 4 consists essentially of a mixture of polyamide and glass fiber and is produced by injection molding.
  • the kit 1 has a sealing element 9 (see Fig.3 ) which is located between the first stop surface 4' and the outside 2' of the housing wall 2 and can be clamped against the outside 2' of the housing wall 2 by tightening the insulating element 4 to the fixing bolt 6 by means of the stop surface 4'.
  • a Fig.3 shown groove 4b' is formed, which is designed to at least partially enclose the sealing element 9.
  • the insulating element 4 is formed as a single cast body.
  • kit 1 contains the screw nut 5, by means of which the sealing ring 8 (see Fig.3 ) can be tensioned against the insulating element 4 in the inserted state of the conductor 3, comprises the sealing ring 8 and a cover cap 10 which is designed to at least partially enclose the sealing ring 8 and to transmit mechanical pressure exerted by the screw nut 5 evenly to the sealing ring 8.
  • the kit 1 can be provided to be at least partially pre-assembled, in that the conductor 3 is already inserted into the feedthrough opening 4a of the insulating element 4, and the sealing ring 8 sits on the insulating element 4, the cover cap 10 is arranged above the sealing ring 8 and this is pressed against the sealing ring 8 with the screw nut 5, which engages the thread 3a of the conductor 3, so that the latter is clamped tightly between the insulating element 4 and the conductor 3 in a watertight manner.
  • the insulating element 4 has on its outside in the radial direction protruding reinforcement struts 4d that are evenly spaced from one another and extend from the widened portion 4b to an upper side 4′′′ of the insulating element 4 and taper continuously at least along 80% of their extension measured along the longitudinal axis L4a of the insulating element 4.
  • the insulating element 4 has at least three reinforcement struts 4d, preferably between four and ten reinforcement struts 4d.
  • the insulating element 4 has exactly four mounting openings 4c, which are arranged in such a way that the centers of the mounting openings 4c form the corner points of a square, the center of gravity of the square being aligned with the center M (see Figure 1 ) of the cross-section of conductor 3.
  • the invention further relates to a feedthrough arrangement 12 (see Fig.1 and Fig.3 ), composed of a kit 1 according to the invention and a housing wall 2 of a transformer, wherein fixing bolts 6 provided with a screw thread are arranged on the outer side 2' of the housing wall 2, to which fixing bolts the insulating element 4 is fastened by attaching a screw connection 11 and is clamped against the outer side 2' of the housing wall 2 by means of the first stop surface 4', wherein the sealing element 9 is arranged between the first stop surface 4' and the outer side 2' of the housing wall 2 and is clamped in a sealing manner by tightening the screw connection 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Bodies (AREA)
EP22207868.5A 2022-11-16 2022-11-16 Kit pour un dispositif de traversée destiné à la connexion électrique d'une installation de transformateur Pending EP4372767A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22207868.5A EP4372767A1 (fr) 2022-11-16 2022-11-16 Kit pour un dispositif de traversée destiné à la connexion électrique d'une installation de transformateur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22207868.5A EP4372767A1 (fr) 2022-11-16 2022-11-16 Kit pour un dispositif de traversée destiné à la connexion électrique d'une installation de transformateur

Publications (1)

Publication Number Publication Date
EP4372767A1 true EP4372767A1 (fr) 2024-05-22

Family

ID=84358752

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22207868.5A Pending EP4372767A1 (fr) 2022-11-16 2022-11-16 Kit pour un dispositif de traversée destiné à la connexion électrique d'une installation de transformateur

Country Status (1)

Country Link
EP (1) EP4372767A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3159901A1 (fr) * 2015-10-20 2017-04-26 Pioch Dispositif passe-barre, ensemble passe-barre comprenant un tel dispositif, ensemble électrique correspondant
WO2018210637A1 (fr) 2017-05-15 2018-11-22 Spax International Gmbh & Co. Kg Élément vis
EP3410448A1 (fr) * 2017-06-01 2018-12-05 Preis & Co Ges.m.b.H. Kit pour un dispositif de traversée
EP3731247A1 (fr) 2019-04-24 2020-10-28 Preis & Co Ges.m.b.H. Ensemble pour un dispositif de passage permettant de connecter électriquement une installation de transformateur

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3159901A1 (fr) * 2015-10-20 2017-04-26 Pioch Dispositif passe-barre, ensemble passe-barre comprenant un tel dispositif, ensemble électrique correspondant
WO2018210637A1 (fr) 2017-05-15 2018-11-22 Spax International Gmbh & Co. Kg Élément vis
EP3410448A1 (fr) * 2017-06-01 2018-12-05 Preis & Co Ges.m.b.H. Kit pour un dispositif de traversée
EP3731247A1 (fr) 2019-04-24 2020-10-28 Preis & Co Ges.m.b.H. Ensemble pour un dispositif de passage permettant de connecter électriquement une installation de transformateur

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