EP3001433B1 - Support isolant de connection électrique adapté a un transformateur - Google Patents

Support isolant de connection électrique adapté a un transformateur Download PDF

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Publication number
EP3001433B1
EP3001433B1 EP14186829.9A EP14186829A EP3001433B1 EP 3001433 B1 EP3001433 B1 EP 3001433B1 EP 14186829 A EP14186829 A EP 14186829A EP 3001433 B1 EP3001433 B1 EP 3001433B1
Authority
EP
European Patent Office
Prior art keywords
post insulator
transformer
shielding
inner conductor
tap
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.)
Active
Application number
EP14186829.9A
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German (de)
English (en)
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EP3001433A1 (fr
Inventor
Rudolf Hanov
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.)
Siemens Energy Global GmbH and Co KG
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Siemens Energy Global GmbH and Co KG
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Publication date
Application filed by Siemens Energy Global GmbH and Co KG filed Critical Siemens Energy Global GmbH and Co KG
Priority to EP14186829.9A priority Critical patent/EP3001433B1/fr
Priority to PCT/EP2015/071285 priority patent/WO2016050522A1/fr
Publication of EP3001433A1 publication Critical patent/EP3001433A1/fr
Application granted granted Critical
Publication of EP3001433B1 publication Critical patent/EP3001433B1/fr
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Classifications

    • 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 feedthrough system for a connection of a dry-type transformer with externally grounded shielding, the coil winding of which is equipped with connections and taps, comprising a substantially circular-cylindrical post insulator and a connection inner conductor that extends through the post insulator and for the passage of a connection through the post insulator serves.
  • a dry-type transformer is a transformer that does not contain liquid insulating materials such as e.g. B. contains transformer oil. Dry-type transformers are usually used as power transformers, in particular as such in electrical power networks. They are therefore often designed as a three-phase alternating current transformer. Dry-type transformers are used particularly where, due to the physical proximity to people or property, oil-filled transformers cannot be used or only with significant fire protection measures, such as e.g. B. fire protection walls can be set up. There is also no need for oil collection pits to protect the groundwater.
  • dry-type transformers are usually designed with two-leg or three-leg iron cores made of electrical sheets insulated on both sides.
  • the legs which are provided with the coil windings, are connected to one another on both sides by yokes.
  • Transformers can be designed with taps on the coil windings on both the primary and secondary sides.
  • the taps are used to adapt and use the transformer to different voltages. What was said above about the connections also applies to the taps on the transformer: these must also be routed through the shielding in appropriate support insulators.
  • the tap often has to be positioned on the opposite side of the connections. This may not be possible due to a lack of space at the installation site. In such cases no taps could be provided.
  • the US 3,611,132A discloses a so-called plug-in bushing used for passing a high-voltage conductor through a grounded wall of a distribution transformer.
  • the distribution transformer has a tank that is filled with insulating oil, which is intended both for insulation and for cooling the active part of the transformer, which is also located in the tank.
  • the bushing has a rotationally symmetrical insulator through which a single high-voltage conductor extends. The insulator thus enables the high-voltage conductor to be routed through the tank, which is at ground potential, in a fail-safe manner.
  • the U.S. 3,001,005A also discloses a bushing having a rotationally symmetrical insulator through which a high voltage conductor extends longitudinally. This implementation also serves to insulate the high-voltage conductor through a wall of a transformer tank that is at ground potential.
  • the CA 830640A discloses a bushing system used to connect an oil-immersed transformer that has a grounded shield on the outside.
  • the invention is based on the consideration that an additional post insulator for taps could be avoided by routing the taps together with the connections through the shielding through a common post insulator.
  • the post insulator should have an additional inner conductor that is connected to the tap.
  • the additional tapping inner conductor is electrically separated from the connection inner conductor by means of a corresponding spatial separation within the post insulator with insulating material lying between them.
  • the post insulator has a plurality of tapped-through inner conductors for feeding through the shielding in each case with a tap. More taps lead to even greater flexibility of the transformer in terms of adapting to different voltages. The relocation of several tapping bushings into a joint bushing with the connection eliminates space problems that occur here.
  • a contact point connected to the connecting inner conductor of the post insulator and a contact point connected to the respective tapping inner conductor for each of the tapping inner conductors are arranged at an outer end of the post insulator.
  • a covering cap of this type which is screwed or plugged onto the post insulator, allows the external lines to be connected in a particularly simple manner.
  • contact points are arranged radially around a central contact point, i. H. the connecting lines between the contact point and connection and taps are arranged in a fan-like manner.
  • the external cabling can remain permanently connected to the central contact point while only a straight, conductive connection is made from the central contact point to the contact point of the connector or one of the contact points of the tap connections must. In particular, this enables a simple change during operation.
  • an insulating material is advantageously arranged between the contact points, so that the electrical isolation is optimized.
  • the bushing system comprises a disc-shaped shielding ring which is made from an insulating material and encloses the post insulator in a flush manner. Because of the risk of breakdown, on the outside of the dry-type transformer, a large distance must be maintained between the external connection and the tapping connections on the post insulator and the shielding. This requires the use of correspondingly long post insulators, which protrude far out of the shielding on the outside. A disc-shaped shielding ring can be used to achieve a shorter distance between the external connection and the shielding, and thus a shorter post insulator can be used.
  • the shielding ring encloses the post insulator flush. On the one hand, this achieves a gapless, electrically tight insulation for the shielding, which on the other hand is easy to attach.
  • the shielding ring is advantageously in the form of a circular disk in order to ensure adequate insulation in all spatial directions.
  • the shielding ring advantageously has more than three times the diameter of the post insulator. This refers to the bushing system seen from the axial direction of the post insulator.
  • the shielding ring thus extends from the edge of the post insulator in each radial direction at least over a further diameter of the post insulator.
  • the shielding ring tapers towards its outer edge. As the distance from the inner conductor of the post insulator increases, the distance between a point on the surface of the shielding and the connection on the post insulator increases, so that a smaller insulating thickness is required.
  • the taper makes the shielding ring lighter and therefore more mechanically stable.
  • the shielding ring is made of cast resin.
  • Casting resin has the advantage that it can be shaped completely flexibly due to the liquid processing.
  • the shielding ring can thus be cast in a mold in a simple manner.
  • Casting resin also has the high resistance required for this application and a corresponding dielectric strength.
  • a dry-type transformer with an outer grounded shield advantageously comprises a bushing system, as described above, arranged in a connection opening of the grounded shield.
  • the shielding ring is arranged on the outside of the grounded shielding, which encloses one leg of the dry-type transformer.
  • the tapping inner conductors are connected to a winding in the area of the turn of the dry transformer associated with the connection inner conductor.
  • the taps are arranged in the area of the winding end, i. H. near the winding associated with the transformer terminal. This ensures that the taps are at a similar potential as the connection.
  • the inner conductor for the tap and the inner conductor for the connection have a relative potential difference of less than 10%. This ensures that the inner conductors of the taps and connection, which are routed through the common post insulator, have only a small potential difference and breakdowns are avoided.
  • a dry transformer designed according to the aforementioned type is advantageously designed for a rated voltage of more than 1 kV and/or a rated power of more than 50 kVA.
  • the design of the bushing system described above, with a common bushing for connection and taps, is of considerable advantage.
  • the dry transformer is advantageously designed as a cast resin transformer, i. H. the insulation of the high-voltage windings consists of cast resin.
  • the advantages achieved with the invention are in particular that by carrying out the taps and the connections in a common post insulator of a dry-type transformer, a significant space saving can be achieved and the dry-type transformer can thus be used much more flexibly with regard to its installation location.
  • the bushing system 1 described below is designed for cast-resin transformers with a nominal voltage of more than 1 kV and/or a nominal power of more than 50 kVA and accordingly has a corresponding size. It is therefore particularly suitable for power transformers in electrical energy networks.
  • the implementation system 1 is in the FIG 1 shown in longitudinal section.
  • the inside of the transformer is located on the left, the outside on the right.
  • the central, supporting component is a circular-cylindrical support insulator 2 (post), parallel to the axis of which is an electrical connecting inner conductor 4 and spaced apart from one another a total of four electrical tapping inner conductors.
  • the post insulator On the outside, the post insulator has a flange 6 at some distance from its outer end.
  • the rest of the post insulator 2 is made of an insulating material known to those skilled in the art.
  • Connection inner conductor 4 and tapping inner conductor 5 are connected to a winding of the transformer in a common area, ie only a few turns apart from one another.
  • the connection is designed in such a way that the tapping inner conductor 5 has a relative potential difference of -5%, -2.5%, +2.5% and +5% to the connection inner conductor 4 have.
  • the main purpose of the post insulator 2 is to enable electrical contact to the wire windings inside the transformer. This is because they are surrounded by a grounded, metallic shield that is applied as a conductive earth covering 8 to the cast resin coil 6 .
  • This has a circular opening on the post insulator 2 , the diameter of which essentially corresponds to the outer diameter of the post insulator 2 .
  • the post insulator is cast in one piece with the coil 6 and, like the coil 6, is partially covered by a layer of earth 8 that extends along the jacket of the post insulator 2 over a short distance to an O-ring 10 that extends in a groove extends circularly around the whole post insulator 2.
  • the O-ring 10 is made of a conductive material.
  • the O-ring 10 is followed by a tapered but still circularly symmetrical section 12 of the post insulator 2.
  • a shielding ring 14 is pushed onto the tapered section 12 of the post insulator 2 from the end, which is essentially shaped like a circular ring.
  • the shielding ring 14 has an inner cylinder-jacket-shaped opening, the inside diameter of which essentially corresponds to the outside diameter of the post insulator 2 in the tapered section 12, but both components are designed for a press fit.
  • the shielding ring 14 is rotationally symmetrical. Its outer diameter is about three times the outer diameter of the post insulator 2.
  • the axial thickness of the shielding ring 14 at its central opening is only slightly less than the axial length of the tapered section 12 of the post insulator 2.
  • the shielding ring 14 is tapered in thickness towards its outer diameter. It is made entirely of cast resin.
  • the connecting inner conductor 4 and the tapping inner conductor 5 are connected to exposed contact points 16. These are only covered by a cover cap 18 . Position and arrangement of the contact points 16 are based on the FIG 1 and the FIG 2 described.
  • FIG 2 shows the bushing system 1 from direction A, ie axially from the outside, below the covering cap 18.
  • the circular diameter of the shielding ring 14 and of the post insulator 2 can be seen.
  • the end base area of the post insulator 2 is also shown.
  • a central contact point 20 is arranged offset from the central axis of the post insulator 2 on the end base. This is only superficially provided and no inner conductor connects directly to this contact point 20 .
  • An external cable 24 with insulation 26 is attached to the central contact point 20 by means of a screw 22 through the covering cap 18 .
  • the contact points 16 are evenly spaced in a radial pattern about the central contact point 20 on the end footprint, i. H. the connecting lines between each of the contact points 16 and the central contact point 20 form a uniform fan.
  • Raised walls 28 made of insulating material are arranged between the contact points 16 and are made in one piece with the covering cap 18 .
  • a metal rod 30 in the length of the distance between contact points 16 and central contact point 20 can be used to establish a connection from central contact point 20 and thus from cable 24 to one of contact points 16, i.e. either to one of the tap inner conductor 5 or to the connection inner conductor 4 become.
  • the other possible positions of the metal rod 30 are shown in dashed lines.
  • FIG. 3 finally shows a dry transformer 38, which is designed as a cast resin transformer. It has an iron core made of layers of electrical steel.
  • the iron core of the dry-type transformer 38 has three mutually parallel limbs wound with wire windings, each of which is surrounded by a grounded shielding 40 in the shape of a cylinder jacket.
  • the legs are connected to one another at their ends by yokes 42 .
  • connection openings are each in the middle of the upper and lower halves of the legs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Insulators (AREA)

Claims (9)

  1. Système (1) de traversée pour une connexion d'un transformateur (38) à sec comprenant un blindage (40) extérieur mis à la terre, dont l'enroulement de bobine est équipé de raccordements et de branchements comprenant un isolateur (2) support sensiblement cylindrique de section circulaire et un conducteur (4) intérieur de raccordement ainsi qu'au moins un conducteur (5) intérieur de branchement, qui s'étendent à travers l'isolateur (2) support et qui servent à la traversée d'une connexion à travers l'isolateur (2) support, dans lequel, à une extrémité extérieure de l'isolateur (2) support, sont disposés un point (16) de contact relié au conducteur (4) intérieur de raccordement de l'isolateur (2) support ainsi que, pour chacun des conducteurs (5) intérieurs de branchement, un point (16) de contact relié au conducteur (5) intérieur de branchement respectif,
    caractérisé en ce que
    les points (16) de contact sont disposés en forme de rayons autour d'un point (20) central de contact, auquel ne se raccorde pas de conducteur intérieur.
  2. Système (1) de traversée suivant la revendication 1, dans lequel l'isolateur (2) support a une pluralité de conducteurs (5) intérieurs de branchement de traversée pour la traversée respectivement d'un branchement à travers le blindage (40).
  3. Système (1) de traversée suivant la revendication 1 ou 2, dans lequel un matériau isolant est disposé entre les points (16) de contact.
  4. Système (1) de traversée suivant l'une des revendications précédentes, qui comprend un anneau (14) de blindage en forme de disque, qui est en un matériau isolant et qui entoure à affleurement l'isolateur (2) support.
  5. Transformateur (38) à sec ayant un blindage (40) extérieur mis à la terre, comprenant un système (1) de traversée suivant l'une des revendications précédentes, monté dans une ouverture de raccordement du blindage (40) mis à la terre.
  6. Transformateur (38) à sec suivant la revendication 5, dans lequel les conducteurs (5) intérieurs de branchement sont reliés à une spire, dans la partie de la spire, associée au conducteur (4) intérieur de raccordement, du transformateur (38) à sec.
  7. Transformateur (38) à sec suivant la revendication 5 ou 6, dans lequel des conducteurs (5) intérieurs de branchement et des conducteurs (4) intérieurs de raccordement ont une différence de potentiel relative de moins de 10 %.
  8. Transformateur (38) à sec suivant l'une des revendications 5 à 7, conçu pour une tension nominale de plus de 1 kV et/ou une puissance nominale de plus de 50 kVA.
  9. Transformateur (38) à sec suivant l'une des revendications 5 à 8, qui est conçu sous la forme d'un transformateur à résine de coulée.
EP14186829.9A 2014-09-29 2014-09-29 Support isolant de connection électrique adapté a un transformateur Active EP3001433B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP14186829.9A EP3001433B1 (fr) 2014-09-29 2014-09-29 Support isolant de connection électrique adapté a un transformateur
PCT/EP2015/071285 WO2016050522A1 (fr) 2014-09-29 2015-09-17 Isolateur support adapté à un transformateur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14186829.9A EP3001433B1 (fr) 2014-09-29 2014-09-29 Support isolant de connection électrique adapté a un transformateur

Publications (2)

Publication Number Publication Date
EP3001433A1 EP3001433A1 (fr) 2016-03-30
EP3001433B1 true EP3001433B1 (fr) 2023-05-24

Family

ID=51619095

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14186829.9A Active EP3001433B1 (fr) 2014-09-29 2014-09-29 Support isolant de connection électrique adapté a un transformateur

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EP (1) EP3001433B1 (fr)
WO (1) WO2016050522A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA830640A (en) * 1969-12-23 L. Wright Leonard Insulating bushing and releasable cable terminal connection

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3001005A (en) * 1959-07-23 1961-09-19 Westinghouse Electric Corp Terminal bushings
US2997676A (en) * 1960-01-25 1961-08-22 Westinghouse Electric Corp Electrical inductive apparatus
US3611132A (en) * 1969-09-30 1971-10-05 Westinghouse Electric Corp Plug-in electrical bushing
DE2938792C2 (de) * 1979-09-25 1983-04-14 Transformatoren Union Ag, 7000 Stuttgart Einphasen-Transformator mit in Gießharz vergossenen Wicklungen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA830640A (en) * 1969-12-23 L. Wright Leonard Insulating bushing and releasable cable terminal connection

Also Published As

Publication number Publication date
WO2016050522A1 (fr) 2016-04-07
EP3001433A1 (fr) 2016-03-30

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