EP3001433A1 - Support isolant de connection électrique adapté a un transformateur - Google Patents

Support isolant de connection électrique adapté a un transformateur Download PDF

Info

Publication number: EP3001433A1
Authority: EP; European Patent Office
Prior art keywords: transformer; inner conductor; shield; dry; support insulator
Prior art date: 2014-09-29
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

EP14186829.9A

Other languages

German (de)

English (en)

Other versions

EP3001433B1 (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

Original Assignee

Siemens AG

Siemens Corp

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.)

2014-09-29

Filing date

2014-09-29

Publication date

2016-03-30

2014-09-29 Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG

2014-09-29 Priority to EP14186829.9A priority Critical patent/EP3001433B1/fr

2015-09-17 Priority to PCT/EP2015/071285 priority patent/WO2016050522A1/fr

2016-03-30 Publication of EP3001433A1 publication Critical patent/EP3001433A1/fr

2023-05-24 Application granted granted Critical

2023-05-24 Publication of EP3001433B1 publication Critical patent/EP3001433B1/fr

Status Active legal-status Critical Current

2034-09-29 Anticipated expiration legal-status Critical

Images

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 outer grounded shielding, comprising a substantially circular-cylindrical post insulator with a connected inner conductor for carrying out the connection through the shield.
a dry-type transformer is a transformer which does not contain liquid insulating materials such as e.g. B. contains transformer oil. Dry transformers are commonly used as power transformers, in particular as such in electrical energy networks. They are therefore often three-phase designed as a three-phase AC transformer. Dry transformers are used especially where due to the proximity to persons or property oil-filled transformers or only with significant fire protection measures such. B. fire walls, can be placed. Also, oil catchment pits do not contribute to groundwater protection.
dry-type transformers are usually designed with two- or three-core iron cores made from electrically insulated electrical steel sheets on both sides.
the legs, which are provided with the coil windings are connected on both sides by yokes. It is known to increase the security to provide the legs with an outer shield, which completely surrounds the legs, is made of an electrically conductive material and grounded.
Transformers can be designed on both the primary and the secondary side with taps of the coil windings.
the taps serve to adapt and use the transformer to different voltages. What has been said above regarding the connections also applies to the taps of the transformer: These must also be routed through the shielding in corresponding post insulators.
the tap must be positioned on the opposite side of the terminals. Due to lack of space at the installation site, this may not be possible. In such cases, no taps could be provided.
the support insulator has a tapped inner conductor that is carried out to carry out a tapping action through the shielding.
the invention is based on the consideration that an additional support insulator for taps could be avoided that the taps are performed together with the terminals by a common post insulator through the shield.
the support insulator should have an additional inner conductor, which is connected to the tap.
the additional tapping inner conductor is thereby electrically separated from the terminal inner conductor by a corresponding spatial separation within the support insulator with intermediate insulating material.
the support insulator has a plurality of tapped inner conductors carried out for carrying out in each case a tap through the shield. Further taps lead to an even greater flexibility of the transformer in terms of adaptation to different voltages. The displacement of several tap bushings in a common implementation with the connection solves this occurring space problems.
a contact point connected to the connection inner conductor of the support insulator and, for each of the tapping inner conductors, a contact point connected to the respective tapped inner conductor are arranged at an outer end of the support insulator.
the connecting lines between contact point and terminal and taps are arranged fan-shaped.
the external wiring can remain firmly connected to the central contact point while only making a straight, conductive connection from the central contact point to the contact point of the terminal or one of the contact points of the tapping terminals got to. This allows in particular a simple change during operation.
An insulating material is advantageously arranged between the contact points, so that the electrical separation is optimized.
the implementation system comprises a disk-shaped shielding ring, which is made of an insulating material and surrounds the support insulator flush. Because of the risk of breakdown on the outside of the dry-type transformer, a large distance must be maintained between the outer terminal and the tapping terminals on the post insulator and the shielding. This requires the use of correspondingly long post insulators that project far out of the shield on the outside. By a disc-shaped shielding ring shorter distance between the outer terminal and shield can be realized and thus a shorter support insulator can be used. The shield surrounds the support insulator flush. As a result, on the one hand a complete, electrically sealed insulation is achieved for shielding, which is easy to fasten on the other hand.
the shielding ring is advantageously circular-disk-shaped in order to ensure sufficient insulation in all spatial directions.
the shielding ring more than three times the diameter of the post insulator. This refers to the implementation system seen from the axial direction of the post insulator.
the shielding ring thus extends from the edge of the support insulator in each radial direction at least over a further diameter of the support insulator.
the shielding ring tapers towards its outer edge. Namely, with increasing distance from the inner conductor of the post insulator, the distance of a point on the surface of the shield extends to the terminal on the post insulator, so that a smaller insulating thickness is required.
the tapering makes the shielding ring lighter and therefore more mechanically stable.
the shielding ring is made of cast resin.
Cast resin has the advantage that it can be completely flexibly formed by the liquid processing is.
the shielding ring can thus be poured in a simple manner in a mold.
casting resin 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 feed-through system arranged in a connection opening of the grounded shield.
the shielding ring is arranged on the outside of the grounded shield, which encloses a leg of the dry-type transformer.
the tapping inner conductors are connected to a winding in the region of the winding of the dry transformer associated with the connecting inner conductor.
the taps are arranged in the region of the end of the winding, i. H. near the winding associated with the connection of the transformer. This ensures that the taps are at a similar potential as the connection.
tapping inner conductor and connecting inner conductor have a relative potential difference of less than 10%. This ensures that the guided through the common post insulator of taps and connection have only a small potential difference and breakdowns are avoided.
a trained according to the aforementioned type dry transformer is advantageously designed for a rated voltage of more than 1 kV and / or a rated power of more than 50 kVA.
a rated voltage of more than 1 kV and / or a rated power of more than 50 kVA is advantageously designed for a rated voltage of more than 1 kV and / or a rated power of more than 50 kVA.
the dry-type transformer is advantageously designed as a cast-resin transformer, d. H.
the insulation of the high voltage windings consists of cast resin.
the advantages achieved by the invention are in particular that by carrying out the taps and the connections in a common post insulator of a dry transformer, a significant space savings can be achieved and thereby the dry-type transformer can be used much more flexible in terms of its installation location.
the implementation system 1 described below is designed for cast resin transformers with a rated voltage of more than 1 kV and / or a rated power of more than 50 kVA and thus has a corresponding size. It is thus 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.
Central, supporting component is a circular cylindrical support insulator 2 (support), parallel to the axis of an electrical connection inner conductor 4 and spaced apart a total of four electrical tapping inner conductor are arranged.
the support insulator On the outside, the support insulator has a flange 6 at some distance from its outer end.
the remaining part of the post insulator 2 is made of an insulating material known to those skilled in the art.
Terminal inner conductor 4 and tapping inner conductor 5 are in a common area, i. H. only a few turns apart connected to a winding of the transformer.
the connection is designed in such a way that the tapping inner conductors 5 have a relative potential difference of -5%, -2.5%, +2.5% and +5% to the connection inner conductor 4.
the support insulator 2 essentially serves to allow electrical contact with the wire windings in the interior of the transformer. These are in fact surrounded by a grounded, metallic shield, which is applied as conductive earth covering 8 on the molded resin with spool 6. This has on the support insulator 2 a circular opening, whose diameter corresponds substantially to the outer diameter of the support insulator 2.
the support insulator is made in one piece with the coil 6 as casting of resin and is like the coil 6 partially covered by a layer of earth 8, which extends along the shell of the support insulator 2 over a short distance up to an O-ring 10 extending in a groove extends in a circle around the entire support insulator 2.
the O-ring 10 is made of a conductive material.
the shielding ring 14 has an inner cylinder jacket-shaped opening whose inner diameter in Substantially corresponds to the outer diameter of the support insulator 2 in the tapered portion 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 shield ring 14 at its central opening is only slightly smaller than the axial length of the tapered portion 12 of the support insulator 2.
the shield ring 14 is tapered in its thickness. It is made entirely of cast resin.
terminal inner conductor 4 and tapping inner conductor 5 are connected to exposed contact points 16. These are only covered by a cap 18. Location and arrangement of the contact points 16 are described below with reference to the FIG. 1 and the FIG. 2 described.
FIG. 2 shows the implementation system 1 from direction A, ie axially from the outside, below the cap 18. It can be seen the circular diameter of the shield 14 and the support insulator 2. Furthermore, the end base of the support insulator 2 is shown.
a central contact point 20 is arranged on the end base. This is provided only superficially and there is no inner conductor connects directly to this contact point 20 at.
an external cable 24 with insulation 26 is fastened by means of a screw 22 through the cap 18.
the contact points 16 are arranged with mutually uniform spacing radially around the central contact point 20 around on the end base, ie the connecting lines between each of the contact points 16 and the central Contact point 20 form a uniform fan. Between the contact points 16 raised walls 28 are arranged made of insulating material, which are designed in one piece with the cap 18.
a metal rod 30 in the length of the distance between contact points 16 and central contact point 20 By a metal rod 30 in the length of the distance between contact points 16 and central contact point 20, a connection from the central contact point 20 and thus from the cable 24 to one of the contact points 16, d. H. be made either to one of the tapping inner conductor 5 or the terminal inner conductor 4. The remaining possible positions of the metal rod 30 are shown in dashed lines.
FIG. 3 finally shows a dry-type transformer 38, which is designed as a cast-resin transformer. He has an iron core layered from electrical sheets.
the iron core of the dry-type transformer 38 has three legs, which are parallel to one another and wound with wire windings, which are each surrounded by a cylindrical jacket-shaped, grounded shield 40. The legs are connected at their ends by yokes 42 with each other.
connection openings for connections and taps of the internal wire windings in the shield 40, which are formed with the implementation system 1 described above.
the connection openings lie in each case in the middle in the upper and lower half of the legs.

Landscapes

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

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 true EP3001433A1 (fr)	2016-03-30
EP3001433B1 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

Country Status (2)

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

Citations (2)

* 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
US3611132A (en) *	1969-09-30	1971-10-05	Westinghouse Electric Corp	Plug-in electrical bushing

Family Cites Families (3)

* 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
US2997676A (en) *	1960-01-25	1961-08-22	Westinghouse Electric Corp	Electrical inductive apparatus
DE2938792C2 (de) *	1979-09-25	1983-04-14	Transformatoren Union Ag, 7000 Stuttgart	Einphasen-Transformator mit in Gießharz vergossenen Wicklungen

2014
- 2014-09-29 EP EP14186829.9A patent/EP3001433B1/fr active Active
2015
- 2015-09-17 WO PCT/EP2015/071285 patent/WO2016050522A1/fr not_active Ceased

Patent Citations (2)

* 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
US3611132A (en) *	1969-09-30	1971-10-05	Westinghouse Electric Corp	Plug-in electrical bushing

Also Published As

Publication number	Publication date
WO2016050522A1 (fr)	2016-04-07
EP3001433B1 (fr)	2023-05-24

Publication	Publication Date	Title
DE69728972T2 (de)	2005-05-04	Transformator/reactor
EP2636113B1 (fr)	2017-08-02	Système de blindage électrique pour une interface d'une ligne pour transmission d'électricité en courant continu à haute tension
EP2428967B1 (fr)	2013-04-17	Enroulement de transformateur
EP0102513A1 (fr)	1984-03-14	Transformateur à sec avec enroulements fondus dans une résine de coulée
DE1613798A1 (de)	1971-05-06	Hochspannungs-Stromwandler
DE2002192B2 (de)	1972-05-18	Transformator, drosselspule oder dgl. induktionsgeraete fuer hohe betriebsspannung
EP3001435B1 (fr)	2017-11-15	Noyau de transformateur à sec
EP2661756A1 (fr)	2013-11-13	Enroulement de transformateur doté d'un canal de refroidissement
EP3577664B1 (fr)	2020-12-16	Dispositif électrique avec une réservoir d'une forme complémentaire à la partie active
CH322444A (de)	1957-06-15	Metallgekapselte elektrische Hochspannungs-Schaltanlage
WO2015150005A1 (fr)	2015-10-08	Commutateur en charge de transformateur à sec
DE683018C (de)	1939-10-27	Einleiterstromwandler mit zweiteiligem Durchfuehrungsisolator
EP2846336B1 (fr)	2016-05-04	Connexion d'au moins quatre conducteurs électriques
EP3001437B1 (fr)	2019-11-13	Système d'exécution
DE69012258T2 (de)	1995-04-13	Barriere des Kondensatortyps.
EP3001433B1 (fr)	2023-05-24	Support isolant de connection électrique adapté a un transformateur
WO2009146835A2 (fr)	2009-12-10	Transformateur
DE2154398C3 (de)	1979-10-04	Spannungstransformator zur vertikalen Aufstellung mit einem gestreckten Magnetkern
EP3093938B1 (fr)	2021-07-14	Système d'exécution haute tension
EP3577665B1 (fr)	2022-06-15	Partie active pour un appareil électrique à haute tension
EP3076409B1 (fr)	2017-12-13	Connexion électrique d'enroulements écartés les uns des autres
EP3979278B1 (fr)	2024-04-17	Module de transformateur de courant pour une installation de commutation et installation de commutation correspondante
EP3685411B1 (fr)	2021-08-11	Agencement d'enroulement
EP2924698B1 (fr)	2018-11-21	Passage huile-huile et transformateur à huile
DE102017204930B4 (de)	2021-06-10	Elektrisches Gerät zum Anschluss an ein Hochspannungsnetz

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