EP0025951B1 - Single-phase transformer having windings encapsulated in resin - Google Patents

Single-phase transformer having windings encapsulated in resin Download PDF

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Publication number
EP0025951B1
EP0025951B1 EP80105468A EP80105468A EP0025951B1 EP 0025951 B1 EP0025951 B1 EP 0025951B1 EP 80105468 A EP80105468 A EP 80105468A EP 80105468 A EP80105468 A EP 80105468A EP 0025951 B1 EP0025951 B1 EP 0025951B1
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EP
European Patent Office
Prior art keywords
flanges
cast
winding
parallel
resin
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Expired
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EP80105468A
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German (de)
French (fr)
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EP0025951A1 (en
Inventor
Gerhard Dipl.-Ing. Altmann
Richard Dr. Pfeiffer
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Transformatoren Union AG
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Transformatoren Union AG
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Priority to AT80105468T priority Critical patent/ATE5924T1/en
Publication of EP0025951A1 publication Critical patent/EP0025951A1/en
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Publication of EP0025951B1 publication Critical patent/EP0025951B1/en
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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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/327—Encapsulating or impregnating
    • 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
    • H01F27/022—Encapsulation
    • 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 single-phase transformer with a winding core made of strip material and windings cast in cast resin, for example for installation on masts or directly in the earth in the course of 'underground cables.
  • a transformer with windings cast in cast resin is known from DE-B-1 140 988.
  • an iron core provided with exposed yoke legs, layered from individual sheets and the windings on their outer sheath and attached to the yoke legs serve as a casting mold.
  • the shells are longer in the axial direction of the windings than the latter, so that the end faces of the windings are covered by the encapsulation with flanges made of cast resin that are perpendicular to the winding axis.
  • DE-A-28 26 299.9 also proposes a multi-phase transformer, the windings and three-legged layer core of which are hermetically sealed by encapsulation with synthetic resin and which can be buried by appropriate equipment with connecting sockets and connected to underground cables.
  • This structure with a multi-legged core is very advantageous for a multi-phase transformer to be cast in synthetic resin, but when used on single-phase transformers it requires considerable effort in terms of the amount of material of the casting resin required as soon as the core is hermetically sealed due to the mostly unwrapped yoke leg should.
  • the invention is therefore based on the object of providing an arrangement of windings and cores for a single-phase transformer with a hermetically encapsulated active part which can be produced with normal production outlay without impairing operational reliability and in which the quantities of material used are fully utilized according to their properties.
  • this object is for a single-phase transformer with a winding core.
  • Made from strip material in that when the windings are cast around parallel to the winding axis and parallel to the side walls of a shaft -like window with rectangular cross-section penetrated by the winding core , two flanges lying opposite one another are cast on, such that the inner sides of these flanges, which are also parallel to one another, are approximately in the plane of the end faces of the Winding cores are located in the inner sides of these flanges in the vicinity of the outer edge and parallel to this there are grooves for anchoring an encapsulation for the winding core, that the surface of the cast resin body carries an earthed metallization at least on the surfaces directly opposite the winding core and that after the Inserting the winding core between the flanges remaining space is potted with casting resin.
  • connection sockets for touch-proof, waterproof high-voltage cable plugs and bolts for the undervoltage connections which are also watertightly insulated in heat-shrinkable tubing technology, are cast on the outside of the flanges or that support-like bushings for the top and bottom connections are used on the outside of the flanges for use as a mast transformer are. It is also expedient that the gaps between the metallized surface of the synthetic resin body and the winding core are filled with dried quartz sand.
  • the arrangement according to the invention is very advantageous for the construction of hermetically encapsulated single-phase transformers, because it enables the use of very low-loss winding cores and requires only relatively little synthetic resin for the encapsulation of the core and is therefore economically usable.
  • Windings 2 arranged around a vertical axis are encapsulated with synthetic resin and thereby completely encapsulated towards the outside.
  • This synthetic resin casting of the windings 2 is expanded on two opposite sides to axially parallel and also mutually parallel flanges 3.
  • the windings 2 consist of at least one, preferably internal, undervoltage winding and a radially further external high-voltage winding.
  • a central, shaft-like window parallel to the winding axis is recessed in the cast resin in the cast resin casting.
  • Two winding cores 1 of strip material arranged symmetrically to one another are layered. Each of these winding cores 1 encloses the windings 2 on its own and lies between the flanges 3.
  • at least the surfaces of the synthetic resin encapsulation that lie directly between the windings 2 on the one hand and the winding cores 1 on the other are provided with a metallized surface 4 and are electrically conductive connected to an earth conductor.
  • this depression is also filled all around with a casting resin layer 10 in a new casting process.
  • grooves 5 are provided on the inside of the flanges 3 in the vicinity of the edges thereof.
  • the transformer which is now completely smooth-walled on the outside, is provided with corrosion protection and electrically effective shielding layers, depending on the intended use.
  • the circumferential recess between the flanges 3 can also be filled by wrapping the winding cores 1 with a band 6 of shrinkable material.
  • a band 6 of shrinkable material in particular the corners of the flanges 3 are rounded off so that after wrapping the shrinkable tape 6 there is a step-free end jacket for the in turn cuboidal transformer.
  • the shrinkable band 6 it is expedient in many cases to enclose this arrangement with a bandage 7, the bandage 7 contributing above all to improving the corrosion protection.
  • Fig. 3 now shows a correspondingly supplemented cast resin transformer in a touch-proof, buried in the ground version.
  • connection sockets 8 are provided in a watertight design.
  • the low-voltage connection is made via bolts 9, the shrink tube technology being particularly suitable for insulation.
  • Fig. 4 shows a variation of the transformer according to the invention for installation on overhead line pylons, the electrical connection being made via support-like bushings 11.

Abstract

Single-phase transformer, including windings being wound around an axis and cast in resin forming a cast resin body, the cast resin winding body having an outer surface and a rectangular window formed therein with sides disposed in given planes, a wound core formed of tape material extended through the window, two flanges being cast with and integral with the cast resin winding body on opposite sides thereof and parallel to the winding axis and to the window, the flanges having outer edges, mutually parallel inner surfaces substantially disposed in the plane of the narrow sides of the window and grooves formed in the inner surfaces in the vicinity of and parallel to the outer edges, an encapsulation for the wound core being anchored in the grooves, and a grounded metallization layer formed on the outer surface of the cast resin winding body at least immediately adjacent to the wound core.

Description

Die Erfindung betrifft einen Einphasen-Transformator mit Wickelkern aus Bandwerkstoff und in Gießharz vergossenen Wicklungen, beispielsweise zur Installation auf Masten oder unmittelbar im Erdbereich im Zuge von' Erdkabeln.The invention relates to a single-phase transformer with a winding core made of strip material and windings cast in cast resin, for example for installation on masts or directly in the earth in the course of 'underground cables.

Ein Transformator mit in Gießharz vergossenen Wicklungen ist aus der DE-B-1 140 988 bekannt. Bei diesem Transformator dienen ein mit offenliegenden Rückschlußschenkeln versehener, aus Einzelblechen geschichteter Eisenkern und die Wicklungen auf deren Außenmantel umschließende, an den Rückschlußschenkeln befestigte Schalen als Gießform. Die Schalen sind in Achsrichtung der Wicklungen länger als letztere, so daß die Stirnseiten der Wicklungen durch den Verguß mit senkrecht auf der Wickelachse stehenden Flanschen aus Gießharz abgedeckt sind.A transformer with windings cast in cast resin is known from DE-B-1 140 988. In this transformer, an iron core provided with exposed yoke legs, layered from individual sheets and the windings on their outer sheath and attached to the yoke legs serve as a casting mold. The shells are longer in the axial direction of the windings than the latter, so that the end faces of the windings are covered by the encapsulation with flanges made of cast resin that are perpendicular to the winding axis.

Derartige mit in Gießharz vergossenen Wicklungen ausgerüstete Transformatoren werden in neuerer Zeit, insbesondere wegen ihrer sehr guten Betriebssicherheit, in wachsendem Maße als Verteilungstransformatoren eingesetzt. In DE-A-28 26 299.9 wird auch schon ein Mehrphasen-Transformator vorgeschlagen, dessen Wicklungen und dreischenkliger Schichtkern durch Umgießen mit Kunstharz hermetisch abgeschlossen sind und der durch entsprechende Ausrüstung mit Anschlußbuchsen vergrabbar und an Erdkabel anschließbar ist.Such transformers equipped with cast resin encapsulated castings have recently been used increasingly as distribution transformers, in particular because of their very good operational reliability. DE-A-28 26 299.9 also proposes a multi-phase transformer, the windings and three-legged layer core of which are hermetically sealed by encapsulation with synthetic resin and which can be buried by appropriate equipment with connecting sockets and connected to underground cables.

Dieser Aufbau mit Mehrschenkelkern ist zwar für einen in Kunstharz einzugießenden Mehrphasen-Transformator sehr vorteilhaft, erfordert jedoch bei seiner Anwendung auf Einphasen-Transformatoren infolge des dort erforderlichen, meist unbewickelten Rückschlußschenkels einen erheblichen Aufwand bezüglich der Werkstoffmenge des erferderliehen Gießharzes, sobald der Kern hermetisch abgeschlossen werden soll.This structure with a multi-legged core is very advantageous for a multi-phase transformer to be cast in synthetic resin, but when used on single-phase transformers it requires considerable effort in terms of the amount of material of the casting resin required as soon as the core is hermetically sealed due to the mostly unwrapped yoke leg should.

Der Erfindung liegt daher die Aufgabe zugrunde, für einen Einphasen-Transformator mit hermetisch abgekapseltem Aktivteil eine Anordnung von Wicklungen und Kernen zu schaffen, die ohne Beeinträchtigung der Betriebssicherheit mit normalem Fertigungsaufwand herstellbar ist und in der die eingesetzten Werkstoffmengen entsprechend ihren Eingenschaften voll ausgenutzt werden.The invention is therefore based on the object of providing an arrangement of windings and cores for a single-phase transformer with a hermetically encapsulated active part which can be produced with normal production outlay without impairing operational reliability and in which the quantities of material used are fully utilized according to their properties.

Erfindungsgemäß wird diese Aufgabe für einen Einphasen-Transformator mit Wickelkern. aus Bandwerkstoff dadurch gelöst, daß beim Umgießen der Wicklungen parallel zur Wickelachse und parallel zu Seitenwänden eines vom Wickelkern durchsetzten Schachtähn-lichen Fensters mit rechteckigem Querschnitt zwei sich gegenüberliegende Flansche angegossen sind, daß die Innenseiten dieser auch zueinander parallelen Flansche etwa in der Ebene der Stirnseiten der Wickelkerne liegen, daß in den Innenseiten dieser Flansche in der Nähe des äußeren Randes und parallel hierzu Nuten zur Verankerung einer Kapselung für den Wickelkern liegen, daß die Oberfläche des Gießharzkörpers mindestens an den dem Wickelkern unmittelbar gegenüberliegenden Flächen eine geerdete Metallisierung trägt und daß der nach dem Einbringen des Wickelkernes zwischen den Flanschen verbleibende Raum mit Gießharz vergossen ist.According to the invention, this object is for a single-phase transformer with a winding core. Made from strip material in that when the windings are cast around parallel to the winding axis and parallel to the side walls of a shaft -like window with rectangular cross-section penetrated by the winding core , two flanges lying opposite one another are cast on, such that the inner sides of these flanges, which are also parallel to one another, are approximately in the plane of the end faces of the Winding cores are located in the inner sides of these flanges in the vicinity of the outer edge and parallel to this there are grooves for anchoring an encapsulation for the winding core, that the surface of the cast resin body carries an earthed metallization at least on the surfaces directly opposite the winding core and that after the Inserting the winding core between the flanges remaining space is potted with casting resin.

Nach zweckmäßigen Ausgestaltungen ist vorgesehen, daß auf den Außenseiten der Flansche Anschlußbuchsen für berührungssichere wasserdichte Oberspannungskabelstecker und Bolzen für die in Schrumpfschlauchtechnik ebenfalls wasserdicht isolierten Unterspannungsanschlüsse angegossen sind oder daß zur Verwendung als Masttransformator auf den Außenseiten der Flansche stützerähnliche Durchführungen für die ober-und unterspannungsseitigen Netzanschlüsse angegossen sind. Dabei ist es weiterhin zweckmäßig, daß die Spalte zwischen der metallisierten Oberfläche des Kunstharzkörpers und dem Wickelkern mit getrocknetem Quarzsand gefüllt sind.According to expedient refinements, it is provided that connection sockets for touch-proof, waterproof high-voltage cable plugs and bolts for the undervoltage connections, which are also watertightly insulated in heat-shrinkable tubing technology, are cast on the outside of the flanges or that support-like bushings for the top and bottom connections are used on the outside of the flanges for use as a mast transformer are. It is also expedient that the gaps between the metallized surface of the synthetic resin body and the winding core are filled with dried quartz sand.

Die erfindungsgemäße Anordnung ist für den Aufbau von hermetisch zu kapselnden Einphasen-Transformatoren sehr vorteilhaft, denn sie ermöglicht die Verwendung von sehr verlustarmen Wickelbandkernen und fordert nur verhältnismäßig wenig Kunstharz für den Umguß des Kernes und ist daher wirtschaftlich einsetzbar.The arrangement according to the invention is very advantageous for the construction of hermetically encapsulated single-phase transformers, because it enables the use of very low-loss winding cores and requires only relatively little synthetic resin for the encapsulation of the core and is therefore economically usable.

Der prinzipielle Aufbau des erfindungsgemäßen Transformators und zwei Ausführungsbeispiele werden anhand einer Zeichnung näher erläutert.The basic structure of the transformer according to the invention and two exemplary embodiments are explained in more detail with reference to a drawing.

  • Fig. 1 zeigt in perspektivischer Darstellung teilweise aufgeschnitten eine Anordnung mit vollkommen umgossenem Bandwickelkern,1 shows a perspective view, partially cut away, of an arrangement with a completely cast tape winding core,
  • Fig. 2 zeigt eine Anordnung mit zum Abschluß des Aktivteiles verwendeten Bändern aus schrumpffähigem Werkstoff,2 shows an arrangement with tapes made of shrinkable material used to terminate the active part,
  • Fig. 3 zeigt eine zum Vergraben vorgesehene Ausführungsform und3 shows an embodiment provided for burying and
  • Fig. 4 eine zur Montage auf Freileitungsmasten vorgesehene Ausführungsform der erfindungsgemäßen Einphasen-Transformatoren.Fig. 4 shows an embodiment of the single-phase transformers according to the invention intended for mounting on overhead line pylons.

Um eine senkrechte Achse angeordnete Wicklungen 2 sind mit Kunstharz umgossen und dadurch nach außen hin vollständig gekapselt. Dieser Kunstharzguß der Wicklungen 2 ist auf zwei sich gegenüberliegenden Seiten zu achsparallel und auch untereinander parallelen Flanschen 3 erweitert. Die Wicklungen 2 bestehen mindestens aus einer, vorzugsweise innenliegenden, Unterspannungswicklung und einer radial weiter ausßenliegenden Oberspannungswicklung.Windings 2 arranged around a vertical axis are encapsulated with synthetic resin and thereby completely encapsulated towards the outside. This synthetic resin casting of the windings 2 is expanded on two opposite sides to axially parallel and also mutually parallel flanges 3. The windings 2 consist of at least one, preferably internal, undervoltage winding and a radially further external high-voltage winding.

Innerhalb der Wicklungen 2 ist in dem Gießharzumguß ein zur Wickelachse paralleles, zentrisches, schachtähnliches Fenster in dem Kunstharzumguß ausgespart. In dieses Fenster sind zwei symmetrisch zueinander angeordnete Wickelkerne 1 aus Bandwerkstoff eingeschichtet. Jeder dieser Wickelkerne 1 umschließt für sich allein die Wicklungen 2 und liegt dabei zwischen den Flanschen 3. Zur Verbesserung der Spannungsfestigkeit sind mindestens die unmittelbar zwischen den Wicklungen 2 einerseits und den Wickelkernen 1 andererseits liegenden Oberflächen des Kunstharzumgusses mit einer metallisierten Oberfläche 4 versehen und elektrisch leitend mit einem Erdungsleiter verbunden.Within the windings 2, a central, shaft-like window parallel to the winding axis is recessed in the cast resin in the cast resin casting. In this window Two winding cores 1 of strip material arranged symmetrically to one another are layered. Each of these winding cores 1 encloses the windings 2 on its own and lies between the flanges 3. To improve the dielectric strength, at least the surfaces of the synthetic resin encapsulation that lie directly between the windings 2 on the one hand and the winding cores 1 on the other are provided with a metallized surface 4 and are electrically conductive connected to an earth conductor.

Die Wicklungen 2 bilden zusammen mit ihrem Kunstharzumguß und den hierin eingeschachtelten Wickelkernen 1 annähernd einen Quader mit einer zwischen den Flanschrändern umlaufenden Vertiefung. Um auch die Wickelkerne 1 nach außen hin abzuschließen und dadurch vor Korrosion und vor mechanischer Beschädigung zu schützen wird in einem erneuten Gießvorgang diese Vertiefung rundum ebenfalls mit einer Gießharzschicht 10 ausgefüllt. Zur Verankerung dieser Gießharzschicht 10 sind auf der Innenseite der Flansche 3 in der Nähe von deren Rändern Nuten 5 vorgesehen. Der nach außen hin nunmehr vollständig glattwandige Transformator wird je nach Verwend-' ungszweck mit Korrosionsschutz und elektrisch wirksamen Abschirmschichten versehen.The windings 2, together with their synthetic resin encapsulation and the winding cores 1 nested therein, form approximately a cuboid with a recess running between the flange edges. In order to also seal the winding cores 1 from the outside and thereby protect them from corrosion and mechanical damage, this depression is also filled all around with a casting resin layer 10 in a new casting process. In order to anchor this cast resin layer 10, grooves 5 are provided on the inside of the flanges 3 in the vicinity of the edges thereof. The transformer, which is now completely smooth-walled on the outside, is provided with corrosion protection and electrically effective shielding layers, depending on the intended use.

Anstelle einer Gießharzschicht 10 um die Wickelkerne 1 nach der Erfindung kann die umlaufende Vertiefung zwischen den Flanschen 3 auch durch Umwickeln der Wickelkerne 1 mit einem Band 6 aus schrumpffähigem Werkstoff ausgefüllt werden. Bei dieser Ausführungsform werden insbesondere die Ecken der Flansche 3 so abgerundet, daß sich nach dem Einwickeln des schrumpffähigen Bandes 6 ein absatzfreier Abschlußmantel für den wiederum quaderförmigen Transformator ergibt. Zusätzlich zu dem schrumpffähigen Band 6 ist es in vielen Fällen zweckmäßig, diese Anordnung durch eine Bandage 7 zu umschließen, wobei die Bandage 7 vor allem zur Verbesserung des Korrosionsschutzes beiträgt.Instead of a cast resin layer 10 around the winding cores 1 according to the invention, the circumferential recess between the flanges 3 can also be filled by wrapping the winding cores 1 with a band 6 of shrinkable material. In this embodiment, in particular the corners of the flanges 3 are rounded off so that after wrapping the shrinkable tape 6 there is a step-free end jacket for the in turn cuboidal transformer. In addition to the shrinkable band 6, it is expedient in many cases to enclose this arrangement with a bandage 7, the bandage 7 contributing above all to improving the corrosion protection.

In Fig. 1 und 2 wurden der Übersichtlichkeit halber zum Anschluß der Transformatoren an ein Netz erforderliche Hilfsmittel nicht dargestellt.1 and 2, for the sake of clarity, the aids required for connecting the transformers to a network have not been shown.

Fig. 3 zeigt nun einen entsprechend ergänzten Gießharz-Transformator in einer berührungssicheren, in den Erdboden eingrabbaren Ausführung. Zum oberspannungsseitigen Anschluß dieses Transformators sind Anschlußbuchsen 8 in wasserdichter Ausführung vorgesehen. Der unterspannungsseitige Anschluß erfolgt über Bolzen 9, wobei zur Isolierung insbesondere die Schrumpfschlauchtechnik geeignet ist.Fig. 3 now shows a correspondingly supplemented cast resin transformer in a touch-proof, buried in the ground version. For the high-voltage side connection of this transformer, connection sockets 8 are provided in a watertight design. The low-voltage connection is made via bolts 9, the shrink tube technology being particularly suitable for insulation.

Fig. 4 zeigt eine Variation des erfindungsgemäßen Transformators zur Aufstellung auf Freileitungsmasten, wobei der elektrische Anschluß über stützerähnliche Durchführungen 11 erfolgt.Fig. 4 shows a variation of the transformer according to the invention for installation on overhead line pylons, the electrical connection being made via support-like bushings 11.

Claims (4)

1. A single-phase transformer having a winding core made of a strip material and having windings embedded in casting resin, characterised in
-that when embedding the windings (2) parallel to the winding axis and parallel to the side walls of a shaft-like window through which the winding cores (1) pass and which has a rectangular cross-section, two flanges (3), which lie opposite to one another, are cast on;
- that the inner sides of these flanges (3), which are also parallel to one another, are arranged approximately in the plane of the end faces of the cores (1);
- that in the inner sides of these flanges (3), in the vicinity of the outer edge and parallel thereto, grooves (5) are arranged which serve to anchor an encapsulation for the winding cores (1 );
- that the surface of the body of cast resin carries an earthed metallization (4), at least on the areas which are directly opposite to the winding cores (1); and
- that the space remaining after the winding cores (1) have been inserted between the flanges (3), is filled with a layer of casting resin (10), which is anchored in the grooves (5), so that the winding cores (1) are hermetically sealed, (Figure 1).
2. A single-phase transformer according to Claim 1, characterised in that, on the outer sides of the flanges (3), there are cast-on sockets (8) for shock-proof, water-proof high-voltage cable plugs, and bolts (9) for low-voltage terminals, which are also insulated so as to be water-proof using the shrunk-tube technique, (Figure 3).
3. A single-phase transformer according to Claim 1, characterised in that, for use as a pole- mounted transformer, post insulator-like bushings (11) for the supply connections at the high-voltage and low-voltage sides are cast onto the outer sides of the flanges (3), (Figure 4).
4. A single-phase transformer according to Claim 1, characterised in that the gap between the winding cores (1) and the metallized surfaces (4) of the resin body, which surrounds the windings (2), is filled with dried quartz sand.
EP80105468A 1979-09-25 1980-09-12 Single-phase transformer having windings encapsulated in resin Expired EP0025951B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80105468T ATE5924T1 (en) 1979-09-25 1980-09-12 SINGLE-PHASE TRANSFORMER WITH WINDINGS CAST IN RESIN.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2938792 1979-09-25
DE2938792A DE2938792C2 (en) 1979-09-25 1979-09-25 Single-phase transformer with cast resin cast windings

Publications (2)

Publication Number Publication Date
EP0025951A1 EP0025951A1 (en) 1981-04-01
EP0025951B1 true EP0025951B1 (en) 1984-01-18

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US (1) US4349801A (en)
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JP (1) JPS5655021A (en)
AT (1) ATE5924T1 (en)
BR (1) BR8006044A (en)
DE (1) DE2938792C2 (en)

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US4349801A (en) 1982-09-14
BR8006044A (en) 1981-04-07
JPS5655021A (en) 1981-05-15
EP0025951A1 (en) 1981-04-01
DE2938792A1 (en) 1981-03-26
ATE5924T1 (en) 1984-02-15
DE2938792C2 (en) 1983-04-14

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