EP0083736B1 - Transformer with copper coils - Google Patents

Transformer with copper coils Download PDF

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Publication number
EP0083736B1
EP0083736B1 EP82111268A EP82111268A EP0083736B1 EP 0083736 B1 EP0083736 B1 EP 0083736B1 EP 82111268 A EP82111268 A EP 82111268A EP 82111268 A EP82111268 A EP 82111268A EP 0083736 B1 EP0083736 B1 EP 0083736B1
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EP
European Patent Office
Prior art keywords
transformer
copper
store
windings
insulating material
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Expired
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EP82111268A
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German (de)
French (fr)
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EP0083736A1 (en
Inventor
Wolfgang Dr. Von Gentzkow
Hubert Deml
Karl Soldner
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Siemens AG
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Siemens AG
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Priority to AT82111268T priority Critical patent/ATE22364T1/en
Publication of EP0083736A1 publication Critical patent/EP0083736A1/en
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Publication of EP0083736B1 publication Critical patent/EP0083736B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/20—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils

Definitions

  • the invention relates to transformers with an electrical insulation of its windings made of copper profiles from electrically connected in series effective, solid and liquid insulating materials, of which the solid insulating materials consist predominantly of cellulose, of which the liquid insulating materials are represented by a transformer oil serving simultaneously as a cooling liquid and wherein a hydrazide is contained in the liquid insulating material.
  • the copper which dissolves and oxidizes during the transformer operation due to the influence of aging products of the oil and cellulose under reducing conditions as predominantly metallic copper with weakening or even damage to the insulation, for example on insulating parts.
  • Another method of preventing the oxidation and dissolution of copper by the transformer oil is to add stabilizing additives to the transformer oil.
  • stabilizing additives for example, 2,6-di-tert-butyl-p-cresol is suitable, which acts as an oxidation inhibitor when dissolved in the oil.
  • a disadvantage of this solution is that, in order to be effective, such oxidation inhibitors must be completely dissolved in the transformer oil in relatively large amounts.
  • JP-A 75105559 discloses the use of oxalic acid hydrazides for protecting hydrocarbon oils against metal-induced degradation. Similar hydrazides are also described according to DE-A 2403064 as inhibitors against the copper-induced degradation of polyolefins. However, these known applications limit the use of hydrazides to a particular type of insulation material and do not allow any conclusions to be drawn about the behavior with respect to a combination of different types of insulation material.
  • the invention is therefore based on the object of providing a method for transformers by which the dissolution and absorption of copper by the transformer oil is reliably prevented in an economical manner, so that even if there is direct contact between the copper conductors and the transformer oil there is no oxidative aging as a result is caused, at the same time a deposition of copper on the solid insulating material should be avoided.
  • the depot filling consists of crystalline copper deactivator and a transformer tank containing the windings and the insulating materials is hermetically sealed from the outside air.
  • one or more oxidation inhibitors for example 2,6-di-tert.butyl-p-cresol, have been introduced into the liquid insulating material and / or into the depot, and the depot is complete holding a bag made of a fine-meshed, oil and heat stable, aging-resistant material, such as glass or stainless steel.
  • the bag is expediently arranged in the coolant circuit above the windings, on the cover of the transformer tank, and its contents can be checked during the entire operating time of the transformer.
  • copper deactivators according to the invention is very advantageous, since they already work in small quantities and, although they have not been detectable in transformer oil so far, surprisingly retard the aging of the insulating agent system consisting of transformer oil and cellulose in contact with the transformer oil.
  • the use of these copper deactivators in combination with one or more oxidation inhibitors brings a further advantageous delay in the aging of the insulation system.
  • a core 12 is installed in an oil-filled boiler 9 for a transformer.
  • the core leg 12 is of an internal undervoltage winding 7 and a radial white the outer high-voltage winding 5 surrounded.
  • the undervoltage winding 7 is electrically insulated from shielding barriers 6 and the high-voltage winding 5 by shielding barriers 4 made of a solid cellulosic material.
  • Both the low-voltage winding 7 and the high-voltage winding 5 are supported on a winding support table 3, which in turn is supported by a press frame 1 via supports 2.
  • the arrangement of the press frame 1, the supports 2 and the winding table 3 is used in conjunction with corresponding components (not shown) on the top of the windings 5 and 7 for pressing the same in the axial direction and for fixing them to the core 12.
  • the press frame 1 is hollow and at the same time serves as a coolant supply pipe due to its connection to a pipe 15 coming from a cooler 10.
  • Channels 13 and 14 in the supports 2 serve to guide the coolant in the direction of the arrows 8.
  • the flow rate of the coolant in the direction of the arrows 8 is set by a pump 11.
  • the coolant After its exit from the upper ends of the winding, the coolant passes a depot 16 on its way in the direction of the arrows 8 before it enters the pipeline 15 to the pump 11.
  • the depot 16 is permanently installed in the upper part of a side wall of the boiler 9 and is delimited by sieves 17 both towards the interior of the boiler 9 and in the direction of the pipeline 15.
  • the screens 17 keep a supply of a copper deactivator, for example N, N '-bis-salicyloyl hydrazine, in the flow of the coolant.
  • an oxidation inhibitor is also added to the copper deactivator, for example 2,6-di-tert-butyl-p-cresol. The supply and the appearance of the copper deactivator and the oxidation inhibitor can be checked from outside through a window 18 in the operating state.
  • FIG. 2 shows a transformer with a cooler 10 set up a little further away from its boiler 9.
  • the boiler 9 and the cooler 10 are connected to one another by pipes 15 and the coolant flow is regulated in the direction of the arrows by a pump 11 arranged at the inlet into the cooler 10 8 driven.
  • the pipeline 15 is divided into two parallel branches in this exemplary embodiment, each of which can carry the entire coolant flow on its own.
  • the depot 16 is located between two slides 19 and in the other branch only one slider 19 is arranged.
  • the branch containing the depot 16 guides the entire coolant flow.
  • the slide 19 in the branch that leads past the depot is first opened before the slide at the inlet and outlet of the depot 16 is closed. Thereafter, the depot 16 can be opened or dismantled without interrupting the operation of the transformer. Before the depot 16 is put back into operation, it is evacuated and the resulting vacuum is filled with transformer oil.
  • the depot 16 is expediently accommodated in a chamber hanging under the boiler cover. In operation, this chamber is open to the interior of the boiler, so that transformer oil flows through the depot. The chamber opposite the boiler interior can be locked for inspection and maintenance work on the depot.

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Transformer Cooling (AREA)
  • Housings And Mounting Of Transformers (AREA)

Description

Die Erfindung betrifft Transformatoren mit einer elektrischen Isolierung seiner aus Kupferprofilen aufgebauten Wicklungen aus elektrisch in Reihe geschaltet wirksamen, festen und flüssigen Isolierwerkstoffen, von denen die festen lsolierwerkstoffe überwiegend aus Zellulose bestehen, von denen die flüssigen Isolierwerkstoffe von einem gleichzeitig als Kühlflüssigkeit dienenden Transformatoröl dargestellt sind und wobei in dem flüssigen Isolierwerkstoff ein Hydrazid enthalten ist.The invention relates to transformers with an electrical insulation of its windings made of copper profiles from electrically connected in series effective, solid and liquid insulating materials, of which the solid insulating materials consist predominantly of cellulose, of which the liquid insulating materials are represented by a transformer oil serving simultaneously as a cooling liquid and wherein a hydrazide is contained in the liquid insulating material.

Untersuchungen an Transformatoren mit Wicklungen aus Kupferprofilen haben gezeigt, dass sowohl metallisches Kupfer als auch im Öl gelöstes Kupfer Katalysatoren für die thermisch oxidative Alterung von Öl und Zellulose sind. Durch diese oxidative Alterung wird die Lebensdauer von Transformatoren, insbesondere von solchen mit hoher Verlustwärme, alterungsbedingt begrenzt.Studies on transformers with windings made of copper profiles have shown that both metallic copper and copper dissolved in oil are catalysts for the thermal oxidative aging of oil and cellulose. This oxidative aging limits the service life of transformers, particularly those with high heat loss, due to aging.

Ausserdem kann das während des Transformatorbetriebes durch den Einfluss von Alterungsprodukten des Öls und der Zellulose sich lösende und oxidierte Kupfer unter reduzierenden Bedingungen als überwiegend metallisches Kupfer unter Schwächung oder sogar Schädigung der Isolierung, beispielsweise auf Isolierteilen, abgeschieden werden.In addition, the copper which dissolves and oxidizes during the transformer operation due to the influence of aging products of the oil and cellulose under reducing conditions as predominantly metallic copper with weakening or even damage to the insulation, for example on insulating parts.

Eine Möglichkeit zur Verhinderung der Lösung von Kupfer aus der Wicklung und aus deren Ausleitungen durch Transformatoröl besteht in dem Abdecken der freien Kupferoberflächen durch Lackieren. Dieses Verfahren wird zwar angewendet, ist jedoch fertigungstechnisch aufwendig. Eine weitere Möglichkeit zur Abdeckung der Kupferoberflächen besteht in deren Vernickeln. Dieses Verfahren ist jedoch noch unwirtschaftlicher als die Lackierung der freien Kupferoberflächen.One way to prevent copper from coming out of the winding and being rejected by transformer oil is to cover the free copper surfaces by painting. Although this method is used, it is complex to manufacture. Another possibility for covering the copper surfaces is to nickel them. However, this process is even less economical than painting the free copper surfaces.

Eine andere Methode zur Verhinderung der Oxidierung und Lösung von Kupfer durch das Transformatoröl besteht darin, dem Transformatoröl stabilisierende Additive zuzufügen. Zu diesem Zweck eignet sich beispielsweise 2,6-Di- tert.butyl-p-kresol, das im Öl gelöst als Oxidationsinhibitor wirkt. Nachteilig bei dieser Lösung ist jedoch, dass derartige Oxidationsinhibitoren zu ihrer Wirksamkeit in verhältnismässig grossen Mengen vollständig im Transformatoröl gelöst sein müssen.Another method of preventing the oxidation and dissolution of copper by the transformer oil is to add stabilizing additives to the transformer oil. For this purpose, for example, 2,6-di-tert-butyl-p-cresol is suitable, which acts as an oxidation inhibitor when dissolved in the oil. A disadvantage of this solution, however, is that, in order to be effective, such oxidation inhibitors must be completely dissolved in the transformer oil in relatively large amounts.

Aus der JP-A 75105559 ist die Verwendung von Oxalsäurehydraziden zum Schutz von Kohlenwasserstoffölen gegen metallinduzierten Abbau bekannt. Ähnliche Hydrazide werden gemäss der DE-A 2403064 auch als Inhibitoren gegen den kupferinduzierten Abbau von Polyolefinen beschrieben. Diese bekannten Anwendungen beschränken den Einsatz von Hydraziden jedoch auf jeweils eine bestimmte Art eines Isolierwerkstoffes und lassen keine Rückschlüsse auf das Verhalten gegenüber einer Kombination verschiedener Arten von Isolierwerkstoffen zu.JP-A 75105559 discloses the use of oxalic acid hydrazides for protecting hydrocarbon oils against metal-induced degradation. Similar hydrazides are also described according to DE-A 2403064 as inhibitors against the copper-induced degradation of polyolefins. However, these known applications limit the use of hydrazides to a particular type of insulation material and do not allow any conclusions to be drawn about the behavior with respect to a combination of different types of insulation material.

Die Lösung und Aufnahme von Kupfer durch Transformatoröl lässt sich im Prinzip auch dadurch verhindern, dass anstelle von Kupfer katalytisch weniger aktives Aluminium als Wickelleiterwerkstoff eingesetzt wird. Die Verwendung von Aluminium als Alternative zum Kupfer in Wicklungen von Grosstransformatoren hat sich jedoch bisher nicht durchgesetzt, da das Aluminium wegen seiner geringeren elektrischen Leitfähigkeit, seiner ungünstigeren mechanischen Eigenschaften und seiner schlechteren Verarbeitbarkeit bei der bestehenden Preisrelation zum Kupfer keine ausreichenden Vorteile bietet.In principle, the dissolution and absorption of copper by transformer oil can also be prevented by using catalytically less active aluminum as the winding conductor material instead of copper. However, the use of aluminum as an alternative to copper in the windings of large transformers has so far not been successful, since aluminum does not offer sufficient advantages due to its lower electrical conductivity, its less favorable mechanical properties and its poorer processability in the existing price relation to copper.

Der Erfindung liegt daher die Aufgabe zugrunde, für Transformatoren eine Methode zu schaffen, durch die auf wirtschaftliche Art und Weise die Lösung und Aufnahme von Kupfer durch das Transformatoröl zuverlässig verhindert ist, so dass auch bei unmittelbarer gegenseitiger Berührung von Kupferleitern und Transformatoröl keine hierdurch oxidative Alterung verursacht ist, wobei gleichzeitig eine Ablagerung von Kupfer auf dem festen Isolierwerkstoff vermieden werden soll.The invention is therefore based on the object of providing a method for transformers by which the dissolution and absorption of copper by the transformer oil is reliably prevented in an economical manner, so that even if there is direct contact between the copper conductors and the transformer oil there is no oxidative aging as a result is caused, at the same time a deposition of copper on the solid insulating material should be avoided.

Diese Aufgabe ist bei flüssigkeitsgekühlten Transformatoren mit Kupferwicklungen erfindungsgemäss durch die im kennzeichnenden Teil des Anspruches 1 genannten Merkmale gelöst.This object is achieved in liquid-cooled transformers with copper windings according to the invention by the features mentioned in the characterizing part of claim 1.

Nach zweckmässigen Weiterbildungen der Erfindung besteht die Depotfüllung aus kristallinem Kupfer-Desaktivator und ist ein die Wicklungen und die Isolierwerkstoffe enthaltender Transformatorkessel hermetisch von der Aussenluft abgeschlossen.According to expedient developments of the invention, the depot filling consists of crystalline copper deactivator and a transformer tank containing the windings and the insulating materials is hermetically sealed from the outside air.

Nach anderen zweckmässigen Weiterbildungen der Erfindung sind zusätzlich zu dem Kupfer-Desaktivator ein oder mehrere Oxidationsinhibitoren, beispielsweise 2,6-Di-tert.butyl-p-kresol, in den flüssigen Isolierwerkstoff und/oder in das Depot eingebracht, und ist das Depot durch einen Beutel aus engmaschigem, öl- und wärmestabilem, alterungsbeständigem Werkstoff, wie Glas oder Edelstahl, zusammengehalten. Zweckmässigerweise ist der Beutel über den Wicklungen, am Deckel des Transformatorkessels, im Kühlmittelkreislauf angeordnet und ist sein Inhalt während der gesamten Betriebsdauer des Transformators kontrollierbar.According to other expedient developments of the invention, in addition to the copper deactivator, one or more oxidation inhibitors, for example 2,6-di-tert.butyl-p-cresol, have been introduced into the liquid insulating material and / or into the depot, and the depot is complete holding a bag made of a fine-meshed, oil and heat stable, aging-resistant material, such as glass or stainless steel. The bag is expediently arranged in the coolant circuit above the windings, on the cover of the transformer tank, and its contents can be checked during the entire operating time of the transformer.

Der erfindungsgemässe Einsatz von Kupfer-Desaktivatoren ist sehr vorteilhaft, da diese schon in kleinen Mengen wirken und, obwohl sie bisher im Transformatoröl nicht nachweisbar sind, überraschenderweise trotzdem im Kontakt mit dem Transformatoröl die Alterung des Isoliermittelsystems aus Transformatoröl und Zellulose stark verzögern. Dabei bringt der Einsatz dieser Kupfer-Desaktivatoren in Kombination mit einem oder mehreren Oxidationsinhibitoren eine weitere vorteilhafte Verzögerung der Alterung des Isoliermittelsystems.The use of copper deactivators according to the invention is very advantageous, since they already work in small quantities and, although they have not been detectable in transformer oil so far, surprisingly retard the aging of the insulating agent system consisting of transformer oil and cellulose in contact with the transformer oil. The use of these copper deactivators in combination with one or more oxidation inhibitors brings a further advantageous delay in the aging of the insulation system.

Zwei Ausführungsbeispiele der Erfindung sind anhand einer Zeichnung in den Figuren 1 und 2 näher erläutert.Two embodiments of the invention are explained in more detail with reference to a drawing in Figures 1 and 2.

In einem mit Öl gefüllten Kessel 9 für einen Transformator ist ein Kern 12 aufgestellt. Der Kernschenkel 12 ist von einer innen liegenden Unterspannungswicklung 7 und einer radial weiter aussen liegenden Oberspannungswicklung 5 umgeben. Die Unterspannungswicklung 7 ist von Abschirmbarrieren 6 und die Oberspannungswicklung 5 durch Abschirmbarrieren 4 aus festem Werkstoff auf Zellulosebasis elektrisch isoliert.A core 12 is installed in an oil-filled boiler 9 for a transformer. The core leg 12 is of an internal undervoltage winding 7 and a radial white the outer high-voltage winding 5 surrounded. The undervoltage winding 7 is electrically insulated from shielding barriers 6 and the high-voltage winding 5 by shielding barriers 4 made of a solid cellulosic material.

Sowohl die Unterspannungswicklung 7 als auch die Oberspannungswicklung 5 stützen sich auf einem Wicklungsauflagetisch 3 ab, der seinerseits über Stützen 2 von einem Pressrahmen 1 getragen ist. Die Anordnung aus dem Pressrahmen 1, der Stützen 2 und dem Wicklungstisch 3 dient in Verbindung mit nicht dargestellten entsprechenden Bauteilen auf der Oberseite der Wicklungen 5 und 7 zur Pressung derselben in axialer Richtung sowie zu deren Fixierung gegenüber dem Kern 12.Both the low-voltage winding 7 and the high-voltage winding 5 are supported on a winding support table 3, which in turn is supported by a press frame 1 via supports 2. The arrangement of the press frame 1, the supports 2 and the winding table 3 is used in conjunction with corresponding components (not shown) on the top of the windings 5 and 7 for pressing the same in the axial direction and for fixing them to the core 12.

Der Pressrahmen 1 ist hohl ausgeführt und dient gleichzeitig durch seinen Anschluss an eine von einem Kühler 10 kommende Rohrleitung 15 als Kühlmittelzuleitungsrohr. Kanäle 13 und 14 in den Stützen 2 dienen zur Führung der Kühlflüssigkeit in Richtung der Pfeile 8. Dabei ist die Strömungsgeschwindigkeit des Kühlmittels in Richtung der Pfeile 8 durch eine Pumpe 11 eingestellt.The press frame 1 is hollow and at the same time serves as a coolant supply pipe due to its connection to a pipe 15 coming from a cooler 10. Channels 13 and 14 in the supports 2 serve to guide the coolant in the direction of the arrows 8. The flow rate of the coolant in the direction of the arrows 8 is set by a pump 11.

Nach seinem Austritt aus den oberen Wicklungsenden passiert das Kühlmittel auf seinem Weg in Richtung der Pfeile 8 ein Depot 16, bevor es in die Rohrleitung 15 zur Pumpe 11 hin eintritt. Das Depot 16 ist in den oberen Teil einer Seitenwand des Kessels 9 fest eingebaut und sowohl zum Innenraum des Kessels 9 hin als auch in Richtung auf die Rohrleitung 15 durch Siebe 17 abgegrenzt. Die Siebe 17 halten in der Strömung des Kühlmittels einen Vorrat von einem Kupfer-Desaktivator, beispielsweise N,N' -Bis-salicyloylhydrazin. Gegebenenfalls ist dem Kupfer-Desaktivator noch ein Oxidationsinhibitor beigemischt, beispielsweise 2,6-Di-tert.butyl-p-kresol. Der Vorrat und das Aussehen des Kupfer-Desaktivators und des Oxidationsinhibitors ist im Betriebszustand von aussen durch ein Fenster 18 kontrollierbar.After its exit from the upper ends of the winding, the coolant passes a depot 16 on its way in the direction of the arrows 8 before it enters the pipeline 15 to the pump 11. The depot 16 is permanently installed in the upper part of a side wall of the boiler 9 and is delimited by sieves 17 both towards the interior of the boiler 9 and in the direction of the pipeline 15. The screens 17 keep a supply of a copper deactivator, for example N, N '-bis-salicyloyl hydrazine, in the flow of the coolant. If appropriate, an oxidation inhibitor is also added to the copper deactivator, for example 2,6-di-tert-butyl-p-cresol. The supply and the appearance of the copper deactivator and the oxidation inhibitor can be checked from outside through a window 18 in the operating state.

Figur 2 zeigt einen Transformator mit einem etwas entfernter von seinem Kessel 9 aufgestellten Kühler 10. Wiederum sind der Kessel 9 und der Kühler 10 durch Rohrleitungen 15 miteinander verbunden und wird der Kühlmittelstrom durch eine am Einlauf in den Kühler 10 angeordnete Pumpe 11 in Richtung der Pfeile 8 angetrieben.FIG. 2 shows a transformer with a cooler 10 set up a little further away from its boiler 9. Again, the boiler 9 and the cooler 10 are connected to one another by pipes 15 and the coolant flow is regulated in the direction of the arrows by a pump 11 arranged at the inlet into the cooler 10 8 driven.

Für einen Teil der Strecke zwischen dem Kessel 9 und der Pumpe 11 ist bei diesem Ausführungsbeispiel die Rohrleitung 15 in zwei parallele Zweige aufgeteilt, von denen jeder auch für sich allein den gesamten Kühlmittelstrom führen kann. In einem dieser Zweige ist zwischen zwei Schiebern 19 das Depot 16 und in dem anderen Zweig ist lediglich ein Schieber 19 angeordnet.For part of the distance between the boiler 9 and the pump 11, the pipeline 15 is divided into two parallel branches in this exemplary embodiment, each of which can carry the entire coolant flow on its own. In one of these branches, the depot 16 is located between two slides 19 and in the other branch only one slider 19 is arranged.

Im Normalbetrieb führt der das Depot 16 enthaltende Zweig den gesamten Kühlmittelstrom. Vor Kontroll- und/oder Wartungsarbeiten an dem Depot 16 wird zunächst der Schieber 19 in dem an dem Depot vorbeiführenden Zweig geöffnet, bevor die Schieber am Ein- und Auslauf des Depots 16 geschlossen werden. Danach ist ein Öffnen oder eine Demontage des Depots 16 ohne Betriebsunterbrechung für den Transformator möglich. Vor Wiederinbetriebnahme des Depots 16 wird dieses evakuiert und das dabei entstandene Vakuum mit Transformatoröl gefüllt.In normal operation, the branch containing the depot 16 guides the entire coolant flow. Before inspection and / or maintenance work on the depot 16, the slide 19 in the branch that leads past the depot is first opened before the slide at the inlet and outlet of the depot 16 is closed. Thereafter, the depot 16 can be opened or dismantled without interrupting the operation of the transformer. Before the depot 16 is put back into operation, it is evacuated and the resulting vacuum is filled with transformer oil.

Bei in der Zeichnung nicht dargestellten Transformatoren ohne besondere Kühler 10, beispielsweise Transformatoren mit einem Wellwandkessel, ist das Depot 16 zweckmässig in einer unter dem Kesseldeckel hängenden Kammer untergebracht. Diese Kammer ist im Betriebszustand zum Kesselinnenraum hin geöffnet, so dass Transformatoröl durch das Depot strömt. Zu Kontroll- und Wartungsarbeiten an dem Depot ist die Kammer gegenüber dem Kesselinnenraum verschliessbar.In the case of transformers (not shown in the drawing) without a special cooler 10, for example transformers with a corrugated wall boiler, the depot 16 is expediently accommodated in a chamber hanging under the boiler cover. In operation, this chamber is open to the interior of the boiler, so that transformer oil flows through the depot. The chamber opposite the boiler interior can be locked for inspection and maintenance work on the depot.

Claims (7)

1. Transformer having an electrical insulation of its windings, which are made from copper profiles, consisting of solid and liquid insulating materials which are active as electrically connected in series and of which the liquid insulating material is represented by a transformer oil which simultaneously serves as a cooling liquid, and where a copper deactivator is included in the liquid insulating material, characterised in
- that N.N'-Bis-salicyloylhydrazine and/or N.N'-Dipelargonylterephtalic acid-dihydrazide are provided as copper deactivator; and
- that a store (16) of solid copper deactivator is arranged in the flow (8) of the liquid insulating material.
2. A transformer as claimed in Claim 1, characterised in that the store filling consists of a crystalline copper deactivator.
3. A transformer as claimed in Claim 1 and 2, characterised in that a transformer tank (9) which contains the windings (5, 7) and the insulating materials (4, 6, 8), is hermetically sealed from the outer air.
4. A transformer as claimed in Claim 1 to 3, characterised in that, in addition to the copper deactivator, one or more oxidation inhibitors, for example, 2.6-Di-tert.butyl-p-cresol, are introduced into the liquid insulating material and/or into the store (16).
5. A transformer as claimed in Claim 1 to 4, characterised in that the store (16) is accommodated in a bag consisting of a close-mesh material which is stable to oil and heat and resistant to ageing, such as glass or high-grade steel.
6. A transformer as claimed in Claim 1 to 5, characterised in that the bag is arranged above the windings on the cover of the transformer tank (9) in the coolant circuit (8); and that its contents are controllable during the total duration of operation of the transformer.
7. A transformer as claimed in Claim 1 to 4, characterised in that the store (16) is arranged between two slide valves (19) in one of two parallel branches of a pipeline (15) between the tank (9) and a cooler (10); and that each of the two parallel branches of the pipeline (15) can be closed off by slide valves (19).
EP82111268A 1981-12-18 1982-12-06 Transformer with copper coils Expired EP0083736B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82111268T ATE22364T1 (en) 1981-12-18 1982-12-06 TRANSFORMER WITH COPPER WINDINGS.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3150361 1981-12-18
DE3150361 1981-12-18
DE19823201298 DE3201298A1 (en) 1981-12-18 1982-01-18 TRANSFORMER WITH COPPER WINDINGS
DE3201298 1982-01-18

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EP0083736A1 EP0083736A1 (en) 1983-07-20
EP0083736B1 true EP0083736B1 (en) 1986-09-17

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EP82111268A Expired EP0083736B1 (en) 1981-12-18 1982-12-06 Transformer with copper coils

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US (1) US4472700A (en)
EP (1) EP0083736B1 (en)
BR (1) BR8207360A (en)
DE (2) DE3201298A1 (en)

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US3798286A (en) * 1972-05-18 1974-03-19 Hercules Inc Stabilized polyolefins useful as wire insulation in petroleum-jelly filled cables
JPS5271619A (en) * 1975-12-12 1977-06-15 Toshiba Corp Oil-filled electric machines
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Also Published As

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DE3201298A1 (en) 1983-06-30
EP0083736A1 (en) 1983-07-20
BR8207360A (en) 1983-10-18
DE3273384D1 (en) 1986-10-23
US4472700A (en) 1984-09-18

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