EP0037796B1 - Current transformer having fluid insulant - Google Patents

Current transformer having fluid insulant Download PDF

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Publication number
EP0037796B1
EP0037796B1 EP81730027A EP81730027A EP0037796B1 EP 0037796 B1 EP0037796 B1 EP 0037796B1 EP 81730027 A EP81730027 A EP 81730027A EP 81730027 A EP81730027 A EP 81730027A EP 0037796 B1 EP0037796 B1 EP 0037796B1
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EP
European Patent Office
Prior art keywords
support plate
current transformer
box
insulator
plate
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.)
Expired
Application number
EP81730027A
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German (de)
French (fr)
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EP0037796A1 (en
Inventor
Rudolf Bahr
Peter Stenzel
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 AG
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Siemens AG
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Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to AT81730027T priority Critical patent/ATE6448T1/en
Publication of EP0037796A1 publication Critical patent/EP0037796A1/en
Application granted granted Critical
Publication of EP0037796B1 publication Critical patent/EP0037796B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • 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
    • 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
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling

Definitions

  • the invention relates to a gas or liquid-insulated current transformer for high voltage with a head housing attached above an insulator, which is penetrated by a primary conductor and in which at least one iron core with an applied secondary winding is accommodated in a protective cover, the protective cover being carried by a metal tube , which runs in the insulator and is fastened to an upper support plate of a foot housing located below the insulator, the current transformer is supported on the outer edge of the support plate and a box with bushings hangs on the support plate below.
  • the gas or liquid-filled space is limited by the insulator, the head housing, a metal shield and the annular area of the support plate between the metal shield and the insulator.
  • the insulator is gas-tightly connected to the head housing and the support plate;
  • the metal shield contains a gap, in the area of which the metal shield is sealed off from the outside.
  • the connection point between the metal shield and the support plate is thus also made gastight or liquid-tight.
  • a box below the support plate only serves to stabilize the mechanical connection of the metal pipe to the support plate.
  • the annular area of the support plate between the insulator and the metal shield is stressed both by the weight of the current transformer and by the pressure of the insulating medium.
  • the upper support plate of the foot housing not only fulfills a carrying function for the insulator and the protective cover with the iron cores, but also forms a pressure wall of the gas-filled interior of the current transformer.
  • the support plate is therefore subjected to a relatively high mechanical load and must therefore be made of a relatively solid, high-quality material.
  • the invention has for its object to propose a gas or liquid insulated current transformer in which the support plate of the foot housing is relatively little stressed.
  • the box is attached in a gastight or liquid-tight manner to the support plate provided with feet and is sealed at the bottom with a bushing plate carrying the bushings, and the interior of the box is closed Through holes in the support plate connected to the interior of the insulator and the head housing.
  • the support plate is therefore deliberately not sealed off from the part of the foot housing below it, so that the same pressure prevails above and below the support plate; the support plate of the current transformer according to the invention therefore only carries out a carrying function for the insulator and the protective cover with the iron cores and is not stressed by the pressure of the insulating gas or the insulating liquid.
  • the interior of the current transformer according to the invention is sealed from the outside in the area of the foot housing by the box which hangs on the bottom of the support plate and is therefore not used for the carrying function in the current transformer according to the invention.
  • the feet of the current transformer are held on the outer edge of the support plate.
  • the box is therefore only claimed by the pressure inside the current transformer according to the invention and must therefore only be dimensioned with a view to this pressure. This leads to a relatively low use of high-quality material.
  • the design of the current transformer according to the invention makes it possible to advantageously arrange a filter in the form of a ring in the space of the box above the feed-through plate.
  • the filter is a filter used in gas-insulated high-voltage switchgear and is used to bind moisture.
  • the arrangement of the filter within the box facilitates its replacement, if necessary, because the filter is only accessible from the feed-through plate after loosening.
  • the through holes in the support plate allow the insulating gas to circulate through convection and therefore enable the filter to perform its function satisfactorily.
  • the filter advantageously lies in an annular space which is formed on the one hand by the support plate and on the other hand by an annular part welded to the box; the feed-through plate is fastened to the ring part with the interposition of a sealing ring.
  • the structural design of the current transformer according to the invention with respect to the foot housing advantageously leads to the fact that the lead-through plate for leading electrical lines out of the interior of the current transformer is only exposed to the pressure of the insulating gas or the insulating liquid; The feed-through plate is not exposed to additional loads from carrying functions.
  • the contact pins are provided with connecting wires before the casting, so that after the casting no mechanical forces have to be exerted on the contact pins. Such forces, which otherwise arise when the connecting wires are clamped, could cause the feed-through plate to leak in the area of the contact pins.
  • the current transformer 1 shown has an insulator 2 to which a head housing 4 is fastened via a flange connection 3.
  • the head housing 4, which is made of metal, is penetrated by a conductor 5, which forms the primary winding of the current transformer 1.
  • a protective cover 6 is arranged within the head housing 4, in which iron cores 7 and 8 with secondary windings 9 and 10 are accommodated; the protective cover 6 thus represents a conventional core shell and is also made of metal.
  • the protective cover 6 is mechanically connected to a metal tube 12 of a plastic film leadthrough 13 via a connecting member 11.
  • the metal tube 12 passes through the insulator 2 and carries a fastening flange 14 at its lower end in FIG. 1. With this fastening flange 14, the metal tube 12 stands on an upper support plate 15 of a foot housing 16.
  • the metal tube 12 is fixed to the support plate by screws 17 15 braced.
  • the support plate 15 like the flange 3 of the head housing 4, is tightly connected to the insulator 2.
  • the support plate 15 has on its outer edge 18 feet 19 which are arranged, for example, offset at an angle of 90 °. The current transformer according to the invention is thus held over the feet 19 and the support plate 15.
  • a gas-tight or liquid-tight box 20 which is welded to the support plate 15, for example.
  • a ring part 21 made of metal is welded, which carries a sealing ring 22.
  • a filter 24, which binds the moisture in a known manner when the current transformer is filled with gas, is accommodated above the ring part 21 in an annular space 23 formed by this ring part 21 and the support plate 15.
  • a bushing plate 25 is screwed onto the ring part 21 from below, as a result of which the space above the sealing plate 25 is sealed off from the free atmosphere.
  • the box 20 actually hangs on the support plate 15, that is to say does not reach as far down as the feet 19. Therefore, the box 20 is only exposed to the pressure of the insulating gas or the insulating liquid in its space 27 and can therefore relate to it be dimensioned according to its wall. The box 20 therefore does not have any supporting functions, so that it can be relatively thin in relation to its wall.
  • the feed-through plate 25 has four diversions 38 in the exemplary embodiment shown. 2 and 3 show that each rejection takes place via a contact pin 30, at the two ends 31 and 32 of which connecting wires 33 and 34 are clamped in the usual manner.
  • the feed-through plate 25 is designed as a cast plastic plate and is produced in such a way that the contact pins 30 are provided with the connecting wires 33 and 34 before the contact pins 30 are embedded. After the encapsulation, the embedded contact pins 30 thus have the connecting wires 33 and 34 and therefore do not have to be clamped subsequently. This has the great advantage that the contact pins are not mechanically stressed, so that leaks in the area of the contact pins are avoided.
  • circumferential grooves 35 and 36 are provided on both sides of the feed-through plate 25.
  • the connecting wires 33 and 34 are then connected at contact points 37 both to the secondary connecting lines 38 of the secondary windings 9 and 10 and also to connecting lines 39 to secondary terminals (not shown in the figure) in a secondary terminal box 40; this connection takes place at points 41.

Abstract

1. A gas- or liquid-insulated current transformer for high voltage comprising a head housing (4) which is arranged above an insulator (2) and through which passes a primary conductor (5) and in which, in a protective sleeve (6), there is arranged at least one iron core (7, 8) provided with a secondary winding (9, 10), wherein the protective sleeve is supported by a metal tube (12) which is arranged in the insulator (2) and is fixed to an upper support plate (15) of a base housing (18) located beneath the insulator, wherein the current transformer is braced at the outer edge of the support plate, and wherein a box (20) provided with ducts is suspended from the lower part of the support plate, characterised in that the box (20) is fixed in gas- and liquid-tight manner, to the support plate (15), which is provided with feet (19), and at the bottom, is tightly sealed by lead-through plate (25) which carries the ducts ; and that the interior (27) of the box (20) is connected to the interior of the insulator (2) and of the head housing by way of through-openings (26) in the support plate (15).

Description

Die Erfindung bezieht sich auf einen gas- oder flüssigkeitsisolierten Stromwandler für Hochspannung mit einem oberhalb eines Isolators angebrachten Kopfgehäuse, das von einem Primärleiter durchsetzt ist und in dem in einer Schutzhülle mindestens ein Eisenkern mit aufgebrachter Sekundärwicklung untergebracht ist, wobei die Schutzhülle von einem Metallrohr getragen ist, das in dem Isolator verläuft und an einer oberen Stützplatte eines unterhalb des Isolators liegenden Fußgehäuses befestigt ist, am äußeren Rand der Stützplatte eine Abstützung des Stromwandlers erfolgt und unten an der Stützplatte ein Kasten mit Durchführungen hängt.The invention relates to a gas or liquid-insulated current transformer for high voltage with a head housing attached above an insulator, which is penetrated by a primary conductor and in which at least one iron core with an applied secondary winding is accommodated in a protective cover, the protective cover being carried by a metal tube , which runs in the insulator and is fastened to an upper support plate of a foot housing located below the insulator, the current transformer is supported on the outer edge of the support plate and a box with bushings hangs on the support plate below.

Bei einem bekannten Stromwandler dieser Art (GB-PS 651 506) wird der gas- oder flüssigkeitsgefüllte Raum durch den Isolator, das Kopfgehäuse, eine Metallabschirmung und den ringförmigen Bereich der Stützplatte zwischen der Metallabschirmung und dem Isolator begrenzt. Der Isolator ist gasdicht mit dem Kopfgehäuse und der Stützplatte verbunden ; die Metallabschirmung enthält zur Vermeidung einer Kurzschlußwindung einen Spalt, in dessen Bereich die Metallabschirmung nach außen hin abgedichtet ist. Die Verbindungsstelle zwischen der Metallabschirmung und der Stützplatte ist somit ebenfalls gas- oder flüssigkeitsdicht ausgeführt. Ein Kasten unterhalb der Stützplatte dient nur zur Stabilisierung der mechanischen Verbindung des Metallrohres mit der Stützplatte. Der ringförmige Bereich der Stützplatte zwischen dem Isolator und der Metallabschirmung wird sowohl durch die Gewichtskraft des Stromwandlers als auch durch den Druck des Isoliermediums belastet.In a known current transformer of this type (GB-PS 651 506) the gas or liquid-filled space is limited by the insulator, the head housing, a metal shield and the annular area of the support plate between the metal shield and the insulator. The insulator is gas-tightly connected to the head housing and the support plate; To avoid a short-circuit turn, the metal shield contains a gap, in the area of which the metal shield is sealed off from the outside. The connection point between the metal shield and the support plate is thus also made gastight or liquid-tight. A box below the support plate only serves to stabilize the mechanical connection of the metal pipe to the support plate. The annular area of the support plate between the insulator and the metal shield is stressed both by the weight of the current transformer and by the pressure of the insulating medium.

Bei einem weiteren bekannten Stromwandler (DE-AS1488299) erfüllt die obere Stützplatte des Fußgehäuses nicht nur eine Tragefunktion für den Isolator und die Schutzhülle mit den Eisenkernen, sondern bildet auch eine Druckwand des gasgefüllten Innenraumes des Stromwandlers. Die Stützplatte wird bei dem bekannten Stromwandler daher mechanisch relativ stark beansprucht und muß daher aus einem hochwertigen Werkstoff verhältnismäßig massiv ausgeführt sein.In another known current transformer (DE-AS1488299) the upper support plate of the foot housing not only fulfills a carrying function for the insulator and the protective cover with the iron cores, but also forms a pressure wall of the gas-filled interior of the current transformer. In the known current transformer, the support plate is therefore subjected to a relatively high mechanical load and must therefore be made of a relatively solid, high-quality material.

Der Erfindung liegt die Aufgabe zugrunde, einen gas- oder flüssigkeitsisolierten Stromwandler vorzuschlagen, bei dem die Stützplatte des Fußgehäuses verhältnismäßig wenig beansprucht ist.The invention has for its object to propose a gas or liquid insulated current transformer in which the support plate of the foot housing is relatively little stressed.

Zur Lösung dieser Aufgabe ist bei einem gas-oder flüssigkeitsisolierten Stromwandler der eingangs angegebenen Art erfindungsgemäß der Kasten gas- oder flüssigkeitsdicht an der mit Füßen versehenen Stützplatte befestigt und nach unten hin mit einer die Durchführungen tragenden Durchführungsplatte dicht verschlossen, und der Innenraum des Kastens ist über Durchgangslöcher in der Stützplatte mit dem Innenraum des Isolators und des Kopfgehäuses verbunden.To achieve this object, in a gas or liquid-insulated current transformer of the type specified at the outset, the box is attached in a gastight or liquid-tight manner to the support plate provided with feet and is sealed at the bottom with a bushing plate carrying the bushings, and the interior of the box is closed Through holes in the support plate connected to the interior of the insulator and the head housing.

Bei dem erfindungsgemäßen Stromwandler ist also die Stützplatte zu dem unter ihr befindlichen Teil des Fußgehäuses bewußt nicht abgedichtet, so daß oberhalb und unterhalb der Stützplatte derselbe Druck herrscht ; die Stützplatte des erfindungsgemäßen Stromwandlers übt daher nur eine Tragefunktion für den Isolator und die Schutzhülle mit den Eisenkernen aus und wird nicht durch den Druck des Isoliergases oder der Isolierflüssigkeit beansprucht. Dies hat den Vorteil, daß die Stützplatte nicht nur verhältnismäßig dünn ausgeführt werden kann, sondern auch aus einem relativ billigen Werkstoff bestehen kann. Die Abdichtung des Innenraumes des erfindungsgemäßen Stromwandlers nach außen hin erfolgt im Bereich des Fußgehäuses durch den Kasten, der unten an der Stützplatte hängt und somit zur Tragefunktion bei dem erfindungsgemäßen Stromwandler nicht mitherangezogen wird. Die Füße des Stromwandlers sind nämlich am äußeren Rand der Stützplatte gehalten. Der Kasten ist daher nur durch den Druck im Innern des erfindungsgemäßen Stromwandlers beansprucht und muß daher nur im Hinblick auf diesen Druck bemessen sein. Dies führt zu einem verhältnismäßig geringen Einsatz hochwertigen Werkstoffes.In the current transformer according to the invention, the support plate is therefore deliberately not sealed off from the part of the foot housing below it, so that the same pressure prevails above and below the support plate; the support plate of the current transformer according to the invention therefore only carries out a carrying function for the insulator and the protective cover with the iron cores and is not stressed by the pressure of the insulating gas or the insulating liquid. This has the advantage that the support plate can not only be made relatively thin, but can also consist of a relatively cheap material. The interior of the current transformer according to the invention is sealed from the outside in the area of the foot housing by the box which hangs on the bottom of the support plate and is therefore not used for the carrying function in the current transformer according to the invention. The feet of the current transformer are held on the outer edge of the support plate. The box is therefore only claimed by the pressure inside the current transformer according to the invention and must therefore only be dimensioned with a view to this pressure. This leads to a relatively low use of high-quality material.

Die Ausbildung des erfindungsgemäßen Stromwandlers ermöglicht es, in vorteilhafter Weise in dem Raum des Kastens oberhalb der Durchführungsplatte ein Filter ringförmig anzuordnen. Bei dem Filter handelt es sich um ein in gasisolierten Hochspannungsschaltanlagen übliches Filter, mit dem Feuchtigkeit gebunden wird. Die Anordnung des Filters innerhalb des Kastens erleichtert seinen gegebenenfalls erforderlichen Austausch, weil das Filter nach Lösen nur der Durchführungsplatte zugänglich ist. Die Durchgangslöcher in der Stützplatte erlauben einen Umlauf des Isoliergases durch Konvektion und ermöglichen daher dem Filter, seine Funktion zufriedenstellend auszuüben.The design of the current transformer according to the invention makes it possible to advantageously arrange a filter in the form of a ring in the space of the box above the feed-through plate. The filter is a filter used in gas-insulated high-voltage switchgear and is used to bind moisture. The arrangement of the filter within the box facilitates its replacement, if necessary, because the filter is only accessible from the feed-through plate after loosening. The through holes in the support plate allow the insulating gas to circulate through convection and therefore enable the filter to perform its function satisfactorily.

Bei dem erfindungsgemäßen Stromwandler liegt das Filter vorteilhafterweise in einem Ringraum, der einerseits von der Stützplatte und andererseits von einem an den Kasten angeschweißten Ringteil gebildet ist; an dem Ringteil ist unter Zwischenlage eines Dichtungsringes die Durchführungsplatte befestigt. Dieses Ausgestaltung ermöglicht eine einfache Montage des erfindungsgemäßen Stromwandiers.In the current transformer according to the invention, the filter advantageously lies in an annular space which is formed on the one hand by the support plate and on the other hand by an annular part welded to the box; the feed-through plate is fastened to the ring part with the interposition of a sealing ring. This configuration enables the current transformer according to the invention to be easily installed.

Es hat sich ferner als vorteilhaft erwiesen, wenn an dem Kasten ein Klemmenkasten zur Aufnahme der Sekundärklemmen befestigt ist.It has also proven to be advantageous if a terminal box for receiving the secondary terminals is attached to the box.

Die konstruktive Ausgestaltung des erfindungsgemäßen Stromwandlers hinsichtlich des Fußgehäuses führt in vorteilhafter Weise dazu, daß die Durchführungsplatte zum Hinausführen elektrischer Leitungen aus dem Innenraum des Stromwandlers nur dem Druck des Isoliergases oder der Isolierflüssigkeit ausgesetzt ist ; zusätzlichen Belastungen durch Tragfunktionen ist die Durchführungsplatte nicht ausgesetzt. Dies ermöglicht es in vorteilhafter Weise, die Durchführungsplatte als Kunststoff-Gußplatte auszuführen, in die vor dem Vergießen mit Anschlußdrähten versehene Kontaktstifte eingebettet sind. Die Kontaktstifte sind vor dem Vergießen mit Anschlußdrähten versehen, damit nach dem Vergießen keine mechanischen Kräfte mehr auf die Kontaktstifte ausgeübt werden müssen. Durch derartige Kräfte, die ansonsten beim Festklemmen der Anschlußdrähte entstehen, könnte die Durchführungsplatte im Bereich der Kontaktstifte undicht werden.The structural design of the current transformer according to the invention with respect to the foot housing advantageously leads to the fact that the lead-through plate for leading electrical lines out of the interior of the current transformer is only exposed to the pressure of the insulating gas or the insulating liquid; The feed-through plate is not exposed to additional loads from carrying functions. This he it is possible in an advantageous manner to design the feed-through plate as a cast plastic plate, in which contact pins provided with connecting wires are embedded before the casting. The contact pins are provided with connecting wires before the casting, so that after the casting no mechanical forces have to be exerted on the contact pins. Such forces, which otherwise arise when the connecting wires are clamped, could cause the feed-through plate to leak in the area of the contact pins.

Zur Erläuterung der Erfindung ist in

  • Figur 1 ein Schnitt durch ein Ausführungsbeispiel des erfindungsgemäßen Stromwandlers, in
  • Figur 2 eine Seitenansicht auf eine Ausführungsform einer Durchführungsplatte und in
  • Figur 3 ein Schnitt durch diese Durchführungsplatte dargestellt.
To explain the invention is in
  • 1 shows a section through an embodiment of the current transformer according to the invention, in
  • Figure 2 is a side view of an embodiment of a feed-through plate and in
  • Figure 3 shows a section through this feedthrough plate.

Der dargestellte Stromwandler 1 weist einen Isolator 2 auf, an dem über eine Flanschverbindung 3 ein Kopfgehäuse 4 befestigt ist. Das Kopfgehäuse 4, das aus Metall besteht, ist von einem Leiter 5 durchsetzt, der die Primärwicklung des Stromwandlers 1 bildet.The current transformer 1 shown has an insulator 2 to which a head housing 4 is fastened via a flange connection 3. The head housing 4, which is made of metal, is penetrated by a conductor 5, which forms the primary winding of the current transformer 1.

Innerhalb des Kopfgehäuses 4 ist eine Schutzhülle 6 angeordnet, in der Eisenkerne 7 und 8 mit Sekundärwicklungen 9 und 10 untergebracht sind ; die Schutzhülle 6 stellt also eine übliche Kernschale dar und ist ebenfalls aus Metall hergestellt.A protective cover 6 is arranged within the head housing 4, in which iron cores 7 and 8 with secondary windings 9 and 10 are accommodated; the protective cover 6 thus represents a conventional core shell and is also made of metal.

Über ein Verbindungsglied 11 ist die Schutzhülle 6 mechanisch mit einem Metallrohr 12 einer Kunststoffolien-Durchführung 13 verbunden. Das Metallrohr 12 durchsetzt den Isolator 2 und trägt an seinem in der Fig. 1 unteren Ende einen Befestigungsflansch 14. Mit diesem Befestigungsflansch 14 steht das Metallrohr 12 auf einer oberen Stützplatte 15 eines Fußgehäuses 16. Durch Schrauben 17 ist das Metallrohr 12 fest mit der Stützplatte 15 verspannt. Die Stützplatte 15 ist übrigens ebenso wie der Flansch 3 des Kopfgehäuses 4 dicht mit dem Isolator 2 verbunden. Die Stützplatte 15 weist an ihrem äußeren Rand 18 Füße 19 auf, die beispielsweise im Winkel von jeweils 90° versetzt angeordnet sind. Über die Füße 19 und die Stützplatte 15 ist somit der erfindungsgemäße Stromwandler gehalten.The protective cover 6 is mechanically connected to a metal tube 12 of a plastic film leadthrough 13 via a connecting member 11. The metal tube 12 passes through the insulator 2 and carries a fastening flange 14 at its lower end in FIG. 1. With this fastening flange 14, the metal tube 12 stands on an upper support plate 15 of a foot housing 16. The metal tube 12 is fixed to the support plate by screws 17 15 braced. Incidentally, the support plate 15, like the flange 3 of the head housing 4, is tightly connected to the insulator 2. The support plate 15 has on its outer edge 18 feet 19 which are arranged, for example, offset at an angle of 90 °. The current transformer according to the invention is thus held over the feet 19 and the support plate 15.

Unten an der Stützplatte 15 hängt gas- oder flüssigkeitsdicht ein Kasten 20, der beispielsweise an der Stützplatte 15 angeschweißt ist. An der Wand des Kastens 20 ist ein Ringteil 21 aus Metall angeschweißt, das einen Dichtungsring 22 trägt. Oberhalb des Ringteiles 21 ist in einem von diesem Ringteil 21 und der Stützplatte 15 gebildeten Ringraum 23 ein Filter 24 untergebracht, das bei einer Füllung des Stromwandlers mit Gas in bekannter Weise die Feuchtigkeit bindet. An das Ringteil 21 ist von unten eine Durchführungsplatte 25 angeschraubt, wodurch der Raum oberhalb der Dichtungsplatte 25 gegenüber der freien Atmosphäre abgedichtet ist.At the bottom of the support plate 15 there is a gas-tight or liquid-tight box 20, which is welded to the support plate 15, for example. On the wall of the box 20, a ring part 21 made of metal is welded, which carries a sealing ring 22. A filter 24, which binds the moisture in a known manner when the current transformer is filled with gas, is accommodated above the ring part 21 in an annular space 23 formed by this ring part 21 and the support plate 15. A bushing plate 25 is screwed onto the ring part 21 from below, as a result of which the space above the sealing plate 25 is sealed off from the free atmosphere.

Diese Abdichtung ist erforderlich, weil der Innenraum des Isolators 2 und des Kopfgehäuses 4 gegenüber dem Raum oberhalb der Durchführungsplatte 25 innerhalb des Kastens 20 nicht abgedichtet ist ; vielmehr sind in der Stützplatte 15 bewußt mehrere Durchgangslöcher 26 vorhanden, die eine Verbindung herstellen. Dadurch kann infolge Konvektion das im Isolator 2 und im Kopfgehäuse 4 befindliche Gas in den Raum 27 des Kastens 20 eindringen, und das Filter 24 kann ihm die Feuchtigkeit entziehen.This seal is necessary because the interior of the insulator 2 and the head housing 4 is not sealed from the space above the feed-through plate 25 inside the box 20; rather, there are deliberately several through holes 26 in the support plate 15, which establish a connection. As a result, the gas located in the insulator 2 and in the head housing 4 can penetrate into the space 27 of the box 20 as a result of convection, and the filter 24 can extract the moisture from it.

Wie die Figur 1 erkennen läßt, hängt der Kasten 20 tatsächlich an der Stützplatte 15, reicht also weniger weit nach unten wie die Füße 19. Daher ist der Kasten 20 nur dem Druck des Isoliergases oder der Isolierflüssigkeit in seinem Raum 27 ausgesetzt und kann daher bezüglich seiner Wandung entsprechend bemessen werden. Tragfunktionen übt der Kasten 20 also nicht aus, so daß er bezüglich seiner Wand verhältnismäßig dünn bemessen sein kann.As can be seen in FIG. 1, the box 20 actually hangs on the support plate 15, that is to say does not reach as far down as the feet 19. Therefore, the box 20 is only exposed to the pressure of the insulating gas or the insulating liquid in its space 27 and can therefore relate to it be dimensioned according to its wall. The box 20 therefore does not have any supporting functions, so that it can be relatively thin in relation to its wall.

Die Durchführungsplatte 25 weist in dem dargestellten Ausführungsbeispiel vier Ausleitungen 38 auf. Fig. 2 bzw. 3 zeigen, daß jede Ausleitung über einen Kontaktstift 30 erfolgt, an dessen beide Enden 31 und 32 Anschlußdrähte 33 und 34 in der üblichen Weise festgeklemmt sind. Die Durchführungsplatte 25 ist als Kunststoff-Gußplatte ausgebildet und in der Weise hergestellt, daß vor dem Einbetten der Kontaktstifte 30 diese mit den Anschlußdrähten 33 und 34 versehen sind. Nach dem Verguß weisen also die eingebetteten Kontaktstifte 30 die Anschlußdrähte 33 und 34 auf und müssen daher nicht nachträglich festgeklemmt werden. Dies hat den großen Vorteil, daß die Kontaktstifte mechanisch nicht beansprucht werden, so daß Undichtigkeiten im Bereich der Kontaktstifte vermieden sind. Zur Verlängerung des Kriechweges zwischen benachbarten Kontaktstiften sind auf beiden Seiten der Durchführungsplatte 25 umlaufende Nuten 35 und 36 vorgesehen.The feed-through plate 25 has four diversions 38 in the exemplary embodiment shown. 2 and 3 show that each rejection takes place via a contact pin 30, at the two ends 31 and 32 of which connecting wires 33 and 34 are clamped in the usual manner. The feed-through plate 25 is designed as a cast plastic plate and is produced in such a way that the contact pins 30 are provided with the connecting wires 33 and 34 before the contact pins 30 are embedded. After the encapsulation, the embedded contact pins 30 thus have the connecting wires 33 and 34 and therefore do not have to be clamped subsequently. This has the great advantage that the contact pins are not mechanically stressed, so that leaks in the area of the contact pins are avoided. To extend the creepage distance between adjacent contact pins, circumferential grooves 35 and 36 are provided on both sides of the feed-through plate 25.

Bei der Montage des erfindungsgemäßen Wandlers werden die Anschlußdrähte 33 und 34 dann an Kontaktstellen 37 sowohl mit den sekundären Anschlußleitungen 38 der Sekundärwicklungen 9 und 10 als auch mit Verbindungsleitungen 39 zu in der Figur nicht mehr dargestellten Sekundärklemmen in einem Sekundärklemmenkasten 40 verbunden ; diese Verbindung erfolgt an den Stellen 41.When assembling the converter according to the invention, the connecting wires 33 and 34 are then connected at contact points 37 both to the secondary connecting lines 38 of the secondary windings 9 and 10 and also to connecting lines 39 to secondary terminals (not shown in the figure) in a secondary terminal box 40; this connection takes place at points 41.

Claims (5)

1. A gas- or liquid-insulated current transformer for high voltage comprising a head housing (4) which is arranged above an insulator (2) and through which passes a primary conductor (5) and in which, in a protective sleeve (6), there is arranged at least one iron core (7, 8) provided with a secondary winding (9, 10), wherein the protective sleeve is supported by a metal tube (12) which is arranged in the insulator (2) and is fixed to an upper support plate (15) of a base housing (18) located beneath the insulator, wherein the current transformer is braced at the outer edge of the support plate, and wherein a box (20) provided with ducts is suspended from the lower part of the support plate, characterised in that the box (20) is fixed in gas- and liquid-tight manner, to the support plate (15), which is provided with feet (19), and at the bottom, is tightly sealed by a lead-through plate (25) which carries the ducts ; and that the interior (27) of the box (20) is connected to the interior of the insulator (2) and of the head housing by way of through-openings (26) in the support plate (15).
2. A current transformer according to Claim 1, characterised in that an annular filter (24) is arranged in the interior of the box (20) above the lead-through plate (25).
3. A current transformer according to Claim 1 or Claim 2, characterised in that the filter (24) is located in an annular chamber (23) which is formed, on the one hand, by the support plate (15) and, on the other hand, by an annular member (21) which is welded to the box (20) ; and that the lead-through plate (25) is attached to the annular member (21) with an interposed sealing ring (22).
4. A current transformer according to one of the preceding Claims, characterised in that a terminal box (40) which accommodates the secondary terminals is attached to the box (20).
5. A current transformer according to one of the preceding Claims, characterised in that the lead-through plate consists of a cast synthetic resin plate (25) into which contact pins (30), provided with connection wires (33, 34), are embedded prior to casting.
EP81730027A 1980-03-27 1981-03-09 Current transformer having fluid insulant Expired EP0037796B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81730027T ATE6448T1 (en) 1980-03-27 1981-03-09 GAS OR LIQUID ISOLATED CURRENT TRANSFORMER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8008660U 1980-03-27
DE8008660 1980-03-27

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EP0037796A1 EP0037796A1 (en) 1981-10-14
EP0037796B1 true EP0037796B1 (en) 1984-02-29

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EP81730027A Expired EP0037796B1 (en) 1980-03-27 1981-03-09 Current transformer having fluid insulant

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EP (1) EP0037796B1 (en)
AT (1) ATE6448T1 (en)

Cited By (3)

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CN105448509A (en) * 2015-12-03 2016-03-30 成都格瑞思文化传播有限公司 High-voltage current transformer
CN107275065A (en) * 2017-08-13 2017-10-20 安徽君华舜义恩佳非晶材料有限公司 It is a kind of to be easily installed the current transformer used
CN111986883A (en) * 2020-06-19 2020-11-24 阳光电源股份有限公司 Solid-state transformer and preparation method thereof

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NL8300513A (en) * 1983-02-11 1984-09-03 Philips Nv HIGH FREQUENCY COIL WITH CONNECT PINS.
FR2671670B1 (en) * 1991-01-10 1993-04-09 Avocat Jean Paul HIGH VOLTAGE CONNECTION TERMINAL.
DE4232090C1 (en) * 1992-09-25 1994-04-07 Loewe Opta Gmbh HV transformer for display monitor or TV receiver CRT - has transformer windings carried by plastics former enclosed by sealed housing filled with insulation liquid.
FR2820540A1 (en) * 2001-02-07 2002-08-09 Alstom ARRANGEMENT FOR ASSEMBLING AN ELECTRICALLY CONDUCTIVE BAR CROSSING THROUGHOUT A METAL TANK AND METHOD OF IMPLEMENTING
CN104124047A (en) * 2013-04-25 2014-10-29 国家电网公司 Current transformer and current transformer base
PL2800113T3 (en) * 2013-04-29 2016-09-30 High voltage dry instrument transformer
CN104360129A (en) * 2014-11-05 2015-02-18 中国西电电气股份有限公司 Electromagnetic current transformer body structure with internal support

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DE723869C (en) * 1930-03-26 1942-08-12 Koch & Sterzel Ag Measuring transformer device for simultaneous measurement of current and voltage
GB567789A (en) * 1943-08-27 1945-03-02 John Harold Buchanan Improvements in or relating to oil- or liquid-immersed electric transformers and other apparatus for use on high voltage circuits
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CN105448509A (en) * 2015-12-03 2016-03-30 成都格瑞思文化传播有限公司 High-voltage current transformer
CN107275065A (en) * 2017-08-13 2017-10-20 安徽君华舜义恩佳非晶材料有限公司 It is a kind of to be easily installed the current transformer used
CN107275065B (en) * 2017-08-13 2019-04-23 北京北斗银河科技有限公司 It is a kind of to be easily installed the current transformer used
CN111986883A (en) * 2020-06-19 2020-11-24 阳光电源股份有限公司 Solid-state transformer and preparation method thereof

Also Published As

Publication number Publication date
EP0037796A1 (en) 1981-10-14
ATE6448T1 (en) 1984-03-15

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