EP0041917B1 - Inductive-voltage transformer for a fully insulated, metal-enclosed high-voltage switchgear - Google Patents

Inductive-voltage transformer for a fully insulated, metal-enclosed high-voltage switchgear Download PDF

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Publication number
EP0041917B1
EP0041917B1 EP81730049A EP81730049A EP0041917B1 EP 0041917 B1 EP0041917 B1 EP 0041917B1 EP 81730049 A EP81730049 A EP 81730049A EP 81730049 A EP81730049 A EP 81730049A EP 0041917 B1 EP0041917 B1 EP 0041917B1
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EP
European Patent Office
Prior art keywords
voltage transformer
high voltage
active system
metal
voltage
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Expired
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EP81730049A
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German (de)
French (fr)
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EP0041917A3 (en
EP0041917A2 (en
EP0041917B2 (en
Inventor
Jürgen Dr.-Ing. Moeller
Manfred Dr.-Ing. Weniger
Werner Keil
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Siemens AG
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Siemens AG
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Priority to AT81730049T priority Critical patent/ATE12437T1/en
Publication of EP0041917A2 publication Critical patent/EP0041917A2/en
Publication of EP0041917A3 publication Critical patent/EP0041917A3/en
Publication of EP0041917B1 publication Critical patent/EP0041917B1/en
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Publication of EP0041917B2 publication Critical patent/EP0041917B2/en
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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
    • H01F38/24—Voltage transformers
    • H01F38/26—Constructions

Definitions

  • the invention is based on an inductive voltage converter for a fully insulated, metal-enclosed high-voltage switchgear assembly with a boiler that can be flanged onto the metal capsule of the switchgear assembly, in which the active system of the voltage converter is located and in which a high-voltage supply line ends.
  • the high-voltage winding of the active system is encompassed by an annular high-voltage electrode.
  • a high-voltage lead is mechanically and electrically connected to the high-voltage electrode.
  • the high-voltage supply line is attached to a boiler isolator.
  • the invention has for its object to improve an inductive voltage converter for a fully insulated, metal-encapsulated high-voltage switchgear so that mechanical damage to the converter cannot occur even under abnormal operating conditions with an impending large current through the primary winding.
  • a resistance device is located in the boiler, which extends from the high-voltage feed line to the active system; the resistance device consists of a columnar structure of a plurality of mass resistance elements which are held together by means of pressure plates located at the ends of the columnar structure, of which one pressure plate is attached to the high-voltage supply line and the other pressure plate is connected to the active system.
  • inductive voltage transformers connected to cables can be supplied with such a large current on the primary side during discharge processes that not only thermal but also mechanical overloading of the voltage transformer occurs; the mechanical overload can become so great that the entire inductive voltage converter is permanently damaged. If a resistance device that extends from the high-voltage supply line to the active system is accommodated in the boiler of an inductive voltage converter for fully insulated, metal-enclosed high-voltage switchgear, then the current through the primary winding of the voltage converter is reduced and mechanical overload is thus avoided.
  • the boiler of the voltage converter does not need to be enlarged because of the resistance device, because it is generally between the active system and that facing the switchgear There is sufficient space at the end of the boiler to accommodate the resistance device.
  • the voltage converter according to the invention is inexpensive in terms of high voltage and mechanically very firm.
  • the one pressure plate advantageously carries a threaded pin which is received by a threaded bore in the high-voltage supply line.
  • a plug device is attached to the active system at the point facing the resistance device, and the other pressure plate has a recess; the plug device engages in the recess.
  • the recess in the other pressure plate is cylindrical and widens in a funnel shape towards the active system.
  • the resistance device according to the invention can in principle be used in all inductive voltage converters for fully insulated metal-encapsulated high-voltage switchgear, regardless of the particular structure or design of the active system.
  • the resistance device can be used in a voltage converter with a high-voltage electrode coaxially encompassing the high-voltage winding of the active system if the resistance device is located between the high-voltage feed line and the high-voltage electrode.
  • the high-voltage electrode can be provided with the plug device in a structurally simple manner, so that overall a simple structure is achieved despite the use of the resistance device.
  • each successive resistance element which is provided with two equally high press-in on different sides; the pressings are cyclically offset in the subsequent metal disks in the lateral direction in such a way that a helical arrangement of the mass resistance elements is produced.
  • a relatively low overall height can be achieved, which is particularly advantageous in view of the limited space in the boiler of an inductive voltage converter.
  • the metal disks on each side have the press-in diametrically opposite at least one further press-in for receiving an insulating spacer element.
  • two further press-ins are provided, as a result of which the individual metal disks press against one another when pressure is exerted on the pressure plates, forming a straight columnar structure.
  • the metal disks also advantageously have three through holes, offset by 120 "from one another, through each of which a clamping bolt made of insulating material is guided; the clamping bolts clamp the pressure plates together. In this way, a mechanically fixed configuration of the resistance device is achieved.
  • the clamping bolts made of insulating material are advantageously held in one pressure plate by pins which engage in transverse bores of the clamping bolts.
  • the clamping bolts advantageously carry threaded bushes onto which nuts are screwed for bracing.
  • the active system 2 of the inductive voltage converter is accommodated in a boiler 1 shown only partially in FIG. 1. 1 of the active system 2, only part of an iron core 3 and a high-voltage electrode 4 are shown, which comprise an undetectable high-voltage winding on the outside. On the high-voltage electrode 4, a plug device 5 is attached on the outside, which provides an electrical connection to a Resistance device 6 creates.
  • the resistance device 6 contains a pressure plate 7 at its upper end in FIG. 1 and a further pressure plate 8 at its lower end in FIG. 1. Between the pressure plates 7 and 8 there are a plurality of round metal disks 9, between each of which a mass resistance element 10 is housed.
  • the resistance device 6 is held together by three clamping bolts 11 made of insulating material, which are guided through through holes 12, 13 and 14 of the metal disks 9, which are each offset by 120 ° (cf. also FIGS. 2 and 3).
  • each of the clamping bolts 11 is guided in through holes 15 in one pressure plate 7 and held there by pins 16 which are guided through transverse bores 17.
  • the clamping bolts 11 are each provided with a threaded bushing 18 (see FIG. 3).
  • the threaded bushings 18 can be glued to the clamping bolts.
  • a nut 20 is screwed onto the threaded bushings 18 and, as a result, a clamping force is exerted on the pressure plates 7 and 8 and thus also on the metal disks 9 and the mass resistance elements. This creates a resistance device 6 with a relatively high mechanical strength.
  • the other pressure plate 8 has a recess 21 which is cylindrical and extends in a funnel shape towards the high-voltage electrode 4. This simplifies the insertion of the plug device 5 into the recess 21 when the inductive voltage converter is being installed.
  • the one pressure plate 7 is provided with a threaded pin 22 which is received by a threaded bore 23 of a high-voltage supply line 24.
  • the threaded pin 22 thus provides a secure mechanical and galvanic connection of the resistance device 6 to the high-voltage supply line 24.
  • the high-voltage supply line 24 in turn is embedded in an insulator 25, which is held on an end plate 28 by means of a pressure ring 26 with a sealing ring 27 interposed therebetween.
  • This end plate 28 is screwed to a flange 30 of the boiler 1 with the interposition of a further sealing ring 29.
  • each individual metal disc 9 has its different which sides each have an indentation 31 or 32.
  • These press-in are offset by 120 ° on the metal disc 9 and are each designed such that they are each once concave and convex when viewed from one side.
  • These spacer elements are designed in accordance with the height of the mass resistance elements in their length and ensure that when the resistance device 6 is compressed, the individual metal disks 9 lie parallel to one another and do not tilt.
  • the individual metal disks 9 are each stacked on top of one another such that successive metal disks are cyclically offset in the lateral direction in such a way that a helical arrangement of the mass of resistance elements 10 is formed.
  • a concave pressing in of a disk is opposed to a convex pressing in of the next following disk, as a result of which the individual mass resistance elements are held securely.
  • a mechanically very stable resistance device with a relatively low overall height is achieved.
  • the voltage converter described also maintains its mechanical structure in the event of large currents threatening in the event of abnormal operating conditions, this property being achieved without lasting structural changes.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Breakers (AREA)
  • Surgical Instruments (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Transformers For Measuring Instruments (AREA)

Abstract

1. An inductive voltage transformer for a fully insulated, metal-encased high voltage switch-gear comprising a vessel (1) which can be flangedly attached to the metal casing of the switch-gear, and in which the active system (2) of the voltage transformer is located, and a high voltage supply line (24) terminates, characterized in that within the vessel (1), there is arranged a resistance arrangement (6) which extens from the high voltage supply line (24) to the active system ; that the resistance arrangement (6) consists of a column-shaped structure formed of a plurality of composite resistance elements (10) which are held together by means of pressure plates (7, 8) arranged at the ends of the column-shaped structure, one of which pressure plates (7) is attached to the high voltage supply line (24) and the other of which pressure plates (8) is connected to the active system (2).

Description

Die Erfindung geht von einem induktiven Spannungswandler für eine vollisolierte, metallgekapselte Hochspannungsschaltanlage mit einem an die Metallkapsel der Schaltanlage anflanschbaren Kessel aus, in dem sich das aktive System des Spannungswandlers befindet und in dem eine Hochspannungszuleitung endet.The invention is based on an inductive voltage converter for a fully insulated, metal-enclosed high-voltage switchgear assembly with a boiler that can be flanged onto the metal capsule of the switchgear assembly, in which the active system of the voltage converter is located and in which a high-voltage supply line ends.

Bei einem bekannten induktiven Spannungswandler dieser Art (DE-B-2 452 056) ist die Hochspannungswicklung des aktiven Systems von einer ringförmigen Hochspannungselektrode umfaßt. Mit der Hochspannungselektrode ist eine Hochspannungszuleitung mechanisch und elektrisch verbunden. Die Hochspannungszuleitung ist in einem Abschlußisolator des Kessels befestigt.In a known inductive voltage converter of this type (DE-B-2 452 056), the high-voltage winding of the active system is encompassed by an annular high-voltage electrode. A high-voltage lead is mechanically and electrically connected to the high-voltage electrode. The high-voltage supply line is attached to a boiler isolator.

Der Erfindung liegt die Aufgabe zugrunde, einen induktiven Spannungswandler für eine vollisolierte, metallgekapselte Hochspannungsschaltanlage so zu verbessern, daß auch bei anormalen Betriebszuständen mit drohendem großem Strom durch die Primärwicklung eine mechanische Beschädigung des Wandlers nicht auftreten kann.The invention has for its object to improve an inductive voltage converter for a fully insulated, metal-encapsulated high-voltage switchgear so that mechanical damage to the converter cannot occur even under abnormal operating conditions with an impending large current through the primary winding.

Zur Lösung dieser Aufgabe befindet sich bei einem induktiven Spannungswandler der eingangs angegebenen Art erfindungsgemäß im Kessel eine Widerstandseinrichtung, die sich von der Hochspannungszuleitung zum aktiven System erstreckt; die Widerstandseinrichtung besteht aus einem säulenförmigen Aufbau mehrerer Massewiderstandselemente, die mittels an den Enden des säulenförmigen Aufbaus befindlicher Druckplatten zusammengehalten sind, von denen die eine Druckplatte an der Hochspannungszuleitung befestigt und die andere Druckplatte mit dem aktiven System verbunden ist.To achieve this object, in the case of an inductive voltage converter of the type specified at the outset, a resistance device is located in the boiler, which extends from the high-voltage feed line to the active system; the resistance device consists of a columnar structure of a plurality of mass resistance elements which are held together by means of pressure plates located at the ends of the columnar structure, of which one pressure plate is attached to the high-voltage supply line and the other pressure plate is connected to the active system.

Insbesondere an Kabel angeschlossene, induktive Spannungswandler können bei Entladungsvorgängen primärseitig mit einem derart großen Strom beaufschlagt werden, daß nicht nur thermische, sondern auch mechanische Überlastung des Spannungswandlers eintritt; die mechanische Überlastung kann dabei so groß werden, daß der gesamte induktive Spannungswandler nachhaltig beschädigt wird. Wird im Kessel eines induktiven Spannungswandlers für vollisolierte, metallgekapselte Hochspannungsschaltanlagen eine Widerstandseinrichtung untergebracht, die sich von der Hochspannungszuleitung zum aktiven System erstreckt, dann wird dadurch der Strom durch die Primärwicklung des Spannungswandlers verringert und damit auch eine mechanische Überlastung vermieden. Durch die Unterbringung der Widerstandseinrichtung in der Weise, daß sie sich von der Hochspannungszuleitung zum aktiven System erstreckt, ist erreicht, daß der Kessel des Spannungswandlers wegen der Widerstandseinrichtung nicht vergrößert zu werden braucht, weil in der Regel zwischen dem aktiven System und dem der Schaltanlage zugewandten Ende des Kessels ausreichend Raum zur Unterbringung der Widerstandseinrichtung vorhanden ist. Darüber hinaus ist der erfindungsgemäße Spannungswandler wegen des säulenförmigen Aufbaues seiner Widerstandseinrichtung hochspan - nungstechnisch günstig und mechanisch sehr fest ausgeführt.In particular, inductive voltage transformers connected to cables can be supplied with such a large current on the primary side during discharge processes that not only thermal but also mechanical overloading of the voltage transformer occurs; the mechanical overload can become so great that the entire inductive voltage converter is permanently damaged. If a resistance device that extends from the high-voltage supply line to the active system is accommodated in the boiler of an inductive voltage converter for fully insulated, metal-enclosed high-voltage switchgear, then the current through the primary winding of the voltage converter is reduced and mechanical overload is thus avoided. By accommodating the resistance device in such a way that it extends from the high-voltage feed line to the active system, it is achieved that the boiler of the voltage converter does not need to be enlarged because of the resistance device, because it is generally between the active system and that facing the switchgear There is sufficient space at the end of the boiler to accommodate the resistance device. In addition, because of the columnar structure of its resistance device, the voltage converter according to the invention is inexpensive in terms of high voltage and mechanically very firm.

Es ist zwar bekannt (DE-B-1 077 319), in Reihe mit der Primärwicklung von induktiven Spannungswandlern Dämpfungswiderstände anzuordnen, jedoch bezieht sich diese Druckschrift vor allem auf die schaltungsmäßige Anordnung solcher Widerstände; detaillierte Angaben über eine vorteilhafte räumliche Anordnung und Ausführung eines solchen Dämpfungswiderstandes bei induktiven Spannungswandlern für vollisolierte, metallgekapselte Hochspannungsschaltanlagen finden sich in dieser Druckschrift nicht.Although it is known (DE-B-1 077 319) to arrange damping resistors in series with the primary winding of inductive voltage converters, this document primarily relates to the circuit arrangement of such resistors; There is no detailed information on an advantageous spatial arrangement and design of such a damping resistor in inductive voltage converters for fully insulated, metal-encapsulated high-voltage switchgear.

Um eine feste mechanische Verbindung der Widerstandseinrichtung mit der Hochspannungszuleitung zu erreichen, trägt die eine Druckplatte vorteilhafterweise einen Gewindezapfen, der von einer Gewindebohrung in der Hochspannungszuleitung aufgenommen ist.In order to achieve a firm mechanical connection of the resistance device with the high-voltage supply line, the one pressure plate advantageously carries a threaded pin which is received by a threaded bore in the high-voltage supply line.

Um einen möglichst einfachen montierbaren, induktiven Spannungswandler zu erhalten, ist gemäß einer Weiterbildung des erfindungsgemäßen Spannungswandlers an dem aktiven System an der der Widerstandseinrichtung zugewandten Stelle eine Steckereinrichtung angebracht, und die andere Druckplatte weist eine Ausnehmung auf; die Steckereinrichtung greift in die Ausnehmung ein. Bei der Montage des erfindungsgemäßen Spannungswandlers muß dann an der Stelle zwischen der Widerstandseinrichtung und dem aktiven System lediglich eine Steckverbindung hergestellt werden.In order to obtain an inductive voltage converter that is as simple as possible to assemble, according to a development of the voltage converter according to the invention, a plug device is attached to the active system at the point facing the resistance device, and the other pressure plate has a recess; the plug device engages in the recess. When installing the voltage converter according to the invention then only a plug connection must be made at the point between the resistance device and the active system.

Um einerseits eine sicher wirkende Steckverbindung zu erreichen, und um andererseits die Steckverbindung ohne Schwierigkeiten zustande bringen zu können, ist die Ausnehmung in der anderen Druckplatte zylindrisch und erweitert sich zum aktiven System hin trichterförmig.In order on the one hand to achieve a securely acting plug connection and on the other hand to be able to bring the plug connection into effect without difficulty, the recess in the other pressure plate is cylindrical and widens in a funnel shape towards the active system.

Die Widerstandseinrichtung gemäß der Erfindung läßt sich grundsätzlich bei allen induktiven Spannungswandlern für vollisolierte metallgekapselte Hochspannungsschaltanlagen unabhängig von dem jeweiligen Aufbau bzw. der konstruktiven Ausgestaltung des aktiven Systems anwenden. In besonders vorteilhafter Weise läßt sich die Widerstandseinrichtung bei einem Spannungswandler mit einer die Hochspannungswicklung des aktiven Systems koaxial umfassenden Hochspannungselektrode einsetzen, wenn die Widerstandseinrichtung zwischen der Hochspannungszuleitung und der Hochspannungselektrode liegt. In diesem Falle kann die Hochspannungselektrode in konstruktiv einfacher Weise mit der Steckereinrichtung versehen werden, so daß insgesamt ein einfacher Aufbau trotz Einsatzes der Widerstandseinrichtung erzielt ist.The resistance device according to the invention can in principle be used in all inductive voltage converters for fully insulated metal-encapsulated high-voltage switchgear, regardless of the particular structure or design of the active system. In a particularly advantageous manner, the resistance device can be used in a voltage converter with a high-voltage electrode coaxially encompassing the high-voltage winding of the active system if the resistance device is located between the high-voltage feed line and the high-voltage electrode. In this case, the high-voltage electrode can be provided with the plug device in a structurally simple manner, so that overall a simple structure is achieved despite the use of the resistance device.

Als besonders vorteilhaft wird es angesehen, wenn bei der Widerstandseinrichtung zwischen zwei im säulenförmigen Aufbau jeweils aufeinanderfolgenden Widerstandselementen eine runde Metallscheibe liegt, die mit zwei gleich hohen Einpressungen auf verschiedenen Seiten versehen ist; die Einpressungen sind in aufeinan der folgenden Metallscheiben in seitlicher Richtung zyklisch derart versetzt, daß eine wendel förmige Anordnung der Massewiderstandselemente entsteht. Mit einer derart ausgebildeten Widerstandseinrichtung ist eine relativ geringe Bauhöhe erzielbar, was im Hinblick auf die beengten Platzverhältnisse im Kessel eines induktiven Spannungswandlers besonders vorteilhaft ist.It is considered particularly advantageous if the resistance device between a circular metal disc lies in the columnar structure, each successive resistance element, which is provided with two equally high press-in on different sides; the pressings are cyclically offset in the subsequent metal disks in the lateral direction in such a way that a helical arrangement of the mass resistance elements is produced. With such a resistance device, a relatively low overall height can be achieved, which is particularly advantageous in view of the limited space in the boiler of an inductive voltage converter.

Eine wendelförmige Anordnung von Widerstandselementen mit dazwischenliegenden, runden Metallscheiben ist zwar bekannt (DE-C-1 015 909 und FR-A-1 318 052), jedoch handelt es sich bei den bekannten Anordnungen nicht um Vorwiderstände für induktive Spannungswandler, sondern um speziell ausgebildete Überspannungsableiter.Although a helical arrangement of resistance elements with intermediate, round metal disks is known (DE-C-1 015 909 and FR-A-1 318 052), the known arrangements are not series resistors for inductive voltage converters, but rather specially designed ones Surge arresters.

Bei der Widerstandseinrichtung weisen die Metallscheiben auf jeder Seite den Einpressungen diametral gegenüber mindestens eine weitere Einpressung zur Aufnehmung eines isolierenden Abstandselementes auf. Vorteilhafterweise sind zwei weitere Einpressungen vorgesehen, wodurch erreicht ist, daß sich die einzelnen Metallscheiben bei Druckausübung auf die Druckplatten unter Ausbildung eines geraden säulenförmigen Aufbaus gegeneinander pressen.In the resistance device, the metal disks on each side have the press-in diametrically opposite at least one further press-in for receiving an insulating spacer element. Advantageously, two further press-ins are provided, as a result of which the individual metal disks press against one another when pressure is exerted on the pressure plates, forming a straight columnar structure.

Die Metallscheiben weisen ferner vorteilhafterweise drei um 120" gegeneinander versetzte Durchgangslöcher auf, durch die jeweils ein Spannbolzen aus Isolierwerkstoff geführt ist; die Spannbolzen verspannen die Druckplatten miteinander. Auf diese Weise ist ein mechanisch feste Ausgestaltung der Widerstandseinrichtung erreicht.The metal disks also advantageously have three through holes, offset by 120 "from one another, through each of which a clamping bolt made of insulating material is guided; the clamping bolts clamp the pressure plates together. In this way, a mechanically fixed configuration of the resistance device is achieved.

Die Spannbolzen aus Isolierwerkstoff sind in der einen Druckplatte vorteilhafterweise durch Stifte gehalten, die in Querbohrungen der Spannbolzen eingreifen. Im Bereich der anderen Druckplatte tragen die Spannbolzen vorteilhafterweise Gewindebuchsen, auf die zur Verspannung Muttern aufgeschraubt sind.The clamping bolts made of insulating material are advantageously held in one pressure plate by pins which engage in transverse bores of the clamping bolts. In the area of the other pressure plate, the clamping bolts advantageously carry threaded bushes onto which nuts are screwed for bracing.

Um einen hochspannungstechnisch günstigen Aufbau der Widerstandseinrichtung zu erreichen, sind die Metallscheiben am Rande vorteilhafterweise mit einem umlaufenden Wulst versehen. Zur Erläuterung der Erfindung ist in

  • Fig. 1 ein Ausführungsbeispiel des erfindungsgemäßen induktiven Spannungswandlers mit seinen im Zusammenhang mit der Erfindung wesentlichen Teilen in
  • Fig.2 ein Schnitt durch die eine Druckplatte der Widerstandseinrichtung, in
  • Fig. 3 ein Schnitt durch die andere Druckplatte der Widerstandseinrichtung, in
  • Fig. 4 eine Draufsicht auf eine Metallscheibe der Widerstandseinrichtung, und in
  • Fig. 5 ein Schnitt durch die Metallscheibe wiedergegeben.
In order to achieve a high-voltage construction of the resistance device, the metal disks are advantageously provided with a circumferential bead on the edge. To explain the invention is in
  • Fig. 1 shows an embodiment of the inductive voltage converter according to the invention with its essential parts in connection with the invention in
  • 2 shows a section through the one pressure plate of the resistance device, in
  • Fig. 3 shows a section through the other pressure plate of the resistance device, in
  • Fig. 4 is a plan view of a metal disc of the resistance device, and in
  • Fig. 5 shows a section through the metal disc.

In einem in der Fig. 1 nur teilweise dargestellten Kessel 1 ist das aktive System 2 des induktiven Spannungswandlers untergebracht. Von dem aktiven System 2 ist in der Fig. 1 nur ein Teil eines Eisenkernes 3 und eine Hochspannungselektrode 4 dargestellt, die eine nicht erkennbare Hochspannungswic(clung außen umfaßt. An der Hochspannungselektrode 4 ist außen eine Steckereinrichtung 5 angebracht, die eine elektrische Verbindung zu einer Widerstandseinrichtung 6 schafft.The active system 2 of the inductive voltage converter is accommodated in a boiler 1 shown only partially in FIG. 1. 1 of the active system 2, only part of an iron core 3 and a high-voltage electrode 4 are shown, which comprise an undetectable high-voltage winding on the outside. On the high-voltage electrode 4, a plug device 5 is attached on the outside, which provides an electrical connection to a Resistance device 6 creates.

Die Widerstandseinrichtung 6 enthält an ihrem in der Fig. 1 oberen Ende eine Druckplatte 7 und an ihrem in der Fig. 1 unteren Ende eine weitere Druckplatte 8. Zwischen den Druckplatten 7 und 8 befinden sich mehrere runde Metallscheiben 9, zwischen denen jeweils ein Massewiderstandselement 10 untergebracht ist. Die Widerstandseinrichtung 6 wird durch drei Spannbolzen 11 aus Isolierwerkstoff zusammengehalten, die durch jeweils um 120° gegeneinander versetzte Durchgangslöcher 12, 13 und 14 der Metallscheiben 9 (vgl. auch die Fig. 2 und 3) geführt sind.The resistance device 6 contains a pressure plate 7 at its upper end in FIG. 1 and a further pressure plate 8 at its lower end in FIG. 1. Between the pressure plates 7 and 8 there are a plurality of round metal disks 9, between each of which a mass resistance element 10 is housed. The resistance device 6 is held together by three clamping bolts 11 made of insulating material, which are guided through through holes 12, 13 and 14 of the metal disks 9, which are each offset by 120 ° (cf. also FIGS. 2 and 3).

Wie aus Fig. 2 hervorgeht, ist jeder der Spannbolzen 11 in Durchgangslöchern 15 in der einen Druckplatte 7 geführt und dort durch Stifte 16 gehalten, die durch Querbohrungen 17 geführt sind. Im Bereich der anderen Druckplatte 8 sind die Spannbolzen 11 mit jeweils einer Gewindebuchse 18 (vgl. Fig. 3) versehen. Die Gewindebuchsen 18 können auf die Spannbolzen aufgeklebt sein. Unter Zwischenlage von Tellerfedern 19 wird auf die Gewindebuchsen 18 eine Mutter 20 geschraubt und dadurch eine Spannkraft auf die Druckplatten 7 und 8 und damit auch auf die Metallscheiben 9 und die Massewiderstandselemente ausgeübt. Es entsteht somit eine Widerstandseinrichtung 6 mit einer relativ großen mechanischen Festigkeit.As can be seen from FIG. 2, each of the clamping bolts 11 is guided in through holes 15 in one pressure plate 7 and held there by pins 16 which are guided through transverse bores 17. In the area of the other pressure plate 8, the clamping bolts 11 are each provided with a threaded bushing 18 (see FIG. 3). The threaded bushings 18 can be glued to the clamping bolts. With the interposition of disc springs 19, a nut 20 is screwed onto the threaded bushings 18 and, as a result, a clamping force is exerted on the pressure plates 7 and 8 and thus also on the metal disks 9 and the mass resistance elements. This creates a resistance device 6 with a relatively high mechanical strength.

Aus Fig. 3 ist ferner entnehmbar, daß die andere Druckplatte 8 eine Ausnehmung 21 aufweist, die zylindrisch verläuft und sich zur Hochspannungselektrode 4 hin trichterförmig erweitert. Dadurch ist das Einführen der Steckereinrichtung 5 in die Ausnehmung 21 bei der Montage des induktiven Spannungswandlers erleichtert.From Fig. 3 it can also be seen that the other pressure plate 8 has a recess 21 which is cylindrical and extends in a funnel shape towards the high-voltage electrode 4. This simplifies the insertion of the plug device 5 into the recess 21 when the inductive voltage converter is being installed.

Wie aus Fig. 2 hervorgeht, ist die eine Druckplatte 7 mit einem Gewindezapfen 22 versehen, der von einer Gewindebohrung 23 einer Hochspannungszuleitung 24 aufgenommen ist. Über den Gewindezapfen 22 erfolgt somit eine sichere mechanische und galvanische Verbindung der Widerstandseinrichtung 6 mit der Hochspannungszuleitung 24. Die Hochspannungszuleitung 24 ihrerseits ist in einem Isolator 25 eingebettet, der mittels eines Druckringes 26 unter Zwischenlage eines Dichtringes 27 an einer Abschlußplatte 28 gehalten ist. Diese Abschlußplatte 28 ist unter Zwischenlage eines weiteren Dichtungsringes 29 mit einem Flansch 30 des Kessels 1 verschraubt.As is apparent from FIG. 2, the one pressure plate 7 is provided with a threaded pin 22 which is received by a threaded bore 23 of a high-voltage supply line 24. The threaded pin 22 thus provides a secure mechanical and galvanic connection of the resistance device 6 to the high-voltage supply line 24. The high-voltage supply line 24 in turn is embedded in an insulator 25, which is held on an end plate 28 by means of a pressure ring 26 with a sealing ring 27 interposed therebetween. This end plate 28 is screwed to a flange 30 of the boiler 1 with the interposition of a further sealing ring 29.

Wie die Fig. 4 und 5 im einzelnen zeigen, weist jede einzelne Metallscheibe 9 auf ihren verschiedenen Seiten jeweils eine Einpressung 31 bzw. 32 auf. Diese Einpressungen sind um 120° versetzt auf der Metallscheibe 9 angebracht und sind jeweils so ausgebildet, daß sie von einer Seite aus betrachtet jeweils einmal konkav und einmal konvex gestaltet sind. Diametral den Einpressungen 31 und 32 gegenüber sind jeweils zwei weitere Einpressungen 33 und 34 vorhanden, die zur Aufnahme von nicht dargestellten zylindrischen Abstandselementen aus Isolierwerkstoff dienen. Diese Abstandselemente sind entsprechend der Höhe der Massewiderstandselemente in ihrer Länge ausgebildet und sorgen dafür, daß bei einem Zusammendrücken der Widerstandseinrichtung 6 die einzelnen Metallscheiben 9 parallel zueinander liegen und nicht verkanten.As shown in FIGS. 4 and 5 in detail, each individual metal disc 9 has its different which sides each have an indentation 31 or 32. These press-in are offset by 120 ° on the metal disc 9 and are each designed such that they are each once concave and convex when viewed from one side. Diametrically opposite the press-in 31 and 32 there are two further press-in 33 and 34, which serve to accommodate cylindrical spacing elements, not shown, made of insulating material. These spacer elements are designed in accordance with the height of the mass resistance elements in their length and ensure that when the resistance device 6 is compressed, the individual metal disks 9 lie parallel to one another and do not tilt.

Bei der Bildung der Widerstandseinrichtung 6 werden die einzelnen Metallscheiben 9 jeweils so aufeinandergeschichtet, daß aufeinanderfolgende Metallscheiben in seitlicher Richtung zyklisch derart versetzt sind, daß eine wendelförmige Anordnung der Masse Widerstandselemente 10 gebildet ist. Bei dieser Anordnung steht jeweils einer konkaven Einpressung einer Scheibe eine konvexe Einpressung der nächstfolgenden Scheibe gegenüber, wodurch die einzelnen Massewiderstandselemente sicher gehalten sind. Vor allem jedoch ist eine mechanisch sehr stabile Widerstandseinrichtung mit verhältnismäßig geringer Bauhöhe erreicht.When the resistance device 6 is formed, the individual metal disks 9 are each stacked on top of one another such that successive metal disks are cyclically offset in the lateral direction in such a way that a helical arrangement of the mass of resistance elements 10 is formed. In this arrangement, a concave pressing in of a disk is opposed to a convex pressing in of the next following disk, as a result of which the individual mass resistance elements are held securely. Above all, however, a mechanically very stable resistance device with a relatively low overall height is achieved.

Der beschriebene Spannungswandler behält auch bei im Falle anormaler Betriebszustände drohenden großen Strömen seinen mechanischen Aufbau bei, wobei diese Eigenschaft ohne nachhaltige konstruktive Änderungen erreicht ist.The voltage converter described also maintains its mechanical structure in the event of large currents threatening in the event of abnormal operating conditions, this property being achieved without lasting structural changes.

Claims (12)

1. An inductive voltage transformer for a fully insulated, metal-encased high voltage switch gear, comprising a vessel (1) which can be flan- gedly attached to the metal casing of the switch- gear, and in which the active system (2) of the voltage transformer is located, and a high voltage supply line (24) terminates, characterised in that within the vessel (1), there is arranged a resistance arrangement (6) which extends from the high voltage supply line (24) to the active system; that the resistance arrangement (6) consists of a column-shaped structure formed of a plurality of composite resistance elements (10) which are held together by means of pressure plates (7, 8) arranged at the ends of the column-shaped structure, one of which pressure plates (7) is attached to the high voltage supply line (24) and the other of which pressure plates (8) is connected to the active system (2).
2. A voltage transformer as claimed in claim 1, characterised in that the one pressure plate (7) has a threaded stem (22) which is received by a threaded bore (23) in the high voltage supply line (24).
3. A voltage transformer as claimed in claim 2, characterised in that the active system (2) is provided with plug means (5) at the location facing towards the resistance arrangement (6); that the other pressure plate (8) has a recess (21); and that the plug means (5) engages into the recess (21
4. A voltage transformer as claimed in claim 3, characterised in that the recess (21) is cylindrical and widens in the form of a funnel towards the active system.
5. A voltage transformer as claimed in one of the preceding claims having a high voltage electrode which coaxially embraces the high voltage winding of the active system, characterised in that the resistance arrangement (6) is arranged between the high voltage supply line (24) and the high voltage electrode (4).
6. A voltage transformer as claimed in claim 5, characterised in that the high voltage electrode (4) carries the plug means (5).
7. A voltage transformer as claimed in one of the preceding claims, characterised in that, between two composite resistance elements (10) which succeed one another in the column-shaped structure, there is arranged a circular metal disc (9) which is provided with two dimples (31, 32) of equal height, on opposite sides thereof; and that the dimples (31, 32) in successive metal discs (9) are cyclically offset in the lateral direction in such a way that a helical arrangement of the composite resistance elements (10) results.
8. A voltage transformer as claimed in claim 7, characterised in that diametrically opposite the dimples (31, 32) on either side, the metal discs (9) are provided with at least one further dimple (33, 34) which serves to accommodate an insulating spacing element.
9. A voltage transformer as claimed in claim 7 or 8, characterised in that the metal discs (9) have three through openings (12, 13, 14) which are mutually offset by 120"; that a clamping bolt (11) made of insulating material is passed through each of the aligned through openings (12, 13, 14) of the metal discs (9); and that the clamping bolts (11) hold the pressure plates (7, 8) together under pressure.
10. A voltage transformer as claimed in claim 9, characterised in that the clamping bolts (11) in the one pressure plate (7) are fixed by pins (16) which engage in transverse bores (17) in the clamping bolts (11).
11. A voltage transformer as claimed in claim 9 or claim 10, characterised in that the clamping bolts (11) in the other pressure plate (8) carry threaded bushes (18) on to which nuts (20) are screwed for clamping purposes.
12. A voltage transformer as claimed in one of claims 7 to 11, characterised in that the metal discs (9) are provided at their edge with a peripheral bead.
EP81730049A 1980-05-30 1981-05-14 Inductive-voltage transformer for a fully insulated, metal-enclosed high-voltage switchgear Expired EP0041917B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81730049T ATE12437T1 (en) 1980-05-30 1981-05-14 INDUCTIVE VOLTAGE TRANSFORMER FOR A FULLY INSULATED, METAL ENCLOSED HIGH VOLTAGE SWITCHGEAR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8014832U 1980-05-30
DE19808014832U DE8014832U1 (en) 1980-05-30 1980-05-30 INDUCTIVE VOLTAGE CONVERTER FOR A FULLY INSULATED, METAL-ENCLOSED HIGH-VOLTAGE SWITCHGEAR

Publications (4)

Publication Number Publication Date
EP0041917A2 EP0041917A2 (en) 1981-12-16
EP0041917A3 EP0041917A3 (en) 1982-01-20
EP0041917B1 true EP0041917B1 (en) 1985-03-27
EP0041917B2 EP0041917B2 (en) 1988-11-09

Family

ID=6715974

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81730049A Expired EP0041917B2 (en) 1980-05-30 1981-05-14 Inductive-voltage transformer for a fully insulated, metal-enclosed high-voltage switchgear

Country Status (4)

Country Link
EP (1) EP0041917B2 (en)
AT (1) ATE12437T1 (en)
DE (1) DE8014832U1 (en)
ZA (1) ZA813613B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4338537A1 (en) * 1993-11-11 1995-05-18 Sachsenwerk Ag Inductive electrical converter for medium voltage
CN104361985B (en) * 2014-10-31 2017-07-28 平高集团有限公司 A kind of voltage transformer and its pin configuration
CN112802657B (en) * 2021-01-11 2023-06-09 中气电力装备有限公司 Transformer assembly type supporting component for mountain environment

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT131016B (en) * 1930-07-04 1932-12-27 Siemens Ag Arrangement for measuring high voltages, especially in X-ray systems.
DE626600C (en) * 1933-03-04 1936-02-28 Guenther Kujath Dipl Ing Measuring device for high voltages
GB1204446A (en) * 1968-03-29 1970-09-09 Muirhead Ltd Formerly Known As Improvements relating to electrical components

Also Published As

Publication number Publication date
EP0041917A3 (en) 1982-01-20
DE8014832U1 (en) 1980-08-28
EP0041917A2 (en) 1981-12-16
ZA813613B (en) 1982-06-30
EP0041917B2 (en) 1988-11-09
ATE12437T1 (en) 1985-04-15

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