EP0653767A1 - Transformateur électrique à moyenne tension - Google Patents

Transformateur électrique à moyenne tension Download PDF

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Publication number
EP0653767A1
EP0653767A1 EP94115707A EP94115707A EP0653767A1 EP 0653767 A1 EP0653767 A1 EP 0653767A1 EP 94115707 A EP94115707 A EP 94115707A EP 94115707 A EP94115707 A EP 94115707A EP 0653767 A1 EP0653767 A1 EP 0653767A1
Authority
EP
European Patent Office
Prior art keywords
magnetic core
winding
transducer according
electrical
following
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.)
Granted
Application number
EP94115707A
Other languages
German (de)
English (en)
Other versions
EP0653767B1 (fr
Inventor
Karl Dipl.-Ing. Stegmüller
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.)
Schneider Electric Sachsenwerk GmbH
Original Assignee
Sachsenwerk AG
AEG Sachsenwerk GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sachsenwerk AG, AEG Sachsenwerk GmbH filed Critical Sachsenwerk AG
Publication of EP0653767A1 publication Critical patent/EP0653767A1/fr
Application granted granted Critical
Publication of EP0653767B1 publication Critical patent/EP0653767B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • 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 relates to an inductive electrical converter according to the preamble of the first claim.
  • the invention has for its object to take measures in a converter according to the preamble of the first claim, through which cavities enclosed with a simple structure can be easily mastered in terms of insulation technology.
  • a simple, prefabricated casing in which the magnetic core with the associated windings is fixed without the aid of electrically insulating casting resins or the like, including any cavities.
  • the insulating gas filling made of SF6 or similar insulating gases, which is preferably introduced into the casing under excess pressure, brings about the reliable electrical insulation in the area of the design-related cavities.
  • All that is required for the sheathing is a simple tubular body made of electrical insulating material, the end faces of which are to be closed with a tightly attached flange each time the magnetic core with the windings is inserted into the tubular body.
  • the flanges can be connected in a simple manner by gluing their edge region to the tubular body, pressure bonding preferably being carried out.
  • the primary winding in particular, is constructed from a plurality of independent and electrically series-connected disc coils, the free winding end of the one axially terminal disc coil being connected to high-voltage potential and the free winding connection of the last disc coil axially distant therefrom being connected to ground potential.
  • the secondary winding is then also arranged adjacent to this last disk coil, so that there is only a negligible electrical voltage potential between these two coils, which is easy to master in terms of insulation technology.
  • the magnetic core in several parts in order to match the necessary one to be able to adjust the axial length of the primary winding including the secondary winding.
  • the magnetic core consists of a magnetic material which has a very low electrical conductivity, that is to say acts as an electrical insulator.
  • the magnetic core does not form an electrical short circuit for the electrical field between the high-voltage connection and the ground connection, so that, in particular when the magnetic core is connected to ground potential, the same does not transmit the ground potential over the entire axial length of the primary winding in the region of the connection on the high-voltage side.
  • the magnetic core forms an electrical insulation, so that the voltage drop that occurs over the length of the primary winding is also formed on the insulating magnetic core by, in particular, capacitive coupling.
  • the voltage difference between the individual sections of the primary winding and the magnetic core is thus small, so that correspondingly small insulation distances are sufficient for safe operation.
  • the SF6 insulation in conjunction with the electrically insulating magnetic core and the primary coil which is designed in the manner of a chamber coil that reduces the voltage drop in stages, enable the construction of a voltage converter for medium voltage in a very small design.
  • An inductive electrical voltage converter for medium-voltage networks has a soft magnetic core 1, which has a low magnetic remanence has and is assigned a primary winding made up of a plurality of axially lined-up disc coils 2 and a further disc winding arranged in the axial extension and used as a secondary winding 3.
  • This arrangement is located within an envelope made of an electrically insulating tubular body 4, the end faces of which are each closed by a tightly attached flange 5.
  • the sheath 4.5 surrounds the magnetic core 1 with the windings 2, 3 gas-tight, the design-related cavities in the area of the magnetic core with its windings 2, 3 and the inner jacket of the sheath 4, 5 being filled with an insulating gas which has a higher insulation value than Has air and is especially sulfur hexafluoride, i.e. SF6 or a similar insulating gas.
  • an insulating gas which has a higher insulation value than Has air and is especially sulfur hexafluoride, i.e. SF6 or a similar insulating gas.
  • the pressure of the insulating gas filling can be chosen higher than the external atmospheric pressure.
  • the sheathing can be represented in a simple manner after only one insulating tube section is to be closed at both ends with the flanges, which consist in particular of metal, it being possible for the connection between the edge of the flanges and the relevant section of the tube body to be made by gluing by means of an interposed adhesive 6.
  • the bond is in particular formed as a pressure bond, so that the gas-tight enclosure of the magnetic core 1 and windings 2, 3 is ensured over a long period of time.
  • the magnetic core 1 consists in particular of an electrically insulating magnetic material, preferably based on ferrites, which, with good magnetic properties, have a very low electrical conductivity, ie form electrical insulators. This avoids that the same potential, in particular earth or ground potential, is not brought to every point of the assigned windings 2, 3 in relation to a metallic magnetic core.
  • the design of the primary coil as a chamber coil or as an axial sequence of individual disk coils has an advantageous effect because the voltage drop over the axial length from disk coil to disk coil is then gradually reduced to the ground potential to which the last disk coil is connected. This results in a large electrically effective path between the winding connections of the primary coil, which is not shortened here by the combination with the magnetic core acting as an electrical insulator.
  • the secondary winding 3 is arranged in the axial direction of the terminal disk coil 2.5 adjacent to the primary winding 2, the free winding connection 7 of which is to be connected to ground potential.
  • the electrical voltage gradient between the disk coil 2.5 and the secondary winding 3 is so small that the insulation of the coil formers is sufficient, on which the individual disk coils 2.1 to 2.5 or the secondary winding 3 are wound.
  • the independent disc coils 2.1 to 2.5 make it possible to vary the voltage range to be detected accordingly. It is therefore easily possible to adapt the converter structure for the voltage series for 12 kV, 24 kV or 36 kV in a simple manner.
  • the axial end faces of the disk coils 2.1 to 2.5 can be provided with coordinated contact contact surfaces 8, which come into mutual contact when the coil disks are strung together and thus accomplish the series connection automatically without special aids.
  • the magnetic core 1 is also constructed from a plurality of core parts 1.1 or 1.2 which can be joined together in the axial direction and which are to be inserted between terminal core parts 1.3 as required.
  • the Magnetic core at least two in cross-section E-shaped end core parts 1.3, which face each other with their open sides and between which the windings 2,3 are located. In the shortest embodiment, the two end core parts are sufficient. If the detectable voltage range of the converter is to be increased, one or more additional disk coils must be used. In order to close the gap between the end core parts 1.3, one or more of the intermediate core parts 1.1 or 1.2 are interposed. The intermediate core parts 1.2 are inserted into the center of the disc coils, while the outer intermediate core parts 1.1 are arranged in the region of the outer circumference of the disc coils. The intermediate core parts 1.1 can be designed as rings encompassing the disc coils. Depending on the voltage range to be detected, several of the intermediate core parts 1.1 or 1.2 can also be placed between the terminating core parts 1.3.
  • the winding connection 8.1 to be connected to the high-voltage source on that of the disk winding 2.1 which is the most distant from the primary winding can be directly connected in an electrically conductive manner to the adjacent flange 5 because the magnetic core is designed to be electrically insulating.
  • a mechanical compression spring 9 can be used between this flange 5 and the adjacent end core part 1.3, which axially compresses the multi-part magnetic core 1 and thereby reduces the gaps in the magnetic circuit which adversely affect the magnetic flux to a minimum.
  • the winding connection 7 to be connected to ground potential, as well as the winding connections 10, 11 of the secondary coil 3, are guided to separate connection elements in a connection box 12 which is provided on the flange arranged adjacent to the secondary coil 3.
  • This flange 5 can also be at ground potential be turned on.
  • insulator rings 13 pointing radially outward to the outer circumferential surface of the tubular body 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
EP94115707A 1993-11-11 1994-10-06 Transformateur électrique à moyenne tension Expired - Lifetime EP0653767B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4338537A DE4338537A1 (de) 1993-11-11 1993-11-11 Induktiver elektrischer Wandler für Mittelspannung
DE4338537 1993-11-11

Publications (2)

Publication Number Publication Date
EP0653767A1 true EP0653767A1 (fr) 1995-05-17
EP0653767B1 EP0653767B1 (fr) 1998-01-07

Family

ID=6502367

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94115707A Expired - Lifetime EP0653767B1 (fr) 1993-11-11 1994-10-06 Transformateur électrique à moyenne tension

Country Status (2)

Country Link
EP (1) EP0653767B1 (fr)
DE (2) DE4338537A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0755061A1 (fr) * 1995-07-15 1997-01-22 Kommanditgesellschaft Ritz Messwandler GmbH & Co. Transformateur de tension unipolaire
CN108183014A (zh) * 2017-12-04 2018-06-19 国网河南省电力公司滑县供电公司 一种电压互感器
CN108305768A (zh) * 2018-03-14 2018-07-20 珠海市新化磁性材料有限公司 一种高压绝缘变压器及其制作方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19653827C1 (de) * 1996-12-21 1998-06-18 Vem Elektroantriebe Gmbh Einrichtung zur Vorspülung und Erzeugung von Überdruck im Bereich des Wickelkopfes einer drehenden elektrischen Hochspannungsmaschine
EP3239997A1 (fr) 2016-04-25 2017-11-01 ABB Schweiz AG Appareil ht et procédé de fabrication d'un tel appareil

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH240528A (de) * 1944-01-05 1945-12-31 Isaak Dr Goldstein Transformator, insbesondere Spannungswandler, mit offenem Eisenkern.
DE942823C (de) * 1954-04-16 1956-05-09 Koch & Sterzel Ag Hochspannungsseitig mit Anzapfungen versehener Hochspannungstransformator
DE2108153A1 (de) * 1971-02-20 1972-08-31 Messwandler Bau Gmbh Hochspannungsprüftransformator großer Leistung
FR2179250A1 (fr) * 1972-04-07 1973-11-16 Stroemberg Oy Ab
FR2179805A1 (fr) * 1972-04-04 1973-11-23 Osoboe K Bjuro Ins
JPS5297121A (en) * 1976-02-12 1977-08-15 Toshiba Corp Method of uniting tank and cover of electric apparatus
DE2843608A1 (de) 1978-10-06 1980-04-10 Raupach Friedrich Transformator, insbesondere spannungswandler oder prueftransformator
DE3803846A1 (de) 1988-02-09 1989-08-17 Bernd Dipl Ing Sommer Hochspannungs-prueftransformator mit isolierten kernsegmenten

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE602855C (de) * 1930-12-05 1934-09-18 Koch & Sterzel Akt Ges Spannungswandler mit einem Durchfuehrungsisolator
DE8014832U1 (de) * 1980-05-30 1980-08-28 Siemens Ag, 1000 Berlin Und 8000 Muenchen Induktiver spannungswandler fuer eine vollisolierte, metallgekapselte hochspannungsschaltanlage

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH240528A (de) * 1944-01-05 1945-12-31 Isaak Dr Goldstein Transformator, insbesondere Spannungswandler, mit offenem Eisenkern.
DE942823C (de) * 1954-04-16 1956-05-09 Koch & Sterzel Ag Hochspannungsseitig mit Anzapfungen versehener Hochspannungstransformator
DE2108153A1 (de) * 1971-02-20 1972-08-31 Messwandler Bau Gmbh Hochspannungsprüftransformator großer Leistung
FR2179805A1 (fr) * 1972-04-04 1973-11-23 Osoboe K Bjuro Ins
FR2179250A1 (fr) * 1972-04-07 1973-11-16 Stroemberg Oy Ab
JPS5297121A (en) * 1976-02-12 1977-08-15 Toshiba Corp Method of uniting tank and cover of electric apparatus
DE2843608A1 (de) 1978-10-06 1980-04-10 Raupach Friedrich Transformator, insbesondere spannungswandler oder prueftransformator
DE3803846A1 (de) 1988-02-09 1989-08-17 Bernd Dipl Ing Sommer Hochspannungs-prueftransformator mit isolierten kernsegmenten

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1, no. 155 (E - 77) 12 December 1977 (1977-12-12) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0755061A1 (fr) * 1995-07-15 1997-01-22 Kommanditgesellschaft Ritz Messwandler GmbH & Co. Transformateur de tension unipolaire
CN108183014A (zh) * 2017-12-04 2018-06-19 国网河南省电力公司滑县供电公司 一种电压互感器
CN108305768A (zh) * 2018-03-14 2018-07-20 珠海市新化磁性材料有限公司 一种高压绝缘变压器及其制作方法

Also Published As

Publication number Publication date
DE59404942D1 (de) 1998-02-12
EP0653767B1 (fr) 1998-01-07
DE4338537A1 (de) 1995-05-18

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