EP0603857B1 - Transformateur à tore magnétique avec protection de tension parasite - Google Patents

Transformateur à tore magnétique avec protection de tension parasite Download PDF

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Publication number
EP0603857B1
EP0603857B1 EP93120690A EP93120690A EP0603857B1 EP 0603857 B1 EP0603857 B1 EP 0603857B1 EP 93120690 A EP93120690 A EP 93120690A EP 93120690 A EP93120690 A EP 93120690A EP 0603857 B1 EP0603857 B1 EP 0603857B1
Authority
EP
European Patent Office
Prior art keywords
winding
magnetic core
current transformer
shielding
metallic
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 - Lifetime
Application number
EP93120690A
Other languages
German (de)
English (en)
Other versions
EP0603857A1 (fr
Inventor
Ingmar Dr. Grambow
Holger Dr.-Ing. Däumling
Hans Elsner
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.)
Ritz Messwandler GmbH and Co KG
Original Assignee
Ritz Messwandler GmbH and Co KG
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 Ritz Messwandler GmbH and Co KG filed Critical Ritz Messwandler GmbH and Co KG
Publication of EP0603857A1 publication Critical patent/EP0603857A1/fr
Application granted granted Critical
Publication of EP0603857B1 publication Critical patent/EP0603857B1/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
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • 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
    • H01F2038/305—Constructions with toroidal magnetic core

Definitions

  • the invention relates to a toroidal current transformer for installation in a metal encapsulation which is at ground potential and surrounds a high-voltage conductor and has at least one toroid which has a winding with leads passing through the metal encapsulation and a metallic shield surrounding the winding and which has an insulating gap to avoid a short-circuit winding .
  • Such a toroidal current transformer is known from DE-A-34 14 366.
  • the metallic shield consists of an electrically conductive material with an insulating gap.
  • transient overvoltages can occur within a switchgear in which such a toroidal current transformer is installed, for example when actuating disconnectors, which lead to disturbances in the form of traveling waves within the metal encapsulation.
  • Such transient overvoltages can generate high interference voltages in a current transformer, which can lead to considerable interference in the connected measuring electronics during operation of the current transformer.
  • the invention is therefore based on the object of a current transformer of the type mentioned train that the interference potential is further reduced by transient overvoltages.
  • the metallic shield is low-resistance and low-inductance and is formed as a conductive layer consisting of film or fabric, which is shaped as a winding of a meandering tape with changing winding direction, preferably after almost every complete turn.
  • the shielding and its low impedance and low inductance effectively prevent the formation of transient overvoltages, which are induced in the supply lines as a result of electrical converter waves. This also means that there are no overvoltages at the measuring connections, which can damage the connected instruments.
  • the protective circuits of the measuring instruments otherwise provided can advantageously be omitted.
  • Such a shielding film which can be formed either by a metallized plastic film or a metal film, for example, provides an ideal seal and metallic encapsulation of the windings against disturbing electromagnetic influences.
  • the foil must have an insulated gap in order to avoid a short circuit turn around the toroid in which high currents would flow.
  • the film can have a gap at which the winding of the current transformer is exposed.
  • the film may have an insulating layer above its electrically conductive layer.
  • a particularly good protection against overvoltages results from the fact that the layer of metallic shielding is designed as a meandering band winding with a changing winding direction. This results in a low inductance.
  • the supply lines have a metallic shielding cover, the first end of which is arranged directly on the metallic shielding and connected to it in a conductive manner, and that the metallic shielding cover is connected to the earth potential at its second end in the region of a measuring connection.
  • the first end of the metallic shielding sheath it is necessary for the first end of the metallic shielding sheath to be arranged directly on the shielding and to be conductively connected to it. In the area of the exit of the leads from the winding, there is no section in which electrical disturbances penetrate the leads. It is also important that the metallic shield cover is connected to the earth potential at its second end in the area of a measuring connection, so that a defined reference potential is available at this second end.
  • the metallic shield has an interference voltage potential with respect to the metal encapsulation due to the influence of the electrical interference. It is important that the differential voltage to be measured between the leads and the metallic shield is as great as the voltage between the leads and the metal encapsulation in the area of the measuring connection.
  • the electrical interference potentials on the metallic shield and the metallic shield cover equalized by currents flowing along the metallic shield and the metallic shield cover to the measuring connection and from there via the mass back to the metal enclosure of the switchgear. Such compensating currents have no influence on the voltages to be measured.
  • the invention can be advantageously designed in such a way that the supply lines have a shielding jacket which at least partially surrounds the metallic shielding cover, which is conductively connected to a grounded shielding electrode surrounding the current transformer and is likewise connected to the ground potential in the area of the measuring connection.
  • This additional shielding jacket is insulated from the shielding cover and has the effect that electrical disturbances only lead to interference potentials on the shielding cover and not to interference potentials on the metallic shielding cover, so that the equalizing currents flow through the shielding cover to compensate for the interference potential and not through the metallic shielding cover.
  • the film is designed as a tape winding with a winding layer on the toroidal core that is insulated from one another.
  • a metallized tape can be used as the film, which is provided on one side with an adhesive layer and on the other side with an insulating layer. The winding must not be closed to avoid a short circuit current around the toroid.
  • Such a tape winding can be easily applied in terms of production technology.
  • Interference voltages are also further reduced in that the metallic shield is applied in a partially overlapping manner and consists of a band whose surface conducts.
  • the measure that a semiconducting sheath is additionally provided also has a positive effect on the suppression of interference voltages.
  • the semiconducting layer can be provided both below and above the metallic shield.
  • windings are in contact with the flat semiconducting sheath in a conductive, preferably flat, manner.
  • a further reduction in the interference voltages is achieved if a shield made of metal tape which is insulated on all sides is additionally provided, at least in the area of the supply line.
  • a cylindrical toroidal current transformer 2 is arranged within a tubular part of a metal encapsulation 1. For the sake of clarity, only one toroidal core 3 is shown in FIG. 1.
  • the ring cores surround a conductor 4 carrying high voltage and are shielded from the electric field by a shield electrode 5, 28.
  • the shield electrode 5 has a gap 6, through which the shield electrode 5 with the metal encapsulation 1 is prevented from forming a short-circuit turn around the ring core 3, in which a ring current would be induced through the current flowing through the high-voltage conductor 4. However, electrical interferences still enter the area of the ring cores 3 through the gap 6.
  • Each toroidal core is surrounded by a secondary winding 7 symbolically represented in the figure, in which an electrical signal dependent on the current in the high-voltage conductor 4 is generated by induction. the electrical signal is fed through the leads 8, 9 to a measuring connection 10.
  • the ring cores are each surrounded by a shield 11 in the form of a shielding film, which is interrupted by a schematically illustrated gap 12 in order to avoid a short-circuit winding.
  • the feed lines 8, 9 have a metallic shield sleeve 13, which directly at its first end 14 is conductively connected to the film 11. At its second end 15, the shield cover 13 is grounded in the area of the measuring connection 10. It is taken into account that the connection of the shielding sleeve 13 or the shielding sleeve 16 to the earth potential of the measuring connection 10 is designed such that the leads 8, 9 are also shielded as well as possible in this area and that the earth connection of the shielding sleeve 13 or the shielding sleeve 16 is as short as possible.
  • a shielding jacket 16 surrounding the shielding sleeve 13 is provided, which surrounds the feed lines 8, 9 and the shielding sleeve 13 and is grounded in the area of the measuring connection 10. As a result, no compensating currents are induced in the shield cover 11. This results in a further reduction in the interference voltage potential.
  • the shield 11 is shown as a meandering winding from tape 17 over the lower left sector. This becomes visible when the outer tape insulation 25 and the covering protective winding 24 (FIG. 4) are removed in the sector mentioned.
  • the winding is clearer in Figure 3, which shows a view according to arrow III in the area of the feed line.
  • the shield 11 consists of a metallic tape 17, for example a metallic fabric tape, the surface of which is elastically conductive.
  • the winding is meandering.
  • band 17 is first laid with a certain pitch around the ring core with winding and protective fuse, which is of a customary construction, until it reaches a split band 18. It is passed under the insulating split tape and then on edge 19 of the split tape 18 deflected in the opposite direction and again guided around the ring core until it reaches the slit band 18 again. The next partial turn then follows in the opposite direction as described above.
  • the individual turns 20, 21 thus each have an opposite winding direction and do not touch at the deflection points. In this way, short-circuit turns are avoided.
  • the end of the tape is conductively connected to the shield sleeve 13 of the leads.
  • the shield cover 13 ideally consists of the individual shield covers 22, 23, which surround each supply line separately.
  • a further lowering of the interference voltage potential results if, at least in the area of the feed lines 8, 9, the shield 11 is additionally provided with a protective winding 24, which is made, for example, from mutually insulated winding layers of a metallized strip.
  • This tape can, for example, be provided on one side with an adhesive layer and on the other side with an insulating layer. The windings must not be closed to avoid a short-circuit current around the toroid.
  • an insulating layer can then be applied on the outside in a generally known manner.
  • this additional protective winding 24 is shown from a metal tape insulated at least on one side.
  • Each feed line 8, 9 initially has its own individual shield cover 22, 23, which in turn is surrounded by the shield cover 13.
  • the secondary winding of the toroidal core 3 is first provided with protective insulation (not shown), on which an additional semiconducting layer may also be applied.
  • This semiconducting layer then forms the base 27 (FIGS. 4 and 1) for the metallic shield 11, the individual turns of which are applied to the surface of the semiconducting layer and touch it in a conductive manner.

Landscapes

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

Claims (8)

  1. Transformateur d'intensité à noyau annulaire (2), destiné à être monté dans une capsule métallique mise à la masse, entourant un conducteur de haute tension, ayant :
    - au moins un noyau annulaire (3) muni des lignes d'alimentation traversant la capsule métallique et un blindage métallique entourant l'enroulement ayant un intervalle d'isolation (6) pour éviter de court-circuiter l'enroulement,
    caractérisé en ce que
    le blindage métallique (11) est une couche formée d'une feuille ou d'un tissu conducteur, faiblement ohmique et faiblement inductif, cette couche étant un ruban (17) enroulé en méandres, dont le sens de l'enroulement change de préférence pratiquement après chaque tour complet (20, 21).
  2. Transformateur d'intensité à noyau annulaire (2), destiné à être monté dans une capsule métallique mise à la masse et entourant un conducteur de haute tension, ayant :
    - au moins un noyau annulaire (3) muni de lignes d'alimentation pour l'enroulement, traversant la capsule métallique et un blindage métallique entourant l'enroulement, selon la revendication 1,
    caractérisé en ce que
    les lignes d'alimentation (8, 9) ont une enveloppe métallique (13) formant blindage, dont la première extrémité est directement sur le blindage métallique auquel elle est reliée et la seconde extrémité de la gaine métallique formant blindage est reliée à la masse au niveau d'un branchement de mesure (10).
  3. Transformateur d'intensité à noyau annulaire selon au moins l'une des revendications précédentes,
    caractérisé en ce que
    les lignes d'alimentation comportent une gaine formant blindage (16) entourant au moins en partie l'enveloppe métallique formant blindage (13), cette gaine étant reliée électriquement à une électrode formant blindage (28), mise à la masse, entourant le transformateur d'intensité (2), et qui est également reliée à la masse au niveau du branchement de mesure (10).
  4. Transformateur d'intensité à noyau annulaire selon l'une des revendications 1, 2 ou 3,
    caractérisé en ce que
    la feuille est un enroulement en ruban (24) avec des couches d'enroulement isolées l'une par rapport à l'autre sur le noyau annulaire.
  5. Transformateur d'intensité à noyau annulaire selon l'une des revendications 1, 2, 3 ou 4,
    caractérisé en ce que
    le blindage métallique (11) est enroulé avec chevauchement partiel et se compose d'une bande (17) dont la surface est conductrice.
  6. Transformateur d'intensité à noyau annulaire selon l'une des revendications 1, 2, 3, 4 ou 5,
    caractérisé par
    une enveloppe semi-conductrice (27), complémentaire.
  7. Transformateur d'intensité à noyau annulaire selon l'une des revendications 1, 2, 3, 4, 5 ou 6,
    caractérisé en ce que
    les spires (20, 21) sont mises en contact avec l'enveloppe (27) semi-conductrice, en surface, par un contact de préférence de surface.
  8. Transformateur d'intensité à noyau annulaire selon l'une des revendications 1, 2, 3, 4, 5, 6 ou 7,
    caractérisé par
    au moins un blindage (24), formé d'un ruban métallique isolé de tous côtés, est prévu au moins au niveau de la conduite d'alimentation.
EP93120690A 1992-12-24 1993-12-22 Transformateur à tore magnétique avec protection de tension parasite Expired - Lifetime EP0603857B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9217807U DE9217807U1 (fr) 1992-12-24 1992-12-24
DE9217807U 1992-12-24

Publications (2)

Publication Number Publication Date
EP0603857A1 EP0603857A1 (fr) 1994-06-29
EP0603857B1 true EP0603857B1 (fr) 1997-09-10

Family

ID=6887663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93120690A Expired - Lifetime EP0603857B1 (fr) 1992-12-24 1993-12-22 Transformateur à tore magnétique avec protection de tension parasite

Country Status (3)

Country Link
EP (1) EP0603857B1 (fr)
AT (1) ATE158103T1 (fr)
DE (2) DE9217807U1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4344183A1 (de) * 1993-12-23 1995-06-29 Ant Nachrichtentech Hochspannungstransformator sowie Verwendung
DE59712933D1 (de) * 1996-08-23 2008-05-15 Abb Schweiz Ag Messvorrichtung für eine metallgekapselte, gasisolierte Hochspannungsanlage
EP0825448A3 (fr) * 1996-08-23 1999-12-29 Asea Brown Boveri AG Appareil mesure pour une installation blindée à haute tension à isolation de gaz
DE102005007334B4 (de) * 2005-02-17 2007-02-08 Siemens Ag Summenstromwandler zur allstromsensitiven Erfassung eines elektrischen Differenzstromes
EP1693943A3 (fr) * 2005-02-17 2015-10-28 Siemens Aktiengesellschaft Dispositif pour la détection des courants différentiels continus ou alternatifs
CN114050041A (zh) * 2021-11-17 2022-02-15 许昌许继软件技术有限公司 一种集成低功耗电流互感器线圈的高压套管

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH660262A5 (de) * 1982-12-10 1987-03-31 Bbc Brown Boveri & Cie Stromwandler.
CH662215A5 (de) * 1983-09-08 1987-09-15 Sprecher Energie Ag Metallgekapselte, gasisolierte schaltanlage.
FR2564594B1 (fr) * 1984-05-21 1986-09-12 Merlin Gerin Capteur de courant a noyau amagnetique
DE4106034A1 (de) * 1991-02-22 1992-08-27 Siemens Ag Stromwandler

Also Published As

Publication number Publication date
ATE158103T1 (de) 1997-09-15
EP0603857A1 (fr) 1994-06-29
DE9217807U1 (fr) 1993-04-08
DE59307337D1 (de) 1997-10-16

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