WO1995024723A1 - Transformateur de courant - Google Patents

Transformateur de courant Download PDF

Info

Publication number
WO1995024723A1
WO1995024723A1 PCT/EP1994/001672 EP9401672W WO9524723A1 WO 1995024723 A1 WO1995024723 A1 WO 1995024723A1 EP 9401672 W EP9401672 W EP 9401672W WO 9524723 A1 WO9524723 A1 WO 9524723A1
Authority
WO
WIPO (PCT)
Prior art keywords
current transformer
current
voltage
transformer according
connections
Prior art date
Application number
PCT/EP1994/001672
Other languages
German (de)
English (en)
Inventor
Elfriede Hommelsheim
Olaf Brockmann
Original Assignee
Kommanditgesellschaft Ritz Messwandler Gmbh & Co.
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 Kommanditgesellschaft Ritz Messwandler Gmbh & Co. filed Critical Kommanditgesellschaft Ritz Messwandler Gmbh & Co.
Publication of WO1995024723A1 publication Critical patent/WO1995024723A1/fr

Links

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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers

Definitions

  • the invention relates to a current transformer, in particular for medium-voltage switchgear, preferably in the form of a cuboid with a top, a back, a front and side sides, in a resin-molded design and with connections for connection into the current flow of a live current conductor.
  • Such current transformers are used in medium-voltage switchgear. They provide a signal that is proportional to the measured currents and that can be further processed with standard low-voltage electrodes.
  • the voltages must also be measured.
  • Known voltage converters are used for this.
  • a disadvantage of the known combi transducers is that the weight can no longer be handled manually by an individual person and the assembly effort is thereby increased.
  • Voltage transformers must be dismantled. With these tests there is a risk that the voltage transformers will saturate and be thermally damaged. To avoid this, voltage transformers are usually removed from the system beforehand. This is not always the case with combination converters possible, so that damage to the voltage transformer cannot be excluded with this type.
  • the object of the invention is to provide a current transformer which can be used in particular for use on fixed conductors or rails and is nevertheless easy to handle.
  • the current transformer has an additional contact piece on the outside, which is connected to a connection in a voltage-transmitting manner.
  • a correspondingly adapted counterpart with the voltage converter can be placed on the voltage-transmitting contact piece.
  • the current transformer can be installed particularly easily.
  • the current transformer is e.g. with a
  • outer cone connector system which is known and standardized as such.
  • the inner cone is then arranged on the insulated rail.
  • Voltage converter part advantageously remain free of undesired mechanical constraints if the voltage converter part and the current converter have complementary positioning pairs on the mutually facing sides.
  • the positioning pairs can be designed, for example, on one side as an outer cone surface and on the other side as an inner cone surface. Such a part is sufficient for positioning if another pairing has the angular position and the third
  • Pairing for example, also defines the distance.
  • the current transformer can be installed particularly easily in the switchgear.
  • the terminal box can be locked with the cables using a quick-release fastener.
  • the current transformer can be combined particularly well with a voltage transformer if the additional contact piece is arranged on a side other than the connections.
  • a design in which the contact piece is arranged on the upper side has proven to be particularly advantageous. As a result, the voltage transformer can be connected to it even when the current transformer is installed, without other parts having to be dismantled.
  • the entire assembly is particularly space-saving and compact if the voltage transformer part is assigned to the current transformer part and has a counterpart matched to the contact piece of the current transformer part.
  • the voltage transformer is then mounted directly on the current transformer, the conductive connection being established by the contact piece and the correspondingly adapted counterpart. Mechanically they are so tight that they also serve as a holder for the voltage converter.
  • Switchgear with several current transformers in combination with voltage transformers can be built particularly compact because the current transformers can be installed close to each other.
  • the voltage transformer part assigned to the current transformer part has the same or smaller shape in a horizontal projection.
  • the assembly of the transducers in the housing of the switching station is simplified if the rear sides of the current and voltage transducer part are aligned and fastening lugs are preferably arranged on them.
  • the parts can then be mounted on a wall within the system using screws.
  • the new form of the current transformer has proven particularly useful in cases in which the current transformer is designed to be pluggable onto current conductors which are fixed, in particular insulated rails.
  • FIG. 1 is a side view of the current transformer according to the invention with a mounted voltage transformer
  • FIG. 2 shows the front of the current transformer according to arrow II in FIG. 1
  • Fig. 3 shows a detail of the side view of Figure 1
  • Fig. 4 is a circuit diagram of a combined current and voltage converter.
  • Fig. 1 denotes the current transformer part and 2 the voltage transformer part.
  • the current-carrying and insulated conductors are located in the switchgear and are therefore not shown in the illustration. Contact pieces with an inner cone are attached to these conductors.
  • connection 12 with an outer cone 13 and is plugged onto the inner cone of the contact piece.
  • busbars enclosed in the current transformer there is a conductive connection between the connections 12 and a primary side of a measuring coil enclosed in the housing 6.
  • a contact piece 17 is connected to the current-carrying conductors, not shown, via a further conductor enclosed in the housing 6, for example as an outer cone in accordance with DIN 47 636.
  • the voltage converter part 2 is, on the one hand, by a counterpart 22 which is adapted to the outer cone of the contact piece 17; which is shaped, for example, according to DIN 47 637, conductively fastened on the current transformer part 1.
  • Voltage converter part 2 connected to current transformer part 1 by positioning pairs 24.
  • terminal boxes 25 with cable holding part 26 are arranged on the housing 23 of the voltage converter 2 and on the housing 6 of the current transformer part 1.
  • the interior and the known parts of the current transformer housing 6 and the voltage transformer housing 23 arranged therein are completely cast with resin.
  • the housings are made of metal for shielding. Instead, they can only be metallized.
  • the voltage transformer part 2 can be separated from the current transformer part 1 by lifting it.
  • the counterpart 22 is withdrawn from the outer cone of the contact piece 17 and thus the conductive connection between the two parts of the contact pair is separated.
  • the voltage transformer can be easily separated from the current transformer part for overvoltage tests. For installation, current transformer part 1 and voltage transformer part 2 are to be handled separately, so that the installation is considerably easier.
  • FIG. 4 the positioning pairs 24 are shown as a detail in side view.
  • a centering tip 19 sinks into the upper opening of a tube 20 when the voltage transformer is placed on the current transformer.
  • the height of the tube 20 is adjustable and may be readjusted during initial assembly. In this way, the nested centering tip and the opening of the tube 20 position both the horizontal and the vertical position of the voltage converter.
  • FIG. 4 shows the circuit diagram of a combined current and voltage converter encapsulated on all sides by metal.
  • the current conductors are connected to the connections K and L / U corresponding to connections 12 of the primary-side coil 15 of the current transformer part 1.
  • One side of the secondary-side measuring coil 4 is connected to the metal encapsulation and ground potential at terminal k.
  • the measurement signal is present at the other contact 1.
  • the voltage conversion part 2 with primary part 27 is conductively connected to one of the connections 12 by contact piece 17 and counterpart 22.
  • the other side of the primary part 27 is connected to earth potential at terminal X.
  • the secondary part 28 is also connected on one side to the earth potential at terminal X, while the measurement signal is present at the other terminals u.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Amplifiers (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

Un transformateur de courant, notamment pour installations de distribution électrique pour moyenne tension, de préférence de forme carrée, avec une face supérieure, une face postérieure, une face antérieure et des faces latérales, est coulé en résine et pourvu de connexions au flux de courant d'un conducteur de courant sous tension. Le transformateur de courant comprend une pièce supplémentaire extérieure de contact relié à une connexion de manière à transmettre la tension.
PCT/EP1994/001672 1994-03-10 1994-05-25 Transformateur de courant WO1995024723A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEG9404007.9U 1994-03-10
DE9404007U DE9404007U1 (de) 1994-03-10 1994-03-10 Stromwandler

Publications (1)

Publication Number Publication Date
WO1995024723A1 true WO1995024723A1 (fr) 1995-09-14

Family

ID=6905734

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1994/001672 WO1995024723A1 (fr) 1994-03-10 1994-05-25 Transformateur de courant

Country Status (2)

Country Link
DE (1) DE9404007U1 (fr)
WO (1) WO1995024723A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109473268A (zh) * 2018-11-28 2019-03-15 重庆华虹仪表有限公司 一种电流电压组合式互感器及其制造方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29501082U1 (de) * 1995-01-13 1995-03-23 Siemens AG, 80333 München Anordnung zur Spannungsmessung an feststoffisolierter Sammelschiene von Mittelspannungs-Schaltanlagen
DE102007033705B4 (de) * 2007-07-17 2009-03-05 Siemens Ag Wandleranordnung einer metallgekapselten, gasisolierten Schaltanlage sowie metallgekapselte, gasisolierte Schaltanlage

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1061892B (de) * 1953-09-24 1959-07-23 Raupach Friedrich Kombinierter Hochspannungs-Messwandler in Stuetzerbauart mit Giessharzisolation
DE1281022B (de) * 1964-12-24 1968-10-24 Licentia Gmbh Kombinierter Messwandler
JPS55125616A (en) * 1979-03-22 1980-09-27 Mitsubishi Electric Corp Voltage and current transformer for gas-insulation meter
JPS56138907A (en) * 1980-04-01 1981-10-29 Toshiba Corp Combined voltage current transformer for instrument
EP0049641A1 (fr) * 1980-10-07 1982-04-14 Mitsubishi Denki Kabushiki Kaisha Appareil électrique isolé au gaz
JPH01133312A (ja) * 1987-11-18 1989-05-25 Mitsubishi Electric Corp 計器用変圧変流器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1061892B (de) * 1953-09-24 1959-07-23 Raupach Friedrich Kombinierter Hochspannungs-Messwandler in Stuetzerbauart mit Giessharzisolation
DE1281022B (de) * 1964-12-24 1968-10-24 Licentia Gmbh Kombinierter Messwandler
JPS55125616A (en) * 1979-03-22 1980-09-27 Mitsubishi Electric Corp Voltage and current transformer for gas-insulation meter
JPS56138907A (en) * 1980-04-01 1981-10-29 Toshiba Corp Combined voltage current transformer for instrument
EP0049641A1 (fr) * 1980-10-07 1982-04-14 Mitsubishi Denki Kabushiki Kaisha Appareil électrique isolé au gaz
JPH01133312A (ja) * 1987-11-18 1989-05-25 Mitsubishi Electric Corp 計器用変圧変流器

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 13, no. 383 (E - 811)<3731> 24 August 1989 (1989-08-24) *
PATENT ABSTRACTS OF JAPAN vol. 4, no. 181 (E - 37)<663> 13 December 1980 (1980-12-13) *
PATENT ABSTRACTS OF JAPAN vol. 6, no. 16 (E - 92)<894> 29 January 1982 (1982-01-29) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109473268A (zh) * 2018-11-28 2019-03-15 重庆华虹仪表有限公司 一种电流电压组合式互感器及其制造方法

Also Published As

Publication number Publication date
DE9404007U1 (de) 1994-05-05

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