EP0343099B1 - Transformateur d'intensité enroulé - Google Patents

Transformateur d'intensité enroulé Download PDF

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Publication number
EP0343099B1
EP0343099B1 EP89730117A EP89730117A EP0343099B1 EP 0343099 B1 EP0343099 B1 EP 0343099B1 EP 89730117 A EP89730117 A EP 89730117A EP 89730117 A EP89730117 A EP 89730117A EP 0343099 B1 EP0343099 B1 EP 0343099B1
Authority
EP
European Patent Office
Prior art keywords
capacitor
current transformer
conductive
iron core
ring
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
EP89730117A
Other languages
German (de)
English (en)
Other versions
EP0343099A1 (fr
Inventor
Johannes Dipl.-Ing. Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to AT89730117T priority Critical patent/ATE85152T1/de
Publication of EP0343099A1 publication Critical patent/EP0343099A1/fr
Application granted granted Critical
Publication of EP0343099B1 publication Critical patent/EP0343099B1/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
    • 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 winding current transformer with at least one ring-shaped iron core carrying a secondary winding, with a primary winding with a plurality of turns passing through the window of the iron core with a conductive sheathing and with a ring capacitor lying in the window of the iron core against the secondary winding and having a continuous longitudinal slot, the two receptacles forming the electrodes of the ring capacitor and located on different sides of the ring capacitor are provided with electrical connection lines for secondary connection terminals.
  • a winding current transformer of this type is known from German utility model 84 26 556.
  • the ratio of the high-voltage capacitor to the low-voltage capacitor in the case of an unchangeable high-voltage capacitor is determined by the capacitance of the ring capacitor. If the divider ratio is to be changed, this is possible in the known winding current transformer in that an external capacitor is connected to the secondary connection terminals, as a result of which the capacitance of the undervoltage capacitor is increased as a result of parallel connection and the divider ratio is thereby changed.
  • Such an adjustment of the division ratio to the respective needs is, however, quite complex.
  • conductive, cylindrical inserts between the coverings, which extend coaxially aligned at least over part of the length of the ring capacitor and are connected to the connection terminals.
  • the main advantage of the winding current transformer according to the invention is that additional capacities are formed by the conductive inserts within the area between the linings, which due to the connection of these conductive inserts with the connecting terminals represent parallel capacities to the capacitance formed by the linings of the ring capacitor.
  • the division ratio of the upper to lower voltage capacitor can be adjusted according to the respective requirements without the need for an additional external capacitor.
  • the coordination of the total capacitance of the undervoltage capacitor is possible in a simple manner in that the cylindrical inserts extend over such a part of the total length or over the total length of the ring capacitor that partial capacitances are formed which in total correspond to the required value of the capacitance of the undervoltage capacitor, whereby the required division ratio is achieved.
  • the insert adjacent to the inner covering with the electrical connection line of the outer covering and the insert adjacent to the outer covering with the electrical connection line of the insert are advantageously in the case of the winding current transformer according to the invention inner lining connected. If more than two inserts are provided in the winding current transformer according to the invention, then further inserts are to be connected to the connecting lines in accordance with the specified scheme.
  • the winding current transformer shown in FIG. 1 has a block-shaped cast resin body 1, in which, among other things, an annular iron core 2 with an applied secondary winding 3 lies.
  • the window 4 of the iron core 2 is penetrated by several turns of a primary winding 5, which is brought up to the outer connecting bolts 6 and 7.
  • Each turn of the primary winding 5 carries a layer of conductive or semiconducting material on an insulation, as described in detail in German Utility Model 78 12 060.
  • the individual turns of the primary windings 5 are held together by means of a tensioning band 8, as a result of which the layers of conductive or semiconducting material of the individual turns come into contact with one another and additionally all layers have one and the same potential due to the metal tensioning band, so that the primary winding 5 has an outward direction has acting conductive sheath.
  • a secondary terminal box 9 is held laterally, in which secondary terminals, not shown in detail, are accommodated.
  • a ring capacitor 10 which contains an insulating body 11.
  • the insulating body 11 or the entire ring capacitor 10 has a continuous longitudinal slot 12.
  • a conductive covering 14 which ends at a distance both from the longitudinal slot 12 and from the front edges of the insulating body 1.
  • a conductive coating is applied to the outer side of the insulating body 11, which is not visible here, so that the two coatings together with the insulating body 11 form a ring capacitor 10.
  • the insulating body 11 which preferably consists of a winding of insulating material, there are cylindrical, conductive inserts 15 and 16, which are only indicated by dashed lines in FIG. 1 because, like the inner covering 14, they are not guided to the outer edge of the insulating body.
  • These deposits 15 and 16 form additional capacitances with the coatings of the ring capacitor 10, as will be explained in more detail with reference to FIG. 2.
  • Both the conductive coating 14 on the inside of the ring capacitor 10 and the outer coating (not visible in FIG. 1) as well as the inserts 15 and 16 are connected in a manner shown in FIG. 2 to electrical connecting lines 17 and 18 which are in the secondary terminal box 9 are performed.
  • the voltage at the ring capacitor 10 forming the undervoltage capacitor of a capacitive divider can thus be tapped on the outside.
  • the high-voltage capacitor of the capacitive voltage divider is formed by the conductive covering 14 and the conductive sheathing of the primary winding 5.
  • FIG. 2 only the straight area passing through the core window 3 of the primary winding 5 is shown schematically; this area of the primary winding 5 is surrounded by the ring capacitor 10, so that a capacitance C1 is formed between the conductive sheath of the primary winding 5 and the inner coating 14 of the ring capacitor 10, which capacitance forms the capacitance of the high-voltage capacitor of a capacitive divider.
  • the conductive inserts 15 and 16 are accommodated, which form capacitances C14, C15 and C16 with the inner layer 14 and the outer layer 19 of the ring capacitor.
  • a further capacitance C2 is formed between the inner covering 14 and the outer covering 19 in the area on the right in FIG. 2.
  • the conductive insert 15 of the ring capacitor 10 adjacent to the inner covering 14 is connected at point 20 to the electrical connecting line 18 of the outer covering 19, while the conductive insert 16 adjacent to the outer covering 19 is connected at 21 to the electrical connecting line 17 of the inner covering 14 in Is connected.
  • a total capacitance of the ring capacitor 10 then arises between the two points 20 and 21, which results from the sum of the capacitances C14, C15, C16 and C2.
  • By appropriate length dimensioning of the conductive Deposits 15 and 16 can set the value of the total capacitance of the undervoltage capacitor or ring capacitor 10.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Details Of Television Scanning (AREA)

Claims (2)

  1. Transformateur d'intensité bobiné comportant au moins un noyau de fer annulaire (2), qui porte un enroulement secondaire (3), un enroulement primaire (5) dont les spires traversent la fenêtre (4) du noyau de fer (2) et qui comporte une gaine conductrice, et un condensateur annulaire (10), qui est appliqué contre l'enroulement secondaire (3), dans la fenêtre (4) du noyau de fer (2), possède une fente longitudinale continue (12) et dont deux armatures (14,19), qui constituent les électrodes du condensateur annulaire (10) et sont situées sur des faces différentes de ce condensateur, sont pourvues de conducteurs électriques de raccordement (17,18) pour des bornes de raccordement secondaires,
    caractérisé par le fait qu'entre les armatures (14,19) sont disposés des inserts conducteurs cylindriques (15,16), qui s'étendent au moins sur une partie de la longueur du condensateur annulaire (10), en étant orientés coaxialement, et sont raccordés aux conducteurs de raccordement (17,18).
  2. Transformateur d'intensité bobiné suivant la revendication 1, caractérisé par le fait que dans le cas de deux inserts, l'insert (15), qui est voisin de l'armature intérieure (14), est raccordé au conducteur de raccordement électrique de l'armature extérieure (19), et l'insert (16), qui est voisin de l'armature extérieure (19), est raccordé au conducteur de raccordement électrique (17) de l'armature intérieure (14).
EP89730117A 1988-05-19 1989-05-10 Transformateur d'intensité enroulé Expired - Lifetime EP0343099B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89730117T ATE85152T1 (de) 1988-05-19 1989-05-10 Wickelstromwandler.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8806688U 1988-05-19
DE8806688U DE8806688U1 (de) 1988-05-19 1988-05-19 Wickelstromwandler

Publications (2)

Publication Number Publication Date
EP0343099A1 EP0343099A1 (fr) 1989-11-23
EP0343099B1 true EP0343099B1 (fr) 1993-01-27

Family

ID=6824299

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89730117A Expired - Lifetime EP0343099B1 (fr) 1988-05-19 1989-05-10 Transformateur d'intensité enroulé

Country Status (3)

Country Link
EP (1) EP0343099B1 (fr)
AT (1) ATE85152T1 (fr)
DE (2) DE8806688U1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013211811A1 (de) * 2013-06-21 2014-12-24 Siemens Aktiengesellschaft Wandlereinheit, insbesondere Kombinationswandler
EP3371817B1 (fr) * 2015-11-05 2025-08-06 HM Power AB Capteur de courant
CN108335894A (zh) * 2018-04-08 2018-07-27 国网重庆市电力公司电力科学研究院 一种新型防恒定磁场电流互感器

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3173114A (en) * 1962-01-17 1965-03-09 Westinghouse Electric Corp Electrical inductive apparatus
US3299383A (en) * 1965-11-04 1967-01-17 Westinghouse Electric Corp Current transformer having fluid carry passages in high voltage conductor
DE3166324D1 (en) * 1981-04-28 1984-10-31 Sprecher & Schuh Ag Current transformer with annular case to be built in a metal cast high-tension switchgear installation
DE8426556U1 (de) * 1984-09-05 1986-11-06 Siemens AG, 1000 Berlin und 8000 München Wickelstromwandler

Also Published As

Publication number Publication date
DE8806688U1 (de) 1988-07-14
ATE85152T1 (de) 1993-02-15
EP0343099A1 (fr) 1989-11-23
DE58903381D1 (de) 1993-03-11

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