US3795881A - High voltage current transformer - Google Patents

High voltage current transformer Download PDF

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Publication number
US3795881A
US3795881A US00343457A US3795881DA US3795881A US 3795881 A US3795881 A US 3795881A US 00343457 A US00343457 A US 00343457A US 3795881D A US3795881D A US 3795881DA US 3795881 A US3795881 A US 3795881A
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US
United States
Prior art keywords
winding
high voltage
current transformer
voltage current
insulator
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
US00343457A
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English (en)
Inventor
V Kalevi
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.)
Kymmene Oy
ABB Stromberg Oy
Original Assignee
Stromberg Oy AB
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 Stromberg Oy AB filed Critical Stromberg Oy AB
Application granted granted Critical
Publication of US3795881A publication Critical patent/US3795881A/en
Assigned to KYMI-STROMBERG OY reassignment KYMI-STROMBERG OY CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE DATE: OCTOBER 31, 1983 Assignors: OY STROMBERG AB (MERGED INTO) KYMI KYMMENE OY (CHANGED TO)
Assigned to STROMBERG OY, A COMPANY OF FINLAND reassignment STROMBERG OY, A COMPANY OF FINLAND ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KYMI-STROMBERG OY A COMPANY OF FINLAND
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01F38/28—Current transformers
    • H01F38/30—Constructions

Definitions

  • a high voltage current transformer comprising a hollow support insulator within which is arranged a main insulator, a magnetic circuit associated with this, at least one primary winding and at least one secondary winding together with necessary conductors.
  • the main insulator is of tubular form and made up of a number of metal foil tube elements located inside each other in such a manner as to overlap each other partially but not completely, with insulator elements of tubular form arranged between them.
  • a first winding (either a primary or a secondary winding) is located around the main insulator and a second winding (either a secondary or a primary winding) is located inside the main insulator approximately opposite to the said first winding.
  • the magnetic circuit comprises two separate core sections, one of which is arranged outside the main insulator and the other one inside it.
  • This invention concerns a high voltage current transformer comprising a hollow support insulator within which is arranged a main insulator, a magnetic circuit associated with this, at least one primary winding and at least one secondary winding, together with the necessary conductors.
  • a current transformer can be constructed out of columns which are electrically insulating and at the same time good magnetic conductors in a longitudinal direction, as shown in FIG. 1.
  • the current travelling along the primary conductor 1 induces a magnetomotive force m between the magnet bars 2.
  • the sum of the stray flux 5 thus induced and the secondary flux (1) makes up the primary flux 42,. The longer the bars, the greater is the stray flux.
  • the columns cannot be any shorter than the minimum longitudinal distance over which the voltage U can be safely distributed. For high voltages the columns are so long that it is necessary to have only a small number of primary ampere turns in order to limit the amount of stray flux. This in turn decreases the permissible loading of the transformer and increases its disturbance sensitivity. It is also necessary to use a matching transformer in order to decrease the number of ampere turns.
  • the purpose of the invention is to eliminate these aforementioned disadvantages.
  • the transformer in accordance with the invention is mainly characterised in that the main insulator is of tubular form and made up of a number of metal foil tube elements located inside each other in such a manner as to overlap each other partially but not completely, with insulator elements of tubular form fitted between them, in that at least one first winding (either a primary or a secondary winding) is located around the main insulator and at least one second winding (either a secondary or a primary winding) is located inside the main insulator at least approximately opposite to the said first winding and in that the magnetic circuit comprises two separate core sections, one of which is arranged outside the main insulator and encloses from outside at least partially said first winding, and the other one is arranged inside the main insulator and enclosures from inside at least partially said second winding.
  • first winding either a primary or a secondary winding
  • second winding either a secondary or a primary winding
  • FlG. l shows a schematic diagram of a conventional high voltage current transformer
  • FIG. 2 shows a cross-section of one embodiment of the current transformer in accordance with the invention.
  • the main insulator is formed by tube 2 whose length is 2H+H, where H z the shortest permissible distance over which the voltage can be distributed in the axial direction of the support insulator, and H is the length of the active parts of the current transformer in the axial direction of the tube.
  • the main insulator tube 2 is made up of cylinders of metal foil 10 oflength H+H located inside each other and thin insulating cylinders 11 of mutually equal thickness and greater length than the foil cylinders, located between the aforementioned metal foil cylinders.
  • the ends of the metal foil cylinders are located at a distance H/m further away from the midpoint of the main insulator tube 2, and correspondingly at the other end, the same distance nearer to the midpoint of the main insulator tube 2 than the end of the next metal foil cylinder inside, where m the number of insulating cylinders 11.
  • a primary winding cylinder- 4 of length H is wound on the middle part of the main insulator tube coaxially to the tube.
  • a secondary winding cylinder 5 is correspondingly wound, opposite to the primary winding 4 in the axial direction, but, in the radial direction, on the opposite side of the main insulator tube.
  • the magnetic circuit 3, 6 comprises two separate sections one, 6, of which is located outside the main insulator tube 2 and the other, 3, of which is placed inside it over the distance H. Each of them is at the same potential as that of the winding 4 or 5, located on the same side of the main insulator tube 2 in such a manner that the main insulator tube 2 cuts the magnetic circuit with two air gaps each of the length of the insulating thickness so that windings 4, 5 and that part of the main insulator tube 2 located between them remain within the magnetic circuit 3, 6.
  • the core 3, 6, together with windings 4, 5 and main insulator tube 2 is located within a hollow support insulator 8 in such a way that the axis of the main insulator tube 2 is parallel to the axis of the support insulator 8 and that the end (the lower end) of the main insulator tube 2 where all the ends of the metal foil cylinders 10 are on the outer sur face in completely within the support insulator 8.
  • the active parts of the transformer and the main insulator tube 2 are thus located completely within the support insulator 8.
  • the section 3 of the core which is at earth potential is in the shape of a reel with flanged ends and it functions as a reel body for the secondary winding 5, being at the same potential as it.
  • the main insulator tube 2, the ends of which extend a distance H at both ends beyond the ends of the core reel 3, is wound over the cylinder of constant cross-section made up of the core reel 3 and the secondary winding 5.
  • the potential is distributed along the longitudinal direction of the main insulator tube 2 inwards at the top part of tube 2 and outwards at the lower end.
  • the primary winding 4 is wound in the form of a cylinder on the main insulator tube 2 opposite to the secondary winding, 5, and the other half of the core 6, which is at the same potential as the primary winding, is located over this.
  • the effect of the air gap caused by the main insulator tube can be drecreased by increasing the yoke areas.
  • the positions of the primary and secondary windings can be interchanged, causing the main insulator tube to be located upsidedown.
  • a high voltage current transformer comprising:
  • a main insulator having tubular form and being arranged within said support insulator and being made up of a number of metal foil tube elements located inside each other in such a manner as to overlap each other at least partially, and of a number of tubular insulator elements arranged between said metal foil tube elements;
  • a magnetic circuit comprising a first and a second core section, said first core section being arranged around said main insulator and enclosing from outside at least partially said first winding, said second core section being arranged inside said main insulator and enclosing from inside at least partially said second winding;
  • a high voltage current transformer as claimed in claim 1 wherein the outer section of the core has the shape of a cylindrical ring and is provided with an inside groove for the first winding.
US00343457A 1972-04-07 1973-03-21 High voltage current transformer Expired - Lifetime US3795881A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI720974A FI46571C (fi) 1972-04-07 1972-04-07 Suurjännitevirtamuuntaja.

Publications (1)

Publication Number Publication Date
US3795881A true US3795881A (en) 1974-03-05

Family

ID=8504905

Family Applications (1)

Application Number Title Priority Date Filing Date
US00343457A Expired - Lifetime US3795881A (en) 1972-04-07 1973-03-21 High voltage current transformer

Country Status (12)

Country Link
US (1) US3795881A (xx)
JP (1) JPS5424092B2 (xx)
BE (1) BE797755A (xx)
CH (1) CH565436A5 (xx)
DK (1) DK134727B (xx)
FI (1) FI46571C (xx)
FR (1) FR2179249B1 (xx)
GB (1) GB1428241A (xx)
IT (1) IT983697B (xx)
NO (1) NO138706C (xx)
SE (1) SE381770B (xx)
SU (1) SU522830A3 (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5504419A (en) * 1992-04-03 1996-04-02 Moser-Glaser & Co. Ag Rod-core current transformer

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5322864U (xx) * 1976-08-03 1978-02-25
JP7133311B2 (ja) 2017-12-28 2022-09-08 株式会社タムラ製作所 リアクトル

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR839662A (fr) * 1937-12-15 1939-04-07 Asea Ab Transformateur de haute tension
DE726194C (de) * 1938-10-11 1942-10-08 Siemens Ag Regelbarer Hochspannungstransformator
US2849694A (en) * 1954-07-12 1958-08-26 Gen Electric Current transformer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR839662A (fr) * 1937-12-15 1939-04-07 Asea Ab Transformateur de haute tension
DE726194C (de) * 1938-10-11 1942-10-08 Siemens Ag Regelbarer Hochspannungstransformator
US2849694A (en) * 1954-07-12 1958-08-26 Gen Electric Current transformer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5504419A (en) * 1992-04-03 1996-04-02 Moser-Glaser & Co. Ag Rod-core current transformer

Also Published As

Publication number Publication date
CH565436A5 (xx) 1975-08-15
NO138706C (no) 1978-10-25
DE2315523B2 (de) 1977-06-16
NO138706B (no) 1978-07-17
DE2315523A1 (de) 1973-10-18
FR2179249B1 (xx) 1977-08-19
DK134727C (xx) 1977-05-31
FR2179249A1 (xx) 1973-11-16
IT983697B (it) 1974-11-11
BE797755A (fr) 1973-07-31
GB1428241A (en) 1976-03-17
DK134727B (da) 1977-01-03
SE381770B (sv) 1975-12-15
FI46571C (fi) 1973-04-10
FI46571B (fi) 1973-01-02
JPS4915924A (xx) 1974-02-12
SU522830A3 (ru) 1976-07-25
JPS5424092B2 (xx) 1979-08-18

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Legal Events

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AS Assignment

Owner name: KYMI-STROMBERG OY

Free format text: CHANGE OF NAME;ASSIGNOR:OY STROMBERG AB (MERGED INTO) KYMI KYMMENE OY (CHANGED TO);REEL/FRAME:004812/0053

Effective date: 19870807

AS Assignment

Owner name: STROMBERG OY, A COMPANY OF FINLAND,FINLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KYMI-STROMBERG OY A COMPANY OF FINLAND;REEL/FRAME:004782/0546

Effective date: 19870414

Owner name: STROMBERG OY, P.O. BOX 69, 65101 VAASA, FINLAND, A

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KYMI-STROMBERG OY A COMPANY OF FINLAND;REEL/FRAME:004782/0546

Effective date: 19870414