US3792396A - Voltage transformer - Google Patents

Voltage transformer Download PDF

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Publication number
US3792396A
US3792396A US00343147A US3792396DA US3792396A US 3792396 A US3792396 A US 3792396A US 00343147 A US00343147 A US 00343147A US 3792396D A US3792396D A US 3792396DA US 3792396 A US3792396 A US 3792396A
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US
United States
Prior art keywords
winding
voltage transformer
main insulator
insulator
core section
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
US00343147A
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English (en)
Inventor
V Panu
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.)
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 US3792396A publication Critical patent/US3792396A/en
Anticipated expiration legal-status Critical
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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
    • H01F38/24—Voltage transformers
    • H01F38/26—Constructions

Definitions

  • ABSTRACT A voltage transformer comprising a hollow support insulator within which is arranged a main insulator and associated with this, a magnetic circuit, 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 said first winding.
  • the magnetic circuit comprises two separate core sections, one of which extends from the surface of the main insulator, enclosing the first winding, at least approximately to the other end of the main insulator and the other of which extends from the surface of the main insulator, enclosing from inside the second winding, to the said other end of the main insulator where it meets the other end ofthe first core section.
  • This invention concerns a voltage 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, togetherwith necessary conductors.
  • ln pin core type voltage transformers the core con sists of a ferromagnetic pin onto which the secondary winding is wound in the form of a long cylinder.
  • the main insulation which is tube shaped is fitted over the secondary winding and carries the cylindrical primary winding.
  • the magnetic circuit is closed across an air gap which means that the equivalent air gap of the magnetic circuit is relatively long.
  • a large iron crosssectional area and/or a large'number of winding turns are necessary in order to obtain sufficiently high offload inductance.
  • the dimensions of the active parts of the transformer and therefore the material costs are high.
  • the potential, during high speed voltage variation phenomena, is distributed in a non-linear fashion in the longitudinal direction of the primary winding owing to the large earth capacitance, necessitating more insulation between the upper turns than elsewhere in the winding.
  • the purpose of the invention is to eliminate these aforementioned disadvantages.
  • the voltage 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.
  • first winding either a primary or a secondary winding
  • second winding either a secondary or a primary winding
  • the magnetic circuit comprises two separate core sections, one of which extends from the surface of the main insulator, enclosing the first winding, at least approximately to the other end of the main insulator, and the other of which extends from the surface of the main insulator, enclosing from inside the second winding, to the said other end of the main insulator where it meets the other end of the first core section.
  • the invention is described in more detail in the following with reference to the attached drawing.
  • the drawing shows a cross-section of one embodiment of the voltage transformer in accordance with the invention.
  • the main insulator tube 1 of the transformer has a length 2H-l-H, where H a the shortest permissible distance over which the voltage can be distributed in the axial direction of the support insulator, and H the height of the yoke through which the insulator tube passes.
  • the main insulator tube 1 is made up of cylinders of metal foil 11 of mutually equal length H+H' located inside each other and thin insulating cylinders 12 of mutually equal thickness and greater length than the foil cylinders 11, lcoated 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 1 and correspondingly at the other end, the same distance nearer to the midpoint of the main insulator tube 1 than the end of the next metal foil cylinder inside, where m the number of insulating cylinders 12.
  • a primary winding 5 is wound coaxially to the main insulator tube 1 over a distance H, beginning from one end of the main insulator tube 1, in such a manner that the ends of the metal foil cylinders 11 are at the same level as the primary winding 5, and on the same side of the main insulator tube 1 as the primary winding 5 in the radial direction.
  • a secondary winding 4 is wound, level with the primary winding 5 in the axial direction, but, in the radial direction, on the opposite side of the main insulator tube 1.
  • the other half 3,6 of the magnetic circuit 2,3,6 comprises a magnetic column 6, electrically insulating in the longitudinal direction, which extends from the lower end 14 of the primary winding 5 which is at earth potential, to the high voltage end, and a yoke 3 which extends from the high voltage end 15 of the primary winding 5 to the surface of the middle section of the main insulator tube 1 on the same level, but at the other side of tube 1 in a radial direction, than the half 2 of the magnetic circuit which is at earth potential.
  • a magnetic circuit which encloses the primary and secondary windings 5, 4 and that section of the main insulator tube 1 located between them is thus formed, the circuit being broken by the main insulator tube with an air gap whose length is the insulation thickness.
  • Core 2,3,6 together with windings 5, 4 and main insulator tube 1 is located within a hollow support insulator 7 in such a way that the axis of the main insulator tube 1 is parallel to the axisof the support insulator 7 and that the end of the main insulator tube 1 where all the ends of the metal foil cylinders 11 are on the outer surface is completely within the support insulator 7.
  • the ferromagnetic inner column 2 which is at earth potential is provided with flanged ends 2" and functions as a reel body for the secondary winding 4 which has the form of a cylinder.
  • the main insulator tube 1 is wound over the cylinder made up of the ferromagnetic inner column 2 and the secondary winding 4 in such a manner that the lower end of the innermost metal foil cylinder is on a level with the lower end of the secondary winding 4 and the end of the outermost metal foil layer 11 is opposite to the upper end of the secondary winding 4.
  • the lower end of the main insulating tube 1 is therefore composed of filler insulation 13 in order that the primary winding 5 can be wound onto a base having the form of a tube of constant diameter.
  • the turns of the primary winding 5 are uniformly distributed over the distance H and the distribution of potential is linear.
  • the ferromagnetic yoke 3 which is wholly at the potential of the upper end of the primary winding 5 is located between the upper end of the electrically insulating tube 6 and the outer surface of the middle section of the main insulating tube 1.
  • the main insulating tube 1 passes through the yoke 3, thus breaking the magnetic circuit 2,3,6 with an air gap whose length is the insulating thickness. The effect of the air gap on the characteristics of the magnetic circuit 2,3,6 can be decreased by increasing the height H of the yoke.
  • the positions of the primary and secondary windings can be interchanged, said electrically insulating magnetic tube 6 then being located inside the main insulator 1.
  • the core section 3,6 it is not necessary for the core section 3,6 to have the shape of a coaxial ring, but it can also have the form of, e.g., a column.
  • the core section 2 could be located around the main insulator and the first winding.
  • the core section 2" need not be provided with flanges, and it could also extend inwards (in the case where the primary winding is located inside the main insulator).
  • a voltage 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 extending from the outer surface of the main insulator, enclosing from outside said first winding, at least approximately to one end of said main insulator, said second core section extending from the inner surface of said main insulator, enclosing from inside said second winding, to said end of said main insulator where it meets one end of said first core section; and
  • the insulating elements of tubular form are of mutually equal length and are longer than the metal foil tube elements.
  • the first core section has the shape of a cylindrical ring and is provided with an inside groove for the first winding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Details Of Television Scanning (AREA)
  • Coils Of Transformers For General Uses (AREA)
US00343147A 1972-04-07 1973-03-20 Voltage transformer Expired - Lifetime US3792396A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI720975A FI46572C (fi) 1972-04-07 1972-04-07 Jännitemuuntaja.

Publications (1)

Publication Number Publication Date
US3792396A true US3792396A (en) 1974-02-12

Family

ID=8504907

Family Applications (1)

Application Number Title Priority Date Filing Date
US00343147A Expired - Lifetime US3792396A (en) 1972-04-07 1973-03-20 Voltage transformer

Country Status (12)

Country Link
US (1) US3792396A (US20110009641A1-20110113-C00116.png)
JP (1) JPS5431568B2 (US20110009641A1-20110113-C00116.png)
BE (1) BE797756A (US20110009641A1-20110113-C00116.png)
CH (1) CH560454A5 (US20110009641A1-20110113-C00116.png)
DK (1) DK133406B (US20110009641A1-20110113-C00116.png)
FI (1) FI46572C (US20110009641A1-20110113-C00116.png)
FR (1) FR2179250B1 (US20110009641A1-20110113-C00116.png)
GB (1) GB1427980A (US20110009641A1-20110113-C00116.png)
IT (1) IT983696B (US20110009641A1-20110113-C00116.png)
NO (1) NO138705B (US20110009641A1-20110113-C00116.png)
SE (1) SE381769B (US20110009641A1-20110113-C00116.png)
SU (1) SU587885A3 (US20110009641A1-20110113-C00116.png)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032837A (en) * 1975-02-18 1977-06-28 Oy Stromberg Ab Current transformer
US4060759A (en) * 1974-10-18 1977-11-29 Oy Stromberg Ab Tube-insulated shell-core current transformer
US4088953A (en) * 1975-01-06 1978-05-09 The Reluxtrol Company Eddy-current test probe utilizing a combination of high and low reluctance materials to optimize probe sensitivity
US5504419A (en) * 1992-04-03 1996-04-02 Moser-Glaser & Co. Ag Rod-core current transformer
US5587695A (en) * 1991-12-13 1996-12-24 Zellweger Luwa Ag Measuring transformer for solid-state electricity meters
US20190085058A1 (en) * 2012-12-13 2019-03-21 The Trustees Of The University Of Pennsylvania DNA Antibody Constructs And Method Of Using Same

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51104152A (ja) * 1975-03-10 1976-09-14 Yoshihiro Ishizaki Kanzainyorunetsukikannosadoho
DE2642216C2 (de) * 1976-09-20 1982-04-15 Messwandler-Bau Gmbh, 8600 Bamberg Spannungstransformator mit stabförmigem Eisenkern zur Verwendung als Ankopplungstransformator für Netzwerke mit überlagerter Tonfrequenzspannung, insbesondere Rundsteueranlagen
JPS5487314A (en) * 1977-12-23 1979-07-11 Texaco Development Corp Power generation method and apparatus
JPS58114833U (ja) * 1982-01-29 1983-08-05 ヤンマーディーゼル株式会社 Ｌｐｇ機関の吸気冷却装置
DE4338537A1 (de) * 1993-11-11 1995-05-18 Sachsenwerk Ag Induktiver elektrischer Wandler für Mittelspannung

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
FR904761A (fr) * 1943-05-10 1945-11-15 Brown Transformateur d'intensité pour très haute tension

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
FR904761A (fr) * 1943-05-10 1945-11-15 Brown Transformateur d'intensité pour très haute tension

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4060759A (en) * 1974-10-18 1977-11-29 Oy Stromberg Ab Tube-insulated shell-core current transformer
US4088953A (en) * 1975-01-06 1978-05-09 The Reluxtrol Company Eddy-current test probe utilizing a combination of high and low reluctance materials to optimize probe sensitivity
US4032837A (en) * 1975-02-18 1977-06-28 Oy Stromberg Ab Current transformer
US5587695A (en) * 1991-12-13 1996-12-24 Zellweger Luwa Ag Measuring transformer for solid-state electricity meters
US5504419A (en) * 1992-04-03 1996-04-02 Moser-Glaser & Co. Ag Rod-core current transformer
US20190085058A1 (en) * 2012-12-13 2019-03-21 The Trustees Of The University Of Pennsylvania DNA Antibody Constructs And Method Of Using Same

Also Published As

Publication number Publication date
DE2315522B2 (de) 1976-11-18
FI46572C (fi) 1973-04-10
DE2315522A1 (de) 1973-10-18
IT983696B (it) 1974-11-11
CH560454A5 (US20110009641A1-20110113-C00116.png) 1975-03-27
FR2179250B1 (US20110009641A1-20110113-C00116.png) 1976-11-12
NO138705C (no) 1978-10-25
JPS5431568B2 (US20110009641A1-20110113-C00116.png) 1979-10-08
DK133406C (US20110009641A1-20110113-C00116.png) 1976-10-04
BE797756A (fr) 1973-07-31
FI46572B (fi) 1973-01-02
DK133406B (da) 1976-05-10
GB1427980A (en) 1976-03-10
FR2179250A1 (US20110009641A1-20110113-C00116.png) 1973-11-16
JPS4915921A (US20110009641A1-20110113-C00116.png) 1974-02-12
SU587885A3 (ru) 1978-01-05
SE381769B (sv) 1975-12-15
NO138705B (no) 1979-07-17

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