US3708774A - Potential transformer having a bar-shaped magnetic core - Google Patents

Potential transformer having a bar-shaped magnetic core Download PDF

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Publication number
US3708774A
US3708774A US00192921A US3708774DA US3708774A US 3708774 A US3708774 A US 3708774A US 00192921 A US00192921 A US 00192921A US 3708774D A US3708774D A US 3708774DA US 3708774 A US3708774 A US 3708774A
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US
United States
Prior art keywords
bar
tank
shaped
core
high voltage
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
US00192921A
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English (en)
Inventor
S Menju
H Aoyagi
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.)
Toshiba Corp
Original Assignee
Tokyo Shibaura Electric Co Ltd
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 Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
Application granted granted Critical
Publication of US3708774A publication Critical patent/US3708774A/en
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
    • H01F38/24—Voltage transformers
    • H01F38/26—Constructions

Definitions

  • a potential transformer having a bar-shaped magnetic core is provided.
  • a winding assembly includes a primary winding which is wound on the core and a secondary winding which is wound on the primary winding.
  • a cone-shaped coil supporting insulator is provided and is fixed at a flange portion thereof to a tank, which houses the components of the transformer.
  • the core is supported at a center portion of the insulator, and the winding assembly is supported on the inside wall of the insulator.
  • a magnetic shield is provided so as to cover the assembly and is attached to the inside wall of the tank. An insulation gas is filled in the tank.
  • a potential transformer comprises a tank, a magnetically closed core, and low voltage and high voltage windings.
  • the low voltage winding is wound on the core through an insulator, and the high voltage winding is wound on the low voltage winding.
  • the resultant combination is then positioned in the tank and the same is then filled with an insulating oil.
  • the prior art transformer as described above is of a relatively large size, since a magnetically closed core is used and since the length between the tank and the high voltage winding must be great because of the necessity of providing insulation.
  • One other object of the present invention is to provide a new and improved potential transformer having a bar-shaped magnetic core which will not be rapidly damaged in the presence of a fire.
  • a tank for housing the components of a transformer.
  • Means are provided for maintaining a bar-shaped core within the tank at the same potential as the primary high voltage.
  • a winding assembly which includes a primary winding wound on the bar-shaped core and a secondary winding wound on the primary winding is provided.
  • a cone-shaped coil supporting insulator is fixed at a flange portion thereof to the tank and the core is supported at the center portion of the insulator.
  • the winding assembly is also supported on the inside wall of the insulator.
  • a magnetic shield is provided to cover the winding assembly and for providing a return path for magnetic flux. The magnetic shield is attached to the inside of the tank and an insulation gas is filled within the tank.
  • FIG. 1 is a side view, partially in cross-section, of a potential transformer according to this invention
  • FIG. 2 is a perspective view, partially cut away, of a potential transformer according to this invention.
  • FIG. 3 is a perspective view,partially cut away, of the coil supporting insulator shown in FIG. 1;
  • FIG. 4 is a plane view of the high voltage shield shown in FIG. 1.
  • FIGS. 1 and 2 wherein the potential transformer of the present invention is shown as including a cylindrical tank 10 having an upper portion 1 and a closed bottom portion 3.
  • the coil supporting insulator 9 is shown in detail with reference to FIG. 3.
  • FIG. 3 it is seen that the insulator 9 is opened at a top portion thereof and a high voltage shield ring 15 is embedded and inwardly positioned at the mouth portion of the insulator 9.
  • a round end shield 17 is partially inserted into the mouth portion of the insulator 9 so that the upper portion thereof extends through the shield ring 15.
  • the round end shield 17 is fixed to the shield ring 15 by a nut 19 which is applied to the upper portion of the end shield 17.
  • a bar-shaped core 23 is provided and has a hole penetrating therethrough for receiving a supporting bar 21.
  • the bar-shaped core 23 is positioned on the end shield 17 through an insulating ring 25.
  • An insulating cylinder 27 is then fitted around the barshaped core 23,and a shield winding 29 is wound around the cylinder 27.
  • a high voltage primary winding 31 is provided and is divided into a plurality of sections. Each section of the primary winding 31 is stacked over the shield winding 29, and is supported on an inside wall of the coil supporting insulator 9 by supporting members 33.
  • a secondary winding 37 is wound on the primary winding 31 through an insulator 35 to thereby form a winding assembly.
  • a flange 39 is provided at a top portion of the upper tank 1, and a cone-shaped insulator 41 is attached to the flange 39 by bolts (not shown).
  • the cone-shaped insulator 41 is of a configuration similar to that of the coil supporting insulator 9.
  • a shield ring 45 is embedded at a mouth portion of the insulator 41 and a rod contact 47 is attached to the shield ring 45. The uppermost or head portion of the contact 47 protrudes from the cone-shaped insulator 41 and is connected to the high voltage input.
  • a cup-shaped connecting conductor 49 is attached at a bottom portion thereof to the supporting bar 21. Finger contacts 51 are disposed between the connecting conductor 49 and the contact 47 such that the high voltage input supplied to the contact 47 will be led to the supporting bar 21 and then to the core 23.
  • the insulation between the core 23 and the primary winding 31 can be very easily made.
  • any potential unbalance resulting from the concave and convex shape of the surface of the core 23 is easily smoothed by the provision of the shield winding 29.
  • a high voltage shield cylinder 53 having four clamps 55 as shown in FIG. 4 is provided and serves to cover and insulate the high potential portions, such as the conductor 49.
  • the shield cylinder 53 is attached to the supporting bar 21 by a cylindrically shaped clamp member 57.
  • the clamp member 57 has a flange for connecting the clamps 55 of the shield cylinder 53.
  • fins 59 are provided over the tank for cooling the transformer therein.
  • An insulation gas such as sulpher-hexafluoride (SF )gas, is supplied to the tank 10 through an inlet 61 for insulating the elements therein. The insulation gas is exhausted through an outlet 63.
  • a ground terminal box 65 for the primary high voltage and a secondary terminal box 67 are also provided at the tank 10.
  • a plurality of magnetic shield boards 69 each having an elongated rectangular shape,are circumferentially separated and provided along the inside of the tank 10 to thereby provide a return path for the magnetic flux flowing within the tank and to prevent the generation of eddy currents.
  • the boards 69 are secured to the tank 10 by bolts 71 and nuts 73.
  • a potential transformer having a bar-shaped magnetic core comprising:
  • said tank has an upper portion and a lower portion, each having flanges thereon and wherein said cone-shaped coil supporting insulator has a flanged portion which is positioned between the flanges of said upper and lower portions of said tank.
  • said magnetic shield means are made up of a plurality of elongated rectangular magnetic boards which are separated from each other and which are positioned on the inner surface of said tank.
  • a potential transformer having a bar-shaped core comprising:
  • a winding assembly including a primary winding wound on said core for receiving a high voltage and a secondary winding wound on said primary winding,

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Transformer Cooling (AREA)
US00192921A 1970-10-31 1971-10-27 Potential transformer having a bar-shaped magnetic core Expired - Lifetime US3708774A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45095648A JPS509969B1 (de) 1970-10-31 1970-10-31

Publications (1)

Publication Number Publication Date
US3708774A true US3708774A (en) 1973-01-02

Family

ID=14143311

Family Applications (1)

Application Number Title Priority Date Filing Date
US00192921A Expired - Lifetime US3708774A (en) 1970-10-31 1971-10-27 Potential transformer having a bar-shaped magnetic core

Country Status (8)

Country Link
US (1) US3708774A (de)
JP (1) JPS509969B1 (de)
AU (1) AU458275B2 (de)
CA (1) CA937305A (de)
CH (1) CH548660A (de)
DE (1) DE2154398C3 (de)
FR (1) FR2116390B1 (de)
GB (1) GB1311456A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4509032A (en) * 1982-03-03 1985-04-02 U.S. Philips Corporation Mains transformer

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2325441C2 (de) * 1973-05-17 1989-07-20 Siemens AG, 1000 Berlin und 8000 München Meßwandler zum Einbau in eine Metallkapsel einer Schaltanlage
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
DE2843608C2 (de) * 1978-10-06 1983-09-29 Friedrich Dr.-Ing. e.h. 8600 Bamberg Raupach Transformator, insbesondere Spannungswandler oder Prüftransformator
CN110444377B (zh) * 2019-09-09 2024-04-23 大连北方互感器集团有限公司 一种电压互感器一次线圈高压屏蔽装置及其制作方法

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1499931A (en) * 1922-04-15 1924-07-01 Edward B Jacobson Induction or ignition coil
US1647417A (en) * 1925-05-07 1927-11-01 Delco Remy Corp Ignition coil
GB365483A (en) * 1930-06-27 1932-01-21 Bbc Brown Boveri & Cie Protective means for massive metal parts against stray magnetic fields
US1926348A (en) * 1932-01-02 1933-09-12 Delco Remy Corp Lock coil
US2036096A (en) * 1928-06-18 1936-03-31 Oscar H Pieper X-ray apparatus
US2062014A (en) * 1936-02-08 1936-11-24 Piffath Peter Induction coil
US2404404A (en) * 1943-05-15 1946-07-23 Rca Corp High-frequency apparatus
US2416148A (en) * 1944-05-27 1947-02-18 Int Harvester Co Ignition coil
US2478983A (en) * 1946-07-01 1949-08-16 Runbaken Julian Henry Electrical apparatus
US3546647A (en) * 1969-08-08 1970-12-08 Eltra Corp Electric coil construction

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1499931A (en) * 1922-04-15 1924-07-01 Edward B Jacobson Induction or ignition coil
US1647417A (en) * 1925-05-07 1927-11-01 Delco Remy Corp Ignition coil
US2036096A (en) * 1928-06-18 1936-03-31 Oscar H Pieper X-ray apparatus
GB365483A (en) * 1930-06-27 1932-01-21 Bbc Brown Boveri & Cie Protective means for massive metal parts against stray magnetic fields
US1926348A (en) * 1932-01-02 1933-09-12 Delco Remy Corp Lock coil
US2062014A (en) * 1936-02-08 1936-11-24 Piffath Peter Induction coil
US2404404A (en) * 1943-05-15 1946-07-23 Rca Corp High-frequency apparatus
US2416148A (en) * 1944-05-27 1947-02-18 Int Harvester Co Ignition coil
US2478983A (en) * 1946-07-01 1949-08-16 Runbaken Julian Henry Electrical apparatus
US3546647A (en) * 1969-08-08 1970-12-08 Eltra Corp Electric coil construction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4509032A (en) * 1982-03-03 1985-04-02 U.S. Philips Corporation Mains transformer

Also Published As

Publication number Publication date
DE2154398B2 (de) 1976-11-25
CH548660A (fr) 1974-04-30
DE2154398A1 (de) 1972-05-04
CA937305A (en) 1973-11-20
DE2154398C3 (de) 1979-10-04
FR2116390A1 (de) 1972-07-13
FR2116390B1 (de) 1975-04-18
AU458275B2 (en) 1975-02-20
GB1311456A (en) 1973-03-28
JPS509969B1 (de) 1975-04-17
AU3523571A (en) 1973-05-10

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