US3243748A - Installation of tap changing devices in transformers - Google Patents

Installation of tap changing devices in transformers Download PDF

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Publication number
US3243748A
US3243748A US305336A US30533663A US3243748A US 3243748 A US3243748 A US 3243748A US 305336 A US305336 A US 305336A US 30533663 A US30533663 A US 30533663A US 3243748 A US3243748 A US 3243748A
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US
United States
Prior art keywords
changing devices
tap
framework
tank
installation
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
US305336A
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English (en)
Inventor
Lehmann Alfred
Pusterhofer Walter
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.)
Andritz Hydro GmbH Austria
Original Assignee
Andritz Hydro GmbH Austria
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 Andritz Hydro GmbH Austria filed Critical Andritz Hydro GmbH Austria
Application granted granted Critical
Publication of US3243748A publication Critical patent/US3243748A/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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/40—Structural association with built-in electric component, e.g. fuse

Definitions

  • the present invention relates to the installation of tap changing devices in transformers.
  • this invention relates to a special problem of transformer design, namely to the installation of tap changing devices within transformer tanks having bell-shaped covers.
  • bell-shaped cover is meant a transformer cover or hood, the gasket flange of which, between the cover and the tank proper, runs adjacent the bottom of the transformer tank.
  • the cover has the appearance of a bell hooding the working or effective parts of the transformer.
  • This mode of tank construction has the advantage that in case of a repair, overhaul or supervisory work on the working parts of the transformer, upon having drained the tank oil, it is only necessary to lift the comparatively light cover for which no exceptional lifting devices are required. There are, however, some difficulties resulting from this tank construction in regard to the installation of tap changing devices.
  • the tap changing device attached to the core and winding clamping structure changes its height after the transformer baking (drying out the core and coils) while the internal tank height remains unchanged. Consequently, difficulties result in sealing the tap changing device within the transformer tank.
  • the main object of this invention is to avoid the aforementioned sealing difliculties as regards tap changing devices associated with transformers having bell-shaped covers.
  • FIG. 1 shows the installation of three tap changing devices in accordance with the present invention
  • FIG. 2 is a sectional view of a detail of this installation, on an enlarged scale.
  • a transformer tank is shown, with supporting columns, bell-shaped cover or hood, and details of the tap changing devices with their installation according to the present invention.
  • numerals 10, 10', 10" denote three tap changing devices which are jointly mounted on a plate 2.
  • Plate 2 in its turn rests on a framework 1 which is supported by columns 3 resting on the transformer tank bottom.
  • the ends of these columns 3 on the side of the framework 1 are formed as spindles 5 for raising and lowering the framework 1.
  • these spindles 5 may be readily operated.
  • the framework 1 is sufiiciently lifted, it is held together with a transformer 3,243,748 Patented Mar. 29, 1966 "ice cover 11 by means of screws 6 and packings 4.
  • the spindles 5 are secured by means of nuts 7.
  • numeral 9 denotes the sealing flange between the bell-shaped cover and the lower part of the transformer tank.
  • the tap changing devices 10, 10', 10 are entirely separate from the clamping structure for the transformer core and the windings. Therefore, it is possible to mount the tap changing devices independent of and separate from the transformer core.
  • the clamping structure may be tightened after heating up the transformer core and coils, irrespective of the attachment of the tap changing devices.
  • bell-shaped cover may readily be bolted to the lower part of the transformer tank.
  • a lever-difference between the cover and the framework 1, possibly existing after the cover has been set up, may be corrected by raising the framework 1 to a rate corresponding to the height of the packings 4, by means of the spindles 5.
  • the framework 1 supporting the tap changing devices 10, etc. is raised to the cover 11, by the intermediary of the spindles 5, to such an extent that the sealing screws 6 actually have to apply only the clamping pressure when these screws are subsequently tightened but are not bound to take part in supporting the tap changing devices by means of the framework 1.
  • the supporting task is undertaken solely by the columns 3. In this way reliable sealing of the tap changing device is guaranteed, even with transformers having bellshaped covers.
  • An oil-filled transformer having a tank with a bellshaped cover, apertures in the top thereof, and tap-changing devices mounted over said apertures, a supporting installation comprising columns resting on the bottom of said tank, a framework attached to said columns and mounting said tap-changing devices, and adjusting means between said columns and said framework for regulating the height of said tap-changing devices with respect to said tank, said adjusting means including a spindle supporting a portion of said framework from the free end of each column, and holes in said bell-shaped cover adjacent said spindles to permit access for adjustment thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Housings And Mounting Of Transformers (AREA)
US305336A 1962-08-31 1963-08-29 Installation of tap changing devices in transformers Expired - Lifetime US3243748A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT697262A AT235408B (de) 1962-08-31 1962-08-31 Stufenschaltereinbau für Transformatoren

Publications (1)

Publication Number Publication Date
US3243748A true US3243748A (en) 1966-03-29

Family

ID=3591545

Family Applications (1)

Application Number Title Priority Date Filing Date
US305336A Expired - Lifetime US3243748A (en) 1962-08-31 1963-08-29 Installation of tap changing devices in transformers

Country Status (2)

Country Link
US (1) US3243748A (de)
AT (1) AT235408B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5219721A (en) * 1992-04-16 1993-06-15 Eastman Kodak Company Silver halide photographic emulsions sensitized in the presence of organic dichalcogenides
US9601260B2 (en) * 2013-08-12 2017-03-21 Abb Schweiz Ag Method of manufacturing an electromagnetic induction device and an electromagnetic induction device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1583383A (en) * 1920-06-02 1926-05-04 Pittsburgh Transformer Co Oil-cooled transformer
US2158103A (en) * 1935-09-14 1939-05-16 Allg Elek Citatz Ges Coupling device
US2479330A (en) * 1944-08-19 1949-08-16 Gen Electric Induction regulator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1583383A (en) * 1920-06-02 1926-05-04 Pittsburgh Transformer Co Oil-cooled transformer
US2158103A (en) * 1935-09-14 1939-05-16 Allg Elek Citatz Ges Coupling device
US2479330A (en) * 1944-08-19 1949-08-16 Gen Electric Induction regulator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5219721A (en) * 1992-04-16 1993-06-15 Eastman Kodak Company Silver halide photographic emulsions sensitized in the presence of organic dichalcogenides
US9601260B2 (en) * 2013-08-12 2017-03-21 Abb Schweiz Ag Method of manufacturing an electromagnetic induction device and an electromagnetic induction device

Also Published As

Publication number Publication date
AT235408B (de) 1964-08-25

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