US3344380A - Regulating transformer - Google Patents

Regulating transformer Download PDF

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Publication number
US3344380A
US3344380A US352904A US35290464A US3344380A US 3344380 A US3344380 A US 3344380A US 352904 A US352904 A US 352904A US 35290464 A US35290464 A US 35290464A US 3344380 A US3344380 A US 3344380A
Authority
US
United States
Prior art keywords
oil
tank
transformer
transfer
switch
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
US352904A
Other languages
English (en)
Inventor
Schmied August
Jan Wilhelm
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 US3344380A publication Critical patent/US3344380A/en
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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling

Definitions

  • the oil level of the expansion tank part which receives the fluctuations of the transformer tank oil volume is in many cases protected against contact with the outside air by an inert gas shield or by covering the same with an elastic diaphragm. In doing so, however, the disadvantage results that the oil volume of the on-load tap changer comes into contact with the atmosphere and, therefore, absorbs oxygen and hydrogen. It should be noted that working conditions may occur under which a higher oil level results in the section of the expansion tank which is allotted to the on-load tap changer than in the remaining section of the conservator. Also, the sealing off of the tap changer casing or container against the surrounding tank oil can be judged as being only dripproof, at least for a prolonged time. Under such conditions, the differences of oil levels between the expansion tank sections will allow the oil of the on-load tap changer casing to leak off into the transformer tank, contaminating the latter.
  • a static pressure head with reversed direction may also cause tank oil to enter the tap casing, which casing is undesirable with regard to regular operation.
  • a pressure head in said direction results mostly if the tank oil level is shielded or covered by an inert gas layer or cushion, and/or the tank oil has a much higher temperature than the oil of the on-load tap changer container.
  • a known expedient to this end is to provide an exhaust valve, inserted into the oil pipe leading from the transfer switch casing to the expansion tank, by which the gas bubbles ascending in this pipe are gathered and discharged into the atmosphere (see US. Patent No. 2,960,672, to Kowatschitsch et a1., entitled Transformer). Even in doing so it is not possible entirely to eliminate pressure differences as under certain operating conditions level differences can still result between the tank oil and the transfer switch oil, and therewith a pressure head may build up in the one or the other directionowing to the different volumes of the tank oil and the transfer switch oil, and also owing to the different temperatures.
  • This invention relates to a regulating transformer, the on-load tap changer of which is submerged into the transformer tank, the casing of its transfer switch being only drip-proof with respect to the surrounding tank oil, and an exhaust valve being inserted into the oil pipe leading from the transfer switch casing to the expansion tank.
  • a non-subdivided expansion tank common to both the tank oil and the transfer switch oil, the oil level in said expansion tank being shielded against the outside air by an inert gas cushion or by an elastic diaphragm, and an oil filter being inserted into the oil pipe leading from the transfer switch casing to the expansion tank.
  • 1 indicates an expansion tank of a transformer, generally identified by numeral 20, while 2, 3a and 3b are oil pipes leading from said expansion tank 1 to a transformer tank 21 and to a transfer switch casing 22, respectively.
  • the casing 22 lodges a selector switch and/ or an on-load tap changer, both being known per se for regulating transformers of the described type.
  • an exhaust valve 4 is inserted between the pipe sections 3a and 3b. This is usually a float valve in the upper part of which gas bubbles may gather until gas pressure exceeds the buoyancy of a float 11, and a disk valve is opened by means of a lever arrangement 12, thus. allowing the gathered bubbles to escape through a pipe 5 to the outside air.
  • an oil filter is provided in accordance with this invention, which is constructionally combined with the exhaust valve 4.
  • the oil level within the expansion tank 1 is covered by a diaphragm 6.
  • the expansion tank is only subdivided by a low partition wall 8 arranged far below the minimum oil level.
  • An oil drain 9 makes it possible to rinse this part of the expansion tank 1 from time to time, and another oil drain It ⁇ to rinse the filter 7 and the casing of the exhaust valve 4.
  • a perfect oil shield is achieved, that is to say an oil shield which also includes the oil of the transfer switch casing, without being compelled to satisfy too high requirements as to the tightness of the casing which seals the transfer switch 22 against the oil in tank 21.
  • the only requirement is that the flow resistance of the filter 7 provided in accordance with the present invention, is smaller than that through possible leaks of the transfer switch casing 22. No doubt, this requirement is easy to be fulfilled and to be guaranteed, also in the long run.
  • a regulating transformer having its on-load tap changer submerged in the transformer tank, the transfer switch of said tap changer being enclosed in a separate casing sealing oh the oil in said transfer switch against the oil in the surrounding transformer tank in a drip-proof manner, an oil pipe leading from said transfer-switch casing to an expansion tank at a level higher than that of said transformer tank, said expansion tank serving for said transfer-switch oil as well as for said transformer-tank oil in its unitary inner space devoid of dividing means that would separate the said two kinds of oils, means for eliminating both gaseous and solid contaminations from said transfer-switch oil, resulting from switching operations Within said transfer-switch casing, said eliminating means being inserted in said oil pipe, and including an exhaust valve and an oil filter, the latter being structurally combined with said exhaust valve and disposed at a level lower than that of said exhaust valve, the latter serving to exhaust gas bubbles resulting from said switching operations while said oil filter serves to eliminate solid contaminations resulting from said switching operations, and means toshield
  • said shielding means is constituted by a layer of inert gas resting above said oil level in said expansion tank, and including both said transfer-switch oil and said transformer-tank Oil.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Housings And Mounting Of Transformers (AREA)
US352904A 1963-03-29 1964-03-18 Regulating transformer Expired - Lifetime US3344380A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT254063A AT235393B (de) 1963-03-29 1963-03-29 Regeltransformator

Publications (1)

Publication Number Publication Date
US3344380A true US3344380A (en) 1967-09-26

Family

ID=3536094

Family Applications (1)

Application Number Title Priority Date Filing Date
US352904A Expired - Lifetime US3344380A (en) 1963-03-29 1964-03-18 Regulating transformer

Country Status (3)

Country Link
US (1) US3344380A (de)
AT (1) AT235393B (de)
CH (1) CH414845A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5976226A (en) * 1997-12-18 1999-11-02 Bastian; Juergen Means to ensure a minimum of gas content in liquids used for heat exchange and insulating purposes with complementary means for liquid expansion into vessels with variable volumes
EP2290663A1 (de) 2009-08-29 2011-03-02 ABB Technology AG Öltransformator

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1548733A (en) * 1924-08-15 1925-08-04 Gen Electric Method and apparatus for treating oil
US1622030A (en) * 1922-12-07 1927-03-22 Pittsburgh Transformer Co Casing for electrical apparatus
US1964684A (en) * 1931-04-02 1934-06-26 Gen Electric Electrical apparatus
US2509935A (en) * 1946-04-13 1950-05-30 Mcgraw Electric Co Protective means for electrical instrumentalities
US2915720A (en) * 1954-01-13 1959-12-01 Elin Union Ag Fur Elek Sche In Transformer with a bell-shaped cover and an on-load-tap-changing device
US2960672A (en) * 1958-05-21 1960-11-15 Elin Ag Fur Elek Sche Ind Transformer
US2961476A (en) * 1958-06-24 1960-11-22 Westinghouse Electric Corp Electrical apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1622030A (en) * 1922-12-07 1927-03-22 Pittsburgh Transformer Co Casing for electrical apparatus
US1548733A (en) * 1924-08-15 1925-08-04 Gen Electric Method and apparatus for treating oil
US1964684A (en) * 1931-04-02 1934-06-26 Gen Electric Electrical apparatus
US2509935A (en) * 1946-04-13 1950-05-30 Mcgraw Electric Co Protective means for electrical instrumentalities
US2915720A (en) * 1954-01-13 1959-12-01 Elin Union Ag Fur Elek Sche In Transformer with a bell-shaped cover and an on-load-tap-changing device
US2960672A (en) * 1958-05-21 1960-11-15 Elin Ag Fur Elek Sche Ind Transformer
US2961476A (en) * 1958-06-24 1960-11-22 Westinghouse Electric Corp Electrical apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5976226A (en) * 1997-12-18 1999-11-02 Bastian; Juergen Means to ensure a minimum of gas content in liquids used for heat exchange and insulating purposes with complementary means for liquid expansion into vessels with variable volumes
EP2290663A1 (de) 2009-08-29 2011-03-02 ABB Technology AG Öltransformator
WO2011023295A1 (de) * 2009-08-29 2011-03-03 Abb Technology Ag Öltransformator

Also Published As

Publication number Publication date
CH414845A (de) 1966-06-15
AT235393B (de) 1964-08-25

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