EP0957496A2 - Leistungs- und/oder Verteilungstransformator mit Lastumschalter - Google Patents

Leistungs- und/oder Verteilungstransformator mit Lastumschalter Download PDF

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Publication number
EP0957496A2
EP0957496A2 EP99201458A EP99201458A EP0957496A2 EP 0957496 A2 EP0957496 A2 EP 0957496A2 EP 99201458 A EP99201458 A EP 99201458A EP 99201458 A EP99201458 A EP 99201458A EP 0957496 A2 EP0957496 A2 EP 0957496A2
Authority
EP
European Patent Office
Prior art keywords
dielectric
tank
transformer according
transformer
fluid
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.)
Withdrawn
Application number
EP99201458A
Other languages
English (en)
French (fr)
Other versions
EP0957496A3 (de
Inventor
Silvia Volponi
Silvio Stangherlin
Dino Paleari
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 Trasformatori SpA
Original Assignee
ABB Trasformatori SpA
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 ABB Trasformatori SpA filed Critical ABB Trasformatori SpA
Publication of EP0957496A2 publication Critical patent/EP0957496A2/de
Publication of EP0957496A3 publication Critical patent/EP0957496A3/de
Withdrawn legal-status Critical Current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
    • 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
    • H01F27/02—Casings
    • 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
    • H01F27/125—Cooling by synthetic insulating and incombustible liquid
    • 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
    • H01F27/402—Association of measuring or protective means
    • 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
    • H01F27/402—Association of measuring or protective means
    • H01F2027/406—Temperature sensor or protection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H2009/0055—Oil filters for tap change devices

Definitions

  • the present invention relates to a power and/or distribution transformer equipped with an on-load tap changer.
  • the tap changer connected to the transformer is meant to vary the transformation ratio of the transformer so that the voltage can be adjusted according to the requirements of the service.
  • Power and/or distribution transformers provided with an on-load tap-changer normally use fluids which have different functions:
  • the fluid used is a liquid, for example mineral oil.
  • gases such as nitrogen, sulfur hexafluoride, hexafluoroethane, and the like, either alone or in mixed solutions, such as for example sulfur hexafluoride together with perfluorocarbon.
  • the aim of the present invention is to provide a power and/or distribution transformer provided with on-load tap changer which is not flammable.
  • an object of the present invention is to provide a power and/or distribution transformer provided with on-load tap changer which is not potentially explosive.
  • a further object of the present invention is to provide a power and/or distribution transformer provided with on-load tap changer which has a compact volume and is constructively simple.
  • a further object of the present invention is to provide a power and/or distribution transformer provided with on-load tap changer in which the liquids used inside the transformer and the tap changer are not toxic.
  • a further object of the present invention is to provide a power and/or distribution transformer provided with on-load tap changer in which. if the decomposition of the liquids contained in the transformer and in the tap-changer leads to toxic decomposition products, said products can be adsorbed and destroyed.
  • a further object of the present invention is to provide a power and/or distribution transformer provided with on-load tap changer in which the liquids are substantially maintenance-free.
  • a further but not the least object of the present invention is to provide a power and/or distribution transformer provided with on-load tap changer which is highly reliable, relatively easy to manufacture and at low costs.
  • a power and/or distribution transformer which comprises: a tank provided with a magnetic core, high- and low-voltage windings, adjustment windings, insulating partitions made of solid material which are interposed between said high- and low-voltage windings and a dielectric and cooling fluid;
  • the power and/or distribution transformer comprises a tank 1 which accommodates the actual transformer together with the on-load tap changer 13.
  • the power transformer comprises a magnetic core 3, a high-voltage winding 4, a low-voltage winding 5 and adjustment windings 6.
  • Said high-voltage and low-voltage windings 4 and 5 are interposed between insulating partitions 7 made of solid material which are meant to subdivide the insulation distance.
  • the tank I is filled with a fluid which has a dielectric and transformer cooling function and is designated by the reference numeral 20.
  • the tank I has, at its top, surge tank means 8 provided with an elastic sealing membrane 9 to allow the thermal expansion of the liquid 20 contained in the tank 1.
  • a gas protection device 10 which is sensitive to the pressure of the gases generated due to abnormal operation such as Buchholz relays, which are connected to means 18 for collecting said gases, inside which an active filter 11 is inserted: said filter is the subject of Italian Patent Application no. MI97A 002804.
  • the filter 11 is meant to neutralize toxic gaseous chemical species which develop clue to the decomposition of the liquid that is present in the tank 1.
  • the filter 11 can be located either/both in liquid phase or/and in gaseous phase.
  • the filter 11 can use as scavanger base compounds such as substances of the Jeffamine family or soda-lime or the like.
  • the tank 1 contains the on-load tap changer 13, which is meant to vary the transformation ratio of the transformer, so that the voltage can be adjusted according to the requirements of the service.
  • the on-load tap changer 13 has its own external tank and is constituted by a selector 14 which is electrically series-connected to at least one diverter switch 2.
  • the diverter switch 2 has arc contacts 16 and is filled with a dielectric and arc-quenching fluid 21, which is separated from the liquid that is present in the selector, designated by the reference numeral 22.
  • the liquid 22 of the selector is a dielectric fluid which mainly acts as lubricant for the kinematic systems of the selector.
  • the tap changer 13, and particularly the diverter switch 2 is connected to expansion means 17 to allow the expansion of the liquid 21 that is present in the diverter switch 2, which can be provided with an additional active filter 11.
  • protection means 15 which are sensitive to the pressure of the gases generated by the electric arcs in the diverter switch 2, such as a Buchholz relay, connected to means 19 for collecting said gases, inside which there is another active filter 11.
  • the on-load tap changer 13 can be of the sealed type, in order to saturate the liquid with oxygen and accordingly eliminate the formation of decomposition products of the fluid which are stable and harmful to the environment.
  • Figure 1 is a view of the embodiment of the invention in which the tap changer 13 is contained in the tank 1;
  • Figure 2 is instead a view of a second embodiment, in which the tap changer 13 is partially internal to the tank 1 of the transformer or external to the transformer, as shown in Figure 3 (third embodiment).
  • the selector 14 of the tap changer 13 can be directly immersed in the same fluid 20 of the transformer and the fluids 20 and 22 therefore coincide.
  • the fluid 21 is instead always separate from the fluid 20, although it may be chemically identical.
  • the invention is further characterized in that the fluids 20, 21 and 22 are liquid perfluoropolyethers having the following chemical formula: EndgroupA-O-(C3F6O)n-(CF2O)m-EndgroupB EndgroupA-O-(C2F4O)n-(CF2O)m-EndgroupB where EndgroupA and EndgroupB are mutually identical or different and are chosen between CF3 and CF 2 H.
  • Perfluoropolyethers are nonflammable, do not generate explosive gases, and are not toxic. These fluids can be chosen over a wide range of relative molecular masses and therefore of viscosities; from a fraction of one cSt to tens and hundreds of cSt, and can be hydrogenated or not at their endgroups.
  • the fluid 22, which is mainly meant to lubricate the kinematic systems of the selector 14, preferably has a viscosity of more than 1 cSt at room temperature.
  • the dielectric properties of perfluoropolyethers allow to simplify the construction and design of the transformer.
  • Dielectric liquids normally reduce their dielectric strength very significantly over long distances (more than 10 mm).
  • the insulating partitions 7 are usually interposed in the dielectric space between the high- and low-voltage windings 4 and 5 of the transformer, subdividing the distances in the liquid.
  • Perfluoropolyethers are non-toxic liquids which have no environmental impact; however, their decomposition products can include products which are toxic or have an impact on the environment, particularly on the greenhouse effect.
  • active filters 11 are used to adsorb and eliminate said toxic products.
  • the fluid 20 can decompose due to partial discharges or by heat, or can decompose due to an electric arc (in case of malfunction of the transformer, for example a short circuit), and therefore the filter is located preferably both in the gas collection device 19 and in the explosion-proof device 12.
  • the fluid 21 instead decomposes during normal diverters of the tap-changer 13 and therefore the filter 11 is located at the gas collection device 19 and/or at the expansion means 17.
  • the diverter switch 2 is provided with an expansion tank 17, as described above, which is filled with oxygen; therefore the liquid 21 is saturated with oxygen, which dissolves up to approximately 30% by volume at room temperature.
  • liquid perfluoropolyethers having the above described formula have, as mentioned, endgroups which can be CF 2 H (one or both) or CF 3 (no more than one).
  • endgroups which can be CF 2 H (one or both) or CF 3 (no more than one).
  • the presence of the CF 2 H endgroup is extremely important for environmental impact, since it causes the molecule to be reactive in the upper atmosphere and therefore does not contribute to the greenhouse effect.
  • liquid perfluoropolyether Another advantage arising from the use of liquid perfluoropolyether is the fact that these liquids are not subject to loss of their dielectric and arc-quenching properties due to their use as quenching media, i.e., they are not subject to aging as instead occurs for the mineral oil normally used as fluid in transformers.
  • the fluid 21 that is present in the diverter 2 or breaker chamber is always separated from the fluid 22 that is present in the selector, regardless of the position that the tap changer 13 assumes with respect to the tank 1 of the transformer.
  • the above cited active filters contain substances of the Jeffamine family.
  • the power and/or distribution transformer provided with on-load tap changer according to the invention fully achieves the intended aim and objects, since it can be nonflammable, non-explosive and compact, and furthermore, by way of the presence of suitable filters, free from any environmental impact.
  • the materials employed may be any according to the requirements and to the state of the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Transformer Cooling (AREA)
EP99201458A 1998-05-11 1999-05-11 Leistungs- und/oder Verteilungstransformator mit Lastumschalter Withdrawn EP0957496A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI981021 1998-05-11
ITMI981021 IT1299218B1 (it) 1998-05-11 1998-05-11 Trasformatore di potenza e/o di distribuzione dotato di commutatore sotto carico

Publications (2)

Publication Number Publication Date
EP0957496A2 true EP0957496A2 (de) 1999-11-17
EP0957496A3 EP0957496A3 (de) 2000-02-23

Family

ID=11379996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99201458A Withdrawn EP0957496A3 (de) 1998-05-11 1999-05-11 Leistungs- und/oder Verteilungstransformator mit Lastumschalter

Country Status (2)

Country Link
EP (1) EP0957496A3 (de)
IT (1) IT1299218B1 (de)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1113548A1 (de) * 1999-12-30 2001-07-04 ABB T&D Technologies Ltd. Elektrische Unterstation
EP1113549A1 (de) * 1999-12-30 2001-07-04 ABB T&D Technologies Ltd. Elektrische Unterstation
WO2007003595A1 (de) * 2005-07-01 2007-01-11 Siemens Aktiengesellschaft Elektrisches bauteil
WO2007009961A1 (de) * 2005-07-17 2007-01-25 Siemens Aktiengesellschaft Hermetisch abgeschlossener elektrischer apparat
WO2007149976A2 (en) * 2006-06-22 2007-12-27 Cooper Technologies Company Separate tanks for a power distribution transformer and a high voltage switch
US7661979B2 (en) 2007-06-01 2010-02-16 Cooper Technologies Company Jacket sleeve with grippable tabs for a cable connector
US7666012B2 (en) 2007-03-20 2010-02-23 Cooper Technologies Company Separable loadbreak connector for making or breaking an energized connection in a power distribution network
US7670162B2 (en) 2008-02-25 2010-03-02 Cooper Technologies Company Separable connector with interface undercut
US7695291B2 (en) 2007-10-31 2010-04-13 Cooper Technologies Company Fully insulated fuse test and ground device
US7811113B2 (en) 2008-03-12 2010-10-12 Cooper Technologies Company Electrical connector with fault closure lockout
US7842122B2 (en) * 2003-10-31 2010-11-30 Waukesha Electric Systems Incorporated Gas remover apparatus and method
US7854620B2 (en) 2007-02-20 2010-12-21 Cooper Technologies Company Shield housing for a separable connector
US7878849B2 (en) 2008-04-11 2011-02-01 Cooper Technologies Company Extender for a separable insulated connector
US7901227B2 (en) 2005-11-14 2011-03-08 Cooper Technologies Company Separable electrical connector with reduced risk of flashover
US7905735B2 (en) 2008-02-25 2011-03-15 Cooper Technologies Company Push-then-pull operation of a separable connector system
US7950940B2 (en) 2008-02-25 2011-05-31 Cooper Technologies Company Separable connector with reduced surface contact
US7950939B2 (en) 2007-02-22 2011-05-31 Cooper Technologies Company Medium voltage separable insulated energized break connector
US8056226B2 (en) 2008-02-25 2011-11-15 Cooper Technologies Company Method of manufacturing a dual interface separable insulated connector with overmolded faraday cage
US8109776B2 (en) 2008-02-27 2012-02-07 Cooper Technologies Company Two-material separable insulated connector
WO2012107816A1 (fr) 2011-02-08 2012-08-16 Philippe Magnier Llc Dispositif de prévention contre l'explosion d'un transformateur électrique muni d'un indicateur de liquide
DE102013100266A1 (de) * 2013-01-11 2014-07-17 Maschinenfabrik Reinhausen Gmbh Laststufenschalter
US20170288572A1 (en) * 2016-04-05 2017-10-05 Lsis Co., Ltd. Oil Type Phase Shift Transformer for Medium Voltage Inverter System

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7958631B2 (en) 2008-04-11 2011-06-14 Cooper Technologies Company Method of using an extender for a separable insulated connector

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2554514A1 (de) * 1975-12-04 1977-06-08 Transformatoren Union Ag Transformator fuer grosse elektrische leistungen
US4437082A (en) * 1982-07-12 1984-03-13 Westinghouse Electric Corp. Apparatus for continually upgrading transformer dielectric liquid
DE4215029A1 (de) * 1991-05-09 1992-11-12 Fuji Electric Co Ltd Nichtbrennbare isolationsfluessigkeit und stationaeres induktionsgeraet zur verwendung derselben

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2554514A1 (de) * 1975-12-04 1977-06-08 Transformatoren Union Ag Transformator fuer grosse elektrische leistungen
US4437082A (en) * 1982-07-12 1984-03-13 Westinghouse Electric Corp. Apparatus for continually upgrading transformer dielectric liquid
DE4215029A1 (de) * 1991-05-09 1992-11-12 Fuji Electric Co Ltd Nichtbrennbare isolationsfluessigkeit und stationaeres induktionsgeraet zur verwendung derselben

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1113549A1 (de) * 1999-12-30 2001-07-04 ABB T&D Technologies Ltd. Elektrische Unterstation
EP1113548A1 (de) * 1999-12-30 2001-07-04 ABB T&D Technologies Ltd. Elektrische Unterstation
US7842122B2 (en) * 2003-10-31 2010-11-30 Waukesha Electric Systems Incorporated Gas remover apparatus and method
CN101248497B (zh) * 2005-07-01 2012-03-21 西门子公司 电开关
WO2007003595A1 (de) * 2005-07-01 2007-01-11 Siemens Aktiengesellschaft Elektrisches bauteil
WO2007009961A1 (de) * 2005-07-17 2007-01-25 Siemens Aktiengesellschaft Hermetisch abgeschlossener elektrischer apparat
US7901227B2 (en) 2005-11-14 2011-03-08 Cooper Technologies Company Separable electrical connector with reduced risk of flashover
US8038457B2 (en) 2005-11-14 2011-10-18 Cooper Technologies Company Separable electrical connector with reduced risk of flashover
WO2007149976A2 (en) * 2006-06-22 2007-12-27 Cooper Technologies Company Separate tanks for a power distribution transformer and a high voltage switch
WO2007149976A3 (en) * 2006-06-22 2008-06-26 Cooper Technologies Co Separate tanks for a power distribution transformer and a high voltage switch
US7854620B2 (en) 2007-02-20 2010-12-21 Cooper Technologies Company Shield housing for a separable connector
US7950939B2 (en) 2007-02-22 2011-05-31 Cooper Technologies Company Medium voltage separable insulated energized break connector
US7666012B2 (en) 2007-03-20 2010-02-23 Cooper Technologies Company Separable loadbreak connector for making or breaking an energized connection in a power distribution network
US7862354B2 (en) 2007-03-20 2011-01-04 Cooper Technologies Company Separable loadbreak connector and system for reducing damage due to fault closure
US7661979B2 (en) 2007-06-01 2010-02-16 Cooper Technologies Company Jacket sleeve with grippable tabs for a cable connector
US7909635B2 (en) 2007-06-01 2011-03-22 Cooper Technologies Company Jacket sleeve with grippable tabs for a cable connector
US7695291B2 (en) 2007-10-31 2010-04-13 Cooper Technologies Company Fully insulated fuse test and ground device
US8056226B2 (en) 2008-02-25 2011-11-15 Cooper Technologies Company Method of manufacturing a dual interface separable insulated connector with overmolded faraday cage
US7950940B2 (en) 2008-02-25 2011-05-31 Cooper Technologies Company Separable connector with reduced surface contact
US7905735B2 (en) 2008-02-25 2011-03-15 Cooper Technologies Company Push-then-pull operation of a separable connector system
US7670162B2 (en) 2008-02-25 2010-03-02 Cooper Technologies Company Separable connector with interface undercut
US8109776B2 (en) 2008-02-27 2012-02-07 Cooper Technologies Company Two-material separable insulated connector
US8152547B2 (en) 2008-02-27 2012-04-10 Cooper Technologies Company Two-material separable insulated connector band
US7811113B2 (en) 2008-03-12 2010-10-12 Cooper Technologies Company Electrical connector with fault closure lockout
US7878849B2 (en) 2008-04-11 2011-02-01 Cooper Technologies Company Extender for a separable insulated connector
WO2012107816A1 (fr) 2011-02-08 2012-08-16 Philippe Magnier Llc Dispositif de prévention contre l'explosion d'un transformateur électrique muni d'un indicateur de liquide
DE102013100266A1 (de) * 2013-01-11 2014-07-17 Maschinenfabrik Reinhausen Gmbh Laststufenschalter
US20170288572A1 (en) * 2016-04-05 2017-10-05 Lsis Co., Ltd. Oil Type Phase Shift Transformer for Medium Voltage Inverter System
US10069437B2 (en) * 2016-04-05 2018-09-04 Lsis Co., Ltd. Oil type phase shift transformer for medium voltage inverter system

Also Published As

Publication number Publication date
EP0957496A3 (de) 2000-02-23
IT1299218B1 (it) 2000-02-29
ITMI981021A1 (it) 1999-11-11

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