EP3367399B1 - Hochspannungsanlage - Google Patents

Hochspannungsanlage Download PDF

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Publication number
EP3367399B1
EP3367399B1 EP17158498.0A EP17158498A EP3367399B1 EP 3367399 B1 EP3367399 B1 EP 3367399B1 EP 17158498 A EP17158498 A EP 17158498A EP 3367399 B1 EP3367399 B1 EP 3367399B1
Authority
EP
European Patent Office
Prior art keywords
conservator
high voltage
compartment
voltage assembly
compressible 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.)
Active
Application number
EP17158498.0A
Other languages
English (en)
French (fr)
Other versions
EP3367399A1 (de
Inventor
Tobias Stirl
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.)
General Electric Technology GmbH
Original Assignee
General Electric Technology GmbH
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 General Electric Technology GmbH filed Critical General Electric Technology GmbH
Priority to EP17158498.0A priority Critical patent/EP3367399B1/de
Priority to ES17158498T priority patent/ES2808276T3/es
Publication of EP3367399A1 publication Critical patent/EP3367399A1/de
Application granted granted Critical
Publication of EP3367399B1 publication Critical patent/EP3367399B1/de
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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
    • 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 present invention relates to a high voltage assembly.
  • Known high voltage assemblies like oil immersed power transformers or oil immersed reactors comprise a conservator which is adapted to receive an expansion volume of an insulation liquid.
  • the insulation liquid surrounds at least partly an active component in a compartment.
  • JP H10 149922 A discloses an oil-immersed electric apparatus
  • JP 2002 184625 a nitrogen-sealed oil-filled transformer
  • AT 96108 B showing an oil-immersed transformer with a laterally disposed expansion vessel.
  • a hermetically sealed high voltage assembly is defined in claim 1.
  • the high voltage assembly comprises: a hermetically sealed compartment delimited by rigid walls, wherein the compartment contains an active component at least partly surrounded by an insulation liquid; a hermetically sealed conservator delimited by rigid walls, wherein a level of insulation liquid inside the conservator is at or below a level of e.g. a cover of the compartment; and a liquid connection between the conservator and the compartment.
  • an area above the cover of the compartment can be used for other purposes or simply remains free.
  • the proposed high voltage assembly may be constructed to present a more compact design in the sense that single components can be arranged close together. Therefore, it is established a degree of freedom with regard to the location of the conservator.
  • a reception volume of the conservator is equal to or greater than one fifth, especially one quarter, and especially one third of a volume of the insulation liquid in the high voltage assembly.
  • the proposed volume of the conservator provides a sufficient fluid cushion for the expanding insulation liquid with a flexibility regarding the position of the conservator. This degree of freedom allows further components, for example the bushings, to be placed at a technically favorable position.
  • the dimensions of the high voltage assembly may increase but can be favorably adapted.
  • the proposed high voltage assembly can be equipped with an oil-to-air cooler or an oil-to-water cooler.
  • the hermetical seal of the high voltage assembly prevents ageing of the paper insulation as moisture and oxygen are kept away from the insulation liquid.
  • the conservator is partly filled with a compressible fluid in direct contact with the insulation liquid.
  • a compressible fluid in direct contact with the insulation liquid.
  • operating conditions of the compressible fluid comprise an absolute pressure of the compressible fluid between a lower pressure limit and an upper pressure limit. These operating conditions allow operating the conservator with under pressure of the compressible fluid and therefore provide a limit for the size of the conservator.
  • the conservator comprises a pressure relief valve which is adapted to discharge the compressible fluid to the environment if an absolute pressure of the compressible fluid rises above the upper pressure limit.
  • the conservator comprises an intake unit which is adapted to supply the conservator with the compressible fluid if an absolute pressure of the compressible fluid drops below the lower pressure limit. This ensures safe operation of the high voltage assembly by limiting the pressure of the compressible fluid.
  • the supplied fluid is dry air or nitrogen originating from a fluid reservoir.
  • the proposed supplied fluid advantageously does not negatively interfere with the insulation liquid.
  • the conservator is arranged besides the compartment.
  • this embodiment provides a favorable position for the conservator as an area above the cover is not used for the conservator.
  • the conservator can be arranged in direct neighborhood to the compartment.
  • a level of insulation liquid inside the conservator is above a level of the cover of the compartment.
  • the conservator is arranged above the compartment.
  • Figures 1 to 5 show schematically a hermetically sealed high voltage assembly, respectively.
  • FIG. 1 shows schematically a hermetically sealed high voltage assembly 2.
  • the high voltage assembly 2 can be a high voltage transformer, a high voltage reactor or a vacuum-type tap changer.
  • the high voltage assembly 2 comprises a hermetically sealed compartment 4 delimited by rigid walls, hermetically sealed conservator 6 and a liquid connection 8 connecting the conservator 6 with the compartment 4.
  • the liquid connection 8 serves to exchange insulation liquid 10 surrounding at least partly an active component 12 in the compartment 4.
  • the active component 12 comprises a core and windings.
  • Most of the insulation liquid 10 resides inside the compartment 4 and the conservator 6 is intended to receive an expansion volume of the insulation liquid 10 as the insulation liquid 10 is subject to temperature differences which results in changes of the volume of the insulation liquid 10.
  • the volume V4 of the compartment 4 is split into a number of five volume parts V4_1 to V4_5.
  • the volume V4 approximately reflects a volume of the whole insulation liquid 10 in the high voltage assembly 2 including the insulation liquid 10 residing in the conservator 6 and the liquid connection 8.
  • a reception volume V6 of the conservator 6 is equal or greater than one fifth especially one quarter, and especially one third of the volume V4 of the insulation liquid 10 in the whole high voltage assembly 2.
  • the reception volume V6 is an inner volume for receiving the insulation liquid 10 and a compressible fluid.
  • the reception volume V6 of the conservator 6 is smaller than one third of the volume V4 of the insulation liquid 10.
  • FIG. 2 shows schematically the hermetically sealed high voltage assembly 2 according to an embodiment.
  • the conservator 6 is partly filled with the compressible fluid 14.
  • the compressible fluid 14 provides a fluid cushion in the sense that when temperature of the insulation liquid 10 rises the insulation liquid 10 expands. This expansion of the insulation liquid 10 results in the insulation liquid 10 flowing from the compartment 4 to the conservator 6. Therefore, the volume of the compressible fluid 14 in the conservator 6 decreases and the pressure of the compressible fluid 14 increases.
  • the compressible fluid 14 is in direct contact with the insulation liquid 10.
  • Examples for the compressible fluid 14 are dried air or nitrogen.
  • the conservator 6 is partly filled with the compressible fluid 14.
  • the conservator 6 comprises a pressure relief valve 16 for discharging the compressible fluid 14 to the environment if an absolute pressure of the compressible fluid 14 rises above the upper pressure limit, for example 1.8 bar, especially above 1.6 bar, and especially above 1.5 bar. Furthermore, the conservator 6 comprises an intake unit 18 being adapted to supply the conservator 6 with fluid if an absolute pressure of the compressible fluid 14 drops below the lower pressure limit, for example 0.9 bar, especially below 0.8 bar, and especially below 0.6 bar.
  • the intake unit 18 comprises a valve 20 which is adapted to open a liquid connection between the conservator 6 and a fluid reservoir 22 if the absolute pressure of the compressible fluid 14 inside the conservator 6 drops below the lower pressure limit, for example 0.9 bar, especially below 0.8 bar, and especially below 0.6 bar.
  • the fluid reservoir 22 contains dry air or nitrogen with a pressure above the upper pressure limit, for example above 0.9 bar, especially above 0.8 bar, and especially above 0.6 bar.
  • a pressure sensor 24 determines a pressure P of the compressible fluid 14 in the conservator 6.
  • a level sensor 26 determines a level L of insulation liquid 10 inside the conservator 6.
  • a control unit 28 monitors the pressure P and/or the level L and determines a failure F in dependence on the pressure P and/or the level L.
  • the compartment 4 comprises a ground 30 and a cover 32.
  • a Buchholz relay 34 is arranged above a level L32 of the cover 32.
  • the conservator 6 is arranged besides the compartment 4.
  • the conservator 6 does not necessarily occupy an area 36 above the cover 32 of the compartment 4.
  • the level L of insulation liquid 10 inside the conservator 6 remains below the level L32 of the cover 32.
  • the conservator 6 and the compartment 4 share a joint wall 38.
  • the conservator 6 and the compartment 4 can be also embodied as separate containers.
  • An opening 40 of the liquid connection 8 is arranged at a lower part of the conservator 6 to inhibit compressible fluid 14 from flowing into the compartment 4.
  • An opening 42 of the liquid connection 8 is arranged at a lower part of the compartment 4. In another embodiment the opening 42 is arranged at the middle or upper part of the compartment 4.
  • Figure 3 is shows schematically an embodiment of the high voltage assembly 2. With difference to figure 2 the conservator 6 is arranged inside the compartment 4.
  • Figure 4 shows schematically an example of the high voltage assembly 2. With difference to figure 2 the conservator 6 is arranged above the compartment 4.
  • Figure 5 shows schematically an embodiment of the high voltage assembly 2. With difference to figure 2 the conservator 6 is arranged below the compartment 4.
  • All embodiments of the high voltage assembly 2 comprise a joint wall 38 shared between the conservator 6 and the compartment 4.
  • the conservator 6 can be also arranged separately inside or outside the compartment 4 without having such a joint wall 38.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transformer Cooling (AREA)

Claims (9)

  1. Hermetisch abgedichtete Hochspannungsbaugruppe (2), umfassend:
    - ein hermetisch abgedichtetes Fach (4), das von starren Wänden begrenzt wird, wobei das Fach (4) ein aktives Bauteil (12) enthält, das mindestens teilweise von einer Isolierflüssigkeit (10) umgeben ist;
    - einen hermetisch abgedichteten Behälter (6), der von starren Wänden begrenzt wird, wobei sich ein Niveau (L) von Isolierflüssigkeit (10) innerhalb des Behälters (6) auf oder unter einem Niveau (L32) einer Abdeckung (32) des Fachs (4) befindet; und
    - eine Flüssigkeitsverbindung (8) zwischen dem Behälter (6) und dem Fach (4),
    wobei der Behälter (6) teilweise mit einem komprimierbaren Fluid (14) gefüllt ist, dass mit der Isolierflüssigkeit (10) in direktem Kontakt steht, wobei die Hochspannungsbaugruppe so angepasst ist, dass Betriebsbedingungen des komprimierbaren Fluids (14) einen Absolutdruck des komprimierbaren Fluids (14) zwischen einer unteren Druckgrenze und einer oberen Druckgrenze umfassen, und dadurch, dass der Behälter (6) eine Einlasseinheit (18) umfasst, die dazu geeignet ist, den Behälter (6) mit dem komprimierbaren Fluid zu versorgen, wenn ein Absolutdruck des komprimierbaren Fluids (14) unter die untere Druckgrenze sinkt.
  2. Hochspannungsbaugruppe (2) nach Anspruch 1, wobei ein Aufnahmevolumen (V6) des Behälters (6) gleich oder größer als ein Fünftel, insbesondere ein Viertel, und insbesondere ein Drittel eines Volumens (V4) der Isolierflüssigkeit (10) in der Hochspannungsbaugruppe (2) ist.
  3. Hochspannungsbaugruppe (2) nach einem der vorstehenden Ansprüche, wobei das Fach (4) und der Behälter (6) eine gemeinsame Wand (38) aufweisen.
  4. Hochspannungsbaugruppe (2) nach einem der vorstehenden Ansprüche, wobei der Behälter (6) ein Druckentlastungsventil (16) umfasst, das dazu geeignet ist, das komprimierbare Fluid (14) in die Umwelt abzulassen, wenn ein Absolutdruck des komprimierbaren Fluids (14) über die obere Druckgrenze steigt.
  5. Hochspannungsbaugruppe (2) nach Anspruch 1, wobei es sich bei dem komprimierbaren Fluid um trockene Luft oder Stickstoff handelt, die aus einem Fluidreservoir (22) stammen.
  6. Hochspannungsbaugruppe (2) nach einem der vorstehenden Ansprüche, wobei der Behälter (6) neben dem Fach (4) angeordnet ist.
  7. Hochspannungsbaugruppe (2) nach den Ansprüchen 1 bis 5, wobei der Behälter (6) innerhalb des Fachs (4) angeordnet ist.
  8. Hochspannungsbaugruppe (2) nach den Ansprüchen 1 bis 5, wobei der Behälter (6) unter dem Fach (4) angeordnet ist.
  9. Hochspannungsbaugruppe (2) nach einem der vorstehenden Ansprüche, wobei die untere Druckgrenze 0,9 x 105 Pa (0,9 Bar) beträgt, und die obere Druckgrenze 1,8 x 105 Pa (1,8 Bar) beträgt.
EP17158498.0A 2017-02-28 2017-02-28 Hochspannungsanlage Active EP3367399B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP17158498.0A EP3367399B1 (de) 2017-02-28 2017-02-28 Hochspannungsanlage
ES17158498T ES2808276T3 (es) 2017-02-28 2017-02-28 Conjunto de alta tensión

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17158498.0A EP3367399B1 (de) 2017-02-28 2017-02-28 Hochspannungsanlage

Publications (2)

Publication Number Publication Date
EP3367399A1 EP3367399A1 (de) 2018-08-29
EP3367399B1 true EP3367399B1 (de) 2020-07-08

Family

ID=58266842

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17158498.0A Active EP3367399B1 (de) 2017-02-28 2017-02-28 Hochspannungsanlage

Country Status (2)

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EP (1) EP3367399B1 (de)
ES (1) ES2808276T3 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3964803A1 (de) * 2020-09-04 2022-03-09 Siemens Gamesa Renewable Energy A/S Fehlergaserkennungssystem für einen flüssigkeitsgefüllten hochspannungstransformator

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT96108B (de) 1922-03-02 1924-02-25 Janka A Spol Spolecnost S R O Öltransformator mit seitlich angeordnetem Ausdehnungsgefäß.
GB199535A (en) * 1922-04-12 1923-06-28 Gen Electric Improvements in and relating to oil-cooled x-ray apparatus
GB322534A (en) * 1928-09-08 1929-12-09 John Bentley Hansell Improvements in or relating to oil tanks for oil-immersed electrical apparatus such as transformers
JPH0378216A (ja) * 1989-08-21 1991-04-03 Daihen Corp 油入変圧器
JPH10149922A (ja) * 1996-11-19 1998-06-02 Toshiba Fa Syst Eng Kk 油入電気機器
JP2002184625A (ja) * 2000-12-15 2002-06-28 Daihen Corp 窒素密封形油入式変圧器
WO2007009961A1 (de) * 2005-07-17 2007-01-25 Siemens Aktiengesellschaft Hermetisch abgeschlossener elektrischer apparat
PL2110822T3 (pl) * 2008-04-15 2010-12-31 Gatron Gmbh Sposób redukowania doprowadzania powietrza z atmosfery do wnętrza zbiornika wyrównawczego urządzenia wysokonapięciowego wypełnionego cieczą izolacyjną oraz urządzenie dla realizowania takiego sposobu

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3367399A1 (de) 2018-08-29
ES2808276T3 (es) 2021-02-26

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