EP1253389B1 - Procédé de séchage d'une pièce active, et dispositif pour la mise en oeuvre de ce procédé - Google Patents

Procédé de séchage d'une pièce active, et dispositif pour la mise en oeuvre de ce procédé Download PDF

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Publication number
EP1253389B1
EP1253389B1 EP20020405256 EP02405256A EP1253389B1 EP 1253389 B1 EP1253389 B1 EP 1253389B1 EP 20020405256 EP20020405256 EP 20020405256 EP 02405256 A EP02405256 A EP 02405256A EP 1253389 B1 EP1253389 B1 EP 1253389B1
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EP
European Patent Office
Prior art keywords
oil
active part
housing
pressure
winding
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
EP20020405256
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German (de)
English (en)
Other versions
EP1253389A1 (fr
Inventor
Paul Gmeiner
Peter Keller
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 Schweiz AG
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ABB Schweiz AG
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Filing date
Publication date
Application filed by ABB Schweiz AG filed Critical ABB Schweiz AG
Priority to EP20020405256 priority Critical patent/EP1253389B1/fr
Publication of EP1253389A1 publication Critical patent/EP1253389A1/fr
Application granted granted Critical
Publication of EP1253389B1 publication Critical patent/EP1253389B1/fr
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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/353—Resistance heating, e.g. using the materials or objects to be dried as an electrical resistance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/005—Drying solid materials or objects by processes not involving the application of heat by dipping them into or mixing them with a chemical liquid, e.g. organic; chemical, e.g. organic, dewatering aids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum

Definitions

  • the invention is based on a method and a device for drying at least one winding and solid insulation containing active part according to the preambles of claims 1 and 8.
  • Bei the implementation of the method is the active part in a vacuum-tight housing
  • the device is arranged and sprayed by spraying oil in the housing and by a guided in the at least one winding current to a through the Temperature of the winding heated specific temperature. At a compared to atmosphere reduced pressure is the heated active part of water withdrawn.
  • the described method are in a Vacuum-resistant housing the windings of a transformer with electricity and parallel to this by spraying heated oil to a set temperature heated and dried.
  • the oil is first at atmospheric pressure and then - in a variant of the method - at gradually reducing pressure sprayed.
  • By lowering the pressure to typically 200 mbar is the Degassing and drainage of the windings improved.
  • the active part is first through one of the LFH - plant heated low-frequency electricity and heated by transformer oil, wherein the oil is heated and circulated through the oil treatment plant.
  • the active part heated to a predetermined target temperature, so will hot transformer oil removed from the transformer housing and the pressure in the transformer housing taking into account the Paschen law reduced to atmospheric pressure.
  • intensive evaporation of existing in the solid insulation of the active part Water This will depend on the pressure inside the Transformer housing and the height of the temperature of the upper and / or the Undervoltage winding changes the size of the current, so a gentle Reheating and thus a permanent evaporation of the water from the To achieve isolation.
  • the object is to provide a method of the type mentioned, which is a rapid and particularly gentle drying, as well as an easy to to provide implementing device for performing this method.
  • the pressure in the housing is reduced to a working value which is greater than one by the Paschen für Float certain pressure setpoint and less than one opposite Atmospheric pressure a high evaporation rate of water from the active part ensuring upper pressure limit.
  • the oil contributes to the labor value powered stream in the housing, and is sprayed during the spraying of the oil, collecting the sprayed oil on the caseback as well Reheating and re-spraying the collected oil Temperature of the winding kept greater than the temperature of the oil.
  • the Active part is thus already dried intensively at the beginning of the heating process. It is at this time in a virtually oil-free, evacuated housing, by spraying the previously heated oil and by LFH heating is heated effectively. The process is therefore particularly fast.
  • An effective control of the drying process according to the invention is possible if during the heating of the active part per unit time from the Active part passing amount of water, for example by measuring the Water vapor partial pressure in the housing, is detected, and if below a Maximums of the amount of water exiting per unit time Winding temperature, especially by oil spray, is kept constant. at switched off current can then be the reduced pressure below the pressure setpoint lowered and then dried very effectively and energy-saving become.
  • the quality of the drying can be further increased, if after the Oil spray the oil removed from the housing at reduced pressure and the Winding temperature is kept constant by heating with electricity. By Periodic lowering of the reduced pressure with the power off under the Pressure setpoint can then even small amounts of water from the active part be removed.
  • a suitable device for drying the active part according to claim 8 contains in addition to a Active part receiving vacuum-tight housing, one in the bottom of the housing provided drain, an oil inlet and a via an oil pump with the drain and connected via a pipe with the oil inlet Oil treatment plant also at least one in the ceiling of the housing arranged sprayer and one in the oil treatment plant envisaged oil heater with an output that goes through the pipe and the Oil inlet is connected to the spray device.
  • the oil is so from the top of the Active part sprayed on and can then on a relatively long flow path a lot of heat submit.
  • the spray device being distributed over the ceiling several Having on the active part aligned spray nozzles, which advantageously are formed adjustable, the oil can be selectively sprayed and so the Efficiency of the device can be additionally increased.
  • FIG. 1 for carrying out the inventive Method 1 denotes a vacuum-tight housing which does not have a designated valve assembly with a vacuum system 2 is connectable.
  • the Housing takes an active part 3 of an electrical device, such as a Transformers, on. Is the transformer oil filled, then that can Transformer housing serve as housing 1.
  • the case can also be any other vacuum tight, temperature resistant container with vacuum-sealed electrical feedthroughs and can instead of a large active part also record several small active parts.
  • the active part 3 contains at least one winding and the winding insulating hygroscopic solid insulation.
  • the apparent from Fig.1 active part contains in addition, an iron core 4 and three each one phase of a three-phase Current associated coil blocks 5, which each have a top and a Have undervoltage winding.
  • the low voltage windings 6 are shorted outside the housing, whereas the High-voltage windings 7 with the current output one outside the Housing 1 arranged low-frequency AC or DC generating LFH - system 8 are connected.
  • a drain 9 is provided by the on Caseback collected oil 10 by means of an oil pump 11 in a Oil heater 12 an oil treatment plant 13 can be deducted.
  • an oil inlet 14 With a in the ceiling of the Housing 1 arranged spraying device 15 is connected.
  • These Spray device has a plurality of spray nozzles 16 distributed over the ceiling, which are aligned to the active part. At least some of the spray nozzles 16 can also be arranged on the side walls of the housing 1. Thereby and by adjustably aligned spray nozzles, the active part 3 targeted and not be sprayed only from above, but also from the side.
  • the pressure p is first reduced with the vacuum system 2.
  • the working value of the reduced pressure used in carrying out the method should be greater than a pressure setpoint p pasch specified by the Paschen law . Below this pressure setpoint, it could happen due to the Paschen law when in an electric field to rollovers. When applying a heating voltage to the active part then electrical discharges could occur, which could lead to an impairment of the insulating capacity of the active part.
  • the working value of the reduced pressure should also be as small as possible in order to have a high evaporation rate for the water to be removed from the active part. The working value is below 100 mbar, typically at 10 to 30 mbar.
  • the pressure is sufficiently reduced.
  • the active part is then heated with a low-frequency alternating current I passed through the high-voltage windings 7 and with an induced current induced in the low-voltage windings 6.
  • heated oil is conducted to the spraying device 15 in the oil preparation plant 13 and sprayed onto the surface of the active part 3 from there.
  • the combined heating with electricity and with oil ensures that the heat required to dry the active part is supplied simultaneously from the inside and the outside.
  • the winding temperature Tw is based on a mean value calculated in a known manner from the temperatures of the upper and lower voltage windings (cf., for example, the cited state of the art according to W. Müntener). The corresponding temperature curves are also entered in FIG. As can be seen, T w is always kept slightly larger than T oil during the drying process. It is thus ensured that the water present in the active part 3 is guided from the inside to the outside. The evaporated water is sucked off via the vacuum system 2.
  • the winding temperature T w1 is already relatively large and is no longer very far (for example, 10 or 20 ° C) below an allowable temperature end value T end, for example, 110 ° C. Since at this temperature P H2O a maximum of the amount of water delivered per unit time is exceeded, the winding temperature T w is kept constant at T w1 at this time.
  • the oil temperature is kept constant. The constant can be effected mainly by oil spray.
  • T w is always above T oil and diffuses the water in the active part from the inside to the outside, and then there on the other during a pause of power p under pressure lowered the pressure setpoint T Pasch and the outwardly guided water can be better evaporated from the active part.
  • the final temperature T end is reached and the heating is set by oil spray. Power heating keeps the active part at the final temperature.
  • the oil 10 is now completely withdrawn from the housing 1. With the removal of the oil at the same time also by the oil from the active part rinsed impurities are removed from the housing.
  • the oil is removed. It can now be removed in a subsequent fine vacuum phase by intermittent heating and pressure lowering remaining water from the active part. Finally, with the electrical heating switched off, the housing can then be ventilated and the dried active part removed or fresh oil filled into the housing.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Microbiology (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biomedical Technology (AREA)
  • Biotechnology (AREA)
  • Drying Of Solid Materials (AREA)

Claims (10)

  1. Procédé de séchage d'une pièce active (3) contenant au moins un enroulement (6, 7) et des isolations en matière solide dans un boítier étanche au vide (1), dans lequel la pièce active est chauffée par pulvérisation d'huile chauffée (10) dans le boítier (1) et par un courant (I) guidé dans l'au moins un enroulement à une valeur finale de température (Tend) et de l'eau est extraite de la pièce active (3) à une pression (p) réduite par rapport à l'atmosphère, caractérisé en ce que
    la pression (p) dans le boítier est réduite à une valeur de travail avant la pulvérisation de l'huile chauffée, laquelle valeur de travail est supérieure à une valeur de consigne de pression (ppasch) déterminée selon la loi de Paschen et est inférieure à une valeur limite de pression supérieure assurant par rapport à la pression atmosphérique une haute vitesse d'évaporation de l'eau hors de la pièce active,
    en ce que l'huile est pulvérisée dans le boítier (10) à la valeur de travail lorsqu'un courant (I) est enclenché, et
    en ce que pendant la pulvérisation de l'huile (10), la collecte de l'huile pulvérisée au fond du boítier ainsi que le réchauffement et la pulvérisation supplémentaire de l'huile collectée (10) à la pression de travail et avec un courant (I) enclenché, la température (Tw) de l'enroulement est maintenue plus élevée que la température (Toil) de l'huile.
  2. Procédé selon la revendication 1, caractérisé en ce que pendant la pulvérisation de l'huile et le chauffage de l'enroulement avec du courant, la pression réduite dans le boítier est maintenue au dessus d'une valeur de consigne de pression (ppasch) déterminée par la loi de Paschen.
  3. Procédé selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que pendant le chauffage de la pièce active, la quantité d'eau (pH2O) sortant par unité de temps hors de la pièce active (3) est détectée, et en ce qu'en dessous d'un maximum de quantité d'eau sortant par unité de temps, la température (Tw) de l'enroulement chauffé par le courant est maintenue constante.
  4. Procédé selon la revendication 3, caractérisé en ce que pour une température d'enroulement constante (Tw1) et pour un courant (I) coupé, la pression réduite (p) est abaissée sous la valeur de consigne de pression (ppasch).
  5. Procédé selon la revendication 4, caractérisé en ce qu'en dessous d'une valeur limite de la quantité d'eau formée par unité de temps, la pression est augmentée à une valeur située au-dessus de la valeur de consigne de pression et ensuite la température d'enroulement (Tw) est successivement augmentée à la valeur finale de température (Tend).
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'après la pulvérisation de l'huile (t4), l'huile est extraite du boítier à pression réduite et la température d'enroulement est dans ce cas maintenue constante par chauffage avec un courant.
  7. Procédé selon la revendication 6, caractérisé en ce qu'après l'extraction de l'huile (t5), la pression réduite, avec un courant coupé, est abaissée périodiquement sous la valeur de consigne de pression (ppasch).
  8. Dispositif pour la mise en oeuvre du procédé selon l'une quelconque des revendications 1 à 7, contenant un boítier (1) étanche au vide recevant la pièce active (3), une évacuation (9) prévue dans le fond du boítier (1), une entrée d'huile (14) et une installation de fourniture d'huile (13) connectée par le biais d'une pompe de refoulement en huile (11) à l'évacuation (9) et par le biais d'une conduite à l'entrée d'huile (14), caractérisé en ce que dans le couvercle du boítier (1) est disposé au moins un dispositif de pulvérisation (15), et en ce que l'installation de fourniture d'huile (13) contient un dispositif de chauffage d'huile (12) avec une sortie, lequel est connecté par le biais de la conduite et de l'entrée d'huile (14) au dispositif de pulvérisation (15).
  9. Dispositif selon la revendication 8, caractérisé en ce que le dispositif de pulvérisation (15) présente plusieurs buses de pulvérisation (16) réparties sur le couvercle et orientées sur la pièce active (3).
  10. Dispositif selon la revendication 9, caractérisé en ce que les buses de pulvérisation sont réalisées de manière réglable.
EP20020405256 2001-04-24 2002-04-02 Procédé de séchage d'une pièce active, et dispositif pour la mise en oeuvre de ce procédé Expired - Lifetime EP1253389B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20020405256 EP1253389B1 (fr) 2001-04-24 2002-04-02 Procédé de séchage d'une pièce active, et dispositif pour la mise en oeuvre de ce procédé

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP01810399 2001-04-24
EP01810399 2001-04-24
EP20020405256 EP1253389B1 (fr) 2001-04-24 2002-04-02 Procédé de séchage d'une pièce active, et dispositif pour la mise en oeuvre de ce procédé

Publications (2)

Publication Number Publication Date
EP1253389A1 EP1253389A1 (fr) 2002-10-30
EP1253389B1 true EP1253389B1 (fr) 2005-11-16

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1528342B1 (fr) * 2003-10-31 2006-08-30 Paul Gmeiner Procédé pour séchage de matériau et dispositif pour mettre en oeuvre le procédé
BR112012001895A2 (pt) * 2009-07-29 2016-03-15 Siemens Ag método para reduzir a umidade de um enrolamento revestido com isolamento, e um dispositivo de pulverização para reduzir a umidade
CN102064018A (zh) * 2010-11-24 2011-05-18 河南省电力公司南阳供电公司 变压器检修作业防潮装置
CN102980377A (zh) * 2012-12-06 2013-03-20 云南铜业科技发展股份有限公司 一种真空干燥富硒渣的方法
EP3029403B1 (fr) * 2014-12-03 2017-12-20 Paul Gmeiner Procédé et dispositif de séchage de l'isolation de matière solide de la pièce active d'un appareil électrique selon le procédé de phase gazeuse
CN114353437B (zh) * 2022-01-05 2022-11-22 浙江工业大学 一种控制腌腊鱼欧姆加热干燥过程的方法及装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56107548A (en) * 1980-01-31 1981-08-26 Toshiba Corp Drying and oil immersing device for insulator
DE3715235A1 (de) * 1987-05-07 1988-11-24 Micafil Ag Verfahren und vorrichtung zum extrahieren von oel oder polychloriertem biphenyl aus impraegnierten elektrischen teilen mittels eines loesungsmittels sowie zur destillation des loesungsmittels
DE59209252D1 (de) * 1991-11-18 1998-04-30 Micafil Vakuumtechnik Ag Verfahren zur Trocknung der Feststoffisolationen von Transformatoren,insbesondere für Verteileranlagen, und Vorrichtung zur Durchführung dieses Verfahrens
DE19501323C2 (de) * 1995-01-19 2003-10-09 Micafil Ag Zuerich Verfahren zur Trocknung der Feststoffisolationen eines in einer elektrischen Anlage angeordneten Transformators
DE19637313C5 (de) * 1995-09-16 2007-12-27 Wilhelm Hedrich Vakuumanlagen Gmbh & Co. Kg Vorrichtung zum Aufheizen von Teilen
DE50115174D1 (de) * 2000-09-05 2009-11-26 Hedrich Vakuumanlagen Wilhelm Vorrichtung zur aufbereitung von transformatoren

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