EP1253389A1 - 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
EP1253389A1
EP1253389A1 EP02405256A EP02405256A EP1253389A1 EP 1253389 A1 EP1253389 A1 EP 1253389A1 EP 02405256 A EP02405256 A EP 02405256A EP 02405256 A EP02405256 A EP 02405256A EP 1253389 A1 EP1253389 A1 EP 1253389A1
Authority
EP
European Patent Office
Prior art keywords
oil
pressure
active part
housing
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.)
Granted
Application number
EP02405256A
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German (de)
English (en)
Other versions
EP1253389B1 (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
Original Assignee
Micafil AG
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 Micafil AG filed Critical Micafil 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
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
    • 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 for drying a active part containing at least one winding and solid insulation the preamble of claim 1.
  • the active part in one vacuum-proof housing and is arranged by spraying oil in the housing and through a current carried in the at least one winding onto one the temperature of the winding heated certain final temperature. at the heated active part becomes at a reduced pressure compared to the atmosphere Deprived of water.
  • the active part is first dried by one from the LFH system supplied low-frequency electricity and heated by transformer oil, whereby the oil is heated and circulated through the oil treatment plant.
  • the active part If the active part is heated to a predetermined target temperature, it will hot transformer oil removed from the transformer housing and the pressure in the transformer housing taking into account the Paschen law reduced compared to atmospheric pressure. A occurs during the pressure reduction intensive evaporation of the solid insulation of the active part Water.
  • the level of the temperature of the top and / or Undervoltage winding changes the size of the current, so a gentle one Reheat and thus permanent evaporation of the water from the To achieve isolation.
  • the object of the invention is as set out in the claims to create a method of the type mentioned, which a allows quick and particularly gentle drying, as well as easy to specify implementing device for performing this method.
  • the pressure in the housing is reduced to a work value which is greater than one pressure setpoint determined by the Paschen law and less than one opposite Atmospheric pressure a high evaporation rate of the water from the active part ensuring upper pressure limit.
  • the oil will contribute to the labor value switched on current is sprayed in the housing, and is during the spraying the oil, collecting the sprayed oil on the housing base and Reheating and spraying the collected oil again Temperature of the winding kept higher than the temperature of the oil.
  • the active part is intensively dried at the start of the heating process. It is currently in a practically oil-free, evacuated housing, by spraying the previously heated oil and by LFH heating is effectively heated. The process is therefore particularly quick.
  • the Energy consumption is comparatively low and the method according to the invention can be carried out in a very economical manner. Most of all because Because of the small amount of oil, the preparation and heating of the oil executing plant can be kept small.
  • Effective control of the drying process according to the invention is possible if during the heating up of the active part the per time unit from the Active part emerging amount of water, for example by measuring the Water vapor partial pressure in the housing, is detected, and if below one Maximum of the amount of water escaping per unit of time Winding temperature, especially by spraying oil, is kept constant. at switched off current can then the reduced pressure below the pressure setpoint lowered and then dried in a particularly effective and energy-saving manner become. To improve the degree of dryness, it is recommended to put the pressure on raise a value above the pressure setpoint and the Gradually increase the winding temperature to a final temperature value as soon as the amount of water generated per unit of time has fallen below a limit.
  • the quality of the drying can be increased if after Oil spray removes the oil from the housing at reduced pressure and the Winding temperature is kept constant by heating with electricity. By periodically lowering the reduced pressure with the current switched off below the The pressure setpoint can then also contain small amounts of water from the active part be removed.
  • a suitable device for carrying out the method according to the invention has an oil treatment system for removing the on the housing base collected oil, for heating the extracted oil and for supplying the collected oil and one arranged in the ceiling of the housing Spray device, which with a heated oil from the processing plant supply line is connected.
  • the oil is thus from the top of the active part sprayed on and can then heat a lot on a relatively long flow path submit.
  • a vacuum-tight housing which does not have a designated valve assembly can be connected to a vacuum system 2.
  • the Housing takes an active part 3 of an electrical device, such as one Transformer, on. If the transformer is filled with oil, it can Serve transformer housing as housing 1.
  • the housing can also any other vacuum tight, temperature resistant container will be with vacuum-tight current feedthroughs and can replace a large active part also accommodate several small active parts.
  • the active part 3 contains at least one winding and the winding insulating hygroscopic solid insulation.
  • the active part shown in Fig.1 contains in addition, an iron core 4 and three each one phase of a three-phase Current-associated coil blocks 5, each having an upper and a Have undervoltage winding.
  • the undervoltage windings 6 are short-circuited outside the housing, whereas the High-voltage windings 7 with the current output outside the Housing 1 arranged low-frequency alternating current or direct current generating LFH system 8 are connected.
  • a drain 9 is provided through which Oil 10 collected in the housing bottom with the help of an oil pump 11 in a Oil heater 12 of an oil treatment plant 13 can be removed.
  • the Output of the oil heater 12 is via an oil inlet 14 with a in the ceiling of the Housing 1 arranged spray device 15 connected.
  • This Spray device has a plurality of spray nozzles 16 distributed over the ceiling, which are aimed at 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 means of adjustable spray nozzles, the active part 3 can be 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, due to the Paschen law, flashovers could occur in an electric field. When a heating voltage is applied to the active part, electrical discharges could then occur, which could impair the insulation 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 10 to 30 mbar.
  • the pressure is reduced sufficiently.
  • the active part is now heated with a low-frequency alternating current I conducted through the high-voltage windings 7 and with an induction current caused in the undervoltage windings 6.
  • heated oil is led in the oil treatment system 13 to the spray device 15 and sprayed from there onto the surface of the active part 3.
  • the combined heating with electricity and oil ensures that the heat required to dry the active part is supplied simultaneously from the inside and outside.
  • the winding temperature Tw is based on a mean value which is calculated in a known manner from the temperatures of the upper and lower voltage winding (see, for example, the prior art cited at the outset according to W. Müntener). The corresponding temperature curves are also entered in FIG. 2.
  • T w is always kept slightly larger than T oil . This ensures that the water present in the active part 3 is led 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 high and is no longer very far (for example 10 or 20 ° C.) below a permissible final temperature value T end of, for example, 110 ° C. Since at this temperature p H2O a maximum of the amount of water dispensed per unit of time is exceeded, the winding temperature T w is kept constant at T w1 at this time.
  • the oil temperature is also kept constant. Maintaining constant can mainly be achieved by spraying oil.
  • the oil is removed.
  • residual water can now be removed from the active part by intermittent heating and pressure reduction.
  • the housing can be ventilated and the dried active part removed or fresh oil filled into the housing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Microbiology (AREA)
  • Biomedical Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Biotechnology (AREA)
  • Drying Of Solid Materials (AREA)
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 true EP1253389A1 (fr) 2002-10-30
EP1253389B1 EP1253389B1 (fr) 2005-11-16

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EP20020405256 Expired - Lifetime 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

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EP (1) EP1253389B1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1528342A3 (fr) * 2003-10-31 2005-07-20 Paul Gmeiner Procédé pour séchage de matériau et dispositif pour mettre en oeuvre le procédé
WO2011012149A1 (fr) * 2009-07-29 2011-02-03 Siemens Aktiengesellschaft Procédé de réduction de l'humidité d'un enroulement revêtu d'isolant ainsi qu'un dispositif de pulvérisation pour la réduction de l'humidité
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
EP3029403A1 (fr) * 2014-12-03 2016-06-08 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
CN114353437A (zh) * 2022-01-05 2022-04-15 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

Citations (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
US5424513A (en) * 1991-11-18 1995-06-13 Micafil Ag Method for producing transformers, especially transformers for distribution systems, and a device for carrying out this method
DE19501323A1 (de) * 1995-01-19 1996-07-25 Micafil Vakuumtechnik Ag Verfahren zur Trocknung der Feststoffisolationen eines in einer elektrischen Anlage angeordneten Transformators
DE19637313A1 (de) * 1995-09-16 1997-03-27 Hedrich Vakuumanlagen Wilhelm Vorrichtung zum Aufheizen von Teilen
WO2002020113A1 (fr) * 2000-09-05 2002-03-14 Wilhelm Hedrich Vakuumanlagen Gmbh & Co. Kg Dispositif pour le traitement de transformateurs

Patent Citations (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
US5424513A (en) * 1991-11-18 1995-06-13 Micafil Ag Method for producing transformers, especially transformers for distribution systems, and a device for carrying out this method
DE19501323A1 (de) * 1995-01-19 1996-07-25 Micafil Vakuumtechnik Ag Verfahren zur Trocknung der Feststoffisolationen eines in einer elektrischen Anlage angeordneten Transformators
DE19637313A1 (de) * 1995-09-16 1997-03-27 Hedrich Vakuumanlagen Wilhelm Vorrichtung zum Aufheizen von Teilen
WO2002020113A1 (fr) * 2000-09-05 2002-03-14 Wilhelm Hedrich Vakuumanlagen Gmbh & Co. Kg Dispositif pour le traitement de transformateurs

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 005, no. 179 (E - 082) 17 November 1981 (1981-11-17) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1528342A3 (fr) * 2003-10-31 2005-07-20 Paul Gmeiner Procédé pour séchage de matériau et dispositif pour mettre en oeuvre le procédé
WO2011012149A1 (fr) * 2009-07-29 2011-02-03 Siemens Aktiengesellschaft Procédé de réduction de l'humidité d'un enroulement revêtu d'isolant ainsi qu'un dispositif de pulvérisation pour la réduction de l'humidité
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
EP3029403A1 (fr) * 2014-12-03 2016-06-08 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
CN114353437A (zh) * 2022-01-05 2022-04-15 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
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

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Publication number Publication date
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