EP0801405B1 - Verfahren zur Vortrocknung eines mindestens eine Wicklung und Feststoffisolationen enthaltenden Spulenblocks und Vorrichtungen zur Durchführung dieses Verfahrens - Google Patents

Verfahren zur Vortrocknung eines mindestens eine Wicklung und Feststoffisolationen enthaltenden Spulenblocks und Vorrichtungen zur Durchführung dieses Verfahrens Download PDF

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Publication number
EP0801405B1
EP0801405B1 EP19970810170 EP97810170A EP0801405B1 EP 0801405 B1 EP0801405 B1 EP 0801405B1 EP 19970810170 EP19970810170 EP 19970810170 EP 97810170 A EP97810170 A EP 97810170A EP 0801405 B1 EP0801405 B1 EP 0801405B1
Authority
EP
European Patent Office
Prior art keywords
winding
heating
air
heated
housing
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
EP19970810170
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German (de)
English (en)
French (fr)
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EP0801405A3 (enrdf_load_stackoverflow
EP0801405A2 (de
Inventor
Paul Gmeiner
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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Publication date
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Publication of EP0801405A2 publication Critical patent/EP0801405A2/de
Publication of EP0801405A3 publication Critical patent/EP0801405A3/xx
Application granted granted 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 invention also relates to devices for predrying of the coil block according to the common preamble of claims 9 and 11.
  • the generic predrying method the at least one Winding under reduced pressure in a gas-tight housing heated with electricity.
  • Such a method and the devices used to carry it out are generally used to stabilize the coil block prior to installation in an electrical machine or apparatus, such as a transformer.
  • the method can also be used to match the geometrical dimensions of the coil block to parts of the machine or apparatus which support the coil block and which support it for receiving short circuit forces.
  • JP 5006833 A A method of the type mentioned is described in JP 5006833 A.
  • a winding of a coil block under vacuum in a drying oven with direct current heated Moisture passing from the heated coil block is removed from inside the drying oven by means of a vacuum device.
  • a temperature controller based on a thermocouple maintains the temperature of the coil block within an optimum range for rapid and effective predrying of the coil block.
  • the object of the invention to provide a method of the type mentioned, which allows a particularly gentle removal of moisture, and which can still be performed very quickly and energy-saving, and to provide devices with which this procedure can be carried out.
  • the inventive method and the inventive devices are characterized in that the parts of the solid insulation, which - as in particular the barrier insulation - not directly in contact with the upstream heated winding, now not only by heat conduction but also by convection and heat radiation are heated. Therefore, the coil block is heated particularly evenly and the moisture present in the solid insulation is removed very gently.
  • the circulating in the gas-tight housing air is heated only to a lower temperature than the temperature of the coil block. Therefore, housed inside the housing apparatuses, such as in particular for the application of coil blocks with pressure provided hydraulic pressing devices require little maintenance.
  • FIG. 1 denotes a vacuum-tight autoclave, which is connected via a through-valve 2 to a vacuum pump 3 and which can be connected to circulating air via a venting valve 4.
  • the autoclave receives three windings 51, 52, 53 and 61, 62, 62 and 71, 72 and not shown solid-state insulating coil blocks 5 and 6 and 7, respectively.
  • the windings, e.g. 51, 52, 53, each coil block, e.g. 5, may be formed similar and are connected in parallel.
  • Two power connections to the windings of each coil block are guided by means not designated passages from the interior of the autoclave 1 to a switching device 8, which in turn is in operative connection with the output of a DC power source 9.
  • the DC power source 9 has a transformer 10 and a rectifier 11 acting on the changeover switch 8, and a tap changer 12 connected between the transformer 10 and the rectifier 11.
  • a current and voltage converter 13 is arranged in a connecting line between the output of the rectifier 11 and an input of the switching device 8 .
  • the output signals of the current and voltage converter 13 act on a control device 14.
  • This control device is in operative connection with the transformer 10, the tap changer 12, the rectifier 11 and the switching device 8.
  • In the autoclave 1 are also preferably a hydraulically acting pressing device 15 and a circulating air fan 16 arranged.
  • windings 51, 52, 53 and 61, 62, 63 and 71, 72 although identical in each of the coil blocks 5 and 6 and 7 respectively associated with each one phase of a rotary current, but differently formed in each of the Spulenblökke ,
  • the windings of the individual coil blocks are heated staggered in time. This is achieved by initially the two switching points 82 and 83 are open and the switching point 81 is closed. After a predetermined by monitoring the winding temperature heating period then the switching point 81 is opened and heated after closing the switch 82 of the coil block 6 with direct current. In a corresponding manner, the coil block 7 and then in a cyclical manner, in turn, all the coil blocks are heated in turn.
  • windings are non-uniform within a coil block-for example, as an upper and lower-voltage winding of a transformer-one of the switching points, for example 81, can be connected to the high-voltage winding and another one of the switching points, for example 82, to the low-voltage winding.
  • the windings provided in a single coil block can then be heated staggered over time.
  • the winding temperature can be determined indirectly via the current and voltage values of the DC current output by the current and voltage converter or from a measurement of the electrical resistance of the windings. Alternatively or additionally, it is also possible to determine this temperature by sensors which are guided through the autoclave housing to the respective windings.
  • the air in the autoclave 1 is heated under reduced pressure.
  • the vent valve 4 is closed and the air pressure in the autoclave by pumping air through the open through-valve 2 and the vacuum pump 3 to a few hundred mbar, for example 500 mbar, reduced.
  • the air pressure should be less than atmospheric pressure and preferably between 950 and 500 mbar.
  • the air pressure in the autoclave 1 is lowered by means of the vacuum pump 3 to less than 500 mbar during the heating, but at most to 0.1 mbar for reasons of economy.
  • the current intensity of the direct current is also increased. This is mainly because, as a result of the lowered pressure in the autoclave 1, more water evaporates from the solid insulation.
  • a new heating cycle begins.
  • the current of the direct current is reduced. It is set to be smaller than in the previous cycle. This is due to the fact that on the one hand not so much water is to be removed from the solid insulation as at the beginning of heating, and that on the other hand, the autoclave 1 is already heated almost to its target temperature, for example 70 or 80 ° C.
  • the windings are further heated by the direct current, and accordingly the solid insulation by heat, which will dissipate from the windings and the circulating air.
  • the autoclave 1 reaches its final temperature.
  • the heating of the autoclave is now throttled so that its temperature T a remains constant at the end temperature.
  • an upper winding temperature is reached at time t 4 .
  • the air pressure in autoclave is now lowered continuously.
  • the strength and duration of the direct current are adjusted so that the upper winding temperature is kept constant. This is achieved by stopping the DC current when the windings are held at the upper winding temperature when the temperature T w of the windings exceeds the upper winding temperature by a predetermined limit.
  • the direct current is switched on again.
  • the autoclave 1 is slowly cooled by further reduction of the heating. From time t 4 , the residual moisture is removed from the solid insulation practically under vacuum with low energy input.
  • the coil blocks are subjected to a uniform acting pressing pressure.
  • This pressing pressure is generated by the pressing device 15 and can be pulsating according to the air pressure in the autoclave. Due to the pressing pressure, the coil blocks are stabilized and adapted to specified dimensions.
  • the coil blocks are sufficiently pre-dried and can be installed after cooling and opening the autoclave in dedicated electrical equipment or machinery.
  • the switching device 8 is eliminated and the three coil blocks 5, 6, 7 are heated by one of three DC sources 9, 9 ', 9''.
  • These DC sources each include a rectifier, a transformer and a tap changer connected between the transformer and the rectifier.
  • the for the Temperature measurement required measurement data provide three current and voltage transformers 13, 13 ', 13'', which are arranged in the power supply to one of the three coil blocks 5, 6, 7.
  • three differently shaped coil blocks can be heated simultaneously with direct current and kept at temperature.
  • the DC power sources 9, 9 'and 9 "shown in FIGS. 1 and 3 do not necessarily have to include a transformer with a downstream tap changer. You can also have a variable transformer whose adjustable output voltage is fed directly to the input of the rectifier.
  • a three-phase low-frequency alternating current with frequencies of approximately 0.1 to approximately 20 Hz is used as the heating current.
  • This current is supplied by an AC-AC converter 90 and guided through non-designated passages through the wall of a correspondingly autoclave 1 gas-tight housing 1 'of a transformer 100 at its switched example as a star primary windings 101.
  • the secondary windings 102 of the transformer 100 are short-circuited.
  • the windings 101 and 102 are part of a solid insulation and a magnetic core containing coil block 103.
  • two devices is heated with circulating air.
  • Heated air is advantageously supplied via the vent valve 4 and distributed by the circulating air fan 16 in the entire housing 1 '.
  • the combination of the low-frequency AC heating and the thermally heated air achieves particularly efficient predrying of the solid-state insulation, the magnetic core and the coil block of the transformer 100 containing the windings 101 and 102.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Induction Heating (AREA)
  • Drying Of Solid Materials (AREA)
EP19970810170 1996-04-09 1997-03-21 Verfahren zur Vortrocknung eines mindestens eine Wicklung und Feststoffisolationen enthaltenden Spulenblocks und Vorrichtungen zur Durchführung dieses Verfahrens Expired - Lifetime EP0801405B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19614004 1996-04-09
DE1996114004 DE19614004A1 (de) 1996-04-09 1996-04-09 Verfahren zur Vortrocknung eines mindestens eine Wicklung und Feststoffisolationen enthaltenden Spulenblocks und Vorrichtungen zur Durchführung dieses Verfahrens

Publications (3)

Publication Number Publication Date
EP0801405A2 EP0801405A2 (de) 1997-10-15
EP0801405A3 EP0801405A3 (enrdf_load_stackoverflow) 1997-10-29
EP0801405B1 true EP0801405B1 (de) 2006-01-18

Family

ID=7790797

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970810170 Expired - Lifetime EP0801405B1 (de) 1996-04-09 1997-03-21 Verfahren zur Vortrocknung eines mindestens eine Wicklung und Feststoffisolationen enthaltenden Spulenblocks und Vorrichtungen zur Durchführung dieses Verfahrens

Country Status (2)

Country Link
EP (1) EP0801405B1 (enrdf_load_stackoverflow)
DE (2) DE19614004A1 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10035948A1 (de) * 2000-07-21 2002-02-07 Alstom Verfahren und Vorrichtung zum Trocknen einer Isolation eines elektrischen Geräts, insbesondere eines Transformators oder einer Drossel oder dergleichen
DE50204915D1 (de) 2001-04-24 2005-12-22 Abb Schweiz Ag Verfahren zum Trocknen eines Aktivteils und Vorrichtung zur Durchführung dieses Verfahrens
DE102011053288A1 (de) 2011-09-06 2013-03-07 Wilhelm Hedrich Vakuumanlagen Gmbh & Co. Kg Vorrichtung zum Aufheizen und Trocknen eines Gutes
CN108712037A (zh) * 2018-06-01 2018-10-26 安徽晋煤中能化工股份有限公司 一种6kV同步电动机定子绕组干燥方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2146657A5 (enrdf_load_stackoverflow) * 1971-07-22 1973-03-02 Jeumont Schneider
JPS57102007A (en) * 1980-12-17 1982-06-24 Fuji Electric Co Ltd Drying of internal parts of inductive electric appliances
DE3927964A1 (de) * 1989-08-24 1991-03-21 Leybold Ag Stromversorgung zum trocknen von transformator-teilen
FR2654249B1 (fr) * 1989-11-09 1992-01-03 Cahueau Colette Procedes de sechage impregnation polymerisation controles.
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

Also Published As

Publication number Publication date
EP0801405A3 (enrdf_load_stackoverflow) 1997-10-29
DE19614004A1 (de) 1997-10-16
DE59712551D1 (de) 2006-04-06
EP0801405A2 (de) 1997-10-15

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