EP0481239A1 - Oil filter, especially for tap changes of step-down transformers - Google Patents

Oil filter, especially for tap changes of step-down transformers Download PDF

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Publication number
EP0481239A1
EP0481239A1 EP91116009A EP91116009A EP0481239A1 EP 0481239 A1 EP0481239 A1 EP 0481239A1 EP 91116009 A EP91116009 A EP 91116009A EP 91116009 A EP91116009 A EP 91116009A EP 0481239 A1 EP0481239 A1 EP 0481239A1
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EP
European Patent Office
Prior art keywords
oil
filter
moisture
filter chamber
chamber
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Granted
Application number
EP91116009A
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German (de)
French (fr)
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EP0481239B1 (en
Inventor
Karl Dipl.-Ing. Stenzel (Fh)
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Maschinenfabrik Reinhausen GmbH
Scheubeck GmbH and Co
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Maschinenfabrik Reinhausen GmbH
Maschinenfabrik Reinhausen Gebrueder Scheubeck GmbH and Co KG
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Publication of EP0481239A1 publication Critical patent/EP0481239A1/en
Application granted granted Critical
Publication of EP0481239B1 publication Critical patent/EP0481239B1/en
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    • 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
    • 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 invention relates to an oil filter according to the preamble of the claim.
  • Such oil filters are known: DE-OS 22 57 615.
  • transformer oil serving as a cooling and insulating liquid is subject to both contamination and undesirable water absorption during operation of the transformer.
  • the combustion and combustion residues are usually removed from the diverter switch oil by filters.
  • the combustion and combustion residues are usually removed from the diverter switch oil by filters. It is both known, for example from DE 25 12 145, to provide a filter device consisting of deposition surfaces in the diverter switch vessel itself, and, as disclosed for example in DE 29 48 111, to provide a separate oil filter system consisting of filter and circulating pump, which continuously switches the diverter switch oil or circulated periodically and thereby retains the combustion and combustion residues.
  • an oil filter in which the water components are filtered out of the oil of a transformer by means of moisture-absorbing or hygroscopic materials between an oil circulation pump and a conventional oil filter.
  • the filter consists of a mixture of absorption granules to absorb the water components and filter granules.
  • the contaminants to be filtered out due to the aging of the transformer oil form an oil sludge that surrounds and glues the surface of the individual granules and thus prevents the desired moisture absorption after a short time.
  • the filter In order to achieve at least a reasonably satisfactory mode of operation over a longer period of time in the known filter, the filter would have to have a large longitudinal expansion in the direction of flow of the oil, so that the oil to be filtered is guided past as much granulate as possible; Of course, the aim is to make the filter construction as compact as possible.
  • the object of the present invention is to provide a compact and simply constructed oil filter of the type described at the outset which allows efficient filtering of both the combustion and combustion residues on the one hand and the water components on the other hand, in particular of diverter switch oil from tap changers.
  • the filter according to the invention allows both conventional filtering, i.e. Cleaning of solid components, the oil as well as its drying. Because in the same filter the filtering off of combustion and combustion residues, other abrasion etc. takes place and only then is the filtered oil pressed through the water-absorbing area, it is impossible for oil sludge to settle in this water-absorbing area, which could seal the surface of the absorption material. Since this danger no longer exists, the grain size of a granulate used especially for this purpose can be selected to be small, regardless of oil sludge deposits, and the effective absorption surface can thus be increased.
  • the inner chamber is additionally penetrated like a labyrinth with guide elements which, for example arranged vertically or horizontally, extend the path that the oil has to travel through the inner chamber to the outlet opening and thus the effective absorption surface, i.e. increase the surface area that the oil flows through in the inner chamber.
  • Figure 1 shows the filter according to the invention in a corresponding filter housing schematically in a lateral sectional view.
  • the actual oil filter is arranged in its oil space 2 and fastened with a fastening bolt 9. It is designed as a hollow cylinder and has an outer filter wall 3 with oil inlet openings 5 and an inner filter wall 4 with oil outlet openings 6. The end faces are sealed liquid and gas-tight by plates 10 and 11.
  • An outer filter chamber 7 and an inner filter chamber 8 are arranged concentrically inside the filter.
  • the outer filter chamber is made with conventional material to filter out the burn-up and combustion residues, for example with filter paper in a lamella arrangement, glass wool or similar. filled.
  • the inner filter chamber 8 is covered with a granulate of water-absorbing material, e.g. Zeolite, filled and interspersed with guide elements 12, which are designed as disks and penetrate the inner filter chamber 8 like a labyrinth.
  • a granulate of water-absorbing material e.g. Zeolite
  • this intermediate wall which is also not shown in the drawing, can be omitted.
  • the oil within the inner filter chamber 8 is positively guided by the guide elements 12, which are designed, for example, as flat, vertical disks; it travels a much larger distance to the oil outlet openings 6 than corresponds to the length of the oil filter.
  • the effective surface of the granules or the like in the inner filter chamber 8, over which the oil flows, can be substantially increased without enlarging the filter dimensions, which in turn allows improved water absorption.
  • the guide elements can also be designed differently within the scope of the invention; for example, they can form concentric cylinders, shells, segments or the like.
  • Figure 2 shows such a further embodiment of the filter.

Abstract

The invention relates to an oil filter, especially for tap changers of tapped transformers, as a component of a separate filter circuit, the oil filter having two concentrically arranged filter chambers. In this case, the outer filter chamber is used for filtering out solid impurities and the inner filter chamber, in which, if required, guide elements are arranged in the form of a labyrinth, is filled with moisture-absorbing material and is used for extraction of the water that is in the oil. <IMAGE>

Description

Die Erfindung betrifft ein Ölfilter gemäß dem Oberbegriff des Patentanspruches.The invention relates to an oil filter according to the preamble of the claim.

Solche Ölfilter sind bekannt: DE-OS 22 57 615.Such oil filters are known: DE-OS 22 57 615.

Es ist bekannt, daß das als Kühl- und Isolierflüssigkeit dienende Transformatoröl im Betrieb des Transformators sowohl einer Verschmutzung als auch einer ebenfalls unerwünschten Wasseraufnahme unterliegt.It is known that the transformer oil serving as a cooling and insulating liquid is subject to both contamination and undesirable water absorption during operation of the transformer.

Noch wesentlich stärker ist die Verschmutzung des Öles im Ölgefäß eines Stufenschalters, weswegen dieses Ölgefäß, in dem sich der Lastumschalter befindet, regelmäßig vom Ölraum des übrigen Transformators getrennt ist. Diese Verschmutzungen bestehen aus Abbrandprodukten der Kontakte durch die beim Schalten unvermeidliche Lichtbogenbildung, Verbrennungsrückständen durch thermische Beanspruchung des Lastumschalteröles sowie aufgenommenen Wasserbestandteilen.The contamination of the oil in the oil reservoir of a tap changer is even more severe, which is why this oil reservoir, in which the diverter switch is located, is regularly separated from the oil compartment of the rest of the transformer. This contamination consists of consumable products of the contacts due to the inevitable arcing when switching, combustion residues due to thermal stress on the diverter switch oil and absorbed water components.

Besonders bei Stufenschaltern mit hoher Schaltzahl ist eine starke Verschmutzung des Öles im Ölgefäß des Stufenschalters festzustellen.Heavy oil contamination in the oil tank of the tap changer is particularly noticeable with tap changers with a high number of operations.

Dabei ist eine solche Verschmutzung gerade bei Anwendungen solcher Stufenschalter mit ständiger Spannungsbeanspruchung der im Lastumschalteröl befindlichen Isolierteile nachteilig und muß durch eine geeignete Reinigung vermieden werden.Such contamination is disadvantageous especially in applications of such tap changers with constant voltage stress on the insulating parts in the diverter switch oil and must be avoided by suitable cleaning.

Die Abbrand- und Verbrennungsrückstände werden üblicherweise durch Filter aus dem Lastumschalteröl entfernt.The combustion and combustion residues are usually removed from the diverter switch oil by filters.

Die Abbrand- und Verbrennungsrückstände werden üblicherweise durch Filter aus dem Lastumschalteröl entfernt. Dabei ist es sowohl bekannt, beispielsweise aus der DE 25 12 145, eine aus Ablagerungsflächen bestehende Filtereinrichtung im Lastumschaltergefäß selbst vorzusehen, als auch, wie beispielsweise in DE 29 48 111 offenbart, eine separate aus Filter und Umwälzpumpe bestehende Ölfilteranlage vorzusehen, die das Lastumschalteröl kontinuierlich oder periodisch umwälzt und dabei die Abbrand- und Verbrennungsrückstände zurückhält.The combustion and combustion residues are usually removed from the diverter switch oil by filters. It is both known, for example from DE 25 12 145, to provide a filter device consisting of deposition surfaces in the diverter switch vessel itself, and, as disclosed for example in DE 29 48 111, to provide a separate oil filter system consisting of filter and circulating pump, which continuously switches the diverter switch oil or circulated periodically and thereby retains the combustion and combustion residues.

Aus der DE 22 57 615 ist ein Ölfilter bekannt, bei dem durch feuchtigkeitsabsorbierende bzw. hygroskopische Materialien zwischen einer Ölumlaufpumpe und einem üblichen Ölfilter die Wasserbestandteile aus dem Öl eines Transformators herausgefiltert werden. Dazu besteht das Filter aus einem Gemisch von Absorptionsgranulat zur Aufnahme der Wasserbestandteile sowie Filtergranulat.From DE 22 57 615 an oil filter is known in which the water components are filtered out of the oil of a transformer by means of moisture-absorbing or hygroscopic materials between an oil circulation pump and a conventional oil filter. For this purpose, the filter consists of a mixture of absorption granules to absorb the water components and filter granules.

Dieses bekannte Filter ist jedoch nicht für Stufenschalteröl, das, anders als herkömmliches Transformatoröl, zahlreiche Abbrand- und Verbrennungsrückstände enthält, geeignet.However, this known filter is not suitable for tap changer oil, which, unlike conventional transformer oil, contains numerous combustion and combustion residues.

Darüber hinaus hat es zahlreiche Nachteile im praktischen Betrieb, so daß es trotz seines einfachen und kostengünstigen Aufbaus nicht angewendet wird.In addition, it has numerous disadvantages in practical operation, so that it is not used despite its simple and inexpensive construction.

Die auszufilternden Verunreinigungen durch Alterung des Transformatorenöles bilden einen ÖIschlamm, der die Oberfläche der einzelnen Granulatkügelchen umschließt und verklebt und somit schon nach kurzer Zeit die angestrebte Feuchtigkeitsabsorption unterbindet. Um bei dem bekannten Filter wenigstens eine einigermaßen befriedigende Wirkungsweise über einen längeren Zeitraum zu erreichen, müßte das Filter eine in Strömungsrichtung des Öles große Längenausdehnung besitzen, damit das zu filternde Öl an möglichst viel Granulat vorbeigeführt wird; angestrebt wird natürlich eher eine möglichst kompakte Filterbauweise.The contaminants to be filtered out due to the aging of the transformer oil form an oil sludge that surrounds and glues the surface of the individual granules and thus prevents the desired moisture absorption after a short time. In order to achieve at least a reasonably satisfactory mode of operation over a longer period of time in the known filter, the filter would have to have a large longitudinal expansion in the direction of flow of the oil, so that the oil to be filtered is guided past as much granulate as possible; Of course, the aim is to make the filter construction as compact as possible.

Ein weiterer Widerspruch ergibt sich bei dem bekannten Filter daraus, daß einerseits das Granulat zur Erzielung einer großen wirksamen Oberfläche möglichst feinkörnig sein muß, andererseits aber gerade bei einer kleinen Körnung sich der Ölschlamm alsbald mit dem Granulat vermischt und die Oberfläche, wie eben erläutert, vollständig umschließt.Another contradiction arises in the known filter from the fact that on the one hand the granulate must be as fine-grained as possible in order to achieve a large effective surface, but on the other hand the oil sludge immediately mixes with the granulate and the surface completely, as just explained, especially with a small grain size encloses.

Aufgabe der vorliegenden Erfindung ist es, ein kompaktes und einfach aufgebautes Ölfilter der eingangs beschriebenen Art anzugeben, das eine effiziente und langzeitstabile Filterung sowohl der Abbrand- und Verbrennungsrückstände einerseits als auch der Wasserbestandteile andererseits, insbesondere von Lastumschalteröl von Stufenschaltern, gestattet.The object of the present invention is to provide a compact and simply constructed oil filter of the type described at the outset which allows efficient filtering of both the combustion and combustion residues on the one hand and the water components on the other hand, in particular of diverter switch oil from tap changers.

Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Anspruches 1 genannten Merkmale gelöst.This object is achieved by the features mentioned in the characterizing part of claim 1.

Das erfindungsgemäße Filter gestattet einerseits gleichzeitig sowohl die herkömmliche Filterung, d.h. Reinigung von festen Bestandteilen, des Öles als auch seine Trocknung. Dadurch, daß im gleichen Filter zeitlich zuerst die Ausfilterung von Abbrand- und Verbrennungsrückständen, sonstigem Abrieb u.ä. erfolgt und erst dann das gefilterte Öl durch den wasserabsorbierenden Bereich gedrückt wird, ist es unmöglich, daß sich noch in diesem wasserabsorbierenden Bereich Ölschlamm absetzt, der die Oberfläche des Absorptionsmaterial verschließen könnte. Da diese Gefahr nicht mehr besteht, kann beim erfindungsgemäßen Filter die Korngröße eines extra dafür eingesetzten Granulats ohne Rücksicht auf Ölschlammablagerungen klein gewählt und damit die effektive Absorptionsoberfläche vergrößert werden.The filter according to the invention allows both conventional filtering, i.e. Cleaning of solid components, the oil as well as its drying. Because in the same filter the filtering off of combustion and combustion residues, other abrasion etc. takes place and only then is the filtered oil pressed through the water-absorbing area, it is impossible for oil sludge to settle in this water-absorbing area, which could seal the surface of the absorption material. Since this danger no longer exists, the grain size of a granulate used especially for this purpose can be selected to be small, regardless of oil sludge deposits, and the effective absorption surface can thus be increased.

In einer bevorzugten Ausführungsform der Erfindung ist die innere Kammer zusätzlich labyrinthartig mit Leitelementen durchsetzt, die, beispielsweise vertikal oder horizontal angeordnet, den Weg, den das öl durch die innere Kammer bis zur Austrittsöffnung zurücklegen muß,verlängern und damit die wirksame Absorptionsoberfläche, d.h. die Oberfläche, die das Öl in der inneren Kammer durchströmt, nochmals vergrößern.In a preferred embodiment of the invention the inner chamber is additionally penetrated like a labyrinth with guide elements which, for example arranged vertically or horizontally, extend the path that the oil has to travel through the inner chamber to the outlet opening and thus the effective absorption surface, i.e. increase the surface area that the oil flows through in the inner chamber.

Die Erfindung soll nachstehend anhand eines Ausführungsbeispieles näher erläutert werden.The invention will be explained in more detail below using an exemplary embodiment.

Die Figur 1 zeigt das erfindungsgemäße Filter in einem entsprechenden Filtergehäuse schematisch in seitlicher Schnittdarstellung.Figure 1 shows the filter according to the invention in a corresponding filter housing schematically in a lateral sectional view.

Innerhalb des Filtergehäuses 1, das an zwei gegenüberliegenden Seiten in bekannter Weise Öleinlaß- und -auslaßflansche zur Verbindung mit der Leitung des Ölfiltersystems besitzt, ist in seinem Ölraum 2 das eigentliche Ölfilter angeordnet und mit einem Befestigungsbolzen 9 befestigt. Es ist als Hohlzylinder ausgebildet und weist eine äußere Filterwand 3 mit Öleintrittsöffnungen 5 und eine innere Filterwand 4 mit Ölaustrittsöffnungen 6 auf. Die Stirnseiten sind durch Platten 10 und 11 flüssigkeits- und gasdicht verschlossen.Within the filter housing 1, which has oil inlet and outlet flanges on two opposite sides in a known manner for connection to the line of the oil filter system, the actual oil filter is arranged in its oil space 2 and fastened with a fastening bolt 9. It is designed as a hollow cylinder and has an outer filter wall 3 with oil inlet openings 5 and an inner filter wall 4 with oil outlet openings 6. The end faces are sealed liquid and gas-tight by plates 10 and 11.

Im Inneren des Filters sind konzentrisch eine äußere Filterkammer 7 und eine innere Filterkammer 8 angeordnet. Die äußere Filterkammer ist mit konventionellem Material zur Ausfilterung der Abbrand- und Verbrennungsrückstände, beispielsweise mit Filterpapier in Lamellenanordnung, Glaswolle o.ä. gefüllt.An outer filter chamber 7 and an inner filter chamber 8 are arranged concentrically inside the filter. The outer filter chamber is made with conventional material to filter out the burn-up and combustion residues, for example with filter paper in a lamella arrangement, glass wool or similar. filled.

Die innere Filterkammer 8 ist mit einem Granulat wasserabsorbierenden Materials, z.B. Zeolith, gefüllt und mit Leitelementen 12 durchsetzt, die als Scheiben ausgebildet sind und die innere Filterkammer 8 labyrinthartig durchsetzt.The inner filter chamber 8 is covered with a granulate of water-absorbing material, e.g. Zeolite, filled and interspersed with guide elements 12, which are designed as disks and penetrate the inner filter chamber 8 like a labyrinth.

Es ist möglich, zusätzlich zwischen den beiden Filterkammern 7, 8 eine öldurchlässige Wand, Membran o.ä. anzuordnen, die das Durchströmen des Öles ermöglicht und gleichzeitig die unterschiedlichen Materialien, Granulate o.ä. in den beiden Filterkammern 7, 8 voneinander trennt.It is also possible to have an oil-permeable wall, membrane or the like between the two filter chambers 7, 8. to arrange, which allows the oil to flow through and at the same time the different materials, granules or the like. separates from each other in the two filter chambers 7, 8.

Ist jedoch beispielsweise die äußere Filterkammer 7 lamellenartig mit Filterpapier gefüllt, kann diese, in der Zeichnung auch nicht dargestellte, Zwischenwand entfallen.However, if, for example, the outer filter chamber 7 is filled with filter paper in the manner of a lamella, this intermediate wall, which is also not shown in the drawing, can be omitted.

Durch die Leitelemente 12, die beispielhaft als ebene, vertikale Scheiben ausgebildet sind, wird das Öl innerhalb der inneren Filterkammer 8 zwangsgeführt; es legt einen wesentlich größeren Weg bis zu den Ölaustrittsöffnungen 6 zurück, als der Länge des Ölfilters entspricht. Dadurch läßt sich die wirksame Oberfläche des Granulates o. dgl. in der inneren Filterkammer 8, die vom Öl überströmt wird, ohne Vergrößerung der Filterabmessungen wesentlich erhöhen, was wiederum eine verbesserte Wasserabsorption gestattet. Natürlich können die Leitelemente im Rahmen der Erfindung auch anders ausgebildet sein; sie können beispielsweise konzentrische Zylinder, - schalen, -segmente oder dgl. bilden. Figur 2 zeigt eine solche weitere Ausführungsform des Filters.The oil within the inner filter chamber 8 is positively guided by the guide elements 12, which are designed, for example, as flat, vertical disks; it travels a much larger distance to the oil outlet openings 6 than corresponds to the length of the oil filter. As a result, the effective surface of the granules or the like in the inner filter chamber 8, over which the oil flows, can be substantially increased without enlarging the filter dimensions, which in turn allows improved water absorption. Of course, the guide elements can also be designed differently within the scope of the invention; for example, they can form concentric cylinders, shells, segments or the like. Figure 2 shows such a further embodiment of the filter.

Wesentlich ist ausschließlich die Verlängerung des vom Öl zurückzulegenden Weges.The only thing that is essential is the extension of the distance covered by the oil.

Zusammenfassend ist festzustellen, daß dadurch, daß die ausgefilterten Ölrückstände, die zur Ölschlammbildung führen, zurückgehalten werden, bevor sie das wasserabsorbierende Filtermaterial schädigen können und gleichzeitig durch die beschriebene Vergrößerung der Absorptionsoberfläche eine optimale Reinigung des Öles bei geringem Aufwand erreicht wird.In summary, it can be stated that the filtered oil residues, which lead to the formation of oil sludge, are retained before they can damage the water-absorbing filter material and, at the same time, optimal cleaning of the oil is achieved with little effort by the described enlargement of the absorption surface.

Claims (2)

1. Ölfilter zum Reinigen und Trocknen von Isolieröl, vorzugsweise für Stufenschalter von Stufentransformatoren, in Form eines Hohlzylinders, wobei das zu filternde Öl sowohl ein Material zur Ausfilterung fester Bestandteile als auch ein feuchtigkeitsabsorbierendes Material durchläuft,
dadurch gekennzeichnet,
daß das Ölfilter innerhalb einer äußeren Filterwand (3) in zwei konzentrisch angeordnete Filterkammern (7, 8) unterteilt ist,
daß das Öl durch Öleintrittsöffnungen (5) in der Mantel-fläche der äußeren Filterwand (3) radial von außen nach innen durch das Ölfilter gedrückt wird,
daß die innere Filterkammer (8) das feuchtigkeitsabsorbierende Material enthält und
daß in der inneren Filterkammer (8) Leitelemente oder -bleche (12) labyrinthartig derart angeordnet sind,
daß der Weg des Öles durch die innere Filterkammer (8) verlängert, aber nicht unterbrochen wird.1. Oil filter for cleaning and drying insulating oil, preferably for tap changers of tap transformers, in the form of a hollow cylinder, the oil to be filtered passing through both a material for filtering out solid components and a moisture-absorbing material,
characterized,
that the oil filter is divided into two concentrically arranged filter chambers (7, 8) within an outer filter wall (3),
that the oil is pushed radially from the outside through the oil filter through oil inlet openings (5) in the outer surface of the outer filter wall (3),
that the inner filter chamber (8) contains the moisture-absorbing material and
that guide elements or plates (12) are arranged in a labyrinth-like manner in the inner filter chamber (8),
that the path of the oil through the inner filter chamber (8) is extended, but not interrupted. 2. Ölfilter nach Anspruch 1,
dadurch gekennzeichnet,
daß als feuchtigkeitsabsorbierende Material in der inneren Filterkammer (8) hygroskopisches Granulat, insbesondere Zeolith, verwendet wird.2. Oil filter according to claim 1,
characterized,
that hygroscopic granules, in particular zeolite, are used as the moisture-absorbing material in the inner filter chamber (8).
EP91116009A 1990-10-19 1991-09-20 Oil filter, especially for tap changes of step-down transformers Expired - Lifetime EP0481239B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4033172A DE4033172C1 (en) 1990-10-19 1990-10-19
DE4033172 1990-10-19

Publications (2)

Publication Number Publication Date
EP0481239A1 true EP0481239A1 (en) 1992-04-22
EP0481239B1 EP0481239B1 (en) 1994-05-18

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EP91116009A Expired - Lifetime EP0481239B1 (en) 1990-10-19 1991-09-20 Oil filter, especially for tap changes of step-down transformers

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EP (1) EP0481239B1 (en)
JP (1) JP2515359Y2 (en)
AT (1) ATE105968T1 (en)
BR (1) BR9103824A (en)
DE (2) DE4033172C1 (en)

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CN104979078A (en) * 2015-07-01 2015-10-14 陕西金源自动化科技有限公司 Maintenance-free moisture absorber and method for controlling the same
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KR20010076864A (en) * 2000-01-28 2001-08-16 류르만 하로엠, 마이어 게럴드 Oil filter unit for tap selector switch
WO2003077267A1 (en) * 2002-03-08 2003-09-18 Maschinenfabrik Reinhausen Gmbh Oil filter system
WO2004088679A2 (en) * 2003-04-04 2004-10-14 Maschinenfabrik Reinhausen Gmbh Air de-humidifier for oil-insulated transformers, choke coils and step switches
WO2004088679A3 (en) * 2003-04-04 2004-12-09 Reinhausen Maschf Scheubeck Air de-humidifier for oil-insulated transformers, choke coils and step switches
US7563310B2 (en) 2003-04-04 2009-07-21 Maschinenfabrik Reinhausen Gmbh Air dehumidifier for oil-insulated transformers, choke coils and steps switches
CN102723170A (en) * 2012-01-04 2012-10-10 吴江市东泰电力特种开关有限公司 On-load tap-switch separated-type oil chamber
CN102825024A (en) * 2012-09-14 2012-12-19 保定天威集团有限公司 Filter screen cleaning method of transformer washing device
CN102825024B (en) * 2012-09-14 2014-03-12 保定天威集团有限公司 Filter screen cleaning method of transformer washing device
CN105612586B (en) * 2013-04-17 2017-10-17 Abb 技术有限公司 Dehydrating breather in electrical equipment
WO2014170263A1 (en) 2013-04-17 2014-10-23 Abb Technology Ltd Moisture absorber in electrical equipment
CN105612586A (en) * 2013-04-17 2016-05-25 Abb技术有限公司 Moisture absorber in electrical equipment
EP2743943A1 (en) 2013-05-22 2014-06-18 ABB Technology Ltd Transformer tap changer
CN104979078A (en) * 2015-07-01 2015-10-14 陕西金源自动化科技有限公司 Maintenance-free moisture absorber and method for controlling the same
CN104979078B (en) * 2015-07-01 2017-01-25 陕西金源自动化科技有限公司 Maintenance-free moisture absorber and method for controlling the same
CN108987060A (en) * 2018-08-03 2018-12-11 安徽柒海智能控制技术有限公司 A kind of transformer breather and its operation method
CN108987060B (en) * 2018-08-03 2021-01-12 安徽柒海智能控制技术有限公司 Transformer respirator and operation method thereof
WO2020052905A1 (en) * 2018-09-11 2020-03-19 Mann+Hummel Gmbh Drying system, dryer cartridge, and use of a dryer cartridge
WO2020052906A1 (en) * 2018-09-11 2020-03-19 Mann+Hummel Gmbh Dryer cartridge, drying system, and use thereof
CN112654407A (en) * 2018-09-11 2021-04-13 曼·胡默尔有限公司 Dryer core box, drying system and use thereof
US11931670B2 (en) 2018-09-11 2024-03-19 Mann+Hummel Gmbh Dryer cartridge, drying system, and use thereof
CN111228891A (en) * 2020-03-22 2020-06-05 贵州锦秀黔川环境保护工程有限公司 Mine sewage treatment integrated equipment
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DE59101667D1 (en) 1994-06-23
BR9103824A (en) 1992-05-19
JP2515359Y2 (en) 1996-10-30
EP0481239B1 (en) 1994-05-18
JPH0496823U (en) 1992-08-21
DE4033172C1 (en) 1992-05-21
ATE105968T1 (en) 1994-06-15

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