CN105612586A - Moisture absorber in electrical equipment - Google Patents
Moisture absorber in electrical equipment Download PDFInfo
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- CN105612586A CN105612586A CN201480034509.6A CN201480034509A CN105612586A CN 105612586 A CN105612586 A CN 105612586A CN 201480034509 A CN201480034509 A CN 201480034509A CN 105612586 A CN105612586 A CN 105612586A
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- electrical equipment
- water adsorbent
- adsorbent element
- electrical insulation
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- 239000006096 absorbing agent Substances 0.000 title 1
- 239000012530 fluid Substances 0.000 claims abstract description 155
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 130
- 239000003463 adsorbent Substances 0.000 claims description 105
- 239000000463 material Substances 0.000 claims description 88
- 238000010292 electrical insulation Methods 0.000 claims description 74
- 239000002245 particle Substances 0.000 claims description 37
- 239000003921 oil Substances 0.000 claims description 31
- 239000002250 absorbent Substances 0.000 claims description 17
- 230000002745 absorbent Effects 0.000 claims description 17
- 239000001913 cellulose Substances 0.000 claims description 14
- 229920002678 cellulose Polymers 0.000 claims description 14
- 239000002480 mineral oil Substances 0.000 claims description 10
- 235000010446 mineral oil Nutrition 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 9
- 150000002148 esters Chemical class 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000010696 ester oil Substances 0.000 claims description 5
- 150000002632 lipids Chemical class 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 229940099259 vaseline Drugs 0.000 claims description 3
- 229920000742 Cotton Polymers 0.000 claims description 2
- 239000004927 clay Substances 0.000 claims description 2
- 239000012141 concentrate Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 229920005615 natural polymer Polymers 0.000 claims description 2
- 229920002401 polyacrylamide Polymers 0.000 claims description 2
- 239000002861 polymer material Substances 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 229920001059 synthetic polymer Polymers 0.000 claims description 2
- 239000002982 water resistant material Substances 0.000 abstract 2
- 239000007788 liquid Substances 0.000 description 11
- 238000009413 insulation Methods 0.000 description 8
- 230000009102 absorption Effects 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 7
- 239000008187 granular material Substances 0.000 description 7
- 239000000123 paper Substances 0.000 description 7
- 238000004804 winding Methods 0.000 description 7
- 230000007704 transition Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 239000000741 silica gel Substances 0.000 description 5
- 229910002027 silica gel Inorganic materials 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011111 cardboard Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011087 paperboard Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 241000009298 Trigla lyra Species 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000003862 health status Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920001467 poly(styrenesulfonates) Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000010148 water-pollination Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/20—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
- H01B7/285—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable
- H01B7/288—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable using hygroscopic material or material swelling in the presence of liquid
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Organic Insulating Materials (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Transformer Cooling (AREA)
Abstract
The present disclosure relates to an electrical equipment (1) configured for comprising an electrically insulating fluid (3), said electrical equipment comprising a water absorbing element (11) protected by a water resistant material (12) which inhibits the water absorbing element from absorbing water from its surroundings, said water resistant material being dissolvable by the electrically insulating fluid.
Description
Technical field
Present disclosure relates to a kind of electrical equipment that comprises hygroscopic element.
Background technology
The electrical insulation fluids of liquid state or gaseous state uses in as transformer, capacitor, switching device, sleeve pipe etc. at electrical equipment, and has a large amount of functions. Insulative dielectric fluid is typically used as the electric insulating medium that the part in equipment with different electromotive forces is separated, and transmits as cooling medium the heat generating in the other parts of current carrying conductor and equipment. In addition, the analysis of fluid provides the means of monitoring during operation the health status of electrical equipment.
Except basic function mentioned above, dielectric fluid also should meet other required and expect requirement. Fluid should contribute to high efficiency, long operation lifetime time and minimum ambient influnence when for electrical equipment. In addition, fluid must be compatible with the material that uses in electrical equipment, and it should not form personnel health and safe danger. In fact, dielectric fluid should present various physics, electricity and chemical attribute. Major part in these attributes regulates by the required standard and the specification that specify each.
Traditionally, the oil based on oil is as the dielectric fluid in the transformer of fluid filling, and this is mainly because about low viscosity, low pour point, high dielectric strength, easy availability and the favourable attribute of low cost. Recently, ester liquid has become the substitute of mineral oil. Ester is due to its high biological degradability and high burning-point/flash-point (300 DEG C of >) but favourable.
Therefore electrical insulation fluids also carries in tap changer (OLTC) for having of power transformer. Tap changer, for power transformer, with by switching and select voltage between the different taps of winding, therefore changes the ratio between winding.
OLTC will make its oily spatial expansion and contraction under different temperatures. This completes by oily expansion vessel, and it is ventilated via silica gel breather conventionally, to avoid moisture to enter in oily space.
Show OLTC and As time goes on anyway all moisture may be accumulated in oil, and therefore needed regularly dry or replaced oil. In water capacity, the time period before too high in oil is depended on a number of factors, as, the installation of weather, OLTC and silica gel breather around, the maintenance of carrying out on silica gel, and depend on the variations in temperature in the OLTC oil space of operating condition.
If contain excess moisture this time period before by likely extending oil, this will be very useful.
As time goes on moisture will during operation or enter in a different manner OLTC oil space during safeguarding. High water capacity is unfavorable for the insulating properties of the insulating polymer (for example, polyester complexes or epoxy compound) of insulating oil in OLTC and use. Enter in oil in order to resist moisture, in this area, aimed at silica gel breather and maintenance thereof.
Can be at a hygroscopic material that is applicable to moisture absorption in scope by adding, as, cellulose/paper, oil can keep dry in the long period. Therefore, for example, in Water in oil amount too high (, higher than the water of 35ppm) or before approaching saturated level, more water can drawing-in system in. Balance between water and paper in oil is known from so-called Piper curve.
OLTC is not having oil condition transport conventionally, and then fills oil in its test or before operating.
EP0481239 discloses the oil filter of the member in the independent filter loop of conduct that a kind of oil that is particularly useful for tap power transformer fills tap changer, and this oil filter has two filter chambers of arranging with one heart, for example, is labyrinth form. In the case, outer filter chamber is used for leaching solid impurity, and for example, by means of filter paper or mineral wool, and interior filter chamber is filled with absorbent material, for example zeolite, and for obtaining the water of oil.
US5,766,464 disclose a kind of oil filtering system of electrical equipment of filling for oil. Pump is for pump oil through filtering tube, and in conduit, pollutant is filtering from oil. If expect to remove moisture from oil, filter medium can comprise dry paper or ion exchange resin, as, Dowex, or other drying material.
CN202134324 (utility model) discloses a kind of oil conservater of on load voltage by-pass cock. Switch comprises via tube connector and is connected to the dehydrating breather on storage cabinet.
JP2007/221047 discloses a kind of power transformer, and its absorbent that excellent dehumidification ability can be provided continuously by providing is removed safely moisture and in long period section, managed fluid insulation thing from fluid insulation thing. The absorbent that can freely take apart is for providing continuous drying.
Summary of the invention
The object of the present invention is to provide a kind of improved moisture absorption system for electrical equipment.
According to an aspect of the present invention; a kind of electrical equipment that is configured to comprise electrical insulation fluids is provided; described electrical equipment comprises the water adsorbent element of being protected by waterproof material; waterproof material stops water adsorbent element from its surrounding environment water suction, and described waterproof material is dissolved at least in part by electrical insulation fluids. Therefore, waterproof material protection water adsorbent element, until it is immersed in described electrical insulation fluids.
According to another aspect of the present invention, provide a kind of electrical insulation fluids from the tap changer for power transformer to remove the method for moisture and particle, the method comprises: a part for the heat heating electrical insulation fluids generating with the electric switch by tap changer, and the stream upwards of electrical insulation fluids produces by the Natural Circulation of the electrical insulation fluids in tap changer thus; Cooling stream upwards, the downward stream of electrical insulation fluids produces by the Natural Circulation of the electrical insulation fluids in tap changer thus; And in the water adsorbent element of at least some granule capturings that the stream by upwards and/or downward stream are carried in tap changer, at least a portion of stream is because Natural Circulation is through this water adsorbent element, thereby removes described particle (and moisture) from electrical insulation fluids.
By the water adsorbent element by means of waterproof material protection, protect water adsorbent element to avoid becoming before dielectric fluid adds electrical equipment and be partly full of for example moisture from air. Certainly; if then water adsorbent element is also prevented from absorbing the moisture (this is the reason that uses water adsorbent element) from dielectric fluid; if or protection waterproof material interlayer for example must remove with hand (this also will mean that water adsorbent element need to easily approach), this self will be problematic. But for the present invention, this is not problem, because waterproof material dissolves/is dissolved in electrical insulation fluids by electrical insulation fluids. Therefore, water adsorbent element discharges from waterproof material in the time that waterproof material no longer needs, and allows water adsorbent element to carry out from its effect of electrical insulation fluids water suction.
In certain embodiments, water adsorbent element is soaked with waterproof material. In some other embodiment, wherein water adsorbent element is enclosed in the packaging or film of being made up of waterproof material. In other embodiment, waterproof material is adhered on the surface of water adsorbent element. In certain embodiments, water adsorbent element is enclosed in by means of waterproof material and is for example held in place, in the waterproof cover of (, glued together around water adsorbent element), and shell will be opened in the time that waterproof material is dissolved by dielectric fluid thus. This will be conducive to reduce to be dissolved in the amount of the waterproof material in dielectric fluid, to reduce the impact of its attribute on dielectric fluid. Can envision some or all of capable of being combined in some cases by means of in these different modes of waterproof material protection water adsorbent element. Use which kind of mode for example to can be depending on the attribute of waterproof material and/or water adsorbent element, and may depend on the easy degree that waterproof material is dissolved by electrical insulation fluids. In certain embodiments, water adsorbent element is positioned in its dedicated chamber, for example, metallic room, for avoid the shell part of non-solubility or also not consoluet waterproof material disturb electrical equipment.
In certain embodiments, waterproof material can be dissolved completely by electrical insulation fluids under the routine operation condition of electrical equipment in one week, as in 48 or 24 hours. Easily, waterproof material can too easily not dissolve, because this can cause waterproof material to be removed at least partly prematurely. In view of the operating time of for example power transformer, interior dissolving in a week can be enough. The time period of for example, dissolving waterproof material completely can and/or be controlled by the amount/thickness of waterproof material by selection waterproof material.
In some cases, waterproof material does not significantly change the electric insulation attribute of electrical insulation fluids in the time being dissolved in electrical insulation fluids. For example, the example of this generic attribute comprises dielectric strength, dielectric loss factor, viscosity, acidity etc., for example, does not expect the resistance or the thermal resistance that wherein reduce dielectric fluid due to waterproof material is dissolved in.
In certain embodiments, waterproof material under the mode of operation of electrical equipment, be dissolved in electrical insulation fluids in time can corroding metal. Because electrical equipment for example, is made up of technology (, iron or copper) at least partly, be that electrical insulation fluids increases corrosivity in the time that waterproof material is dissolved in wherein therefore less desirable.
In certain embodiments, waterproof material is wax or lipid, as, vaseline or synthetic or natural polymer, or mineral oil or the material based on ester. This material can use in conjunction with the present invention easily. Technical staff can be based on present disclosure, for example, depend on attribute, the attribute of electrical insulation fluids and/or the operating condition of electrical equipment of water adsorbent element, finds other material that also may be applicable to. Substantially, waterproof material should be chosen to make it to be for example dissolved in, in dielectric fluid (, mineral oil or the liquid based on ester), simultaneously waterproof (solubility is low in water). Exist in known for example oil-soluble but many materials of water fast, for example, vaseline, it provides as particular instance herein. Therefore technical staff is finding not have any problem aspect material. In addition, technical staff can find applicable waterproof material by normal experiment, for example, and by the solubility of testing some known waterproof materials in the dielectric fluid using.
In certain embodiments, electrical equipment is the system with the system voltage of at least 1 kilovolt or at least 1.5 kilovolts. It can be in high voltage applications, the most harmful when wherein its insulating properties at dielectric fluid are by high water capacity harm. In certain embodiments, system voltage reaches 800 kilovolts, for example, and between 2 or 3 kilovolts to 500 or 800 kilovolts.
In certain embodiments, electrical equipment is power transformer or motor. These are examples that the present invention can be applicable to the fluid insulation electrical equipment using.
In certain embodiments, electrical equipment is the tap changer of carrying that has for power transformer. Tap changer is the particular instance that is contemplated that the present invention can be especially useful. The tap changer of power transformer is partially or even wholly placed in independent container conventionally, and its internal flow does not contact with the cellulose insulation thing of power transformer or can't help its impact. This is the reason that particularly uses water adsorbent element in tap changer, because effective or as effective like that for example, in the cellulose (paper) of several (, hundreds ofs or several thousand) kilogram when the dehydrating breather in transformer tank can not combine work as it. Then the cellulose insulation thing of power transformer can control wetting balance. In tap changer, conventionally may be without any cellulose (paper), because it may not be applicable insulant wherein, because it can produce wear debris by the Mechanical Moving by tap changer, and the relatively high risk of moisture in cellulose in tap changer may be very bad in tap changer. Because tap changer does not comprise paper conventionally, therefore even fluid space wherein relatively easily by little moisture effects, this is why dry cellulosic or other absorbent material can be introduced according to reason especially useful in tap changer of the present invention. Therefore, advantageously can for example use cellulose in as tap changer at equipment, wherein absorbent material needn't have dielectric insulation performance, is mainly used in moisture absorption but can change into.
In some embodiment, electrical insulation fluids is or comprises oil, as mineral oil or ester oil. In certain embodiments, based on the fluid of ester, normally the liquid based on ester is as ester oil, can rely on its higher heat resistance but preferred. Electrical insulation fluids can be the conventional iknsulating liquid (for example, oil) for the transformer of liquid filling or other electrical equipment. As above also mentioned, in background parts, insulative dielectric fluid is as the oil based on oil and the known electrical insulation fluids that is used as of ester liquid. Therefore, those skilled in the art depends on that the type of electrical equipment and its operating condition (for example, operating temperature) select the applicable electrical insulation fluids will be without any problem.
In certain embodiments, water adsorbent element comprises water absorbent polymer material, as, for example, based on cellulose (, Paper or cardboard), based on polyacrylamide or the absorbent material based on silica (silica gel/pearl), or cotton or clay. These are examples of spendable hygroscopic material. In some embodiments of the invention, water adsorbent element is also arranged to remove/trap particle from electrical insulation fluids. Cellulose is the example that also traps the absorbent material of particle. Absorbent material is known in the art, for example, and the document of mentioning from above background parts. The applicable attribute of water adsorbent element, as cellulose type, molecular weight, granularity etc., is known from commercially available water suction product (also referred to as drier). Technical staff can be based on present disclosure, for example, depend on attribute, the attribute of electrical insulation fluids and/or the operating condition of electrical equipment of waterproof material, finds other material that also may be applicable to. Substantially, water adsorbent element can be included at all operations temperature of electrical equipment, have with dielectric fluid compared with all there is significantly higher hydrophily. The amount of the absorbent material in water adsorbent element for example depends on the free space in electrical equipment. The absorbent material using is more, and the service time of the water adsorbent element that can absorb water in being used in electrical equipment before it for example needs to change is just more of a specified duration. Conventionally, the absorbing material of same amount can be used as the conventional water adsorbent element for electrical equipment now, may be even still less, because by means of the present invention, water adsorbent element has not been that part is full of water before contact dielectric fluid. For instance, can use 0.5% to 5% the absorbent material amount corresponding to the volume of the electrical insulation fluids in electrical equipment. In certain embodiments, water adsorbent element can absorb the water of (between 0.1 to 1 liter) between 0.01 to 1 liter of electrical insulation fluids of every cubic metre. This represents that water adsorbent element exists with a certain amount of/size, makes can absorb so many moisture under the operating condition of electrical equipment. Certainly, multiple independent water adsorbent element can be present in same equipment.
Substantially, all terms that use in claim are all understood according to its common meaning of technical field, unless clearly limited in addition in this article. All "/one/this element, equipment, member, device, step etc. " that mention open and are interpreted as at least one example that represents element, equipment, member, device, step etc., unless pointed out in addition clearly. The step of any method as herein described all needn't be carried out with disclosed accurate order, unless explicitly stated otherwise. " first ", " second " etc. that use for the different characteristic/member of present disclosure are only intended to feature/member and other similar feature/member to distinguish, and do not give any order or grade to feature/member.
Brief description of the drawings
To with reference to accompanying drawing, embodiment be described by way of example, in the accompanying drawings:
Fig. 1 is according to the schematic block diagram of the embodiment of power transformer of the present invention;
Fig. 2 is according to the schematic diagram of the embodiment of tap changer of the present invention.
Detailed description of the invention
Now will more completely with reference to accompanying drawing, embodiment be described hereinafter, shown in the drawings of some embodiment. But being many other multi-form embodiment may be in the scope of present disclosure. On the contrary, following examples by way of example mode provide, so that present disclosure will be thorough and complete, and the scope of present disclosure are conveyed to those skilled in the art completely. Similar numeral represents similar components everywhere in description.
Electrical equipment is defined as any equipment that is configured to be connected to electric current/conductive electric current here.
Fig. 1 is to be the sketch of the embodiment of the electrical equipment of the present invention of the form of power transformer 1 here. Power transformer 1 has the housing 2 that holds the electric part that is immersed in the power transformer in dielectric fluid 3. For example, according to its any embodiment as herein described, electrical insulation fluids 3 is mineral oil or the liquid based on ester. At the top place of power transformer 1, gas (for example, air) phase 6 can be present in housing and the top face of liquid fluid 3. The electric part of power transformer 1 comprise held by the coil/winding 5 of electric lead 8 and 10 metal-cored 4. Tap changer (13 places schematically show) can be used for being switched to the diverse location in winding 5, for adjusting the voltage of power transformer 1. Tap changer 13 comprises compartment, and its remainder by the dielectric fluid 3 in the dielectric fluid in tap changer and transformer 1 separates. In the diagram of simplifying very much of accompanying drawing, the electric lead 8 entering enters in housing 2 via sleeve pipe 7, and the electric lead 10 leaving leaves housing 2 via sleeve pipe 10. Wherein use transformer 1 or other electrical equipment of this fluid 3 for example to can be high temperature or high-tension electricity transformer, or high-tension motor or other high-tension apparatus, it is arranged to operate at the temperature of the normal running temperature of the dielectric fluid higher than mineral oil derived, for example,, higher than 160 DEG C, 180 DEG C or higher than the operating temperature of 200 DEG C.
In transformer 1, water adsorbent element 11 is positioned to contact with electrical insulation fluids 3. Water adsorbent element 11 (for example also can be described as dehydrating breather) can be positioned on any position in electrical equipment 1, and at this place, it can absorb moisture easily, and does not hinder the normal operating of equipment 1. According to some embodiments of the present invention, water adsorbent element also can act as filter or grain catcher, for trapping and therefore remove the particle from dielectric fluid 3. Also by except degranulation, the wearing and tearing of equipment can reduce, because particle can be absorbed in the movable part of equipment and cause friction. Remove moisture and may change the previous time except degranulation can extend dielectric fluid 3. For instance, water adsorbent element 11 can be positioned at the tap changer of power transformer 1, to keep fluid 3 wherein dry in time expand section. As described above, electrical equipment 1 can not be to be always filled with dielectric fluid 3 yet. On the contrary, it can not have the situation transport of fluid, and fluid can add subsequently in the time that equipment investment operation is used thus. Therefore, for example, in fluid (, oil) 3 adds equipment 1 before, in the time that water adsorbent element can add or be dry, from manufacture or the maintenance of equipment, can there is the long period. During at this moment, the risk of existence is, water adsorbent element 11, for example from the absorption of air moisture around it (, water), has therefore reduced the ability that water adsorbent element 11 is used for its expectation from dielectric fluid 3 moisture absorptions.
According to the present invention, water adsorbent element 11 is associated from the waterproof material 12 of its surrounding environment water suction with stoping/prevent water adsorbent element. For example, water adsorbent element 11 can be coated with by waterproof material 12, or is otherwise enclosed in waterproof material 12, or it can be soaked with waterproof material 12. Interrelational form between waterproof material 12 and water adsorbent element 11 can be selected by the attribute of waterproof material 12 based on selecting. Polymers/plastics waterproof material 12 for example can manufacture water adsorbent element 11 can be enclosed in packaging or film wherein. For example, wax or lipid can be suitable for being coated on the surface of water adsorbent element 11, or are impregnated in water adsorbent element 11 (if the porous material of water adsorbent element 11 for being applicable to soak into, for example, cellulosic material, as Paper or cardboard). According to the present invention, waterproof material 12 may be dissolved in dielectric fluid 3, and equipment 1 is configured to be filled with this dielectric fluid 3. Once this expression equipment fill fluid 3; fluid 3 contacts the water adsorbent element 11 of being protected by waterproof material 12; waterproof material 12 starts to be dissolved in dielectric fluid, finally no longer stops/prevent water adsorbent element from its surrounding medium water suction (comprise now dielectric fluid or be made up of dielectric fluid). Conventionally, then water adsorbent element 11 is immersed in dielectric fluid 3 completely, but in certain embodiments, it can be only therein partially submerged. Then water adsorbent element 11 freely carries out its expectation function from dielectric fluid moisture absorption, and if comparable its part be for example full of in the situation from the moisture of air and done so the longer time.
Fig. 2 schematically shows the embodiment of the tap changer 13 of present disclosure. Tap changer is configured in power transformer 1, for switching between the different taps in the winding of transformer. Tap changer 13 comprises housing 22, and it surrounds tap changer to form the outer surface of tap changer, but still allows the part (for example, the part of switch 23) of tap changer to extend to outside housing 22. The housing 22 of tap changer 13 is filled with electric insulation liquid 3, for example mineral oil or ester oil. Tap changer is configured to be positioned in transformer, make the switch 23 of tap changer 13 be arranged in the bottom section place of tap changer, in housing 22, dielectric fluid 3 can be heated by the electric member of for example switch thus, and in the interior rising of housing 22. Heat and therefore in the interior rising of housing 2, in the housing of tap changer, just realized the Natural Circulation of fluid by fluid 3. This Natural Circulation causes fluid 3 stream 25 upwards, and adjacent downward stream 27. In the embodiment of Fig. 2, stream 25 upwards produces in center along the central longitudinal axis of housing 22, and downward stream 27 more periphery is positioned at housing 22 (cylindrical if housing is similar to) simultaneously. Also the water adsorbent element 11 that can be used as grain catcher is positioned in housing 22, makes its interception fluid stream 3, allows at least a portion of stream through water adsorbent element 11. According to the present invention, water adsorbent element 11 was protected by waterproof material 12 before being immersed in dielectric fluid 3, and then waterproof material 12 is dissolved by fluid 3, allowed thus fluid to contact with the absorbent material of water adsorbent element 11. Water adsorbent element/grain catcher 11 can be tackled the stream upwards 25 of fluid 3 and/or downward stream 27. Water adsorbent element/grain catcher needn't be tackled whole stream 25 or 27, but expects interception as much as possible, to realize effective moisture and/or particle is removed. Even if an only part (may be smaller portions) for the stream of fluid up or down is through water adsorbent element/grain catcher 11, it is also enough to remove moisture/particle from fluid 3, because Natural Circulation and therefore to flow through water adsorbent element/grain catcher be continuous or occur for each tap-change. Water adsorbent element 11 can be passive grain catcher, and it allows fluid 3 to flow through it, granule capturing thus/be deposited in water adsorbent element. Water adsorbent element 11 for example can comprise filter, and it depends on and mechanically trap particle for the material of filter, and/or with the mode of static or otherwise in conjunction with or adsorption particle. In addition or as alternative, water adsorbent element can comprise labyrinth part, it comprises the material that traps particle, for example, and with the mode of static or combination/adsorption particle otherwise. As described above, also can at least to a certain degree trap particle for the absorbent material of water adsorbent element 11. As fruit instant, additional granule capturing material or function also can be used in water adsorbent element 11. Therefore, water adsorbent element 11 can be removed moisture and particle from fluid 3, has further extended the life-span of dielectric fluid 3 and tap changer 13. Due to do not use pump and circulation only (or at least main) undertaken by Natural Circulation, therefore larger particle can allow to be deposited in tap changer, at this place, they may be harmless, because they not with Fluid Circulation, and can not be deposited on the solid insulating material in tap changer. Therefore, water adsorbent element 11 can mainly be arranged to the granule that trapping can not deposit. This has also extended the service life of water adsorbent element, because if less bulky grain traps, it just needs more of a specified duration by the Particle Blocking trapping. The applicable material that can be used for trapping in the water adsorbent element 11 of moisture and particle is cellulose, but those skilled in the art also can know the absorbent material that other is applicable, and it also can trap particle from dielectric fluid 3 to a certain extent.
In the embodiment shown in Fig. 2, fluid 3 is mainly heated by least one transition resistor 28 between 23 transfer periods of switch, the center that causes fluid stream 25 upwards. In the time that stream 25 upwards is upwards advanced, fluid is wherein cooling, produces the downward stream 27 of periphery. Optionally, can be used for additionally cooling fluid 3 at the heat exchanger (not shown) at tap changer 13 top places.
In the embodiment shown in Fig. 2, guiding piece 29 is for additionally guiding to stream upwards 25 and/or downward stream 27 water adsorbent element 11 and control Natural Circulation. For example, guiding piece 9 Rotational Symmetry substantially, to form prone funnel. In Fig. 2, show the Natural Circulation of stream 25 upwards and downward stream 27 with arrow. As can be seen, stream 25 and 27 substantially parallel and contiguous each other, but in opposite direction. But, at stream 25 upwards during through infundibulate guiding piece 29, guiding piece 29 can be for example by concentrating stream 25 upwards to guide stream 25 upwards and/or downward stream 27, this arrow by the stream upwards 25 in the funnel 29 in Fig. 2 illustrates. In the time that stream 25 upwards arrives the top of housing 22, the fluid 3 of Natural Circulation is cooling, may be also assisted by the cooling heat exchanger at the top place of housing, and has formed a part for downward stream 27. Downward stream 27 than concentrate to upper reaches 25 in periphery more, and therefore by outside interception and the guiding of infundibulate guiding piece 29. Downward stream 27 is guided to water adsorbent element 11 by guiding piece 29, and this element 11 is attached to the outside of guiding piece 29 in the embodiment of Fig. 2. Water adsorbent element 11 may be also Rotational Symmetry substantially, and attached along the circumference of funnel 29.
In the exemplary embodiment, the water adsorbent element 11 (may also be used as grain catcher) in Fig. 2 is attached on guiding piece 29, and guiding piece 29 guides the downward stream 27 of the fluid 3 of Natural Circulation. In this embodiment, water adsorbent element 11 is labyrinth form, and at least a portion of downward stream 27 is through this labyrinth part. Labyrinth part can comprise the material that is applicable to moisture absorption and/or trapping particle (especially granule, as, galling particle), as, cellulose.
According to an aspect of the present invention, provide a kind of method. The method is carried out in the embodiment of the tap changer 13 of present disclosure. The heat that a part for electrical insulation fluids 3 is generated by the transition resistor 28 of the electric switch in tap changer 13 heats, and the stream upwards 25 of electrical insulation fluids produces by the Natural Circulation of the electrical insulation fluids in tap changer thus. Stream 25 is upwards by the inner side interception and the guiding that are arranged to prone infundibulate guiding piece 29 in tap changer 13, and stream is upwards by concentrating through infundibulate guiding piece thus. Cooling above the infundibulate guiding piece 29 of stream 25 upwards in tap changer 13, the downward stream 27 of electrical insulation fluids 3 produces by the Natural Circulation of the electrical insulation fluids in tap changer thus. Downward stream 27 is by outside interception and the guiding of infundibulate guiding piece 29, and described downward stream is guided by guiding piece thus, makes at least a portion of downward stream through the water adsorbent element 11 in tap changer 13. At least some particles and the moisture that are carried by the downward stream 27 in water adsorbent element 11 can be captured, thereby remove described particle from electrical insulation fluids 13.
In some embodiment of present disclosure, electric switch 23 comprises at least one transition resistor 28, and wherein, in the time that tap changer is in use, the heat that Natural Circulation is generated by described at least one resistor causes at least in part. Resistance is for switch, so that in the step short circuit that does not make the winding transformer in the time that a tap changes to another tap. This resistance is called transition resistance, and at each tap changer place Heat of Formation, therefore causes Natural Circulation as herein described. In addition or as alternative, more continuous resistance can be used for giving more continuous heating and Natural Circulation, but this need to utilize higher energy. According to present disclosure, transition resistance is enough to give sufficient circulation, but is for example also possible by means of the additional heating of the heating element heater at the bottom section place of tap changer, and can in some embodiment of present disclosure, use.
In some embodiment of present disclosure, guiding piece 29 is positioned in housing 22, and is arranged to the stream of the electrical insulation fluids being caused by Natural Circulation 3 25,27 to guide to water adsorbent element 11 (also may be used as grain catcher).
In certain embodiments, guiding piece 29 is infundibulate. In certain embodiments, infundibulate guiding piece 29 is arranged to the stream upwards 25 of collection and concentrated electrical insulation fluids, and stream 25 is upwards then cooling, and is formed to the downward stream 27 of the outside intercept type water adsorbent element 11 that is positioned at infundibulate guiding piece. In certain embodiments, water adsorbent element 11 is attached on guiding piece 29.
In some embodiment of present disclosure, water adsorbent element 11 is the form of filter and/or labyrinth part.
In some embodiment of present disclosure, water adsorbent element 11 comprises the cellulose for trapping moisture and/or particle.
In some embodiment of present disclosure, water adsorbent element 11 is configured to trapping and has the granule of the typical size that is less than 100 μ m, is not clarification particle, but most of particle will be less than 10 μ m or 1 μ m even. But the size of unclarified particle depends on the fluid viscosity of use and actual grain density.
In some embodiment of present disclosure, tap changer 13 is configured in the power transformer of the system voltage with at least 1 kilovolt. Higher voltage will increase the needs of dielectric power and clean surface, therefore except degranulation has higher significant.
Some other sides of present disclosure are below paid close attention to.
According to aspects of the present invention, a kind of method of removing moisture and particle from the electrical insulation fluids 3 of the tap changer 13 for power transformer 1 is provided, the method comprises: the heat of utilizing the resistor 28 of the electric switch 23 in tap changer to generate heats a part for electrical insulation fluids, and the stream upwards of electrical insulation fluids produces by the Natural Circulation of the electrical insulation fluids in tap changer thus; Described in permission, stream is upwards tackled by the inner side that is arranged in prone infundibulate guiding piece 29 in tap changer, and stream is upwards by concentrating through infundibulate guiding piece thus; The stream upwards of the infundibulate guiding piece top in cooling tap changer, downward the flowing through of electrical insulation fluids produced by the Natural Circulation of the electrical insulation fluids by tap changer thus; Allow described downward stream to be tackled by the outside of infundibulate guiding piece 29, described downward stream is guided by guiding piece thus, makes at least a portion of downward stream through the water adsorbent element 11 in tap changer; And trap at least some particles that carried by the downward stream in water adsorbent element 11, thereby remove described particle (and moisture) from electrical insulation fluids.
According to the aspect of present disclosure, a kind of tap changer 13 for power transformer 1 is provided, tap changer comprises: for utilizing the device of a part of the heat heating electrical insulation fluids 3 that the electric switch 23 of tap changer generates, the stream upwards 25 of electrical insulation fluids produces by the Natural Circulation of the electrical insulation fluids in tap changer thus; For the device of cooling stream 25 upwards, the downward stream 27 of electrical insulation fluids 3 produces by the Natural Circulation of the electrical insulation fluids in tap changer thus; And for trapping the device of at least some particles that carried by the stream upwards in the water adsorbent element 11 of tap changer and/or downward stream, by it, be captured particle and/or because Natural Circulation is through wherein of at least a portion of stream, thus remove described particle (and moisture) from electrical insulation fluids.
According to the aspect of present disclosure, a kind of tap changer 13 for power transformer 1 is provided, tap changer comprises: form the housing 22 in the outside of tap changer, described casing structure becomes to be filled with electrical insulation fluids 3; Be positioned at least in part in housing and be configured to the electric switch 23 switching between the different taps of Transformer Winding; Water adsorbent element 11, it is positioned in housing, makes it by the stream of the electrical insulation fluids that interception is caused by the Natural Circulation of described electrical insulation fluids in the time that tap changer is in use.
By means of embodiments of the invention, water adsorbent element 11 can be used for not only removing moisture, but also for example, dielectric fluid 3 from electrical equipment (, the tap changer of transformer) removes degranulation at least to a certain extent. Advantageously can also come from electrical insulation fluids 3 (normally liquid, as mineral oil or ester oil) except degranulation by the Natural Circulation of the fluid with in tap changer 13. Therefore, do not need pump for making Fluid Circulation pass for example particulate filter, and also without any need for closed circuit. As an alternative, according to present disclosure, Natural Circulation produces stream in tap changer, this stream can be tackled and be passed water adsorbent element 11 by water adsorbent element 11, and water adsorbent element 11 can also trap particle, for example, comprise filter or the labyrinth part of granule capturing (for example, absorbing) material. Natural Circulation is illustrated in the situation that there is no pumping and realizes and circulating. On the contrary, Natural Circulation is caused by the thermograde in the fluid combining with Action of Gravity Field. In the time that fluid is for example heated as the heat loss of transition resistor 28 by the electric member in tap changer, the fluid that the density of fluid reduces and heated will rise, thereby also allow colder fluid to decline in tap changer. The fluid stream being caused by Natural Circulation then can be by tackling according to the water adsorbent element 11 of present disclosure and through water adsorbent element, and do not need extra pump and closed circuit. Present disclosure main with reference to some embodiment describe hereinbefore. But if those skilled in the art are by easily recognizing, other embodiment except more above-disclosed equally may in the scope of the present disclosure being limited by appended Patent right requirement.
Claims (20)
1. one kind is configured to comprise the electrical equipment (1) of electrical insulation fluids (3); described electrical equipment comprises the water adsorbent element (11) by waterproof material (12) protection; described waterproof material (12) stops described water adsorbent element from its surrounding environment water suction, and described waterproof material can be dissolved by described electrical insulation fluids.
2. electrical equipment according to claim 1, is characterized in that, described water adsorbent element (11) is soaked with described waterproof material (12).
3. electrical equipment according to claim 1, is characterized in that, described waterproof material (11) is enclosed in the packaging or film of being made up of described waterproof material (12).
4. electrical equipment according to claim 1, is characterized in that, described waterproof material (12) adheres on the surface of described water adsorbent element (11).
5. electrical equipment according to claim 1, is characterized in that, described water adsorbent element is enclosed in the waterproof cover being held in place by means of described waterproof material.
6. according to the electrical equipment described in any aforementioned claim, it is characterized in that, guiding piece (29) is positioned in described electrical equipment (1), and be arranged to the stream of described electrical insulation fluids (3) (25,27) to guide to described water adsorbent element (11).
7. electrical equipment according to claim 6, is characterized in that, described guiding piece (29) is arranged to the stream (25,27) that guides the Natural Circulation of described electrical insulation fluids (3) to cause.
8. according to claim 6 or electrical equipment claimed in claim 7, it is characterized in that, described guiding piece (29) is infundibulate.
9. electrical equipment according to claim 8, it is characterized in that, described infundibulate guiding piece (29) is arranged to collect and concentrate the stream upwards (25) of described electrical insulation fluids (3), and described stream (25) is then cooled and is formed to the downward stream (27) of the outside intercept type water adsorbent element (11) that is positioned at infundibulate guiding piece.
According to claim 6 to the electrical equipment described in any one in claim 9, it is characterized in that, described water adsorbent element (11) is attached on described guiding piece (29).
11. according to the electrical equipment described in any aforementioned claim, it is characterized in that, described water adsorbent element (11) is configured to trap the particle in described electrical insulation fluids (3) in the time being immersed in described electrical insulation fluids (3).
12. according to the electrical equipment described in any aforementioned claim, it is characterized in that, described waterproof material (12) was dissolved completely by described electrical insulation fluids (3) under the routine operation condition of described electrical equipment (1) in one week, as in 48 or 24 hours.
13. according to the electrical equipment described in any aforementioned claim, it is characterized in that corroding metal not when described waterproof material (12) is being dissolved in described electrical insulation fluids (3) under the operating condition of described electrical equipment (1).
14. according to the electrical equipment described in any aforementioned claim, it is characterized in that, described waterproof material (12) is wax or lipid, as vaseline, or synthetic or natural polymer, or mineral oil or the material based on ester.
15. according to the electrical equipment described in any aforementioned claim, it is characterized in that, described electrical equipment (1) is a part with the system of the system voltage of at least 1000 volts or at least 1500 volts.
16. according to the electrical equipment described in any aforementioned claim, it is characterized in that, described electrical equipment (1) is power transformer or motor.
17. according to claim 1 to the electrical equipment described in any one in claim 14, it is characterized in that, described electrical equipment (1) is the tap changer of carrying that has for power transformer.
18. according to the electrical equipment described in any aforementioned claim, it is characterized in that, described electrical insulation fluids (3) for or comprise oil, as, mineral oil or ester oil.
19. according to the electrical equipment described in any aforementioned claim, it is characterized in that, described water adsorbent element (11) comprises water absorbent polymer material, as, based on cellulose, based on polyacrylamide or the absorbent material based on silica, or cotton or clay.
The method that 20. 1 kinds of electrical insulation fluids from the tap changer for power transformer (1) (13) (3) are removed moisture and particle, described method comprises:
The heat of utilizing the electric switch (23) in described tap changer to generate heats a part for described electrical insulation fluids, and the stream upwards of described electrical insulation fluids produces by the Natural Circulation of the electrical insulation fluids in described tap changer thus;
Cooling stream upwards, the downward stream of described electrical insulation fluids produces by the Natural Circulation of the electrical insulation fluids in described tap changer thus; And
At least some particles that trapping is carried by the stream upwards in the water adsorbent element in described tap changer (11) and/or downward stream, stream at least a portion because Natural Circulation is passed described water adsorbent element, thereby remove described particle and moisture from described electrical insulation fluids.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP13164089.8 | 2013-04-17 | ||
| EP13164089 | 2013-04-17 | ||
| PCT/EP2014/057514 WO2014170263A1 (en) | 2013-04-17 | 2014-04-14 | Moisture absorber in electrical equipment |
Publications (2)
| Publication Number | Publication Date |
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| CN105612586A true CN105612586A (en) | 2016-05-25 |
| CN105612586B CN105612586B (en) | 2017-10-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480034509.6A Active CN105612586B (en) | 2013-04-17 | 2014-04-14 | Dehydrating breather in electrical equipment |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2987171B1 (en) |
| CN (1) | CN105612586B (en) |
| WO (1) | WO2014170263A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110534307A (en) * | 2019-09-20 | 2019-12-03 | 江苏康宇电力设备有限公司 | A kind of transformer oil moisture removal device |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170252721A1 (en) * | 2016-03-07 | 2017-09-07 | Virginia Transformer Corporation | Transformer oil moisture removing apparatus |
| AT521932A1 (en) * | 2018-12-12 | 2020-06-15 | Siemens Ag | Reduction of aging in the insulation material of a winding, in particular an oil-impregnated high-voltage device |
| DE102020104650A1 (en) | 2020-02-21 | 2021-08-26 | Audi Aktiengesellschaft | Energy storage device and motor vehicle with an energy storage device |
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| EP0481239A1 (en) * | 1990-10-19 | 1992-04-22 | Maschinenfabrik Reinhausen Gmbh | Oil filter, especially for tap changes of step-down transformers |
| US5766464A (en) * | 1995-11-22 | 1998-06-16 | Campbell; David C. | Fluid filtration system positionable within a fluid-containing apparatus |
| JP2010258318A (en) * | 2009-04-28 | 2010-11-11 | Chugoku Electric Power Co Inc:The | Moisture absorption respiratory apparatus |
| CN202134324U (en) * | 2011-06-17 | 2012-02-01 | 平阴县供电公司 | Oil storage cabinet for on-load voltage regulating switch of transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007221047A (en) | 2006-02-20 | 2007-08-30 | Toshiba Corp | Transformer |
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2014
- 2014-04-14 WO PCT/EP2014/057514 patent/WO2014170263A1/en active Application Filing
- 2014-04-14 CN CN201480034509.6A patent/CN105612586B/en active Active
- 2014-04-14 EP EP14717149.0A patent/EP2987171B1/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0481239A1 (en) * | 1990-10-19 | 1992-04-22 | Maschinenfabrik Reinhausen Gmbh | Oil filter, especially for tap changes of step-down transformers |
| US5766464A (en) * | 1995-11-22 | 1998-06-16 | Campbell; David C. | Fluid filtration system positionable within a fluid-containing apparatus |
| JP2010258318A (en) * | 2009-04-28 | 2010-11-11 | Chugoku Electric Power Co Inc:The | Moisture absorption respiratory apparatus |
| CN202134324U (en) * | 2011-06-17 | 2012-02-01 | 平阴县供电公司 | Oil storage cabinet for on-load voltage regulating switch of transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110534307A (en) * | 2019-09-20 | 2019-12-03 | 江苏康宇电力设备有限公司 | A kind of transformer oil moisture removal device |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2987171A1 (en) | 2016-02-24 |
| EP2987171B1 (en) | 2017-01-11 |
| CN105612586B (en) | 2017-10-17 |
| WO2014170263A1 (en) | 2014-10-23 |
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