NO852534L - ELECTRICAL APPLIANCES INSULATION OIL. - Google Patents
ELECTRICAL APPLIANCES INSULATION OIL.Info
- Publication number
- NO852534L NO852534L NO852534A NO852534A NO852534L NO 852534 L NO852534 L NO 852534L NO 852534 A NO852534 A NO 852534A NO 852534 A NO852534 A NO 852534A NO 852534 L NO852534 L NO 852534L
- Authority
- NO
- Norway
- Prior art keywords
- gas
- oil
- specified
- insulating oil
- methyl
- Prior art date
Links
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
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/321—Insulating of coils, windings, or parts thereof using a fluid for insulating purposes only
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/20—Dielectrics using combinations of dielectrics from more than one of groups H01G4/02 - H01G4/06
- H01G4/22—Dielectrics using combinations of dielectrics from more than one of groups H01G4/02 - H01G4/06 impregnated
- H01G4/221—Dielectrics using combinations of dielectrics from more than one of groups H01G4/02 - H01G4/06 impregnated characterised by the composition of the impregnant
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Manufacturing & Machinery (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Organic Insulating Materials (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
- Stringed Musical Instruments (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
- Lubricants (AREA)
Abstract
Description
Oppfinnelsen angår en isolasjonsolje for elektriske apparater, bestående av en basisblanding av 50-95 vektprosent av en mineralolje og 5-50 vektprosent av en gassopptagende dielektrisk væske samt et additiv. The invention relates to an insulating oil for electrical appliances, consisting of a base mixture of 50-95 percent by weight of a mineral oil and 5-50 percent by weight of a gas-absorbing dielectric liquid and an additive.
Elektriske apparater for høye spenninger, eksempelvis kondensatorer, transformatorer, kabler, brytere og måle-transformatorer, blir i alminnelighet fylt med en dielektrisk væske som dels skal forhindre delutladninger i apparatet og dels skal føre bort den tapsvarme som oppstår. Electrical devices for high voltages, for example capacitors, transformers, cables, switches and measuring transformers, are generally filled with a dielectric liquid which is partly to prevent partial discharges in the device and partly to carry away the loss heat that occurs.
Det har vist seg at delutladninger i en isolasjonsvæskeIt has been shown that partial discharges in an insulating liquid
i lengden bare kan forhindres hvis et av væsken omsluttet gassvolum minker under innflytelsen av et elektrisk felt (gassopptagende væske). I motsetning til dette vokser gass-blæren i en gassavspaltende væske under innflytelsen av et elektrisk felt. Disse egenskaper hos isolasjonsvæsken blir betegnet som "gasstendens" (engelsk: gassing tendency). Gasstendensen avhenger av isolasjonsvæskens kjemiske oppbygning, men også av de anvendte feltstyrker. F.eks. kan en isolasjonsvæske ved relativt liten påkjenning fra feltstyrke i transformatorer ennå være gassopptagende, mens den ved svært meget høyere feltstyrkepåkjenning i kondensatorer vil avspalte gass. in length can only be prevented if a gas volume enclosed by the liquid decreases under the influence of an electric field (gas-absorbing liquid). In contrast, the gas bubble in a gas-splitting liquid grows under the influence of an electric field. These properties of the insulating liquid are termed "gassing tendency". The gas tendency depends on the chemical structure of the insulating liquid, but also on the applied field strengths. E.g. can an insulating liquid with relatively small stress from field strength in transformers still absorb gas, while it will release gas at very much higher field strength stress in capacitors.
Som gassopptagende væsker har der i eldre tid hovedsakelig vært benyttet polyklorerte bifenyler (PCB^ som imidlertid senere på grunn av sine helseskadelige virkninger i mange stater er blitt forbudt anvendt i elektriske apparater. In the past, polychlorinated biphenyls (PCBs) have mainly been used as gas-absorbing liquids, which, however, have later been banned from use in electrical appliances in many states due to their harmful effects on health.
En isolasjonsvæske som ofte anvendes istedenfor PCB,An insulating liquid that is often used instead of PCB,
er mineralolje, f.eks. transformatorolje. Denne har riktignok fordelen av å være relativt billig, men vil med tiltagende feltstyrke stadig avspalte mer gass. is mineral oil, e.g. transformer oil. This does have the advantage of being relatively cheap, but with increasing field strength will constantly release more gas.
Der har derfor i den siste tid vært utviklet syntetiske benzolring-rike dielektriske isolasjonsvæsker som imidlertid stadig er gassopptagende ved høyere feltstyrker. Disse væsker har dog den ulempe at de ved anvendelse i f.eks. selvhelbredende kondsensatorer fører til en tydelig minsket spenningsfasthet. Videre ligger prisene i det minste for tiden ca. Synthetic benzene ring-rich dielectric insulating liquids have therefore recently been developed which, however, are still gas-absorbing at higher field strengths. However, these liquids have the disadvantage that when used in e.g. self-healing capacitors lead to a clearly reduced voltage resistance. Furthermore, prices are currently at least approx.
3-5 ganger høyere enn for mineralolje.3-5 times higher than for mineral oil.
Som eksempel på en slik dielektrisk væske med god U^-gassabsorpsjonsevne er der i ETZ bind 104 (1983), side 480-483 angitt en ditolyleter. ETZ volume 104 (1983), pages 480-483 states a ditolyl ether as an example of such a dielectric liquid with good U^ gas absorption capacity.
Et ytterligere eksempel på slike væsker er diarylalkaner, f.eks. fenyl-xylyl-etan (PXE), som fra EP 00 39 546 er kjent som impregneringsmiddel for kondensatorer. Der er det også beskrevet blandinger av di-2-etyl-hexyl-ftalat (DEHP) og PXE med tilsatt epoksidstabilisator. A further example of such liquids are diarylalkanes, e.g. phenyl-xylyl-ethane (PXE), which is known from EP 00 39 546 as an impregnating agent for capacitors. Mixtures of di-2-ethylhexyl phthalate (DEHP) and PXE with added epoxide stabilizer are also described there.
Det har også allerede vært forsøkt å kombinere fordelene ved mineralolje med dem ved syntetiske, gassopptagende isolasjonsvæsker, idet disse stoffer blir blandet. Riktignok iakttar man allerede ved de feltstyrker som opptrer i kondensatoren ved blandingsforhold med mer enn 50 vektprosent mineralolje-ande^ at den ugunstige gasstendens av mineraloljen melder seg i forsterket grad, og fra og med et innhold av ca. 60 vektprosent mineralolje er væskene ikke lenger gassopptagende, men gassavgivende. Det er derfor nødvendig ved slike blandinger å påse at mineraloljeandelen blir holdt under 50 vektprosent, så den prismessige fordel ved mineraloljen bare gjør seg gjeldende i svakere grad, og spenningsfastheten av f.eks. selvhelbredende kondensatorer blir sterkt redusert. Attempts have also already been made to combine the advantages of mineral oil with those of synthetic, gas-absorbing insulating fluids, these substances being mixed. Admittedly, one already observes from the field strengths that appear in the condenser at mixing ratios with more than 50% by weight of mineral oil spirit^ that the unfavorable gas tendency of the mineral oil manifests itself to an increased degree, and from a content of approx. 60% mineral oil by weight, the liquids are no longer gas-absorbing, but gas-emitting. It is therefore necessary for such mixtures to ensure that the mineral oil proportion is kept below 50% by weight, so that the price advantage of the mineral oil is only felt to a lesser extent, and the tensile strength of e.g. self-healing capacitors is greatly reduced.
Oppfinnelsens oppgave er å gi anvisning på en elektro-isolasjonsolje som består av en blanding av mineralolje og en syntetisk gassopptagende isolasjonsolje, og hvor andelen av mineraloljen kan utgjøre vesentlig mer enn 50 vektprosent uten at væsken mister sin gassopptagende karakter. The task of the invention is to provide instructions for an electro-insulating oil which consists of a mixture of mineral oil and a synthetic gas-absorbing insulating oil, and where the proportion of the mineral oil can be significantly more than 50% by weight without the liquid losing its gas-absorbing character.
Denne oppgave blir ifølge oppfinnelsen løst ved at der til basisblandingen er satt et additiv som består av et antioksidasjonsmiddel og/eller en epoksidstabilisator og/eller en metalldesaktivato^ og at der til 100 g basisblanding settes 0,1-5 g additiver. According to the invention, this task is solved by adding an additive consisting of an antioxidant and/or an epoxide stabilizer and/or a metal deactivator to the base mixture, and adding 0.1-5 g of additives to 100 g of the base mixture.
Dermed oppnås den fordel at slike isolasjonsstoffers gasstendens blir betraktelig forbedret. Takket være den til-blanding av additiver som oppfinnelsen gir anvisning på, blir det mulig å øke andelen av mineralolje betraktelig. The advantage is thus achieved that the gas tendency of such insulating materials is considerably improved. Thanks to the addition of additives that the invention provides, it becomes possible to increase the proportion of mineral oil considerably.
Til tross for omkostningene til additivene blir resultatetDespite the cost of the additives, the result is
en lavere pris på isolasjonsvæskene. En ytterligere fordel ved slike blandinger sammenholdt med syntetiske gassopptagende a lower price for the insulation fluids. A further advantage of such mixtures compared to synthetic gas absorbers
væsker består i at de gir en vesentlig høyere spenningsfasthet i selvhelbredende kondensatorer, så de ved disse kan bli å foretrekke som impregneringsmidler. liquids consist in the fact that they provide a significantly higher voltage resistance in self-healing capacitors, so they may be preferred as impregnation agents.
Som antioksidasjonsmidler egner seg additiver på basis av sterisk hindrende fenoler som f.eks. a) 1,3,5-tri-metyl-2,4,6-tris-3,5-di-tert-butyl-4-hydroksy-benzyl-benzol, Additives based on sterically hindered phenols such as e.g. a) 1,3,5-tri-methyl-2,4,6-tris-3,5-di-tert-butyl-4-hydroxy-benzyl-benzene,
b) 2,6-di-tert-butyl-4-metyl-fenol ellerb) 2,6-di-tert-butyl-4-methyl-phenol or
c) alkylerte fenyl-a-naftaliner.c) alkylated phenyl-a-naphthalenes.
Der kan også anvendes antioksidasjonsmidler på aminisk Aminic antioxidants can also be used
basis, f.eks.base, e.g.
a) di-tert-amin-hydrokinon ellera) di-tert-amine-hydroquinone or
b) fenyl-a-naftylamin.b) phenyl-α-naphthylamine.
Epoksidstabilisatoren kan f.eks. bestå av 2,2-bis(4-oksi-2-metyl-oksiranyl-fenyl)-propan, og som metalldesaktivator kan man benytte et triazol-derivat som f.eks. benzotriazol eller metyl-benzyl-triazol. The epoxy stabilizer can e.g. consist of 2,2-bis(4-oxy-2-methyl-oxiranyl-phenyl)-propane, and as a metal deactivator you can use a triazole derivative such as benzotriazole or methyl-benzyl-triazole.
Foretrukne gassopptagende væsker består av molekylerPreferred gas absorbing liquids consist of molecules
som er sammenknyttet innbyrdes direkte eller via et radikal, eventuelt delvis substituerte benzolringer. which are interconnected directly or via a radical, possibly partially substituted benzene rings.
Eksempler på syntetiske benzolringrike og derfor gassopptagende væsker er foruten de allerede nevnte ditolyletere og PXE, f.eks. en blanding av mono- og dibenzyltoluen eller isopropyl-bifenyl og etyl-difenyl-metan. Examples of synthetic benzene ring-rich and therefore gas-absorbing liquids are, in addition to the already mentioned ditolyl ethers and PXE, e.g. a mixture of mono- and dibenzyltoluene or isopropyl-biphenyl and ethyl-diphenyl-methane.
I det følgende vil der i forbindelse med utførelses-eksempler bli anført gunstige blandinger av isolasjonsvæsker. In the following, favorable mixtures of insulating liquids will be listed in connection with design examples.
Tegningen anskueliggjør grafisk gasstendensen hos blandede isolasjonsvæsker uten og med tilsatte additiver. The drawing graphically illustrates the gas tendency of mixed insulating fluids without and with added additives.
Utførelseseksempel 1:Execution example 1:
Til sammenligning ble det undersøkt hvorledes en basisblanding av mineralolje og ditolyleter forholdt seg ved tiltagende innhold av mineralolje. Gasstendensen av disse blandinger er gjengitt som kurve 1 på figuren, hvor prosentverdiene på abscissen refererer seg til andelen av mineralolje. For comparison, it was investigated how a base mixture of mineral oil and ditolyl ether behaved with increasing content of mineral oil. The gas tendency of these mixtures is shown as curve 1 in the figure, where the percentage values on the abscissa refer to the proportion of mineral oil.
Som målemetode for gasstendensen valgte man "MethodeAs the measurement method for the gas tendency, the "Method
B" som er beskrevet i IEC-dokument 10 A (Sekretariat) 75. B" which is described in IEC document 10 A (Secretariat) 75.
Målespenningen i forhold til "Methode B" ble imidlertid høynet fra 12 kV til 16 kV. Dette betyr en betraktelig skjerpelse av prøvepåkjenningen, men på den annen side ligger spennings-påkjenningen f.eks. i kondensatorer enda vesentlig høyere. However, the measuring voltage in relation to "Method B" was raised from 12 kV to 16 kV. This means a considerable tightening of the test stress, but on the other hand, the tension stress is e.g. in capacitors even significantly higher.
Som ordinat på figuren er angitt verdier (Skt.) fra skalaenValues (Skt.) from the scale are indicated as the ordinate on the figure
på måleapparaturet, hvorav positive verdier betyr gassavgivelse og negative verdier betyr gassopptak. on the measuring equipment, of which positive values mean gas release and negative values mean gas absorption.
Som det fremgår av kurve 1, har mineraloljeandeler under 50 vektprosent ved den nevnte prøvespenning ingen innvirkning på "basisblandingens gassopptakstendens. Over 50 vektprosent mineraloljeandel forringes gassopptaket vesentlig. Fra et mineraloljeinnhold på ca. 65 vektprosent opptar basisblandingen ikke lenger gass, men vil i tiltagende grad avgi gass. As can be seen from curve 1, mineral oil proportions below 50% by weight at the aforementioned test voltage have no effect on the gas absorption tendency of the base mixture. Above 50% by weight of mineral oil, the gas absorption deteriorates significantly. From a mineral oil content of approx. 65% by weight, the base mixture no longer absorbs gas, but will increasingly give off gas.
Utførelseseksempel 2:Execution example 2:
Pr. 100 g basisblanding ifølge utførelseseksempel 1 ble der tilsatt 0,3 g epoksistabilisator (2,2-bis-(4-oksi-2-metyl-oksiranyl-fenyl)-propan) og et aminisk antioksidasjonsmiddel (di-tert-amin-hydrokinon). Denne blandings gasstendensn s er gjengitt ved kurve 2 på figuren. Per 100 g of base mixture according to embodiment 1, 0.3 g of epoxy stabilizer (2,2-bis-(4-oxy-2-methyl-oxiranyl-phenyl)-propane) and an amine antioxidant (di-tert-amine- hydroquinone). The gas tendency of this mixture is shown by curve 2 in the figure.
Utførelseseksempel 3:Execution example 3:
Pr. 100 g basisblanding ifølge utførelseseksempel 1Per 100 g of base mixture according to design example 1
ble der tilsatt 0,5 g antioksidasjonsmiddel på basis av sterisk hindrede fenoler (alkylert fenyl-a-naftalin) og 0,05 g triazol-derivat (f.eks. benzotriazol) som metall-desaktivator. Disse blandingers gasstendens er angitt ved kurve 3 på figuren. 0.5 g of an antioxidant based on sterically hindered phenols (alkylated phenyl-a-naphthalene) and 0.05 g of a triazole derivative (e.g. benzotriazole) were added there as a metal deactivator. The gas tendency of these mixtures is indicated by curve 3 in the figure.
Utførelseseksempel 4:Execution example 4:
Pr. 100 g basisblanding ifølge utførelseseksempel 1Per 100 g of base mixture according to design example 1
ble der tilsatt 0,35 g fenyl-a-naftylamin som aminisk anti-oksidas jonsmiddel og 0,15 g 2,6-di-tert-butyl-4-metyl-fenol som fenolisk antioksidasjonsmiddel. Disse blandingers gasstendens er vist ved kurve 4 på figuren. 0.35 g of phenyl-α-naphthylamine was added there as an aminic antioxidant and 0.15 g of 2,6-di-tert-butyl-4-methyl-phenol as a phenolic antioxidant. The gas tendency of these mixtures is shown by curve 4 in the figure.
Som det kan utledes av utførelseseksemplene og den til-hørende tegning, er det mulig ved tilsetningene i samsvar med oppfinnelsen å styre gassblandingens gasstendens slik at der opp til mineraloljeinnhold over 90 vektprosent er sikret gassopptak. Dette overraskende forhold, nemlig at det ved hjelp av den ifølge oppfinnelsen foreskrevne tilsetning av i og for seg ubetydelige mengder av additiver fås en vesentlig bedring av den i utførelseseksempel 1 anførte basis-blandings gasstendens, blir å tilskrive en synergistisk effekt av de anførte stoffer som benyttes som additiver. As can be deduced from the design examples and the associated drawing, it is possible with the additions in accordance with the invention to control the gas tendency of the gas mixture so that gas absorption is ensured up to a mineral oil content of over 90% by weight. This surprising fact, namely that with the help of the addition of in and of itself negligible amounts of additives prescribed according to the invention, a significant improvement in the gas tendency of the base mixture listed in embodiment 1 is obtained, is to be attributed to a synergistic effect of the listed substances which are used as additives.
Spenningsfastheten, som ved synkende mineraloljeinnhold avtar til halvparten, blir likeledes gunstig påvirket av de høyere mineraloljeandeler som oppfinnelsen gjør mulig. The tensile strength, which decreases to half with decreasing mineral oil content, is likewise favorably affected by the higher mineral oil proportions that the invention makes possible.
Utførelseseksempel 5:Execution example 5:
Pr. 100 g basisblanding ifølge utførelseseksempel 1Per 100 g of base mixture according to design example 1
ble der tilsatt 0,5 g 1,3,5-tri-metyl-2,4,6-tris-3,5-di-tert-butyl-4-hydroksy-benzyl-benzol (fenolisk antioksidasjons-midd) og benztriazol som metalldesaktivator. 0.5 g of 1,3,5-tri-methyl-2,4,6-tris-3,5-di-tert-butyl-4-hydroxy-benzyl-benzene (phenolic antioxidant mite) and benztriazole were added there as a metal deactivator.
Utførelseseksempel 6:Execution example 6:
Pr. 100 g basisblanding ifølge utførelseseksempel 1Per 100 g of base mixture according to design example 1
ble der tilsatt 0,1 g metyl-benzyl-triazol som metalldesaktivator . 0.1 g of methyl-benzyl-triazole was added there as a metal deactivator.
Utførelseseksempel 7:Execution example 7:
Pr. 100 g basisblanding ifølge utførelseseksempel 1Per 100 g of base mixture according to design example 1
ble der tilsatt 0,4 g 1-metyl-naftalin og 0,5 g 2-metyl-naftalin. 0.4 g of 1-methyl-naphthalene and 0.5 g of 2-methyl-naphthalene were added there.
Claims (10)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3425530 | 1984-07-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO852534L true NO852534L (en) | 1986-01-13 |
Family
ID=6240369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO852534A NO852534L (en) | 1984-07-11 | 1985-06-24 | ELECTRICAL APPLIANCES INSULATION OIL. |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0170054B1 (en) |
| JP (1) | JPS6134805A (en) |
| AT (1) | ATE49824T1 (en) |
| DE (1) | DE3575630D1 (en) |
| DK (1) | DK315285A (en) |
| FI (1) | FI852739A7 (en) |
| GR (1) | GR850003B (en) |
| NO (1) | NO852534L (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3617062A1 (en) * | 1986-05-21 | 1987-11-26 | Bayer Ag | IMPREGNATING AGENTS AND THEIR USE |
| NO984234L (en) * | 1998-09-14 | 2000-03-15 | Alsthom Cge Alcatel | Impregnation material for electric cables |
| FR2794567A1 (en) * | 1999-06-07 | 2000-12-08 | Atofina | DIELECTRIC COMPOSITION HAVING IMPROVED GAS ABSORPTION |
| US6315920B1 (en) | 1999-09-10 | 2001-11-13 | Exxon Research And Engineering Company | Electrical insulating oil with reduced gassing tendency |
| FR2983341B1 (en) * | 2011-11-30 | 2019-05-17 | Schneider Electric Industries Sas | POLYFLUORINATED OXIRANES AS GAS OF ELECTRICAL ISOLATION AND / OR EXTINGUISHING ELECTRIC ARCS AT MEDIUM VOLTAGE |
| FR2983340B1 (en) * | 2011-11-30 | 2019-05-17 | Alstom Technology Ltd | POLYFLUORINATED OXIRANES AS GAS OF ELECTRICAL ISOLATION AND / OR EXTINGUISHING ELECTRIC ARCS IN HIGH VOLTAGE |
| FR2986102A1 (en) * | 2012-01-23 | 2013-07-26 | Schneider Electric Ind Sas | Use of a gaseous medium comprising polyfluorinated oxirane and hydrofluoroolefin, as an electrical insulating gas and/or electric arc extinction in a medium voltage electrical appliance, which is e.g. a gas insulated electrical transformer |
| FR2986103B1 (en) * | 2012-01-23 | 2015-03-06 | Alstom Technology Ltd | GASEOUS MEDIUM COMPRISING AT LEAST ONE POLYFLUORINE OXIRAN AND A HYDROFLUOROOLEFINE FOR THE ELECTRICAL INSULATION AND / OR THE EXTINGUISHING OF HIGH VOLTAGE ELECTRIC ARCS |
| CN110073457A (en) * | 2017-01-03 | 2019-07-30 | Abb瑞士股份有限公司 | Insulation system and capacitor |
| JP7086136B2 (en) | 2020-06-03 | 2022-06-17 | Ｎｉｓｓｈａ株式会社 | Decorative molded products and their manufacturing methods |
| CN116554951B (en) * | 2023-05-19 | 2024-09-10 | 中国南方电网有限责任公司超高压输电公司大理局 | Capacitor insulating oil and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB625958A (en) * | 1946-03-23 | 1949-07-06 | British Thomson Houston Co Ltd | Improvements in and relating to insulating and dielectric compositions |
| DE2838831C2 (en) * | 1978-09-06 | 1983-02-17 | Siemens AG, 1000 Berlin und 8000 München | Electric capacitor |
| US4312794A (en) * | 1980-04-02 | 1982-01-26 | Electric Power Research Institute, Inc. | Ultra pure tetrachloroethylene dielectric fluid |
| DE3115545A1 (en) * | 1981-04-16 | 1982-11-18 | Bayer Ag, 5090 Leverkusen | IMPREGNANT AND ITS USE |
-
1985
- 1985-01-02 GR GR850003A patent/GR850003B/el unknown
- 1985-06-24 NO NO852534A patent/NO852534L/en unknown
- 1985-06-26 EP EP85107922A patent/EP0170054B1/en not_active Expired - Lifetime
- 1985-06-26 AT AT85107922T patent/ATE49824T1/en not_active IP Right Cessation
- 1985-06-26 DE DE8585107922T patent/DE3575630D1/en not_active Expired - Lifetime
- 1985-07-08 JP JP14987785A patent/JPS6134805A/en active Pending
- 1985-07-10 FI FI852739A patent/FI852739A7/en not_active Application Discontinuation
- 1985-07-10 DK DK315285A patent/DK315285A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0170054A1 (en) | 1986-02-05 |
| DK315285A (en) | 1986-01-12 |
| FI852739L (en) | 1986-01-12 |
| JPS6134805A (en) | 1986-02-19 |
| DK315285D0 (en) | 1985-07-10 |
| FI852739A7 (en) | 1986-01-12 |
| FI852739A0 (en) | 1985-07-10 |
| GR850003B (en) | 1985-05-06 |
| ATE49824T1 (en) | 1990-02-15 |
| DE3575630D1 (en) | 1990-03-01 |
| EP0170054B1 (en) | 1990-01-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| NO852534L (en) | ELECTRICAL APPLIANCES INSULATION OIL. | |
| Fofana et al. | Challenge of mixed insulating liquids for use in high-voltage transformers. 1. Investigation of mixed liquids | |
| NO143772B (en) | CAPACITOR. | |
| US4019996A (en) | Dielectric compositions | |
| Dung et al. | The effect of antioxidants on the physical and chemical properties of rice oil, corn oil, peanut oil and Kraft paper | |
| US2566208A (en) | Dielectric composition of halogenated aromatic hydrocarbon and organic antimony compound as a corrosion inhibitor | |
| US4566994A (en) | Flame-retardant electrical insulating oil composition | |
| NO861588L (en) | DIELECTRIC FLUIDUM. | |
| US4108789A (en) | Dielectric compositions containing benzyl esters | |
| US2572808A (en) | Dielectric with n, n'-1-3 dimorpholino isopropanol as scavenger | |
| US2840627A (en) | Liquid dielectrics and apparatus embodying the same | |
| KR960015424B1 (en) | Perchloroethylene dielectric fluid containing aliphatic hydrocarbons | |
| US2627504A (en) | Dielectric containing halogenated aromatic hydrocarbon and mono ortho tolyl biguanide as corrosion inhibitor | |
| GB1602092A (en) | Fluid insulated electrical apparatus | |
| KR20120050990A (en) | Electrical equipment containing erucic acid dielectric oil | |
| CA1081937A (en) | Electrical devices containing readily biodegradable dielectric fluids | |
| US3163705A (en) | Oil insulated impregnant for high voltage electrical apparatus | |
| US1999004A (en) | Dielectric composition | |
| US2646403A (en) | Halogenated aromatic hydrocarbon dielectric containing diphenyl tin diethylate as a scavenger | |
| US2617770A (en) | Compositions of matter comprising halogenated organic compounds | |
| GB2120273A (en) | Flameproof insulating fluids for impregnated electric cable | |
| US2573894A (en) | Compositions of matter comprising halogenated organic compounds | |
| GB2062671A (en) | Electric device comprising electrical insulating material | |
| US2566195A (en) | Dielectric composition of halogenated aromatic compound and aluminum isopropylate asa corrosion inhibitor | |
| US2566196A (en) | Chlorinated aromatic dielectric with scavenger |