EP0700058B1 - Verfahren zum Schutz von porösen Bauelementen vor hohen Potentialdifferenzen und danach hergestellte Bauelemente - Google Patents

Verfahren zum Schutz von porösen Bauelementen vor hohen Potentialdifferenzen und danach hergestellte Bauelemente Download PDF

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Publication number
EP0700058B1
EP0700058B1 EP19950401954 EP95401954A EP0700058B1 EP 0700058 B1 EP0700058 B1 EP 0700058B1 EP 19950401954 EP19950401954 EP 19950401954 EP 95401954 A EP95401954 A EP 95401954A EP 0700058 B1 EP0700058 B1 EP 0700058B1
Authority
EP
European Patent Office
Prior art keywords
resin
components
porous
dielectric
bath
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19950401954
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English (en)
French (fr)
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EP0700058A1 (de
Inventor
Jean-Pierre Delvinquier
Christian Girardet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
Thomson CSF SA
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Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0700058A1 publication Critical patent/EP0700058A1/de
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Publication of EP0700058B1 publication Critical patent/EP0700058B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
    • H01C1/028—Housing; Enclosing; Embedding; Filling the housing or enclosure the resistive element being embedded in insulation with outer enclosing sheath

Definitions

  • the present invention relates to a method for protecting porous components subject to high potential differences and to components thus produced.
  • the overall electrical insulation of the electronic device is conventionally provided by a dielectric fluid, for example an oil mineral; this fluid is likely to penetrate into the porosities of the material. If the component is subjected to a high potential difference applied in a very short time, the dielectric fluid present in the cavities porous material can be partially destroyed and release particles conductive carbonaceous. Local degradation can then spread and lead to the short-circuiting of the component, which leads immediately its total destruction. Another possibility of degradation exists if the dielectric fluid is capable of releasing gas bubbles under the effect of the electric field (phenomenon known as "degazing"). In this case, the gas bubble which is created in a microcavity is capable of generating significant stress on the walls of the cavity and crack the material, which also leads to the destruction of the component.
  • a dielectric fluid for example an oil mineral
  • the present invention relates to a protection method durable against electrical breakdown with minimum Joule losses, of porous components bathed in an insulating fluid, the products of protection to be compatible with the insulating fluid at temperatures up to about 150 ° C, which allows, when these components are subject to high potential differences, and / or to discharges repeated high voltage electrics, to avoid their destruction, process which is easy to use and provides long-term protection.
  • the present invention also relates to components having a porous part, which are protected against destruction when subject to high potential differences, and the price of which cost is not exaggeratedly increased by such protection.
  • the process according to the invention for the protection of porous components subject to high potential differences, intended to be bathed in a dielectric fluid, these components being first degassed, then impregnated in a hot bath of polymerizable resin which is polymerized after penetration into the porosities of these components, is characterized in that the impregnation is carried out under pressure with a fluid resin compatible with the dielectric fluid, said polymerized resin having rigidity dielectric at operating temperature of minus 5 kV / mm.
  • porous components protected according to the invention which are intended to be subject to high potential differences and are bathed in a dielectric fluid, are characterized in that their porosities are completely filled with non-attackable polymerized resin by the dielectric fluid and having a dielectric strength at temperature at least 5 kV / mm.
  • FIG. 1 the simplified diagram of an example of high voltage circuit comprising a porous component.
  • the circuit of the figure 1 comprises: a generator 1 comprising a high voltage output 2 producing, relative to the mass, a high voltage HT, of 40 KV per example.
  • the generator 1 also has two outputs 3, 4 (the output 4 being connected to ground) between which appears a low voltage LV feeding the filament of an electronic tube 5 (for example a tube output amplifier of a radio transmitter) whose cathode is connected to the ground and the anode at the outlet 2 through a resistor 6 immersed in organic or mineral oil.
  • This resistance 6 is of low value (for example a few tens of ohms) and not inductive.
  • the material commonly used to achieve resistance 6 is a weakly conductive ceramic made from elements finely ground minerals, mixed and cooked at high temperature to form a slightly porous solid with excellent resistance electrical and thermal constraints.
  • the protection conventionally used against penetration of dielectric fluids into porous components consists of a protective coating deposited on the surface.
  • This coating can be a paint, a varnish or a resin coating.
  • the coating material must constitute a waterproof film without no discontinuity and able to tolerate the extended stay without degradation in the dielectric fluid under the operating conditions of the material (pressure, temperature, vibrations, ..;) and mechanical attacks possible (scratches).
  • This coating must adhere perfectly to the different supports: porous material constituting the body of the component, electrical connections, fixings .
  • the coating must have a high resistivity of surface so as not to be the seat of notable leakage currents.
  • a resistance 7 thus treated.
  • This resistor 7 comprises a body 8 in porous ceramic and two connection electrodes 9, 10 with their wires connection 11, 12.
  • the above processing results in the formation of a outer protective layer 13 on resistor 7, excluding, well heard, wires 11, 12 which are spared. If, for example at point 14 from layer 13 a crack, scratch or puncture occurs layer, the insulating oil in which this resistance is immersed ends up pass through this layer and penetrates into the porosities of the resistance, which can destroy it as described above.
  • Another solution is to use a dielectric fluid high performance with greater dielectric strength and does not release no gas due to electric shocks.
  • This solution excludes many common fluids, therefore inexpensive, and requires the use of synthetic compounds (silicone oil, perfluorinated fluids %) many more expensive, and generally denser than mineral oils traditional, which precludes their use in equipment airborne.
  • the proposed method consists of a total impregnation of the porous material using a very fluid resin which is subsequently polymerized to obtain a solid dielectric.
  • This solid dielectric therefore occupies all the cavities and porosities of the material and penetration of the dielectric fluid is made impossible.
  • the component mentioned above is resistance but we can obviously treat other components comprising a substrate or a porous part, such as for example capacitors, coils.
  • the support can be ceramic or ferrite for example.
  • the resistance in tension of these resistances, immersed in a bath mineral or organic oil is excellent and is maintained after number of uses (capacitive discharges) greater than 1000, at voltage maximum applicable, while these same non-impregnated resistances and used under the same conditions are destroyed very quickly (approximately 10 discharges).
  • the process of the invention allows, compared to the processes known, at equal voltage, to significantly increase their lifespan, or, for the same lifetime, to increase the voltage applied to these components, and / or using an ordinary oil bath instead of an oil high quality, very expensive.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Organic Insulating Materials (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Insulating Of Coils (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)

Claims (5)

  1. Verfahren zum Schutz von porösen Komponenten, die hohen Potentialdifferenzen unterworfen und dazu bestimmt sind, in einem dielektrischen Fluid zu baden, wobei diese Komponenten zunächst entgast und dann in einem heißen Bad aus polymerisierbarem Harz, das nach dem Eindringen in die Porenräume dieser Komponenten polymerisiert wird, imprägniert werden, dadurch gekennzeichnet, daß die Imprägnierung unter Druck mit einem Fluidharz erfolgt, das mit dem dielektrischen Fluid kompatibel ist, wobei das polymerisierte Harz bei der Verwendungstemperatur eine dielektrische Festigkeit von wenigstens 5 kV/mm besitzt.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Harz vor der Ausführung der Imprägnierung unter Vakuum bis auf eine Temperatur vorerhitzt wird, bei der es die Viskosität annimmt, die erforderlich ist, um in die Porenräume der Komponente einzudringen.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Viskosität bei Wärme des Harzes kleiner oder gleich ungefähr 0,5 Pa•s ist.
  4. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß nach der Imprägnierung in dem heißen Harzbad dieses Bad mit einem Druck von ungefähr 20 Bar beaufschlagt wird.
  5. Komponenten, die einen porösen Teil aufweisen und dazu bestimmt sind, hohen Potentialdifferenzen unterworfen zu werden, und in einem dielektrischen Fluid baden, dadurch gekennzeichnet, daß ihre Porenräume vollständig mit polymerisiertem Harz gefüllt sind, das mit dem dielektrischen Fluid nicht reagiert und bei der Verwendungstemperatur eine dielektrische Festigkeit von wenigstens 5 kV/nm besitzt.
EP19950401954 1994-08-30 1995-08-25 Verfahren zum Schutz von porösen Bauelementen vor hohen Potentialdifferenzen und danach hergestellte Bauelemente Expired - Lifetime EP0700058B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9410410 1994-08-30
FR9410410A FR2724044B1 (fr) 1994-08-30 1994-08-30 Procede de protection de composants poreux soumis a des differences de potentiel elevees et composants ainsi realises

Publications (2)

Publication Number Publication Date
EP0700058A1 EP0700058A1 (de) 1996-03-06
EP0700058B1 true EP0700058B1 (de) 2000-02-09

Family

ID=9466557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950401954 Expired - Lifetime EP0700058B1 (de) 1994-08-30 1995-08-25 Verfahren zum Schutz von porösen Bauelementen vor hohen Potentialdifferenzen und danach hergestellte Bauelemente

Country Status (4)

Country Link
EP (1) EP0700058B1 (de)
DE (1) DE69514969T2 (de)
FR (1) FR2724044B1 (de)
WO (1) WO2004075215A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2767675B1 (fr) 1997-08-26 1999-12-03 Materiel Orthopedique En Abreg Implant intersomatique et ancillaire de preparation adapte pour permettre sa pose

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5663888A (en) * 1979-10-26 1981-05-30 Hokkaido Nozai Kogyo Co Manufacture of polymerrimpregnated burnt body
JPS60120780A (ja) * 1983-12-02 1985-06-28 Mitsubishi Rayon Co Ltd 多孔性物品の含浸、封孔方法
JPS61188481A (ja) * 1985-02-14 1986-08-22 Dia Furotsuku Kk 耐熱性の優れた樹脂含浸剤組成物
JPS63182391A (ja) * 1987-01-23 1988-07-27 Daiichi Kasei Kogyo Kk 多孔性剛性物体用含浸剤
JPS63252981A (ja) * 1987-04-08 1988-10-20 住友ベークライト株式会社 セラミツクス−高分子複合成形品及びその製造方法

Also Published As

Publication number Publication date
FR2724044B1 (fr) 1997-01-03
WO2004075215A1 (fr) 2004-09-02
DE69514969D1 (de) 2000-03-16
EP0700058A1 (de) 1996-03-06
FR2724044A1 (fr) 1996-03-01
DE69514969T2 (de) 2000-08-17

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