EP0006392B1 - Insulating casing of moulded resin for electric apparatus - Google Patents

Insulating casing of moulded resin for electric apparatus Download PDF

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Publication number
EP0006392B1
EP0006392B1 EP79420026A EP79420026A EP0006392B1 EP 0006392 B1 EP0006392 B1 EP 0006392B1 EP 79420026 A EP79420026 A EP 79420026A EP 79420026 A EP79420026 A EP 79420026A EP 0006392 B1 EP0006392 B1 EP 0006392B1
Authority
EP
European Patent Office
Prior art keywords
insulating casing
insulating
fact
net
envelope
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
Application number
EP79420026A
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German (de)
French (fr)
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EP0006392A1 (en
Inventor
Maxime Danchin
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.)
Merlin Gerin SA
Original Assignee
Merlin Gerin SA
Priority date (The priority date 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 date listed.)
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Publication date
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Application filed by Merlin Gerin SA filed Critical Merlin Gerin SA
Publication of EP0006392A1 publication Critical patent/EP0006392A1/en
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Publication of EP0006392B1 publication Critical patent/EP0006392B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details

Definitions

  • the invention relates to an insulating casing of cast resin for electrical equipment, delimiting a sealed internal space for housing the active elements of said equipment and filled with a gas under pressure.
  • the object of the invention is to remedy these drawbacks and to allow the production of an insulating casing of cast resin which does not present any risk of splintering during bursting.
  • the envelope according to the invention is characterized in that a protective pocket, in the form of a net embedded in the wall of the envelope, surrounds said space and is made of an insulating material of characteristics allowing a deformation of said pocket without rupture during an accidental bursting of the envelope, so as to retain the fragments without preventing the escape of the compressed gas.
  • the elastic or stretchable net resists explosion and retains the fragments of the envelope while letting the gas escape towards the outside. Any risk of accident is thus avoided.
  • the elasticity or the deformation of the net can result from the geometric structure of the net or of the constituent material which can be a thermoplastic material such as polyethylene. polyvinyl chloride, polyamide.
  • the insulating mesh embedded in the envelope does not affect the dielectric and sealing qualities of the envelope if care is taken to avoid any bridge, consisting of a mesh extending between the inner wall and the outer wall of the envelope. The net contributes to the mechanical resistance of the envelope.
  • the net may or may not be woven and have larger or smaller meshes, for example a fraction of a millimeter or several millimeters.
  • the net is placed in the mold before casting, so as to be completely coated during casting with the resin, which penetrates into the meshes without altering the mechanical or physical characteristics of the net.
  • the resin may, depending on the applications, be an epoxy, polyester, polyurethane, polymethacrylate or the like resin.
  • FIG. 4 is a partial view on an enlarged scale of the net according to FIG. 1.
  • FIG. 1 The figures represent an envelope of a pole of a self-blowing circuit breaker described in French patent No. 2,346,841 of the applicant, and the invention is described below as being applied to such a circuit breaker, but it is indeed understood that it is applicable to any other type of shut-off device, transformer or sealed envelope capacitor containing an insulating gas under pressure.
  • a sealed space 10 of a pole of an electric circuit breaker is confined by a casing 12 made of two elements, in this case a tubular piece 14 molded in one piece of synthetic material, and a cover 16 for closing the bottom. open from part 14, said cover 16 being factory sealed.
  • the internal space 10 is filled with an electronegative insulating gas with high dielectric strength, in particular sulfur hexafluoride under pressure, and contains the mechanism and the active elements for extinguishing the arc (not shown).
  • Metal inserts 18, 20 are embedded in the wall of the casing 12 and constitute crossing conductors forming the inlet and the outlet of the pole housed in the space 10.
  • the material of the casing 12 is a cast resin ( epoxy, polyester, polyurethane, poly-methacrylate, etc.) and an orifice 22 for the passage of a rotary control shaft (not shown) is provided in the upper part of the casing 12.
  • a protective pocket 24 is incorporated into the wall of the envelope 12 and completely surrounds the space 10.
  • the pocket 24 is woven using a thread of insulating thermoplastic material, stretchable at temperature ambient, to form a retention net during an accidental bursting of the envelope 12.
  • the retention effect is obtained by the elongation of the thermoplastic thread composing the net, and the diameter of the texture thread is chosen between 0, 1 and 2 mm depending on the configuration of the enclosure and the internal gas pressure.
  • the net is housed in the mold before the casting of the resin and is provided with holes for the passage of the bearing of the shaft and the inserts 18, 20.
  • the net 24 can be woven or non-woven, the thermoplastic material being for example polyethylene, polyvinyl chloride, polyamide or linear polyester.
  • the width of the meshes can be a few tenths of a millimeter or a few millimeters.
  • the protective pocket ensures the retention of the fragments of the exploded envelope without opposing the escape of the gas.

Landscapes

  • Gas-Insulated Switchgears (AREA)
  • Insulators (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Fuses (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Housings And Mounting Of Transformers (AREA)

Description

L'invention est relative à une enveloppe isolante en résine coulée pour appareillage électrique, délimitant un espace interne étanche de logement des éléments actifs dudit appareillage et rempli d'un gaz sous pression.The invention relates to an insulating casing of cast resin for electrical equipment, delimiting a sealed internal space for housing the active elements of said equipment and filled with a gas under pressure.

Les enveloppes connues du genre mentionné sont disposées derrière des grillages ou parois de protection destinés à retenir les fragments de l'enveloppe lors d'un éclatement accidentel. Ces grillages n'assurent qu'une protection partielle et ils sont encombrants.Known envelopes of the kind mentioned are arranged behind gratings or protective walls intended to retain the fragments of the envelope during an accidental bursting. These screens provide only partial protection and they are bulky.

L'invention a pour but de remédier à ces inconvénients et de permettre la réalisation d'une enveloppe isolante en résine coulée ne présentant aucun risque de dispersion d'éclats lors d'un éclatement.The object of the invention is to remedy these drawbacks and to allow the production of an insulating casing of cast resin which does not present any risk of splintering during bursting.

L'enveloppe selon l'invention est caractérisée par le fait qu'une poche de protection, en forme de filet noyé dans la paroi de l'enveloppe, entoure ledit espace et est réalisée en un matériau isolant de caractéristiques permettant une déformation de ladite poche sans rupture lors d'un éclatement accidentel de l'enveloppe, de manière à retenir les éclats sans empêcher l'échappement du gaz comprimé.The envelope according to the invention is characterized in that a protective pocket, in the form of a net embedded in the wall of the envelope, surrounds said space and is made of an insulating material of characteristics allowing a deformation of said pocket without rupture during an accidental bursting of the envelope, so as to retain the fragments without preventing the escape of the compressed gas.

Le filet élastique ou étirable résiste à l'explosion et il retient les fragments de l'enveloppe tout en laissant échapper le gas vers l'extérieur. Tout risque d'accident est ainsi évité. L'élasticité ou la déformation du filet peut résulter de la structure géométrique du filet ou du matériau constitutif qui peut être un matériau thermoplastique tel que le polyéthylène. le polychlorure de vinyle, le polyamide.The elastic or stretchable net resists explosion and retains the fragments of the envelope while letting the gas escape towards the outside. Any risk of accident is thus avoided. The elasticity or the deformation of the net can result from the geometric structure of the net or of the constituent material which can be a thermoplastic material such as polyethylene. polyvinyl chloride, polyamide.

Le filet isolant noyé dans l'enveloppe n'affecte pas les qualités diélectriques et d'étanchéité de l'enveloppe si l'on prend soin d'éviter tout pont, constitué par une maille s'étendant entre la paroi interne et la paroi externe de l'enveloppe. Le filet contribue à la résistance mécanique de l'enveloppe.The insulating mesh embedded in the envelope does not affect the dielectric and sealing qualities of the envelope if care is taken to avoid any bridge, consisting of a mesh extending between the inner wall and the outer wall of the envelope. The net contributes to the mechanical resistance of the envelope.

Le filet peut être tissé ou non et présenter des mailles plus ou moins grandes, par exemple d'une fraction de millimètres ou de plusieurs millimètres. Le filet est mis en place dans le moule avant la coulée, de manière à être entièrement enrobé lors de la coulée par la résine, qui pénètre dans les mailles sans altérer les caractéristiques mécaniques ou physiques du filet. La résine peut selon les applications être une résine époxyde, polyester, polyuréthane, poly- méthacrylate ou analogue.The net may or may not be woven and have larger or smaller meshes, for example a fraction of a millimeter or several millimeters. The net is placed in the mold before casting, so as to be completely coated during casting with the resin, which penetrates into the meshes without altering the mechanical or physical characteristics of the net. The resin may, depending on the applications, be an epoxy, polyester, polyurethane, polymethacrylate or the like resin.

D'autres avantages et caractéristiques ressortiront plus clairement de l'exposé qui va suivre d'un mode de mise en oeuvre de l'invention, donné à titre d'exemple non limitatif et représenté au dessin annexé, dans lequel:

  • la figure 1 est une coupe axiale selon la ligne 1-1 de la fig. 2 d'une enveloppe isolante de disjoncteur selon l'invention;
  • la figure 2 est une vue de profil de la fig. 1;
  • la figure 3 est une coupe suivant la ligne III-III de la fig. 1;
Other advantages and characteristics will emerge more clearly from the description which follows of an embodiment of the invention, given by way of nonlimiting example and represented in the appended drawing, in which:
  • Figure 1 is an axial section along line 1-1 of FIG. 2 of a circuit breaker insulating jacket according to the invention;
  • FIG. 2 is a side view of FIG. 1;
  • Figure 3 is a section along line III-III of FIG. 1;

la figure 4 est une vue partielle à échelle agrandie du filet selon la fig. 1.FIG. 4 is a partial view on an enlarged scale of the net according to FIG. 1.

Les figures représentent une enveloppe d'un pôle d'un disjoncteur à autosoufflage décrit dans le brevet français N° 2.346.841 de la demanderesse, et l'invention est décrite par la suite comme étant appliquée à un tel disjoncteur, mais il est bien entendu qu'elle est applicable à tout autre type d'appareil de coupure, de transformateur ou de condensateur à enveloppe étanche contenant un gaz isolant sous pression. Sur les figures, un espace 10 étanche d'un pôle d'un disjoncteur électrique est confiné par une enveloppe 12 en deux éléments, en l'occurrence une pièce 14 tubulaire moulée monobloc en matière synthétique, et un couvercle 16 d'obturation du fond ouvert de la pièce 14, ledit couvercle 16 étant scellé en usine. L'espace interne 10 est rempli d'un gaz isolant électronégatif à haute rigidité diélectrique, notamment de l'hexafluorure de soufre sous pression, et renferme le mécanisme et les éléments actifs d'extinction de l'arc (non représentés). Des inserts métalliques 18, 20 sont noyés dans la paroi de l'enveloppe 12 et constituent des conducteurs de traversée formant l'entrée et la sortie du pôle logé dans l'espace 10. Le matériau de l'enveloppe 12 est une résine coulée (époxyde, polyester, polyuréthane, poly- méthacrylate, etc...) et un orifice 22 de passage d'un arbre de commande rotatif (non représenté) est ménagé dans la partie supérieure de l'enveloppe 12.The figures represent an envelope of a pole of a self-blowing circuit breaker described in French patent No. 2,346,841 of the applicant, and the invention is described below as being applied to such a circuit breaker, but it is indeed understood that it is applicable to any other type of shut-off device, transformer or sealed envelope capacitor containing an insulating gas under pressure. In the figures, a sealed space 10 of a pole of an electric circuit breaker is confined by a casing 12 made of two elements, in this case a tubular piece 14 molded in one piece of synthetic material, and a cover 16 for closing the bottom. open from part 14, said cover 16 being factory sealed. The internal space 10 is filled with an electronegative insulating gas with high dielectric strength, in particular sulfur hexafluoride under pressure, and contains the mechanism and the active elements for extinguishing the arc (not shown). Metal inserts 18, 20 are embedded in the wall of the casing 12 and constitute crossing conductors forming the inlet and the outlet of the pole housed in the space 10. The material of the casing 12 is a cast resin ( epoxy, polyester, polyurethane, poly-methacrylate, etc.) and an orifice 22 for the passage of a rotary control shaft (not shown) is provided in the upper part of the casing 12.

Selon l'invention, une poche de protection 24 est incorporée dans la paroi de l'enveloppe 12 et entoure complètement l'espace 10. La poche 24 est tissée à l'aide d'un fil en matière thermoplastique isolante, étirable à la température ambiante, pour former un filet de rétention lors d'un éclatement accidentel de l'enveloppe 12. L'effet de rétention est obtenu par l'allongement du fil thermoplastique composant le filet, et le diamètre du fil de texture est choisi entre 0,1 et 2 mm selon la configuration de l'enveloppe et la pression interne du gaz. Le filet est logé dans le moule avant la coulée de la résine et est muni de trous pour le passage du palier de l'arbre et des inserts 18, 20. Le filet 24 peut être tissé ou non tissé, la matière thermoplastique étant par exemple du polyéthylène, du polychlorure de vinyle, un polyamide ou un polyester linéaire. La largeur des mailles peut être de quelques dizièmes de millimètres ou de quelques millimètres.According to the invention, a protective pocket 24 is incorporated into the wall of the envelope 12 and completely surrounds the space 10. The pocket 24 is woven using a thread of insulating thermoplastic material, stretchable at temperature ambient, to form a retention net during an accidental bursting of the envelope 12. The retention effect is obtained by the elongation of the thermoplastic thread composing the net, and the diameter of the texture thread is chosen between 0, 1 and 2 mm depending on the configuration of the enclosure and the internal gas pressure. The net is housed in the mold before the casting of the resin and is provided with holes for the passage of the bearing of the shaft and the inserts 18, 20. The net 24 can be woven or non-woven, the thermoplastic material being for example polyethylene, polyvinyl chloride, polyamide or linear polyester. The width of the meshes can be a few tenths of a millimeter or a few millimeters.

Lors d'un éclatement accidentel de l'enveloppe 12, la poche de protection assure la rétention des fragments de l'enveloppe éclatée sans s'opposer à l'échappement du gaz.During an accidental bursting of the envelope 12, the protective pocket ensures the retention of the fragments of the exploded envelope without opposing the escape of the gas.

Il est clair qu'un filet de protection additionnel peut être incorporé dans le couvercle 16 d'obturation de l'enveloppe 12, et que ces filets ne peuvent suppléer aux protections conventionnelles des appareils en service, notamment aux cellules seules capables de retenir les éclats lors d'une violente explosion due à une surpression interne excessive.It is clear that an additional protective net can be incorporated in the cover 16 for closing the envelope 12, and that these nets cannot replace the conventional protections of the apparatuses in service, in particular with the only cells able to retain the fragments during a violent explosion due to an excessive internal overpressure.

Claims (4)

1. Insulating casing (12) of molded resin for an electrical apparatus confining an inner gas- tight space (10) housing the active elements of said apparatus and filled with compressed gas, characterized by the fact that a protective net shaped sack (24) embedded in the wall of the casing (12) surrounds said space (10) and is made of an insulating material having characteristics so as to allow a deformation of said sack without breaking in case of an accidental explosion of the casing so as to retain the fragments without hindering the compressed gas to escape.
2. Insulating casing according to claim 1, characterized by the fact that the protective sack (24) is of a ductile thermoplastic material.
3. Insulating casing according to claim 2, characterized by the fact that said thermoplastic material is selected from the group consisting of polyolefins, polyvinyls, polyamids or linear polyesters.
4. Insulating casing according to any one of the claims 1-3, characterized by the fact that said net is an elastic woven or non woven fabric.
EP79420026A 1978-06-12 1979-05-31 Insulating casing of moulded resin for electric apparatus Expired EP0006392B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7818032A FR2428905A1 (en) 1978-06-12 1978-06-12 INSULATING ENCLOSURE WITH INCORPORATED PROTECTION NET FOR ELECTRICAL EQUIPMENT WITH GAS INSULATION
FR7818032 1978-06-12

Publications (2)

Publication Number Publication Date
EP0006392A1 EP0006392A1 (en) 1980-01-09
EP0006392B1 true EP0006392B1 (en) 1981-11-04

Family

ID=9209605

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79420026A Expired EP0006392B1 (en) 1978-06-12 1979-05-31 Insulating casing of moulded resin for electric apparatus

Country Status (7)

Country Link
US (1) US4271343A (en)
EP (1) EP0006392B1 (en)
JP (2) JPS5517296A (en)
DE (1) DE2961220D1 (en)
DK (1) DK154375C (en)
FR (1) FR2428905A1 (en)
YU (1) YU40734B (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4401841A (en) * 1981-01-23 1983-08-30 Meyer Jeffry R Explosion resistant insulator and method of making same
US4499039A (en) * 1981-12-29 1985-02-12 Berg Arthur H Method for making plastic article with fibrous reinforcement
US4772230A (en) * 1981-12-29 1988-09-20 Cooper Industries, Inc. Plastic plugs and receptacles reinforced with cured resin coated glass cloth
US4419651A (en) * 1982-06-24 1983-12-06 General Electric Company High voltage current limiting fuse having a fuse element susceptible to oxidation and especially suited for high operating temperatures
JP2506724Y2 (en) * 1991-06-04 1996-08-14 日新電機株式会社 Gas equipment container
US5410446A (en) * 1993-09-10 1995-04-25 Cooper Industries, Inc. Circuit breaker explosion stress absorber
EP1947669A1 (en) * 2007-01-17 2008-07-23 Abb Research Ltd. Pole for a gas insulated high voltage switch and method for producing such a switch pole
FR2975814B1 (en) * 2011-05-27 2014-02-21 Maclean Power France METHOD FOR MANUFACTURING HOLLOW BODIES FOR COMPOSITE ELECTRIC INSULATORS AND HOLLOW BODIES OBTAINED WITH SUCH A METHOD

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE668232C (en) * 1930-08-30 1938-11-29 Frida Strauss Geb Ruppel Insulating body for pressurized gas switch
US2801768A (en) * 1954-12-20 1957-08-06 Westinghouse Electric Corp Explosion-proof enclosure
CH357781A (en) * 1958-05-30 1961-10-31 Bbc Brown Boveri & Cie Isolator for switching chambers
DE1440184A1 (en) * 1961-08-03 1969-02-20 Sachsenwerk Licht & Kraft Ag Process for the production of a pole piece for electrical circuit breakers
NL289301A (en) * 1962-02-22 1965-03-25
DE2058148C3 (en) * 1970-11-26 1975-02-13 Felten & Guilleaume Kabelwerke Ag, 5000 Koeln Pressure-resistant electrical insulating hose, especially for small terminations of electrical cables
CH538186A (en) * 1972-09-21 1973-06-15 Sprecher & Schuh Ag Process for the production of a molded, electrically insulating, hardenable plastic housing for high-voltage circuit breakers and a housing produced by the process
US3979709A (en) * 1975-05-22 1976-09-07 The Chase-Shawmut Company Electric fuse having a multiply casing of a synthetic - resin glass-cloth laminate
GB1584955A (en) * 1976-07-28 1981-02-18 Explosafe Sa Explosionsuppressive filler masses
GB1564550A (en) * 1976-12-14 1980-04-10 Jowitt P Fire protection means for fuel tanks

Also Published As

Publication number Publication date
FR2428905A1 (en) 1980-01-11
DE2961220D1 (en) 1982-01-14
JPS6036973Y2 (en) 1985-11-02
YU26979A (en) 1982-06-30
EP0006392A1 (en) 1980-01-09
JPS6048307U (en) 1985-04-05
DK239879A (en) 1979-12-13
YU40734B (en) 1986-04-30
JPS5517296A (en) 1980-02-06
FR2428905B1 (en) 1980-10-24
DK154375B (en) 1988-11-07
US4271343A (en) 1981-06-02
DK154375C (en) 1989-04-10

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