EP0439411B1 - Verbundisolator und dessen Herstellungsverfahren - Google Patents

Verbundisolator und dessen Herstellungsverfahren Download PDF

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Publication number
EP0439411B1
EP0439411B1 EP91420001A EP91420001A EP0439411B1 EP 0439411 B1 EP0439411 B1 EP 0439411B1 EP 91420001 A EP91420001 A EP 91420001A EP 91420001 A EP91420001 A EP 91420001A EP 0439411 B1 EP0439411 B1 EP 0439411B1
Authority
EP
European Patent Office
Prior art keywords
rod
sleeve
core
covering
sleeves
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
EP91420001A
Other languages
English (en)
French (fr)
Other versions
EP0439411A1 (de
Inventor
Roger Bastard
Pierre Novel
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.)
Nouvelle des Ets Dervaux Sa Ste
Dervaux SA
Original Assignee
Nouvelle des Ets Dervaux Sa Ste
Dervaux 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.)
Filing date
Publication date
Application filed by Nouvelle des Ets Dervaux Sa Ste, Dervaux SA filed Critical Nouvelle des Ets Dervaux Sa Ste
Priority to AT91420001T priority Critical patent/ATE103099T1/de
Publication of EP0439411A1 publication Critical patent/EP0439411A1/de
Application granted granted Critical
Publication of EP0439411B1 publication Critical patent/EP0439411B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/32—Single insulators consisting of two or more dissimilar insulating bodies
    • H01B17/325—Single insulators consisting of two or more dissimilar insulating bodies comprising a fibre-reinforced insulating core member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/02—Suspension insulators; Strain insulators

Definitions

  • the invention relates to composite insulators constituted, on the one hand, by a core formed by a longitudinal rod in composite material at the ends of which are shrunk the sleeves of fixing pieces of malleable metal, and on the other hand, by an insulating skirt in insulating synthetic material, fitted with fins and molded onto the core.
  • the rod is composed of fibers, glass or other, arranged longitudinally and bonded to each other by pultrusion, that is to say by passage between heating jaws ensuring the crosslinking of the thermosetting resin coating the fibers.
  • the rod has an irregular diameter, in shape and dimension, so that after cutting in length, it is subjected to a longitudinal machining intended to give it a circular cross section of constant and precise diameter allowing it to be fitted. in the sleeves.
  • This machining affects not only the bonding resin but also the fibers and creates microcracks which can be sources of rupture over time.
  • connection of the rod with the sleeves of the ends is currently carried out by various methods.
  • each sleeve on the rod by means of jaws in several parts delimiting between them a groove of polygonal or circular section.
  • each of the elements of the jaw is subjected to a radial force generating on the sleeve a radial tightening stress which is not uniform circumferentially, whatever the structure of the jaws, which promotes the ovalization of the rod. and sometimes delamination of its constituent fibers, leading to the reject of the core of this insulator.
  • Another method consists in ensuring the shrinking of the sleeve by means of radial blades, regularly distributed around the sleeve, pivotally mounted around axes perpendicular to the longitudinal axis of this sleeve, and whose progressive contact of the working faces on the sleeve provides continuous compression tolerating the longitudinal creep of the metal in front of them.
  • the tightening stress is not really uniform and possibilities for delamination subsist.
  • the value of the residual tightening stress may vary in the direction of reducing its value, and or even allow separation of the rod and the sleeve, for example under the action of a torque.
  • Document DE-A-1 921 299 describes a composite insulator composed of a core on which is molded a skirt made of insulating material and provided with fins, the core itself being composed of an axial rod made of composite material on the ends of which are mounted end sleeves of fixing end pieces, the rod being composed of a core of longitudinal fibers and linked by a thermosetting resin, the part of the rod outside the sleeves as well as the parts of the sleeves which surround the rod being covered with a peripheral envelope, composed of continuous fibers, clamped on these parts and linked to them by a thermosetting resin, each of the sleeves of the fixing end pieces being linked to the corresponding end of the rod, on the one hand, by radial tightening of the sleeve on it, and on the other hand, by complementarity of the internal profile of the sleeve with the corrugated profile of the end of the rod.
  • the manufacturing process described in DE-A-1 921 299 consists in producing the composite rod from a core of longitudinal and parallel fibers, impregnated with resin and in subjecting this core, at its ends which will be embedded in the sleeves, at a shaping pressure to obtain a corrugated profile which cooperates by complementarity with the internal profile of the sleeve, to cover the part of the rod outside the sleeves as well as the parts of the sleeves which surround the rod, with an envelope device composed of continuous fibers, bonded to them by a resin, thermosetting and overmolding a skirt of insulating material on the peripheral envelope.
  • This solution provides the rod-sleeve connection by the resin which is interposed between the complementary corrugated profiles and improves the anchoring on the rod of the skirt made of insulating material by means of the envelope surrounding this rod and the sleeves.
  • the object of the present invention is to provide a composite insulator overcoming the drawbacks of the techniques described above and in which the connection between the nozzle and the rod is regular and stable and has excellent resistance, both in torsion and longitudinally.
  • this insulator is composed of a core on which is molded a skirt of insulating material and provided with fins, the core itself being composed of an axial rod of composite material on the ends of which are shrunk sleeves. extremities of malleable metal fixing ends, the rod being composed over its entire length of a core of longitudinal fibers, parallel and linked by a thermosetting resin and of a peripheral envelope composed of continuous fibers, clamped on this core and linked to it by the thermosetting resin, each of the sleeves of the fixing ends being linked to the corresponding end of the rod, on the one hand, by uniformly distributed radial tightening of the sleeve on it, and, on the other hand, by penetration of the metal of the sleeve in the gaps between the fibers of the envelope.
  • the envelope is constituted by a braid or a covering.
  • the die When the die is moved over the sleeve, it exerts on it a compression by spinning forcing the metal constituting this sleeve to creep in front of the die. Thanks to the envelope, enveloping and protecting the core of the rod, this creep causes only a low elongation stress on the fibers of the core, fibers which, thus, are not likely to be delaminated by this elongation.
  • the average stress in the rod is less than that obtained.
  • each insulator is composed of a core, generally designated by A, itself constituted by a rod 2, the ends of which are integral with fixing ends 7 and 8, and a skirt made of synthetic material 3 overmolded on the core and comprising peripheral fins spaced 4.
  • the rod 2 is composed of a core of fibers 5, made of glass or synthetic material, pre-impregnated with a thermosetting resin, arranged parallel to each other to form a continuous bundle which is enclosed in a tubular braid 6, made of fibers glass and made on the soul.
  • a tubular braid made of fibers glass and made on the soul.
  • the tightening communicated to the constituent fibers of this braid causes the exudation of the resin permeating the longitudinal fibers.
  • the resin also permeates the fibers of the braid and thus ensures, after crosslinking, the connection of this braid in the tight state with the fibers 5.
  • the excess resin is wiped off by an annular seal before passage rod in an enclosure ensuring its crosslinking.
  • the braid is replaced by a covering wrapped with tightening around the fibers 5.
  • the rod 2 has a constant diameter, which avoids having to machine it by turning.
  • each of the fixing ends comprises a sleeve 9 integral with a fixing part constituted, for the end piece 7, by a yoke 10 and for the end piece 8, by a pierced stud 12
  • Each tip is obtained by precision molding and is made of a malleable metal such as steel or an aluminum alloy.
  • the sleeve of each end piece 7 and 8 comprises, coming from molding, a groove 13 disposed opposite its free end.
  • the bottom 11 of this groove has the dimensions and the profile of the internal bore 14 of the die 15 in two parts which will be used later to constrict this sleeve on the end of the rod.
  • each of its ends is engaged in the internal bore of the corresponding sleeve 9, which sleeve itself n 'needs to undergo no machining.
  • the connection of each sleeve with the corresponding end of the rod is ensured by compression and spinning by means of the die 15 which is arranged in the corresponding groove 13 and moved longitudinally on the sleeve going towards its free end. Under the action of this displacement, the metal constituting the sleeve flows in front of the die, causing the elongation of this sleeve.
  • the clamping stress provided by the die has sufficient value to obtain this creep without exerting a stress on the rod causing the end of the rod to retract, while allowing the metal constituting the sleeve to be inserted in the interval between meshes of the braid 6 to form notches represented schematically at 17 in FIG. 2. These notches thus ensure a positive mechanical connection between the rod and the corresponding sleeve.
  • This connection has a resistance to elongation similar to that obtained by traditional methods and a torsional resistance at least 30% higher than that obtained by these methods.
  • the core ring is free of microcracks and delaminated fibers.
  • the core A When the core A is thus produced, it is placed, without any machining, in a mold where it receives by overmolding the skirt 3 which is made of a synthetic material 3 having good electrical insulation characteristics such as a thermoplastic elastomer or thermosetting.
  • the sleeve 20 of the end piece 21 is integral with the body 22 of an attachment clip on one of the conductors of one of the phases.
  • this sleeve comprises, coming from molding, a groove 23, shown in phantom in Figure 4, allowing its fixing by compression and stretching by means of a die on the end of a rod 2a.
  • the sleeves are constricted on the rod after it has received its molded skirt.
  • the sleeve has a stepped bore whose portion of larger diameter is capable of covering the corresponding end of the skirt, and the operation of compression compression and spinning also affects this portion of larger diameter so that it is tightened radially on the end of the skirt. This arrangement improves the tightness of the rod-sleeve connection.
  • the fastening members of the ends 7b and 8b are shaped into respectively female and male elements of a connection of the type commonly known as ball-socket.
  • the skirt 3b completely covers the sleeves 9b so that its ends coincide with the more massive zones 30 and 32 of the ends 7b and 8b
  • this particular arrangement of the skirt transfers onto these thicker and more resistant parts 30 and 32, the attachment zones of a possible power arc connecting the two ends of the insulator and allows the insulator to withstand short circuit currents with higher currents.
  • FIG. 5 also shows that, by means of the fixing of each sleeve to the rod by means of a compression and spinning operation by die, that is to say by means requiring a small footprint, the zones of connection of the sleeves with the rod may be in the immediate vicinity of the attachment zone of the endpiece.

Landscapes

  • Insulators (AREA)
  • Insulating Bodies (AREA)

Claims (6)

  1. Verbundisolator, umfassend einen Kern (A), an welchem ein mit Rippen (4) versehener Mantel (3) aus Isoliermaterial angeformt ist, wobei der Kern (A) einen axialen Stab (2) aus Verbundmaterial umfaßt, auf dessen Enden Endhülsen (9; 20; 9b) von Befestigungsansätzen (7, 8) aus streckbarem Metall unter Querschnittsverminderung angebracht sind, wobei ferner der Stab (2) auf seiner ganzen Länge eine Seele aus longitudinalen, paralellen, durch ein warmaushärtendes Harz verbundenen Fasern (5) und eine von kontinuierlichen, auf diese Seele gedrängten, mit ihr durch das warmaushärtende Harz verbundenen Fasern gebildete Umfangshülle (6) umfaßt, wobei jede der Hülsen (9; 20; 9b) der Befestigungsansätze (7, 8) mit dem entsprechenden Ende des Stabs (2), einerseits durch gleichmäßig verteiltes radiales Drucken der Hülse auf dieses und andererseits durch Eindringen des Metalls der Hülse in die Zwischenräume zwischen den Fasern der Hülle (6) verbunden ist.
  2. Isolator nach Anspruch 1, dadurch gekennzeichnet, daß die Hülle (6) von einem Geflecht gebildet ist.
  3. Isolator nach Anspruch 1, dadurch gekennzeichnet, daß die Hülle (6) von einer Umspinnung gebildet ist.
  4. Isolator nach einem der Ansprüche 2 und 3, dadurch gekennzeichnet, daß die Hülse (9; 20; 9b) jedes Ansatzes (7,8) vor ihrer Befestigung auf dem Stab (2), vom Formen herrührend, umfaßt, einen in Längsrichtung entgegengesetzt von ihrem freien Ende angeordneten, äußeren, zylindrischen Bereich (11), dessen Außendurchmesser und dessen Profil denjenigen des Innenprofils (14) des das Ziehen der Hülse (9; 20; 9b) auf den Stab (2) gewährleistenden Ziehelements (15) ähnlich sind.
  5. Isolator nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß jeder Ansatz (21; 7b, 8b) zwischen der Hülse (20; 9b) zur Verbindung mit dem Stab (2a; 2) und seinen Mitteln zum Befestigen und Halten an einem Träger einen massiven Abschnitt (25; 30; 32) mit einem stärkeren Querschnitt umfaßt, während der sich auch über jede Hülsen (20; 9b) erstreckende, angeformte Mantel (3) auf jeder Hülse (20; 9b) in Höhe der massiven Abschnitte (25; 30, 32) endet.
  6. Verfahren zum Herstellen eines Verbundisolators des Typs nach Anspruch 4, umfassend:
    Erzeugen eines Verbundstabs (2; 2a) aus einer Seele von longitudinalen und parallelen, mit warmaushärtendem Harz imprägnierten Fasern (5),
    Enges Umschließen der Seele (5) auf ihrer ganzen Länge mit einer Umfangshülle (6) aus kontinuierlichen, mit der Seele durch das warmaushärtende Harz verbundenen Fasern,
    Schneiden des Stabs auf die erforderliche Länge unter Ausbildung einer Abfasung,
    Einfügen jedes der Enden des Stabs (2; 2a) im Herstellungsrohzustand in eine Hülse (9; 20; 9b) eines Befestigungsansatzes 12) aus streckbarem Metall, welche gleichfalls im Herstellungsrohzustand ist,
    Durchführen eines Kompressions- und Ziehvorgangs der Hülse (9; 20; 9b) auf das Ende des Stabs (2; 2a) mittels eines kreisförmigen Ziehelements (15), welches, in zwei Teilen auf einen zylindrischen Bereich (11) der Hülse (9; 20; 9b) aufgesetzt, longitudinal in Richtung auf das Ende dieser Hülse verlagert wird, um die Hülse auf dem Stab (2; 2a) unter Querschnittsvermfnderung anzubringen, mit einem konstanten Schrumpfungsbetrag, der ausreicht, daß das die Hülse bildende Metall gleichzeitig radial mit einer gleichmäßigen Verteilung und in die Zwischenräume der Umfangshülle (6) des Stabs (2; 2a) fließt, ohne die Scherbruchgrenze dieses Stabs (2; 2a) zu erreichen, und longitudinal fließt, zugleich mit dem Verlagern des Ziehelements (15) auf der Hülse (9; 20; 9b),
    und Anformen eines Rippen (4) aufweisenden Mantels (3; 3a; 3b) aus Isoliermaterial an wenigstens der Hülle (6) des Stabs (2; 2a).
EP91420001A 1990-01-26 1991-01-03 Verbundisolator und dessen Herstellungsverfahren Expired - Lifetime EP0439411B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT91420001T ATE103099T1 (de) 1990-01-26 1991-01-03 Verbundisolator und dessen herstellungsverfahren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9001373 1990-01-26
FR9001373A FR2657721B1 (fr) 1990-01-26 1990-01-26 Isolateur composite et son procede de fabrication.

Publications (2)

Publication Number Publication Date
EP0439411A1 EP0439411A1 (de) 1991-07-31
EP0439411B1 true EP0439411B1 (de) 1994-03-16

Family

ID=9393437

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91420001A Expired - Lifetime EP0439411B1 (de) 1990-01-26 1991-01-03 Verbundisolator und dessen Herstellungsverfahren

Country Status (5)

Country Link
US (1) US5220134A (de)
EP (1) EP0439411B1 (de)
AT (1) ATE103099T1 (de)
DE (1) DE69101388D1 (de)
FR (1) FR2657721B1 (de)

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US5406033A (en) * 1992-09-02 1995-04-11 Maclean-Fogg Company Insulator structure and method of construction
US5374780A (en) * 1992-09-02 1994-12-20 Maclean Fogg Company Composite insulator structure and method of construction
US5448019A (en) * 1993-08-06 1995-09-05 Hubbell Incorporated Weight optimized end fitting
US5475186A (en) * 1993-08-06 1995-12-12 Hubbell Incorporated End fitting with optimized stress distribution
JP2723468B2 (ja) * 1994-03-28 1998-03-09 日本碍子株式会社 ポリマー碍子
JP2905416B2 (ja) * 1995-03-20 1999-06-14 日本碍子株式会社 複合碍子の端部分成形方法およびそれに用いる端部分成形治具
US6065207A (en) * 1995-03-20 2000-05-23 Ngk Insulators, Ltd. Composite insulators and a process for producing the same
TW406461B (en) * 1996-03-01 2000-09-21 Cooper Ind Inc Enhanced polymer ic weathershed and surge arrester and method of making same
US5945636A (en) * 1996-04-22 1999-08-31 Hubbell Incorporated Electrical insulators with mechanical core and dielectric sheath
JPH10228826A (ja) * 1997-02-13 1998-08-25 Ngk Insulators Ltd ポリマー碍子
JPH10269878A (ja) * 1997-03-25 1998-10-09 Ngk Insulators Ltd ポリマー碍子の把持方法及びそれに用いるダイス
US5877453A (en) * 1997-09-17 1999-03-02 Maclean-Fogg Company Composite insulator
US5986216A (en) * 1997-12-05 1999-11-16 Hubbell Incorporated Reinforced insulator
FI105002B (fi) * 1999-03-19 2000-05-15 Ensto Sekko Oy Päätykiinnikkeillä varustettu vetotanko ja menetelmä sen valmistamiseksi
FR2812754B1 (fr) * 2000-08-01 2002-09-20 Sediver Procede de fabrication d'un isolateur electrique a tige
CA2349253C (en) * 2000-12-26 2009-11-17 S&C Electric Company Method and arrangement for providing a gas-tight housing joint
US20050155786A1 (en) * 2001-02-02 2005-07-21 Krol Robert A. Apparatus bushing with silicone-rubber housing
US20030080848A1 (en) * 2001-10-29 2003-05-01 Hubbell Incorporated Unitary arrester housing and support bracket
US6952154B2 (en) 2002-06-16 2005-10-04 Maclean-Fogg Company Composite insulator for fuse cutout
US6831232B2 (en) * 2002-06-16 2004-12-14 Scott Henricks Composite insulator
AU2004258449A1 (en) * 2003-07-21 2005-01-27 Edi International, Inc. Insulator integrated with clamp
US7683751B2 (en) * 2007-01-18 2010-03-23 Eaton Corporation Fuse mounting member
US7646282B2 (en) * 2007-12-14 2010-01-12 Jiri Pazdirek Insulator for cutout switch and fuse assembly
US8729396B2 (en) 2010-09-02 2014-05-20 Cooper Technologies Company Full composite insulator for electrical cutout
EP2445071B1 (de) * 2010-10-15 2014-01-01 ABB Technology AG Halter für Hochspannungsausleitungen in Öltransformatoren
US9524815B2 (en) * 2013-11-05 2016-12-20 Abb Schweiz Ag Surge arrester with moulded sheds and apparatus for moulding
GB2543676B (en) 2014-08-15 2019-04-10 Halliburton Energy Services Inc Enhanced radial support for wireline and slickline
CN110246730B (zh) * 2019-07-19 2024-10-18 常州博瑞电力自动化设备有限公司 一种直流断路器用复合绝缘拉杆
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JPS5787016A (en) * 1980-11-20 1982-05-31 Ngk Insulators Ltd Synthetic resin insulator
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FR2511179A1 (fr) * 1981-08-05 1983-02-11 Ceraver Isolateur de hauban de type composite
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Also Published As

Publication number Publication date
EP0439411A1 (de) 1991-07-31
ATE103099T1 (de) 1994-04-15
FR2657721A1 (fr) 1991-08-02
DE69101388D1 (de) 1994-04-21
FR2657721B1 (fr) 1992-05-15
US5220134A (en) 1993-06-15

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