EP3579253B1 - Système de chaîne pour une ligne aérienne haute ou très haute tension - Google Patents

Système de chaîne pour une ligne aérienne haute ou très haute tension Download PDF

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Publication number
EP3579253B1
EP3579253B1 EP18175766.7A EP18175766A EP3579253B1 EP 3579253 B1 EP3579253 B1 EP 3579253B1 EP 18175766 A EP18175766 A EP 18175766A EP 3579253 B1 EP3579253 B1 EP 3579253B1
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EP
European Patent Office
Prior art keywords
protective
end fitting
fitting
chain assembly
ring
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.)
Active
Application number
EP18175766.7A
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German (de)
English (en)
Other versions
EP3579253C0 (fr
EP3579253A1 (fr
Inventor
Thomas Lustenberger
Erwin Kurzo
Thomas Carlin
Jonas Trüssel
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.)
BKW Energie AG
Pfisterer Switzerland AG
Original Assignee
BKW Energie AG
Pfisterer Switzerland AG
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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Priority to EP18175766.7A priority Critical patent/EP3579253B1/fr
Publication of EP3579253A1 publication Critical patent/EP3579253A1/fr
Application granted granted Critical
Publication of EP3579253B1 publication Critical patent/EP3579253B1/fr
Publication of EP3579253C0 publication Critical patent/EP3579253C0/fr
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    • 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
    • H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
    • H01B17/46—Means for providing an external arc-discharge path
    • 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
    • H01B17/06—Fastening of insulator to support, to conductor, or to adjoining insulator
    • 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

Definitions

  • the invention relates to a chain arrangement for a high or extra-high voltage overhead line, comprising a long-rod insulator with an insulating core made of fiber-reinforced plastic and at least one end fitting and an arrangement for dissipating surge voltages with at least one protective fitting.
  • the at least one protective fitting is attached to the at least one end fitting of the long-rod insulator.
  • long-rod insulators are used in particular to support the conductors of overhead lines. On the one hand, they create a mechanical connection between the respective overhead line mast and the respective conductor cable. On the other hand, they insulate the conductor cable electrically from the overhead line pylon.
  • Long-rod insulators usually have a circular-cylindrical insulating core that is mechanically connected to end fittings at both ends. As a rule, the insulating core is surrounded by a sheathing that has a shielded outer shape, resulting in a long creepage path along the outside of the insulator.
  • the umbrellas are also usually designed in such a way that the underside of the umbrellas remains as dry as possible when it rains.
  • the long-rod insulators have a certain specified length, which results from the desired electrical properties, e.g. B. in relation to the possibility of rollover results.
  • the distance between the lower edge of the grounded mast-side part at the top and the live rope-side part at the bottom is relevant here.
  • Long rod insulators are each part of a chain arrangement.
  • this includes in particular mast-side fastening elements, a carrier device for the conductor cable and, if necessary, a connecting element for a weight unit.
  • the elements of the chain assembly are connected to each other by suitable connecting elements, such as those conforming to international standards such as IEC 60471/19L.
  • Chain arrangements for high-voltage lines typically with voltages in the 50-150 kV range
  • extra-high-voltage lines typically with voltages in the 220-400 kV range
  • protective fittings form, for example, a defined spark gap for dissipating overvoltages, such as those that occur in particular when lightning strikes. This largely prevents the dissipation from taking place via the insulator.
  • an arc between the mast and the cable should be kept away from the insulating core and its possible sheathing and extinguished by an appropriate geometry and materialization of the protective fitting.
  • Protective fittings often comprise two similarly or identically designed parts, which are fitted above the actual insulator (i.e. on the pylon side) and below the actual insulator (i.e. on the rope side). Fastening by means of separate elements that are fastened above and below the long-rod insulator is typical. These separate elements have some axial extent and thus add to the overall length of the chain assembly.
  • long-rod insulators were made of ceramic materials.
  • Long-rod insulators with a core made of fiber-reinforced plastic e.g. B. glass fiber reinforced plastic (GFI ⁇ )
  • GFI ⁇ glass fiber reinforced plastic
  • the insulating core of such insulators is not cemented into the corresponding end fitting, but is typically clamped or pressed. Due to the greater axial extent of the press or clamp connection compared to the adhesive connection, this usually means that the overall length of a long-rod insulator with a core made of fiber-reinforced plastic is greater than the overall length of an I ⁇ eramil ⁇ long-rod insulator with corresponding electrical properties .
  • a greater length is also disadvantageous because it is associated with a greater pivoting range, and thus with a reduction in the minimum distance between the conductor cable and the mast shaft.
  • I ⁇ ette arrangements are known in which there are no separate elements above and below the long-rod insulator for attaching the protective fittings.
  • EP 0 038 475 A2 Arl Pfisterer Elektrotechnische Spezialartil GmbH & Co. KG ) an end fitting for an insulator with a core made of glass fiber reinforced plastic (GFI ⁇ ).
  • GFI ⁇ glass fiber reinforced plastic
  • the housing of the end fitting, the bracing element serves as a support for a shielding ring, which is formed by a thickened edge of a funnel.
  • the shielding ring is integrally connected to the housing in the direction of the opposite end fitting.
  • the DE 30 14 600 A1 (I ⁇ arl Pfisterer Elektrotechnische Spezialartil ⁇ el GmbH & Co. KG ) relates to a connection fitting for an insulator rod made of glass fiber reinforced plastic with a clamping device matched to the outer diameter of the rod. At a certain length, the fitting should enable a significantly higher holding force than previously known fittings.
  • An additional clamping device is used for this purpose, which is designed for a smaller outside diameter of the bar than the usual clamping device.
  • the clamping elements are preferably made up of at least two clamping cones, which have a weakened zone, e.g. B. an annular groove are connected to each other.
  • the end section of the insulator rod is reduced to the inner diameter of the corresponding clamping cone.
  • a guard ring is formed by the reinforced rim of a bell, the bell being clamped onto the cup-like portion of the end fitting via a hollow cylindrical hub portion slotted longitudinally.
  • the GB834,085 describes an insulator for high voltage lines with which a line can be fixed to a pole and which has arcing horns.
  • the object of the invention is therefore to create a chain arrangement belonging to the technical field mentioned at the outset, which has a reduced susceptibility to faults in the event of overvoltages, while fulfilling the electrical requirements and having a minimum length.
  • the at least one protective fitting is fastened in an end-side axial area of the at least one end fitting, outside of a connection area between the insulating core and the end fitting.
  • connection area between the insulating core and the end fitting means that there is a first axial area (dissipation area), which is defined by the conductive connection between the protective fitting and the end fitting, and a second axial area (core area), which is defined by the expansion of the insulating core into the end fitting is determined, do not intersect axially.
  • first axial area dissipation area
  • core area second axial area
  • the fiber-reinforced plastic is, in particular, glass fiber-reinforced plastic (GFI ⁇ ). But there are also insulation from other fiber-reinforced plastics such.
  • GFI ⁇ glass fiber-reinforced plastic
  • B. carbon fiber reinforced plastic (CFI ⁇ ) can be used.
  • the long-rod insulator comprises two end fittings, one being arranged at each end of the insulating core.
  • the chain arrangement also includes two protective fittings, one being attached to each end fitting.
  • the protective fitting is in particular made of galvanized steel, but designs made of other metallic materials or another material with sufficient conductivity and mechanical stability are also possible.
  • the protective fitting can also be composed of parts made of different materials.
  • the chain assembly may further include a jacket surrounding the insulating core as described above.
  • the protective fitting comprises a fastening element which can be attached to the end fitting.
  • This allows attachment to commercially available long rod insulators.
  • the geometry of the fastening element is specifically adapted to the external geometry of the corresponding end fittings, and/or it can be adapted to the external geometry of the end fittings within a certain range.
  • This has the advantage that available long-rod insulators can easily be equipped with protective fittings.
  • the protective fittings attached by means of the fastening element can be easily replaced, e.g. B. after an arcing event.
  • the fastening element can be formed in one piece with the actual protective fitting, but it can also be present as a separate element which is connected to the actual protective fitting in a suitable manner, e.g. B. welded and / or screwed.
  • the fastening element can be designed in one or more parts.
  • the fastening element preferably comprises a receptacle in which a region of the end fitting can be accommodated with a suitable fit. This enables a mechanically stable fastening of the protective fitting with a large electrical contact area between the fastening element and the end fitting.
  • the receptacle is preferably designed in such a way that the received area lies completely outside the connection area between the insulating core and the end fitting.
  • the receptacle can include an area that tapers at the end, which interacts with a taper of the end fitting.
  • a stop is also possible, which interacts with the front free end of the end fitting.
  • the receptacle is formed by two half-shells.
  • the half-shells allow a large-scale attachment with simultaneous Adaptability to slightly different geometries, e.g. B. due to thermal effects or manufacturing tolerances. For this purpose, in particular the mutual distance between the two half-shells is changed slightly.
  • Such a design also guarantees the coaxial alignment between the protective fitting and the insulating core, regardless of the position of the insulating core, particularly when it is deflected.
  • a symmetrical arrangement of two half-shells, which largely surround the end fitting (preferably at least 70% of the circumference) ensures that currents that arise when dissipating overvoltages and short circuits are diverted axially downwards as far as possible from the half-shells via the outer areas of the housing of the end fitting become. Radial currents through the interior of the end fitting, which could damage the insulating core, are minimized.
  • the at least one end fitting has a first through-opening
  • the fastening element comprises a second through-opening, so that a bolt-like element is guided through the first and second through-openings to connect the fastening element to the end fitting.
  • bolts, screws, threaded rods, etc. come into consideration as bolt-like elements.
  • the bolt-like element preferably has a head, which is supported on a first side on the fastening element and/or the end fitting, and a counterpart, which is supported on a second side on the fastening element and/or the end fitting.
  • the bolt also serves to connect the end fitting to the following element (e.g. a holding device for the conductor cable) together.
  • the bolt has the task of creating a reliable electrical connection between the protective fitting and the subsequent element. High currents can thus be discharged largely independently of the end fitting.
  • the combination of a fastening element with two half-shells and the connection with the bolt-like element is particularly preferred.
  • the head of the bolt-like element is located outside a first of the half-shells. The element passes through this first half-shell, then the end fitting and finally the second half-shell in the corresponding through-openings. On the outside of the second half-shell, the bolt-like element then has a counterpart, which secures the element together with the head against slipping out.
  • the protective fitting is in particular a protective ring.
  • Such protective rings ensure that no corona discharges occur in the interior of the ring, which could damage the long-rod insulator. Analogously to a Faraday cage, they shield the interior space defined by the protective ring or protective rings. This avoids peak discharges on elements of the long-rod insulator.
  • the protective ring does not necessarily have to be a closed ring.
  • the ring can be interrupted and have two free ends, in particular for the defined discharge of overvoltages between two correspondingly designed protective rings.
  • the protective ring When the protective ring is fastened by means of a fastening element with two half-shells, the protective ring preferably comprises a ring element which is connected to each of the half-shells via an arm in each case. This results in a mechanically stable attachment and a defined and even discharge of overvoltages from the ring element via the arms and the fastening element into the end fitting and the subsequent element.
  • the invention can also be implemented with other protective fittings, e.g. B. with protective horns or protective bells.
  • the protective fittings can each be attached one or more times at both ends or only on one side - depending on the protective function and needs.
  • a press connection is formed between the insulating core and the end fitting in the connection area.
  • Such connections have proven to be well suited for insulating tubes made of fiber-reinforced plastic.
  • the invention can also be implemented with long-rod insulators in which the insulating core is connected to the end fitting in a different way, e.g. B. via an adhesive connection or a screw connection.
  • the chain arrangement comprises two protective fittings of the same design, each of which is fastened to one of two end fittings.
  • the use of protective fittings of the same design results in reduced storage costs because different components do not have to be kept on hand for both sides.
  • FIGS. 1A, 1B show two side views of an installed chain arrangement 100 according to the invention.
  • the arrangement shown is designed for an operating voltage of 145 kV.
  • the chain arrangement 100 includes a long-rod insulator 110 with a glass fiber insulating core.
  • the insulator is below, in connection with the figure 3 described in more detail.
  • the chain arrangement 100 further comprises two protective rings 150 which are attached to the upper and lower ends of the long-rod insulator 110 in a mirror-inverted manner. They will be discussed below, in connection with the figure 2 described in more detail.
  • the chain assembly 100 is suspended from an overhead power line pylon (not shown) by a steel hanger 10 known per se.
  • a double strap 20 made of steel is attached at the lower end of the chain arrangement 100, namely at the lower end fitting 130 of the long-rod insulator 110.
  • a suspension clamp 30 made of aluminum and steel is added, which carries the conductor cable 1 of the overhead line.
  • a protective spiral 35 made of aluminum is arranged between the suspension clamp 30 and the conductor cable 1 in a manner known per se.
  • a fork link 40 made of steel is attached, which carries a weight unit 50 .
  • the minimum breaking load of the entire chain arrangement is 120 kN.
  • the fork connection dimensions correspond to the standard IEC 60471/19L.
  • the steel parts are each hot-dip galvanized.
  • the length a of the chain arrangement (measured from the upper connection axis to the hanging device to the lower connection axis to the double strap) is 1504 mm.
  • the length b between the suspension device and the cable suspension point is 1700 mm.
  • the Figures 2A, 2B show two side views of the protection ring of the chain assembly
  • the Figure 2C shows a plan view of the guard ring.
  • the guard ring 150 is made of steel. It comprises the actual ring 152, the fastening element 160 and two arms 154, 156 connecting the ring 152 and the fastening element 160, which are welded at their ends to the ring 152 and to the fastening element 160, respectively.
  • the ring 152 is not closed in itself, but ends in two end horns 152a, 152b, which are bent at an angle of 10° to the ring main part and which each have a spherical end part at their end.
  • the two guard rings 150 of the chain assembly 100 are arranged such that the spherical end portions face away from each other.
  • a defined path for discharging overvoltages is formed, which extends from the terminating parts of the end horns 152a, 152b on one side of the long-rod insulator 110 to the terminating parts of the end horns 152a, 152b on the other side of the long-rod insulator 110.
  • the two protective rings 150 electrically shield the main part of the long-rod insulator 110 . The result is a lightning withstand voltage of 660 kV.
  • the fastening element 160 comprises two half-shells 162, 164. They each have a U-shaped cross section and are arranged in mirror images facing one another, so that they define a receiving space between them.
  • a bolt 170 made of steel runs through aligned through-openings in the two half-shells 162, 164.
  • the arms 154, 156 extend from the ring 152 initially perpendicular to the plane defined by the ring body. After a straight section, they follow a 90° arc and are welded to one of the half-shells 162, 164 at their end opposite the ring 152.
  • FIG. 12 shows a vertical cross-section through an end portion of the insulator and the guard ring attachment member, taken along line AA in Fig Figure 2C .
  • the long-rod insulator 110 includes an insulating core 120 made of high-strength glass fiber reinforced plastic, which is surrounded by the end fitting 130 at its end.
  • the insulating core 120 is in its central area, which extends over approx. 90% of the length of the insulator, surrounded by a shielded jacket 132 of silicone material.
  • the screens result in a creepage distance of 3,870 mm.
  • the rod which forms the ring 152 of the protective ring is located in the cross section shown to the side of the end fitting 130, approximately at the level of the outer end of the casing 132.
  • the fastening element 160 with the two half-shells 162, 164 encloses a fork-like end section of the end fitting 130. It does not extend into the connection area between the end fitting and the insulating core (cf. the dashed line). Both the fastening element 160 and a connecting part of the double link 20 are fastened to the end fitting 130 by means of a bolt 170 .
  • the bolt 170 has a bolt head 172 and, on the opposite side, a snap-on retaining ring 174 so that it is secured against slipping out of the end fitting 130 .
  • the bolt 170 not only serves to mechanically fasten the fastening element 160 to the end fitting 130, it also ensures the correct axial positioning and rotational position of the protective fitting 150 relative to the long-rod insulator 110. It also conducts a significant proportion of the leakage current from the fastening element 160 to the connecting part of the double strap 20.
  • the fastening element 160 with the two half-shells 162, 164 is pushed axially onto the end section of the end fitting 130 from the outside. Then the connecting part of the double strap 20 is pushed into the fork-like end section of the end fitting 130 . Finally, the bolt 170 is pushed in and secured.
  • the existing bolt When retrofitting an existing long-rod insulator, the existing bolt is removed and replaced by a longer model so that the two half-shells can also be accommodated between the bolt head and the opposite retaining ring.
  • spacers for attaching protective fittings between the long-rod insulator and the respective fastening part can be saved.
  • there is a length reduction of 120 mm for each intermediate piece saved which means 240 mm for protective fittings arranged on both sides.
  • Typical I ⁇ ette arrangements with long-rod insulators with a GRP core are approx. 220 mm longer than corresponding arrangements with I ⁇ eramil ⁇ insulators. This additional length can thus be compensated in the case of attachment on both sides according to the solution according to the invention. There is even a certain reduction in the overall length.
  • the invention is not limited to the illustrated embodiment.
  • other types of protective fittings can also be attached to the end fitting in the manner according to the invention. If necessary, only one protective fitting is present.
  • the geometry of the fastening part can differ from that of the exemplary embodiment.
  • the half-shells can be shaped differently, or instead of half-shells, a one-piece receptacle is used, which optionally includes flexible sections.
  • the fastening part can be fixed to the end fitting by another element instead of the bolt or in addition to the bolt, e.g. B. a clamping mechanism. In this case, the positioning can be ensured by other means, in particular stop means.
  • the long-rod insulator shown is only to be understood as an example. With a different geometry of the end fitting and/or a different expansion of the Isolating core in the end fitting also results in a different geometry of the fastening part.
  • the invention creates a chain arrangement which has a reduced susceptibility to faults in the event of overvoltages, while meeting the electrical requirements and having a minimum length.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulators (AREA)

Claims (7)

  1. Agencement de chaîne (100) pour une ligne aérienne à haute ou très haute tension, comprenant
    a) un isolateur à tige longue (110) avec un noyau isolant (120) en matière plastique renforcée par des fibres ainsi qu'au moins une armature d'extrémité (130),
    b) un agencement de dérivation de surtension avec au moins une armature de protection,
    c) l'au moins une armature de protection comprenant un élément de fixation (160) qui est fixé à l'au moins une armature d'extrémité (130) de l'isolateur à tige longue (110),
    d) la fixation de l'au moins une armature de protection s'effectuant dans une zone axiale côté extrémité de l'au moins une armature d'extrémité (130), en dehors d'une zone de liaison entre le noyau isolant (120) et l'armature d'extrémité (130),
    e) l'au moins une armature d'extrémité (130) présentant une première ouverture de passage et en ce que l'élément de fixation (160) comprend une deuxième ouverture de passage, de telle sorte que pour relier l'élément de fixation (160) à l'armature d'extrémité (130), un élément (170) en forme de boulon est guidé à travers la première et la deuxième ouverture de passage,
    caractérisé en ce que l'élément en forme de boulon (170) sert également à relier l'armature d'extrémité (130) à un élément suivant, notamment un dispositif de retenue pour un câble conducteur (1).
  2. Agencement de chaîne (100) selon la revendication 1, caractérisé en ce que l'élément de fixation (160) comprend un logement dans lequel une zone de l'armature d'extrémité (130) peut être reçue de manière ajustée.
  3. Agencement de chaîne (100) selon la revendication 2, caractérisé en ce que le logement est formé par deux demi-coques (162, 164).
  4. Agencement de chaîne (100) selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'armature de protection consiste en un anneau de protection (150).
  5. Agencement de chaîne (100) selon la revendication 3 et selon la revendication 4, caractérisé en ce que l'anneau de protection (150) comprend un élément annulaire (152), l'élément annulaire (152) étant relié à chacune des demi-coques (162, 164) par l'intermédiaire d'un bras (154, 156) respectif.
  6. Agencement de chaîne (100) selon l'une quelconque des revendications 1 à 5, caractérisé en ce que, dans la zone de liaison, une liaison par pression est réalisée entre le noyau isolant (120) et l'armature d'extrémité (130) .
  7. Agencement de chaîne (100) selon l'une quelconque des revendications 1 à 6, caractérisé en ce qu'il comprend deux armatures de protection réalisées de manière identique, fixées chacune à l'une des deux armatures d'extrémité (130).
EP18175766.7A 2018-06-04 2018-06-04 Système de chaîne pour une ligne aérienne haute ou très haute tension Active EP3579253B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18175766.7A EP3579253B1 (fr) 2018-06-04 2018-06-04 Système de chaîne pour une ligne aérienne haute ou très haute tension

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18175766.7A EP3579253B1 (fr) 2018-06-04 2018-06-04 Système de chaîne pour une ligne aérienne haute ou très haute tension

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EP3579253A1 EP3579253A1 (fr) 2019-12-11
EP3579253B1 true EP3579253B1 (fr) 2023-06-14
EP3579253C0 EP3579253C0 (fr) 2023-06-14

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Publication number Priority date Publication date Assignee Title
CN110133458B (zh) * 2019-05-24 2024-02-06 沈阳工业大学 一种应用于高压试验中的半自动放电的试验装置及方法

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Publication number Priority date Publication date Assignee Title
US2007141A (en) 1930-07-12 1935-07-02 Locke Insulator Corp Grading ring
GB834085A (en) * 1957-09-20 1960-05-04 British Insulated Callenders Improvements in or relating to strain insulators
US3898372A (en) 1974-02-11 1975-08-05 Ohio Brass Co Insulator with resin-bonded fiber rod and elastomeric weathersheds, and method of making same
RO122653B1 (ro) 2006-02-08 2009-10-30 Eximprod Grup S.A. Izolator compozit de susţinere

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DE2164615A1 (de) * 1971-12-24 1973-06-28 Bbc Brown Boveri & Cie Lichtbogen-schutzarmatur fuer isolatorenhaengeketten
DE3014600C2 (de) 1980-04-16 1982-04-08 Karl Pfisterer Elektrotechnische Spezialartikel Gmbh & Co Kg, 7000 Stuttgart Anschlußarmatur für einen Isolatorstab aus glasfaserverstärktem Kunststoff
DE3014601A1 (de) 1980-04-16 1981-10-22 Karl Pfisterer Elektrotechnische Spezialartikel Gmbh & Co Kg, 7000 Stuttgart Armatur zur herstellung einer mit hoher zugkraft belastbaren verbindung mit einem glasfaserverstaerkten kunststoffstab
JPH09171732A (ja) * 1995-12-20 1997-06-30 Tohoku Electric Power Co Inc 導体耐張碍子装置の鳥害防止用ア−クホ−ン
CN101763922B (zh) * 2009-12-09 2012-05-23 中国电力科学研究院 输电线路复合绝缘子的防雷保护方法和装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2007141A (en) 1930-07-12 1935-07-02 Locke Insulator Corp Grading ring
GB834085A (en) * 1957-09-20 1960-05-04 British Insulated Callenders Improvements in or relating to strain insulators
US3898372A (en) 1974-02-11 1975-08-05 Ohio Brass Co Insulator with resin-bonded fiber rod and elastomeric weathersheds, and method of making same
RO122653B1 (ro) 2006-02-08 2009-10-30 Eximprod Grup S.A. Izolator compozit de susţinere

Non-Patent Citations (1)

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Title
KLENGEL HORST: "Isolatoren und Armaturen für Isolatorketten in Starkstrom-Freileitungen", 1 January 2009, pages: 140 - 147, 182 - 185, 226, 227, XP093175185

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EP3579253C0 (fr) 2023-06-14
EP3579253A1 (fr) 2019-12-11

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