EP2117013B1 - A hang-type composite insulator - Google Patents

A hang-type composite insulator Download PDF

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Publication number
EP2117013B1
EP2117013B1 EP07845658.9A EP07845658A EP2117013B1 EP 2117013 B1 EP2117013 B1 EP 2117013B1 EP 07845658 A EP07845658 A EP 07845658A EP 2117013 B1 EP2117013 B1 EP 2117013B1
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EP
European Patent Office
Prior art keywords
mandrel
hang
sleeve
type composite
composite insulator
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.)
Not-in-force
Application number
EP07845658.9A
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German (de)
French (fr)
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EP2117013A1 (en
EP2117013A4 (en
Inventor
Xuewen Xie
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.)
Zhuzhou Times New Material Technology Co Ltd
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Zhuzhou Times New Material Technology Co Ltd
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Publication of EP2117013A1 publication Critical patent/EP2117013A1/en
Publication of EP2117013A4 publication Critical patent/EP2117013A4/en
Application granted granted Critical
Publication of EP2117013B1 publication Critical patent/EP2117013B1/en
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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
    • H01B17/02—Suspension insulators; Strain insulators
    • H01B17/06—Fastening of insulator to support, to conductor, or to adjoining insulator

Definitions

  • the invention relates to a composite insulator for use in electrical lines or electrified railways, in particular, to a hang-type composite insulator.
  • CN 1 239 803 A teaches a hang-type composite insulator, comprising a mandrel, an umbrella-skirt sheath disposed outside the mandrel and an end assembly disposed at one end of the mandrel, the mandrel has the form of a rod stock;
  • the end assembly comprises a sleeve with a tapered aperture, a flared conical body for inserting into any end of the mandrel, a locking nut and a connection member, wherein the flared conical body is generally cone-shaped, the sleeve is a tubular member, an inner aperture of the small diameter end of the sleeve corresponds to the diameter of the mandrel, an inner aperture of the large diameter end of the sleeve is configured into a horn shape.
  • EP 38 475 A discloses an insulator having a glass fiber reinforced plastic rod to which an end cap is attached. The end cap is pressed onto the rod after which and end peace is screwed on to it.
  • An insulator is typically made of insulator material with extremely high electrical resistance.
  • the insulator serves to space out conductors having different electrical potentials apart and allows no electrical current flowing therebetween so that the electric current will circulate in a certain direction.
  • hang-type insulators at home and abroad can be divided into ceramic insulators, glass insulators and composite insulators. Ceramic and glass insulators are fragile and susceptible to contamination, tending to cause accidents such as high voltage flashover and exploding bottle cracks. The mandrel of common rod-shaped composite insulators exhibit poor flexibility in resisting bending and are fragile as well.
  • insulators made of organic composite materials, i.e. composite insulators are widely used at home and abroad.
  • End attachments of an insulator are used to connect and fix the insulator to electricity transmission lines and telegraph poles. These end attachments not only sustain various external forces inside the system and pressure produced by transmission wires themselves, but also sustain wind forces from uncertain directions and pressure resulted from accumulated snow during a long term use. Therefore, the connecting quality between end attachments and the mandrel is a significant symbol which directly affects the safety and reliability of product operation.
  • a commonly used connecting technique is to connect a mandrel with end attachments by press-fit assembly process. However, such process tends to induce cracking, loosening and aging and leads to poor stability, thus becoming a potential safety hazard.
  • the object of the invention is to, addressing the above existing problems and shortcomings, provide a hang-type composite insulator which has good flexibility, contamination and cracking resistance.
  • such hang-type composite insulator can generate a connection which is safe and has high strength, good stability, durability and anti-aging capability.
  • This hang-type composite insulator comprises among others a mandrel (1), an umbrella-skirt sheath (2) disposed outside the mandrel (1) and end assemblies (3) disposed at both ends of the mandrel (1), the orientated glass fiber is used as reinforced body material for mandrel and is then formed into a rod stock by using soft dielectric rubber material or flexible plastic as an adhesive.
  • the umbrella-skirt sheath is made of dielectric polymer material such as silicon rubber, ethylene propylene diene rubber, or soft plastic etc.
  • the umbrella-skirt sheath can be integrally molded on the mandrel or sheath-covered to the mandrel.
  • the end assemblies comprise a sleeve with a tapered aperture, a flared conical body for inserting into any end of the mandrel, a locking nut and a connection member, wherein: the flared conical body is generally cone-shaped, the head of which is provided with chamfered edges preventing disengagement thereof; the sleeve is a tubular member, an inner aperture of the small diameter end of the sleeve corresponds to the diameter of the mandrel or interference-fits with the mandrel, an inner aperture of the large diameter end of the sleeve is configured into a horn shape, the inner wall of the horn shaped aperture is formed with inner teeth, an outer circumference of the large diameter end of the sleeve is provided with a protruding step; one end of the locking nut is provided with an internal thread, and a recessed step is provided inside the locking nut which engages with the protruding step; one end of the connection member is provided with an external thread which engages the
  • Orientated glass fiber is used as reinforced body material for the mandrel of the invention, and the rod stock is formed by using soft dielectric rubber material or flexible plastic as an adhesive. Therefore, the insulator will exhibit flexibility and reliable connection strength as well as favorable contamination resistance and portability. The insulator will not bend to crack or fatigue to fracture due to wind swinging during transportation and usage, thus effectively avoiding accidents of high voltage flashover or exploding bottle cracks as well as improving life span of products.
  • the invention has the above structure of the end assemblies, such flared conical body connection technique makes the connection strength between the end assembly and the mandrel higher than that of the conventional press-fit technique. During usage of the insulator, the mandrel will not easily disengage from the end assembly.
  • the size of the diameter of the flexible mandrel in accordance with the invention can be determined by tension load of the product.
  • the length of the composite hang-type insulator, the number and shape of the umbrella-skirt sheath as well as the type of end assembly are determined by the level of contamination resistance and characteristics of the application.
  • the invention can meet the using requirements of various insulation levels and strength levels.
  • the invention is also superior to existing string-type insulator or rod type composite insulator in terms of life span, safety and reliability.
  • a hang-type composite insulator comprises a mandrel 1, an umbrella-skirt sheath 2 disposed outside the mandrel 1 and assemblies 3 disposed at both ends of the mandrel 1.
  • the mandrel 1 uses orientated glass fiber as the primary reinforcing material and is then formed into a rod stock by using soft dielectric rubber material or flexible plastic as an adhesive.
  • the umbrella-skirt sheath 2 is made of dielectric polymer material such as silicon rubber, ethylene propylene diene rubber, or soft plastic etc.
  • the umbrella-skirt sheath 2 serves to protect the mandrel, increase the creepage distance and prevent contamination and can be formed into various shapes according to pressure resistant level and contamination resistant level.
  • the umbrella-skirt sheath 2 can be sheath-covered on the mandrel 1, as shown in Fig.1 , or can be integrally molded on the mandrel 1, as shown in Fig.2 .
  • a sleeve 4 with a tapered aperture, a flared conical body 5, a locking nut 6 and a connection member 7 constitute an end assembly 3, wherein the sleeve 4 is a tubular member, an inner aperture of the small diameter end of the sleeve 4e corresponds to the diameter of the mandrel 1 or interference-fits with the mandrel 1, an inner aperture of the large diameter end of the conical-opening sleeve is configured into a horn shape, the inner wall of the horn shaped aperture is formed with inner teeth, an outer circumference of the large diameter end is provided with a protruding step 41; the inner aperture of the locking nut 6 is provided with a recessed step 61, and one end of the inner-aperture of the locking nut 6 is provided with an internal thread 62; the connection member 7 is provided with an external thread 71 which engages the internal thread 62.
  • the sleeve 4 is passed through the locking nut 6 so that the protruding step 41 of the sleeve 4 abuts against the recessed step 61 of the locking nut 6. Then, the mandrel 1 covered with the umbrella-skirt sheath 2 is passed through the small diameter end of the sleeve 4 until the mandrel 1 exceeds a certain distance. After that, the flared conical body 5 is inserted into the mandrel 1 along the axial direction of the mandrel 1 so that the mandrel 1 is expanded. Next, the mandrel 1 is pulled in the reverse direction so that the expanded portion of the mandrel 1 presses against the inner wall of the horn shaped aperture. The inner teeth provided on the inner wall of the horn shaped aperture can effectively increase the friction coefficient. Finally, the connection member 7 is screwed into the locking nut 6 to provide a further pressure on it.
  • connection member 7 can be of various shapes for the sake of its connection with electricity transmission lines and telegraph poles. As shown in Fig.1 , the end portion of the connection member 7 is of a ball-head shape. As shown in Fig.2 , the end portion is of a ball-socket shape. As shown in Fig.5 , the end portion is of a flying ring shape.
  • an equalizer ring 8 is further provided outside the end assembly 3, as shown in Figs.5 and 6 .

Description

  • The invention relates to a composite insulator for use in electrical lines or electrified railways, in particular, to a hang-type composite insulator.
  • CN 1 239 803 A teaches a hang-type composite insulator, comprising a mandrel, an umbrella-skirt sheath disposed outside the mandrel and an end assembly disposed at one end of the mandrel, the mandrel has the form of a rod stock; the end assembly comprises a sleeve with a tapered aperture, a flared conical body for inserting into any end of the mandrel, a locking nut and a connection member, wherein the flared conical body is generally cone-shaped, the sleeve is a tubular member, an inner aperture of the small diameter end of the sleeve corresponds to the diameter of the mandrel, an inner aperture of the large diameter end of the sleeve is configured into a horn shape.
  • EP 38 475 A discloses an insulator having a glass fiber reinforced plastic rod to which an end cap is attached. The end cap is pressed onto the rod after which and end peace is screwed on to it.
  • An insulator is typically made of insulator material with extremely high electrical resistance. The insulator serves to space out conductors having different electrical potentials apart and allows no electrical current flowing therebetween so that the electric current will circulate in a certain direction. Currently, hang-type insulators at home and abroad can be divided into ceramic insulators, glass insulators and composite insulators. Ceramic and glass insulators are fragile and susceptible to contamination, tending to cause accidents such as high voltage flashover and exploding bottle cracks. The mandrel of common rod-shaped composite insulators exhibit poor flexibility in resisting bending and are fragile as well. Today, insulators made of organic composite materials, i.e. composite insulators, are widely used at home and abroad.
  • End attachments of an insulator are used to connect and fix the insulator to electricity transmission lines and telegraph poles. These end attachments not only sustain various external forces inside the system and pressure produced by transmission wires themselves, but also sustain wind forces from uncertain directions and pressure resulted from accumulated snow during a long term use. Therefore, the connecting quality between end attachments and the mandrel is a significant symbol which directly affects the safety and reliability of product operation. A commonly used connecting technique is to connect a mandrel with end attachments by press-fit assembly process. However, such process tends to induce cracking, loosening and aging and leads to poor stability, thus becoming a potential safety hazard. Currently, it is still a big problem to improve the connecting quality in the field of composite insulators both at home and abroad.
  • The object of the invention is to, addressing the above existing problems and shortcomings, provide a hang-type composite insulator which has good flexibility, contamination and cracking resistance. In addition, such hang-type composite insulator can generate a connection which is safe and has high strength, good stability, durability and anti-aging capability.
  • This object is solved by the insulator according to claim 1. The technical solution of the invention is achieved as follows.
  • This hang-type composite insulator comprises among others a mandrel (1), an umbrella-skirt sheath (2) disposed outside the mandrel (1) and end assemblies (3) disposed at both ends of the mandrel (1), the orientated glass fiber is used as reinforced body material for mandrel and is then formed into a rod stock by using soft dielectric rubber material or flexible plastic as an adhesive.
  • In order to enhance pressure and contamination resistant capabilities, the umbrella-skirt sheath is made of dielectric polymer material such as silicon rubber, ethylene propylene diene rubber, or soft plastic etc. The umbrella-skirt sheath can be integrally molded on the mandrel or sheath-covered to the mandrel.
  • The end assemblies comprise a sleeve with a tapered aperture, a flared conical body for inserting into any end of the mandrel, a locking nut and a connection member, wherein: the flared conical body is generally cone-shaped, the head of which is provided with chamfered edges preventing disengagement thereof; the sleeve is a tubular member, an inner aperture of the small diameter end of the sleeve corresponds to the diameter of the mandrel or interference-fits with the mandrel, an inner aperture of the large diameter end of the sleeve is configured into a horn shape, the inner wall of the horn shaped aperture is formed with inner teeth, an outer circumference of the large diameter end of the sleeve is provided with a protruding step; one end of the locking nut is provided with an internal thread, and a recessed step is provided inside the locking nut which engages with the protruding step; one end of the connection member is provided with an external thread which engages the internal thread, the other end of the connection member is configured into a ball-head shape, a ball-socket shape, or a flying ring shape to facilitate connection and fixation; an equalizer ring is further provided on end assemblies to make the connection between end assemblies and the mandrel more stable.
  • Orientated glass fiber is used as reinforced body material for the mandrel of the invention, and the rod stock is formed by using soft dielectric rubber material or flexible plastic as an adhesive. Therefore, the insulator will exhibit flexibility and reliable connection strength as well as favorable contamination resistance and portability. The insulator will not bend to crack or fatigue to fracture due to wind swinging during transportation and usage, thus effectively avoiding accidents of high voltage flashover or exploding bottle cracks as well as improving life span of products. In addition, the invention has the above structure of the end assemblies, such flared conical body connection technique makes the connection strength between the end assembly and the mandrel higher than that of the conventional press-fit technique. During usage of the insulator, the mandrel will not easily disengage from the end assembly. Cracks due to stress fatigue or processing defects and fatigued fracture caused by wind swinging will not happen. The size of the diameter of the flexible mandrel in accordance with the invention can be determined by tension load of the product. The length of the composite hang-type insulator, the number and shape of the umbrella-skirt sheath as well as the type of end assembly are determined by the level of contamination resistance and characteristics of the application. The invention can meet the using requirements of various insulation levels and strength levels. The invention is also superior to existing string-type insulator or rod type composite insulator in terms of life span, safety and reliability.
  • Hereinafter, the invention will be further described with reference to the accompanied drawings.
    • Figure 1 is a schematic structure view of an umbrella-skirt sheath being socket-coupled to the mandrel in accordance with the invention;
    • Figure 2 is a schematic structure view of an umbrella-skirt sheath being integrally molded to the mandrel in accordance with the invention;
    • Figure 3 is a partially sectional view of the insulator in accordance with the invention;
    • Figure 4 is a schematic exploded view of the invention;
    • Figure 5 is a partially sectional view of the invention provided with an equalizer ring; and
    • Figure 6 is a schematic exploded view of the invention provided with an equalizer ring.
  • As shown in the Figures, a hang-type composite insulator comprises a mandrel 1, an umbrella-skirt sheath 2 disposed outside the mandrel 1 and assemblies 3 disposed at both ends of the mandrel 1. The mandrel 1 uses orientated glass fiber as the primary reinforcing material and is then formed into a rod stock by using soft dielectric rubber material or flexible plastic as an adhesive.
  • The umbrella-skirt sheath 2 is made of dielectric polymer material such as silicon rubber, ethylene propylene diene rubber, or soft plastic etc. The umbrella-skirt sheath 2 serves to protect the mandrel, increase the creepage distance and prevent contamination and can be formed into various shapes according to pressure resistant level and contamination resistant level. The umbrella-skirt sheath 2 can be sheath-covered on the mandrel 1, as shown in Fig.1, or can be integrally molded on the mandrel 1, as shown in Fig.2.
  • As shown in Figs. 3 and 4, a sleeve 4 with a tapered aperture, a flared conical body 5, a locking nut 6 and a connection member 7 constitute an end assembly 3, wherein the sleeve 4 is a tubular member, an inner aperture of the small diameter end of the sleeve 4e corresponds to the diameter of the mandrel 1 or interference-fits with the mandrel 1, an inner aperture of the large diameter end of the conical-opening sleeve is configured into a horn shape, the inner wall of the horn shaped aperture is formed with inner teeth, an outer circumference of the large diameter end is provided with a protruding step 41; the inner aperture of the locking nut 6 is provided with a recessed step 61, and one end of the inner-aperture of the locking nut 6 is provided with an internal thread 62; the connection member 7 is provided with an external thread 71 which engages the internal thread 62.
  • When assembling, firstly, the sleeve 4 is passed through the locking nut 6 so that the protruding step 41 of the sleeve 4 abuts against the recessed step 61 of the locking nut 6. Then, the mandrel 1 covered with the umbrella-skirt sheath 2 is passed through the small diameter end of the sleeve 4 until the mandrel 1 exceeds a certain distance. After that, the flared conical body 5 is inserted into the mandrel 1 along the axial direction of the mandrel 1 so that the mandrel 1 is expanded. Next, the mandrel 1 is pulled in the reverse direction so that the expanded portion of the mandrel 1 presses against the inner wall of the horn shaped aperture. The inner teeth provided on the inner wall of the horn shaped aperture can effectively increase the friction coefficient. Finally, the connection member 7 is screwed into the locking nut 6 to provide a further pressure on it.
  • The connection member 7 can be of various shapes for the sake of its connection with electricity transmission lines and telegraph poles. As shown in Fig.1, the end portion of the connection member 7 is of a ball-head shape. As shown in Fig.2, the end portion is of a ball-socket shape. As shown in Fig.5, the end portion is of a flying ring shape.
  • In order that the connection between the end assembly 3 and the mandrel 1 is more stable, an equalizer ring 8 is further provided outside the end assembly 3, as shown in Figs.5 and 6.

Claims (6)

  1. A hang-type composite insulator, comprising a mandrel (1), an umbrella-skirt sheath (2) disposed outside the mandrel (1) and end assemblies (3) disposed at both ends of the mandrel (1), characterized in that the mandrel (1) comprises orientated glass fiber as reinforced body material for the mandrel (1), the mandrel (1) has the form of a rod stock and comprises soft dielectric rubber material or flexible plastic as an adhesive; the end assemblies (3) comprise a sleeve (4) with a tapered aperture, a flared conical body (5) for inserting into any end of the mandrel (1), a locking nut (6) and a connection member (7), wherein:
    the flared conical body (5) is generally cone-shaped, the head of which is provided with chamfered edges for preventing disengagement thereof;
    the sleeve (4) is a tubular member, an inner aperture of the small diameter end of the sleeve (4) corresponds to the diameter of the mandrel (1) or interfererice-fits with the mandrel (1), an inner aperture of the large diameter end of the sleeve (4) is configured into a horn shape, the inner wall of the horn shaped aperture is formed with inner teeth, an outer circumference of the large diameter end of the sleeve (4) is provided with a protruding step (41);
    one end of the inner aperture of the locking nut (6) is provided with an internal thread (62), and a recessed step (61) is provided inside the aperture which engages with the protruding step (41);
    one end of the connection member (7) is provided with an external thread (71) which engages the internal thread (62).
  2. A hang-type composite insulator according to Claim 1, characterized in that, an end equalizer ring (8) is provided on the outer circumference of the small diameter end of the sleeve (4).
  3. A hang-type composite insulator according to Claim 1 or 2, characterized in that, the other end of the connection member (7) is configured into a ball-head shape, a ball-socket shape, or a flying ring shape.
  4. A hang-type composite insulator according to Claim 1 or 2, characterized in that, the umbrella-skirt sheath (2) is made of dielectric polymer material.
  5. A hang-type composite insulator according to Claim 4, characterized in that, the umbrella-skirt sheath (2) is integrally injection-molded to the mandrel (1).
  6. A hang-type composite insulator according to Claim 4, characterized in that, the umbrella-skirt sheath (2) is sheath-covered to the mandrel (1).
EP07845658.9A 2006-11-24 2007-11-20 A hang-type composite insulator Not-in-force EP2117013B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNB2006101237274A CN100481276C (en) 2006-11-24 2006-11-24 A suspension type combined insulator
PCT/CN2007/003271 WO2008061446A1 (en) 2006-11-24 2007-11-20 A hang-type composite insulator

Publications (3)

Publication Number Publication Date
EP2117013A1 EP2117013A1 (en) 2009-11-11
EP2117013A4 EP2117013A4 (en) 2013-05-01
EP2117013B1 true EP2117013B1 (en) 2017-04-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07845658.9A Not-in-force EP2117013B1 (en) 2006-11-24 2007-11-20 A hang-type composite insulator

Country Status (3)

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EP (1) EP2117013B1 (en)
CN (1) CN100481276C (en)
WO (1) WO2008061446A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100481276C (en) * 2006-11-24 2009-04-22 广州市时代橡塑实业有限公司 A suspension type combined insulator
CN102024533B (en) * 2010-05-17 2012-07-18 河北硅谷化工有限公司 Manufacturing method of composite flexible insulator
CN101859618A (en) * 2010-05-24 2010-10-13 华北电力科学研究院有限责任公司 Composite material flexible insulation device for high voltage transmission lines
CN102568714A (en) * 2010-12-30 2012-07-11 河南省电力公司焦作供电公司 Combined type insulator made from glass reinforced plastic
CN103123833B (en) * 2013-02-05 2015-07-22 宜兴市溢洋墨根材料有限公司 Overhung composite insulator for supergrid
CN110349715A (en) * 2019-08-01 2019-10-18 萍乡市环宇电瓷厂 A kind of column support type radix saposhnikoviae insulator

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FR2412150A1 (en) * 1977-12-14 1979-07-13 Ceraver LINE ELECTRIC INSULATOR IN ORGANIC MATTER
DE3014601A1 (en) * 1980-04-16 1981-10-22 Karl Pfisterer Elektrotechnische Spezialartikel Gmbh & Co Kg, 7000 Stuttgart FITTING FOR THE PRODUCTION OF A CONNECTION WITH A HIGH TENSILE STRENGTH WITH A GLASS FIBER REINFORCED PLASTIC ROD
CA2137659C (en) * 1992-06-12 1998-09-22 Jiri Pazdirek Composite insulator
US5877453A (en) * 1997-09-17 1999-03-02 Maclean-Fogg Company Composite insulator
CN1239803A (en) * 1998-06-20 1999-12-29 山东省垦利县新型电力器材厂 Internally wedged composite insulator with high long-term strength
US6501029B1 (en) * 1999-12-03 2002-12-31 Electro Composites, Inc. High-voltage homogeneous co-curing composite insulator
FR2825183B1 (en) * 2001-05-22 2003-07-18 Sediver COMPOSITE INSULATOR WITH AN OPTICAL FIBER GUIDED BETWEEN A METAL FRAME AND THE SUPPORT ROD
FR2842644B1 (en) * 2002-07-18 2004-08-20 Sediver MANUFACTURE OF A COMPOSITE INSULATOR BODY
CN200972810Y (en) * 2006-11-24 2007-11-07 广州市时代橡塑实业有限公司 Suspension composite insulator
CN100481276C (en) * 2006-11-24 2009-04-22 广州市时代橡塑实业有限公司 A suspension type combined insulator

Also Published As

Publication number Publication date
EP2117013A1 (en) 2009-11-11
CN1963960A (en) 2007-05-16
CN100481276C (en) 2009-04-22
EP2117013A4 (en) 2013-05-01
WO2008061446A1 (en) 2008-05-29

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