EP0493134B1 - Überspannungsableiterisolator - Google Patents

Überspannungsableiterisolator Download PDF

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Publication number
EP0493134B1
EP0493134B1 EP19910312070 EP91312070A EP0493134B1 EP 0493134 B1 EP0493134 B1 EP 0493134B1 EP 19910312070 EP19910312070 EP 19910312070 EP 91312070 A EP91312070 A EP 91312070A EP 0493134 B1 EP0493134 B1 EP 0493134B1
Authority
EP
European Patent Office
Prior art keywords
insulating cylinder
housing
lightning
lightning arresting
arresting 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.)
Expired - Lifetime
Application number
EP19910312070
Other languages
English (en)
French (fr)
Other versions
EP0493134A1 (de
Inventor
Tetsuya Nakayama
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.)
NGK Insulators Ltd
Original Assignee
NGK Insulators Ltd
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 NGK Insulators Ltd filed Critical NGK Insulators Ltd
Publication of EP0493134A1 publication Critical patent/EP0493134A1/de
Application granted granted Critical
Publication of EP0493134B1 publication Critical patent/EP0493134B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/12—Overvoltage protection resistors
    • H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/12—Overvoltage protection resistors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T1/00—Details of spark gaps
    • H01T1/15—Details of spark gaps for protection against excessive pressure

Definitions

  • the present invention relates to a lightning arresting insulator, and more specifically, to a lightning arresting insulator which discharges a lightning induced surge currents in power transmission lines to the ground.
  • the insulator suppresses or cuts off the follow current of the surge to prevent ground faults.
  • the lightning arresting insulator 60 (Fig. 5) disclosed in Japanese Patent Publication No. 61-151913 is designed so that electrodes 51 and 52 for the ground side and applied voltage side are securely coupled to the respective ends of an insulating cylinder 50.
  • Current-limiting varistors 53 with nonlinear voltage-current characteristics are retained in the insulating cylinder 50.
  • the electrodes 51 and 52 are electrically connected at their ends to the respective ends of the current-limiting varistors 53.
  • a housing 55 having a plurality of sheds 54 is formed on the outer wall of the insulating cylinder 50.
  • a plurality of pressure-release holes 56 are made in the inner surface of the insulating cylinder 50. In forming the housing 55, an insulating material is injected through the pressure-release holes 56 to form an inner housing wall 57.
  • pin holes may infrequently be made in the housing 55 and in the insulating materials that fill the pressure-release holes 56. At times, the pin holes will reach the current-limiting elements 53, which permits moisture from the ambient air to contact the varistor material. This deteriorates the dielectric or insulating strength of the lightening arresting insulator.
  • the lightning arresting insulator 110 (Fig.6) disclosed in Japanese Utility Model Publication No. 1-96739 is designed so that electrodes 101 and 102 for the ground side and applied voltage side respectively, are securely coupled to the respective ends of an insulating tube 100 having a plurality of resin sheds.
  • the insulating tube 100 contains a plurality of current-limiting varistors 105 having nonlinear voltage-current characteristics.
  • the electrodes 101 and 102 are electrically connected at their ends to the respective ends of the current-limiting varistor stack 105.
  • the insulating tube 100 has a plurality of recesses 103 formed in the outer wall, thereby providing thin wall portions 104 for releasing pressure.
  • the lightning arresting insulator 110 does not require an insulating cylinder and comprises only the insulating tube 100 which has the thin pressure-releasing wall portions 104 formed on the outer surface.
  • extended use of a lightening arresting insulator with this structure under severe dirt conditions will weaken the surface of the insulating tube 100 due to corrosion caused by current leaks and corona discharge. Accordingly, cracks or pin holes will develop, which may extend entirely through the thin wall portions. In such a situation, humidity will enter inside through the cracks or the pin holes, deteriorating the dielectric or insulating strength of this lightening arresting insulator 110.
  • this lightning arresting insulator 110 has the thin wall portions exposed through the outer surface of the insulating tube 100. In the manufacturing process, therefore, workers may accidentally hit the thin wall portions will tools or the like, breaking the insulating tube 100. Or, while the lightening arresting insulator is in use, birds may peck at the thin wall portions, damaging the insulating tube 100. Furthermore, dirt or the like may be deposited in the recesses 103 that are forming the thin wall portions 104, thereby deteriorating the dielectric or insulating strength of the lightening arresting insulator.
  • Document EP 393 854 discloses a lightening arresting insulator corresponding to the introductory position of Claim 1, the insulator being provided with an insulating cylinder and a housing on the outer wall of the cylinder longitudinally extending grooves being featured in the outer surface of the cylinder.
  • an insulating cylinder 1 is formed of a durable reinforced resin having excellent weathering resistance.
  • One suitable resin is epoxy resin-impregnated FRP (fiber reinforced plastics).
  • An electrode 2 on the ground side is securely fitted over the top end of the insulating cylinder 1, and a flange 3 is integrally formed on the outer wall of the electrode 2.
  • the lightning arresting insulator is attached to an adaptor provided on the cross arm of a transmission tower (not shown).
  • An electrode 4 having a cylindrical bottom on the applied voltage side is securely fitted into the bottom end of the insulating cylinder 1.
  • a bracket 5 is integrally and protrusively formed on the bottom surface.
  • An arcing horn (not shown) on the ground side is attached to the bracket 5 in such a way that the arcing horn faces an arcing horn on the applied voltage side, with a given air gap therebetween.
  • a rim 6 is formed on the inner top surface of the electrode 4.
  • a conductor 7 on the applied voltage side is fitted into the rim 6.
  • Current-limiting varistors 8 essentially made of zinc oxide having a nonlinear voltage-current characteristic are stacked in series on the upper surface of the conductor 7 on the applied voltage side.
  • a conductor 9 on the ground side is provided on the upper surface of the topmost current-limiting varistor 8, and also serves as a spring receiver.
  • a ring 10 is screwed into a threaded portion 11 on the inner wall of the upper end of the electrode 2 on the ground side.
  • a coil spring 14 having a conductive foil 13 is inserted between a conductor 12 fitted into the ring 10 and the conductor 9 on the ground side. The coil spring 14 urges the current-limiting varistors 8 to be securely pressed between the conductors 7 and 9 respectively on the applied voltage side and the ground side.
  • An insulating cap 15 is fitted over the top end of the electrode 2 on the ground side to seal the upper opening of the electrode 2.
  • An insulating layer 16 is formed in the sealed space between the insulating cylinder 1 and the current-limiting varistors 8. According to this embodiment, room-temperature thermosetting silicone rubber is filled in that space to form the insulating layer 16.
  • a plurality of slits 17, are provided on the outer wall of the insulating cylinder 1 such that they extend in the axial direction of the insulating cylinder 1.
  • the reason why the slits are provided at two locations is that this is the minimum number of slits required in view of the operating specifications of the arrestor. Specifically, the accident current and the current flowing time permitted to discharge the voltage.
  • This slit arrangement may differ depending on the above conditions.
  • the insulating cylinder 1 will be easily torn and less durable.
  • the number of the locations of the slits on the outer wall of the insulating cylinder 1, and the number of the slits aligned in the axial direction depend on the pressure-releasing conditions. It is therefore important not to make the slit gaps too narrow.
  • the slits 17 are thus made to provide thin wall portions 18 for releasing pressure on the surface of the insulating cylinder 1.
  • an elastic insulator 19 in the form of a room-temperature thermosetting rubber, is filled in each slit 17.
  • the housing 20 made of the high temperature thermosetting silicone rubber, the lightening arresting insulator can keep the water-repellent property while in use outside for a long period of time. Compared with other cover materials, such as of EPDM or resins, the dirt withstanding characteristics of the lightening arresting insulator can be improved without changing the length of the housing 20 (which corresponds to the surface leak distance).
  • the housing 20 has a plurality of sheds 21 formed on the outer wall. The upper and lower ends of the housing 20 extend to the outer surfaces of the electrodes 2 and 4 on the ground side and applied voltage side, respectively, thus ensuring the airtight condition between the housing 20 and the electrodes 2 and 4.
  • a lightning surge current flows through a power-transmission line with the lightning arresting insulator attached to the cross arm of a transmission tower.
  • the current starts to be discharged (flash-over) from arcing horns (not shown) on the power-transmission line to arcing horns or series gaps (also not shown) attached to the lower end of the lightening arresting insulator.
  • the current runs through the electrode 4, the conductive fixture 7, the current-limiting varistors 8, the conductor 9, the foil 13, the conductor 12, the ring 10 to the electrode 2.
  • the lightning surge current finally runs to the transmission tower through the adaptor (not shown) to be discharged to the ground.
  • a follow current which follows is limited and then interrupted by the series gaps and the current-limiting varistors elements 8.
  • the current-limiting elements 8 are rendered conductive, and then a current flows through the lightning arresting insulator in response to a drive voltage, thus generating a high-temperature and high-pressure gas arc inside the lightning arresting insulator.
  • the gas arc is transmitted to the thin wall portions 18 through the insulating layer 16 in the sealed space between the insulating cylinder 1 and the current-limiting elements 8.
  • the gas arc is then rapidly released outside through the thin-wall portions 18 and part of the housing 20.
  • the lightening arresting insulator will not therefore be damaged as a whole.
  • a plurality of slits 17 are provided in the outer surface of the insulating cylinder 1 to form the pressure-releasing thin wall portions 18.
  • the thin wall portions 18 can suppress water from passing therethrough so that the airtight condition inside the insulating cylinder 1 can be kept.
  • the lightning arresting insulator according to this embodiment has a rubbery elastic insulator 19 in the slits 17 on the outer wall of the insulating cylinder 1. Because of the elastic insulator 19, the thin wall portions 18 are not exposed directly through the outer wall of the insulating cylinder 1.
  • the lightning arresting insulator in this embodiment differs from the conventional from arresting insulators which do not have an insulating cylinder but rather have thin wall portions formed on the outer surface of the insulating tube of a polymer material. More specifically, the thin wall portions 18 of the lightning arresting insulator according to this embodiment will not be hit by tools or the like in the manufacturing process so are unlikely to be damaged or broken by such an accident.
  • the slits 17 can be easily formed in the outer wall of the insulating cylinder 1 through post fabrication working.
  • the present invention is not limited to the structure of the above-described embodiment, but for example can be modified and worked as follows.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Insulators (AREA)
  • Thermistors And Varistors (AREA)

Claims (8)

  1. Blitz- bzw. Überspannungsableiter-lsolator mit einem Druckfreisetzungsmechanismus zum Freisetzen von Druck, wenn ein Blitzschlag-Stromstoß in eine Hochspannungsleitung fließt, umfassend:
    einen Isolierzylinder (1) mit einer Vielzahl sich in Längsrichtung erstreckender Rillen (1 7) in seiner Außenfläche;
    nicht-lineare Widerstände (8) im Isolierzylinder (1) und Elektroden (2,4) an den Enden des Isolierzylinders (1) und elektrisch an die nichtlinearen Widerstände (8) angeschlossen; und
    ein Gehäuse (20) an der Außenwand des Isolierzylinders (1)
    dadurch gekennzeichnet, daß die sich in Längsrichtung erstreckenden Rillen (17) Ende-an- bzw. -zu-Ende aufeinander ausgerichtet und in Längsrichtung beabstandet sind; und daß
    ein elastisches Isolatormaterial (19) in jede der Vielzahl von Rillen (17) gefüllt ist.
  2. Blitz- bzw. Überspannungsableiter-lsolator nach Anspruch 1, worin das Gehäuse (20) und das elastische Isolatormaterial (19), das die Rillen (17) füllt, einstückig ausgebildet sind.
  3. Blitz- bzw. Überspannungsableiter-lsolator nach Anspruch 1 oder 2, worin ein Isoliergas in einem luftdichten Raum zwischen dem Isolierzylinder (1) und den Strombegrenzungselementen (8) eingeschlossen ist.
  4. Blitz- bzw. Überspannungsableiter-lsolator nach Anspruch 3, worin das Isoliergas Schwefelhexafluorid ist.
  5. Blitz- bzw. Überspannungsableiter-lsolator nach einem der Ansprüche 1 bis 4, worin obere und untere Endabschnitte des Gehäuses (20) sich zu Außenflächen der Elektroden (2,4) auf der geerdeten Seite und der Seite mit angelegter Spannung erstrecken.
  6. Blitz- bzw. Überspannungsableiter-lsolator nach einem der Ansprüche 1 bis 5, worin das Gehäuse (20) aus einem bei hoher Temperatur aushärtenden Kautschuk besteht.
  7. Blitz- bzw. Überspannungsableiter-lsolator nach einem der Ansprüche 1 bis 5, worin das Gehäuse (20) aus Ethylenpropylenkautschuk (EPDM) besteht.
  8. Blitz- bzw. Überspannungsableiter-lsolator nach einem der Ansprüche 1 bis 7, worin eine der Elektroden eine erdungsseitige Elektrode ist und einen einstückig (damit) ausgebildeten Flansch (3) umfaßt und die andere Elektrode (4), die sich auf der Seite mit angelegter Spannung befindet, einen (damit) einstückig ausgebildete(n) Träger bzw. Stütze (5) enthält;
    ein zylindrischer Leiter (9) zwischen einem erdungsseitigen Ende des Strombegrenzungselementstapels (8) angeordnet ist und als Federaufnahme bzw. -sitz dient;
    eine Schraubenfeder (14) zwischen dem zylindrischen Leiter und der erdungsseitigen Elektrode (2) angeordnet ist; und
    das Gehäuse (20) aus einem bei Raumtemperatur aushärtenden Silikonkautschuk gebildet ist.
EP19910312070 1990-12-28 1991-12-28 Überspannungsableiterisolator Expired - Lifetime EP0493134B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP417347/90 1990-12-28
JP41734790A JPH07118237B2 (ja) 1990-12-28 1990-12-28 避雷碍子

Publications (2)

Publication Number Publication Date
EP0493134A1 EP0493134A1 (de) 1992-07-01
EP0493134B1 true EP0493134B1 (de) 1996-03-27

Family

ID=18525467

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910312070 Expired - Lifetime EP0493134B1 (de) 1990-12-28 1991-12-28 Überspannungsableiterisolator

Country Status (2)

Country Link
EP (1) EP0493134B1 (de)
JP (1) JPH07118237B2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104298833A (zh) * 2014-10-30 2015-01-21 国网电力科学研究院武汉南瑞有限责任公司 组合式复合材料杆塔雷击仿真模型生成方法
CN110998756A (zh) * 2017-08-16 2020-04-10 西门子股份公司 过电压防护放电器和用于过电压防护放电器的制造方法

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107301907B (zh) * 2017-07-19 2023-01-20 国网湖南省电力公司 一种防冰防雷绝缘子
CN111627622A (zh) * 2020-06-05 2020-09-04 江西百新电瓷电气有限公司 10kv自动调节防雷冰具有压敏装置的瓷质绝缘子及其制作方法
CN113611570A (zh) * 2021-07-28 2021-11-05 台州熠嘉电气科技有限公司 一种永磁机构驱动的高压开关设备
CN114035002B (zh) * 2021-11-11 2024-04-16 国网河南省电力公司商丘供电公司 一种高压输电线路绝缘子安全检测装置
WO2023242115A1 (en) * 2022-06-13 2023-12-21 Hitachi Energy Ltd Enhanced composite wrapped surge arrester and methods of providing the same
CN115085127B (zh) * 2022-07-29 2023-04-14 福建永福电力设计股份有限公司 一种线路支柱绝缘子与绝缘导线的绑扎材料

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4424547A (en) * 1980-11-04 1984-01-03 General Electric Company Surge suppressor construction
US4930039A (en) * 1989-04-18 1990-05-29 Cooper Industries, Inc. Fail-safe surge arrester
FR2646957B1 (fr) * 1989-05-12 1994-02-04 Sediver Ste Europ Isolateurs Ver Enveloppe etanche a base d'enroulement filamentaire, et parafoudre composite en faisant application

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104298833A (zh) * 2014-10-30 2015-01-21 国网电力科学研究院武汉南瑞有限责任公司 组合式复合材料杆塔雷击仿真模型生成方法
CN104298833B (zh) * 2014-10-30 2016-04-13 国网电力科学研究院武汉南瑞有限责任公司 组合式复合材料杆塔雷击仿真模型生成方法
CN110998756A (zh) * 2017-08-16 2020-04-10 西门子股份公司 过电压防护放电器和用于过电压防护放电器的制造方法

Also Published As

Publication number Publication date
JPH07118237B2 (ja) 1995-12-18
EP0493134A1 (de) 1992-07-01
JPH04249816A (ja) 1992-09-04

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