WO1991017554A1 - Circuit de surtension - Google Patents

Circuit de surtension Download PDF

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Publication number
WO1991017554A1
WO1991017554A1 PCT/SE1991/000250 SE9100250W WO9117554A1 WO 1991017554 A1 WO1991017554 A1 WO 1991017554A1 SE 9100250 W SE9100250 W SE 9100250W WO 9117554 A1 WO9117554 A1 WO 9117554A1
Authority
WO
WIPO (PCT)
Prior art keywords
surge arrester
polymer insulator
tension rods
insulator
elements
Prior art date
Application number
PCT/SE1991/000250
Other languages
English (en)
Inventor
Jan Lundquist
Bengt Thors
Original Assignee
Asea Brown Boveri Ab
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 Asea Brown Boveri Ab filed Critical Asea Brown Boveri Ab
Publication of WO1991017554A1 publication Critical patent/WO1991017554A1/fr

Links

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

Definitions

  • T e present invention relates to a surge arrester .
  • the surge arrester is provided with an elongated insulator casing made of a polymer material and is adapted to surround a plurality of surge arrester elements of a metal oxide varistor material.
  • the surge arrester elements are preferably cylindrical and arranged between two metal electrodes, end electrodes, which are each arranged at a respective end of the surge arrester.
  • the surge arrester comprises a stack of a plurality of preferably cylindrical surge arrester elements of metal oxide varistor material, which are arranged one after the other in the axial direction of the surge arrester.
  • the arrester elements are held together between two end electrodes, which are each arranged at a respective end of the surge arrester, and are surrounded by an insulator casing making contact with the envelope surfaces of the arrester elements.
  • the insulator casing is made of a polymer material, which under normal operating conditions s resistant to deformation, for example crosslinked HD (High Density) polyethylene.
  • the tension rods are usually made of a glass fibre-reinforced epoxy or another polymer or composite material with enhanced tensile strength.
  • the invention aims o provide a surge arrester whose mecha ⁇ nical strength is independent of the temperature of the surge arresters, that is to say, the insulator casing and the tension rods arranged therein are adapted to hold together the surge arrester also at the elevated tempe ⁇ ratures which, for example, arise in case of a high passage of current caused by overvoltages .
  • tne insulator casing according to the invention is adapted, in case of a breakdown, to release the overpressure generated in the form of an arc, ionized gas, through a controlled pressure relief without end electrodes cr par ? of the varistor material spreading in the surroundings as a result of uncontrolled bursting of the surge arrester.
  • a polymer insulator is adapted to surround a number of arrester elements of metal oxide varistor material. Tension rods are arranged in the polymer insulator in order to hold the arrester elements together, which are arranged between two end electrodes which are each disposed at a respect e end of the surge arrester.
  • the polymer insulator is provided with bulges. These bulges extend on the envelope surface of the polymer insulator in the axial direction of the surge arrester along the entire length of the polymer insulator.
  • ten ⁇ sion rods are arranged in the bulges.
  • the polymer casing located between the surge arrester elements and the tension rods is of such a thickness that the tension rods are thermally insulated from the surge arrester elements.
  • the increase of the envelope surface caused by the bulging provides a cooling of the tension rods. All in all, this means that the tension rods can be maintained at a low temperature independently of the tem ⁇ perature of the surge arrester elements, and the mechanical strength of the tension rods is not lost at an increase cf the temperature of the surge arrester elements.
  • the polymer insulator in a preferred embodiment arranged with voids between the surge arrester elements and the tension rods.
  • the voids are preferably arranged near the tension rods arranged in the bulges. The voids improve the thermal insulation between the surge arrester elements and the tension rods .
  • the polymer insulator is arranged with notches in order to relieve the surge arrester of pressure in a controlled manner in case of increased internal pressure, without harming the environ ⁇ ment .
  • the notches are preferably arranged in the form of weakened points at certain places in the polymer insulator, which points burst at an increase of the internal pressure and then rapidly relieve the surge arrester of pressure, thus preventing it from bursting.
  • the polymer insulator is adapted, in case of a heavy pressure increase, to burst at the notches, the possi ⁇ bilities of rapidly locating a damaged surge arrester are also improved, which shortens the repair time and the downtime in the event of breakdown.
  • a surge arrester with a polymer insulator arranged according to the invention provides additional advantages in that:
  • the wall thickness of the polymer insulator can be reduced since the tension rods are arranged in the bulges on the outside of the polymer insulator; a reduced wall thickness improves the cooling of the surge arrester elements;
  • the surge arrester with rigidly attached end electrodes can absorb deformation caused by bending load without the surge arrester elements being damaged.
  • FIG. 1 A side view and partial section of a surge arrester provided with tension rods in the insulator casing according to the invention is shown in Figure 1.
  • Figure 2 shows a side view and partial section of a preferred embodiment of the invention, in which voids have been provided between the surge arrester elements and the tension rods.
  • a surge arrester 1 according to the invention is shown in Figure 1.
  • a number of surge arrester elements 11, preferably cylindrical and made of a metal oxide varistcr material, are arranged one after the other in the axial direction of the arrester elements 11.
  • the arrester elements 11 are retained between two end electrodes 13, preferably metallic, arranged one at each end of the surge arrester 1, an insulator casing 12, preferably made of a polymer material which under normal operating conditions is resistant to deformation, is adapted to make contact with the envelope surfaces 112 of the arrester elements 11.
  • Tension rods 14 are arranged near the insulator casing 12 and the end electrodes 12 and retain the end electrodes and the stack of arrester elements 11 by means of nuts 15 or bolts.
  • the surge arrester is sealed close to the end electrodes 13 by the arrangement of a seal 16, preferably a O-ring, at each end electrode 13, which seai 16 is adapted to seal between the end electrode 13 and the insulator casing 12.
  • a seal 16 preferably a O-ring
  • seai 16 is adapted to seal between the end electrode 13 and the insulator casing 12.
  • a spring means 17 for example in the form of disc springs arranged in a spring package, is arranged close to the end electrodes 13.
  • the insulator casing 12 is provided with bulges 121 extending on the outer side of tr.e insulator casing 12 in the longitudinal direction of the surge arrester 1.
  • tension rods 14 are arranged to retain the surge arrester elements 11 and the end electrodes 13 into a surge arrester 1.
  • the insulator casing 12 is provided with creep distance extending projections 18.
  • tension rods 14 By arranging tension rods 14 in bulges 121 provided on the outer side of the insulator casing 12 according to the invention, a surge arrester is obtained for which the mechanical strength becomes essentially independent of the temperature of the surge arrester elements.
  • the tension rods 14 are thermally insulated from the surge arrester elements 11 by a plastic layer of at least 2 mm, preferably at least 5 mm, which gives the necessary temperature drop across the plastic.
  • the increased outer surface of the polymer insulator 12, caused by the bulges 121 results in improved cooling of the tension rods 14, and the insulator casing 12 can therefore be made thin.
  • the insulator casing 12 is provided with notches 122, preferably in the form of weakened points . These notches 122 burst at an increase of the internal pressure and rapidly relieve the surge arrester 1 of pressure, thus preventing if from blasting. Since the surge arrester 1 ⁇ substantially pressure-relieved by bursting of the nctcne ⁇ 122, the possibilities of rapidly locating a damaged surge arrester 1, and hence considerably shortening the repair an:: downtimes, are also improved.
  • FIG. 2 A preferred embodiment of the surge arrester 1 is shown in Figure 2.
  • voids 20 are arranged in the insulator casing 12 between the surge arrester elements 11 and the tension rods 14.
  • the voids 2 ' are arranged preferably close to the tension rods 14, whereby the thermal insulation of the tension rods 14 relative to the arrester elements 11 is further improved.
  • the two embodiments correspond to each other as regards the retention of the surge arrester by means of tension rods 14, bolts 15, seals 16, and the provision of a sufficient contact pressure by means of a spring device 17.

Landscapes

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

Abstract

Coupe-circuit de surtension (1) comprenant un empilement de plusieurs éléments cylindriques limitateurs de tension (11) en oxyde de métal pour varistor, dans lequel les éléments limitateurs de tension sont disposés l'un après l'autre entre deux électrodes d'extrémité (13) dans la direction axiale du coupe-circuit et sont entourés d'un isolant en polymère (12) qui est en contact avec la surface externe des éléments limitateurs de tension. Des tirants (14) sont disposés dans l'isolant en polymère afin de retenir les éléments limitateurs et les électrodes d'extrémité. L'isolant est constitué d'un polymère qui, dans des conditions de fonctionnement normales, résiste à la déformation et comporte sur toute sa longueur des renflements (121) disposés dans le sens axial du coupe-circuit, les tirants étant disposés dans ces renflements. Des vides (20) sont ménagés dans l'isolant polymère entre la pile d'éléments limitateurs de tension et les tirants, ces vides étant de préférence disposés près des tirants ménagés dans les renflements. L'isolant polymère comporte des encoches (122) pour lui permettre d'éclater de façon contrôlée lorsqu'il est soumis à une pression interne élevée. Les encoches prennent de préférence la forme de points faibles dans l'isolant en polymère.
PCT/SE1991/000250 1990-05-08 1991-04-05 Circuit de surtension WO1991017554A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9001641A SE466176B (sv) 1990-05-08 1990-05-08 Ventilavledare med ett isolatorhoelje i vilket dragstaenger aer anordnade
SE9001641-1 1990-05-08

Publications (1)

Publication Number Publication Date
WO1991017554A1 true WO1991017554A1 (fr) 1991-11-14

Family

ID=20379410

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1991/000250 WO1991017554A1 (fr) 1990-05-08 1991-04-05 Circuit de surtension

Country Status (3)

Country Link
AU (1) AU7884991A (fr)
SE (1) SE466176B (fr)
WO (1) WO1991017554A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0545038A1 (fr) * 1991-12-04 1993-06-09 Asea Brown Boveri Ag Parafoudre
DE4319986A1 (de) * 1993-06-11 1994-12-15 Siemens Ag Überspannungsableiter
CN1106650C (zh) * 1996-06-03 2003-04-23 株式会社日立制作所 绝缘子包层式放电器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2038720A1 (fr) * 1990-04-02 1991-10-03 Takeshi Kawamura Parafoudre

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0044802A1 (fr) * 1980-07-17 1982-01-27 Siemens Aktiengesellschaft Dispositif à résistance comportant des éléments résistifs annulaires empilés ayant un axe commun
SE460000B (sv) * 1987-12-17 1989-08-28 Asea Ab Ventilavledare

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0044802A1 (fr) * 1980-07-17 1982-01-27 Siemens Aktiengesellschaft Dispositif à résistance comportant des éléments résistifs annulaires empilés ayant un axe commun
SE460000B (sv) * 1987-12-17 1989-08-28 Asea Ab Ventilavledare

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0545038A1 (fr) * 1991-12-04 1993-06-09 Asea Brown Boveri Ag Parafoudre
CH682858A5 (de) * 1991-12-04 1993-11-30 Asea Brown Boveri Ueberspannungsableiter.
US5291366A (en) * 1991-12-04 1994-03-01 Asea Brown Boveri Ltd. Surge voltage arrester
DE4319986A1 (de) * 1993-06-11 1994-12-15 Siemens Ag Überspannungsableiter
CN1106650C (zh) * 1996-06-03 2003-04-23 株式会社日立制作所 绝缘子包层式放电器

Also Published As

Publication number Publication date
SE466176B (sv) 1992-01-07
SE9001641L (sv) 1991-11-09
SE9001641D0 (sv) 1990-05-08
AU7884991A (en) 1991-11-27

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