EP0280116A2 - Parafoudre - Google Patents

Parafoudre Download PDF

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Publication number
EP0280116A2
EP0280116A2 EP88101970A EP88101970A EP0280116A2 EP 0280116 A2 EP0280116 A2 EP 0280116A2 EP 88101970 A EP88101970 A EP 88101970A EP 88101970 A EP88101970 A EP 88101970A EP 0280116 A2 EP0280116 A2 EP 0280116A2
Authority
EP
European Patent Office
Prior art keywords
insulating
protection apparatus
lightning protection
insulating tube
plate
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.)
Granted
Application number
EP88101970A
Other languages
German (de)
English (en)
Other versions
EP0280116A3 (en
EP0280116B1 (fr
Inventor
Shinji Itami Seisakusho Mitsubishi Denki Ishibe
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP0280116A2 publication Critical patent/EP0280116A2/fr
Publication of EP0280116A3 publication Critical patent/EP0280116A3/en
Application granted granted Critical
Publication of EP0280116B1 publication Critical patent/EP0280116B1/fr
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

Definitions

  • This invention relates to lightning protection appara­tus and, more particularly, to a lightning protection appa­ratus of the type having an insulation tube in which a non-­linear resistance element is housed.
  • Lightning protection apparatus intended mainly for in­stallation at substations and the like facilities are so designed that when an overvoltage is applied by a lightning stroke, a current is discharged to the ground to reduce the overvoltage.
  • a non-linear resistance element composed principally of zinc oxide (ZnO), a kind of new ceramics, is commonly used.
  • Figs. 1 and 2 illustrated, by way of example, a light­ning protection apparatus using such conventional non-linear resistance element, which is disclosed in Japanese Patent Laid Open No. 59-7584 (1984).
  • the earthing lower side portion thereof is required to have the following three functions:
  • Fig. 3 shows another form of lightning protection ar­rangement disclosed in Japanese Utility Model Laid Open No. 59-393 (1984), in which an insulating terminal board 11 hav­ing an earth terminal 1101 embedded therein is bonded to the underside of the metal flange 101, a bursting plate 12 being uniformly pressed by a metal ring 13 and clamped by bolts 8 to the underside of the insulating terminal board 11.
  • a vent hold 1103 which connects through an internal space of the insulating tube 1 to the upper side of the bursting plate 12.
  • the earthing side end portion thereof is constructed as above described and accordingly the required three functions are performed by a combination of two or more parts.
  • This natu­rally involves a relatively large number of parts, which is disadvantageous from the standpoint of assembly operation and cost.
  • This invention is made in view of the above mentioned drawback of the prior art arrangement, and it is intended to provide a lightning protection apparatus which involves a smaller number of parts and simplified assembly work because of a single part designed to perform the three functions re­quired of the apparatus, and which is less expensive.
  • the lightning protection apparatus in accordance with the invention comprises an integrally formed metal member having functions of both an earth terminal and a bursting plate, the metal member being molded integrally with an in­sulating material and mounted as such to the earthing end of an insulating tube.
  • Fig. 4 is a longitudinal sectional view showing, by way of example, general arrangement of a lightning protection apparatus embodying the invention.
  • a zinc oxide element 2 i.e., a non-linear resistance element, supported on a support base 3 is housed in an insulating tube 1.
  • Numeral 4 designates a coil spring for fixing the zinc oxide element 2 in position.
  • the insulating tube 1 is sealed at its upper end with an upper plate 5, and at its lower end with an insulating plate 14 characterizing the invention.
  • An internal current flowing through the zinc oxide element 2 shown with arrow a and an internal current flowing along the surface of the in­sulating tube 1 shown with arrow b are separated by the in­sulating plate 14.
  • Fig. 5 is a longitudinal sectional view showing in de­tail a first embodiment of the earthing side end portion of the lightning protection apparatus according to the inven­tion.
  • the insulating plate 14 is made of poly­ester, epoxy resin or phenol resin.
  • the insu­lating plate 14 is mounted on the earthing side end portion of the insulating tube 1, the insulating plate 14 constitu­ting a characteristic feature of the invention.
  • the insu­lating plate 14 is so molded as to enclose a metal member which is formed of a bursting plate 1403 and an earth termi­nal 1401 integrally.
  • a metal flange 101 is bonded to the outer periphery of the earthing side end portion of the insulating tube 1, and the insulating plate 14 is clamped by bolts 8 to the metal flange 101 through insulating washers 9.
  • a median portion of the insulating plate 14 is shaped in a membrane-like pattern, and between the membrane-like portion and the support base 3 there is defined a space 30.
  • This space 30 communicates with the interior of the insulat­ing tube 1 through a vent hole 301 extending through the support base 3. Therefore, when there is an internal pres­sure rising in the insulating tube 1, a gas stream flows from the interior of the insulating tube 1 toward the burst­ing plate 1403 through the vent hole 301, whereby the burst­ing plate 1403 will burst to release the pressure.
  • An earth terminal 1404 is formed, extending laterally from the insulating plate 14.
  • the lightning protection apparatus of the present invention is constructed as above described, performance of aforesaid three functions, namely, (1) keeping the interior of the insulating tube airtight, (2) gas discharge in case of a gas pressure rising in the interior of the insulating tube, and (3) separation of the current flowing in the zinc oxide element from the current flowing along the outer sur­face of the insulating tube, is assured by a single part, that is, the insulating plate 14.
  • the O-ring is inter­posed between the insulating tube 1 and the insulating mem­ber which constitutes both the earth terminal 1401 and the bursting plate 1403, but alternatively, as shown in Fig. 6 as a second embodiment, the O-ring may be interposed between the insulating plate 14 and the insulating tube 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)
EP19880101970 1987-02-25 1988-02-11 Parafoudre Expired - Lifetime EP0280116B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4018587A JPS63208202A (ja) 1987-02-25 1987-02-25 避雷装置
JP40185/87 1987-02-25

Publications (3)

Publication Number Publication Date
EP0280116A2 true EP0280116A2 (fr) 1988-08-31
EP0280116A3 EP0280116A3 (en) 1989-04-05
EP0280116B1 EP0280116B1 (fr) 1993-09-08

Family

ID=12573722

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880101970 Expired - Lifetime EP0280116B1 (fr) 1987-02-25 1988-02-11 Parafoudre

Country Status (4)

Country Link
EP (1) EP0280116B1 (fr)
JP (1) JPS63208202A (fr)
CA (1) CA1332075C (fr)
DE (1) DE3883802T2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU637421B2 (en) * 1989-11-07 1993-05-27 Ngk Insulators, Ltd. Electrical cutout for lightning surge protection

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007027411A1 (de) * 2007-06-11 2008-12-18 Siemens Ag Überspannungsableiteranordnung
CN112368789B (zh) * 2018-06-15 2022-07-29 西门子能源全球有限公司 具有压力卸减装置的过电压放电器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4298900A (en) * 1980-01-02 1981-11-03 Avdeenko Boris K Overvoltage protective device
EP0059078A1 (fr) * 1981-02-19 1982-09-01 Electric Power Research Institute, Inc Limiteur de surtension
EP0217021A1 (fr) * 1985-09-02 1987-04-08 BBC Brown Boveri AG Dériveur de surtension et son procédé de fabrication

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4298900A (en) * 1980-01-02 1981-11-03 Avdeenko Boris K Overvoltage protective device
EP0059078A1 (fr) * 1981-02-19 1982-09-01 Electric Power Research Institute, Inc Limiteur de surtension
EP0217021A1 (fr) * 1985-09-02 1987-04-08 BBC Brown Boveri AG Dériveur de surtension et son procédé de fabrication

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU637421B2 (en) * 1989-11-07 1993-05-27 Ngk Insulators, Ltd. Electrical cutout for lightning surge protection

Also Published As

Publication number Publication date
DE3883802T2 (de) 1994-01-13
JPS63208202A (ja) 1988-08-29
DE3883802D1 (de) 1993-10-14
EP0280116A3 (en) 1989-04-05
EP0280116B1 (fr) 1993-09-08
CA1332075C (fr) 1994-09-20

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