EP0403855B1 - Insulating spacer - Google Patents

Insulating spacer Download PDF

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Publication number
EP0403855B1
EP0403855B1 EP19900110406 EP90110406A EP0403855B1 EP 0403855 B1 EP0403855 B1 EP 0403855B1 EP 19900110406 EP19900110406 EP 19900110406 EP 90110406 A EP90110406 A EP 90110406A EP 0403855 B1 EP0403855 B1 EP 0403855B1
Authority
EP
European Patent Office
Prior art keywords
insulating
unit
spacers
unit spacers
insulating spacer
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
EP19900110406
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0403855A1 (en
Inventor
Toru C/O Mitsubishi Denki K.K. Yoshikawa
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 EP0403855A1 publication Critical patent/EP0403855A1/en
Application granted granted Critical
Publication of EP0403855B1 publication Critical patent/EP0403855B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01B17/56—Insulating bodies

Definitions

  • This invention relates to an insulating spacer which is disposed between two members, such as electrodes, differing in electric potential in an electric apparatus, equipment, etc., to maintain an insulation distance between the two members.
  • Figure 1 shows a sectional view of an insulating spacer according to the prior art.
  • reference numbers 1 and 2 denote a higher- and a lower-potential electrode, as two members differing in electric potential
  • reference number 3 denotes platelike insulating barriers disposed between the electrodes 1 and 2 to prevent flash over between the electrodes.
  • Reference number 4 denotes unit spacers made of an insulating solid material and having a bar shape with a tetragonal cross section, three such unit spacers being disposed between the higher- and lower-potential electrodes 1 and 2 to maintain an insulation distance between the electrodes and to clamp each of the insulating barriers 3 between the unit spacers 4, thereby maintaining the barriers in position.
  • the unit spacers 4 and insulating barriers 3 in practical use in an electric apparatus (not shown) or the like have dispersions of their dimensions or ruggedness of their surfaces. Therefore, it is not always the case that the space between the electrodes 1 and 2, in which the unit spacers 4 are disposed, is filled completely with the insulating solid material as shown in Figure 1. Namely, a gap 5 may in some cases be generated in the space, as for instance illustrated in Figure 2.
  • the gap 5 is filled with an ambient insulating medium such as a gas (air, sulfur hexafluoride, etc.) and an insulating oil (neither shown).
  • the specific dielectric constant of the insulating medium in the gap 5 is ⁇ 1
  • the specific dielectric constants of the insulating barriers 3 and the unit spacers 4 are equally ⁇ 2
  • the length of the gap 5 generated in the space between the electrodes 1 and 2 is d1
  • the total dimension of solid insulator portions is d2
  • the potential difference between the electrodes 1 and 2 is V
  • an insulating solid material (inclusive of one which is impregnated with an insulating medium) in most cases has a higher specific dielectric constant than that of an insulating medium.
  • the conventional insulating spacers constructed as above, have had the possibility of a gap being generated to cause a local concentration of electric field on the gap.
  • the conventional insulating spacers have therefore been limited in selection of the insulating solid material, constituting the insulating spacers, and the material for the insulating medium surrounding the spacers. In some cases, it has been necessary to take such countermeasure as enlarging the distance between the electrodes or the like members to lower the average field strength therebetween.
  • This invention contemplates overcoming the above-mentioned drawbacks of the prior art.
  • an insulating spacer comprises the features of claim 1.
  • Figure 4 shows a sectional view of an insulating spacer according to one embodiment of this invention.
  • reference numbers 1 to 3 denote higher- and lower-potential electrodes and an insulating barrier, respectively, similar to those shown in Figure 1.
  • Reference characters 6A and 6B each denote a unit spacer formed of an insulating solid material such as a fibrous material, a ceramic, a resin, etc.
  • the unit spacers each have a hollow shape, namely, a tubular shape with tetragonal cross section, comprising a hollow portion 7 and a peripheral portion 8 surrounding the hollow portion 7.
  • the hollow portion 7 is filled with an ambient insulating medium, for instance, a gas or an insulating oil (neither shown).
  • three unit spacers are disposed between the higher- and lower-potential electrodes 1 and 2 to maintain an insulation distance between the two electrodes and to clamp each insulating barrier 3 between the unit spacers 6A and 6B.
  • the width W1 of the unit spacer 6A is smaller than the width W2 of the unit spacer 6B, and the width of the hollow portion 7 of the unit spacer 6A is smaller accordingly.
  • the three unit spacers 6A and 6B are so disposed that side walls of the peripheral portions 8 thereof are stacked in zigzag and not aligned on a straight line, in the vertical direction in the figure.
  • the field concentration factor for this case is about 1.8.
  • the presence of the hollow portion 7 prevents the ratio d1/d2 from being reduced to a value approximate to 0, and, accordingly, the field concentration factor is moderated as compared with those in the prior art.
  • Figure 5 shows a sectional view of an insulating spacer according to another embodiment of this invention, illustrating the case of using three kinds of unit spacers 6A, 6B and 6C differing in width. In this case, a further reduction in the field concentration factor is achievable, as compares with the case shown in Figure 4.
  • Figure 6 shows a sectional view of an insulating spacer according to a further embodiment of this invention, illustrating the case of using one kind of unit spacers 6A. With the unit spacers 6A alternately staggered, horizontally in the figure, the same effect as in Figure 4 is produced.
  • the unit spacers are each made in a hollow form and are so stacked that the side walls of the peripheral portions of the unit spacers are not aligned on a plane.
  • the construction precludes the possibility that the space between two members such as electrodes may be filled, for the most part, with insulating solid material while a narrow gap may be present at the remaining minor part of the space. According to this invention, therefore, there is obtained the effect of preventing a local concentration of electric field.

Landscapes

  • Insulating Of Coils (AREA)
  • Insulating Bodies (AREA)
  • Installation Of Bus-Bars (AREA)
  • Gas-Insulated Switchgears (AREA)
EP19900110406 1989-06-21 1990-06-01 Insulating spacer Expired - Lifetime EP0403855B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP72582/89 1989-06-21
JP7258289U JPH0740263Y2 (ja) 1989-06-21 1989-06-21 絶縁スペーサ

Publications (2)

Publication Number Publication Date
EP0403855A1 EP0403855A1 (en) 1990-12-27
EP0403855B1 true EP0403855B1 (en) 1993-09-01

Family

ID=13493516

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900110406 Expired - Lifetime EP0403855B1 (en) 1989-06-21 1990-06-01 Insulating spacer

Country Status (4)

Country Link
EP (1) EP0403855B1 (ja)
JP (1) JPH0740263Y2 (ja)
DE (1) DE69003021T2 (ja)
HK (1) HK1003810A1 (ja)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1068970A (en) * 1964-11-19 1967-05-17 Central Electr Generat Board Improvements in or relating to electric cables with compressed gas insulation
DE1904389B2 (de) * 1969-01-30 1975-10-30 Formzeug Formen- Und Werkzeuggesellschaft Mbh, 5144 Wegberg Stützisolator aus Kunststoff
AT366854B (de) * 1979-05-18 1982-05-10 Bbc Brown Boveri & Cie Stromschienenanordnung fuer installationsteile

Also Published As

Publication number Publication date
JPH0312316U (ja) 1991-02-07
JPH0740263Y2 (ja) 1995-09-13
HK1003810A1 (en) 1998-11-06
DE69003021D1 (de) 1993-10-07
EP0403855A1 (en) 1990-12-27
DE69003021T2 (de) 1993-12-16

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