EP0014967B1 - Enveloppe de traversée - Google Patents

Enveloppe de traversée Download PDF

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Publication number
EP0014967B1
EP0014967B1 EP19800100757 EP80100757A EP0014967B1 EP 0014967 B1 EP0014967 B1 EP 0014967B1 EP 19800100757 EP19800100757 EP 19800100757 EP 80100757 A EP80100757 A EP 80100757A EP 0014967 B1 EP0014967 B1 EP 0014967B1
Authority
EP
European Patent Office
Prior art keywords
bushing
mounting flange
spring mechanism
porcelain
springs
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
Application number
EP19800100757
Other languages
German (de)
English (en)
Other versions
EP0014967A1 (fr
Inventor
Mitsuhiro Kishida
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
Priority claimed from JP1770879A external-priority patent/JPS55109317A/ja
Priority claimed from JP54082868A external-priority patent/JPS601723B2/ja
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP0014967A1 publication Critical patent/EP0014967A1/fr
Application granted granted Critical
Publication of EP0014967B1 publication Critical patent/EP0014967B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
    • 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
    • H01B17/14—Supporting insulators
    • H01B17/16—Fastening of insulators to support, to conductor, or to adjoining insulator
    • 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
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • H01B17/265—Fastening of insulators to support

Definitions

  • the present invention relates to a bushing according to the first part of claim 1 and more particularly but not exclusively to a bushing to be used at the outlet of e.g. a super high voltage transformer in the more than 500 KV class, or a tank type electric machinery and apparatus wherein switchgears are immersed in insulating fluid such as insulating gas, insulating oil, etc.
  • FR-A-10 40 087 discloses a bushing having a porcelain portion with one end thereof being spaced from a cylindrical mounting flange, a connecting portion with a predetermined gap being left between it and said mounting flange, a sealing means and a spring mechanism means to elastically connect said connecting portion and said mounting flange.
  • the porcelain portion is axially spaced from said cylindrical mounting flange; and the connecting portion is fixedly secured to the porcelain portion.
  • the frequency of an earthquake lies principally in the range of 1 to 10 Hz
  • bushing of the plus 220 KV class may have a natural frequency, in its mounted state in electric machinery or apparatus, of 10 Hz, this frequency coinciding with that of an earthquake.
  • the natural frequency of the bushing is low, so that it may coincide with the earthquake frequency, and so that there is a risk of breakage of the porcelain during a strong earthquake.
  • the adhesion of the contamination substance differs between the bushing portions and the stay insulator portions, and generally the stay insulator portions each having a smaller drum diameter are easily contaminated. At any rate, it is necessary to assure an electric voltage value resisting against contamination when connected in parallel. Therefore, from this point of view such a system likewise decreases in reliability.
  • a core electrode 1 is surrounded circularly by a condenser part 2 which comprises a cylindrically wound insulating paper with an electrical field regulation electrode introduced therein so as to equalize the inner and the outer electrical fields, core electrode 1 supporting a lower porcelain portion 3 at the lowest portion by means of a screwable support member 4 which acts also as a terminal.
  • Lower porcelain portion 3 is placed onto support member 4 with a gasket being interposed therebetween, while a flange 5 for fixedly mounting the bushing to an electric machinery or apparatus is set upon the porcelain portion 3.
  • An upper porcelain portion 7 with porcelain fixing elements 6a, 6b cemented thereto at its upper and lower portions is placed on flange 5 with a gasket interposed therebetween, to be fixedly secured by a bolt and nut assembly.
  • a stop member 8 which receives a coil spring 9 to compress porcelain portions 3, 7 and flange 5, a spring compressor plate 10, and a ring nut 11 to adjust the compressive force of coil spring 9.
  • flexible lead wires 13 are provided for the connection of a terminal member 12 and central conductor 1, insulating oil 14 being filled in the space formed between central conductor 1 and upper as well as lower porcelain portions 3, 7.
  • a gas space having an appropriate volume is left within top member 8 so as to avoid an abnormal change in the volume of insulating oil 14, and inert gas, such as nitrogen, is filled within the space under a suitable pressure.
  • inert gas such as nitrogen
  • the earthquake vibration response of a bushing having such a configuration when mounted on an electric machinery or apparatus may be amplified by more than two times at the portion of the mounting flange of the bushing, even if the electric machinery or apparatus as a whole has been designed with a view to earthquake resistance. Further, it is conceivable that an amplification with a factor of three or more may occur at the top of the bushing. Therefore, the bushing must be able to resist such amplified vibration, but when the bushing vibrates, mechanical stresses are added to the various parts of the bushing. Although the magnitudes of the stresses differ from part to part, the bending stress at the upper surface part of the lower fixing member 6a of upper porcelain portion 7 shown in Fig. 1, i.e. at the inner side of the part indicated by an arrow, is maximum. The bending breakage strength of porcelain is in the order of 200 to 250 kg/cm 2 , so that when the bending stress exceeds this value, the porcelain portion may be broken.
  • a bushing in which the dimensions of the porcelain portions are not too large has a high natural frequency, seldom developing the resonance phenomenon, and has sufficient earthquake strength due to the large drum diameter of the porcelain portion relative to the bushing weight.
  • an elongated porcelain portion is used because of the necessity to lengthen the surface leakage distance, and while the weight becomes higher, the drum diameter is not so large. Therefore, its natural frequency is low, easily coinciding with the earthquake frequency to cause resonance and, hence, large oscillation. It may be assumed that in such an event the internal stress in the porcelain portion would easily exceed the breakage stress.
  • the invention as claimed is intended to provide a remedy by proposing a bushing of superior vibration proof characteristics.
  • the bushing according to the first part of claim 1 is characterized in that said connecting element is rigidly secured to said porcelain portion at said one end, that said sealing means is provided to seal the gap formed between said mounting flange and said connecting element, that damping means is interposed between said connecting element and said mounting flange and that said spring mechanism means comprises a plurality of springs, the damping means and springs serving to absorb energy tending to cause the porcelain portion to vibrate.
  • the damper mechanism incorporates a so-called dash-pot construction to provide a more effective absorption of the vibration energy, so that breakage of the bushing due to vibration is more effectively prevented.
  • the advantages offered by the invention reside mainly in the fact that, since in a bushing the adapter and the mounting flange are connected by the spring mechanism, the oscillation energy applied to the mounting portion of the bushing under earthquake conditions can be absorbed by the spring mechanism so that the earthquake proof characteristic of the bushing is remarkably improved.
  • a spring mechanism is disposed between a porcelain portion and a mounting flange in a bushing, thereby to absorb the vibration energy by friction when the spring mechanism is compressed, so that when a large vibration is applied to the mounting portion of the bushing as the result of a large earthquake, the vibration energy is absorbed by the spring mechanism thereby protecting the bushing against breakage.
  • reference numerals 1,2,3, 6a and 7 show parts similar to those shown in Fig. 1, with 15 being a cylindrical adapter connected to one end of porcelain portion 7 through a rigid member 6a, and having a connecting portion 15a extending orthogonally to the axis.
  • 16 is a cylindrical mounting flange receiving therein adapter 15 and having a mounting portion 16a extending orthogonally to the axis and adapted to be connected to flange 5, as well as a connecting portion 16b opposing the connecting portion 15a.
  • a plurality of bolts 17 pass through said confronting connecting portions 15a and 1 6b, and a spring mechanism 18 is held by each of bolts 17 and nuts 19 screwed thereon so as to maintain a predetermined fastening force, with spring mechanism 18 being constituted by a number of belleville springs piled up so as to absorb vibration energies by friction when compressed.
  • a sealing element 20 comprising an 0- ring is disposed between adapter 15 and mounting flange 16 so that adapter 15 and mounting flange 16 sealingly separate the inside of porcelain portion 7 from the outside.
  • a damping element 21 is interposed between connecting portions of 15a and 16b of adapter 15 and mounting flange 16.
  • the response of the bushing to the acceleration does not become excessive from the time of the beginning of the compression of spring mechanism 18, and the internal stress of porcelain 7 is also prevented from becoming too large, thereby to keep it below its breakage stress. Therefore, in comparison with a case where porcelain portion 7 is rigidly secured to mounting flange 16, the bushing is prevented from breakage even in the case of a heavy earthquake.
  • spring mechanism 18 is arranged outside mounting flange 16, a similar effect can be expected if spring mechanism 18 is provided inside mounting flange 16 as shown in Fig. 4, wherein 25 is a connecting plate.
  • Fig. 5 shows another embodiment of the present invention wherein reference numerals 1, 2, 3, 6a and 7 correspond to those shown in the previous figures, 16 being a mounting flange ridigly secured to lower porcelain portion 3, 25 being a connecting plate secured to the upper surface of the mounting flange 16 by bolts and nuts 26, 15 being an adapter secured to a fastening element 6a by bolts, and 27 being connecting rods arranged in adapter 15 at regular intervals to transfer a dimensional change caused between adapter 15 and connecting plate 25 when porcelain portion 7, fastening element 6a and adapter 15 oscillate integrally.
  • each damper comprising a cylindrical pot 29 encircling connecting rods 27 and a piston 30 spaced by a predetermined gap from pot 29.
  • 31 is a coil spring disposed around connecting plate 25, and a nut 32 is screwed to connecting rod 27, said nut 32 being adapted to secure piston 30 as well as to provide a predetermined fastening or clamping force between connecting plate 25 and adapter 19.
  • 33 is a damping member interposed between connecting plate 25 and adapter 15 to relieve the collision phenomena caused by the occurrence of an opening between them as a result of the oscillation.
  • 34 is a sealing element comprising a bellow to prevent insulating fluid filled within the porcelain portion from leaking out if an opening is formed between connecting plate 25 and adapter 15.
  • sealing member 34 against the opening phenomenon at the time of vibration
  • sealing effect can be maintained also by an 0-ring 35, as shown in Fig. 6.
  • a number of springs 31 can be arranged peripherally at equispaced intervals as shown in Fig. 7, and a cylindrical ring 36 can be disposed inside a circle encircling the radially inner surfaces of springs 31 so as to be coaxial with the center of the bushing, so that double cylinders are constituted together with the drum portion 16a of mounting flange 16, whereby an annular piston 30 is disposed within double cylinders 16a, 36 with suitable gaps being left between their confronting surfaces, and springs 31 being suitably compressed by nuts screwed on connecting rods 27.
  • a dash pot effect is realized by the double cylinders and the piston, damping the vibration energy even more efficiently.
  • the vibration energy is absorbed by the damper mechanism such that the damping is increased, and the magnification of the acceleration response is decreased so that the internal stress within the porcelain portion can be suppressed below its breakage stress even if the bushing is subjected to severe earthquake.
  • the bushing is constituted such that the adapter and the fastening flange are fastened by a plurality of springs with a dash pot construction being provided around the springs, when the bushing is subjected to severe earthquake and vibrates with a large amplitude, the vibration energy is absorbed by the dash pot construction simultaneously with the occurrence of an opening between the adapter and the mounting flange. Therefore, it is made possible to suppress the internal stress of the porcelain portion below its breakage stress.

Claims (7)

1. Douille comprenant une partie en porcelaine (7) dont une extrémité se trouve à une distance axiale par rapport à une bride de montage cylindrique (16), un conducteur intérieur (1) traversant ladite partie en porcelaine (7) et ladite bride de montage (16), un fluide isolant scellé dans ladite bride de montage (16) et ladite partie en porcelaine (7), un élément de connexion (15) fixé de manière rigide à ladite extrémité de ladite partie en porcelaine et adapté pour pouvoir être traversé par ledit conducteur intérieur (1) laissant une fente prédéterminée entre ledit élément de connexion (15) et ladite bride de montage (16), un dispositif d'étanchéité (20; 23; 34; 35) et un mécanisme à ressort (18; 31) en vue de réaliser une connexion élastique entre ledit élément de connexion (15) et ladite bride de montage (16), charactérisée en ce que ledit. dispositif d'étanchéité (20) sert à boucher la fente formée entre ladite bride de montage (16) et ledit élément de connexion (15) de manière à ce qu'un dispositif d'amortissement (21; 28; 16a; 30; 36) est intercalé entre ledit élément de connexion (15) et ladite bride de montage (16) et à ce que le mécanisme à ressort (18; 31) comprend plusieurs ressorts, le dispositif d'amortissement (21; 28; 16a, 30, 36) et les ressorts servant à absorber l'énergie qui tend à mettre en vibration la partie en porcelaine.
2. Douille selon revendication 1 caractérisée en ce que ledit dispositif d'étanchéité (20) comprend un anneau torique.
3. Douille selon revendication 1 caractérisée en ce que ledit dispositif d'étanchéité comprend un soufflet (23; 34).
4. Douille selon revendication 1, caractérisée en ce que ledit mécanisme à ressort (18; 31) est disposé à l'extérieur de ladite bride de montage (16).
5. Douille selon revendication 1, caractérisée en ce que ledit mécanisme à ressort (18; 31) est disposé à l'intérieur de ladite bride de montage (16).
6. Douille selon revendication 1 caractérisée en ce que ledit mécanisme à ressort (31 ) est entouré par un pot cylindrique (29) et en ce qu'un piston (30) est solidement fixé à l'extrémité dudit mécanisme à ressort (31) ou une fente prédéterminée est laissée entre ledit pot (29) et la circonférence dudit piston (30) de manière à ce que ledit pot (29) et ledit piston (30) forment un amortisseur.
7. Douille selon chacune des revendications 1 à 6, caractérisée en ce que lesdits ressorts sont du type Belleville (18).
EP19800100757 1979-02-16 1980-02-14 Enveloppe de traversée Expired EP0014967B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP17708/79 1979-02-16
JP1770879A JPS55109317A (en) 1979-02-16 1979-02-16 Bushing
JP54082868A JPS601723B2 (ja) 1979-06-28 1979-06-28 ブツシング
JP82868/79 1979-06-28

Publications (2)

Publication Number Publication Date
EP0014967A1 EP0014967A1 (fr) 1980-09-03
EP0014967B1 true EP0014967B1 (fr) 1983-12-14

Family

ID=26354268

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800100757 Expired EP0014967B1 (fr) 1979-02-16 1980-02-14 Enveloppe de traversée

Country Status (2)

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EP (1) EP0014967B1 (fr)
DE (1) DE3065859D1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104597132A (zh) * 2014-11-07 2015-05-06 国家电网公司 一种基于共振声学的瓷支柱绝缘子带电检测方法
CN106229927B (zh) * 2016-10-08 2018-03-02 中国地震局工程力学研究所 一种用于瓷柱型电气设备减震的混合控制装置
CN110504092B (zh) * 2019-09-10 2022-03-08 日立能源瑞士股份公司 套管及其制造方法
CN111799045B (zh) * 2020-07-20 2021-11-30 江西省萍乡电瓷电器厂 一种减震绝缘子

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1040087A (fr) * 1950-07-31 1953-10-13 Agalux Dispositif destiné à assurer automatiquement l'étanchéité à l'huile des transformateurs électriques
US2809358A (en) * 1954-08-31 1957-10-08 Westinghouse Electric Corp Terminal concentric bushing with current transformer
DE949180C (de) * 1954-09-16 1956-09-13 Voigt & Haeffner Ag Anordnung fuer die nachgiebige Befestigung von Stuetz- bzw. Abspannisolatoren
GB841722A (en) * 1957-12-09 1960-07-20 English Electric Co Ltd Improvements in or relating to electrical bushing assemblies
CH409040A (de) * 1962-07-10 1966-03-15 Bbc Brown Boveri & Cie Elektrische Durchführung

Also Published As

Publication number Publication date
EP0014967A1 (fr) 1980-09-03
DE3065859D1 (en) 1984-01-19

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