JPS5986209A - Insulation structure of end part - Google Patents

Insulation structure of end part

Info

Publication number
JPS5986209A
JPS5986209A JP57195914A JP19591482A JPS5986209A JP S5986209 A JPS5986209 A JP S5986209A JP 57195914 A JP57195914 A JP 57195914A JP 19591482 A JP19591482 A JP 19591482A JP S5986209 A JPS5986209 A JP S5986209A
Authority
JP
Japan
Prior art keywords
dielectric constant
wedge
paper
crepe
relative dielectric
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.)
Pending
Application number
JP57195914A
Other languages
Japanese (ja)
Inventor
Hiroshi Miyao
博 宮尾
Yoichi Kamo
加茂　洋一
Yuzuru Kamata
鎌田　譲
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP57195914A priority Critical patent/JPS5986209A/en
Publication of JPS5986209A publication Critical patent/JPS5986209A/en
Pending legal-status Critical Current

Links

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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)

Abstract

PURPOSE:To improve withstanding voltage of insulation of end part, by a methed wherein surface of a shield ring is covered by synthetic paper crepe with relative dielectric constant being specified value or less thereby electric field in wedge-like oil gap is reduced or the wedge-like oil gap is eliminated. CONSTITUTION:Surface of a shield ring 2 at end of a winding 1 of an oil immersed transformer is covered by synthetic crepe paper 6 having relative dielectric constant of 2.8 or less. For example, the cover 6 at the lower shield ring 2 of the winding 1 is formed by FEP (fluorinated ethylene propylene) laminated paper in crepe. Relative dielectric constant of the FEP laminated paper is about 2.6 at oil immersed state, but if the FEP laminated paper is formed in crepe the end of the shield ring 2 produces swelled part and space factor of the paper is reduced thereby relative dielectric constant of the cover 6 is further reduced to about 2.4. Residual wedge-like oil gap 7 becomes very small and relative dielectric constant of the cover 6 adjacent the oil gap 7 is reduced thereby field concentration to the wedge-like oil gap 7 is reduced to about 16-23%.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は変圧器の端部絶縁に係シ、特に、シールドリン
グの被覆材質に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to end insulation of a transformer, and more particularly to a covering material for a shield ring.

〔従来技術〕[Prior art]

従来の変圧器巻線端部絶縁構成を第１図に示す。 A conventional transformer winding end insulation configuration is shown in FIG.

巻線１の下部にシールドリンク２が配置され、端部絶縁
物３によシ支持されている。このシールドリンク２はセ
ルロース繊維よりなるクラフト紙の被扱４により覆われ
るうしかし、油浸クラフト紙の比誘電率は通常３．５前
後であり、まだこのシールドリングを支持する端部絶縁
物３であるプレスボードは３．５〜４．５の比誘電率を
もち、まわシの鉱油の比誘電率２．２〜２，３よ＃）１
．５〜２倍程度大きくなっている。そのため、シールド
リンク２と端部絶縁物の間に生じるクサビ状油隙５に電
界が集中し、耐電圧の向上に対する妨げとなる。A shield link 2 is arranged below the winding 1 and supported by an end insulator 3. This shield link 2 is covered with a kraft paper covering 4 made of cellulose fibers. However, the dielectric constant of oil-impregnated kraft paper is usually around 3.5, and the end insulator 3 that supports this shield ring is still covered. The pressboard has a dielectric constant of 3.5 to 4.5, and the dielectric constant of mineral oil is 2.2 to 2.3.
．． It is about 5 to 2 times larger. Therefore, the electric field is concentrated in the wedge-shaped oil gap 5 that is generated between the shield link 2 and the end insulator, which hinders the improvement of the withstand voltage.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、シールドリングの被覆絶縁物として、
クラフト紙よシも低い誘電率の合成紙のクレープ紙を採
用し、絶縁耐力の大きな端部絶縁構造を提供するにある
。The purpose of the present invention is to use the following as a covering insulator for a shield ring:
Crepe paper, a synthetic paper with a low dielectric constant, is used instead of kraft paper to provide an edge insulation structure with high dielectric strength.

〔発明の概要〕[Summary of the invention]

本発明は変圧器端部における絶縁破壊の起点が、シール
ドリングと端部絶縁物の間のクサビ状油隙であることを
実験により確認し、さらに、電界の集中がクサビ状油隙
にあることをつきとめ、この電界集中を緩和する手段と
して、シールドリングの被＋ｉを比誘電率′２．８以下
の低誘電率合成紙のクレープ紙により行なうにある。The present invention has confirmed through experiments that the starting point of dielectric breakdown at the end of a transformer is the wedge-shaped oil gap between the shield ring and the end insulator, and furthermore that the electric field is concentrated in the wedge-shaped oil gap. As a means to alleviate this electric field concentration, the material of the shield ring is made of crepe paper, which is a low dielectric constant synthetic paper having a relative dielectric constant of 2.8 or less.

〔発明の実施例〕[Embodiments of the invention]

本発明の一実施例を第２図に示す。巻線１の下部シール
ドリンク２の被覆６は、クレープ状のＦＥＰ　（フッ化
工レチンフ゛ロビレン）ラミネート紙より成っている。An embodiment of the present invention is shown in FIG. The covering 6 of the lower shield link 2 of the winding 1 is made of crepe-like FEP (fluorinated polypropylene) laminated paper.

ＦＥＰラミネート紙の比誘電率は油浸状態で２．６前後
であるが、クレープ状にすることにより、シールドリン
ク２の端部ではふくらみが生じ、紙の占積率が低下し、
被覆６の比誘を率はさらに２．４前後に低下する。また
、第１図の従来例で生じていたクサビ状油隙５はクレー
プ状の紙によって埋められ、極めて小さなりサビ状油隙
７となる。このように、クサビ状油隙５の近傍の被覆６
の比誘電率が下がった結果、残存するクサビ状油隙７に
対する電界の集中は、約１６〜２３％低減される。The relative permittivity of FEP laminated paper is around 2.6 when immersed in oil, but by forming it into a crepe shape, a bulge occurs at the end of the shield link 2, reducing the space factor of the paper.
The dielectric constant of the coating 6 further decreases to around 2.4. Furthermore, the wedge-shaped oil gap 5 that occurred in the conventional example shown in FIG. 1 is filled with crepe-like paper, resulting in an extremely small wedge-shaped oil gap 7. In this way, the coating 6 near the wedge-shaped oil gap 5
As a result of the lowering of the dielectric constant of , the concentration of electric field on the remaining wedge-shaped oil gap 7 is reduced by about 16 to 23%.

第３図は本発明の他の実施例を示すもので、第２図と異
なるのは、シールドリンク２の被覆８のクレープ状合成
紙１”　Ｅ　Ｐの厚さを増して、端部でのふくらみを大
きくシ、クサビ状油ｉｔ生じないようにしている。この
結果、クサビ状油隙での電界集中は無くなり、又、被覆
８の表面の電界も低減される。この実施例によれば、さ
らにクサビ状油隙を無くす効果がある。Fig. 3 shows another embodiment of the present invention, which differs from Fig. 2 in that the thickness of the crepe-like synthetic paper 1''EP of the covering 8 of the shield link 2 is increased, and the end portions are made thicker. The bulge is made large to prevent the formation of wedge-shaped oil.As a result, electric field concentration at the wedge-shaped oil gap is eliminated, and the electric field on the surface of the coating 8 is also reduced.According to this embodiment, Furthermore, it has the effect of eliminating wedge-shaped oil gaps.

この他クレープ状合成紙としてＦＥＰの他にポリエステ
ル不織布のクレープ状にしたものを被覆として用いるこ
ともでき、同様な効果が生ずる。In addition to FEP, a crepe-like synthetic paper made of polyester nonwoven fabric can also be used as a coating, and the same effect will be produced.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、クサビ状油隙の電界を低減したり、ク
サビ状油隙を無くすことができるので、端部絶縁の耐電
圧が向上する。According to the present invention, the electric field in the wedge-shaped oil gap can be reduced or the wedge-shaped oil gap can be eliminated, so that the withstand voltage of the end insulation is improved.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の断面図、第２図は本発明の一実施例の断
面図、第３図は本発明の他の実施例の断面図である。FIG. 1 is a sectional view of a conventional device, FIG. 2 is a sectional view of one embodiment of the present invention, and FIG. 3 is a sectional view of another embodiment of the present invention.

Claims (1)

【特許請求の範囲】[Claims] １、巻線の端部にシールドリングをもつ油入変圧器の端
部絶縁構成において、前記シールドリングの表面全比誘
電率２．８以下のクレープ状合成紙により被覆したこと
を特徴とする端部絶縁構造。1. An end insulation configuration of an oil-immersed transformer having a shield ring at the end of the winding, characterized in that the surface of the shield ring is covered with crepe-like synthetic paper having a total dielectric constant of 2.8 or less. Part insulation structure.
JP57195914A 1982-11-10 1982-11-10 Insulation structure of end part Pending JPS5986209A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57195914A JPS5986209A (en) 1982-11-10 1982-11-10 Insulation structure of end part

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57195914A JPS5986209A (en) 1982-11-10 1982-11-10 Insulation structure of end part

Publications (1)

Publication Number Publication Date
JPS5986209A true JPS5986209A (en) 1984-05-18

Family

ID=16349083

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57195914A Pending JPS5986209A (en) 1982-11-10 1982-11-10 Insulation structure of end part

Country Status (1)

Country Link
JP (1) JPS5986209A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02148810A (en) * 1988-11-30 1990-06-07 Toshiba Corp High voltage section supporting device for gas insulated electric equipment
CN102568784A (en) * 2012-03-02 2012-07-11 海南威特电气集团有限公司 Energy-saving transformer with compact structure

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49113125A (en) * 1973-03-05 1974-10-29

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49113125A (en) * 1973-03-05 1974-10-29

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02148810A (en) * 1988-11-30 1990-06-07 Toshiba Corp High voltage section supporting device for gas insulated electric equipment
CN102568784A (en) * 2012-03-02 2012-07-11 海南威特电气集团有限公司 Energy-saving transformer with compact structure

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