JPH11144979A - Insulating structure of coil - Google Patents
Insulating structure of coilInfo
- Publication number
- JPH11144979A JPH11144979A JP9310300A JP31030097A JPH11144979A JP H11144979 A JPH11144979 A JP H11144979A JP 9310300 A JP9310300 A JP 9310300A JP 31030097 A JP31030097 A JP 31030097A JP H11144979 A JPH11144979 A JP H11144979A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- insulator
- insulating
- wrapped
- insulating sheet
- 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.)
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- Insulating Of Coils (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、乾式変圧器、リア
クトル等に適用されるコイルの絶縁構造に関し、特に、
コイルと鉄心等の外部金属間の耐インパルス電圧性能を
高めたコイルの絶縁構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil insulation structure applied to a dry transformer, a reactor, etc.
The present invention relates to a coil insulation structure with improved impulse voltage resistance between a coil and an external metal such as an iron core.
【０００２】[0002]
【従来の技術】例えば、電気機器用の変圧器において、
低圧級の乾式変圧器であっても、高いインパルス電圧に
耐える性能が要求される場合がある。このような場合、
従来では、一般に、高圧コイル（一次コイル）と他の金
属部分の間の絶縁距離を大きくしたり、或はコイルの周
囲に配設する絶縁物の厚さや幅を大きくすることによ
り、絶縁耐力を高くしている。2. Description of the Related Art For example, in a transformer for electric equipment,
Even a low-voltage dry-type transformer may be required to have a capability to withstand a high impulse voltage. In such a case,
Conventionally, in general, the insulation strength is increased by increasing the insulation distance between a high-voltage coil (primary coil) and another metal part, or by increasing the thickness and width of an insulator disposed around the coil. High.
【０００３】すなわち、従来の変圧器では、図５の部分
断面図に示すように、高圧コイル（一次コイル）である
コイル２０の端部側に、絶縁紙を巻き付けて端部絶縁物
２１を配設し、その絶縁物の幅Ｗ１を例えば約３０mmと
広くして沿面距離を長くすると共に、コイル２０の外周
に巻装される外周絶縁物２２の厚さを厚くし、更に、鉄
心２３と端部絶縁物２１との間の空間距離Ｗ２を大きく
とり、絶縁耐力を高くするようにしていた。That is, in a conventional transformer, as shown in a partial cross-sectional view of FIG. 5, an insulating paper is wound around an end of a coil 20 which is a high-voltage coil (primary coil), and an end insulator 21 is provided. The width W1 of the insulator is increased to, for example, about 30 mm to increase the creepage distance, and the thickness of the outer insulator 22 wound around the outer periphery of the coil 20 is increased. The space distance W2 between the insulator 21 is made large to increase the dielectric strength.
【０００４】[0004]
【発明が解決しようとする課題】このため、例えば、３
０ｋＶの絶縁耐力を持つ変圧器の場合、端部絶縁物とそ
の上の空間距離を加えた絶縁距離が約５０mmと大きくな
り、変圧器の形状が非常に大型化する問題があった。Therefore, for example, 3
In the case of a transformer having a dielectric strength of 0 kV, the insulation distance including the end insulator and the space above it becomes large, about 50 mm, and there is a problem that the shape of the transformer becomes very large.
【０００５】そこで、従来では、コイル全体をエポキシ
樹脂等でモールドすることにより、コイルと鉄心等の金
属間の絶縁耐力を高めることも行われているが、コイル
の周囲に樹脂をモールドするためには、樹脂モールド用
の大掛かりな設備が必要となり、また、製造時には樹脂
モールドのための多くの作業工数が必要となり、製造コ
ストの増大を招く問題があった。Therefore, conventionally, the dielectric strength between a coil and a metal such as an iron core has been increased by molding the entire coil with an epoxy resin or the like. However, there is a problem that a large-scale facility for resin molding is required, and a large number of man-hours are required for resin molding at the time of manufacturing, which causes an increase in manufacturing cost.
【０００６】本発明は、上記の点に鑑みてなされたもの
で、コイル端部と鉄心間の絶縁距離を最小にしながらそ
の間の絶縁耐力を向上させ、小型化を実現できると共
に、低コストで製造することができるコイルの絶縁構造
を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is possible to improve the dielectric strength therebetween while minimizing the insulation distance between the coil end and the iron core, thereby realizing miniaturization and manufacturing at low cost. It is an object of the present invention to provide a coil insulation structure that can be used.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明のコイルの絶縁構造は、鉄心の外周に巻装さ
れてなるコイルの絶縁構造において、ゴム状弾性体から
なる包み込み絶縁シートがコイルのほぼ全体を包むよう
に配設され、包み込み絶縁シートの周囲に外周絶縁物が
巻き付けて配設されていることを特徴とする。In order to achieve the above object, a coil insulation structure according to the present invention is a coil insulation structure wound around an outer periphery of an iron core, wherein the coil insulation structure comprises a rubber-like elastic body. Are provided so as to wrap almost the entire coil, and the outer insulating material is wound around the wrapped insulating sheet.
【０００８】ここで、包み込み絶縁シートにより包囲さ
れるコイルの端部に、端部絶縁物をコイルの各巻き層に
対応して巻装し、包み込み絶縁シートの外側端部には、
外側端部絶縁物を配設すると効果的である。ゴム状弾性
体としては、絶縁性能に優れたシリコンゴムを例示する
ことができる。また、プリプレグシートを使用すること
もできる。Here, an end insulator is wound around the end of the coil surrounded by the wrapped insulating sheet in correspondence with each winding layer of the coil, and the outer end of the wrapped insulating sheet is
It is effective to provide an outer end insulator. Examples of the rubber-like elastic body include silicon rubber having excellent insulation performance. Also, a prepreg sheet can be used.
【０００９】[0009]
【発明の作用・効果】このような絶縁構造のコイルは、
ゴム状弾性体或はプリプレグシートからなる絶縁性能の
高い包み込み絶縁シートにより、コイルが包み込まれて
いるため、コイル端部と鉄心等の金属間の絶縁耐力を高
くすることができる。従って、コイル・鉄心間の絶縁距
離を長くしなくても、充分大きな絶縁耐力を持たせるこ
とができ、コイル・鉄心間の絶縁距離を短くして、それ
を使用する変圧器やリアクトル等を小型化することがで
きる。The operation and effect of the present invention are as follows.
Since the coil is wrapped by the wrapped insulating sheet having a high insulating performance made of a rubber-like elastic body or a prepreg sheet, the dielectric strength between the coil end and a metal such as an iron core can be increased. Therefore, it is possible to provide a sufficiently large dielectric strength without increasing the insulation distance between the coil and iron core, shorten the insulation distance between the coil and iron core, and reduce the size of transformers and reactors that use it. Can be
【００１０】また、ゴム状弾性体或はプリプレグシート
からなる絶縁シートは、同じ厚さの厚紙等の紙類に比
べ、非常に柔軟性があって曲げ易く、伸縮性もあるた
め、厚紙でコイルを包み込む場合のように、紙にスリッ
トを入れたり、特殊な形状に裁断したりする必要がな
く、容易に絶縁シートをその外形に沿って包み込むこと
ができる。An insulating sheet made of a rubber-like elastic body or a prepreg sheet is very flexible and easy to bend and has elasticity as compared with paper such as cardboard having the same thickness. It is not necessary to make a slit in the paper or cut the paper into a special shape as in the case of wrapping, and the insulating sheet can be easily wrapped along the outer shape.
【００１１】さらに、包み込み絶縁シートの外周部に
は、絶縁紙を巻き付けてなる外周絶縁物が配設されるた
め、製造工程時等に包み込み絶縁シートが傷つく虞はな
く、また、最終工程で、ワニス或はレジンを常圧で外周
絶縁物に含浸処理することができるため、コイル外側の
機械的強度を充分に高くすることができる。このため、
コイルを使用する変圧器やリアクトル等におけるコイル
押さえの構造を簡単化することができる。Further, since the outer insulating material formed by winding the insulating paper is provided on the outer peripheral portion of the wrapped insulating sheet, there is no possibility that the wrapped insulating sheet may be damaged during a manufacturing process or the like. Since the varnish or resin can be impregnated into the outer peripheral insulator at normal pressure, the mechanical strength outside the coil can be sufficiently increased. For this reason,
It is possible to simplify the structure of a coil presser in a transformer or a reactor using a coil.
【００１２】[0012]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。図１は本発明を適用した乾式変圧
器の半断面図を示している。この変圧器のコイル組付体
は、基本的には、鉄心１の脚部に外嵌されるコイルボビ
ン２上に、先ず二次コイル（低圧コイル）３が巻装さ
れ、その外周に内側絶縁物５が巻装され、その外周に一
次コイル（高圧コイル）４が巻装されると共に包み込み
絶縁シート８により包み込まれ、、その外側に外周絶縁
物６が巻装されて構成される。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a half sectional view of a dry transformer to which the present invention is applied. Basically, a coil assembly of this transformer has a secondary coil (low-voltage coil) 3 wound on a coil bobbin 2 fitted externally to a leg of an iron core 1, and an inner insulator on the outer periphery thereof. 5 is wound, a primary coil (high-voltage coil) 4 is wound around the outer periphery thereof, wrapped by a wrapping insulating sheet 8, and an outer peripheral insulator 6 is wound around the outside.
【００１３】ボビンに巻装される二次コイル３は、その
巻装時、その上部と下部に厚紙テープ状の絶縁紙からな
る端部絶縁物７を同時に巻装する。そして、その端部絶
縁物７と二次コイル３の外周に、絶縁紙を巻装して内側
絶縁物５が包囲するように配設される。At the time of winding, the secondary coil 3 wound around the bobbin is simultaneously wound with an end insulator 7 made of cardboard-shaped insulating paper on the upper and lower portions. An insulating paper is wound around the end insulator 7 and the outer periphery of the secondary coil 3 so as to surround the inner insulator 5.
【００１４】本発明の絶縁構造を有する一次コイル４
は、その内側絶縁物５の外周に、端部絶縁物９と共に包
み込み絶縁シート８に包まれて配設され、その上下に外
側端部絶縁物１０が配設される。包み込み絶縁シート８
としては、薄いシリコンゴムシート（例えば、厚さ約
０．３mmのシート）が好適であるが、他のゴム状弾性
体、或はプリプレグシート（ガラス繊維に熱硬化性樹脂
を含浸させた半硬化状態のシート）を使用することもで
きる。Primary coil 4 having insulating structure of the present invention
Are wrapped around the outer periphery of the inner insulator 5 together with the end insulator 9 and wrapped in the insulating sheet 8, and outer end insulators 10 are arranged above and below the inner insulator 5. Wrapping insulation sheet 8
As the material, a thin silicon rubber sheet (for example, a sheet having a thickness of about 0.3 mm) is preferable, but another rubber-like elastic material or a prepreg sheet (a semi-cured material obtained by impregnating glass fiber with a thermosetting resin) is preferable. State sheet) can also be used.
【００１５】すなわち、図３（ａ）（ｂ）に示す如く、
先ず、巻装された内側絶縁物５の外側に、包み込み絶縁
シート８をその周囲に巻きつけるように包む。この包み
込み絶縁シート８は、高さが内側絶縁物５の約２倍、幅
が内側絶縁物５の外周長さにほぼ等しく又はそれ以上の
矩形形状に形成され、その略中央部で内側絶縁物５を包
み、その上部と下部を突出させた状態とする。なお、包
み込み絶縁シート８は複数に分割することもできる。That is, as shown in FIGS. 3A and 3B,
First, the wrapped insulating sheet 8 is wrapped around the wound inner insulator 5 so as to be wound therearound. The wrapped insulating sheet 8 is formed in a rectangular shape having a height approximately twice as large as the inner insulator 5 and a width substantially equal to or greater than the outer peripheral length of the inner insulator 5, and a substantially central portion of the inner insulator 5. 5 is wrapped and its upper and lower parts are made to protrude. The wrapping insulating sheet 8 can be divided into a plurality.
【００１６】次に、図１及び図４（ｃ）に示すように、
内側絶縁物５と包み込み絶縁シート８の外周に、一次コ
イル４と端部絶縁物９を巻装する。端部絶縁物９は、コ
イル４の外径とほぼ同じ厚さを持つ厚紙テープ状の絶縁
紙を用いて形成され、一次コイル４と共にその上部と下
部に隣接して巻装され、コイル４の各層と同じ層状にま
た同じ厚さに巻装される。なお、このとき、一次コイル
４は上下の端部絶縁物９と共に内側絶縁物５の中間部に
配置され、内側絶縁物５の上端部と下端部が、端部絶縁
物９の上下に所定の幅（外側端部絶縁物１０の巻き幅）
だけ、突出するように巻装される。Next, as shown in FIG. 1 and FIG.
The primary coil 4 and the end insulator 9 are wound around the outer periphery of the inner insulator 5 and the wrapping insulating sheet 8. The end insulator 9 is formed using a cardboard tape-like insulating paper having a thickness substantially equal to the outer diameter of the coil 4, and is wound together with the primary coil 4 adjacent to the upper and lower portions thereof. Each layer is wound in the same layer and the same thickness. At this time, the primary coil 4 is arranged in the middle of the inner insulator 5 together with the upper and lower end insulators 9, and the upper end and the lower end of the inner insulator 5 are positioned above and below the end insulator 9 by predetermined distances. Width (winding width of outer end insulator 10)
Only, it is wound so as to protrude.
【００１７】次に、図１及び図４（ｃ）から（ｄ）に示
す如く、包み込み絶縁シート８の上部と下部に突出した
部分を、外側に折り返し、一次コイル４と上下の端部絶
縁物９を包み込むようにする。つまり、包み込み絶縁シ
ート８の上部に突出した部分を下側に折り返し、包み込
み絶縁シート８の下部に突出した部分を上部に折り返す
ことにより、一次コイル４とその上下の端部絶縁物９を
絶縁シート８で包み込む。Next, as shown in FIG. 1 and FIGS. 4 (c) to 4 (d), the upper and lower portions of the wrapped insulating sheet 8 are turned outward to turn the primary coil 4 and the upper and lower end insulators. 9 is wrapped around. In other words, the primary coil 4 and the upper and lower end insulators 9 are separated from the primary coil 4 and the upper and lower end insulators 9 by folding back the upper part of the wrapped insulating sheet 8 downward and returning the lower part of the wrapped insulating sheet 8 upward. Wrap with 8.
【００１８】このとき、シリコンゴム製の絶縁シート８
は、同程度の厚さの紙類に比べ、非常に柔軟性があって
曲げ易く、伸縮性もあるため、厚紙でコイルを包み込む
場合のように、紙にスリットを入れたり、特殊な形状に
裁断したりする必要がなく、容易に絶縁シート８を一次
コイル４等の外形に沿って包み込むことができる。At this time, an insulating sheet 8 made of silicon rubber is used.
Is very flexible, easy to bend, and stretchable compared to paper of similar thickness, so you can cut the paper into a special shape, such as wrapping a coil in thick paper. The insulating sheet 8 can be easily wrapped around the outer shape of the primary coil 4 or the like without cutting.
【００１９】次に、上部と下部に突出した内側絶縁物５
の部分、つまり包み込み絶縁シート８で包み込んだ一次
コイル４と上下の端部絶縁物９の上側と下側に、外側端
部絶縁物１０を巻装する。この外側端部絶縁物１０は、
上記端部絶縁物９と同様に、厚紙テープ状の絶縁紙を使
用し、その幅は内側絶縁物５の突出部分の幅とし、これ
によって、一次側と二次側の絶縁物を含めた巻き幅は、
同じ幅に合わせられる。Next, an inner insulator 5 protruding upward and downward.
, That is, the outer end insulator 10 is wound around the primary coil 4 wrapped by the wrapping insulating sheet 8 and the upper and lower end insulators 9. This outer end insulator 10 is
As in the case of the above-mentioned end insulator 9, a thick paper tape-shaped insulating paper is used, and the width thereof is the width of the protruding portion of the inner insulator 5, whereby the winding including the primary and secondary insulators is performed. The width is
Can be adjusted to the same width.
【００２０】そして、その外周に、つまり、包み込み絶
縁シート８で包み込んだ一次コイル４、その上下の端部
絶縁物９、及びその上下の外側端部絶縁物１０の外周
に、上記内側絶縁物５と同じ幅の絶縁紙を用いて外周絶
縁物６が巻装される。On the outer periphery of the primary coil 4, the upper and lower end insulators 9 wrapped by the wrapping insulating sheet 8, and the outer periphery of the upper and lower outer end insulators 10, the inner insulator 5 The outer peripheral insulator 6 is wound using an insulating paper having the same width as that of.
【００２１】上記のように、一次コイル４、二次コイル
３、及び絶縁物を巻装したコイル組付体は、最終工程
で、ワニス或はレジンを常圧で外周絶縁物６や外側端部
絶縁物１０に含浸処理し、それらを硬化させる。これに
より、コイル端部の機械的強度を充分に高くすることが
でき、変圧器におけるコイル押さえの構造を簡単化する
ことができる。As described above, the primary coil 4, the secondary coil 3, and the coil assembly on which the insulating material is wound are formed by applying a varnish or resin to the outer insulating material 6 or the outer end portion at normal pressure in the final step. The insulator 10 is impregnated and cured. Accordingly, the mechanical strength of the coil end can be sufficiently increased, and the structure of the coil holder in the transformer can be simplified.
【００２２】このように、一次コイル４が端部絶縁物９
と共に、シリコンゴムシートからなる絶縁性能の高い包
み込み絶縁シート８により、包み込まれているため、コ
イル端部と鉄心１間の絶縁耐力を、従来の絶縁構造に比
べ極めて高くすることができる。As described above, the primary coil 4 is connected to the end insulator 9.
At the same time, since the wrapping is performed by the wrapping insulating sheet 8 made of a silicon rubber sheet and having a high insulating performance, the dielectric strength between the coil end and the iron core 1 can be extremely increased as compared with the conventional insulating structure.
【００２３】例えば、３０ｋＶの絶縁耐力を持つ変圧器
の場合、図２に示すように、端部絶縁物の幅Ｗ１（端部
絶縁物９と外側端部絶縁物１０の合わせた幅）は、約１
５mmと短くできると共に、鉄心１と外側端部絶縁物１０
の間の空間距離Ｗ２は約５mmと、図５に示す従来のもの
に比べ、極めて短くすることができる。このため、高い
絶縁耐力を保持しながら、変圧器の構造を小型化するこ
とができる。For example, in the case of a transformer having a dielectric strength of 30 kV, as shown in FIG. 2, the width W1 of the end insulator (the combined width of the end insulator 9 and the outer end insulator 10) is: About 1
It can be as short as 5 mm, and the iron core 1 and the outer end insulator 10
Is about 5 mm, which is much shorter than the conventional one shown in FIG. For this reason, the structure of the transformer can be reduced in size while maintaining high dielectric strength.
【００２４】なお、上記実施例は、本発明のコイルの絶
縁構造を乾式変圧器に適用した例であるが、この絶縁構
造は、変圧器の他、リアクトルなどにも適用することが
できる。Although the above embodiment is an example in which the coil insulation structure of the present invention is applied to a dry transformer, the insulation structure can be applied to a reactor as well as a transformer.
【図１】本発明のコイル絶縁構造を適用した乾式変圧器
の半断面図である。FIG. 1 is a half sectional view of a dry transformer to which a coil insulation structure of the present invention is applied.
【図２】図１の変圧器の部分拡大断面図である。FIG. 2 is a partially enlarged cross-sectional view of the transformer of FIG.
【図３】コイルの絶縁構造を工程順に示す説明斜視図で
ある。FIG. 3 is an explanatory perspective view showing an insulating structure of a coil in a process order.
【図４】コイルの絶縁構造を工程順に示す説明斜視図で
ある。FIG. 4 is an explanatory perspective view showing the insulating structure of the coil in the order of steps.
【図５】従来の乾式変圧器の部分拡大断面図である。FIG. 5 is a partially enlarged cross-sectional view of a conventional dry-type transformer.
【符号の説明】 １−鉄心 ２−コイルボビン ３−二次コイル ４−一次コイル ５−内側絶縁物 ６−外周絶縁物 ７−端部絶縁物 ８−包み込み絶縁シート ９−端部絶縁物[Description of Signs] 1-iron core 2-coil bobbin 3-secondary coil 4-primary coil 5-inside insulator 6-peripheral insulator 7-end insulator 8-wrapping insulating sheet 9-end insulator
Claims (3)
縁構造において、 ゴム状弾性体からなる包み込み絶縁シートが該コイルを
包むように配設され、該包み込み絶縁シートの周囲に外
周絶縁物が巻き付けて配設されていることを特徴とする
コイルの絶縁構造。1. An insulating structure of a coil wound around an outer periphery of an iron core, wherein a wrapping insulating sheet made of a rubber-like elastic body is disposed so as to wrap the coil, and an outer circumferential insulator is provided around the wrapping insulating sheet. An insulating structure for a coil, which is wound and disposed.
縁構造において、 プリプレグシートからなる包み込み絶縁シートが該コイ
ルを包むように配設され、該包み込み絶縁シートの周囲
に外周絶縁物が巻き付けて配設されていることを特徴と
するコイルの絶縁構造。2. An insulating structure of a coil wound around an outer periphery of an iron core, wherein a wrapped insulating sheet made of a prepreg sheet is disposed so as to wrap the coil, and an outer peripheral insulator is wound around the wrapped insulating sheet. An insulating structure for a coil, which is provided.
るコイルの端部に端部絶縁物がコイルの各巻き層に対応
して巻装され、且つ、該包み込み絶縁シートの外側端部
に外側端部絶縁物が配設された請求項１又は２記載のコ
イルの絶縁構造。3. An end insulator is wound around an end of the coil surrounded by the wrapped insulating sheet corresponding to each winding layer of the coil, and an outer end is formed on an outer end of the wrapped insulating sheet. 3. The insulating structure for a coil according to claim 1, wherein an insulating material is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9310300A JPH11144979A (en) | 1997-11-12 | 1997-11-12 | Insulating structure of coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9310300A JPH11144979A (en) | 1997-11-12 | 1997-11-12 | Insulating structure of coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11144979A true JPH11144979A (en) | 1999-05-28 |
Family
ID=18003573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9310300A Pending JPH11144979A (en) | 1997-11-12 | 1997-11-12 | Insulating structure of coil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11144979A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102800466A (en) * | 2011-05-23 | 2012-11-28 | 中变集团上海变压器有限公司 | Dry-type transformer with integrated coil structure |
-
1997
- 1997-11-12 JP JP9310300A patent/JPH11144979A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102800466A (en) * | 2011-05-23 | 2012-11-28 | 中变集团上海变压器有限公司 | Dry-type transformer with integrated coil structure |
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