JPH06224064A - Manufacture of electromagnetic induction apparatus winding - Google Patents

Manufacture of electromagnetic induction apparatus winding

Info

Publication number
JPH06224064A
JPH06224064A JP5009628A JP962893A JPH06224064A JP H06224064 A JPH06224064 A JP H06224064A JP 5009628 A JP5009628 A JP 5009628A JP 962893 A JP962893 A JP 962893A JP H06224064 A JPH06224064 A JP H06224064A
Authority
JP
Japan
Prior art keywords
conductor
elastomer
winding
electromagnetic induction
winding body
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
JP5009628A
Other languages
Japanese (ja)
Other versions
JP2930273B2 (en
Inventor
Keiichi Abe
景一 阿部
Hiroshi Sonobe
浩 園部
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.)
Toshiba Corp
Original Assignee
Toshiba 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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP5009628A priority Critical patent/JP2930273B2/en
Publication of JPH06224064A publication Critical patent/JPH06224064A/en
Application granted granted Critical
Publication of JP2930273B2 publication Critical patent/JP2930273B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Coils Of Transformers For General Uses (AREA)
  • Insulating Of Coils (AREA)

Abstract

PURPOSE:To provide a small-sized molded coil, whose dielectric breakdown strength is improved. CONSTITUTION:A bare conductor 14 and an elastomer 15 are simultaneously wound to form a winding body 13. At this time, as the elastomer 15 has an elasticity, it is deformed as it is wound and is brought in a state that it is closely adhered to the conductor 14 in such a way as to encircle the conductor 14. Subsequently, when the conductor 14 is molded with an epoxy resin 18, the conductor 14 is further closely adhered to the resin 18 because the elastomer 15 has a thermoplasticity and at the same time, fine void parts between the conductor 14 and the elastomer 15 are filled. Thereby, a molded coil 11, whose dielectric breakdown strength is improved, can be obtained.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、変圧器等の静止誘導機
器に用いられる電磁誘導機器巻線の製造方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an electromagnetic induction device winding used for a static induction device such as a transformer.

【0002】[0002]

【従来の技術】従来、変圧器などに用いられるエポキシ
モールドコイルは、例えば、図4に示すように、導体1
に絶縁物2を被覆した素線3を使用し、この素線3を巻
形に巻回して巻線体4を形成し、しかる後にエポキシ樹
脂等により注型してモールドコイル5として形成するよ
うになっている。この場合、絶縁物2としては耐熱性に
も優れた合成絶縁紙を用いている。
2. Description of the Related Art Conventionally, an epoxy molded coil used in a transformer or the like has a conductor 1 as shown in FIG.
A wire 3 covered with an insulator 2 is used, and the wire 3 is wound into a winding shape to form a winding body 4. After that, the winding body 4 is cast with an epoxy resin or the like to form a molded coil 5. It has become. In this case, as the insulator 2, synthetic insulating paper excellent in heat resistance is used.

【0003】[0003]

【発明が解決しようとする課題】ところで、上述のよう
な従来のような方法で製作されたモールドコイル5にお
いては、絶縁物2を被覆した素線3を巻回するため、図
4にも示すように、隣接する素線3間に楔状部分Aが発
生する。この楔状部分Aは電界が集中しやすく、絶縁破
壊電圧の低下を招きやすい。また、素線3内部において
も、絶縁物2として用いる合成絶縁紙と導体1との界面
部に微小なボイドが発生するのを完全に除去することが
できないため、絶縁性能を向上させるのには限界があっ
た。
By the way, in the molded coil 5 manufactured by the conventional method as described above, since the wire 3 covered with the insulator 2 is wound, it is also shown in FIG. As described above, the wedge-shaped portion A is generated between the adjacent wires 3. In this wedge-shaped portion A, the electric field is likely to be concentrated and the breakdown voltage is likely to be lowered. In addition, since it is not possible to completely eliminate generation of minute voids in the interface between the synthetic insulating paper used as the insulator 2 and the conductor 1 even inside the wire 3, it is necessary to improve the insulation performance. There was a limit.

【0004】この場合、従来方式によって製造されたモ
ールドコイルにおいては、変圧器に適用する場合に絶縁
性能に関して問題ないのは、例えば6.6kVクラス程
度までである。したがって、更に適用電圧クラスの高い
変圧器に適用する場合には、絶縁破壊強度に対する信頼
性が低下してしまうため、モールドコイル5の素線3間
やセクション間の電位傾度を低減させるような構造に変
更せざるを得ず、結果として、全体が大形化してしまう
状況にあった。
In this case, the molded coil manufactured by the conventional method has no problem in insulation performance when applied to a transformer, for example, up to about 6.6 kV class. Therefore, when applied to a transformer having a higher applied voltage class, the reliability with respect to the dielectric breakdown strength decreases, so that the potential gradient between the wires 3 or sections of the mold coil 5 is reduced. There was no choice but to change to, and as a result, the whole situation became large.

【0005】本発明は、上記事情に鑑みてなされたもの
で、その目的は、電位傾度を高めた状態でも絶縁破壊に
対する信頼性を向上できる電磁誘導機器巻線の製造方法
を提供するにある。
The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for manufacturing an electromagnetic induction device winding capable of improving the reliability against dielectric breakdown even in a state where the potential gradient is increased.

【0006】[0006]

【課題を解決するための手段】本発明の電磁誘導機器巻
線の製造方法は、裸導体とエラストマとを重ねた状態で
同時に巻回することによりそのエラストマを裸導体の外
周部に密着させた状態に巻線体を形成する第1の工程
と、この第1の工程により形成された巻線体を樹脂でモ
ールド成形する第2の工程とから構成したところに特徴
を有する。また、第1の工程で使用するエラストマを、
あらかじめ裸導体に対応した形状に形成すると良い。
According to the method for manufacturing an electromagnetic induction device winding of the present invention, a bare conductor and an elastomer are wound at the same time in a stacked state so that the elastomer is brought into close contact with the outer peripheral portion of the bare conductor. It is characterized in that it comprises a first step of forming a winding body in a state and a second step of molding the winding body formed by this first step with resin. In addition, the elastomer used in the first step,
It is recommended to form in advance a shape corresponding to the bare conductor.

【0007】[0007]

【作用】請求項1記載の電磁誘導機器巻線の製造方法に
よれば、第1の工程において、裸導体とエラストマを重
ねた状態で巻回すると、巻回するときにエラストマが変
形して裸導体と密着した状態で裸導体を包囲するように
巻線体が形成される。これにより、裸導体の端部にも絶
縁物としてのエラストマが充填されることになり、隣接
する裸導体との間に楔状部分が形成されることがなくな
る。この後、第2の工程において樹脂により巻線体をモ
ールド成形すると、裸導体を厚い絶縁被覆で密着性を高
くした状態で絶縁することができ、さらに、裸導体端部
の微小な空隙部分にも絶縁物が充填されるようになり、
全体として絶縁破壊電圧を向上させることができるよう
になる。
According to the method of manufacturing a winding of an electromagnetic induction device according to claim 1, in the first step, when the bare conductor and the elastomer are wound in a state of being overlapped with each other, the elastomer is deformed at the time of winding and is bare. A winding body is formed so as to surround the bare conductor while being in close contact with the conductor. As a result, the end portion of the bare conductor is also filled with the elastomer as an insulator, and a wedge-shaped portion is not formed between the bare conductor and the adjacent bare conductor. After that, when the winding body is molded with resin in the second step, the bare conductor can be insulated with a thick insulating coating in a state where the adhesion is high, and further, the bare conductor end portion is covered with a minute void portion. Will also be filled with insulation,
The dielectric breakdown voltage can be improved as a whole.

【0008】請求項2記載の電磁誘導機器巻線の製造方
法によれば、裸導体に重ねるエラストマの形状が裸導体
の形状に対応しているので、巻回するときに、さらに導
体とエラストマとの密着性を向上させることができ、絶
縁破壊電圧を向上させることができる。
According to the method of manufacturing an electromagnetic induction device winding of the second aspect, since the shape of the elastomer to be overlapped with the bare conductor corresponds to the shape of the bare conductor, the conductor and the elastomer are further wound when the winding is performed. It is possible to improve the adhesiveness of, and it is possible to improve the dielectric breakdown voltage.

【0009】[0009]

【実施例】以下、本発明を変圧器のモールドコイルに適
用した場合の第1の実施例について図1および図2を参
照しながら説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is applied to a molded coil of a transformer will be described below with reference to FIGS.

【0010】図1は、電磁誘導機器巻線としてのモール
ドコイル11の断面を示すもので、絶縁筒12に巻線体
13が巻回形成されている。この巻線体13を構成する
導体14は巻回時に外周に絶縁を施していない裸導体で
あり、その周囲には後述する絶縁性を有するエラストマ
15が導体14を包囲するようにして配設されている。
FIG. 1 shows a cross section of a molded coil 11 as a winding of an electromagnetic induction device, in which a winding body 13 is wound around an insulating cylinder 12. The conductor 14 that constitutes the winding body 13 is a bare conductor whose outer circumference is not insulated during winding, and an elastomer 15 having an insulating property, which will be described later, is arranged around the conductor 14 so as to surround the conductor 14. ing.

【0011】絶縁筒12に巻回された導体14の間に
は、その周方向に所定間隔を存してスペーサ16が配設
されており、最外周部には外側絶縁筒17が全体を覆う
ように配設されている。そして、絶縁筒12と外側絶縁
筒17とにより形成された内側の空間部にはエポキシ樹
脂18が充填されモールドコイル11が形成されてい
る。なお、図2は、スペーサ16がない部分の断面状態
を示している。
Spacers 16 are arranged between the conductors 14 wound around the insulating cylinder 12 at a predetermined interval in the circumferential direction, and an outer insulating cylinder 17 covers the entire outer peripheral portion. It is arranged as follows. An epoxy resin 18 is filled in the inner space formed by the insulating cylinder 12 and the outer insulating cylinder 17 to form the molded coil 11. Note that FIG. 2 shows a cross-sectional state of a portion without the spacer 16.

【0012】次に、モールドコイル11の製造方法につ
いて説明する。絶縁性を有すると共に弾性を有するエラ
ストマ15は、例えばポリオレフィン系の熱可塑性を有
するもので、導体14よりも幅広の帯状をなしている。
まず、第1の工程においては、エラストマ15を導体1
4に重ねた状態で同時に巻回することにより巻線体13
を形成する。この場合、エラストマ15は、導体14に
密着した状態で巻回されていくと、弾性変形により導体
14と接している部分は押し潰されてさらに密着するよ
うになり、また、導体14から外れた上下の部分におい
ては導体14を包囲するように変形する。
Next, a method of manufacturing the mold coil 11 will be described. The elastomer 15 having insulation and elasticity is made of, for example, a polyolefin-based thermoplastic and has a band shape wider than the conductor 14.
First, in the first step, the elastomer 15 is connected to the conductor 1.
The winding body 13
To form. In this case, when the elastomer 15 is wound in a state of being in close contact with the conductor 14, the portion in contact with the conductor 14 is crushed by elastic deformation so as to be further in close contact, and is separated from the conductor 14. The upper and lower parts are deformed so as to surround the conductor 14.

【0013】次に、第2の工程においては、形成された
巻線体13をエポキシなどの樹脂を注型することにより
モールド成形する。すなわち、絶縁筒12と外側絶縁筒
17との間の巻線体13が配設されている部分の隙間を
埋めるようにエポキシ樹脂を注型してモールド成形す
る。このとき、エラストマ15は、熱可塑性を有するこ
とから、注型されたエポキシ樹脂の熱硬化時に可塑性を
示し、導体14とさらに密着するようになる。
Next, in the second step, the formed winding body 13 is molded by casting a resin such as epoxy. That is, epoxy resin is cast and molded so as to fill the gap in the portion where the winding body 13 is disposed between the insulating cylinder 12 and the outer insulating cylinder 17. At this time, since the elastomer 15 has thermoplasticity, it exhibits plasticity when the cast epoxy resin is thermoset, and further comes into close contact with the conductor 14.

【0014】この結果、出来上がったモールドコイル1
1の導体14は、あたかも絶縁物で素線絶縁を行ったよ
うな状態に形成され、導体14の端部の微小な空隙部分
にも絶縁物が充填されるようになり、絶縁破壊電圧が向
上されるようになる。また、このとき、エラストマ15
は、導体14とエポキシ樹脂18との熱膨張の違いによ
り発生する応力を吸収する緩衝材としての効果を有する
ので、クラック発生防止の効果がある。
As a result, the finished molded coil 1
The conductor 14 of No. 1 is formed in a state as if the conductor was insulated by an insulator, and the minute void portion at the end of the conductor 14 is also filled with the insulator, so that the dielectric breakdown voltage is improved. Will be done. Also, at this time, the elastomer 15
Has an effect as a cushioning material that absorbs a stress generated due to a difference in thermal expansion between the conductor 14 and the epoxy resin 18, and thus has an effect of preventing crack generation.

【0015】このような本実施例によれば、第1の工程
で、被覆がされていない裸の導体14をエラストマ15
と同時に巻回して巻線体13を形成することにより、エ
ラストマ15を変形させて導体14を包囲した状態で密
着させ、第2の工程で、モールド成形してモールドコイ
ル11を形成するようにしたので、導体14に対してエ
ラストマ15により厚く包囲して且つ密着性が高い状態
に絶縁層を形成でき、また、導体14端部の微小な空隙
部分にも絶縁物を充填することができて、全体として絶
縁破壊電圧を向上でき、さらに、エラストマ15によ
り、導体14とエポキシ樹脂18との間の熱膨張の違い
による応力を緩衝してクラックの発生を防止できる。
According to this embodiment as described above, in the first step, the bare conductor 14 which is not covered is covered with the elastomer 15.
At the same time, the winding body 13 is wound to form the winding body 13 so that the elastomer 15 is deformed so as to be in close contact with the conductor 14 in an enclosed state. In the second step, molding is performed to form the mold coil 11. Therefore, the insulating layer can be formed in a state in which the conductor 14 is thickly surrounded by the elastomer 15 and has high adhesiveness, and the minute void portion at the end of the conductor 14 can be filled with the insulating material. The dielectric breakdown voltage can be improved as a whole, and further, the elastomer 15 can buffer the stress due to the difference in thermal expansion between the conductor 14 and the epoxy resin 18 and prevent the generation of cracks.

【0016】なお、エラストマ15としては、エポキシ
樹脂18の誘電率よりも高い材料で、且つエポキシ樹脂
18と密着性の高いものを用いると、より絶縁破壊電圧
を高くすることができる。
If the elastomer 15 is made of a material having a higher dielectric constant than that of the epoxy resin 18 and high adhesiveness with the epoxy resin 18, the dielectric breakdown voltage can be further increased.

【0017】図3は本発明の第2の実施例を示すもの
で、以下、第1の実施例と異なる部分について説明す
る。すなわち、図3は導体14と同時に巻回するエラス
トマ19の形状を示している。エラストマ19は、あら
かじめ射出成形などにより導体14の形状にフィットす
るように形成されている。また、エラストマ19と導体
14を巻回する際に両者の密着性を向上させるために、
接着シート20を介在させた状態で行うものである。
FIG. 3 shows a second embodiment of the present invention, and the portions different from the first embodiment will be described below. That is, FIG. 3 shows the shape of the elastomer 19 wound at the same time as the conductor 14. The elastomer 19 is formed in advance by injection molding or the like so as to fit the shape of the conductor 14. Further, in order to improve the adhesion between the elastomer 19 and the conductor 14 when they are wound,
This is performed with the adhesive sheet 20 interposed.

【0018】この場合、接着シート20は、ポリオレフ
ィン系の材料からなるもので、エポキシ樹脂の注型後の
加熱硬化時などに加熱されると、エラストマ19と導体
14とを強固に接着するようになっている。そして、こ
のような第2の実施例においても、第1の実施例と同様
の効果が得られると共に、組み立て性が向上するように
なる。
In this case, the adhesive sheet 20 is made of a polyolefin-based material, so that the elastomer sheet 19 and the conductor 14 are firmly adhered to each other when they are heated at the time of heat curing after casting the epoxy resin. Has become. Then, also in the second embodiment as described above, the same effect as that of the first embodiment is obtained, and the assemblability is improved.

【0019】尚、上記実施例においては、エラストマと
して、熱可塑性を有するポリオレフィン系のエラストマ
15を用いた場合について説明したが、これに限らず、
例えば、ポリエステル系のエラストマや、あるいは熱硬
化性を有するウレタン系のエラストマを用いても良い。
In addition, in the above-mentioned embodiment, the case where the polyolefin elastomer 15 having thermoplasticity is used as the elastomer has been described, but the present invention is not limited to this.
For example, polyester-based elastomer or thermosetting urethane-based elastomer may be used.

【0020】[0020]

【発明の効果】以上説明したように、請求項1記載の電
磁誘導機器巻線の製造方法によれば、第1の工程におい
て、裸導体とエラストマとを重ねた状態で同時に巻回す
ることによりそのエラストマを裸導体の外周部に密着さ
せた状態に巻線体を形成し、続く第2の工程において、
その巻線体を樹脂でモールド成形するようにしたので、
巻回するときにエラストマが変形して裸導体と密着した
状態で裸導体を包囲するように巻線体を形成でき、さら
に、裸導体を厚い絶縁被覆で密着性を高くした状態で絶
縁することができると共に、裸導体端部の微小な空隙部
分にも絶縁物が充填されるようになり、全体として絶縁
破壊電圧を向上させることができるという優れた効果を
奏する。
As described above, according to the method for manufacturing the winding of the electromagnetic induction device according to the first aspect, in the first step, the bare conductor and the elastomer are simultaneously wound in a stacked state. The winding body is formed in a state where the elastomer is brought into close contact with the outer peripheral portion of the bare conductor, and in the subsequent second step,
Since the winding body is molded with resin,
The winding body can be formed so as to surround the bare conductor in a state where the elastomer deforms during winding and adheres to the bare conductor, and the bare conductor is insulated with a thick insulating coating to improve adhesion. In addition to that, the insulating material can be filled even in the minute void portion at the end portion of the bare conductor, and the excellent effect that the dielectric breakdown voltage can be improved as a whole is achieved.

【0021】請求項2記載の電磁誘導機器巻線の製造方
法によれば、エラストマを、あらかじめ裸導体に対応し
た形状に形成しておくので、巻回するときに、さらに導
体とエラストマとの密着性を向上させることができ、絶
縁破壊電圧を向上させることができるという優れた効果
を奏する。
According to the method of manufacturing the electromagnetic induction device winding of the second aspect, since the elastomer is formed in a shape corresponding to the bare conductor in advance, the conductor and the elastomer are further adhered when wound. It has an excellent effect that it is possible to improve the property and the dielectric breakdown voltage.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の第1の実施例を示す縦断側面図FIG. 1 is a vertical sectional side view showing a first embodiment of the present invention.

【図2】スペーサがない部分で切断した図1相当図FIG. 2 is a view equivalent to FIG. 1 cut at a portion without a spacer.

【図3】本発明の第2の実施例を示す導体とエラストマ
の斜視図
FIG. 3 is a perspective view of a conductor and an elastomer showing a second embodiment of the present invention.

【図4】従来例を示す図1相当図FIG. 4 is a view corresponding to FIG. 1 showing a conventional example.

【符号の説明】[Explanation of symbols]

11はモールドコイル、12は絶縁筒、14は巻線体、
14は導体、15はエラストマ、16はスペーサ、17
は外側絶縁筒、18はエポキシ樹脂(絶縁物)、19は
エラストマ、20は接着シートである。
11 is a molded coil, 12 is an insulating cylinder, 14 is a winding body,
14 is a conductor, 15 is an elastomer, 16 is a spacer, 17
Is an outer insulating cylinder, 18 is an epoxy resin (insulator), 19 is an elastomer, and 20 is an adhesive sheet.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 // B29K 21:00 B29L 31:34 4F ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 5 Identification number Office reference number FI technical display area // B29K 21:00 B29L 31:34 4F

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 裸導体とエラストマとを重ねた状態で同
時に巻回することによりそのエラストマを裸導体の外周
部に密着させた状態に巻線体を形成する第1の工程と、
この第1の工程により形成された巻線体を樹脂でモール
ド成形する第2の工程とからなる電磁誘導機器巻線の製
造方法。
1. A first step of forming a winding body in a state in which a bare conductor and an elastomer are overlapped and wound simultaneously so that the elastomer is in close contact with an outer peripheral portion of the bare conductor.
A method of manufacturing an electromagnetic induction device winding, comprising a second step of molding the winding body formed by the first step with a resin.
【請求項2】 エラストマは、あらかじめ裸導体に対応
した形状に形成されていることを特徴とする請求項1記
載の電磁誘導機器巻線の製造方法。
2. The method for manufacturing an electromagnetic induction device winding according to claim 1, wherein the elastomer is formed in advance in a shape corresponding to the bare conductor.
JP5009628A 1993-01-25 1993-01-25 Manufacturing method for windings of electromagnetic induction equipment Expired - Lifetime JP2930273B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010040809A (en) * 2008-08-06 2010-02-18 Hitachi Medical Corp High-voltage transformer, and inverter type x-ray high-voltage device using the same
JP2010238920A (en) * 2009-03-31 2010-10-21 Denso Corp Reactor
JP2019161196A (en) * 2018-03-17 2019-09-19 株式会社村田製作所 Coil component
CN112768206A (en) * 2020-12-24 2021-05-07 宁波宁变电力科技股份有限公司 Epoxy-cast dry-type transformer winding capable of improving anti-cracking capacity

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010040809A (en) * 2008-08-06 2010-02-18 Hitachi Medical Corp High-voltage transformer, and inverter type x-ray high-voltage device using the same
JP2010238920A (en) * 2009-03-31 2010-10-21 Denso Corp Reactor
JP2019161196A (en) * 2018-03-17 2019-09-19 株式会社村田製作所 Coil component
US11664155B2 (en) 2018-03-17 2023-05-30 Murata Manufacturing Co., Ltd. Coil component
CN112768206A (en) * 2020-12-24 2021-05-07 宁波宁变电力科技股份有限公司 Epoxy-cast dry-type transformer winding capable of improving anti-cracking capacity
CN112768206B (en) * 2020-12-24 2023-05-16 宁波宁变电力科技股份有限公司 Epoxy casting dry-type transformer winding capable of improving cracking resistance

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