JPH10135050A - Dry-type transformer - Google Patents

Dry-type transformer

Info

Publication number
JPH10135050A
JPH10135050A JP8288665A JP28866596A JPH10135050A JP H10135050 A JPH10135050 A JP H10135050A JP 8288665 A JP8288665 A JP 8288665A JP 28866596 A JP28866596 A JP 28866596A JP H10135050 A JPH10135050 A JP H10135050A
Authority
JP
Japan
Prior art keywords
insulator
insulating paper
coil
primary coil
insulating
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
JP8288665A
Other languages
Japanese (ja)
Inventor
Koichi Nagai
幸一 永井
Motoyasu Niwa
基泰 丹羽
Hideyuki Niwa
秀行 丹羽
Original Assignee
Toyo Denki Kk
東洋電機株式会社
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 Toyo Denki Kk, 東洋電機株式会社 filed Critical Toyo Denki Kk
Priority to JP8288665A priority Critical patent/JPH10135050A/en
Publication of JPH10135050A publication Critical patent/JPH10135050A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a dry-type transformer, withstanding a high impulse voltage and manufactured at low cost by using minimum amount of resin mold and an inexpressive insulating paper. SOLUTION: A secondary coil 3 is wound around a coil bobbin 2 attached externally to an iron core 1, and a primary coil 4 is wound via an insulation provided at the outside of the secondary coil 3, and an insulation is placed to cover the outside of the primary coil 4. The recessed areas at the exposed ends of the primary coil surrounded by the ends of the both insulations are molded with a synthetic resin 10. Stepped surfaces with one or a plurality of steps formed at the ends of the both insulations surrounding the recessed areas, and an insulating paper contacting intimately with the synthetic resin 10 is used as the insulations forming the stepped surfaces.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、低圧級の乾式変圧
器に関し、特に高いインパルス電圧に対する耐圧性能を
備えた乾式変圧器に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-voltage dry-type transformer, and more particularly to a dry-type transformer having a withstand voltage against a high impulse voltage.

【0002】[0002]

【従来の技術】電気機器用の変圧器では、低圧級の乾式
変圧器であっても、落雷等による高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、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、或は密着性の良好な高価な絶縁
紙を使用すると共に、高圧コイル全体をエポキシ樹脂で
モールドすることにより、絶縁耐力を高くしている。
2. Description of the Related Art In a transformer for electric equipment, even a low-voltage dry-type transformer may be required to withstand a high impulse voltage due to a lightning strike or the like. In such a case, conventionally, the insulation distance between the high voltage coil (primary coil) and other metal parts is increased, or expensive insulating paper with good adhesion is used, and the entire high voltage coil is made of epoxy resin. By molding with, the dielectric strength is increased.

【0003】[0003]

【発明が解決しようとする課題】しかし、高圧コイルと
他の金属部分の間の絶縁距離を大きくした場合、変圧器
の形状が大形化する問題があり、また、密着性の良好な
高価な絶縁紙を使用し且つ高圧コイル全体をエポキシ樹
脂でモールドする構造の乾式変圧器は、絶縁物の材料費
の増大、樹脂モールドの作業工程の複雑さや樹脂材料の
使用量の増大から製造コストが非常に高くなる問題があ
った。
However, when the insulation distance between the high-voltage coil and other metal parts is increased, there is a problem that the shape of the transformer becomes large, and the cost is high with good adhesion. Dry type transformers that use insulating paper and have a structure in which the entire high-voltage coil is molded with epoxy resin have a very high manufacturing cost due to an increase in material costs for insulators, the complexity of the resin molding work process, and an increase in the amount of resin material used. There was a problem that became expensive.

【0004】そこで、従来、図5に示すように、高圧コ
イル(一次コイル)30の上部と下部の露出部にのみエ
ポキシ樹脂31をモールドした簡易モールド構造の乾式
変圧器の使用が検討された。しかし、この種の乾式変圧
器は、樹脂31で高圧コイル30の露出部をモールド
(コート)することにより、絶縁物(複数の絶縁紙を重
合したもの)32と樹脂31の密着面の界面絶縁破壊は
防止できるものの、絶縁物32が絶縁紙(絶縁フィルム
を含む)を巻き重ねて形成され、各絶縁紙間には僅かな
がら隙間が生じる。
Therefore, conventionally, as shown in FIG. 5, use of a dry-type transformer having a simple mold structure in which an epoxy resin 31 is molded only in an upper and lower exposed portion of a high-voltage coil (primary coil) 30 has been studied. However, in this type of dry transformer, the exposed portion of the high-voltage coil 30 is molded (coated) with the resin 31 so that the insulating material (polymerized plural insulating papers) 32 and the adhesive surface of the resin 31 are insulated. Although breakage can be prevented, the insulator 32 is formed by winding insulating paper (including an insulating film), and a slight gap is generated between the insulating papers.

【0005】このため、高インパルス電圧が印加された
場合、図5に示すように、高圧コイル側の1枚目の絶縁
紙32aに貫通絶縁破壊が発生すると、1枚目と2枚目
の僅かな隙間を経路にして沿面放電破壊が生じ、高圧コ
イル30と鉄心33との間に絶縁破壊が発生しやすいと
いう問題があった。
For this reason, when a high impulse voltage is applied, as shown in FIG. 5, when a through dielectric breakdown occurs in the first insulating paper 32a on the high voltage coil side, the first and second sheets are slightly damaged. There is a problem that surface discharge breakdown occurs along a path of a small gap, and dielectric breakdown easily occurs between the high voltage coil 30 and the iron core 33.

【0006】そこで、絶縁物の絶縁紙を厚くするこ
と、絶縁紙間を接着すること、或は、絶縁物の端部
を樹脂でモールドすることが検討されたが、では絶縁
紙を厚くすると、巻線時にコイルとのなじみが悪く、作
業性や加工性が低下する問題があり、では接着時に空
気を巻き込む恐れがあり接着の信頼性が低く、また、
では、絶縁紙からなる絶縁物の周囲に樹脂を良好にコー
トすることが作業工程などの点から難しいなどの問題が
あった。
Therefore, it has been considered to increase the thickness of the insulating paper of the insulator, to bond the insulating paper to each other, or to mold the end of the insulator with a resin. At the time of winding, there is a problem that the familiarity with the coil is poor, and the workability and workability are deteriorated.
However, there has been a problem that it is difficult to coat the resin around the insulator made of insulating paper satisfactorily from the viewpoint of work steps and the like.

【0007】本発明は、上記の点に鑑みてなされたもの
で、最小限の樹脂モールドで安価な絶縁紙を使用して低
コストで製造することができ、且つ高インパルス電圧に
耐える乾式変圧器を提供することを目的とする。
The present invention has been made in view of the above points, and is a dry type transformer which can be manufactured at a low cost using inexpensive insulating paper with a minimum of resin mold and which can withstand a high impulse voltage. The purpose is to provide.

【0008】[0008]

【課題を解決するための手段】上記目的を達成するため
に、本発明の乾式変圧器は、鉄心に外嵌されたコイルボ
ビンに二次コイルが巻装され、二次コイルの外側に配設
された絶縁物を介して一次コイルが巻装され、一次コイ
ルの外側に絶縁物が包囲するように配設され、両側を両
絶縁物の端部で囲われた一次コイルの露出端面上の凹部
が合成樹脂でモールドされてなる乾式変圧器において、
凹部を囲う両絶縁物の端部に、1個又は複数の段差部を
有する階段面が形成され、階段面を形成する絶縁物に、
合成樹脂との密着性の良好な絶縁紙が配設されたことを
特徴とする。
In order to achieve the above object, a dry transformer of the present invention has a secondary coil wound around a coil bobbin externally fitted to an iron core, and is disposed outside the secondary coil. The primary coil is wound through the insulator, and the insulator is disposed outside the primary coil so that the concave portion on the exposed end face of the primary coil surrounded by both insulator ends on both sides is formed. In a dry-type transformer molded with synthetic resin,
At the ends of both insulators surrounding the recess, a stepped surface having one or more steps is formed, and the insulator forming the stepped surface is
An insulating paper having good adhesion to a synthetic resin is provided.

【0009】なお、ここで絶縁紙とは、パルプを用いて
抄造した安価な絶縁紙、ポリアミド繊維等を用いて抄造
した絶縁紙、及び合成樹脂フィルムを含む概念である。
Here, the term "insulating paper" is a concept including inexpensive insulating paper made by using pulp, insulating paper made by using polyamide fiber, and the like, and synthetic resin film.

【0010】[0010]

【作用・効果】このような構成の乾式変圧器では、一次
コイルと鉄心間に、落雷等による高インパルス電圧が発
生した場合、絶縁性の高い合成樹脂が一次コイルと絶縁
物の端部と密着しているため、その密着面に沿面放電破
壊は発生しない。絶縁破壊が生じる場合には絶縁物の一
次コイルに最も近い絶縁紙に貫通絶縁破壊が発生し、そ
の絶縁紙の内側に沿って沿面放電破壊が発生することに
なる。
[Function / Effect] In a dry transformer having such a configuration, when a high impulse voltage is generated between a primary coil and an iron core due to a lightning strike or the like, a synthetic resin having a high insulating property adheres to the end of the primary coil and an insulator. Therefore, no creeping discharge breakdown occurs on the contact surface. When insulation breakdown occurs, penetration insulation breakdown occurs in the insulation paper closest to the primary coil of the insulator, and creeping discharge breakdown occurs along the inside of the insulation paper.

【0011】しかし、両絶縁物の端部で囲われた一次コ
イルの露出端面上の凹部の両側に、段差部を有する階段
面が形成され、階段面の各段差部を形成する絶縁物に、
合成樹脂との密着性の良好な絶縁紙が使用されるため、
絶縁破壊が発生するためには、各段差部の階段面を形成
する絶縁紙に貫通絶縁破壊が生じる必要がある。
However, on both sides of the concave portion on the exposed end face of the primary coil surrounded by the ends of both insulators, a step surface having a step portion is formed, and the insulator forming each step portion of the step surface has
Because insulating paper with good adhesion to synthetic resin is used,
In order for the dielectric breakdown to occur, it is necessary to cause a through dielectric breakdown in the insulating paper forming the step surface of each step.

【0012】このため、貫通破壊電圧を、従来の乾式変
圧器に比べ、各段差の絶縁紙が持つ貫通破壊電圧をほぼ
積算した値まで引き上げることができ、高インパルス電
圧に対する良好な絶縁耐力を持たせることができる。
For this reason, the through breakdown voltage can be increased to a value obtained by substantially integrating the through breakdown voltage of the insulating paper of each step, as compared with the conventional dry type transformer, and a good dielectric strength against a high impulse voltage can be obtained. Can be made.

【0013】また、絶縁物の殆どをしめる階段面以外の
絶縁紙に、安価な絶縁紙を使用することができるため、
また、合成樹脂のモールドを最小限にできるため、製造
コストをそれ程上げずに、優れた高インパルス電圧に対
する絶縁耐力を有する乾式変圧器を製作することができ
る。
[0013] In addition, since inexpensive insulating paper can be used for insulating paper other than the stair surface where most of the insulating material is formed,
In addition, since the molding of the synthetic resin can be minimized, it is possible to manufacture a dry-type transformer having excellent dielectric strength against a high impulse voltage without increasing the manufacturing cost.

【0014】[0014]

【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。
Embodiments of the present invention will be described below with reference to the drawings.

【0015】図1は本発明を適用した乾式変圧器の断面
図を示している。1は環状の鉄心、2は鉄心1の周囲に
外嵌されたコイルボビンであり、コイルボビン2上には
先ず二次コイル(低圧コイル)3が巻装され、その外周
に第一絶縁物5と第二絶縁物6を介して一次コイル(高
圧コイル)4が巻装される。
FIG. 1 is a sectional view of a dry-type transformer to which the present invention is applied. Reference numeral 1 denotes an annular core, and 2 denotes a coil bobbin which is fitted around the core 1. A secondary coil (low-voltage coil) 3 is first wound on the coil bobbin 2, and a first insulator 5 and a second The primary coil (high-voltage coil) 4 is wound via the two insulators 6.

【0016】さらに、一次コイル4の外側に第三絶縁物
7と第四絶縁物8が包囲するように配設され、第四絶縁
物8の外周に外周用絶縁紙9が配設される。
Further, a third insulator 7 and a fourth insulator 8 are disposed outside the primary coil 4 so as to surround them, and an outer peripheral insulating paper 9 is disposed around the outer periphery of the fourth insulator 8.

【0017】即ち、第一絶縁物5は、絶縁紙を例えば1
8枚重ねて、つまり二次コイル3の外周に18回巻き付
けて形成され、その第一絶縁物5の外側に1枚の絶縁紙
からなる第二絶縁物6が重ねられる。第二絶縁物6の外
側に一次コイル4が巻装され、その一次コイル4の外側
に1枚の通常の絶縁紙からなる第三絶縁物7が重ねられ
る。
That is, the first insulator 5 is made of insulating paper such as 1
Eight sheets are formed, that is, formed by winding 18 times around the outer periphery of the secondary coil 3, and a second insulator 6 made of one piece of insulating paper is stacked outside the first insulator 5. The primary coil 4 is wound around the outside of the second insulator 6, and the third insulator 7 made of one piece of ordinary insulating paper is stacked outside the primary coil 4.

【0018】そして、第三絶縁物7の外側に、絶縁紙を
例えば18枚重ね合せてなる第四絶縁物8が重ねられ
る。さらに、第四絶縁物8の外側に外周用絶縁紙9がそ
れを包囲するように配設される。
Then, a fourth insulator 8 formed by laminating, for example, 18 sheets of insulating paper is placed outside the third insulator 7. Further, an outer peripheral insulating paper 9 is arranged outside the fourth insulator 8 so as to surround the fourth insulator 8.

【0019】上記第一絶縁物5と第四絶縁物8に使用さ
れる絶縁紙は主に安価な絶縁紙又はポリエステルフィル
ムであるが、図2に示すように、最も一次コイル4側に
近い絶縁紙5aと8aには、合成樹脂との密着性の良好
なポリアミド繊維紙、或はPEN(ポリエチレンナフタ
レート樹脂)フィルムが使用される。また、第二絶縁物
6と第三絶縁物7の絶縁紙、及び外周用絶縁紙9には、
合成樹脂との密着性の良好なポリアミド繊維紙、或はP
EN(ポリエチレンナフタレート樹脂)フィルムが使用
される。また、これらの絶縁紙5a,8a、第二・第三
絶縁物6、7の絶縁紙、外周用絶縁紙9の厚さは、安価
な絶縁紙に比べて厚く、その貫通絶縁破壊電圧はより高
くなっている。
The insulating paper used for the first insulator 5 and the fourth insulator 8 is mainly inexpensive insulating paper or polyester film. However, as shown in FIG. 2, the insulating paper closest to the primary coil 4 side is used. As the papers 5a and 8a, a polyamide fiber paper or a PEN (polyethylene naphthalate resin) film having good adhesion to a synthetic resin is used. In addition, the insulating paper of the second insulator 6 and the third insulator 7 and the insulating paper 9 for the outer periphery include:
Polyamide fiber paper with good adhesion to synthetic resin or P
An EN (polyethylene naphthalate resin) film is used. The thickness of the insulating papers 5a and 8a, the insulating paper of the second and third insulators 6 and 7, and the insulating paper 9 for the outer periphery are thicker than inexpensive insulating paper, and the through dielectric breakdown voltage is higher. Is getting higher.

【0020】また、第一絶縁物5と第四絶縁物8の幅は
一次コイル4の巻幅より大きく形成され、第二絶縁物6
と第三絶縁物7の幅は一次コイル4の巻幅より大きく第
一、第四絶縁物5、8より小さく形成される。これによ
り、第二絶縁物6と第三絶縁物7の上端部と下端部の近
傍で段差部が形成されると共に、一次コイル4の上方と
下方にその段差部による階段面を有する凹部が形成され
る。
The width of the first insulator 5 and the fourth insulator 8 is formed to be larger than the winding width of the primary coil 4, and the width of the second insulator 6
The width of the first and fourth insulators 7 is larger than the winding width of the primary coil 4 and smaller than the first and fourth insulators 5 and 8. As a result, a step is formed near the upper end and the lower end of the second insulator 6 and the third insulator 7, and a recess having a step surface is formed above and below the primary coil 4. Is done.

【0021】そして、このような構成の凹部内に、つま
り一次コイル4の上部と下部の露出部を覆い、且つ第二
絶縁物6と第三絶縁物7の上端部と下端部の段差部の階
段面を覆うように、エポキシ樹脂等の接着性の良い合成
樹脂10が上記凹部内にモールド(コート)される。こ
れにより、合成樹脂10は、第一絶縁物5の絶縁紙5
a、第二絶縁物6、第三絶縁物7、及び第四絶縁物8の
絶縁紙8aの上端部下端部の端面と良好に密着する。
The stepped portion between the upper end and the lower end of the second insulator 6 and the third insulator 7 covers the recessed portion having such a structure, that is, the upper and lower exposed portions of the primary coil 4. A synthetic resin 10 having good adhesiveness such as an epoxy resin is molded (coated) in the recess so as to cover the step surface. Thereby, the synthetic resin 10 is made of the insulating paper 5 of the first insulator 5.
a, the second insulator 6, the third insulator 7, and the fourth insulator 8 are in good contact with the end surfaces of the upper end and the lower end of the insulating paper 8a.

【0022】このような構成の乾式変圧器では、例えば
一次コイル4と鉄心1間に、落雷等による高インパルス
電圧が発生した場合であっても、絶縁性の高い合成樹脂
10が第一絶縁物5の絶縁紙5a、第二絶縁物6、第三
絶縁物7、及び第四絶縁物8の絶縁紙8aの上端部下端
部の端面と密着しているため、そこに沿面放電破壊は発
生せず、絶縁破壊が生じるとしたら、図2に示すよう
に、第二絶縁物6と第一絶縁物5の絶縁紙5a、又は第
三絶縁物7と第四絶縁物8の絶縁紙8aに貫通絶縁破壊
が発生し、第一絶縁物5の絶縁紙5aの内面、又は第四
絶縁物8の絶縁紙8aの外面に沿面放電破壊が発生する
ことになる。
In the dry-type transformer having such a configuration, for example, even when a high impulse voltage is generated between the primary coil 4 and the iron core 1 due to a lightning strike or the like, the synthetic resin 10 having a high insulating property is used as the first insulator. 5, the insulating paper 5a, the second insulating material 6, the third insulating material 7, and the fourth insulating material 8 are in close contact with the upper and lower end surfaces of the insulating paper 8a. If dielectric breakdown occurs, as shown in FIG. 2, penetrate through the insulating paper 5a of the second insulator 6 and the first insulator 5, or the insulating paper 8a of the third insulator 7 and the fourth insulator 8. Insulation breakdown occurs, and creeping discharge breakdown occurs on the inner surface of the insulating paper 5a of the first insulator 5 or on the outer surface of the insulating paper 8a of the fourth insulator 8.

【0023】したがって、この乾式変圧器の絶縁破壊電
圧は、図5に示すような従来のものに比べ、絶縁性の高
い絶縁紙1枚分の貫通破壊電圧だけ向上することにな
り、高インパルス電圧に対する絶縁耐力を持たせること
ができる。
Therefore, the breakdown voltage of this dry type transformer is improved by the penetration breakdown voltage of one insulating paper having a high insulating property as compared with the conventional one as shown in FIG. Can have dielectric strength.

【0024】このように、絶縁紙の殆どをしめる第一絶
縁物5と第四絶縁物8の絶縁紙に安価な絶縁紙を使用す
ることができるため、製造コストをそれ程上げずに、優
れた高インパルス電圧に対する絶縁耐力を有する乾式変
圧器を製作することができる。
As described above, since inexpensive insulating paper can be used as the insulating paper of the first insulating material 5 and the fourth insulating material 8 that make up most of the insulating paper, an excellent manufacturing cost can be obtained without increasing the manufacturing cost. A dry type transformer having a dielectric strength against a high impulse voltage can be manufactured.

【0025】図3は他の実施例を示し、この例では、第
一絶縁物15〜第四絶縁物18の上端部と下端部が内側
の一次コイル4に向って複数段の階段状となるように形
成される。
FIG. 3 shows another embodiment. In this embodiment, the upper end and the lower end of the first to fourth insulators 15 to 18 have a plurality of steps toward the inner primary coil 4. It is formed as follows.

【0026】即ち、図4の絶縁物の拡大図に示すよう
に、第一絶縁物15は、幅が相違した複数の絶縁紙群を
有し、外側になるほどその幅が小さくなるように各絶縁
紙群が配置されて、一次コイル外周の凹部側に例えば4
つの段差部を持つように形成される。また、第四絶縁物
18の各絶縁紙も、同様に、幅が相違した複数の絶縁紙
群を有し、内側になるほどその幅が小さくなるように各
絶縁紙群が配置されて、一次コイル外周の凹部側に例え
ば4つの段差部を持つように形成される。
That is, as shown in the enlarged view of the insulator in FIG. 4, the first insulator 15 has a plurality of groups of insulating papers having different widths. A paper group is arranged, and for example, 4
It is formed to have two steps. Similarly, each of the insulating papers of the fourth insulator 18 also has a plurality of insulating paper groups having different widths, and the insulating paper groups are arranged such that the width decreases toward the inside, and the primary coil It is formed to have, for example, four step portions on the concave side of the outer periphery.

【0027】第一絶縁物15と第四絶縁物18の各段部
(各絶縁紙群)の第一枚目の絶縁紙15a、18aは、
絶縁紙より厚さが厚く、合成樹脂との密着性の良好なポ
リアミド繊維紙、或はPEN(ポリエチレンナフタレー
ト樹脂)フィルムが使用される。そして、最も一次コイ
ル4に近い側に配置される最も幅の狭い第二絶縁物16
と第三絶縁物17の絶縁紙は、同様に、安価な絶縁紙よ
り厚さが厚く、合成樹脂との密着性の良好なポリアミド
繊維紙、或はPEN(ポリエチレンナフタレート樹脂)
フィルムから形成される。
The first insulating papers 15a and 18a of each step (each insulating paper group) of the first insulator 15 and the fourth insulator 18 are:
Polyamide fiber paper, which is thicker than insulating paper and has good adhesion to synthetic resin, or PEN (polyethylene naphthalate resin) film is used. Then, the second insulator 16 having the narrowest width and disposed closest to the primary coil 4.
Similarly, the insulating paper of the third insulating material 17 is thicker than inexpensive insulating paper and has good adhesion to synthetic resin, such as polyamide fiber paper or PEN (polyethylene naphthalate resin).
Formed from film.

【0028】これにより、第一絶縁物5と第二絶縁物
6、及び第三絶縁物7と第四絶縁物8の上端部と下端部
で徐々に変化する複数の段差部が形成されると共に、一
次コイル4の上方と下方にその段差部による階段面を有
する凹部が形成される。そして、各一定形状の所定枚数
の絶縁紙は一次コイル4に近い第二絶縁物16と第三絶
縁物17の絶縁紙の幅は最も小さく形成される。そし
て、一次コイル4の上部と下部の露出部を覆い、凹部の
階段面を覆うように、エポキシ樹脂等の接着性の良い合
成樹脂20が上記と同様にモールド(コート)される。
Thus, a plurality of steps which gradually change at the upper end and the lower end of the first insulator 5 and the second insulator 6 and the third insulator 7 and the fourth insulator 8 are formed. Above and below the primary coil 4, a recess having a stepped surface due to the step is formed. In addition, the predetermined number of insulating papers each having a certain shape are formed such that the width of the insulating papers of the second insulator 16 and the third insulator 17 near the primary coil 4 is the smallest. Then, a synthetic resin 20 having good adhesiveness such as epoxy resin is molded (coated) in the same manner as described above so as to cover the upper and lower exposed portions of the primary coil 4 and to cover the stepped surface of the concave portion.

【0029】このような構成の乾式変圧器では、例えば
一次コイル4と鉄心間に、落雷等による高インパルス電
圧が発生した場合、絶縁性の高い合成樹脂20が第一絶
縁物15と第二絶縁物16及び第三絶縁物17と第四絶
縁物18の上端部下端部の端面と密着しているため、そ
こに沿面放電破壊は発生せず、絶縁破壊が生じるとした
ら、合成樹脂20が絶縁物と密着する部分に複数の段差
部を持つ階段面が形成されるため、第二絶縁物16と第
一絶縁物15の殆どの絶縁紙、又は第三絶縁物17と第
四絶縁物18の殆どの絶縁紙に貫通絶縁破壊が発生し、
且つ第一絶縁物15の最も内側の絶縁紙15aの内面、
又は第四絶縁物18の最も外側の絶縁紙18aの外面に
沿面放電破壊が発生することになる。
In the dry-type transformer having such a configuration, for example, when a high impulse voltage is generated between the primary coil 4 and the iron core due to a lightning strike or the like, the synthetic resin 20 having a high insulating property is connected to the first insulator 15 and the second insulating material. Since the object 16, the third insulator 17 and the end face of the upper end and the lower end of the fourth insulator 18 are in close contact with each other, no creeping discharge breakdown occurs there. Since a stepped surface having a plurality of steps is formed in a portion in close contact with the object, most of the insulating paper of the second insulator 16 and the first insulator 15 or the third insulator 17 and the fourth insulator 18 Through insulation breakdown occurs on most insulating papers,
And the inner surface of the innermost insulating paper 15a of the first insulator 15,
Alternatively, creeping discharge breakdown occurs on the outer surface of the outermost insulating paper 18a of the fourth insulator 18.

【0030】したがって、この乾式変圧器の絶縁破壊電
圧は、図5に示すような従来のものに比べ、極めて多く
の枚数の絶縁紙が有する貫通破壊電圧だけ向上すること
になり、高インパルス電圧に対するより大きな絶縁耐力
を持たせることができる。
Therefore, the breakdown voltage of this dry transformer is improved by the penetration breakdown voltage of an extremely large number of insulating papers as compared with the conventional one as shown in FIG. Greater dielectric strength can be provided.

【0031】なお、この種の乾式変圧器には、一次コイ
ルと二次コイルの混触を防止するために、銅板或はアル
ミニウム板の混触防止板を配設する場合があるが、その
ような場合には、一次コイル4と二次コイル3間の絶縁
物内、つまり第一絶縁物5、15内に、混触防止板を介
挿すればよい。
In this type of dry-type transformer, a copper plate or an aluminum plate may be provided with a contact prevention plate to prevent contact between the primary coil and the secondary coil. In this case, the contact prevention plate may be inserted in the insulator between the primary coil 4 and the secondary coil 3, that is, in the first insulators 5 and 15.

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

【図1】本発明の一実施例を示す乾式変圧器の断面図で
ある。
FIG. 1 is a cross-sectional view of a dry transformer showing one embodiment of the present invention.

【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】他の実施例の乾式変圧器の部分断面図である。FIG. 3 is a partial cross-sectional view of a dry transformer according to another embodiment.

【図4】同変圧器の絶縁物の配置を示す断面説明図であ
る。
FIG. 4 is an explanatory sectional view showing an arrangement of insulators of the transformer.

【図5】従来の乾式変圧器の部分断面図である。FIG. 5 is a partial sectional view of a conventional dry-type transformer.

【符号の説明】[Explanation of symbols]

1−鉄心 2−コイルボビン 3−二次コイル 4−一次コイル 5−第一絶縁物 6−第二絶縁物 7−第三絶縁物 8−第四絶縁物 1-iron core 2-coil bobbin 3-secondary coil 4-primary coil 5-first insulator 6-second insulator 7-third insulator 8-fourth insulator

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 鉄心に外嵌されたコイルボビンに二次コ
イルが巻装され、該二次コイルの外側に配設された絶縁
物を介して一次コイルが巻装され、該一次コイルの外側
に絶縁物が包囲するように配設され、両側を該両絶縁物
の端部で囲われた該一次コイルの露出端面上の凹部が合
成樹脂でモールドされてなる乾式変圧器において、 該凹部を囲う該両絶縁物の端部に、1個又は複数の段差
部を有する階段面が形成され、該階段面を形成する絶縁
物に、該合成樹脂との密着性の良好な絶縁紙が配設され
たことを特徴とする乾式変圧器。
1. A secondary coil is wound around a coil bobbin externally fitted to an iron core, a primary coil is wound via an insulator disposed outside the secondary coil, and a coil is wound around an outside of the primary coil. A dry type transformer in which an insulator is provided so as to surround it, and a concave portion on an exposed end surface of the primary coil, which is surrounded on both sides by ends of the insulator, is molded with a synthetic resin. A stepped surface having one or a plurality of step portions is formed at the ends of the insulators, and insulating paper having good adhesion to the synthetic resin is disposed on the insulator forming the stepped surface. A dry-type transformer characterized by the following.
【請求項2】 前記一次コイルの内側の絶縁物が複数の
絶縁紙を重ね合せた第一絶縁物と1枚の絶縁紙を持つ第
二絶縁物とからなり、該第二絶縁物の幅が該第一絶縁物
の幅より小さく形成され、該第一絶縁物の最も外側の絶
縁紙と該第二絶縁物の絶縁紙に該合成樹脂との密着性の
良好な絶縁紙が使用され、前記一次コイルの外側の絶縁
物が複数の絶縁紙を重ね合せた第四絶縁物と1枚の絶縁
紙を持つ第三絶縁物とからなり、該第三絶縁物の幅が該
第四絶縁物の幅より小さく形成され、該第四絶縁物の最
も内側の絶縁紙と該第三絶縁物の絶縁紙に該合成樹脂と
の密着性の良好な絶縁紙が使用されたことを特徴とする
請求項1記載の乾式変圧器。
2. The insulator inside the primary coil comprises a first insulator having a plurality of insulating papers laminated and a second insulator having one insulating paper, and the width of the second insulator is An insulating paper having good adhesion with the synthetic resin is used for the outermost insulating paper of the first insulator and the insulating paper of the second insulator, which is formed to be smaller than the width of the first insulator. The insulator outside the primary coil comprises a fourth insulator in which a plurality of insulating papers are overlapped and a third insulator having one insulating paper, and the width of the third insulator is equal to that of the fourth insulator. The insulating paper having good adhesion to the synthetic resin is used for the innermost insulating paper of the fourth insulator and the insulating paper of the third insulator, which are formed smaller than the width. The dry transformer according to claim 1.
【請求項3】 前記第一絶縁物と第四絶縁物の端部に複
数の段差部を有する階段面が形成され、該階段面を形成
する絶縁物に、前記合成樹脂との密着性の良好な絶縁紙
が配設されたことを特徴とする請求項2記載の乾式変圧
器。
3. A stepped surface having a plurality of steps is formed at an end of the first insulator and the fourth insulator, and the insulator forming the stepped surface has good adhesion to the synthetic resin. 3. The dry transformer according to claim 2, wherein a suitable insulating paper is provided.
JP8288665A 1996-10-30 1996-10-30 Dry-type transformer Pending JPH10135050A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8288665A JPH10135050A (en) 1996-10-30 1996-10-30 Dry-type transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8288665A JPH10135050A (en) 1996-10-30 1996-10-30 Dry-type transformer

Publications (1)

Publication Number Publication Date
JPH10135050A true JPH10135050A (en) 1998-05-22

Family

ID=17733101

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8288665A Pending JPH10135050A (en) 1996-10-30 1996-10-30 Dry-type transformer

Country Status (1)

Country Link
JP (1) JPH10135050A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007259627A (en) * 2006-03-24 2007-10-04 Honda Motor Co Ltd Insulation structure of rotary electric machine
CN105761911A (en) * 2016-04-18 2016-07-13 江西特种变压器厂 Epoxy pouring transformer of compound main air channel insulation structure and manufacturing method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6048218U (en) * 1983-09-09 1985-04-04
JPH0193107A (en) * 1987-10-02 1989-04-12 Matsushita Electric Ind Co Ltd Molded coil

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6048218U (en) * 1983-09-09 1985-04-04
JPH0193107A (en) * 1987-10-02 1989-04-12 Matsushita Electric Ind Co Ltd Molded coil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007259627A (en) * 2006-03-24 2007-10-04 Honda Motor Co Ltd Insulation structure of rotary electric machine
CN105761911A (en) * 2016-04-18 2016-07-13 江西特种变压器厂 Epoxy pouring transformer of compound main air channel insulation structure and manufacturing method thereof

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