JPH04242910A - Resin-mold type current transformer - Google Patents

Resin-mold type current transformer

Info

Publication number
JPH04242910A
JPH04242910A JP3147216A JP14721691A JPH04242910A JP H04242910 A JPH04242910 A JP H04242910A JP 3147216 A JP3147216 A JP 3147216A JP 14721691 A JP14721691 A JP 14721691A JP H04242910 A JPH04242910 A JP H04242910A
Authority
JP
Japan
Prior art keywords
transformation element
ring
current transformation
thin plate
resin
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
JP3147216A
Other languages
Japanese (ja)
Other versions
JPH0782955B2 (en
Inventor
Kozo Ueda
上田 幸造
Mitsuo Hamada
濱田 光夫
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
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP3147216A priority Critical patent/JPH0782955B2/en
Publication of JPH04242910A publication Critical patent/JPH04242910A/en
Publication of JPH0782955B2 publication Critical patent/JPH0782955B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20Instruments transformers
    • H01F38/22Instruments transformers for single phase ac
    • H01F38/28Current transformers
    • H01F38/30Constructions
    • H01F2038/305Constructions with toroidal magnetic core

Landscapes

  • Regulation Of General Use Transformers (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Insulating Of Coils (AREA)

Abstract

PURPOSE:To obtain a compact and light resin mold type transformer for a current transformation with a mold resin insulator by preventing mechanical stress to a core with a compact configuration positively. CONSTITUTION:In a title item with a current transformation element 12 where a secondary coil 5 is wound around an outer periphery of a ring-shaped core part 1 and a primary conductor 7 which penetrates through this current transformation element 12 in that the current transformation element 12 is insulated by a mold resin 6, a ring-shaped thin plate 9 with a tension having a larger diameter than an outer diameter of the current transformation element 12 is placed in a direction of the outer diameter of the current transformation element 12 and an outer periphery of the current transformation element 12 and the thin plate 9 is wound by a tape material 10, thus forming an space layer 11 between the current transformation element 12 and the thin plate 9 closedly and enabling the current transformation element 12 where this space layer 11 is formed to be insulated by the mold resin 6.

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】0001

【産業上の利用分野】この発明は、変成素子をモールド
樹脂により絶縁する樹脂モールド形変流器に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molded current transformer in which a transformation element is insulated by molded resin.

【0002】0002

【従来の技術】図5は貫通タイプの従来の樹脂モールド
形変流器を示す斜視図、図6はその変流器を一部破断し
て示す正面図、図7は図6のVII−VII断面図であ
り、これらの図において、1は磁気回路を構成すべくリ
ング(円環)状に設けられた鉄心、2はこの鉄心1の外
周面に沿って設けられたコルクシート、3は鉄心1とコ
ルクシート2との外周に巻回されて外周絶縁を施すポリ
エステルテープ等の絶縁テープである。
5 is a perspective view showing a conventional through-type resin molded current transformer, FIG. 6 is a partially cutaway front view of the current transformer, and FIG. 7 is a section VII-VII of FIG. These are cross-sectional views. In these figures, 1 is an iron core provided in a ring shape to constitute a magnetic circuit, 2 is a cork sheet provided along the outer peripheral surface of this iron core 1, and 3 is an iron core. This is an insulating tape such as a polyester tape that is wound around the outer periphery of the cork sheet 1 and the cork sheet 2 to insulate the outer periphery.

【0003】そして、4はこれらの鉄心1,コルクシー
ト2および絶縁テープ3にて構成された鉄心部で、この
鉄心部4の外周に2次巻線5を巻回することにより変成
素子が構成されている。
[0003] Reference numeral 4 denotes an iron core section made up of these iron cores 1, cork sheet 2, and insulating tape 3. By winding a secondary winding 5 around the outer periphery of this iron core section 4, a transformation element is constructed. has been done.

【0004】また、6は1次導体7(リング状の変成素
子を貫通するもの)および取付部品(図示せず)と上記
変成素子とを絶縁するとともに筐体となるエポキシ樹脂
モールド部、8は2次巻線5の両端に接続されこの2次
巻線5の出力をモールド部6の外部に導き出すための2
次端子である。
Further, 6 is an epoxy resin molded part which insulates the primary conductor 7 (which passes through the ring-shaped transformation element) and the mounting parts (not shown) and the transformation element, and also serves as a housing. 2 which are connected to both ends of the secondary winding 5 and lead the output of the secondary winding 5 to the outside of the mold part 6.
This is the next terminal.

【0005】ところで、1次導体7に通電する電流を2
次巻線5等からなる2次回路に精度よく変換するには、
鉄心部4に機械的ストレスによる磁気歪が生じないよう
な構成にして、励磁損を低減する必要がある。
By the way, the current flowing through the primary conductor 7 is
To accurately convert to a secondary circuit consisting of the next winding 5, etc.,
It is necessary to reduce the excitation loss by creating a structure in which magnetostriction due to mechanical stress does not occur in the iron core 4.

【0006】一方、エポキシ樹脂モールド部6の注形硬
化時には、図6に示す周方向αと半径方向βとの硬化収
縮が生じ、この硬化収縮により、変成素子に機械的スト
レスが印加される。これを吸収するために、コルクシー
ト2が緩衝部材として設けられている。
On the other hand, when the epoxy resin mold portion 6 is cast and cured, curing shrinkage occurs in the circumferential direction α and the radial direction β shown in FIG. 6, and this curing shrinkage applies mechanical stress to the conversion element. In order to absorb this, a cork sheet 2 is provided as a buffer member.

【0007】[0007]

【発明が解決しようとする課題】従来の樹脂モールド形
変流器は以上のように構成されているので、エポキシ樹
脂モールド部6の外形,樹脂厚さが大きい場合には、硬
化時の収縮も大きくなる。しかし、コルクシート2の圧
縮率には限度があるため、硬化時の収縮が大きい場合に
は、これを吸収すべく、緩衝層の厚さも大きくする必要
がある。そのため、緩衝層のスペースが大きくなり、変
流器全体の外形,重量が大きくなってしまうなどの課題
があった。
[Problems to be Solved by the Invention] Since the conventional resin molded current transformer is constructed as described above, if the outer diameter of the epoxy resin molded portion 6 and the resin thickness are large, shrinkage during curing may occur. growing. However, since there is a limit to the compressibility of the cork sheet 2, if the shrinkage during curing is large, it is necessary to increase the thickness of the buffer layer in order to absorb this. Therefore, there were problems such as the space for the buffer layer becoming larger and the overall shape and weight of the current transformer becoming larger.

【0008】この発明は上記のような課題を解消するた
めになされたもので、コンパクトな構成で鉄心への機械
的ストレスの付与を確実に防止できるようにして、小形
・軽量で精度のよい樹脂モールド形変流器を得ることを
目的とする。
[0008] This invention was made in order to solve the above-mentioned problems, and it is possible to reliably prevent mechanical stress from being applied to the iron core with a compact structure, and to create a compact, lightweight and highly accurate resin material. The purpose is to obtain a molded current transformer.

【0009】[0009]

【課題を解決するための手段】この発明に係る樹脂モー
ルド形変流器は、変成素子の外径よりも大きな径をもつ
張力のあるリング状薄板を、変成素子の外径方向に配設
するとともに、これらの変成素子と薄板との外周をテー
プ材で巻回することにより、変成素子と薄板との間に空
隙層を密閉形成し、この空隙層を形成した変成素子をモ
ールド樹脂にて絶縁したものである。
[Means for Solving the Problems] A resin molded current transformer according to the present invention includes a ring-shaped thin plate having tension and having a diameter larger than the outer diameter of the transformation element, which is arranged in the direction of the outer diameter of the transformation element. At the same time, by wrapping the outer periphery of the metamorphic element and the thin plate with tape material, a void layer is formed between the metamorphic element and the thin plate, and the metamorphic element with this void layer is insulated with molded resin. This is what I did.

【0010】また、前記リング状薄板としてリング状磁
性板を用いてもよい。
Furthermore, a ring-shaped magnetic plate may be used as the ring-shaped thin plate.

【0011】[0011]

【作用】この発明における樹脂モールド形変流器では、
変成素子(2次巻線)の外周に張力のあるリング状薄板
とテープ材とにより、密閉構造の空隙層が緩衝層として
形成される。これにより、モールド樹脂の注形硬化時に
は、その硬化収縮が空隙層により確実に吸収され、鉄心
部への機械的ストレスが付与されることはない。
[Function] In the resin molded current transformer of this invention,
A gap layer with a sealed structure is formed as a buffer layer by a tensioned ring-shaped thin plate and tape material around the outer periphery of the transformation element (secondary winding). As a result, when the mold resin is cast and cured, the curing shrinkage is reliably absorbed by the void layer, and no mechanical stress is applied to the iron core.

【0012】また、リング状薄板としてリング状磁性板
を用いることにより、変流器に近接する電路等により生
じる磁界が変成素子の磁気回路に侵入するのを防止でき
る。
Furthermore, by using a ring-shaped magnetic plate as the ring-shaped thin plate, it is possible to prevent the magnetic field generated by the electric circuit or the like in the vicinity of the current transformer from penetrating into the magnetic circuit of the transformation element.

【0013】[0013]

【実施例】実施例1. 以下、この発明の一実施例を図について説明する。図1
,図2において、従来とほぼ同様に、1は磁気回路を構
成すべくリング状に設けられた鉄心(リング状鉄心部)
、3は鉄心1の外周に巻回されて外周絶縁を施すポリエ
ステルテープ等の絶縁テープで、この絶縁テープ3の外
周に2次巻線5を巻回することにより変成素子12が構
成されている。
[Example] Example 1. An embodiment of the present invention will be described below with reference to the drawings. Figure 1
, In FIG. 2, 1 denotes a ring-shaped iron core (ring-shaped iron core part) to constitute a magnetic circuit, almost as in the conventional case.
, 3 is an insulating tape such as a polyester tape that is wound around the outer periphery of the iron core 1 to insulate the outer periphery of the iron core 1. By winding a secondary winding 5 around the outer periphery of this insulating tape 3, a transformation element 12 is constructed. .

【0014】また、6は1次導体7および取付部品(図
示せず)と変成素子12とを絶縁するとともに筐体とな
るエポキシ樹脂モールド部、8は2次巻線5の両端に接
続されこの2次巻線5の出力をモールド部6の外部に導
き出すための2次端子である。
Further, 6 is an epoxy resin molded part which insulates the primary conductor 7 and mounting parts (not shown) from the transformation element 12 and also serves as a casing, and 8 is connected to both ends of the secondary winding 5. This is a secondary terminal for leading the output of the secondary winding 5 to the outside of the mold part 6.

【0015】そして、本実施例において、9は変成素子
12の外径方向に配設される張力の高い帯状プレスボー
ド(薄板)で、このプレスボード9は、変成素子12(
2次巻線5)の外径Bよりも大きな径Cのリング状にな
るようにその両端が固着されている。
In this embodiment, reference numeral 9 denotes a belt-shaped press board (thin plate) with high tension that is disposed in the outer diameter direction of the transformation element 12.
Both ends of the secondary winding 5) are fixed in a ring shape having a diameter C larger than the outer diameter B of the secondary winding 5).

【0016】ここで、寸法Cは、変成素子12の外周と
プレスボード9の内周との距離がエポキシ樹脂モールド
部6の硬化収縮寸法よりもわずかに大きくなるように設
定されている。
Here, the dimension C is set so that the distance between the outer periphery of the transformation element 12 and the inner periphery of the press board 9 is slightly larger than the curing shrinkage dimension of the epoxy resin molded part 6.

【0017】10は変成素子12(2次巻線5)とプレ
スボード9との外周に均一に巻き付けられた綿テープ(
テープ材)で、この綿テープ10の巻回により、変成素
子12とプレスボード9との間に空隙層11が緩衝層と
して形成され、この綿テープ10により、エポキシ樹脂
が空隙層11に浸透しないような密閉構造となっている
Reference numeral 10 denotes a cotton tape (
By winding this cotton tape 10, a void layer 11 is formed as a buffer layer between the conversion element 12 and the press board 9, and this cotton tape 10 prevents the epoxy resin from penetrating into the void layer 11. It has a closed structure.

【0018】そして、このような空隙層11を形成した
変成素子12の外周に、エポキシ樹脂を円環状に注形す
ることで、エポキシ樹脂モールド部6が形成される。
The epoxy resin molded portion 6 is then formed by casting epoxy resin in an annular shape around the outer periphery of the transformation element 12 in which the void layer 11 has been formed.

【0019】上述の構成により、変成素子12(2次巻
線5)の外周に張力のある帯状プレスボード9と綿テー
プ10とにより、密閉構造の空隙層11が、効果的な緩
衝層として形成される。これにより、エポキシ樹脂の注
形硬化時に生じる周方向αや半径方向βの硬化収縮が、
空隙層11により確実に吸収され、鉄心1への機械的ス
トレスが付与されることはない。
With the above-mentioned configuration, a gap layer 11 having a sealed structure is formed as an effective buffer layer by the tensioned band-shaped press board 9 and cotton tape 10 around the outer periphery of the transformation element 12 (secondary winding 5). be done. As a result, curing shrinkage in the circumferential direction α and radial direction β that occurs when epoxy resin is cast and cured is reduced.
It is reliably absorbed by the void layer 11, and no mechanical stress is applied to the iron core 1.

【0020】従って、従来のごとく、コルクシートを設
けることなく、大きな硬化収縮も吸収することができ、
コンパクトな構成で鉄心1への機械的ストレスの付与を
確実に防止できるほか、1次導体7に通電する電流を精
度よく2次巻線5に変換することが可能になる。
[0020] Therefore, large curing shrinkage can be absorbed without providing a cork sheet as in the conventional case.
The compact configuration not only reliably prevents mechanical stress from being applied to the iron core 1, but also allows the current flowing through the primary conductor 7 to be accurately converted to the secondary winding 5.

【0021】実施例2. なお、上記実施例では、リング状薄板として帯状プレス
ボード9を用いているが、これに代えて、図3,図4に
示すように、帯状電磁鋼板(リング状磁性板,リング状
薄板)9Aを使用してもよい。
Example 2. In the above embodiment, the band-shaped press board 9 is used as the ring-shaped thin plate, but instead of this, as shown in FIGS. 3 and 4, a band-shaped electromagnetic steel plate (ring-shaped magnetic plate, ring-shaped thin plate) 9A is used. may be used.

【0022】このように、リング状薄板として、磁気シ
ールド機能を有する帯状電磁鋼板9Aを使用することに
より、上記実施例と同様の効果が得られるほか、変流器
に近接する電路等からの外部磁気を、変成素子12から
遮蔽することができ、変流器の一次電流を精度よく変成
することができる効果も得られる。
As described above, by using the band-shaped electromagnetic steel sheet 9A having a magnetic shielding function as the ring-shaped thin plate, the same effects as in the above embodiment can be obtained, and in addition, the external Magnetism can be shielded from the transformation element 12, and the primary current of the current transformer can be transformed with high precision.

【0023】また、上記実施例では、空隙層11を形成
するためにテープ材として綿テープ10を用いているが
、これに代えて絶縁テープを用いても上記実施例と同様
の効果を奏する。
Further, in the above embodiment, the cotton tape 10 is used as the tape material to form the void layer 11, but even if an insulating tape is used instead, the same effect as in the above embodiment can be obtained.

【0024】[0024]

【発明の効果】以上詳述したように、本発明の樹脂モー
ルド形変流器によれば、変成素子の外周に張力のあるリ
ング状薄板とテープ材とにより、密閉構造の空隙層を緩
衝層として形成したので、モールド樹脂の注形硬化時に
はその硬化収縮を空隙層により確実に吸収でき、コンパ
クトな構成で鉄心への機械的ストレスの付与を確実に防
止でき、小形・軽量で精度のよいものが得られる効果が
ある。
As described in detail above, according to the resin molded current transformer of the present invention, the gap layer of the sealed structure can be changed into a buffer layer by using the tension ring-shaped thin plate and the tape material around the outer periphery of the transformation element. Since the mold resin is cast and cured, the curing shrinkage can be reliably absorbed by the void layer, and the compact structure reliably prevents mechanical stress from being applied to the iron core, making it compact, lightweight, and highly accurate. There is an effect that can be obtained.

【0025】また、リング状薄板としてリング状磁性板
を使用することにより、外部磁気が変成素子から遮蔽さ
れ、変流器の一次電流を精度よく変成できる効果もある
Furthermore, by using a ring-shaped magnetic plate as the ring-shaped thin plate, external magnetism is shielded from the transformation element, and the primary current of the current transformer can be transformed with high precision.

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

【図1】本発明の一実施例による樹脂モールド形変流器
を示す一部破断して示す正面図である。
FIG. 1 is a partially cutaway front view showing a resin molded current transformer according to an embodiment of the present invention.

【図2】図1のII−II断面図である。FIG. 2 is a sectional view taken along line II-II in FIG. 1;

【図3】本発明の他の実施例による樹脂モールド形変流
器を示す一部破断して示す正面図である。
FIG. 3 is a partially cutaway front view showing a resin molded current transformer according to another embodiment of the present invention.

【図4】図3のIV−IV断面図である。FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

【図5】従来の樹脂モールド形変流器を示す斜視図であ
る。
FIG. 5 is a perspective view showing a conventional resin molded current transformer.

【図6】従来の変流器を一部破断して示す正面図である
FIG. 6 is a partially cutaway front view of a conventional current transformer.

【図7】図6のVII−VII断面図である。FIG. 7 is a sectional view taken along line VII-VII in FIG. 6;

【符号の説明】[Explanation of symbols]

1  鉄心(リング状鉄心部) 5  2次巻線 6  エポキシ樹脂モールド部 7  1次導体 9  帯状プレスボード(リング状薄板)9A  帯状
電磁鋼板(リング状磁性板,リング状薄板)10  綿
テープ(テープ材) 11  空隙層 12  変成素子
1 Iron core (ring-shaped iron core part) 5 Secondary winding 6 Epoxy resin mold part 7 Primary conductor 9 Band-shaped press board (ring-shaped thin plate) 9A Band-shaped electromagnetic steel plate (ring-shaped magnetic plate, ring-shaped thin plate) 10 Cotton tape (tape material) 11 void layer 12 metamorphic element

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】  リング状鉄心部の外周に2次巻線を巻
回してなる変成素子と、該変成素子を貫通する1次導体
とを有し、前記変成素子をモールド樹脂により絶縁して
構成される樹脂モールド形変流器において、前記変成素
子の外径よりも大きな径をもつ張力のあるリング状薄板
が前記変成素子の外径方向に配設されるとともに、前記
の変成素子と薄板との外周をテープ材で巻回することに
より、前記の変成素子と薄板との間に空隙層が密閉形成
され、該空隙層を形成した前記変成素子がモールド樹脂
により絶縁されていることを特徴とする樹脂モールド形
変流器。
1. A transformer element comprising a secondary winding wound around the outer periphery of a ring-shaped iron core, and a primary conductor penetrating the transformer element, the transformer element being insulated by molded resin. In the resin molded current transformer, a tensile ring-shaped thin plate having a diameter larger than the outer diameter of the transformation element is disposed in the outer diameter direction of the transformation element, and the transformation element and the thin plate are connected to each other. By wrapping the outer periphery of the transformer with a tape material, a void layer is tightly formed between the transformer element and the thin plate, and the transformer element in which the void layer is formed is insulated by molded resin. Resin molded current transformer.
【請求項2】  前記リング状薄板としてリング状磁性
板が用いられていることを特徴とする請求項1記載の樹
脂モールド形変流器。
2. The resin mold type current transformer according to claim 1, wherein a ring-shaped magnetic plate is used as the ring-shaped thin plate.
JP3147216A 1990-10-22 1991-06-19 Resin mold type current transformer Expired - Fee Related JPH0782955B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3147216A JPH0782955B2 (en) 1990-10-22 1991-06-19 Resin mold type current transformer

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2-285447 1990-10-22
JP28544790 1990-10-22
JP3147216A JPH0782955B2 (en) 1990-10-22 1991-06-19 Resin mold type current transformer

Publications (2)

Publication Number Publication Date
JPH04242910A true JPH04242910A (en) 1992-08-31
JPH0782955B2 JPH0782955B2 (en) 1995-09-06

Family

ID=26477830

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3147216A Expired - Fee Related JPH0782955B2 (en) 1990-10-22 1991-06-19 Resin mold type current transformer

Country Status (1)

Country Link
JP (1) JPH0782955B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7529073B2 (en) 2002-03-14 2009-05-05 Ambient Corporation Protecting medium voltage inductive coupled device from electrical transients
CN110890200A (en) * 2019-11-05 2020-03-17 浙江永泰隆电子股份有限公司 Mutual inductor, packaging manufacturing method thereof and electric instrument thereof
US11037723B2 (en) 2017-05-08 2021-06-15 Delta Electronics, Inc. Transformer
US11250987B2 (en) * 2017-05-08 2022-02-15 Delta Electronics, Inc. Transformer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5448497A (en) * 1977-09-26 1979-04-17 Nippon Signal Co Ltd:The Identifying unit for object

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5448497A (en) * 1977-09-26 1979-04-17 Nippon Signal Co Ltd:The Identifying unit for object

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7529073B2 (en) 2002-03-14 2009-05-05 Ambient Corporation Protecting medium voltage inductive coupled device from electrical transients
US11037723B2 (en) 2017-05-08 2021-06-15 Delta Electronics, Inc. Transformer
US11250987B2 (en) * 2017-05-08 2022-02-15 Delta Electronics, Inc. Transformer
CN110890200A (en) * 2019-11-05 2020-03-17 浙江永泰隆电子股份有限公司 Mutual inductor, packaging manufacturing method thereof and electric instrument thereof

Also Published As

Publication number Publication date
JPH0782955B2 (en) 1995-09-06

Similar Documents

Publication Publication Date Title
US2948871A (en) Miniature inductive devices
JP2007142339A (en) Thunder resistance reinforcing type insulation transformer for low voltage
JPH04242910A (en) Resin-mold type current transformer
JPH0642433B2 (en) Stationary induction equipment
US3705372A (en) Cast-type winding structure for electrical inductive apparatus
JPS5857719A (en) Transformer
JPH10326711A (en) Inductance device
JPS5849010B2 (en) Wound core with gap
JPH08181022A (en) Transformer
JP7321119B2 (en) zero phase current transformer
JPH10270271A (en) Ignition transformer
JPS6020908Y2 (en) molded transformer
JPS622752Y2 (en)
JPH03286505A (en) Electromagnetic steel core
JPH0391210A (en) Transformer
JPS6314425Y2 (en)
JP2022158351A (en) Zero-phase current transformer
JPS5950205B2 (en) flyback transformer
JPS6082059A (en) Damper shield of superconductive generator
JPH07106164A (en) Neutral point reactor
JPH06260352A (en) Transformer
JPH05347221A (en) Core case
JPH03297110A (en) High-frequency transformer
JPH0236254Y2 (en)
JPH0334644B2 (en)

Legal Events

Date Code Title Description
FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080906

Year of fee payment: 13

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080906

Year of fee payment: 13

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090906

Year of fee payment: 14

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090906

Year of fee payment: 14

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100906

Year of fee payment: 15

LAPS Cancellation because of no payment of annual fees