JPH0334644B2 - - Google Patents
Info
- Publication number
- JPH0334644B2 JPH0334644B2 JP58002188A JP218883A JPH0334644B2 JP H0334644 B2 JPH0334644 B2 JP H0334644B2 JP 58002188 A JP58002188 A JP 58002188A JP 218883 A JP218883 A JP 218883A JP H0334644 B2 JPH0334644 B2 JP H0334644B2
- Authority
- JP
- Japan
- Prior art keywords
- ring
- insulating
- winding
- shield ring
- electric field
- 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.)
- Expired - Lifetime
Links
- 238000004804 winding Methods 0.000 claims description 22
- 239000011162 core material Substances 0.000 claims description 13
- 230000006698 induction Effects 0.000 claims description 7
- 230000005684 electric field Effects 0.000 description 12
- 239000007789 gas Substances 0.000 description 11
- 239000004020 conductor Substances 0.000 description 7
- 238000009413 insulation Methods 0.000 description 6
- 239000011810 insulating material Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000012212 insulator Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
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)
- Regulation Of General Use Transformers (AREA)
Description
【発明の詳細な説明】
本発明は静止誘導電器に係り、特に複合誘電体
の絶縁構成とするSF6ガス絶縁変圧器などの巻線
端部の電界集中を緩和するに好適な静電遮蔽用シ
ールドリングを備えた静止誘導電器に関する。
巻線の端部において、１ターンを形成せぬよう
リング状芯材に導電性材料を隅角部が適当な曲率
半径を成すよう巻回し、その上から絶縁材料でテ
ーピングしてリング状に形成した静電遮蔽用シー
ルドリングを配置し、巻線端部と同電位に接続す
ることにより、巻線端部での電界集中を緩和する
ことは公知である。しかしながらこのような従来
技術においては、静電遮蔽用シールドリングの隅
角部に絶縁筒などとの組合せによつて絶縁油ある
いはSF6ガスなどの液体又は気体絶縁物が固体絶
縁物によつて囲まれて微少空間すなわち油くさび
やガスくさびと呼ばれる部分が形成される。一般
に液体、気体絶縁物の誘電率は固体誘電体の1/2
〜1/4であり、特にSF6ガスのような場合は1/4程
度となるため、誘電率比による電界集中が大きく
なり、絶縁寸法を縮少する上で障害となつてい
た。
本発明の目的は巻線端部での過度の電界集中を
回避した静止誘導電器を提供することにある。
本発明は上記従来技術では静電遮蔽用シールド
リングの隅角部の面取り部分にくさび部分が生ず
ることが避けられない点に着目し、巻線端部に、
リング状芯材の隅角部を全周にわたつて面取りを
施し且つその外周に密着した導電層と絶縁層を備
えた静電遮蔽用シールドリングを配設すると共
に、該シールドリングの外周と鉄心継鉄部の間に
端部絶縁リングを設けてなる静止誘導電器におい
て、前記静電遮蔽用シールドリングの絶縁層部分
をモールド成形して前記端部絶縁リングと一体構
造に構成することにより静電遮蔽用シールドリン
グと巻線又は他の絶縁構造物との間に油くさび又
はガスくさびが形成されるのを回避したことを特
徴とするものである。
以下、本発明の実施例を図面に基づいて変圧器
を例により説明する。
第１図は従来例の一例を示し、同図において低
圧巻線７、高圧巻線６は鉄心脚９に同心配置さ
れ、絶縁筒２２と全周に複数個設けられた直線状
スペーサ１１，１７と共に組合せられている。低
圧巻線７、高圧巻線６の端部には静電遮蔽用シー
ルドリング（以下、単にシールドリングという。）
Ａが配置され、鉄心継鉄部８，１０の間にて端部
絶縁リング１５，１６，２０，２１を介在して支
持固定されている。以下、便宜上、高圧巻線６側
について説明する。シールドリングＡは高圧巻線
６の両端部に配置され、リング状の芯材１（又は
１３）の表面に導電性材料３が巻回され、さらに
絶縁材料２（又は１２）が所定の厚みとなるよう
巻回されている。導電性材料３は、鉄心脚９を通
る磁束と鎖交して１ターンを形成しないよう芯材
１（又は１３）の円周方向１ケ所にて非導通とな
るよう形成している。芯材１（又は１３）の隅角
部にはこのシールドリングＡの導電性材料３と端
部コイルが同電位接続されることにより電界が集
中するため、適当な曲率で面取りが施されてお
り、導電性材料３がこれに沿つて配置されること
により、その上に巻回された絶縁層２の表面電界
も緩和される。しかしながらこのシールドリング
Ａを巻線端部に装着し、高低圧巻線６，７を組合
せた場合、組合せに使用する直線スペーサ１１，
１７や端部絶縁リング２０，２１，１５，１６な
どとの接触部において第２図に示す如く、誘電率
の高い絶縁材料で誘電率の低い材料（即ち油やガ
ス）を包囲したいわゆるくさび部分１９が形成さ
れる。このくさび部分での高誘電率材料と低誘電
率材料の誘電率の比に応じた電界の集中を生じ、
特に第１図、第２図に示すようにこの隅角部は誘
電率が一様でも点線で示す等電位線の密度すなわ
ち電界が高いところであるので、部分放電を生じ
やすい。特にSF6ガスを含む低圧力の気体の場合
はここが放電開始することにより、即座に全面破
壊に至る様相を示すので絶縁上特に注意を払う必
要がある。従つて絶縁寸法を縮少するためには、
このような電界集中を生ずる個所をなくすように
する必要がある。
本発明の一実施例を第３図に示す。尚、第１図
の従来例と同一部材については同一の参照符号を
付してある。同図において芯材１，４，１３，１
４などの上に導電性材料２２，３０，３１，３２
を施すことは同一であるが、この外周には絶縁材
料で巻回する代わりに全体をモールド成形し、端
部絶縁を含めて一体化した絶縁リング２５，２
６，２７，２８を形成させている。
モールド成型は、エポキシレジン等を注入硬化
させる方法や、主絶縁媒体の油やガスの誘電率に
極力近い誘電率をもつた材料をパイプ状にして芯
材の回りに固着させる方法などが考えられるがい
ずれも他の絶縁材料との境界部にくさびを生じな
いような形状に成形することが容易である。
本実施例によれば、巻線端部のシールドリング
と端部絶縁リングを一体化し、かつ電界集中の最
も生じやすい油くさびやガスくさびをなくし、巻
線端部での過度の電界集中を回避することが可能
となるため、高低圧巻線間および巻線と上下継鉄
部間の絶縁距離を短縮することができ、中身寸
法、重量を20％程度低減することができるという
効果を有する。
以上に説明した如く本発明によれば静止誘導電
器において巻線端部での過度の電界集中を回避す
ることが可能となる。 DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a static induction electric device, and in particular to an electrostatic shielding device suitable for mitigating electric field concentration at the end of a winding, such as an SF 6 gas insulated transformer having a composite dielectric insulation structure. This invention relates to a stationary induction appliance equipped with a shield ring. At the end of the winding, conductive material is wound around a ring-shaped core material so that the corners have an appropriate radius of curvature so that no single turn is formed, and then an insulating material is taped on top to form a ring shape. It is known that electric field concentration at the end of the winding can be alleviated by arranging a shield ring for electrostatic shielding and connecting it to the same potential as the end of the winding. However, in such conventional technology, a liquid or gas insulator such as insulating oil or SF 6 gas is surrounded by a solid insulator at the corner of the electrostatic shielding shield ring in combination with an insulating tube. A microscopic space called an oil wedge or gas wedge is formed. In general, the dielectric constant of liquid and gas insulators is 1/2 that of solid dielectrics.
In particular, in the case of SF 6 gas, it is about 1/4, so electric field concentration due to the dielectric constant ratio increases, which has been an obstacle to reducing insulation dimensions. An object of the present invention is to provide a stationary induction electric appliance that avoids excessive electric field concentration at the winding ends. The present invention focuses on the fact that in the above-mentioned conventional technology, wedge portions are inevitably formed in the chamfered corners of the electrostatic shielding shield ring, and the present invention has been developed by
An electrostatic shielding shield ring is provided, in which the corners of the ring-shaped core material are chamfered all around, and a conductive layer and an insulating layer are closely attached to the outer periphery, and the outer periphery of the shield ring and the iron core are In a stationary induction appliance having an end insulating ring provided between the yoke parts, the insulating layer part of the electrostatic shielding shield ring is molded to form an integral structure with the end insulating ring, thereby reducing static electricity. It is characterized by avoiding the formation of oil or gas wedges between the shielding shield ring and the windings or other insulating structures. Embodiments of the present invention will be described below using a transformer as an example based on the drawings. FIG. 1 shows an example of a conventional example, in which a low-voltage winding 7 and a high-voltage winding 6 are arranged concentrically on a core leg 9, and an insulating cylinder 22 and a plurality of linear spacers 11, 17 are provided around the entire circumference. is combined with At the ends of the low-voltage winding 7 and the high-voltage winding 6 are electrostatic shielding shield rings (hereinafter simply referred to as shield rings).
A is arranged and supported and fixed between the core yoke parts 8 and 10 with end insulating rings 15, 16, 20, and 21 interposed therebetween. Hereinafter, for convenience, the high voltage winding 6 side will be explained. The shield ring A is arranged at both ends of the high-voltage winding 6, and a conductive material 3 is wound around the surface of a ring-shaped core material 1 (or 13), and an insulating material 2 (or 12) is further wound with a predetermined thickness. It is wound so that it looks like this. The conductive material 3 is formed to be non-conductive at one location in the circumferential direction of the core material 1 (or 13) so as not to interlink with the magnetic flux passing through the core legs 9 and form one turn. The corners of the core material 1 (or 13) are chamfered with an appropriate curvature because the electric field is concentrated when the conductive material 3 of this shield ring A and the end coil are connected at the same potential. By disposing the conductive material 3 along this, the surface electric field of the insulating layer 2 wound thereon is also relaxed. However , when this shield ring A is attached to the end of the winding and the high and low voltage windings 6 and 7 are combined, the linear spacer 11 used for the combination,
17 and end insulating rings 20, 21, 15, 16, etc., as shown in FIG. 19 is formed. An electric field is concentrated according to the ratio of the dielectric constants of the high-permittivity material and the low-permittivity material in this wedge part,
Particularly, as shown in FIGS. 1 and 2, even if the dielectric constant is uniform, this corner part is a place where the density of equipotential lines shown by dotted lines, that is, the electric field is high, so that partial discharge is likely to occur. In particular, in the case of low-pressure gases including SF 6 gas, if a discharge starts here, it will immediately lead to total destruction, so special care must be taken in terms of insulation. Therefore, in order to reduce the insulation dimensions,
It is necessary to eliminate locations where such electric field concentration occurs. An embodiment of the present invention is shown in FIG. Note that the same members as in the conventional example shown in FIG. 1 are given the same reference numerals. In the same figure, core materials 1, 4, 13, 1
Conductive material 22, 30, 31, 32 on top of 4 etc.
However, instead of being wrapped with an insulating material, the entire outer periphery is molded, and an insulating ring 25, 2 is integrated including the end insulation.
6, 27, and 28 are formed. Possible methods for molding include injecting and hardening epoxy resin, or forming a pipe into a material with a dielectric constant as close as possible to that of the main insulating medium, such as oil or gas, and fixing it around the core material. However, it is easy to mold the material into a shape that does not create a wedge at the boundary with other insulating materials. According to this embodiment, the shield ring at the winding end and the end insulating ring are integrated, and the oil wedge and gas wedge that are most likely to cause electric field concentration are eliminated, thereby avoiding excessive electric field concentration at the winding end. As a result, the insulation distance between the high and low voltage windings and between the windings and the upper and lower yoke parts can be shortened, and the internal dimensions and weight can be reduced by about 20%. As explained above, according to the present invention, it is possible to avoid excessive electric field concentration at the end of the winding in a stationary induction electric appliance.
第１図は従来の変圧器の構成を示す縦断面図、
第２図は第１図に示した変圧器のくさび部を示す
Ｂ部拡大縦断面図、第３図は本発明の一実施例を
示す変圧器の縦断面図である。
Ａ……静電シードリング、１，４，１３，１４
……芯材、２２，３０，３１，３２……導電材
料、２５，２６，２７，２８……モールド絶縁リ
ング、６……高圧巻線、７……低圧巻線。
Figure 1 is a vertical cross-sectional view showing the configuration of a conventional transformer.
FIG. 2 is an enlarged vertical cross-sectional view of part B showing the wedge portion of the transformer shown in FIG. 1, and FIG. 3 is a vertical cross-sectional view of the transformer showing an embodiment of the present invention. A ... Electrostatic seeding, 1, 4, 13, 14
... core material, 22, 30, 31, 32 ... conductive material, 25, 26, 27, 28 ... mold insulating ring, 6 ... high voltage winding, 7 ... low voltage winding.
Claims (1)
わたつて面取りを施し且つその外周に密着した導
電層と絶縁層を備えた静電遮蔽用シールドリング
を配設すると共に、該シールドリングの外周と鉄
心継鉄部の間に端部絶縁リングを設けてなる静止
誘導電器において、前記静電遮蔽用シールドリン
グの絶縁層部分をモールド成形して前記端部絶縁
リングと一体構造にしたことを特徴とする静止誘
導電器。1. At the end of the winding, an electrostatic shielding shield ring is provided in which the corners of the ring-shaped core material are chamfered over the entire circumference and a conductive layer and an insulating layer are closely attached to the outer circumference, and In a stationary induction electric appliance in which an end insulating ring is provided between the outer periphery of the shield ring and the core yoke, the insulating layer portion of the electrostatic shielding shield ring is molded to form an integral structure with the end insulating ring. A stationary induction electric appliance characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58002188A JPS59127819A (en) | 1983-01-12 | 1983-01-12 | Stationary induction apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58002188A JPS59127819A (en) | 1983-01-12 | 1983-01-12 | Stationary induction apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59127819A JPS59127819A (en) | 1984-07-23 |
| JPH0334644B2 true JPH0334644B2 (en) | 1991-05-23 |
Family
ID=11522382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58002188A Granted JPS59127819A (en) | 1983-01-12 | 1983-01-12 | Stationary induction apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59127819A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04348508A (en) * | 1991-05-27 | 1992-12-03 | Toshiba Corp | Static induction electric device |
| TR201004047A2 (en) * | 2010-05-21 | 2010-08-23 | Den�Zo�Lu Cemalett�N | Shielding method to reduce external magnetic effects in low power current transformers. |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5838580Y2 (en) * | 1977-09-26 | 1983-09-01 | 株式会社ダイヘン | induction electric appliances |
| JPS54109030U (en) * | 1978-01-20 | 1979-08-01 |
-
1983
- 1983-01-12 JP JP58002188A patent/JPS59127819A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59127819A (en) | 1984-07-23 |
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