JP2018032717A - Stationary induction apparatus - Google Patents

Stationary induction apparatus Download PDF

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JP2018032717A
JP2018032717A JP2016163607A JP2016163607A JP2018032717A JP 2018032717 A JP2018032717 A JP 2018032717A JP 2016163607 A JP2016163607 A JP 2016163607A JP 2016163607 A JP2016163607 A JP 2016163607A JP 2018032717 A JP2018032717 A JP 2018032717A
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shield
coil
iron core
stationary induction
induction device
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JP7169738B2 (en
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裕介 ▲陦▼
裕介 ▲陦▼
Yuusuke Shima
塩田　広
Hiroshi Shioda
広 塩田
哲夫 中前
Tetsuo Nakamae
哲夫 中前
公治 大山
Kimiharu Oyama
公治 大山
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Toshiba Industrial Products and Systems Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a stationary induction apparatus capable of facilitating optimum design for the insulation of each portion.SOLUTION: The stationary induction apparatus includes: an iron core; a coil fitted onto an outer periphery of the iron core; and a conductive or semiconductive shield disposed to face the coil on both ends of the coil in the axial direction. The coil is connected with a power supply potential and at least the iron core and the shield are connected with a ground potential.SELECTED DRAWING: Figure 5

Description

本発明の実施形態は、静止誘導機器に関する。   Embodiments described herein relate generally to a stationary guidance device.

近年、静止誘導機器として、高電圧に用いられる変圧器の小型軽量化を進める際に、精密な三次元解析により各部位の局部電界を求め、その局部電界を許容値以下とすることで最適な絶縁となるように設計する設計手法が採用されている。   In recent years, as a static induction device, when a transformer used for high voltage is reduced in size and weight, the local electric field of each part is obtained by precise three-dimensional analysis, and it is optimal to keep the local electric field below the allowable value. A design method for designing insulation is employed.

この電界を最適化するためには変圧器の鉄心やその締め付け金具の形状あるいはコイルの形状など、様々な部位で工夫する必要がある。   In order to optimize this electric field, it is necessary to devise various parts such as the shape of the iron core of the transformer, its fastening metal fitting, or the shape of the coil.

特開平９−３１２２２２号公報JP-A-9-31222 特開２０１２−０２８６４２号公報JP2012-028642A

特に、大地電位となる鉄心やその締め付け金具は形状が複雑なことから、個々の設計において各部位の絶縁を最適設計するには多大な手間と時間を要していた。
実施形態は、各部位の絶縁の最適設計を容易化できる静止誘導機器を提供する。 In particular, since the iron core and the fastening metal fittings that are ground potentials have complicated shapes, it takes a lot of time and effort to optimally design the insulation of each part in each design.
The embodiment provides a stationary induction device that can facilitate the optimal design of the insulation of each part.

実施形態に係る静止誘導機器は、鉄心と、前記鉄心の外周に装着されたコイルと、前記コイルの軸方向両端に前記コイルに対向して配設された導電性若しくは半導電性のシールドと、を備える。前記コイルは電源電位に接続され、少なくとも前記鉄心及び前記シールドは大地電位に接続される。   The stationary induction device according to the embodiment includes an iron core, a coil mounted on the outer periphery of the iron core, and a conductive or semiconductive shield disposed on both ends in the axial direction of the coil so as to face the coil. Is provided. The coil is connected to a power supply potential, and at least the iron core and the shield are connected to a ground potential.

実施形態に係る変圧器の概略構成例を示す上面図Top view showing a schematic configuration example of a transformer according to an embodiment 実施形態に係る変圧器の概略構成例を示す正面図Front view showing a schematic configuration example of a transformer according to an embodiment 実施形態に係る変圧器の概略構成例を示す側面図Side view showing a schematic configuration example of a transformer according to an embodiment シールドの構成を模式的に示す図であり、（ａ）は上面図、（ｂ）は（ａ）のＡ−Ａ線における縦断面図It is a figure which shows the structure of a shield typically, (a) is a top view, (b) is a longitudinal cross-sectional view in the AA line of (a). コイルの上端部を拡大して示す斜視図The perspective view which expands and shows the upper end part of a coil

以下、実施形態について図面に基づいて説明する。実施形態の説明において実質的に同一の構成部位には同一の符号を付し、説明を省略する。
図１から図３は、実施形態に係る静止誘導機器の一例として変圧器１の概略構成例を示す図である。図１は上面図、図２は正面図、図３は側面図を示している。図４はシールド１０の構成を模式的に示す図であり、（ａ）は上面図、（ｂ）は（ａ）のＡ−Ａ線における縦断面図である。図５は、コイル１８の上端部を拡大して示す斜視図である。 Hereinafter, embodiments will be described with reference to the drawings. In the description of the embodiment, substantially the same components are denoted by the same reference numerals, and description thereof is omitted.
1 to 3 are diagrams illustrating a schematic configuration example of a transformer 1 as an example of a stationary induction device according to the embodiment. 1 is a top view, FIG. 2 is a front view, and FIG. 3 is a side view. 4A and 4B are diagrams schematically showing the configuration of the shield 10, wherein FIG. 4A is a top view and FIG. 4B is a longitudinal sectional view taken along line AA in FIG. FIG. 5 is an enlarged perspective view showing the upper end portion of the coil 18.

図に示すように、変圧器１は、鉄心１２と、鉄心１２の外周に巻回されて装着されるコイル１８とを備えている。鉄心１２は上部に上ヨーク１２ａ、下部に下ヨーク１２ｂを備えており、上ヨーク１２ａ及び下ヨーク１２ｂ部においてクランプ１４によって挟持固定されている。クランプ１４は、例えば珪素鋼板を材料とした複数の金属薄板を積層してなる鉄心１２を締付固定する締付金具として機能する。   As shown in the figure, the transformer 1 includes an iron core 12 and a coil 18 wound around the outer periphery of the iron core 12 and attached. The iron core 12 includes an upper yoke 12a at the upper part and a lower yoke 12b at the lower part, and is clamped and fixed by clamps 14 at the upper yoke 12a and the lower yoke 12b. The clamp 14 functions as a fastening bracket for fastening and fixing the iron core 12 formed by laminating a plurality of thin metal plates made of, for example, a silicon steel plate.

コイル１８は上下からコイル押え１６により固定されている。コイル１８の上端部にはコイル１８に接続する口出し線１８ａが設けられている。コイル押え１６は絶縁物により構成されている。下方のクランプ１４は台座２０に螺設固定され、これにより変圧器１が台座２０に固定される。鉄心１２は大地電位に接続されている。また、クランプ１４も大地電位に接続されている。このように構成された変圧器１は、絶縁油や絶縁ガスなどの絶縁冷却媒体が充填された図示しないタンク内に収納されている。   The coil 18 is fixed by a coil presser 16 from above and below. A lead wire 18 a connected to the coil 18 is provided at the upper end portion of the coil 18. The coil retainer 16 is made of an insulating material. The lower clamp 14 is screwed and fixed to the pedestal 20, whereby the transformer 1 is fixed to the pedestal 20. The iron core 12 is connected to the ground potential. The clamp 14 is also connected to the ground potential. The transformer 1 configured as described above is housed in a tank (not shown) filled with an insulating cooling medium such as insulating oil or insulating gas.

コイル１８は電源電位に接続されている。そのため、大地電位に接続された鉄心１２とコイル１８との間で高電界が構成されている。また、シールド１０は大地電位に接続されたクランプ１４に電気的に接続されているため大地電位に接続されており、電源電位に接続された鉄心１２とシールド１０との間で高電界を構成している。   The coil 18 is connected to the power supply potential. Therefore, a high electric field is formed between the iron core 12 and the coil 18 connected to the ground potential. Further, since the shield 10 is electrically connected to the clamp 14 connected to the ground potential, it is connected to the ground potential, and a high electric field is formed between the iron core 12 connected to the power supply potential and the shield 10. ing.

シールド１０は、図４（ａ）及び（ｂ）に示すように、平板リング形状に切り欠け部１０ｃを設けた薄板により構成されており、全体として略円盤形状又は馬蹄形を呈している。切り欠け部１０ｃは、シールド１０と口出し線１８ａとの絶縁距離を確保するために設けられている。シールド１０は、例えばエポキシ樹脂からなる絶縁物を基体１０ａとし、当該基体１０ａの表面に、導電性塗料、又は半導電性塗料を塗布してなる表層部１０ｂにより表面をコーティングされた構成を備えている。導電性塗料としては、例えば導電性カーボンペーストなどを用いることができる。表層部１０ｂが導電性を備えることによりシールド１０は全体として導電性又は半導電性となっている。   As shown in FIGS. 4 (a) and 4 (b), the shield 10 is formed of a thin plate having a flat ring shape provided with a notch 10c, and has a substantially disc shape or a horseshoe shape as a whole. The notch 10c is provided in order to ensure an insulation distance between the shield 10 and the lead wire 18a. The shield 10 has a configuration in which an insulator made of, for example, an epoxy resin is used as a base 10a, and the surface of the base 10a is coated with a surface layer portion 10b formed by applying a conductive paint or a semiconductive paint. Yes. As the conductive paint, for example, a conductive carbon paste can be used. By providing the surface layer portion 10b with conductivity, the shield 10 as a whole is conductive or semiconductive.

表層部１０ｂは導電性塗料、又は半導電性塗料を塗布して形成されているため、膜厚が薄く形成されている。変圧器１の運転時にシールド１０には渦電流が誘起されるが、渦電流損は導電物厚さの２乗に比例するため、上述のように膜厚が薄く形成された導電部すなわち表層部１０ｂによって、渦電流損を低減することができる。また、渦電流損は導電物の抵抗率に反比例するため、表層部１０ｂの抵抗率を高く調整することによっても渦電流を低減できる。   Since the surface layer portion 10b is formed by applying a conductive paint or a semiconductive paint, the film thickness is thin. An eddy current is induced in the shield 10 during the operation of the transformer 1, but since the eddy current loss is proportional to the square of the thickness of the conductive material, the conductive portion formed as a thin film as described above, that is, the surface layer portion. The eddy current loss can be reduced by 10b. Moreover, since the eddy current loss is inversely proportional to the resistivity of the conductive material, the eddy current can be reduced by adjusting the resistivity of the surface layer portion 10b to be high.

また、表層部１０ｂは、端部１０ｄにおいて、導電性塗料の塗布時に塗布液の表面張力によって丸く曲率を呈する形状となる。これが硬化すると、シールド１０の端部１０ｄは丸い曲率部１０ｅを備えるように構成され、角部が形成されないように構成される。また、シールド１０はその表面が所定の平坦度となるような平面となるように構成されており、凹凸が形成されていない。所定の平坦度は、コイル１８との間で許容される電界強度に応じて適宜調整される。   Moreover, the surface layer part 10b becomes a shape which exhibits a curvature roundly by the surface tension of a coating liquid at the time of application | coating of a conductive paint in the edge part 10d. When this is cured, the end portion 10d of the shield 10 is configured to include a round curvature portion 10e, and is configured not to form a corner portion. Further, the shield 10 is configured to have a flat surface with a predetermined flatness, and no irregularities are formed. The predetermined flatness is appropriately adjusted according to the electric field strength allowed between the coil 18 and the coil 18.

コイル１８の軸方向の両端、すなわち図においてコイル１８の上下方向の両端にシールド１０が配置されている。シールド１０はクランプ１４に固定されており、これにより電気的にクランプ１４に接続されている。シールド１０はクランプ１４に電気的に接続されているため、シールド１０も大地電位に接続されている。   The shields 10 are disposed at both ends of the coil 18 in the axial direction, that is, at both ends in the vertical direction of the coil 18 in the drawing. The shield 10 is fixed to the clamp 14 and is thereby electrically connected to the clamp 14. Since the shield 10 is electrically connected to the clamp 14, the shield 10 is also connected to the ground potential.

シールド１０はコイル１８に対向するように配設されている。これにより、シールド１０はコイル１８が変圧器１の他の部位に対向しないように遮蔽する。シールド１０の外径をコイル１８の外径よりも更に大きく構成すれば、シールド１０によりコイル１８を遮蔽する範囲を更に大きくすることができる。但し、変圧器１の他の部位がコイル１８から十分離れていたり、角を丸くしたりするなどの処理が施されて、シールド１０表面のどの部位よりも局所電位が低くなるように配設されていれば、コイル１８に対向する部位が存在していてもよい。シールド１０とコイル１８との距離は、シールド１０−コイル１８間に生じる電界強度に応じて調整される。このようにして、シールド１０は、シールド１０−コイル１８間に生じる電界強度が、シールド１０以外の部位よりも大きく、かつ、許容値以下となるように調整が施される。   The shield 10 is disposed so as to face the coil 18. As a result, the shield 10 shields the coil 18 from facing the other parts of the transformer 1. If the outer diameter of the shield 10 is made larger than the outer diameter of the coil 18, the range in which the coil 18 is shielded by the shield 10 can be further increased. However, the other parts of the transformer 1 are sufficiently separated from the coil 18 and rounded corners are applied so that the local potential is lower than any part on the surface of the shield 10. As long as it exists, the site | part which opposes the coil 18 may exist. The distance between the shield 10 and the coil 18 is adjusted according to the electric field strength generated between the shield 10 and the coil 18. In this way, the shield 10 is adjusted so that the electric field strength generated between the shield 10 and the coil 18 is larger than the portion other than the shield 10 and is equal to or less than the allowable value.

次に、以上のように構成された変圧器１の作用効果について説明する。
上述のように、変圧器１のコイル１８は高電位である電源電位に接続されている。一方、鉄心１２、クランプ１４、シールド１０は大地電位に接続されている。従って、コイル１８と、鉄心１２、クランプ１４及びシールド１０との間には高電圧が印加された状態となっており、高電界が発生している。ここで、シールド１０は、コイル１８に対向するように配置されており、コイル１８がその他の部位に実質的に対向しないように遮蔽している。シールド１０の外径を更に大きくすれば、この遮蔽効果を更に大きくすることができる。 Next, the function and effect of the transformer 1 configured as described above will be described.
As described above, the coil 18 of the transformer 1 is connected to a power supply potential that is a high potential. On the other hand, the iron core 12, the clamp 14, and the shield 10 are connected to the ground potential. Therefore, a high voltage is applied between the coil 18, the iron core 12, the clamp 14, and the shield 10, and a high electric field is generated. Here, the shield 10 is disposed so as to face the coil 18 and shields the coil 18 so as not to substantially face other portions. If the outer diameter of the shield 10 is further increased, this shielding effect can be further increased.

この構成によれば、コイル１８と、コイル１８以外の部位の間で高電界を構成する部材はシールド１０のみとなる。このように構成すれば、変圧器１において、コイル１８と局部電界が最大となる箇所は少なくともシールド１０に存在することになるため、コイル１８と他の部材との電界緩和は、シールド１０についてのみ考慮すればよいことになる。これによって、変圧器１において、コイル１８と他の部位との間の最適な絶縁の設計を容易化できる。   According to this configuration, the shield 10 is the only member that forms a high electric field between the coil 18 and a portion other than the coil 18. If comprised in this way, in the transformer 1, since the location where the coil 18 and a local electric field become the maximum will exist in the shield 10, the electric field relaxation of the coil 18 and another member is only about the shield 10. This should be taken into consideration. Thereby, in the transformer 1, the optimal insulation design between the coil 18 and other parts can be facilitated.

また、上述のように、シールド１０は、端部１０ｄにおいて表層部１０ｂが丸い曲率部１０ｅを備えるように構成され、角部が形成されないようにされている。これによって、端部１０ｄにおける電界集中が緩和される。また、シールド１０はその表面が所定の平坦度以下となるような平面に構成されており、凹凸が許容値以下となっているため、局所的な電界集中が回避される。このように、シールド１０において局部的に強電界となる箇所がなく、電界集中の緩和が施されており、変圧器１全体で、コイル１８とこれに対向する部位との間の電界強度が許容値以下となっている。このような構成では、シールド１０に必要な電界緩和の処置を施せば、変圧器１全体としての電界緩和対策が施されたことになる。従って、シールド１０に関してのみ電界緩和を考慮すれば良いため変圧器１の設計が容易になる。以上に説明したように、実施形態によれば、最適な絶縁の設計を容易化でき、これにより静止誘導機器の長期信頼性を確保することが可能となる。   Further, as described above, the shield 10 is configured such that the surface layer portion 10b includes the round curvature portion 10e at the end portion 10d, and the corner portion is not formed. Thereby, the electric field concentration at the end 10d is alleviated. Further, the shield 10 is configured to have a flat surface with a surface having a predetermined flatness or less, and the unevenness is less than the allowable value, so that local electric field concentration is avoided. As described above, there is no portion where the strong electric field is locally generated in the shield 10, and the electric field concentration is alleviated, and the electric field strength between the coil 18 and the portion facing this is allowed in the entire transformer 1. It is below the value. In such a configuration, if the necessary electric field relaxation treatment is applied to the shield 10, the electric field relaxation measures for the entire transformer 1 are taken. Therefore, since the electric field relaxation needs to be considered only for the shield 10, the design of the transformer 1 is facilitated. As described above, according to the embodiment, the optimum insulation design can be facilitated, thereby ensuring the long-term reliability of the stationary induction device.

その他の変形例として、図４に示すシールド１０の基体１０ａを導電性材料により構成し、当該基体１０ａの表面に、絶縁性材料を塗布してなる表層部１０ｂ、若しくは、絶縁性材料により構成された例えば絶縁性テープを巻回してなる表層部１０ｂを設けた構成にしても良い。基体１０ａが導電性を備えることにより、シールド１０は全体として導電性となっている。その他の構成は上述した実施形態と同様である。変形例の静止誘導機器１によれば実施形態と同様の効果を奏する。   As another modification, the base 10a of the shield 10 shown in FIG. 4 is made of a conductive material, and the surface 10b is formed by applying an insulating material to the surface of the base 10a, or is made of an insulating material. For example, a configuration in which a surface layer portion 10b formed by winding an insulating tape may be provided. Since the base body 10a is conductive, the shield 10 is conductive as a whole. Other configurations are the same as those of the above-described embodiment. According to the stationary induction device 1 of the modified example, the same effects as in the embodiment can be obtained.

本発明のいくつかの実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら新規な実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。   Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

例えば、上記実施形態は三相変圧器を例示して説明したがこれに限られない。例えば、単相変圧器であってもよい。また、静止誘導機器として、変圧器を例示して説明したがこれに限られず、例えばリアクトルに適用しても良い。   For example, although the said embodiment illustrated and demonstrated the three-phase transformer, it is not restricted to this. For example, a single phase transformer may be used. Moreover, although the transformer was illustrated and demonstrated as a static induction apparatus, it is not restricted to this, For example, you may apply to a reactor.

図面中、１は変圧器、１０はシールド、１０ａは基体、１０ｂは表層部、１０ｄは端部、１０ｃは切り欠け部、１２は鉄心、１４はクランプ、１８はコイルを示す。   In the drawings, 1 is a transformer, 10 is a shield, 10a is a base, 10b is a surface layer portion, 10d is an end portion, 10c is a notch portion, 12 is an iron core, 14 is a clamp, and 18 is a coil.

Claims (9)

鉄心と、
前記鉄心の外周に装着されたコイルと、
前記コイルの軸方向両端に前記コイルに対向して配設された導電性若しくは半導電性のシールドと、を備え、
前記コイルは電源電位に接続され、少なくとも前記鉄心及び前記シールドは大地電位に接続される静止誘導機器。 Iron core,
A coil mounted on the outer periphery of the iron core;
A conductive or semiconductive shield disposed opposite to the coil at both axial ends of the coil;
The coil is connected to a power supply potential, and at least the iron core and the shield are stationary induction devices connected to a ground potential. 前記コイルと、前記コイル以外の部位との間の局部電界が最大となる箇所は、前記シールドに存在するように構成された請求項１に記載の静止誘導機器。   The stationary induction device according to claim 1, wherein a portion where a local electric field between the coil and a portion other than the coil is maximized is present in the shield. 前記シールドは、絶縁材料により構成された基体と、前記基体の表面に設けられた導電材料からなる表層部と、により構成されている請求項１又は２に記載の静止誘導機器。   The stationary induction device according to claim 1, wherein the shield is configured by a base body made of an insulating material and a surface layer portion made of a conductive material provided on a surface of the base body. 前記シールドの基体はエポキシ樹脂からなる請求項３に記載の静止誘導機器。   The stationary induction device according to claim 3, wherein the base of the shield is made of an epoxy resin. 前記表層部は、塗布された導電性塗料又は半導電性塗料により構成される請求項３に記載の静止誘導機器。   The static induction device according to claim 3, wherein the surface layer portion is configured by an applied conductive paint or semiconductive paint. 前記シールドは、導電性材料により構成された基体と、前記基体の表面に設けられた絶縁材料からなる表層部と、により構成されている請求項１又は２に記載の静止誘導機器。   3. The stationary induction device according to claim 1, wherein the shield includes a base made of a conductive material and a surface layer portion made of an insulating material provided on a surface of the base. 前記表層部は、塗布又は巻回された絶縁性材料により構成される請求項６に記載の静止誘導機器。   The said surface layer part is a stationary induction | guidance | derivation apparatus of Claim 6 comprised by the insulating material apply | coated or wound. 前記シールドは、切り欠け部を備えた略円盤形状の薄板である請求項１から７のいずれか一項に記載の静止誘導機器。   The stationary guide device according to any one of claims 1 to 7, wherein the shield is a substantially disk-shaped thin plate having a notch portion. 更に前記鉄心を締付固定する締付金具を備えており、
前記締付金具は大地電位に接続され、前記シールドは、前記締付金具に電気的に接続される請求項１から８のいずれか一項に記載の静止誘導機器。
Furthermore, it has a fastening bracket for fastening and fixing the iron core,
The stationary induction device according to any one of claims 1 to 8, wherein the clamp is connected to a ground potential, and the shield is electrically connected to the clamp.
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