JPS5885510A - Transformer - Google Patents
TransformerInfo
- Publication number
- JPS5885510A JPS5885510A JP56184215A JP18421581A JPS5885510A JP S5885510 A JPS5885510 A JP S5885510A JP 56184215 A JP56184215 A JP 56184215A JP 18421581 A JP18421581 A JP 18421581A JP S5885510 A JPS5885510 A JP S5885510A
- Authority
- JP
- Japan
- Prior art keywords
- winding
- windings
- lower ends
- current density
- voltage
- 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
Links
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
- H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
- Regulation Of General Use Transformers (AREA)
Abstract
Description
【発明の詳細な説明】
発明の杖ρ野
本発明は金属シートと絶縁シートを重ねて巻いた補巻巻
線からなる低圧巻線および高圧巻線を備えた変圧器に関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transformer equipped with a low-voltage winding and a high-voltage winding comprising an auxiliary winding in which a metal sheet and an insulating sheet are wound in layers.
発明の技術的背景
この種の箔巻巻線を備えた変圧器は占精率が良いので小
形、軽量化を実現できる利点がある。すでに数kV、数
100 kVA程度の比較的電圧の低い小容量の変圧器
では実用化され、かなシ市場に出回っている。Technical Background of the Invention A transformer equipped with this type of foil-wound winding has a good fertilization rate, so it has the advantage of being able to be made smaller and lighter. Small-capacity transformers with relatively low voltages of several kV or several hundred kVA have already been put into practical use and are on the Kanashi market.
最近に至りその優れた長所に鑑み、より高電圧、大容量
の例えば275kV、300MVA変圧器に適用拡大が
研究されているが、箔巻変圧器の最大の欠点である巻線
上下端部に流れる大きな渦電流による巻線端部の温度上
昇過大の問題をいかに克服するかが大容量箔巻線変圧器
を実用化する上で最大の鍵である。Recently, in view of its excellent advantages, research has been conducted to expand its application to higher voltage, larger capacity transformers such as 275kV and 300MVA.However, the biggest drawback of foil-wound transformers is that large The key to putting large capacity foil-wound transformers into practical use is how to overcome the problem of excessive temperature rise at the ends of the windings due to eddy currents.
従来の箔巻変圧器は第1図で示す構成をなしている。絶
縁媒体として絶縁油またid’sF、ガスなどの絶縁ガ
スを封入したタンク1の内部に鉄心2が設けられ、この
鉄心2の脚部の外側周囲に絶縁筒3を介して低圧巻線4
が巻装され、この低圧巻線4の外側周囲に絶縁バリヤ6
を介して高圧巻線5が巻装されている。これら各巻線4
.5はアルミニウムなどからなる金属シート7と樹脂フ
ィルムなどからなる絶縁シート8とを重ね合わせて巻い
た箔巻巻線で構成されている。各巻線4.5の上下端部
の上側および下側には鉄心2と各巻線4.5とを締付け
るためのクランプ9,9が配置されている。タンク1の
壁部内側には巻線4,5からの漏れ磁束によυタンク1
壁部が過熱することを防止するタンクシールド10が取
付けである。A conventional foil-wound transformer has the configuration shown in FIG. An iron core 2 is provided inside a tank 1 filled with an insulating gas such as insulating oil or id'sF gas as an insulating medium, and a low voltage winding 4 is connected to the outer circumference of the legs of the iron core 2 via an insulating cylinder 3.
is wound around the outer circumference of this low voltage winding 4, and an insulating barrier 6 is placed around the outer circumference of this low voltage winding 4.
A high voltage winding 5 is wound through the coil. Each of these windings 4
.. 5 is constituted by a foil-wound wire formed by overlapping and winding a metal sheet 7 made of aluminum or the like and an insulating sheet 8 made of resin film or the like. Clamps 9, 9 for tightening the iron core 2 and each winding 4.5 are arranged above and below the upper and lower ends of each winding 4.5. Due to leakage magnetic flux from windings 4 and 5, υtank 1 is inside the wall of tank 1.
A tank shield 10 is installed which prevents the walls from overheating.
背景技術の問題点
一般の変圧器は平角銅線を巻回した低圧および高圧巻線
を使用しているために、巻線に負荷電流が流れると、第
1図の破線で示すような巻線漏れ磁束が発生するが、箔
巻巻線からなる低圧および高圧巻線4.5を備えた変圧
器においては、巻線4,5に負荷電流が流れると漏れ磁
束の水平方向成分を打消すように巻線4,5の上下端部
に大きなループの渦電流が流れる。この結果、箔巻変圧
器の巻線漏れ磁束は第1図2点鎖線で示すように、巻線
4,5の内部では垂直に通シ、巻線4,5から出た直後
に略直角に曲がるような通り方をする。この時、各巻線
4゜5の上下端部には負荷電流に大きな渦電流が重畳し
て流れるために、巻線4,5の上下端部の電流密度はこ
の上下端部を除く巻線4,5の中間部の電流密度に比し
て極端に高くなる。この巻線4,5端部における電流密
度分布の特性を第2図に示す。この線図によれば巻線4
の端部では電流密度が外周部から内周部に向けて高くな
、D(A線)、巻線5の端部では電流密度が内周部から
外周部に向けて高く々る(B線)傾向にあることが判る
。このように巻線4.5の端部における電流密度が過大
となる結果、巻線4゜5の上下端部のみが異常に高い温
度となる。Problems with the Background Art Conventional transformers use low-voltage and high-voltage windings made of rectangular copper wire, so when a load current flows through the windings, the windings as shown by the broken line in Figure 1 Leakage flux occurs, but in a transformer with low-voltage and high-voltage windings 4.5 made of foil-wound windings, when load current flows through windings 4 and 5, the horizontal component of leakage flux is canceled out. A large loop of eddy current flows through the upper and lower ends of the windings 4 and 5. As a result, as shown by the two-dot chain line in Figure 1, the winding leakage flux of the foil-wound transformer passes vertically inside the windings 4 and 5, and straightens at a nearly right angle immediately after exiting the windings 4 and 5. Walk in a curving manner. At this time, since a large eddy current flows superimposed on the load current at the upper and lower ends of each winding 4.5, the current density at the upper and lower ends of the windings 4 and 5 is lower than that of the winding 4 excluding the upper and lower ends. , 5 is extremely high compared to the current density in the middle part. The characteristics of the current density distribution at the ends of the windings 4 and 5 are shown in FIG. According to this diagram, winding 4
At the end of the winding 5, the current density increases from the outer circumference to the inner circumference, D (line A), and at the end of the winding 5, the current density increases from the inner circumference to the outer circumference (line B). ) It can be seen that there is a tendency. As a result of the excessive current density at the ends of the winding 4.5, only the upper and lower ends of the winding 4.5 have an abnormally high temperature.
この現象に対する対策として、巻線4.5における導体
である金属シート7の厚さを増して巻線端部の電流密度
を温度上昇が問題にならないレベルにまで下げれば良い
。しかし巻184゜5の巻厚を巻線高さ方向(巻線軸方
向)に一様になるように巻き上げるには巻線端部を除く
渦電流の影響がない巻線全高さの約90%以上を占める
巻線中間部分の金属シート7の厚さも一様に増す必要が
ある。このために金属シート7全体の厚さが増大して、
占積率が良いという箔巻巻線の最大の特長が失なわれて
し甘う。また、金属シート7の厚さが一様になるために
、巻線端部の冷却を巻線中間部に比して格段に良くする
冷却構造の採用も実現が難しいという問題がある。As a countermeasure against this phenomenon, the thickness of the metal sheet 7, which is a conductor in the winding 4.5, may be increased to reduce the current density at the end of the winding to a level where the temperature rise does not become a problem. However, in order to wind the 184°5 winding so that the thickness is uniform in the winding height direction (winding axial direction), it is necessary to wind at least 90% of the total height of the winding, which is not affected by eddy currents, except for the ends of the winding. It is also necessary to uniformly increase the thickness of the metal sheet 7 in the middle portion of the winding. For this reason, the overall thickness of the metal sheet 7 increases,
It is unfortunate that the most important feature of foil-wound wires, which is their good space factor, has been lost. Further, since the thickness of the metal sheet 7 is uniform, there is a problem in that it is difficult to implement a cooling structure that allows cooling of the ends of the winding to be much better than that of the middle part of the winding.
発明の目的
本発明は箔巻巻線の占積率を低下させることなく巻線端
部における電流密度の増大を抑制して温度上昇を防止し
た変圧器を提供するものである。OBJECTS OF THE INVENTION The present invention provides a transformer that suppresses the increase in current density at the ends of the windings and prevents temperature rises without reducing the space factor of the foil-wound windings.
発明の概要
本発明の変圧器は、箔巻巻線からなる主巻線である低圧
巻線(内側巻線)の内側周囲および主巻線である高圧巻
線(外側巻線)の外側周囲のいずれか一方あるいは両方
に箔巻巻線からなる補助巻線を設けることによシ、渦電
流が主巻線の端部に殆んど生せず補助巻線の端部に集中
的に発生し、従って主巻線の端部における電流密度の増
大を抑制するものである。Summary of the Invention The transformer of the present invention has a main winding consisting of a foil-wound winding, which is a low-voltage winding (inner winding), and a main winding, which is a low-voltage winding (inner winding), and a main winding, which is a high-voltage winding (outer winding). By providing an auxiliary winding made of foil winding on one or both of them, eddy currents are hardly generated at the ends of the main winding and are concentrated at the ends of the auxiliary winding. , thus suppressing the increase in current density at the ends of the main winding.
発明の実施例
5−
第3図ないし第5図は本発明の変圧器の一実施例を示し
ている。この実施例の変圧器は前述した公知例と同様に
絶縁媒体を封入したタンク1の内部に設けた鉄心2に、
金属シート7と絶縁シート8とを重ねて巻いた箔巻巻線
からなる低圧巻線4と高圧巻線5を内外側同心円状に巻
装してあり、またクランf9,9が設けである。Embodiment 5 of the invention - Figures 3 to 5 show an embodiment of the transformer of the invention. The transformer of this embodiment has an iron core 2 provided inside a tank 1 filled with an insulating medium, similar to the previously mentioned known example.
A low-voltage winding 4 and a high-voltage winding 5, which are foil-wound wires made by overlapping metal sheets 7 and insulating sheets 8, are wound concentrically on the inside and outside, and clamps f9 and 9 are provided.
この実施例の変圧器においては、タンク1内における内
側巻線である低圧巻線4の内側周囲、すなわち低圧巻線
4と鉄心2の脚部との間には同心円状に補助巻fall
が設けてあシ、この補助線11は絶縁筒3を介して鉄心
2脚部に巻装される。なお、この補助巻線11と低圧巻
線4との間には絶縁バリヤ12が設けられる。また、外
側巻線である高圧巻線5の外側周囲、すなわち高圧巻線
5とタンク1の周壁部との間には同心円状に補助巻線1
1が設けてあシ、この補助巻線11は絶縁バリヤ13を
介して高圧巻線5に巻装される。このため、全体的には
鉄心2の脚部を中心として、絶縁筒3、補助巻線1ノ、
6−
絶縁バリヤ12、低圧巻線4、絶縁バリヤ6、高圧巻線
5、絶縁バリヤ13および補助巻線1ノの順で同心円状
に設けられる。これら各補助巻線11,1ノは、主巻線
である巻?;’、’p 4 + sと同様に金属シート
7と絶縁シート8とを重ねて巻いた箔巻巻線で構成され
ている。但し、この補助巻線11.11は巻線電圧も低
く、且つ巻線容量も少なく設定してあシ、この補助巻線
11.11を設けても変圧器全体の巻線重置に与える影
響は殆んど無視できる程度である。また、巻線4,5の
上下端部側に設けたクランプ9.9における巻線端部に
面する側面には、例えばけい素鋼板を積層して形成した
磁気シールド14.14が夫々設けである。In the transformer of this embodiment, an auxiliary winding is provided concentrically around the inner circumference of the low-voltage winding 4, which is the inner winding in the tank 1, that is, between the low-voltage winding 4 and the legs of the iron core 2.
This auxiliary wire 11 is wound around the two legs of the iron core via the insulating cylinder 3. Note that an insulating barrier 12 is provided between this auxiliary winding 11 and the low voltage winding 4. Further, an auxiliary winding 1 is arranged concentrically around the outer circumference of the high voltage winding 5 which is the outer winding, that is, between the high voltage winding 5 and the peripheral wall of the tank 1.
1 is provided, and this auxiliary winding 11 is wound around the high voltage winding 5 via an insulating barrier 13. Therefore, overall, the legs of the iron core 2 are centered, the insulating cylinder 3, the auxiliary winding 1,
6- The insulating barrier 12, the low voltage winding 4, the insulating barrier 6, the high voltage winding 5, the insulating barrier 13 and the auxiliary winding 1 are arranged concentrically in this order. Each of these auxiliary windings 11, 1 is a main winding. ;', 'p 4 + s It is composed of a foil-wound wire in which a metal sheet 7 and an insulating sheet 8 are overlapped and wound. However, this auxiliary winding 11.11 has a low winding voltage and a low winding capacity, so even if this auxiliary winding 11.11 is provided, it will have no effect on the overall winding arrangement of the transformer. is almost negligible. Furthermore, magnetic shields 14 and 14 formed by laminating silicon steel plates, for example, are provided on the side faces of the clamps 9.9 provided at the upper and lower ends of the windings 4 and 5, respectively, facing the ends of the windings. be.
しかして、このように構成された変圧器において、低圧
巻線4および高圧巻線5に負荷電流を流すと、各巻線4
,5における薄い金属シート7の上下端部には、巻線癩
れ磁束の水平方向成分を打ち消すための渦電流が殆んど
流れず、低圧@線3の内側に設けた補助巻線11と高圧
巻線4の外側に設けた補助巻線11の各上下端部に集中
して渦電流が流れる。このために、各巻線4,5の上下
端部すなわち金網シート7の状態に々るから、巻線4,
5の上下端部における極端々電流密度の上昇は大幅に緩
和される。Therefore, in the transformer configured in this way, when a load current is passed through the low voltage winding 4 and the high voltage winding 5, each winding 4
, 5, almost no eddy current flows in the upper and lower ends of the thin metal sheet 7 for canceling the horizontal component of the winding flux, and the auxiliary winding 11 provided inside the low-voltage wire 3 and Eddy currents flow concentrated at the upper and lower ends of the auxiliary winding 11 provided outside the high-voltage winding 4. For this purpose, since the upper and lower ends of each winding 4, 5, that is, the condition of the wire mesh sheet 7, are
The extreme increase in current density at the upper and lower ends of 5 is significantly alleviated.
この場合の巻線4,5端部における電流密度分布の特性
を第5図に示す。この線図でAiは巻込−中4端部の、
B′線は巻線5端部の電流密度を示している。この線図
によれば第2図で示す従来変圧器における巻線端部の電
流密度に比して大幅に低下していることが判る。従って
、巻&!4゜5端部は電流密度の増大による温度の異常
な上昇がない。そして、高圧巻線5の外側に設けた補助
巻線11よりも外側に巻線漏れ磁束が漏れ出さないので
、漏れ磁束によるタンク1の壁部の過熱を防止できるの
で、従来タンク1の壁部に11ソ伺けていたタンクシー
ルド10は不要となる、寸だ、低圧鉄心4の内側に設け
た補助省線11よりも内側に巻線漏れ、磁束が漏れ出さ
ないので、巻線漏れ磁束による鉄心2およびその周辺の
金属構造材の過熱を防止できる。さらに、クランプ9,
9に取付けた磁気シールド14.14は、巻線漏れ磁束
の巻線4,5内での直進性をより強め巻線4,5の上下
端部にわずかに残る渦電流をさらに低減させる効果があ
る。そして、各巻線4,5における金属シート7は渦電
流による温度上昇を避けるために全体の厚さを増大する
必要が々いので、巻線4,5の占積率の低下を防止でき
る。The characteristics of the current density distribution at the ends of the windings 4 and 5 in this case are shown in FIG. In this diagram, Ai is the 4th end of the involute
Line B' shows the current density at the end of the winding 5. According to this diagram, it can be seen that the current density is significantly lower than the current density at the end of the winding in the conventional transformer shown in FIG. Therefore, volume &! At the 4°5 end, there is no abnormal rise in temperature due to an increase in current density. Since the winding leakage magnetic flux does not leak outside the auxiliary winding 11 provided on the outside of the high-voltage winding 5, overheating of the wall of the tank 1 due to the leakage magnetic flux can be prevented. The tank shield 10, which had been used for 11 years, is no longer necessary, because the winding leaks inside the auxiliary wire-saving wire 11 installed inside the low-voltage core 4, and the magnetic flux does not leak out, so the leakage magnetic flux from the winding Overheating of the iron core 2 and the metal structural materials around it can be prevented. Furthermore, the clamp 9,
The magnetic shields 14 and 14 attached to the windings 9 have the effect of further increasing the straightness of the winding leakage magnetic flux within the windings 4 and 5, and further reducing the slight eddy current remaining at the upper and lower ends of the windings 4 and 5. be. Since it is necessary to increase the overall thickness of the metal sheet 7 in each of the windings 4 and 5 in order to avoid temperature rise due to eddy currents, a reduction in the space factor of the windings 4 and 5 can be prevented.
補助巻’Mzdll、11は定格電圧の低い三次巻線、
あるいは段絶縁の高圧巻線の中性点側タップ巻線のいず
れに接続してもよいが、いずれの場合であっても試験電
圧レベルは低く、第3図および第4図で示すように補助
巻線1ノとタンク1周壁部との間の絶縁距離d7、三相
の場合の各相間の絶縁距離d3け短くて良い。第1図で
示す高圧巻線5とタンクシールド10との間の絶縁距離
d4と、第2図で示す高圧巻線5と補助巻−9=
線11との間の絶縁距離d1を比較すれば、後者の絶縁
路l1IIldイの方が短くできる。すなわち、本発明
の変圧器では補助巻線11が高圧巻線5と同心円状に配
置されているため、この両者を絶縁筒で細いギャップに
仕切ったいわゆる多重バリヤ構造にした絶縁バリヤ13
を設けることにより、絶縁距離d1を大幅に短縮するこ
とが可能であるからである。Auxiliary winding 'Mzdll, 11 is a tertiary winding with a low rated voltage,
Alternatively, it may be connected to either the neutral tap winding of the step-insulated high-voltage winding, but in either case, the test voltage level is low, and the auxiliary The insulation distance d7 between the winding 1 and the circumferential wall of the tank 1, and the insulation distance d3 between each phase in the case of three phases, may be shorter. Comparing the insulation distance d4 between the high voltage winding 5 and the tank shield 10 shown in Fig. 1 and the insulation distance d1 between the high voltage winding 5 and the auxiliary winding -9 = wire 11 shown in Fig. 2, , the latter insulation path l1IIlda can be made shorter. That is, in the transformer of the present invention, since the auxiliary winding 11 is arranged concentrically with the high voltage winding 5, the insulating barrier 13 has a so-called multi-barrier structure in which the two are partitioned into a narrow gap by an insulating tube.
This is because by providing this, it is possible to significantly shorten the insulation distance d1.
発明の効果
は両方に箔巻巻線からなる補助巻線を設けることにより
、巻線の占積率を損なうことなく、巻線端部における電
流密度の増大を阻止して温度上昇を防止できる。The effect of the invention is that by providing auxiliary windings made of foil windings on both sides, it is possible to prevent an increase in current density at the ends of the windings and prevent a temperature rise without impairing the space factor of the windings.
第1図は従来の変圧器を示す概略的構成を示す縦断側面
図、第2図は従来変圧器における巻線端部の電流密度分
布を示す線図、第3図は本発明の変圧器の一実施例の概
略的構成を示す縦10−
断側面図、第4図は同平面図、第5図は同実施例の変圧
器における巻線端部の電流密度分布を示す線図である。
1・・・タンク、2・・・鉄心、3・・・絶縁筒、4・
・・低圧巻線、5・・・高圧巻線、6・・・絶縁バリヤ
、7・・・金属シート、8・・・絶縁シート、9・・・
クラン1.11・・・補助巻線、12 、7.9・・・
絶縁バリヤ、14・・・磁気シールド。
出願人代理人 弁理士 鈴 江 武 彦11−
碧2図Fig. 1 is a longitudinal side view showing the schematic configuration of a conventional transformer, Fig. 2 is a diagram showing the current density distribution at the end of the winding in the conventional transformer, and Fig. 3 is a diagram showing the current density distribution of the winding end of the conventional transformer. FIG. 4 is a plan view of the same, and FIG. 5 is a diagram showing the current density distribution at the end of the winding in the transformer of the embodiment. 1...tank, 2...iron core, 3...insulation tube, 4...
...Low voltage winding, 5...High voltage winding, 6...Insulation barrier, 7...Metal sheet, 8...Insulation sheet, 9...
Clan 1.11... Auxiliary winding, 12, 7.9...
Insulating barrier, 14...magnetic shield. Applicant's agent Patent attorney Takehiko Suzue 11- Aoi 2
Claims (1)
重ねて巻いた箔巻巻線からなる低圧巻線を巻装し、この
低圧巻線の外側に前記箔巻巻線からなる高圧巻線を巻装
したものにおいて、前記低圧巻線の内側および前記高圧
巻線の外側のいずれか一方あるいは両方に、前記箔巻巻
線からなる補助巻線を設けたことを特徴とする変圧器。A low-voltage winding made of a foil-wound winding made of overlapping metal sheets and insulating sheets is wound around an iron core provided inside the tank, and a high-voltage winding made of the foil-wound winding is placed outside of this low-voltage winding. What is claimed is: 1. A transformer in which an auxiliary winding made of the foil-wound wire is provided on either or both of the inside of the low-voltage winding and the outside of the high-voltage winding.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56184215A JPS5885510A (en) | 1981-11-17 | 1981-11-17 | Transformer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56184215A JPS5885510A (en) | 1981-11-17 | 1981-11-17 | Transformer |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5885510A true JPS5885510A (en) | 1983-05-21 |
JPH041489B2 JPH041489B2 (en) | 1992-01-13 |
Family
ID=16149376
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56184215A Granted JPS5885510A (en) | 1981-11-17 | 1981-11-17 | Transformer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5885510A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3809429A4 (en) * | 2019-08-28 | 2021-04-21 | Bombardier Nug Propulsion System Co., Ltd. | Transformer structure, and locomotive traction transformer |
-
1981
- 1981-11-17 JP JP56184215A patent/JPS5885510A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3809429A4 (en) * | 2019-08-28 | 2021-04-21 | Bombardier Nug Propulsion System Co., Ltd. | Transformer structure, and locomotive traction transformer |
Also Published As
Publication number | Publication date |
---|---|
JPH041489B2 (en) | 1992-01-13 |
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