JPS609333B2 - single phase transformer - Google Patents
single phase transformerInfo
- Publication number
- JPS609333B2 JPS609333B2 JP54097195A JP9719579A JPS609333B2 JP S609333 B2 JPS609333 B2 JP S609333B2 JP 54097195 A JP54097195 A JP 54097195A JP 9719579 A JP9719579 A JP 9719579A JP S609333 B2 JPS609333 B2 JP S609333B2
- Authority
- JP
- Japan
- Prior art keywords
- lead
- duct
- electrode
- high voltage
- unit
- 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
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
- H01F27/02—Casings
- H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
Description
【発明の詳細な説明】
この発明は、複数個の単位変圧器相互間をダクトを介し
て結合した単相変圧器に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a single-phase transformer in which a plurality of unit transformers are coupled together via a duct.
500KV以上の超々高圧送電では、変圧器の単器容量
が大形化し、内壁に設置される変電所では輸送寸法、重
量の制約から一般に単相器で構成されている。In ultra-high voltage power transmission of 500 KV or more, the capacity of a single transformer becomes large, and substations installed on inner walls are generally configured with single-phase transformers due to transportation size and weight constraints.
ところがこれら超々高圧変電所の用地確保の難しさから
、輸送条件はますます厳しくなる傾向にあり、今後、単
相器3台でバンクを構成できない場合が多くなることが
予想される。その場合単相器は複数台に分割され、1台
毎に輸送された単位変圧器は油中ダクト等により現地で
組合されて単相器を構成する。However, due to the difficulty in securing land for these ultra-high voltage substations, transportation conditions are becoming increasingly severe, and it is expected that in the future there will be many cases where it will not be possible to construct a bank with three single-phase transformers. In that case, the single-phase transformer is divided into a plurality of units, and the unit transformers that are transported one by one are assembled on-site through an oil-submerged duct or the like to form the single-phase transformer.
例えば第1図に示すように単相4脚鉄心1の2つの主脚
に、2脚並列に接続される高圧巻線2と中圧巻線3とを
巻袋してタンク4内に収納した単位変圧器を2台A,B
並列に接続して単相単巻変圧器1台を構成する場合、2
つの油中ダクト5a,5bを設け、このダクト5a,5
bを介して2台の単位変圧器A,Bを連結して高圧リー
ド6、中圧リード7を別々にそれぞれのダクトを通して
単位変圧器相互間の接続を行うことになる。この場合、
リード6,7が高電圧であれば、中心導体表面に絶縁紙
等による被覆を施こすと同時にその外側に何本かの絶縁
筒を同軸上に配置することによってリード絶縁表面の電
界集中部分の油道を細分化して耐圧の向上と安定化を図
ってきた。しかし、リードの対向電極であるダクト5a
,5bは、両タンク4,4を連結するためフランジを有
しており、この部分などで内面に凹凸が形成されるのを
避けることができない上に絶縁を施こすことが難しい。
従ってリードとダクト外の耐圧を上げるためには、ダク
トの寸法を大きくしてダクト側の電界を十分低く抑える
必要があった。しかし、このようにしてもなお、リード
接続作業が現地で行われるため、工場内のような完全な
防塵管理を期しがたく、万一異物が混入したりすれば、
非常に低い電界で絶縁破壊する恐れがある。この発明は
、2台以上の単位変圧器をダクトを介して接続して単位
変圧器を構成する場合、ダクトの数を半減させ、ダクト
寸法をコンパクト化し、リード絶縁の信頼性を向上させ
ることのできる単相変圧器を提供することを目的とする
。For example, as shown in Fig. 1, a unit in which a high voltage winding 2 and a medium voltage winding 3, which are connected in parallel to the two main legs of a single-phase four-leg iron core 1, are wrapped and stored in a tank 4. Two transformers A and B
When connecting in parallel to configure one single-phase autotransformer, 2
Two submerged oil ducts 5a, 5b are provided, and the ducts 5a, 5
The two unit transformers A and B are connected via the duct b, and the high-voltage lead 6 and medium-voltage lead 7 are connected to each other through their respective ducts. in this case,
If the leads 6 and 7 are at high voltage, the area where the electric field is concentrated on the lead insulating surface can be reduced by covering the center conductor surface with insulating paper or the like and at the same time arranging several insulating cylinders coaxially on the outside. Efforts have been made to improve pressure resistance and stability by subdividing oil pipes. However, the duct 5a, which is the counter electrode of the lead,
, 5b has a flange for connecting the two tanks 4, 4, and it is difficult to prevent unevenness from being formed on the inner surface at this portion, and it is difficult to insulate the tank.
Therefore, in order to increase the withstand voltage between the leads and the outside of the duct, it was necessary to increase the dimensions of the duct and suppress the electric field on the duct side to a sufficiently low level. However, even with this method, the lead connection work is still done on-site, so it is difficult to maintain complete dust-proof control like in a factory, and if foreign matter gets mixed in,
There is a risk of dielectric breakdown at very low electric fields. This invention reduces the number of ducts by half, compacts the duct dimensions, and improves the reliability of lead insulation when two or more unit transformers are connected via ducts to form a unit transformer. The purpose is to provide a single-phase transformer that can
以下、この発明を単位変圧器2台を並列に接続する場合
において図面を参照して説明する。第1図と同一部分に
は同一符号を付した第2図及び第3図において、2個の
単位変圧器A,Bは各タンク4,4の対向する側面中央
部で、油中ダクト15により連結されている。このダク
ト15は後述するが内部に同軸円筒状に配置された高圧
リード電極16、中圧リード電極17及び接地シールド
電極18を有している。各単位変圧器A,Bは単相4脚
鉄心1の2個の王脚にそれぞれ高圧巻線2、中圧巻線3
を巻装して構成され、高圧巻線2のほぼ中央部から高圧
リード6が引出される。これらの高圧リード6は単位変
圧器ごとに2つの主脚の中間の位置で一括されてダクト
15内の高圧リード電極16の端部にそれぞれ接続され
る。高圧巻線2と中圧巻線3の上端部及び高圧巻線2の
下端部から引出された中圧リード7は各単位変圧器ごと
に巻線上下端部とタンク4との間を水平に通して2個の
主脚の中間の位置で、上部のリードは下方に降ろし、下
部のリードは上方に立上げてそれぞれ高圧リード電極1
6の外側に配置された中圧リード電極17の端部にそれ
ぞれ接続される。更に高圧、中圧リード6,7は一方の
単位変圧器に取付けられた高圧ブッシング8と中圧ブッ
シング9にそれぞれ接続される。ダクト15の内部は第
4図に示すように、中心部を貫通する高圧リード電極1
6の外周面に絶縁被覆12を施こし、その外側に複数個
の円筒状の絶縁バーリャ13を介して中圧リード電極1
7を、高圧リード電極16と同軸状に設け、その外側に
複数個の絶縁バーリャ23を介して接地シールド電極1
8を、高圧、中圧リード電極16,17と同軸状に設け
て構成される。Hereinafter, the present invention will be described with reference to the drawings in the case where two unit transformers are connected in parallel. In FIGS. 2 and 3, in which the same parts as in FIG. connected. As will be described later, this duct 15 has a high voltage lead electrode 16, a medium voltage lead electrode 17, and a ground shield electrode 18 arranged in a coaxial cylindrical shape inside. Each unit transformer A, B has a high-voltage winding 2 and a medium-voltage winding 3 on two legs of a single-phase four-leg iron core 1, respectively.
A high voltage lead 6 is drawn out from approximately the center of the high voltage winding 2. These high voltage leads 6 are grouped together at a position between the two main legs for each unit transformer and are connected to the ends of high voltage lead electrodes 16 in the duct 15, respectively. The medium voltage lead 7 drawn out from the upper end of the high voltage winding 2 and the medium voltage winding 3 and the lower end of the high voltage winding 2 is passed horizontally between the upper and lower ends of the winding and the tank 4 for each unit transformer. At a position between the two main legs, the upper lead is lowered downward, the lower lead is raised upward, and each is connected to high voltage lead electrode 1.
6 are respectively connected to the ends of medium voltage lead electrodes 17 arranged outside. Further, the high voltage and medium voltage leads 6 and 7 are respectively connected to a high voltage bushing 8 and a medium voltage bushing 9 attached to one unit transformer. As shown in FIG. 4, the inside of the duct 15 has a high voltage lead electrode 1 passing through the center.
An insulating coating 12 is applied to the outer peripheral surface of the medium voltage lead electrode 1 through a plurality of cylindrical insulating barriers 13 on the outside thereof.
7 is provided coaxially with the high-voltage lead electrode 16, and a ground shield electrode 1 is connected to the outer side of the high-voltage lead electrode 16 via a plurality of insulating barriers 23.
8 is provided coaxially with high voltage and medium voltage lead electrodes 16 and 17.
そして高圧リード電極16は図示していないが高圧リー
ドと接続され、中圧リード電極17はその端部において
、上部から降ろされかつ下部から立上げられた中圧リー
ド7が接続される。このとき中圧リード電極17の端部
はダクト15の閉口部からの所定の絶縁距離が確保でき
る位置に配置し、先端部に適切な曲率の丸みをもたせて
電界集中を緩和する。またこれら中圧リード7及び中圧
リード電極17の外周面にも絶縁被覆22を施こす。接
地シールド電極18の端部はダクト15の閉口部に位置
させかつラッパ状に拡げてその部の電界集中を緩和する
。なお、この接地シールド電極18は適当な個所で接地
リード31によりダクト15に接続されている。このよ
うにして2台の単位変圧器間のりード薮銃を行えば、ダ
クトの数を半減できる。Although not shown, the high voltage lead electrode 16 is connected to a high voltage lead, and the intermediate voltage lead electrode 17 is connected at its end to the intermediate voltage lead 7 lowered from the upper part and raised from the lower part. At this time, the end of the medium voltage lead electrode 17 is placed at a position where a predetermined insulation distance from the closed part of the duct 15 can be secured, and the tip is rounded with an appropriate curvature to alleviate electric field concentration. Further, an insulating coating 22 is also applied to the outer peripheral surfaces of these medium voltage leads 7 and medium voltage lead electrodes 17. The end of the ground shield electrode 18 is located at the closed part of the duct 15 and spread out in a trumpet shape to alleviate electric field concentration in that part. Note that this ground shield electrode 18 is connected to the duct 15 through a ground lead 31 at an appropriate location. In this way, the number of ducts can be halved by connecting two unit transformers to each other.
また高、中圧リード電極16,17間および中圧リード
電極17と接地シールド電極18との間の絶縁は、何本
もの絶縁バーリャ13,23によって油道が細分化され
ているので、耐圧が向上するとともに破壊のバラッキが
小さくなって安定した絶縁特性が得られる。接地シール
ド電極18内に高中圧2本のりードを通す場合の寸法に
ついていえば、接地シールド電極18内を高圧リード電
極16だけを通す場合でも、高圧リード電極16と接地
シールド電極18との間の絶縁層内にある半径の円筒面
上の電圧が、中圧リード電極17と同じ電位になる面が
あるはずであり、この面上に中圧リード電極17を配贋
すれば、接地シールド電極18内に高圧リード電極16
だけを通す場合とほとんど同じスペースですむ。従って
ダクト15内に直接高圧リード電極16を通す場合に比
べて、絶縁バーリャ13,23による耐圧向上分だけコ
ンパクト化できる。更に、現地でダクト15の接続作業
を行う際にも高圧リード電極16から接地シールド電極
18までの絶縁構造を一括してリード線として扱うこと
によって工場で組立試験したがそのまま現地で組立再現
され、絶縁構造系の中に異物等の混入する余地はなく仮
にダクト接続作業中ダクト中に異物の混入があっても接
地シールド電極18とダクト15間には全く電圧がかか
らず絶縁上の心配は生じないといった効果もある。次に
本発明の他の実施例を第5図を参照して説明する。In addition, the insulation between the high and medium voltage lead electrodes 16 and 17 and between the medium voltage lead electrode 17 and the ground shield electrode 18 has a high withstand voltage because the oil passage is subdivided by a number of insulation barriers 13 and 23. As the insulation properties improve, the variation in breakdown becomes smaller and stable insulation properties can be obtained. Regarding the dimensions when two high-medium voltage leads are passed through the ground shield electrode 18, even when only the high voltage lead electrode 16 is passed through the ground shield electrode 18, there is a gap between the high voltage lead electrode 16 and the ground shield electrode 18. There must be a surface in which the voltage on the cylindrical surface of the radius in the insulating layer is the same potential as the medium voltage lead electrode 17, and if the medium voltage lead electrode 17 is placed on this surface, it becomes a ground shield electrode. High voltage lead electrode 16 inside 18
It takes up almost the same space as when passing only through it. Therefore, compared to the case where the high voltage lead electrode 16 is directly passed through the duct 15, the size can be reduced by the increase in withstand voltage due to the insulating barriers 13 and 23. Furthermore, when connecting the duct 15 on-site, the insulated structure from the high-voltage lead electrode 16 to the ground shield electrode 18 is treated as a lead wire, and even though it was assembled and tested at the factory, it was assembled and reproduced on-site as is. There is no room for foreign matter to get into the insulation structure system, and even if foreign matter gets into the duct during duct connection work, no voltage will be applied between the ground shield electrode 18 and the duct 15, so there is no need to worry about insulation. There are also effects that do not occur. Next, another embodiment of the present invention will be described with reference to FIG.
図において巻線2は、直列に2分割され、高圧線路端側
2aを一方の単位変圧器Aに、また中圧線路端側2bを
他方の単位変圧器Bに納め、中圧巻線3は2台の単位変
圧器A,Bにそれぞれ納めて並列に接続する。このとき
2台の単位変圧器A,Bを接続するり一ド‘ま、高圧線
路端と中圧線路端の中間の電位をする高圧リード6aと
中圧線路端の電位を有する中圧リード7aであり、高圧
リード6aを中心極として、また中圧リード7aをその
外側の円電極として、シールド電極18を含めて同軸配
の油中りードをダクト15のケース内を通すようにする
。In the figure, the winding 2 is divided into two parts in series, the high voltage line end 2a is placed in one unit transformer A, the medium voltage line end 2b is placed in the other unit transformer B, and the medium voltage winding 3 is placed in two unit transformers. They are placed in unit transformers A and B of the same unit and connected in parallel. At this time, when two unit transformers A and B are connected, the high voltage lead 6a has a potential intermediate between the high voltage line end and the medium voltage line end, and the medium voltage lead 7a has the potential of the medium voltage line end. With the high voltage lead 6a as the center pole and the medium voltage lead 7a as the outer circular electrode, a coaxial oil lead including the shield electrode 18 is passed through the case of the duct 15.
このような接続の場合も第2図の構成で説醸したものと
全く同じ効果がある。なお上記の実施例は、単相変圧器
を2分割する合かつ分割した単位変圧器が2脚並列の巻
線を有する場合について述べたが、この発明は単相変圧
器を3分割する場合、あるいは巻線の脚数も3脚以上の
場合にも実施できる。In the case of such a connection, the same effect as that explained in the configuration of FIG. 2 can be obtained. In the above embodiment, the case where a single-phase transformer is divided into two and the divided unit transformer has two parallel windings is described. Alternatively, the present invention can be implemented even when the number of legs of the winding is three or more.
更にまた、複数脚に巻装された巻線を並列に接続しない
場合にも実施できるなど、この発明は高圧リードと低圧
リードを単位変圧器相互間で接続する必要のあるすべて
の場合について適用できるものである。この発明は以上
説明したように、単相変圧器を複数台の単位変圧器に分
割し、これらを接続するとき高圧リード電極と低圧リー
ド電極とシールド電極とを同軸状に配置し、各電極間の
油道を絶縁バーリャで細分化した油中りードを用いるこ
とによってダクトの数を半減し、ダクトをコンパクト化
し、IJード絶縁の信頼性を向上させる効果がある。Furthermore, the present invention can be applied to all cases where high voltage leads and low voltage leads need to be connected between unit transformers, such as when windings wound around multiple legs are not connected in parallel. It is something. As explained above, this invention divides a single-phase transformer into a plurality of unit transformers, and when connecting these, high voltage lead electrodes, low voltage lead electrodes, and shield electrodes are arranged coaxially, and between each electrode By using an oil submerged lead in which the oil passage is subdivided by an insulating barrier, the number of ducts can be halved, the duct can be made more compact, and the reliability of IJ cord insulation can be improved.
第1図は従来の単位変圧器の接続構造を示す平面図、第
2図はこの発明による単相変圧器の実施例で単相変圧器
間の接続構造を示す平面図、第3図は第2図の一方の単
位変圧器を示す側面図、第4図は第2図のダクト関口部
分の詳細を示す断面図、第5図は本発明の他の実施例を
示すリード結線図である。
2…高圧巻線、3…中圧巻線、4…タンク、6,6a・
・・高圧リード、7,7a・・・中圧リード、13,2
3・・・絶縁バーリャ、15・・・ダクト、16・・・
高圧シールド電極、17・・・中圧シールド電極、18
・・・接地シールド。
第1図
第2図
第3図
第4図
第5図Fig. 1 is a plan view showing a connection structure of a conventional unit transformer, Fig. 2 is a plan view showing a connection structure between single-phase transformers in an embodiment of a single-phase transformer according to the present invention, and Fig. 3 is a plan view showing a connection structure between single-phase transformers. 2 is a side view showing one of the unit transformers, FIG. 4 is a sectional view showing details of the duct entrance portion in FIG. 2, and FIG. 5 is a lead connection diagram showing another embodiment of the present invention. 2...High voltage winding, 3...Medium voltage winding, 4...Tank, 6,6a・
...High voltage lead, 7,7a...Medium pressure lead, 13,2
3... Insulation barrier, 15... Duct, 16...
High voltage shield electrode, 17... Medium voltage shield electrode, 18
...Grounding shield. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5
Claims (1)
単位変圧器を構成するものにおいて前記ダクト内に、内
側から順に高圧リード電極、中圧リード電極および接地
シールド電極が同軸状に配置されかつ各電極間に複数個
の絶縁バーリヤが介在されたリードを挿入し、このリー
ドを介して単位変圧器相互間の接続を行つたことを特徴
とする単相変圧器。1. In a system in which a plurality of unit transformers are connected through a duct to form one unit transformer, a high voltage lead electrode, a medium voltage lead electrode, and a ground shield electrode are arranged coaxially in the duct in order from the inside. A single-phase transformer characterized in that a lead having a plurality of insulating barriers interposed between each electrode is inserted, and the unit transformers are connected to each other via the lead.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54097195A JPS609333B2 (en) | 1979-08-01 | 1979-08-01 | single phase transformer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54097195A JPS609333B2 (en) | 1979-08-01 | 1979-08-01 | single phase transformer |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5623720A JPS5623720A (en) | 1981-03-06 |
JPS609333B2 true JPS609333B2 (en) | 1985-03-09 |
Family
ID=14185801
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP54097195A Expired JPS609333B2 (en) | 1979-08-01 | 1979-08-01 | single phase transformer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS609333B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63159928U (en) * | 1987-04-09 | 1988-10-19 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5828813A (en) * | 1981-08-12 | 1983-02-19 | Mitsubishi Electric Corp | Barrier for oil-dipped lead wire |
JPS58132909A (en) * | 1982-02-03 | 1983-08-08 | Hitachi Ltd | Connecting device for stationary induction electric apparatus |
-
1979
- 1979-08-01 JP JP54097195A patent/JPS609333B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63159928U (en) * | 1987-04-09 | 1988-10-19 |
Also Published As
Publication number | Publication date |
---|---|
JPS5623720A (en) | 1981-03-06 |
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