JPS596494B2 - single phase auto transformer - Google Patents

Description

【発明の詳細な説明】 本発明は高電圧の単相単巻変圧器に関するものである。[Detailed description of the invention] The present invention relates to a high voltage single-phase autotransformer.

近年電力需要の増大に伴ない、５００ＫＶ送電が実現し
、近い将来にはさらに高電圧のＵＨＶ送電が計画されて
いる。In recent years, with the increase in power demand, 500 KV power transmission has been realized, and even higher voltage UHV power transmission is planned in the near future.

一般にこれ等高電圧用変圧器には単巻変圧器が多く採用
される。この種単巻変圧器の基本的な巻線配置と結線は
第１図に示すような構成である。すなわち、鉄心１の周
囲に内側より三次巻線４、分路巻線５、直列巻線６の順
で各巻線が巻装される。ＵＨＶ変圧器が１０００ＫＶと
５００ＫＶとを連系する場合には、一次端子Ｔに１００
０ＫＶ）二次端子８に５００ＫＶの高電圧がそれぞれ課
電される。したがつて直列巻線６からの一次端子口出し
は対地絶縁を考慮し巻線の中央部に配置して引出し、直
列巻線６の上下端からは二次端子８に接続する口出しを
引出す。分路巻線５の上端からは二次端子８につながる
口出しを、また下端からは一、二次共通の中性点端子９
を引出す構造となる。ところで我国においては、鉄道輸
送限界が極めて厳しく、比較的条件の良い所でも高さは
４２００言麗、輸送巾は３１００ｎ程度に制限される。Generally, autotransformers are often used as high voltage transformers. The basic winding arrangement and wiring connections of this type of autotransformer are as shown in FIG. That is, each winding is wound around the iron core 1 in the order of the tertiary winding 4, the shunt winding 5, and the series winding 6 from the inside. When the UHV transformer connects 1000KV and 500KV, 100KV is connected to the primary terminal T.
0 KV) A high voltage of 500 KV is applied to the secondary terminals 8, respectively. Therefore, the primary terminal leads from the series winding 6 are arranged and drawn out at the center of the winding in consideration of ground insulation, and leads connected to the secondary terminals 8 are drawn out from the upper and lower ends of the series winding 6. From the upper end of the shunt winding 5 there is an outlet connected to the secondary terminal 8, and from the lower end there is a neutral point terminal 9 common to the first and second terminals.
It has a structure that brings out the By the way, in our country, railway transportation limits are extremely strict, and even in relatively good conditions, the height is limited to 4,200 meters and the transportation width is limited to about 3,100 meters.

したがつて従来の５００ＫＶ変圧器では、この輸送限界
に対し第１図に示す単巻変圧器において、各巻線を２脚
から３脚の鉄心脚に分けて配置し、それぞれの巻線を並
列に接続することにより単器容量３３３から５００ＭＶ
Ａの変圧器を構成して輸送していた。ところが、ＵＨＶ
送電での送電容量は５００ＫＶ送電時の１０００から１
５００ＭＶＡに対し３０ＯＯＭＶＡ級に増大し、したが
つて単器容量５００ＭＶＡ６台により変圧器バンクが構
成されることになる。しかも同一輸送限界に対し同一単
器容量でかつ分路、直列両巻線に課電される電圧が２倍
となるため、５００ＫＶ変圧器とは比較とならない程高
電圧に耐える複雑な絶縁構成と絶縁距離の確保が必要と
なり、これ等絶縁の確保と輸送寸法制限とから分路巻線
および直列巻線は３個から４個の鉄心脚に分けて配置さ
れるようになつてくる。第２図にこのようなＵＨＶ変圧
器の巻線を、従来の５００ＫＶ変圧器と同じ配置と結線
で４個の鉄心脚に分散させ、これ等の分路、直列巻線を
それぞれ並列に接続して構成した場合の一実施例を示す
。Therefore, in the conventional 500KV transformer, in order to meet this transport limit, in the autotransformer shown in Figure 1, each winding is divided into two to three core legs, and each winding is placed in parallel. Single unit capacity from 333 to 500 MV by connecting
A transformer was constructed and transported. However, UHV
The transmission capacity for power transmission is 1000 to 1 when transmitting 500KV.
The 500 MVA is increased to 30 OOMVA class, and therefore a transformer bank is composed of six units with a single unit capacity of 500 MVA. Moreover, for the same transport limit, the voltage applied to both the shunt and series windings is twice as high with the same unit capacity, so it requires a complex insulation structure that can withstand incomparably higher voltages than a 500KV transformer. It is necessary to ensure an insulation distance, and in order to ensure this insulation and to limit transportation dimensions, shunt windings and series windings have come to be arranged in three to four core legs. Figure 2 shows how the windings of such a UHV transformer are distributed over four core legs with the same arrangement and connections as a conventional 500KV transformer, and these shunt and series windings are connected in parallel. An example of the configuration will be shown below.

鉄心１の４個の主脚１ａ乃至Ｉｄに分路、直列巻線を含
む各巻線２ａ、２ｂ、２ｃ、２ｄを巻装し、各分路、直
列巻線をそれぞれ並列に接続して構成したものである。Each winding 2a, 2b, 2c, 2d including a shunt and series winding is wound around the four main legs 1a to Id of the iron core 1, and each shunt and series winding is connected in parallel. It is something.

しかしながらこのような構成では常時対地電圧１０００
ＫＶの口出しを有する直列巻線が鉄心両側脚１ｅ，１ｆ
およびタンク３の両長辺側板とほマ全長にわたつて対向
することになる。したがつてこのような結線と巻線配置
では巻線２ａ乃至２ｄに対向する鉄心側脚１ｅ，１ｆお
よびタンク３との間の絶縁は総て１０００ＫＶに対して
決める必要があり、絶縁距離Ｒ，Ｓの確保はもとより接
地側の絶縁構成１１，１２も複雑化し、かつその取付面
積が広範囲となるため工作、組立作業によるわずかなバ
ラツキが直接変圧器の信頼性低下につながる欠点がある
。またタンク３にも巻線２ａ乃至２ｄの１０００ＫＶ課
電部分に対絶縁距離を確保するため膨張部３ａをほぼ全
長にわたり設ける必要が生じタンク強度土からも好まし
くない。本発明は上記のような従来の高電圧用単巻変圧
器における巻線配置と結線の欠点を除去し、ＵＨＶ変圧
器の絶縁に対する信頼性を向上させると共に絶縁構成、
タンク形状の簡略化を計ることの出来る高電圧用単相単
巻変圧器を提供することを目的とするものである。However, in such a configuration, the ground voltage is always 1000
Series windings with KV openings are on both legs 1e and 1f of the core.
And it faces both long side side plates of the tank 3 over the entire length. Therefore, in such a wiring connection and winding arrangement, the insulation between the core side legs 1e, 1f facing the windings 2a to 2d and the tank 3 must be determined for 1000 KV, and the insulation distance R, In addition to securing S, the insulation configurations 11 and 12 on the ground side are complicated, and the installation area is wide, so slight variations due to machining and assembly work directly lead to a decrease in the reliability of the transformer. Further, in order to ensure an insulation distance in the 1000 KV energized portion of the windings 2a to 2d in the tank 3, it is necessary to provide an expansion portion 3a over almost the entire length, which is not preferable in terms of tank strength. The present invention eliminates the drawbacks of the winding arrangement and wiring in the conventional high voltage autotransformer as described above, improves the reliability of the insulation of the UHV transformer, and improves the insulation structure.
The object of the present invention is to provide a high-voltage single-phase autotransformer that can simplify the tank shape.

本発明による単相単巻変圧器は１０００ＫＶ級ＵＨ変圧
器を構成する直列、分路の各巻線を輸送寸法制限より３
個以上の鉄心主脚に分割して配置する場合に、中間に位
置する直列巻線の上下端部を両側に位置する直列巻線の
巻線高さ方向の中央部にそれぞれ直列に接続し、中間に
位置する直列巻線の中央部から一次端子電圧１０００Ｋ
に荷電される一次端子を引出し、両側の直列巻線の高さ
方向中央部には一次端子と二次端子の中間電圧が荷電さ
れるように構成したものである。In the single-phase autotransformer according to the present invention, each of the series and shunt windings constituting a 1000 KV class UH transformer is
When the core is divided into two or more main legs, the upper and lower ends of the series winding located in the middle are connected in series to the central parts of the series windings located on both sides in the winding height direction, respectively, Primary terminal voltage 1000K from the center of the series winding located in the middle
The primary terminal is drawn out, and the central portion of the series windings on both sides in the height direction is charged with an intermediate voltage between the primary terminal and the secondary terminal.

以下本発明の一実施例を第３図及び第４図を参照して説
明する。４個の主脚１ａ乃至１ｄと２個の側脚１ｅ，１
ｆを有する鉄心１においてその両側に位置する主脚１ａ
，１ｄにそれぞれ内側から三次巻線４，４、分路巻線５
ａ，５ｄ１直列巻線６ａ，６ｄの順に同心配置して巻装
し、また中間に位置する主脚１ｂ，１ｃに内側から分路
巻線５ｂ，５ｄ１直列巻線６ｂ，６ｄを順に同心配置し
て巻装する。An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. 4 main legs 1a to 1d and 2 side legs 1e, 1
Main legs 1a located on both sides of iron core 1 having f
, 1d, tertiary windings 4, 4 and shunt winding 5 from the inside, respectively.
a, 5d1 series windings 6a, 6d are concentrically arranged and wound in this order, and shunt windings 5b, 5d1 series windings 6b, 6d are arranged concentrically in order from the inside on the main legs 1b, 1c located in the middle. and wrap it.

そして分路巻線５ａと５ｂ，５ｃと５ｄを並列に接続し
、直列巻線６ａと６ｂ，６ｃと６ｄをそれぞれ直列接続
し、そのうちの巻線６ｂと６ｃの巻線高さ中央部の口出
しを共通接続して引出して一次端子７とし、直列巻線６
ａと６ｄの巻線高さ中央部の口出し１０を一次端子電圧
１０００ＫＶと二次端子電圧５００ＫＶとの中間の７５
０ＫＶとする。これら巻線及び鉄心をタンク１３内に収
納し、このタンク１３の中間に位置する巻線５ｂと６ｂ
，５ｃと６ｃに対向する部分に膨張部１３ａを設けて絶
縁構成２２を施す。また各側脚１ｅ，１ｆの巻線に対向
する部分にも絶縁構成２１を施す。このような巻線配置
により、縁端で形成された段を有しているためその段の
電界緩和が難かしい鉄心側脚１ｅまたは１ｆに直接対向
する巻線４と５ａと６ａまたは４と５ｄと６ｄの電圧を
、一次端子と二次端子との中間電圧に下げる事が可能と
なるため側脚１ｅおよび１ｆ部の絶縁構成２１の簡略化
と絶縁距離Ｒ′の縮小が可能となる。一方、第４図から
判るようにタンク１３の膨張部１３ａも、１０００ＫＶ
が課電される直列巻線６ｂ，６ｃが中間部分だけになる
のでそれに応じて縮小され、タンク１３の長辺側板のほ
ぼ全長にわたつて設けなくてよいので、タンク１３強度
の低下を防止することが出来る。また１０００Ｋ巻線６
ｂ，６ｃに対向してタンク１３側面に取付けられる複雑
なバーリヤ構成２２もタンク１３側板の一部に限定する
ことが出来、工作、組立作業上のバラツキによる信頼性
の低下を防止することが可能となる。なお、１０００Ｋ
Ｖ一次端子７はタンク１３側壁面の開口部１３ｂから直
接引出し、ダクト１３ｃ等により他器と並列接続して単
相器を構成するため、一次端子７に接続する巻線６ｂ，
６ｃを中間に位置する主脚１ｂ，１ｃだけに配置しても
なんら支障となることはない。Then, the shunt windings 5a and 5b, 5c and 5d are connected in parallel, and the series windings 6a and 6b, 6c and 6d are connected in series, respectively, and the windings 6b and 6c are opened at the center of the winding height. are commonly connected and pulled out to form the primary terminal 7, and the series winding 6
The opening 10 at the center of the height of the windings a and 6d is set at 75, which is between the primary terminal voltage 1000KV and the secondary terminal voltage 500KV.
Set it to 0KV. These windings and iron cores are housed in a tank 13, and the windings 5b and 6b are located between the tank 13.
, 5c and 6c, an insulating structure 22 is provided by providing an expanded portion 13a in a portion facing each other. Further, an insulating structure 21 is also applied to the portions of each side leg 1e, 1f facing the windings. With such a winding arrangement, the windings 4 and 5a and 6a or 4 and 5d that directly oppose the core side leg 1e or 1f, which has a step formed at the edge and therefore is difficult to alleviate the electric field at that step, and 6d can be lowered to an intermediate voltage between the primary terminal and the secondary terminal, making it possible to simplify the insulation structure 21 of the side legs 1e and 1f and to reduce the insulation distance R'. On the other hand, as can be seen from FIG. 4, the expansion part 13a of the tank 13 also
Since the series windings 6b and 6c to which the voltage is applied are only in the middle portion, they are reduced accordingly, and do not need to be provided over almost the entire length of the long side plates of the tank 13, thereby preventing a decrease in the strength of the tank 13. I can do it. Also 1000K winding 6
The complicated barrier structure 22 attached to the side of the tank 13 opposite to b and 6c can be limited to a part of the side plate of the tank 13, making it possible to prevent a decrease in reliability due to variations in machining and assembly work. becomes. In addition, 1000K
The V primary terminal 7 is drawn out directly from the opening 13b on the side wall of the tank 13, and connected in parallel with other devices through a duct 13c etc. to form a single-phase device.
There is no problem in arranging 6c only on the main legs 1b and 1c located in between.

以上説明のように本発明によれば、絶縁に対する信頼性
を向上させると共に絶縁構成、タンク形状の簡略化を計
ることが出来、ＵＨＶ変圧器に適した単相単巻変圧器を
提供することが出来る。As described above, according to the present invention, it is possible to improve the reliability of insulation, simplify the insulation configuration and tank shape, and provide a single-phase autotransformer suitable for a UHV transformer. I can do it.

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

第１図は単巻変圧器内部の巻線配置と結線を示す図、第
２図は従来の単巻変圧器の平面断面図、第３図は本発明
の一実施例による単相単巻変圧器内部の巻線配置と結線
を示す図、第４図は第３図に示す単相単巻変圧器の平面
断面図である。 １，１ｅ乃至１ｆ・・・・・・鉄心および各鉄心脚、２
，２ａ乃至２ｄ・・・・・・直列、分路巻線を含む巻線
、３，３ａ，１３ａ・・・・・・タンクおよび側面の膨
張部、４・・・・・・三次巻線、５，５ａ，５ｂ，５ｃ
，５ｄ・・・・・・分路巻線、６，６ａ，６ｂ，６ｃ，
６ｄ・・・・・・直列巻線、７，８・・・・・・一次端
子、二次端子、１１，２１，１２，２２・・・・・・鉄
心側脚およびタンク側面の絶縁構成。Fig. 1 is a diagram showing the winding arrangement and connections inside an autotransformer, Fig. 2 is a plan sectional view of a conventional autotransformer, and Fig. 3 is a single-phase autotransformer according to an embodiment of the present invention. FIG. 4 is a plan sectional view of the single-phase autotransformer shown in FIG. 3. 1, 1e to 1f... core and each core leg, 2
, 2a to 2d... windings including series and shunt windings, 3, 3a, 13a... tank and side expansion part, 4... tertiary winding, 5, 5a, 5b, 5c
, 5d...Shunt winding, 6, 6a, 6b, 6c,
6d...Series winding, 7, 8...Primary terminal, secondary terminal, 11, 21, 12, 22...Insulation configuration of core side leg and tank side.

Claims (1)

【特許請求の範囲】[Claims] １ 直列巻線及び分路巻線を３個以上の鉄心主脚に分割
して巻装してタンク内に収納したものにおいて、中間に
位置する直列巻線の高さ方向の中央部から一次端子を引
出すと共に中間に位置する直列巻線の上下端部を両側に
位置する直列巻線の高さ方向の中央部にそれぞれ直列に
接続してこの部を一次端子電圧と二次端子電圧の中間電
圧としたことを特徴とする単相単巻変圧器。1 In a case where the series winding and shunt winding are divided and wound around three or more core main legs and stored in a tank, the primary terminal is connected from the heightwise center of the series winding located in the middle. At the same time, the upper and lower ends of the series windings located in the middle are connected in series to the central parts of the series windings located on both sides in the height direction, and this part is connected to the intermediate voltage between the primary terminal voltage and the secondary terminal voltage. A single-phase autotransformer characterized by: