JP2004186220A

JP2004186220A - Scott-type mold transformer

Info

Publication number: JP2004186220A
Application number: JP2002348544A
Authority: JP
Inventors: Kazuo Nishiyama; 和男西山
Original assignee: Hitachi Industrial Equipment Systems Co Ltd
Current assignee: Hitachi Industrial Equipment Systems Co Ltd
Priority date: 2002-11-29
Filing date: 2002-11-29
Publication date: 2004-07-02

Abstract

<P>PROBLEM TO BE SOLVED: To provide coil technology in which weight of a transformer can be reduced, tap connection is easy, and erroneous connection can be prevented; and which can correspond to large capacity in a Scott-type mold transformer. <P>SOLUTION: Exciting coils of a plurality of phases are composed of sheet-like aluminum materials as a primary side excitation part, and a plurality of tap lines are composed of sheet-like aluminum materials. Tap terminals are connected to the tap lines, and the prescribed tap terminals of the respective phases are interphase-connected by tap connection members. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明はスコット形モールド変圧器に関する。
【０００２】
【従来の技術】
従来、タップ切換え構造を有する低圧用スコット形モールド変圧器においては、励磁コイルの導体として銅の平角線を用い、所要のタップ電圧に対応する所定の巻数位置からタップ線を引き出し、タップ接続部材に接続することでタップ電圧を変更可能としていた。銅の平角線としては、断面積の小さい平角線を、コイルに流れる電流の大きさに応じた本数を重ねて巻線し、断面積を増やすようにしている。また、大容量のスコット形モールド変圧器では、励磁コイルの導体として、銅よりも軽くかつ曲げ変形等をし易いアルミニウムのシートを用いたものがある。
図７〜図９は、従来のスコット形モールド変圧器の構成例を示す。図７はスコット形モールド変圧器の斜視図、図８はタップ線を含めた結線図、図９は、図８の結線のうち主座コイル部分を示す図である。図７〜図９において、１０１はタップ端子、１０２ａはＵ相の１次側コイルのタップ端子どうしを接続するタップ接続部材、１０２ｂはＶ相の１次側コイルのタップ端子どうしを接続するタップ接続部材、１０２ｃはＷ相の１次側コイルのタップ端子どうしを接続するタップ接続部材、１０３は主座コイル（Ｕ相の１次側コイル＋Ｗ相の１次側コイル）、１０４はＴ座コイル（Ｖ相の１次側コイル）、１０５ａはＵ相の１次側コイルの端子（Ｕ相の１次側端子）、１０５ｂはＶ相の１次側コイルの端子（Ｖ相の１次側端子）、１０５ｃはＷ相の１次側コイルの端子（Ｗ相の１次側端子）、１０６ａ_１、１０６ａ_２、１０６ａ_３はＵ相の２次側コイルの端子（Ｕ相の２次側端子）、１０６ｂ_１、１０６ｂ_２、１０６ｂ_３はＶ相の２次側コイルの端子（Ｖ相の２次側端子）、１０７は磁気回路形成用の鉄心である。タップ端子１０１としては、主座コイル１０３を形成するＵ相の１次側コイルに対応するＮｏ．１〜４（図７の端子にＮｏ．付記）の４個のタップ端子と、Ｗ相の１次側コイルに対応するＮｏ．５〜８（図７の端子にＮｏ．付記）の４個のタップ端子と、Ｔ座コイル１０４を形成するＶ相の１次側コイルに対応するＮｏ．９〜１２（図７の端子にＮｏ．付記）の４個のタップ端子との全１２個を設けてある。タップ接続部材１０２ａは、Ｕ相の１次側コイルに対応する４個のタップ端子Ｎｏ．１〜４のうちの２つのタップ端子の組合せを、接続により３通り（Ｎｏ．１＋Ｎｏ．４、Ｎｏ．４＋Ｎｏ．２、Ｎｏ．２＋Ｎｏ．３）に選択する。タップ接続部材１０２ｃは、Ｗ相の１次側コイルに対応する４個のタップ端子Ｎｏ．５〜８のうちの２つのタップ端子の組合せを、接続により３通り（Ｎｏ．５＋Ｎｏ．８、Ｎｏ．８＋Ｎｏ．６、Ｎｏ．６＋Ｎｏ．７）に選択する。タップ接続部材１０２ｂは、Ｖ相の１次側コイルに対応する４個のタップ端子Ｎｏ．９〜１２のうちの２つのタップ端子の組合せを、接続により３通り（Ｎｏ．９＋Ｎｏ．１２、Ｎｏ．１２＋Ｎｏ．１０、Ｎｏ．１０＋Ｎｏ．１１）に選択する。タップ接続部材１０２ａでタップ端子Ｎｏ．２とＮｏ．３を接続し（Ｎｏ．２＋Ｎｏ．３）、タップ接続部材１０２ｃでタップ端子Ｎｏ．６とＮｏ．７を接続し（Ｎｏ．６＋Ｎｏ．７）、タップ接続部材１０２ｂでタップ端子Ｎｏ．１０とＮｏ．１１を接続したとき（Ｎｏ．１０＋Ｎｏ．１１）が、実効的なコイル巻数が最多となり、一方、タップ接続部材１０２ａでタップ端子Ｎｏ．１とＮｏ．４を接続し（Ｎｏ．１＋Ｎｏ．４）、タップ接続部材１０２ｃでタップ端子Ｎｏ．５とＮｏ．８を接続し（Ｎｏ．５＋Ｎｏ．８）、タップ接続部材１０２ｂでタップ端子Ｎｏ．９とＮｏ．１２を接続したとき（Ｎｏ．９＋Ｎｏ．１２）が、実効的なコイル巻数が最少となる。図７においては、タップ接続部材１０２ａは、Ｕ相の１次側コイルに対応するタップ端子Ｎｏ．２、Ｎｏ．４間に接続され、両タップ端子間のＵ相コイルを短絡してＵ相コイル全体としての実効的なコイル巻数を減らしている。タップ接続部材１０２ｃは、Ｗ相の１次側コイルに対応する４個のタップ端子のうちＮｏ．６とＮｏ．８との間に接続され、両タップ端子間のＷ相コイルを短絡してＷ相コイル全体としての実効的なコイル巻数を減らしている。また、タップ接続部材１０２ｂは、Ｖ相の１次側コイルに対応する４個のタップ端子のうちＮｏ．１０とＮｏ．１２との間に接続され、両タップ端子間のＶ相コイルを短絡してＶ相コイル全体としての実効的なコイル巻数を減らしている。本構成例では励磁コイルは、１次側コイル、２次側コイルとも、銅の平角線を用いている。タップ接続部材１０２ａ、１０２ｃ、１０２ｂの上記接続により、Ｕ、Ｗ、Ｖ相それぞれの１次側コイルの実効的なコイル巻数を変え、２次側コイルとの間の巻数比を変えて２次側コイルから出力する２相の電圧値を変える。
また、例えば特開平４−１０３１１６号公報（特許文献１）には、スコット結線変圧器において、タップ切換え操作の容易化とコイルの小形化とを目的に、Ｔ座コイルからコイル外周表面部に引き出した複数のタップ端子と、２分割した主座コイルからコイル外周表面部に引き出した複数のタップ端子との相互間を接続バーで連結するとともに、該接続バーによりタップ切換えを行うようにした構成が記載されている。コイル導体にシート状のアルミニウム材を用いる構成にはなっていない。
【０００３】
【特許文献１】
特開平４−１０３１１６号公報
【０００４】
【発明が解決しようとする課題】
励磁コイルの導体として、例えば上記のように銅の平角線を用いる構成では、電流の大きい大容量変圧器の場合は該平角線の重ね本数が多くなり、該平角線全体の断面積も大きくなる。このため、銅の材質的硬さも影響して、タップ線の引き出しや接続作業が困難になる。また、励磁コイルの導体としてアルミニウムのシートを用いる構成では、タップ線付きの構造とした場合、該タップ線はアルミニウムの平板として引き出すことになるため、曲げ方向によっては加工が難しく、タップ接続部材への接続が困難となる。また、スコット変圧器の励磁コイルの巻線の中間よりタップ線を引き出した場合、主座コイル部には２相分の励磁コイルを有するため、コイルより引き出すタップ線の数も多く、タップ接続部材への接続が複雑になる。さらに、タップ接続部材は各相毎に必要であって、３相で最小限３個必要となるため、タップ電圧を変更するとき誤接続してしまうおそれもある。
本発明の課題点は、かかる従来技術の状況に鑑み、タップ線付きのスコット形モールド変圧器において、（１）変圧器の重量を軽減できるようにすること、（２）タップ線とタップ接続部材の接続を容易に行えるようにすること、（３）タップ接続部材の数を減らせること、（４）誤接続を防止できるようにすること、（５）励磁コイルの導体の断面積を増大させたときも巻線作業等をし易く、大容量化に対応可能なこと、等である。
本発明の目的は、かかる課題点を解決できる技術の提供にある。
【０００５】
【課題を解決するための手段】
上記課題点を解決するために、本発明では、基本的に、スコット形モールド変圧器において、１次側励磁部として、複数相の励磁コイルをそれぞれシート状のアルミニウム材で構成し、複数のタップ線をそれぞれ板状のアルミニウム材で構成し、各タップ線にタップ端子を接続し、各相の所定のタップ端子をタップ接続部材で相間接続する。具体的には、（１）スコット形モールド変圧器として、１次側励磁部が、鉄心に巻かれたシート状のアルミニウム材から成る複数相の励磁コイル（該当実施例：符号１２１、１２２、１２３）と、板状のアルミニウム材から成り上記複数相の励磁コイルのそれぞれに対し所定の巻数位置に接続され該励磁コイルの外部に引き出された複数のタップ線（該当実施例：符号１３１〜１３９）と、該複数のタップ線のそれぞれに対応して複数個設けられ各タップ線に接続されたタップ端子（該当実施例：符号１１１）と、各相の所定のタップ端子を相間接続するタップ接続部材（該当実施例：符号１１２）とを備え、上記タップ端子を上記タップ接続部材により相間で選択的に接続することで上記複数相それぞれの励磁コイルの実効的な巻数を変え、２次側励磁部との間で低圧かつ大容量の電圧変換を可能にした構成とする。（２）上記（１）において、上記タップ端子は、相間接続される複数のタップ端子が略一直線上に配される構成とする。（３）上記（１）または（２）において、上記タップ端子は、相間接続される複数のタップ端子が相間で略等間隔に配される構成とする。（４）上記（１）、（２）または（３）において、上記タップ接続部材は、上記タップ端子を相間接続するための導電部を備えた１個の部材として構成する。
【０００６】
【発明の実施の形態】
以下、本発明の実施例につき、図面を用いて説明する。
図１〜図６は、本発明の実施例の説明図である。図１は、本発明のスコット形モールド変圧器の斜視図、図２はその励磁コイルの結線図、図３は、主座コイルにおけるタップ線引出しの説明図、図４は、主座コイルのうちＵ相コイルのタップ線の引出し状態とタップ端子との接続状態を示す斜視図、図５は、主座コイルのうちＷ相コイルのタップ線の引出し状態とタップ端子との接続状態を示す斜視図、図６は、図１のスコット形モールド変圧器を下方から見たときの図である。
本実施例では、１次側の励磁コイルにシート状のアルミニウム材を用い、該励磁コイルから引出すタップ線には板状のアルミニウム材を用いる。さらに、該タップ線のそれぞれに接続するタップ端子は、相間接続する複数のタップ端子を、略一直線上に、かつ、相間で略等間隔になるように配する。タップ端子は１相のコイルあたり３個設ける。
【０００７】
図１〜図６において、１１１はそれぞれ９個のタップ端子、１１２は直線状のタップ接続部材、１１３は主座コイル（Ｕ相の１次側コイル１２１＋Ｗ相の１次側コイル１２３）、１１４はＴ座コイル（Ｖ相の１次側コイル１２２）、１３１〜１３３は、Ｕ相の１次側コイル１２１からのタップ線、１３４〜１３６は、Ｗ相の１次側コイル１２３からのタップ線、１３７〜１３９は、Ｖ相の１次側コイル１２２からのタップ線、１１５ａはＵ相の１次側コイル１２１の端子（Ｕ相の１次側端子）、１１５ｂはＶ相の１次側コイル１２２の端子（Ｖ相の１次側端子）、１１５ｃはＷ相の１次側コイル１２３の端子（Ｗ相の１次側端子）、１１６ａ_１、１１６ａ_２、１１６ａ_３はＵ相の２次側コイルの端子（Ｕ相の２次側端子）、１１６ｂ_１、１１６ｂ_２、１１６ｂ_３はＶ相の２次側コイルの端子（Ｖ相の２次側端子）、１１７は磁気回路形成用の鉄心、１４４、１４５、１４６はＷ相の１次側コイル１２３に対応するタップ端子の引出し位置と順序を変えるための接続片である。タップ端子１１１としては、主座コイル１１３を形成するＵ相の１次側コイル１２１に対応するＮｏ．１〜３（図１のタップ端子にＮｏ．付記）の３個のタップ端子と、Ｗ相の１次側コイル１２３に対応するＮｏ．４〜６（図１のタップ端子にＮｏ．付記）の３個のタップ端子と、Ｔ座コイル１１４を形成するＶ相の１次側コイル１２２に対応するＮｏ．７〜９（図１のタップ端子にＮｏ．付記）の３個のタップ端子との全９個を設けてある。タップ接続部材１１２は、Ｕ相の１次側コイル１２１に対応する３個のタップ端子Ｎｏ．１〜３のうちの１つと、Ｗ相の１次側コイル１２３に対応する３個のタップ端子Ｎｏ．４〜６のうちの１つと、Ｖ相の１次側コイル１２２に対応する３個のタップ端子Ｎｏ．７〜９のうちの１つとを互いに接続する。該接続により３通り（Ｎｏ．１＋Ｎｏ．４＋Ｎｏ．７、Ｎｏ．２＋Ｎｏ．５＋Ｎｏ．８、Ｎｏ．３＋Ｎｏ．６＋Ｎｏ．９）の選択が可能である。タップ接続部材１１２により、タップ端子を、Ｎｏ．１＋Ｎｏ．４＋Ｎｏ．７の接続とした場合には、１次側の励磁コイルの実効的なコイル巻数が最も少なくなり、タップ端子を、Ｎｏ．３＋Ｎｏ．６＋Ｎｏ．９の接続とした場合には、１次側の励磁コイルの実効的なコイル巻数は最も多い状態となる。図１においては、タップ接続部材１１２は、Ｕ相の１次側コイルに対応するタップ端子Ｎｏ．２と、Ｗ相の１次側コイルに対応するタップ端子Ｎｏ．５と、Ｖ相の１次側コイルに対応するタップ端子Ｎｏ．８とを接続している。本構成例では励磁コイルは、１次側コイル、２次側コイルとも、シート状のアルミニウム材を用いている。また、図３に示すタップ線１３１〜１３９としては、板状のアルミニウム材を用いる。該タップ線１３１〜１３９はそれぞれ、対応する各相の１次側コイル中では、端部が、該１次側コイルのシート状のアルミニウム材に溶接によって接続され、また、１次側コイルから引出された外側部分では、それぞれが、一方向に曲がった略コ字状の形状にされ、端部にタップ端子１１１が接続されている。タップ端子１１１は、相間接続する複数のタップ端子を、略一直線上に、かつ、相間で略等間隔になるように配する。すなわち、タップ端子１１１のＮｏ．１、Ｎｏ．４、Ｎｏ．７を略一直線上にかつ略等間隔に配し、タップ端子１１１のＮｏ．２、Ｎｏ．５、Ｎｏ．８を略一直線上にかつ略等間隔に配し、タップ端子１１１のＮｏ．３、Ｎｏ．６、Ｎｏ．９を略一直線上は、かつ略等間隔に配する。Ｗ相の１次側コイル１２３のタップ端子１１１のＮｏ．４、Ｎｏ．５、Ｎｏ．６については、タップ線１３４、１３５、１３６の引出し端部の位置が、該１次側コイル１２３からタップ線１３４、１３５、１３６の順になるため、上記タップ端子の直線上配置のために、接続片１４４、１４５、１４６により、１次側コイル１２３からみた順序をタップ線１３６、１３５、１３４の順になるように入替えてある。接続片１４５、１４６は互いに交差する構成によりタップ線１３５、１３６の引出し順序を変えている。上記のように、タップ接続部材１１２のタップ端子への接続により、Ｕ、Ｗ、Ｖ相それぞれの１次側コイルの実効的なコイル巻数を変え、２次側コイルとの間の巻数比を変えて２次側コイルから出力する２相の電圧値を変える。
【０００８】
上記実施例の構成によれば、タップ線付きのスコット形モールド変圧器において、励磁コイルやタップ線をアルミニウム材で構成するため、変圧器の重量を軽減化することが可能となる。タップ線とタップ接続部材の接続も容易となる。タップ接続部材の数も減らすことができる。さらに、誤接続を防止することができ、安全性を向上させることができる。励磁コイル導体の断面積を増大させたときも巻線作業等をし易く、大容量化にも対応可能である。コストの低減化も可能となる。
なお、上記実施例では、相間接続する複数のタップ端子を、略一直線上に、かつ、相間で略等間隔になるように配する構成としたが、本発明はこれに限定されない。
【０００９】
【発明の効果】
本発明によれば、スコット形モールド変圧器において、変圧器の重量を減らすことができ、かつ、タップ接続部材の接続も容易となる。誤接続も防止することができ、安全性を向上させることができる。大容量化にも対応可能である。コストを減らすこともできる。
【図面の簡単な説明】
【図１】本発明の実施例としてのスコット形モールド変圧器の斜視図である。
【図２】図１のスコット形モールド変圧器の励磁コイルの結線図である。
【図３】図１のスコット形モールド変圧器の励磁コイルの主座コイルにおけるタップ線引出しの説明図である。
【図４】主座コイルのうちＵ相コイルのタップ線の引出し状態とタップ端子との接続状態を示す斜視図である。
【図５】主座コイルのうちＷ相コイルのタップ線の引出し状態とタップ端子との接続状態を示す斜視図である。
【図６】図１のスコット形モールド変圧器を下方から見たときの図である。
【図７】従来のスコット形モールド変圧器の斜視図である。
【図８】図７のスコット形モールド変圧器におけるタップ線を含めた結線図である。
【図９】図８の結線のうち主座コイル部分を示す図である。
【符号の説明】
１０１、１１１…タップ端子、１０２ａ、１０２ｂ、１０２ｃ、１１２ …タップ接続部材、１０３、１１３…主座コイル、１０４、１１４…Ｔ座コイル、１２１…Ｕ相の１次側コイル、１２２…Ｖ相の１次側コイル、１２３…Ｗ相の１次側コイル、１３１〜１３３…Ｕ相の１次側コイル１２１からのタップ線、１３４〜１３６…Ｗ相の１次側コイル１２３からのタップ線、１３７〜１３９…Ｖ相の１次側コイル１２２からのタップ線、１０５ａ、１１５ａ…Ｕ相の１次側コイル１２１の端子、１０５ｂ、１１５ｂ…Ｖ相の１次側コイル１２２の端子、１０５ｃ、１１５ｃ…Ｗ相の１次側コイル１２３の端子、１０６ａ_１、１０６ａ_２、１０６ａ_３、１１６ａ_１、１１６ａ_２、１１６ａ_３…Ｕ相の２次側コイルの端子、１０６ｂ_１、１０６ｂ_２、１０６ｂ_３、１１６ｂ_１、１１６ｂ_２、１１６ｂ_３…Ｖ相の２次側コイルの端子、１０７、１１７…鉄心、１４４、１４５、１４６…接続片。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a Scott-type molded transformer.
[0002]
[Prior art]
Conventionally, in a Scott type molded transformer for low voltage having a tap switching structure, a copper flat wire is used as a conductor of an exciting coil, a tap wire is pulled out from a predetermined number of winding positions corresponding to a required tap voltage, and the tap connecting member is The tap voltage can be changed by connecting. As the copper rectangular wire, a rectangular wire having a small cross-sectional area is wound in a number of times corresponding to the magnitude of the current flowing through the coil and wound to increase the cross-sectional area. Further, in a large-capacity Scott-type molded transformer, there is a transformer using an aluminum sheet which is lighter than copper and easily deforms in bending, etc., as a conductor of the exciting coil.
7 to 9 show configuration examples of a conventional Scott-type molded transformer. 7 is a perspective view of a Scott-type molded transformer, FIG. 8 is a connection diagram including a tap wire, and FIG. 9 is a diagram illustrating a main coil portion of the connection of FIG. 7 to 9, reference numeral 101 denotes a tap terminal, 102a denotes a tap connection member for connecting tap terminals of a U-phase primary coil, and 102b denotes tap connection for connecting tap terminals of a V-phase primary coil. 102c is a tap connection member for connecting tap terminals of the W-phase primary coil, 103 is a main seat coil (U-phase primary coil + W-phase primary coil), 104 is a T-coil coil ( 105a is a terminal of a U-phase primary coil (primary terminal of U phase), 105b is a terminal of a primary coil of V phase (primary terminal of V phase). , 105c are W-phase primary coil terminals (W-phase primary terminals), 106a ₁ , 106a ₂ , 106a ₃ are U-phase secondary coil terminals (U-phase secondary terminals), 106b ₁ , 106b ₂ and 106b ₃ are V-phase secondary side cores. Reference numeral 107 denotes an iron terminal (V-phase secondary terminal), which is an iron core for forming a magnetic circuit. As the tap terminal 101, No. 1 corresponding to the U-phase primary coil forming the main seat coil 103. 7 (No. attached to the terminals in FIG. 7) and Nos. 1 to 4 corresponding to the W-phase primary coil. Nos. 5 to 8 (No. added to the terminals in FIG. 7) and Nos. Nos. Corresponding to the V-phase primary coil forming the T-seat coil 104. There are provided a total of twelve tap terminals, namely, four tap terminals 9 to 12 (No. added to the terminals in FIG. 7). The tap connection member 102a has four tap terminals No. 4 corresponding to the U-phase primary coil. Three combinations (No. 1 + No. 4, No. 4 + No. 2, and No. 2 + No. 3) of combinations of two tap terminals out of 1-4 are selected by connection. The tap connection member 102c has four tap terminals No. 4 corresponding to the W-phase primary coil. Three combinations (No. 5 + No. 8, No. 8 + No. 6, and No. 6 + No. 7) of two tap terminals out of 5 to 8 are selected by connection. The tap connection member 102b has four tap terminals No. 4 corresponding to the V-phase primary coil. Three combinations (No. 9 + No. 12, No. 12 + No. 10, and No. 10 + No. 11) of two tap terminals out of 9 to 12 are selected by connection. Tap terminal No. with tap connection member 102a. 2 and No. No. 3 is connected (No. 2 + No. 3), and tap terminal No. 3 is connected with the tap connecting member 102c. 6 and no. No. 7 is connected (No. 6 + No. 7), and the tap terminal No. 7 is connected with the tap connecting member 102b. 10 and No. 11 is connected (No. 10 + No. 11), the effective number of coil turns is the largest, while the tap terminal No. 11 is connected by the tap connecting member 102a. 1 and No. No. 4 is connected (No. 1 + No. 4), and the tap terminal No. 4 is connected with the tap connecting member 102c. 5 and No. 5 No. 8 is connected (No. 5 + No. 8), and tap terminal No. 8 is connected with the tap connecting member 102b. 9 and no. When No. 12 is connected (No. 9 + No. 12), the effective number of coil turns is minimized. In FIG. 7, the tap connecting member 102a has a tap terminal No. corresponding to the U-phase primary coil. 2, No. 4, the U-phase coil between both tap terminals is short-circuited to reduce the effective number of coil turns of the entire U-phase coil. The tap connecting member 102c is the No. 1 of the four tap terminals corresponding to the W-phase primary coil. 6 and no. 8 and short-circuits the W-phase coil between both tap terminals to reduce the effective number of coil turns of the W-phase coil as a whole. In addition, the tap connection member 102b is the No. 4 terminal among the four tap terminals corresponding to the V-phase primary coil. 10 and No. 12, and the V-phase coil between both tap terminals is short-circuited to reduce the effective number of coil turns of the entire V-phase coil. In this configuration example, the exciting coil uses a rectangular copper wire for both the primary side coil and the secondary side coil. Due to the above connection of the tap connecting members 102a, 102c, 102b, the effective number of coil turns of the primary coil of each of the U, W, and V phases is changed, and the turns ratio between the secondary coil and the secondary coil is changed. The two-phase voltage value output from the coil is changed.
Also, for example, in Japanese Patent Application Laid-Open No. 4-103116 (Patent Document 1), a Scott connection transformer is drawn from a T-coil coil to the outer peripheral surface of the coil for the purpose of facilitating tap switching operation and downsizing the coil. The connection between the plurality of tap terminals and the plurality of tap terminals drawn out from the divided main seat coil to the outer peripheral surface of the coil is connected by a connection bar, and tap switching is performed by the connection bar. Has been described. It is not configured to use a sheet-like aluminum material for the coil conductor.
[0003]
[Patent Document 1]
JP-A-4-103116
[Problems to be solved by the invention]
In the configuration using a copper rectangular wire as the conductor of the exciting coil, for example, as described above, in the case of a large-capacity transformer having a large current, the number of overlapping rectangular wires increases, and the cross-sectional area of the entire rectangular wire also increases. . For this reason, it is difficult to pull out and connect the tap wire, also affected by the material hardness of copper. Also, in the configuration using an aluminum sheet as the conductor of the excitation coil, if a structure with a tap wire is used, the tap wire is drawn out as an aluminum flat plate, so it is difficult to process depending on the bending direction, and the tap connection member is difficult to be processed. Connection becomes difficult. In addition, when a tap wire is drawn from the middle of the winding of the excitation coil of the Scott transformer, the main coil portion has two phases of excitation coils, so that the number of tap wires drawn from the coil is large, and the tap connection member is provided. The connection to becomes complicated. Furthermore, since tap connection members are required for each phase, and a minimum of three tap connection members are required for three phases, there is a possibility that erroneous connection may occur when the tap voltage is changed.
SUMMARY OF THE INVENTION In view of the situation of the related art, a problem of the present invention is to provide a Scott-type molded transformer with a tap wire, (1) to reduce the weight of the transformer, and (2) a tap wire and a tap connecting member. (3) To reduce the number of tap connection members, (4) To prevent erroneous connection, (5) To increase the cross-sectional area of the conductor of the exciting coil This makes it easy to carry out winding work and the like, and can cope with an increase in capacity.
An object of the present invention is to provide a technique capable of solving such a problem.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, in the present invention, basically, in a Scott-type molded transformer, a plurality of excitation coils of a plurality of phases are each formed of a sheet-like aluminum material as a primary-side excitation unit, and a plurality of taps are provided. Each of the wires is made of a plate-like aluminum material, a tap terminal is connected to each tap wire, and a predetermined tap terminal of each phase is connected between phases by a tap connecting member. Specifically, (1) as a Scott-type molded transformer, a primary-side excitation unit is a multi-phase excitation coil made of a sheet-like aluminum material wound around an iron core (corresponding embodiments: reference numerals 121, 122, and 123) ) And a plurality of tap wires made of a plate-like aluminum material and connected to a predetermined number of turns for each of the above-described plural-phase excitation coils and drawn out of the excitation coils (corresponding embodiments: reference numerals 131 to 139). And a plurality of tap terminals (corresponding embodiment: reference numeral 111) provided corresponding to each of the plurality of tap lines and connected to each tap line, and a tap connecting member for connecting predetermined tap terminals of each phase between phases. (Applicable embodiment: reference numeral 112), and the effective number of turns of the exciting coils of each of the plurality of phases is changed by selectively connecting the tap terminals between the phases by the tap connecting members. A structure that enables the voltage conversion of the low-pressure and high capacity between the secondary side excitation portion. (2) In the above (1), the tap terminal is configured such that a plurality of tap terminals connected to each other are arranged substantially in a straight line. (3) In the above (1) or (2), the tap terminal has a configuration in which a plurality of tap terminals connected between phases are arranged at substantially equal intervals between phases. (4) In the above (1), (2) or (3), the tap connection member is configured as a single member including a conductive portion for connecting the tap terminals between phases.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 6 are explanatory diagrams of an embodiment of the present invention. FIG. 1 is a perspective view of a Scott-type molded transformer according to the present invention, FIG. 2 is a connection diagram of an exciting coil thereof, FIG. 3 is an explanatory view of tap wire drawing in a main seat coil, and FIG. FIG. 5 is a perspective view showing a drawn state of a tap wire of a U-phase coil and a connected state to a tap terminal. FIG. 5 is a perspective view showing a drawn state of a tap wire of a W-phase coil of a main seat coil and a connected state to a tap terminal. FIG. 6 is a view when the Scott-type molded transformer of FIG. 1 is viewed from below.
In this embodiment, a sheet-like aluminum material is used for the primary-side excitation coil, and a plate-like aluminum material is used for the tap wire drawn from the excitation coil. Further, as for the tap terminals connected to each of the tap wires, a plurality of tap terminals to be connected to each other are arranged on a substantially straight line and at substantially equal intervals between the phases. Three tap terminals are provided per one-phase coil.
[0007]
1 to 6, reference numeral 111 denotes nine tap terminals, 112 denotes a linear tap connection member, 113 denotes a main seat coil (U-phase primary coil 121 + W-phase primary coil 123), and 114 denotes a tap coil. T-coil coil (V-phase primary coil 122), 131 to 133 are tap wires from U-phase primary coil 121, 134 to 136 are tap wires from W-phase primary coil 123, 137 to 139 are tap wires from the V-phase primary coil 122, 115a is a terminal of the U-phase primary coil 121 (U-phase primary terminal), and 115b is a V-phase primary coil 122. (V-phase primary terminal), 115c is a W-phase primary coil 123 terminal (W-phase primary terminal), 116a ₁ , 116a ₂ , 116a ₃ are U-phase secondary coils (U-phase secondary side terminal), 116b ₁ , 116b ₂ and 116b ₃ are terminals of a V-phase secondary coil (V-phase secondary terminals), 117 is an iron core for forming a magnetic circuit, and 144, 145, and 146 correspond to the W-phase primary coil 123. This is a connecting piece for changing the drawing position and order of tap terminals to be drawn. The tap terminals 111 corresponding to the U-phase primary-side coils 121 forming the main seat coil 113 correspond to the Nos. No. 1 to No. 3 (No. added to the tap terminals in FIG. 1) and Nos. 1 to 3 corresponding to the W-phase primary coil 123. Nos. 4 to 6 (No. added to the tap terminals in FIG. 1) and Nos. 4 to 6 corresponding to the V-phase primary coil 122 forming the T-coil coil 114. A total of nine tap terminals are provided, including three tap terminals 7 to 9 (the tap terminals of FIG. 1 are numbered). The tap connecting member 112 has three tap terminals No. 3 corresponding to the U-phase primary coil 121. 1 to 3 and three tap terminals No. 1 corresponding to the W-phase primary coil 123. 4 to 6 and three tap terminals No. 3 corresponding to the V-phase primary coil 122. 7 to 9 are connected to each other. With this connection, three types (No. 1 + No. 4 + No. 7, No. 2 + No. 5 + No. 8, and No. 3 + No. 6 + No. 9) can be selected. With the tap connection member 112, the tap terminal is set to the No. 1 + No. 4 + No. 7, the effective number of coil turns of the primary-side excitation coil becomes the smallest, and the tap terminal is set to No. 3 + No. 6 + No. In the case of the connection of 9, the effective number of turns of the primary-side excitation coil is the largest. In FIG. 1, the tap connection member 112 has a tap terminal No. corresponding to the U-phase primary coil. 2 and the tap terminal No. corresponding to the W-phase primary coil. 5 and tap terminals No. 5 corresponding to the V-phase primary coil. 8 is connected. In this configuration example, the excitation coil uses a sheet-like aluminum material for both the primary side coil and the secondary side coil. As the tap wires 131 to 139 shown in FIG. 3, a plate-like aluminum material is used. The ends of the tap wires 131 to 139 are connected to the sheet-like aluminum material of the primary coil by welding in the primary coil of the corresponding phase, respectively, and are drawn from the primary coil. Each of the outer portions thus formed has a substantially U-shaped shape bent in one direction, and a tap terminal 111 is connected to an end portion. The tap terminal 111 arranges a plurality of tap terminals to be connected to each other on a substantially straight line and at substantially equal intervals between the phases. That is, No. of the tap terminal 111. 1, No. 4, no. 7 are arranged substantially on a straight line and at substantially equal intervals. 2, No. 5, no. 8 are arranged on substantially a straight line and at substantially equal intervals. 3, no. 6, no. 9 are arranged on a substantially straight line and at substantially equal intervals. No. of the tap terminal 111 of the W-phase primary side coil 123. 4, no. 5, no. With regard to No. 6, since the positions of the leading ends of the tap wires 134, 135, and 136 are in the order of the tap wires 134, 135, and 136 from the primary coil 123, the connection is performed because of the linear arrangement of the tap terminals. The pieces 144, 145, and 146 are rearranged so that the order viewed from the primary coil 123 is the order of the tap lines 136, 135, and 134. The connecting pieces 145 and 146 change the drawing order of the tap lines 135 and 136 due to the configuration intersecting each other. As described above, by connecting the tap connecting member 112 to the tap terminal, the effective number of turns of the primary coil of each of the U, W, and V phases is changed, and the turns ratio between the secondary coil and the primary coil is changed. To change the two-phase voltage output from the secondary coil.
[0008]
According to the configuration of the above embodiment, in the Scott-shaped molded transformer with tap wires, the exciting coil and the tap wires are made of aluminum material, so that the weight of the transformer can be reduced. The connection between the tap wire and the tap connection member is also facilitated. The number of tap connection members can also be reduced. Further, erroneous connection can be prevented, and safety can be improved. Even when the cross-sectional area of the exciting coil conductor is increased, the winding work or the like can be easily performed, and the capacity can be increased. Cost reduction can also be achieved.
In the above embodiment, the plurality of tap terminals to be connected between the phases are arranged substantially on a straight line and at substantially equal intervals between the phases, but the present invention is not limited to this.
[0009]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, in a Scott type | mold molded transformer, the weight of a transformer can be reduced and connection of a tap connection member becomes easy. Incorrect connection can be prevented, and safety can be improved. It is possible to cope with large capacity. Costs can also be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of a Scott-type molded transformer as an embodiment of the present invention.
FIG. 2 is a connection diagram of an exciting coil of the Scott-type molded transformer of FIG. 1;
FIG. 3 is an explanatory view of tap wire extraction in a main coil of an exciting coil of the Scott-type molded transformer of FIG. 1;
FIG. 4 is a perspective view showing a state in which a tap wire of a U-phase coil of the main seat coil is pulled out and a state of connection with a tap terminal;
FIG. 5 is a perspective view showing a state in which a tap wire of a W-phase coil of the main seat coil is drawn out and a state of connection with a tap terminal;
FIG. 6 is a view of the Scott-type molded transformer of FIG. 1 as viewed from below.
FIG. 7 is a perspective view of a conventional Scott-type molded transformer.
FIG. 8 is a connection diagram including a tap line in the Scott-type molded transformer of FIG. 7;
FIG. 9 is a view showing a main coil portion of the connection in FIG. 8;
[Explanation of symbols]
101, 111: Tap terminal, 102a, 102b, 102c, 112: Tap connecting member, 103, 113: Main coil, 104, 114: T coil, 121: Primary coil of U phase, 122: V phase Primary coil, 123 ... W-phase primary coil, 131-133 ... Tap wire from U-phase primary coil 121, 134-136 ... Tap wire from W-phase primary coil 123, 137 .. 139... Tap wires from the V-phase primary coil 122, 105 a, 115 a... Terminals of the U-phase primary coil 121, 105 b, 115 b ... terminals of the V-phase primary coil 122, 105 c, 115 c. terminal of the W-phase of the primary coil _{_{123, 106a 1, 106a 2,}} 106a 3, 116a 1, 116a 2, 116a 3 ... terminal of the secondary coil of U-phase, 10 _{_{_{b 1, 106b 2, 106b 3}}} , 116b 1, 116b 2, 116b 3 ... terminal of the secondary coil of the V-phase, 107, 117 ... core, 144, 145, 146 ... connecting piece.

Claims

A Scott-type molded transformer that converts a three-phase voltage input to a primary side into a two-phase voltage and outputs the converted voltage from a secondary side,
The primary-side excitation unit
A multi-phase excitation coil made of a sheet-like aluminum material wound around an iron core,
A plurality of tap wires made of a plate-like aluminum material, connected to a predetermined number of turns for each of the plurality of phases of the excitation coil, and drawn out of the excitation coil;
Tap terminals provided in plurality corresponding to each of the plurality of tap lines and connected to each tap line,
A tap connecting member for connecting predetermined tap terminals of each phase between phases;
By selectively connecting the tap terminals between the phases by the tap connection member, the effective number of turns of the exciting coils of each of the plurality of phases is changed, and a low pressure and large capacity A Scott-type molded transformer characterized by a configuration that enables voltage conversion.

The Scott type molded transformer according to claim 1, wherein the tap terminals are arranged such that a plurality of tap terminals connected to each other are substantially aligned with each other.

3. The Scott-type molded transformer according to claim 1, wherein a plurality of tap terminals connected to each other are arranged at substantially equal intervals between the phases. 4.

4. The Scott-type molded transformer according to claim 1, wherein the tap connection member is configured as a single member including a conductive portion for connecting the tap terminals between phases. 5.