JP3663054B2

JP3663054B2 - Tap switching device for winding of electrical equipment

Info

Publication number: JP3663054B2
Application number: JP17157598A
Authority: JP
Inventors: 敏伸森岡; 博司前田
Original assignee: ティーエム・ティーアンドディー株式会社
Priority date: 1998-06-18
Filing date: 1998-06-18
Publication date: 2005-06-22
Anticipated expiration: 2018-06-18
Also published as: JP2000012348A

Description

【０００１】
【発明の属する技術分野】
この発明は、例えば変圧器などの電気機器の巻線に設けられた複数のタップから選択して切り換えるタップ切換装置に関するものである。
【０００２】
【従来の技術】
図６に従来のタップ切換装置の結線図を示す。図６において、電気機器のライン側に接続された端子２には、主巻線４、第１および第２の粗タップ巻線６、８が直列接続されている。主巻線４と第１の粗タップ巻線６の接続点タップ２６は粗タップ切換手段２０の固定接点１０３に、第１の粗タップ巻線６と第２の粗タップ巻線８との接続点タップ２４は固定接点１０２に、第２の粗タップ巻線８の端部タップ２２は固定接点１０１にそれぞれ接続されている。粗タップ切換手段２０は可動接点４１と固定接点１０１、１０２、１０３との接触を切換えることによってタップ２２、２４、２６を切換える。粗タップ切換手段２０には密タップ巻線２８が直列に接続されている。密タップ巻線２８の各タップは密タップ切換手段３０の各固定接点１１〜１９に接続されている。密タップ切換手段３０の共通接続端子３２は電気機器巻線の中性点側に接続されている。共通接続端子３２に接続された可動接点４０と各固定接点１１〜１９との接続を切換えることにより密タップ切換を行う。粗タップ切換手段２０により大まかに、また密タップ切換手段３０により細かくタップ切換を行う。粗タップ切換手段２０と密タップ切換手段３０とを組み合わせることにより、全体的に多段数のタップ切換を行うことができる。
【０００３】
密タップ切換手段３０は、負荷電流を遮断せずに連続的にタップ切換を行いうる構造になっている。一方、粗タップ切換手段２０はタップ切換の際のタップ間電圧差が大きいため、通電したままでの切換は困難である。そこで粗タップ切換を行う場合、一旦密タップ切換手段３０を補助固定接点Ｋに接続し、粗タップ切換手段２０を非通電状態にしてから粗タップ切換を行う。この際、負荷への電流供給は、粗タップ切換手段２０に並列接続された補助切換手段３４を通じておこなわれるので、負荷への電力供給は遮断されない。
【０００４】
次にタップ切換装置の一般的な構成を図７に示す。図７において、ウォームホイール３６は、駆動手段（図示せず）により回転駆動される。ウォームホイール３６の回転軸と同軸の駆動軸３８には密タップ切換手段３０の可動接点４０が固定されており、その周囲には固定接点１１〜１９および補助固定接点Ｋ（図７では、固定接点１２および１７のみを図示）が配列されている。ウォームホイール３６が単位角度（この場合３６度）ずつ回転されることによってタップ切換を行う。駆動軸３８の下方には入力軸４４を介して粗タップ切換手段２０および補助切換手段３４を駆動するための駆動機構８０が設けられている。ウォームホイール３６の回転力は駆動軸３８および入力軸４４を介して駆動機構８０に伝達される。すなわち、密タップ切換手段３０の可動接点４０が１回転する動作に対応させて粗タップ切換手段２０および補助切換手段３４を動作させるものである。
【０００５】
図８、図９は、例えば、実開昭５８−１０３２４号公報に示されたような従来のタップ切換装置の駆動機構を示す側部部分断面図、およびその平面図である。また、図１０は粗タップ切換手段２０、補助切換手段３４が設置されている絶縁筒の斜視図であり、補助切換手段３４の固定接点１０１Ｋ、１０１Ｌ、１０２Ｋ、可動接点４２の端子Ｋ１、および粗タップ切換手段２０の固定接点１０１、１０２、１０３、可動接点４１の端子Ｏ１の１相分の絶縁筒７０上での配置を示している。
【０００６】
図８および図９において、入力軸４４の下端部４４ａには駆動レバー４６が固着され入力軸４４の回転により例えば図９中矢印Ａで示す方向に回転される。駆動レバー４６の下方には第１、第２の回転円盤５２、５２Ｋが回転自在に入力軸４４の中心軸に関して対称に設けられている。各回転円盤５２、５２Ｋの上面には第１、第２の歯車５１、５１Ｋが、また下面にはローラを有する第１、第２、第３、第４の突起５４１、５４２、５４Ｋ２、５４Ｋ１がそれぞれ設けられている。入力軸４４の下方には、第１、第２のゼネバギア５６、５６Ｋがそれぞれ相互に独立で、かつ、入力軸４４を中心に回転自在に設けられている。各ゼネバギア５６、５６Ｋにはそれぞれ出力軸５８および５８Ｋが固着されている。また各ゼネバギア５６、５６Ｋはそれぞれ２つの溝６０、６１および６０Ｋ、６１Ｋを有している。また、駆動軸レバー４６には各歯車５１、５１Ｋの歯と係合し、各歯車５１、５１Ｋを回転させるための複数のピン４８が植設されている。
図１１は、各タップポジションにおける接点位置を示す接点位置表である。
【０００７】
次に切換動作について説明する。
図９は、例えばタップポジションNo.1における状態、すなわち図６に示す状態に粗タップ切換手段２０、密タップ切換手段３０および補助切換手段３４が切り換えられている最大タップ状態を示している。この状態からタップポジションNo.2に切り換える場合、駆動軸３８が単位角度（３６度）回転され、この駆動軸３８に固着された密タップ切換手段３０の可動接点４０は固定接点１１との接触を解除され、隣接した固定接点１２に接触される。この時、駆動軸３８の回転は入力軸４４を介して駆動レバー４６に伝えられ、駆動レバー４６は図９中矢印の方向に単位角度（３６度）回転される。さらにNo.2からNo.3へ、No.3からNo.4へ、No.4からNo.5へと切換が続けられる。
【０００８】
さらにNo.5からNo.6へ切り換えられる場合、駆動レバー４６に設けられたピン４８が図中左側の第２の歯車５１Ｋに係合しつつ回転する。このときピン４８が伝達手段として作用し、第２の歯車５１Ｋおよび第２の回転円盤５２Ｋが半回転される。第２の回転円盤５２Ｋの半回転により、第４の突起５４Ｋ１が第２のゼネバギア５６Ｋの溝６０Ｋと係合し、第２のゼネバギア５６Ｋに固着された出力軸５８Ｋは補助切換手段３４の可動接点４２を固定接点１０１Ｋから１０１Ｌへ移動し接触させる。
さらに駆動軸３８の回転が続くと、タップポジションNo.10からNo.11に切り換わるとき、駆動レバー４６に設けられたピン４８が図９中右側の第１の歯車５１と係合しつつ回転する。これにより、第１の歯車５１および第１の回転円盤５２が半回転し、第１の突起５４１が第１のゼネバギア５６の溝６０と係合して第１のゼネバギア５６を所定角度回転させる。第１のゼネバギア５６に固着された出力軸５８も所定角度回転され、この出力軸５８に固着された粗タップ切換手段２０の可動接点４１は固定接点１０１から固定接点１０２に切り換えられる。この時、密タップ切換手段３０の可動接点４０は補助固定接点Ｋに接触されており、粗タップ切換手段２０には電流は流れていない。さらに駆動軸３８を介して駆動レバー４６を回転させることにより、図１１に示す順にタップポジション２５までタップ切換を行うことができる。
【０００９】
しかしながら、密タップ切換手段３０の接点にはまだ余裕が残っているにも拘わらず、タップポジションNo.25までしか切り換えることができない。その理由は、もしタップポジションNo.25から次のタップポジションに切り換えようとすると、駆動レバー４６に設けられたピン４８が第２の歯車５１Ｋと係合し、第２の歯車５１Ｋおよび第２の回転円盤５２Ｋを半回転させてしまう。この第２の回転円盤５２Ｋの回転により、第４の突起５４Ｋ１がゼネバギア５６Ｋの溝６０Ｋと係合して第２のゼネバギア５６Ｋを所定角度回転させてしまう。その結果、出力軸５８Ｋの回転を介して、すでに固定接点１０２Ｋに切り換えられている補助切換手段３４の可動接点４２が固定接点１０２Ｋから外れてしまうからである。
これを一般的に表現すると、密タップ切換手段３０の補助固定接点Ｋを含めた固定接点数をＮ（ここでは１０）、粗タップ巻線２０の固定接点数をｎ（ここでは３）とすれば、理論上では、（Ｎ×ｎ−１）のタップポジションを確保できる。ところが、上記のような従来のタップ切換装置では、切換可能なタップポジション数は、（Ｎ×ｎ−Ｎ／２）となる。
【００１０】
【発明が解決しようとする課題】
従来のタップ切換装置は、上記のように構成されているので、密タップ切換手段に設けられた固定接点を十分に利用しきれず、タップポジション数は（Ｎ×ｎ−Ｎ／２）に制限されるという問題があった。従来のタップ切換装置の構成で、補助切換手段に、新たな固定接点１個を追加して設けることにより、タップポジション数を（Ｎ×ｎ−１）まで増すことが可能であるが、そのためには新たに固定接点の配置場所を確保しなければならず、固定接点を取り付けている絶縁筒の径が大きくなり、またコストも上昇するので非合理である。
この発明は、上記のような問題を解決するためになされたものであり、接点数を増すことなく、タップポジション数を増すことができるタップ切換器を得ることを目的とする。
【００１１】
【課題を解決するための手段】
請求項１に係る電気機器巻線のタップ切換装置は、
所定の単位角度ずつ回転される駆動軸と、
第１の可動接点、補助固定接点および密タップ巻線に接続された第１の固定接点を有し駆動軸の単位角度ごとの回転により第１の可動接点と各第１の固定接点または補助固定接点のいずれかとの接触を切り換える密タップ切換手段と、
駆動軸に連動して回転する駆動レバーと、
第１および第２の突起を有し駆動レバーとは独立に設けられて駆動レバーの特定位置で駆動レバーと係合してその回転により回転駆動される第１の回転体と、
第１の回転体により駆動される第１の切換手段と、
粗タップ巻線に接続された第２の固定接点および密タップ巻線に接続された第２の可動接点を有し第１の切換手段に駆動されて第２の可動接点と第２の固定接点との接触を切り換える粗タップ切換手段と、
第３の突起を有し駆動レバーとは独立に設けられて駆動レバーの特定位置で駆動レバーと係合してその回転により回転駆動される第２の回転体と、
第２の回転体により駆動される第２の切換手段と、
粗タップ巻線に接続された第３の固定接点および密タップ切換手段の補助固定接点に接続された第３の可動接点を有し第２の切換手段に駆動されて第３の可動接点と第３の固定接点との接触を切り換える補助切換手段とを具備し、
密タップ切換手段の第１の可動接点が補助固定接点と接触した状態から隣接する第１の固定接点と接触するように切り換える際および第１の可動接点が隣接する第１の固定接点と接触した状態から補助固定接点と接触した状態に切り換えた際に、第１の回転体の第１、または第２の突起が第１の切換手段に係合して駆動するようにするとともに、
第１の切換手段の第２の可動接点が粗タップ巻線の中間タップに接続された状態でのみ第２の回転体の第３の突起が第２の切換手段に係合して駆動し、第２の可動接点が粗タップ巻線の巻線端タップに接続された状態では第２の回転体が第２の切換手段と非係合になるようにしたものである。
【００１２】
請求項２に係る電気機器巻線のタップ切換装置は、請求項１記載のものにおいて、
駆動レバーが単位角度内に設けられた複数個のピンを有し、
第１、第２の回転体は駆動軸の中心軸に関して互いに対称に設けられ、
第１の回転体が駆動レバーのピンによって回転させられる第１の歯車とこの第１の歯車と連動して回転する第１の回転円盤を有し、
第１、第２の突起は第１の回転円盤にその中心軸に関して互いに対称に設けられ、
第２の回転体が駆動レバーのピンによって回転させられる第２の歯車とこの第２の歯車と連動して回転する第２の回転円盤を有し、
第３の突起が第２の回転円盤に設けられ、
第１の切換手段が第１および第２の突起と係合する溝が形成された第１のゼネバギアを有し、
第２の切換手段が、第３の突起と係合する溝が形成され、第１のゼネバギアと同心的かつ独立に駆動される第２のゼネバギアを有するものである。
【００１３】
【発明の実施の形態】
図１は、この発明の一実施例におけるタップ切換装置の結線図である。図１において、変圧器などの電気機器の巻線のライン側に接続された端子２には、主巻線４、第１および第２の粗タップ巻線６、８からなる粗タップ巻線１が直列接続されている。２０は粗タップ切換手段、１０１〜１０３は第２の固定接点としての、粗タップ切換手段２０の固定接点であり、また４１は第２の可動接点としての、粗タップ切換手段２０の可動接点である。主巻線４と第１の粗タップ巻線６の接続点タップ２６は粗タップ切換手段２０の固定接点１０３に、第１の粗タップ巻線６と第２の粗タップ巻線８との接続点、つまり粗タップ巻線１の中間タップ２４は固定接点１０２に、第２の粗タップ巻線８の端部タップ２２は固定接点１０１にそれぞれ接続されている。
粗タップ切換手段２０は可動接点４１と固定接点１０１、１０２、１０３との接触を切り換えることによって各タップ２２、２４、２６を切り換える。粗タップ切換手段２０の可動接点４１には密タップ巻線２８が直列に接続されている。
【００１４】
３０は密タップ切換手段、１１〜１９は第１の固定接点としての、密タップ切換手段３０の固定接点であり、またＫは補助固定接点、４０は第１の可動接点としての、密タップ切換手段３０の可動接点である。密タップ巻線２８の各タップは密タップ切換手段３０の各固定接点１１〜１９に接続されている。密タップ切換手段３０の共通接続端子３２は電気機器巻線の中性点側に接続されている。
密タップ切換手段３０の可動接点４０と各固定接点１１〜１９との接続を切り換えることにより密タップ切換を行う。粗タップ切換手段２０により大まかに、また密タップ切換手段３０により細かくタップ切換を行う。粗タップ切換手段２０と密タップ切換手段３０とを組み合わせることにより、全体として多段数のタップ切換を行うことができる。
【００１５】
３４は補助切換手段、１０１Ｋ、１０２Ｋは第３の固定接点としての、補助タップ切換手段３４の固定接点であり、また４２は第３の可動接点としての、補助タップ切換手段３４の可動接点である。固定接点１０１Ｋ、１０２Ｋはそれぞれ粗タップ巻線１の各タップ２２、２４に接続されている。
密タップ切換手段３０は、負荷電流を遮断せずに連続的にタップ切換を行いうる構造になっている。一方、粗タップ切換手段２０はタップ切換の際のタップ間電圧差が大きいため、接点に負荷電流を流した状態では切換が困難である。そこで、粗タップ切換を行う場合、一旦密タップ切換手段３０で可動接点４０を補助固定接点Ｋに接続し、粗タップ切換手段２０を非通電状態にしてから粗タップ切換を行う。この際、負荷への電流供給は、粗タップ切換手段２０に並列接続された補助切換手段３４を通じておこなわれるので、負荷への電力供給は遮断されない。
【００１６】
この発明の一実施の形態におけるタップ切換装置の構成について図２、図３および図４を用いて説明する。図２はタップ切換装置の駆動機構の構成を示す平面図、図３はその側部部分断面図である。
また、各部材の全体的配置は、従来例と同様になっているので、図７を用いて説明する。図７において、ウォームホイール３６は、駆動手段（図示せず）により回転駆動される。ウォームホイール３６の回転軸と同軸の駆動軸３８には密タップ切換手段３０の可動接点４０が固定されており、その周囲には固定接点１１〜１９および補助固定接点Ｋ（図７では、固定接点１２および１７のみを図示）が配列されている。ウォームホイール３６が単位角度（この場合３６度）ずつ回転されることによってタップ切換を行う。駆動軸３８の下方には入力軸４４を介して粗タップ切換手段２０および補助切換手段３４を駆動するための駆動機構８０が設けられている。ウォームホイール３６の回転力は駆動軸３８および入力軸４４を介して駆動機構８０に伝達される。すなわち、密タップ切換手段３０の可動接点４０が１回転する動作に対応させて粗タップ切換手段２０および補助切換手段３４を動作させるものである。
【００１７】
次に、図２、図３により、駆動機構について説明する。入力軸４４の下端部４４ａには駆動レバー４６が固着され、入力軸４４の回転により例えば図２中矢印Ａで示す方向に回転される。駆動レバー４６には複数のピン４８が植設されている。駆動レバー４６の下方にはこれと独立に第１、第２の回転体５０、５０Ｋが設けられており、これらは駆動軸３８の中心軸、すなわち入力軸４４の中心軸に関して１８０度隔てて、つまり対称的に配置されている。第１の回転体５０は駆動レバー４６のピン４８と係合する第１の歯車５１および第１の歯車５１と一体に連動して回転する第１の回転円盤５２からなり、第２の回転体５０Ｋは同様に、ピン４８と係合する第２の歯車５１Ｋおよび第２の歯車５１Ｋと一体に連動して回転する第２の回転円盤５２Ｋからなっている。
【００１８】
駆動レバー４６の特定位置、すなわち駆動レバー４６が第１または第２の回転体５０、５０Ｋの位置にある状態でのみ、駆動レバー４６のピン４８が第１または第２の歯車５１、５１Ｋと係合するようになっている。また、複数のピン４８は単位角度（３６度）の範囲内に配置されているので、１タップ分の回転で上記係合が解除される。
【００１９】
第１の回転円盤５２の下面にはローラを有する第１、第２の突起５４１、５４２（突起２個）が設置されており、第２の回転円盤５２Ｋの下面にはローラを有する第３の突起５２Ｋ２（突起１個）が設けられている。入力軸４４の下方には、第１、第２の切換手段としての第１、第２のゼネバギア５６、５６Ｋがそれぞれ相互に独立で、かつ、入力軸４４を中心に回転自在に設けられている。各ゼネバギア５６、５６Ｋにはそれぞれ出力軸５８、５８Ｋが固着されている。また各ゼネバギア５６、５６Ｋはそれぞれ２つの溝６０、６１および６０Ｋ、６１Ｋを有している。
【００２０】
図４は、粗タップ切換手段２０、補助切換手段３４が設置されている絶縁筒の斜視図であり、補助切換手段３４の固定接点１０１Ｋ、１０２Ｋ、可動接点４２の端子Ｋ１、および粗タップ切換手段２０の固定接点１０１、１０２、１０３、可動接点４１の端子Ｏ１の１相分の絶縁筒７０上での配置を示している。
図５は、各タップポジションにおける接点位置を示す接点位置表であり、この実施の形態によれば、図５に示すようにNo.1からNo.29までのタップポジションが選択可能となる。
その動作について以下に図１〜図５を用いて説明する。
【００２１】
図２は、タップポジションNo.1の場合の状態を示している。すなわち、各切換手段２０、３０および３４が図１に示すように切り換えられている最大タップ状態を示している。この状態からタップポジションNo.2に切り換える場合、駆動軸３８が単位角度（この場合３６度）回転され、密タップ切換手段３０の可動接点４０は接点１１との接触を解除され、接点１２に接触される。この時、駆動軸３８の回転は、入力軸４４を介して駆動レバー４６に伝えられ、駆動レバー４６も図２中矢印Ａで示す方向に単位角度（３６度）回転される。つまり駆動レバー４６に設けられたピン４８は、第１の歯車５１から遠ざかっていくので、第１の歯車５１と一体となった第１の回転円盤５２は回転されない。同時に、第１のゼネバギア５６も回転されず、これに接続された粗タップ切換手段２０の切換は行われない。
【００２２】
さらにNo.2からNo.3へ、No.3からNo.4へ、No.4からNo.5へと切換が続けられる。さらにNo.5からNo.6へ切り換えられる場合、駆動レバー４６に設けられたピン４８が図２中左側の第２の歯車５１Ｋに係合しつつ回転する。このときピン４８が伝達手段として作用し、第２の歯車５１Ｋおよび第２の回転円盤５２Ｋが、図２中矢印Ｂ方向へ半回転されるが、第２の回転円盤５２Ｋの片側には突起がないため、第２のゼネバギア５６Ｋの溝６０Ｋと係合せず、第２のゼネバギア５６Ｋに固着された出力軸５８Ｋに接続されている補助切換手段３４の可動接点４２は移動しない。このとき第２の回転円盤５２Ｋに設置されている第３の突起５４Ｋ２は、図２中矢印Ｂ方向に第２の回転円盤５２Ｋと同時に１８０度回転する。
【００２３】
さらに駆動軸３８の回転が続くと、タップポジションNo.10からNo.11に切り換わるとき、駆動レバー４６に設けられたピン４８が図２中右側の第１の歯車５１と係合しつつ回転する。これにより、第１の歯車５１および第１の回転円盤５２が半回転し、第１の突起５４１が第１のゼネバギア５６の溝６０と係合して第１のゼネバギア５６を所定角度回転させる。第１のゼネバギア５６に固着された出力軸５８も所定角度回転され、この出力軸５８に固着された粗タップ切換手段２０の可動接点４１は固定接点１０１から固定接点１０２に切り換えられる。この時、密タップ切換手段３０の可動接点４０は補助固定接点Ｋに接触されており、粗タップ切換手段２０には電流は流れていない。すなわち、切り換えのタイミングとしては、まず粗タップ切換手段２０で固定接点１０１から固定接点１０２へ切り換え、続いて密タップ切換手段３０で補助固定接点Ｋから固定接点１１へ切り換えるようになっている。
【００２４】
さらに駆動軸３８の回転が続くと、タップポジションNo.15からNo.16へ切り換えられる場合、駆動レバー４６に設けられたピン４８が第２の歯車５１Ｋに係合しつつ回転する。このときピン４８が伝達手段として作用し、第２の歯車５１Ｋおよび第２の回転円盤５２Ｋが半回転される。第２の回転円盤５２Ｋの半回転により、第３の突起５４Ｋ２が第２のゼネバギア５６Ｋの溝６０Ｋと係合し、第２のゼネバギア５６Ｋに固着された出力軸５８Ｋは補助切換手段３４の可動接点４２を固定接点１０１Ｋから固定接点１０２Ｋに移動し接触させる。
この時、補助切換手段３４には、勿論電流が流れていない。
【００２５】
さらに駆動軸３８の回転が続くと、タップポジションNo.20からNo.21に切り換わるとき、駆動レバー４６に設けられたピン４８が第１の歯車５１と係合しつつ回転する。これにより、第１の歯車５１および第１の回転円盤５２が半回転し、第２の突起５４２が第１のゼネバギア５６の溝６１と係合して第１のゼネバギア５６所定角度回転させる。第１のゼネバギア５６に固着された出力軸５８も所定角度回転され、この出力軸５８に固着された粗タップ切換手段２０の可動接点４１は固定接点１０２から固定接点１０３に切り換えられる。この時、密タップ切換手段３０の可動接点４０は補助固定接点Ｋに接触されており、粗タップ切換手段２０には電流は流れていない。すなわち、この位置では、まず粗タップ切換手段２０で固定接点１０２から固定接点１０３へ切り換え、続いて密タップ切換手段３０で補助固定接点Ｋから固定接点１１へ切り換えるようになっている。
【００２６】
さらにNo.25からNo.26へ切り換えられる場合、駆動レバー４６に設けられたピン４８が第２の歯車５１Ｋに係合しつつ回転する。このときピン４８が伝達手段として作用し、第２の歯車５１Ｋおよび第２の回転円盤５２Ｋが半回転されるが、第２の回転円盤５２Ｋの片側には突起がないため、第２のゼネバギア５６Ｋの溝６０Ｋと係合せず、第２のゼネバギア５６Ｋに固着された出力軸５８Ｋに、接続されている補助切換手段３４の可動接点４２は移動しない。
したがって、補助切換手段３４の可動接点が移動しないため、可動接点４２は、固定接点１０２Ｋに接触されたままとなり、さらにタップポジションをNo.29まで切り換えが可能となる。
【００２７】
タップポジション２９の方からタップポジション１の方へ向かって切り換える場合は、上記説明と逆の動きをしてタップ切換が行われる。なお、タップポジション２１から２０への切り換えおよびタップポジション１１から１０への切り換え時は、まず密タップ切換手段３０で固定接点１１から補助固定接点Ｋへ切り換え、しかる後に粗タップ切換手段２０で固定接点１０３から１０２へ、あるいは固定接点１０２から１０１へ切り換える。したがって、いずれの粗タップ切換時も粗タップ切換手段２０には電流が流れていない。
【００２８】
【発明の効果】
この発明によれば、第２の可動接点が粗タップ巻線の中間タップに接続された状態でのみ第２の回転体が第２の切換手段を駆動するので、最大、最小タップポジション間で補助タップ切換手段の切り換えが１回しか行われず、したがって第３の可動接点が第３の固定接点から外れてしまうことなく、タップポジション数を増すことができる。
【図面の簡単な説明】
【図１】この発明の一実施の形態における電気機器のタップ切換装置の結線図である。
【図２】図１のタップ切換装置の駆動機構を示す平面図である。
【図３】図２の駆動機構の側部部分断面図である。
【図４】図１のタップ切換装置の絶縁筒の斜視図である。
【図５】図１のタップ切換装置の接点位置表である。
【図６】従来の電気機器のタップ切換装置の結線図である。
【図７】タップ切換装置の一般的な構成を示す断面図である。
【図８】図６のタップ切換装置の駆動機構を示す側部部分断面図である。
【図９】図８の駆動機構の平面図である。
【図１０】図６のタップ切換装置の絶縁筒の斜視図である。
【図１１】図６のタップ切換装置の接点位置表である。
【符号の説明】
１粗タップ巻線、
１０１〜１０３,１０１Ｋ,１０２Ｋ,１１〜１９固定接点、
２０粗タップ切換手段、２４中間タップ、２８密タップ巻線、
３０密タップ切換手段、３４補助切換手段、３８駆動軸、
４０,４１,４２可動接点、４６駆動レバー、４８ピン、
５０第１の回転体、５０Ｋ第２の回転体、５１第１の歯車、
５１Ｋ第２の歯車、５２第１の回転円盤、５２Ｋ第２の回転円盤、
５４１第１の突起、５４２第２の突起、５４Ｋ２第３の突起、
５６第１のゼネバギア、５６Ｋ第２のゼネバギア、６１,６１Ｋ溝、
Ｋ補助固定接点。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tap switching device that selects and switches from a plurality of taps provided in a winding of an electric device such as a transformer.
[0002]
[Prior art]
FIG. 6 shows a connection diagram of a conventional tap switching device. In FIG. 6, a main winding 4 and first and second coarse tap windings 6 and 8 are connected in series to a terminal 2 connected to the line side of the electric device. A connection point tap 26 between the main winding 4 and the first coarse tap winding 6 is connected to the fixed contact 103 of the coarse tap switching means 20 between the first coarse tap winding 6 and the second coarse tap winding 8. The point tap 24 is connected to the fixed contact 102, and the end tap 22 of the second coarse tap winding 8 is connected to the fixed contact 101. The coarse tap switching means 20 switches the taps 22, 24, and 26 by switching the contact between the movable contact 41 and the fixed contacts 101, 102, and 103. A dense tap winding 28 is connected in series to the coarse tap switching means 20. Each tap of the dense tap winding 28 is connected to each fixed contact 11 to 19 of the dense tap switching means 30. The common connection terminal 32 of the dense tap switching means 30 is connected to the neutral point side of the electrical equipment winding. The fine tap is switched by switching the connection between the movable contact 40 connected to the common connection terminal 32 and the fixed contacts 11 to 19. The rough tap switching means 20 performs rough tap switching and the fine tap switching means 30 performs fine tap switching. By combining the coarse tap switching means 20 and the fine tap switching means 30, a multi-stage tap switching can be performed as a whole.
[0003]
The fine tap switching means 30 has a structure capable of continuously performing tap switching without interrupting the load current. On the other hand, since the coarse tap switching means 20 has a large voltage difference between taps when switching taps, it is difficult to switch while the power is being supplied. Therefore, when the rough tap switching is performed, the fine tap switching means 30 is once connected to the auxiliary fixed contact K, and the rough tap switching is performed after the coarse tap switching means 20 is de-energized. At this time, the current supply to the load is performed through the auxiliary switching means 34 connected in parallel to the coarse tap switching means 20, so that the power supply to the load is not interrupted.
[0004]
Next, a general configuration of the tap switching device is shown in FIG. In FIG. 7, the worm wheel 36 is rotationally driven by a driving means (not shown). A movable contact 40 of the dense tap switching means 30 is fixed to a drive shaft 38 coaxial with the rotating shaft of the worm wheel 36, and fixed contacts 11 to 19 and auxiliary fixed contacts K (in FIG. Only 12 and 17 are shown). Tap switching is performed by rotating the worm wheel 36 by a unit angle (in this case, 36 degrees). Below the drive shaft 38, a drive mechanism 80 for driving the coarse tap switching means 20 and the auxiliary switching means 34 via the input shaft 44 is provided. The rotational force of the worm wheel 36 is transmitted to the drive mechanism 80 via the drive shaft 38 and the input shaft 44. That is, the coarse tap switching means 20 and the auxiliary switching means 34 are operated in response to the operation in which the movable contact 40 of the dense tap switching means 30 makes one rotation.
[0005]
8 and 9 are a side partial sectional view and a plan view showing a drive mechanism of a conventional tap switching device as disclosed in Japanese Utility Model Laid-Open No. 58-10324, for example. FIG. 10 is a perspective view of the insulating cylinder in which the coarse tap switching means 20 and the auxiliary switching means 34 are installed. The fixed contacts 101K, 101L, and 102K of the auxiliary switching means 34, the terminal K1 of the movable contact 42, and the coarse switching are shown. The arrangement of the fixed contacts 101, 102, 103 of the tap switching means 20 and the terminal O1 of the movable contact 41 on the insulating cylinder 70 for one phase is shown.
[0006]
8 and 9, the drive lever 46 is fixed to the lower end portion 44 a of the input shaft 44, and is rotated in the direction indicated by the arrow A in FIG. 9 by the rotation of the input shaft 44. Below the drive lever 46, first and second rotary disks 52, 52K are rotatably provided symmetrically with respect to the central axis of the input shaft 44. First and second gears 51 and 51K are provided on the upper surfaces of the rotary disks 52 and 52K, and first, second, third and fourth protrusions 541, 542, 54K2 and 54K1 having rollers on the lower surface. Each is provided. Below the input shaft 44, first and second Geneva gears 56 and 56K are provided independently of each other and rotatable about the input shaft 44, respectively. Output shafts 58 and 58K are fixed to the Geneva gears 56 and 56K, respectively. Each Geneva gear 56, 56K has two grooves 60, 61 and 60K, 61K, respectively. The drive shaft lever 46 is provided with a plurality of pins 48 that engage with the teeth of the gears 51 and 51K and rotate the gears 51 and 51K.
FIG. 11 is a contact position table showing contact positions at each tap position.
[0007]
Next, the switching operation will be described.
FIG. 9 shows the maximum tap state in which the coarse tap switching means 20, the fine tap switching means 30 and the auxiliary switching means 34 are switched to the state at the tap position No. 1, for example, the state shown in FIG. When switching from this state to the tap position No. 2, the drive shaft 38 is rotated by a unit angle (36 degrees), and the movable contact 40 of the dense tap switching means 30 fixed to the drive shaft 38 makes contact with the fixed contact 11. The contact is released to the adjacent fixed contact 12. At this time, the rotation of the drive shaft 38 is transmitted to the drive lever 46 via the input shaft 44, and the drive lever 46 is rotated by a unit angle (36 degrees) in the direction of the arrow in FIG. Furthermore, switching from No. 2 to No. 3, No. 3 to No. 4, and No. 4 to No. 5 is continued.
[0008]
Further, when switching from No. 5 to No. 6, the pin 48 provided on the drive lever 46 rotates while engaging with the second gear 51K on the left side in the drawing. At this time, the pin 48 acts as a transmission means, and the second gear 51K and the second rotating disk 52K are half rotated. Due to the half rotation of the second rotating disk 52K, the fourth protrusion 54K1 is engaged with the groove 60K of the second Geneva gear 56K, and the output shaft 58K fixed to the second Geneva gear 56K is the movable contact of the auxiliary switching means 34. 42 is moved from the fixed contact 101K to 101L and brought into contact therewith.
When the drive shaft 38 continues to rotate, when the tap position No. 10 switches to No. 11, the pin 48 provided on the drive lever 46 rotates while engaging with the first gear 51 on the right side in FIG. To do. As a result, the first gear 51 and the first rotating disk 52 are rotated halfway, and the first protrusion 541 engages with the groove 60 of the first Geneva gear 56 to rotate the first Geneva gear 56 by a predetermined angle. The output shaft 58 fixed to the first Geneva gear 56 is also rotated by a predetermined angle, and the movable contact 41 of the coarse tap switching means 20 fixed to the output shaft 58 is switched from the fixed contact 101 to the fixed contact 102. At this time, the movable contact 40 of the dense tap switching means 30 is in contact with the auxiliary fixed contact K, and no current flows through the coarse tap switching means 20. Further, by rotating the drive lever 46 via the drive shaft 38, the tap can be switched to the tap position 25 in the order shown in FIG.
[0009]
However, although there is still a margin at the contact point of the fine tap switching means 30, it is possible to switch only to tap position No. 25. The reason for this is that if the tap position No. 25 is switched to the next tap position, the pin 48 provided on the drive lever 46 engages with the second gear 51K, and the second gear 51K and the second gear 51K. The rotary disk 52K is rotated half a turn. The rotation of the second rotating disk 52K causes the fourth protrusion 54K1 to engage with the groove 60K of the Geneva gear 56K and rotate the second Geneva gear 56K by a predetermined angle. As a result, the movable contact 42 of the auxiliary switching means 34 that has already been switched to the fixed contact 102K is detached from the fixed contact 102K through the rotation of the output shaft 58K.
Expressing this in general, the number of fixed contacts including the auxiliary fixed contact K of the dense tap switching means 30 is N (here 10), and the number of fixed contacts of the coarse tap winding 20 is n (here 3). In theory, a tap position of (N × n−1) can be ensured. However, in the conventional tap switching device as described above, the number of tap positions that can be switched is (N × n−N / 2).
[0010]
[Problems to be solved by the invention]
Since the conventional tap switching device is configured as described above, the fixed contacts provided in the dense tap switching means cannot be fully utilized, and the number of tap positions is limited to (N × n−N / 2). There was a problem that. In the configuration of the conventional tap switching device, it is possible to increase the number of tap positions to (N × n−1) by adding one additional fixed contact to the auxiliary switching means. This is unreasonable because it is necessary to secure a new location for the fixed contact, which increases the diameter of the insulating cylinder to which the fixed contact is attached and increases the cost.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a tap changer that can increase the number of tap positions without increasing the number of contacts.
[0011]
[Means for Solving the Problems]
A tap switching device for an electrical equipment winding according to claim 1,
A drive shaft rotated by a predetermined unit angle;
The first movable contact, the auxiliary fixed contact, and the first fixed contact connected to the close-tapped winding have a first movable contact and each first fixed contact or auxiliary fixed by rotating the drive shaft for each unit angle. Dense tap switching means for switching contact with any of the contacts;
A drive lever that rotates in conjunction with the drive shaft;
A first rotating body having first and second protrusions, provided independently of the drive lever, engaged with the drive lever at a specific position of the drive lever, and rotated by its rotation;
First switching means driven by a first rotating body;
A second movable contact and a second fixed contact having a second fixed contact connected to the coarse tap winding and a second movable contact connected to the dense tap winding and driven by the first switching means. Coarse tap switching means for switching contact with
A second rotating body that has a third protrusion and is provided independently of the drive lever, is engaged with the drive lever at a specific position of the drive lever, and is rotationally driven by its rotation;
Second switching means driven by the second rotating body;
The third fixed contact connected to the coarse tap winding and the third movable contact connected to the auxiliary fixed contact of the fine tap switching means have the third movable contact and the second movable contact driven by the second switching means. Auxiliary switching means for switching contact with the three fixed contacts,
When switching from the state in which the first movable contact of the dense tap switching means is in contact with the auxiliary fixed contact to contact with the adjacent first fixed contact, and when the first movable contact is in contact with the adjacent first fixed contact When the state is switched from the state to the state in contact with the auxiliary fixed contact, the first or second protrusion of the first rotating body engages with the first switching means and is driven,
Only when the second movable contact of the first switching means is connected to the intermediate tap of the coarse tap winding, the third protrusion of the second rotating body is engaged with and driven by the second switching means, In the state where the second movable contact is connected to the winding end tap of the coarse tap winding, the second rotating body is disengaged from the second switching means.
[0012]
The electrical equipment winding tap switching device according to claim 2 is the one according to claim 1,
The drive lever has a plurality of pins provided within a unit angle;
The first and second rotating bodies are provided symmetrically with respect to the central axis of the drive shaft,
The first rotating body has a first gear rotated by a pin of the drive lever and a first rotating disk rotating in conjunction with the first gear,
The first and second protrusions are provided symmetrically with respect to the central axis of the first rotating disk,
A second rotating body having a second gear rotated by a pin of the drive lever and a second rotating disk rotating in conjunction with the second gear;
A third protrusion is provided on the second rotating disk;
The first switching means has a first Geneva gear in which a groove for engaging the first and second protrusions is formed;
The second switching means has a second Geneva gear that is formed with a groove that engages with the third projection and that is driven concentrically and independently of the first Geneva gear.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a connection diagram of a tap switching device according to an embodiment of the present invention. In FIG. 1, a terminal 2 connected to a line side of a winding of an electric device such as a transformer has a coarse tap winding 1 including a main winding 4 and first and second coarse tap windings 6 and 8. Are connected in series. 20 is a coarse tap switching means, 101 to 103 are fixed contacts of the coarse tap switching means 20 as second fixed contacts, and 41 is a movable contact of the coarse tap switching means 20 as a second movable contact. is there. A connection point tap 26 between the main winding 4 and the first coarse tap winding 6 is connected to the fixed contact 103 of the coarse tap switching means 20 between the first coarse tap winding 6 and the second coarse tap winding 8. In other words, the intermediate tap 24 of the coarse tap winding 1 is connected to the fixed contact 102, and the end tap 22 of the second coarse tap winding 8 is connected to the fixed contact 101.
The coarse tap switching means 20 switches the taps 22, 24, and 26 by switching the contact between the movable contact 41 and the fixed contacts 101, 102, and 103. A dense tap winding 28 is connected in series to the movable contact 41 of the coarse tap switching means 20.
[0014]
30 is a fine tap switching means, 11 to 19 are fixed contacts of the fine tap switching means 30 as first fixed contacts, K is an auxiliary fixed contact, and 40 is a fine tap switching as a first movable contact. It is a movable contact of the means 30. Each tap of the dense tap winding 28 is connected to each fixed contact 11 to 19 of the dense tap switching means 30. The common connection terminal 32 of the dense tap switching means 30 is connected to the neutral point side of the electrical equipment winding.
The fine tap switching is performed by switching the connection between the movable contact 40 of the fine tap switching means 30 and the fixed contacts 11 to 19. The rough tap switching means 20 performs rough tap switching and the fine tap switching means 30 performs fine tap switching. By combining the coarse tap switching means 20 and the fine tap switching means 30, a multi-stage tap switching can be performed as a whole.
[0015]
Reference numeral 34 denotes auxiliary switching means, 101K and 102K are fixed contacts of the auxiliary tap switching means 34 as third fixed contacts, and 42 is a movable contact of the auxiliary tap switching means 34 as a third movable contact. . The fixed contacts 101K and 102K are connected to the taps 22 and 24 of the coarse tap winding 1, respectively.
The fine tap switching means 30 has a structure capable of continuously performing tap switching without interrupting the load current. On the other hand, since the coarse tap switching means 20 has a large voltage difference between taps when switching taps, switching is difficult when a load current is passed through the contacts. Therefore, when the coarse tap switching is performed, the movable contact 40 is once connected to the auxiliary fixed contact K by the fine tap switching means 30 and the coarse tap switching means 20 is turned off before the coarse tap switching is performed. At this time, the current supply to the load is performed through the auxiliary switching means 34 connected in parallel to the coarse tap switching means 20, so that the power supply to the load is not interrupted.
[0016]
The configuration of the tap switching device according to one embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a plan view showing the configuration of the drive mechanism of the tap switching device, and FIG. 3 is a side partial sectional view thereof.
The overall arrangement of each member is the same as in the conventional example, and will be described with reference to FIG. In FIG. 7, the worm wheel 36 is rotationally driven by a driving means (not shown). A movable contact 40 of the dense tap switching means 30 is fixed to a drive shaft 38 coaxial with the rotating shaft of the worm wheel 36, and fixed contacts 11 to 19 and auxiliary fixed contacts K (in FIG. Only 12 and 17 are shown). Tap switching is performed by rotating the worm wheel 36 by a unit angle (in this case, 36 degrees). Below the drive shaft 38, a drive mechanism 80 for driving the coarse tap switching means 20 and the auxiliary switching means 34 via the input shaft 44 is provided. The rotational force of the worm wheel 36 is transmitted to the drive mechanism 80 via the drive shaft 38 and the input shaft 44. That is, the coarse tap switching means 20 and the auxiliary switching means 34 are operated in response to the operation in which the movable contact 40 of the dense tap switching means 30 makes one rotation.
[0017]
Next, the drive mechanism will be described with reference to FIGS. A drive lever 46 is fixed to the lower end 44 a of the input shaft 44, and is rotated in the direction indicated by the arrow A in FIG. A plurality of pins 48 are implanted in the drive lever 46. Below the drive lever 46, first and second rotating bodies 50 and 50K are provided independently of each other. These are separated by 180 degrees with respect to the central axis of the drive shaft 38, that is, the central axis of the input shaft 44. That is, they are arranged symmetrically. The first rotating body 50 includes a first gear 51 that engages with the pin 48 of the drive lever 46 and a first rotating disk 52 that rotates in conjunction with the first gear 51, and the second rotating body. Similarly, 50K comprises a second gear 51K that engages with the pin 48 and a second rotating disk 52K that rotates in unison with the second gear 51K.
[0018]
The pin 48 of the drive lever 46 is engaged with the first or second gear 51, 51K only in a specific position of the drive lever 46, that is, when the drive lever 46 is at the position of the first or second rotating body 50, 50K. It comes to match. Further, since the plurality of pins 48 are arranged within a unit angle (36 degrees), the engagement is released by rotation for one tap.
[0019]
First and second protrusions 541 and 542 (two protrusions) having rollers are provided on the lower surface of the first rotating disk 52, and a third roller having rollers on the lower surface of the second rotating disk 52K. A protrusion 52K2 (one protrusion) is provided. Below the input shaft 44, first and second geneva gears 56 and 56K as first and second switching means are provided independently of each other and rotatable about the input shaft 44, respectively. . Output shafts 58 and 58K are fixed to the Geneva gears 56 and 56K, respectively. Each Geneva gear 56, 56K has two grooves 60, 61 and 60K, 61K, respectively.
[0020]
FIG. 4 is a perspective view of an insulating cylinder in which the coarse tap switching means 20 and the auxiliary switching means 34 are installed. The fixed contacts 101K and 102K of the auxiliary switching means 34, the terminal K1 of the movable contact 42, and the coarse tap switching means. The arrangement of 20 fixed contacts 101, 102, 103 and the terminal O1 of the movable contact 41 on the insulating cylinder 70 for one phase is shown.
FIG. 5 is a contact position table showing contact positions at each tap position. According to this embodiment, tap positions from No. 1 to No. 29 can be selected as shown in FIG.
The operation will be described below with reference to FIGS.
[0021]
FIG. 2 shows a state in the case of tap position No.1. That is, the maximum tap state in which the switching means 20, 30 and 34 are switched as shown in FIG. When switching from this state to the tap position No. 2, the drive shaft 38 is rotated by a unit angle (36 degrees in this case), and the movable contact 40 of the fine tap switching means 30 is released from contact with the contact 11 and contacts the contact 12. Is done. At this time, the rotation of the drive shaft 38 is transmitted to the drive lever 46 via the input shaft 44, and the drive lever 46 is also rotated by a unit angle (36 degrees) in the direction indicated by the arrow A in FIG. That is, since the pin 48 provided on the drive lever 46 moves away from the first gear 51, the first rotating disk 52 integrated with the first gear 51 is not rotated. At the same time, the first Geneva gear 56 is not rotated, and the coarse tap switching means 20 connected thereto is not switched.
[0022]
Furthermore, switching from No. 2 to No. 3, No. 3 to No. 4, and No. 4 to No. 5 is continued. Further, when switching from No. 5 to No. 6, the pin 48 provided on the drive lever 46 rotates while engaging with the second gear 51K on the left side in FIG. At this time, the pin 48 acts as a transmission means, and the second gear 51K and the second rotating disk 52K are rotated halfway in the direction of arrow B in FIG. 2, but a protrusion is formed on one side of the second rotating disk 52K. Therefore, the movable contact 42 of the auxiliary switching means 34 that does not engage with the groove 60K of the second Geneva gear 56K and is connected to the output shaft 58K fixed to the second Geneva gear 56K does not move. At this time, the third protrusion 54K2 installed on the second rotating disk 52K rotates 180 degrees simultaneously with the second rotating disk 52K in the direction of arrow B in FIG.
[0023]
If the drive shaft 38 continues to rotate, when the tap position No. 10 switches to No. 11, the pin 48 provided on the drive lever 46 rotates while engaging with the first gear 51 on the right side in FIG. To do. As a result, the first gear 51 and the first rotating disk 52 are rotated halfway, and the first protrusion 541 engages with the groove 60 of the first Geneva gear 56 to rotate the first Geneva gear 56 by a predetermined angle. The output shaft 58 fixed to the first Geneva gear 56 is also rotated by a predetermined angle, and the movable contact 41 of the coarse tap switching means 20 fixed to the output shaft 58 is switched from the fixed contact 101 to the fixed contact 102. At this time, the movable contact 40 of the dense tap switching means 30 is in contact with the auxiliary fixed contact K, and no current flows through the coarse tap switching means 20. That is, the switching timing is such that the coarse tap switching means 20 first switches from the fixed contact 101 to the fixed contact 102, and then the fine tap switching means 30 switches from the auxiliary fixed contact K to the fixed contact 11.
[0024]
When the drive shaft 38 continues to rotate, when the tap position No. 15 is switched to No. 16, the pin 48 provided on the drive lever 46 rotates while being engaged with the second gear 51K. At this time, the pin 48 acts as a transmission means, and the second gear 51K and the second rotating disk 52K are half rotated. Due to the half rotation of the second rotating disk 52K, the third protrusion 54K2 engages with the groove 60K of the second Geneva gear 56K, and the output shaft 58K fixed to the second Geneva gear 56K is the movable contact of the auxiliary switching means 34. 42 is moved from the fixed contact 101K to the fixed contact 102K and brought into contact therewith.
At this time, of course, no current flows through the auxiliary switching means 34.
[0025]
When the drive shaft 38 continues to rotate, the pin 48 provided on the drive lever 46 rotates while engaging with the first gear 51 when the tap position No. 20 switches to No. 21. As a result, the first gear 51 and the first rotating disk 52 rotate halfway, and the second protrusion 542 engages with the groove 61 of the first Geneva gear 56 to rotate the first Geneva gear 56 by a predetermined angle. The output shaft 58 fixed to the first Geneva gear 56 is also rotated by a predetermined angle, and the movable contact 41 of the coarse tap switching means 20 fixed to the output shaft 58 is switched from the fixed contact 102 to the fixed contact 103. At this time, the movable contact 40 of the dense tap switching means 30 is in contact with the auxiliary fixed contact K, and no current flows through the coarse tap switching means 20. That is, at this position, first, the coarse tap switching means 20 switches from the fixed contact 102 to the fixed contact 103, and then the fine tap switching means 30 switches from the auxiliary fixed contact K to the fixed contact 11.
[0026]
When switching from No. 25 to No. 26, the pin 48 provided on the drive lever 46 rotates while engaging with the second gear 51K. At this time, the pin 48 acts as a transmission means, and the second gear 51K and the second rotating disk 52K are rotated halfway, but since there is no protrusion on one side of the second rotating disk 52K, the second Geneva gear 56K. The movable contact 42 of the auxiliary switching means 34 that is connected to the output shaft 58K that is not engaged with the groove 60K and is fixed to the second Geneva gear 56K does not move.
Accordingly, since the movable contact of the auxiliary switching means 34 does not move, the movable contact 42 remains in contact with the fixed contact 102K, and the tap position can be switched to No. 29.
[0027]
When switching from the tap position 29 toward the tap position 1, tap switching is performed with the reverse movement to that described above. When switching from the tap position 21 to 20 and from the tap position 11 to 10, the fine tap switching means 30 first switches from the fixed contact 11 to the auxiliary fixed contact K, and then the coarse tap switching means 20 fixes the fixed contact. Switching from 103 to 102 or from fixed contact 102 to 101 is performed. Therefore, no current flows through the coarse tap switching means 20 at any coarse tap changeover.
[0028]
【The invention's effect】
According to the present invention, since the second rotating body drives the second switching means only in a state where the second movable contact is connected to the intermediate tap of the coarse tap winding, the auxiliary is supported between the maximum and minimum tap positions. The tap switching means is switched only once, and therefore the number of tap positions can be increased without the third movable contact being disengaged from the third fixed contact.
[Brief description of the drawings]
FIG. 1 is a connection diagram of a tap switching device for an electric device according to an embodiment of the present invention.
2 is a plan view showing a drive mechanism of the tap switching device of FIG. 1; FIG.
3 is a side partial cross-sectional view of the drive mechanism of FIG. 2;
4 is a perspective view of an insulating cylinder of the tap switching device of FIG. 1. FIG.
FIG. 5 is a contact position table of the tap switching device of FIG. 1;
FIG. 6 is a connection diagram of a conventional tap switching device of an electric device.
FIG. 7 is a cross-sectional view showing a general configuration of a tap switching device.
8 is a side partial sectional view showing a drive mechanism of the tap switching device of FIG. 6;
9 is a plan view of the drive mechanism of FIG. 8. FIG.
10 is a perspective view of an insulating cylinder of the tap switching device of FIG. 6. FIG.
FIG. 11 is a contact position table of the tap switching device of FIG. 6;
[Explanation of symbols]
1 Coarse tap winding,
101-103, 101K, 102K, 11-19 fixed contact,
20 coarse tap switching means, 24 intermediate tap, 28 fine tap winding,
30 fine tap switching means, 34 auxiliary switching means, 38 drive shaft,
40, 41, 42 Movable contact, 46 Drive lever, 48 pins,
50 first rotating body, 50K second rotating body, 51 first gear,
51K second gear, 52 first rotating disk, 52K second rotating disk,
541 first protrusion, 542 second protrusion, 54K2 third protrusion,
56 1st Geneva gear, 56K 2nd Geneva gear, 61, 61K groove,
K Auxiliary fixed contact.

Claims

In a tap switching device for switching taps of electrical equipment windings having a dense tap winding and a coarse tap winding having an intermediate tap,
A drive shaft rotated by a predetermined unit angle;
A first movable contact, an auxiliary fixed contact, and a first fixed contact connected to the dense tap winding, and the first movable contact and each first fixed contact by rotation of the drive shaft per unit angle Or a dense tap switching means for switching contact with any of the auxiliary fixed contacts;
A drive lever that rotates in conjunction with the drive shaft;
A first rotating body having first and second protrusions, provided independently of the drive lever, engaged with the drive lever at a specific position of the drive lever, and rotated by the rotation;
First switching means driven by the first rotating body;
A second fixed contact connected to the coarse tap winding and a second movable contact connected to the dense tap winding have a second movable contact and a second movable contact driven by the first switching means. Coarse tap switching means for switching contact with the two fixed contacts;
A second rotating body that has a third protrusion and is provided independently of the drive lever, engages with the drive lever at a specific position of the drive lever, and is rotated by the rotation; and Second switching means driven by a rotating body;
The third fixed contact connected to the coarse tap winding and the third movable contact connected to the auxiliary fixed contact of the fine tap switching means have the third movable contact and are driven by the second switching means to cause the third Auxiliary switching means for switching the contact between the movable contact and the third fixed contact;
When switching from the state where the first movable contact of the dense tap switching means is in contact with the auxiliary fixed contact to contact the adjacent first fixed contact, and when the first movable contact is the adjacent first When switching from the state in contact with the fixed contact to the state in contact with the auxiliary fixed contact, the first or second protrusion of the first rotating body is engaged with and driven by the first switching means. As well as
The third protrusion of the second rotating body engages with the second switching means only in a state where the second movable contact of the first switching means is connected to the intermediate tap of the coarse tap winding. And when the second movable contact is connected to the winding end tap of the coarse tap winding, the second rotating body is disengaged from the second switching means. A tap switching device for electrical equipment windings.

The drive lever has a plurality of pins provided within a unit angle, and the first and second rotating bodies are provided symmetrically with respect to the central axis of the drive shaft,
The first rotating body has a first gear rotated by a pin of the drive lever and a first rotating disk rotating in conjunction with the first gear;
The first and second protrusions are provided symmetrically with respect to the central axis of the first rotating disk,
The second rotating body has a second gear that is rotated by a pin of the drive lever and a second rotating disk that rotates in conjunction with the second gear;
A third protrusion is provided on the second rotating disk;
The first switching means has a first Geneva gear in which a groove that engages with the first and second protrusions is formed,
The second switching means includes a second Geneva gear that is formed with a groove that engages with the third protrusion and that is driven concentrically and independently of the first Geneva gear. Tap switching device for electrical equipment windings.