JP2009054714A

JP2009054714A - Transformer

Info

Publication number: JP2009054714A
Application number: JP2007218683A
Authority: JP
Inventors: Makoto Shinohara; 誠篠原; Masanao Kuwabara; 正尚桑原; Toru Honma; 徹本間; Hiroyuki Endo; 博之遠藤; Yuji Sato; 裕二佐藤
Original assignee: Hitachi Industrial Equipment Systems Co Ltd
Current assignee: Hitachi Industrial Equipment Systems Co Ltd
Priority date: 2007-08-24
Filing date: 2007-08-24
Publication date: 2009-03-12
Anticipated expiration: 2027-08-24
Also published as: JP4857221B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transformer small in deformation of a winding by electromagnetic mechanical force, and composed by reducing the size and weight thereof, and improving a characteristic. <P>SOLUTION: This transformer is structured such that a connection member is formed into a shape where its ends are bent, and the bent parts are bent to the inner side relative to the outermost part of the connection member, and arranged along a core outer peripheral part; and bolts of connection parts are arranged on inner sides relative to the outermost parts of the connection member. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は変圧器に係り、特に、短絡事故の発生時に巻線が電磁機械力により変形するのを防止する構成に関する。 The present invention relates to a transformer, and more particularly to a configuration for preventing a winding from being deformed by an electromagnetic mechanical force when a short circuit accident occurs.

従来、巻線に働く電磁機械力に対しては、特許文献１に記載されているのように、巻線の組み込まれた鉄心と、この上下に設けられた締め金具と、この締め金具に連結する巻線補強金具を備えて、前記巻線補強金具により前記巻線の側面を押さえるようにして、短絡事故発生時の巻線の外側への変形を防止するように、対策がとられていた。変形防止作用としては図３を用いて説明すると、巻線２に作用する矢印方向の電磁機械力は、巻線補強金具５で受け、この力を上下の締め金具３，４に伝える。 Conventionally, with respect to the electromagnetic mechanical force acting on the winding, as described in Patent Document 1, the iron core in which the winding is incorporated, the fasteners provided above and below, and the fasteners are connected. In order to prevent deformation to the outside of the winding at the time of occurrence of a short-circuit accident, the winding reinforcing bracket is provided, and the winding reinforcing bracket is pressed against the side surface of the winding. . The deformation preventing function will be described with reference to FIG. 3. The electromagnetic mechanical force acting on the winding 2 in the direction of the arrow is received by the winding reinforcing metal fitting 5 and transmitted to the upper and lower fasteners 3, 4.

特開昭５９−７２７０９号公報JP 59-72709 A

上記従来技術では、上下の締め金具３，４の両端が巻線２の側面の上下に位置しており、この両端にボルト７により補強金具５を強固に固定され、この補強金具５でコイル２に作用する外側への電磁機械力を支える。しかしながら、この電磁機械力を支えるとき、補強金具５が図３に破線８で示すように、締め金具両端の上下のボルト７を支点として変形することになり、上下にボルトが離れている程、大きく変形するという問題がある。 In the above prior art, both ends of the upper and lower fasteners 3, 4 are positioned above and below the side surface of the winding 2, and the reinforcing bracket 5 is firmly fixed to both ends by bolts 7. Supports the external electromagnetic mechanical force acting on. However, when supporting this electromagnetic mechanical force, the reinforcing bracket 5 will be deformed with the upper and lower bolts 7 at both ends of the fastener as fulcrums, as shown by the broken line 8 in FIG. There is a problem of significant deformation.

また、上下の締め金具３，４が巻線２の側面付近まで直線形状に伸びており、補強金具５を固定するボルト７が更に外側に突出した構造となっているため、締め金具の形状が大型となって油入り変圧器の場合、収納するタンクが広がり、油量増大、質量増大の原因になる。 In addition, since the upper and lower fasteners 3 and 4 extend in a straight line shape to the vicinity of the side surface of the winding 2 and the bolt 7 for fixing the reinforcing metal fitting 5 projects further outward, the shape of the fastener is In the case of an oil-filled transformer with a large size, the tank to be accommodated spreads, causing an increase in the amount of oil and an increase in mass.

本発明は、上記従来技術の状況に鑑み、電磁機械力による巻線の変形が小さく、しかも小型化と重量の低減化と特性の向上を図った変圧器を提供することを目的とする。 An object of the present invention is to provide a transformer in which the deformation of the winding due to the electromagnetic mechanical force is small, and the size is reduced, the weight is reduced, and the characteristics are improved.

上記課題点を解決するために、本発明は、磁路を形成する環状のコアと、上記コアに巻装されたコイルからなる変圧器本体が支持部材で支持される変圧器であって、上記支持部材が上記コアの天頂部の上方に配され該天頂部を覆う上部片と、上記コアの底部側に配され該コアの底部を支持する下部片と、上記上部片と上記下部片との両側面部の間を連結する連結部材を備えてことを特徴とする。 In order to solve the above-mentioned problems, the present invention is a transformer in which a transformer body including an annular core that forms a magnetic path and a coil wound around the core is supported by a support member, An upper piece that is disposed above the top of the core and covers the top, a lower piece that is arranged on the bottom of the core and supports the bottom of the core, and the upper piece and the lower piece It is characterized by comprising a connecting member for connecting both side portions.

本発明によれば、電磁機械力による巻線の変形が小さく、変圧器の小型化、重量低減化と特性の向上を図ることが出来る。 According to the present invention, the deformation of the winding due to the electromagnetic mechanical force is small, and the transformer can be reduced in size, weight, and characteristics can be improved.

以下、本発明の実施例につき、図１、２面を用いて説明する。図１は、変圧器の正面図、図2は、図１の変圧器における作用の説明図である。本実施例では、変圧器が油入変圧器である場合につき説明する。 Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a front view of the transformer, and FIG. 2 is an explanatory view of the operation of the transformer of FIG. In this embodiment, the case where the transformer is an oil-filled transformer will be described.

図１において、１００は、本発明の実施例としての油入変圧器、１０はタンク、１は、油入変圧器１００の変圧器本体において磁路を形成する環状のコア、２ａ、２ｂはそれぞれ、コア１の両脚部に巻装され、該コア１とともに変圧器本体を構成するコイルである。コイル２ａ、２ｂはそれぞれ内側に巻回される内側コイルと、その外側に卷回される外側コイルから構成される。また、３は、コア１の天頂部１ａの上方に配されコ字状断面の箱型を有して該天頂部１ａを覆う上部片、４は、コア１の底部１ｂ側に配されコ字状断面の箱型を有して該底部１ｂを支持する下部片である。 In FIG. 1, 100 is an oil-filled transformer as an embodiment of the present invention, 10 is a tank, 1 is an annular core that forms a magnetic path in the transformer body of the oil-filled transformer 100, and 2a and 2b are respectively These coils are wound around both leg portions of the core 1 and constitute a transformer body together with the core 1. Each of the coils 2a and 2b includes an inner coil wound inward and an outer coil wound outward. Further, 3 is an upper piece that is arranged above the zenith portion 1a of the core 1 and has a box shape with a U-shaped cross section and covers the zenith portion 1a, and 4 is arranged on the bottom 1b side of the core 1 and is U-shaped. It is a lower piece that has a box shape with a cross section and supports the bottom 1b.

５ａ、５ｂは、板状で折り曲げ加工された連結部材であって、上記コイル２ａ、２ｂの外側にあって上記コア１の幅方向の平面（ＹＺ平面）に沿って配され、上記上部片３と上記下部片４の上記他方の２個の側面部との間を跨って連結する。6ａは、連結部材５ａを上部片３に結合するボルト、6ｂは、連結部材５ｂを上部片３に結合するボルト、６ｃは、連結部材５aを下部片４に結合するボルト、６dは、連結部材５ｂを下部片４に結合するボルトである。上記上部片３、上記下部片４、上記連結部材５ａ、５ｂ及び、上記ボルトは、変圧器本体を支持する支持部材を構成する。 Reference numerals 5a and 5b denote plate-like connecting members which are bent and arranged on the outside of the coils 2a and 2b along the plane in the width direction of the core 1 (YZ plane). And the other two side portions of the lower piece 4 are connected to each other. 6a is a bolt for connecting the connecting member 5a to the upper piece 3, 6b is a bolt for connecting the connecting member 5b to the upper piece 3, 6c is a bolt for connecting the connecting member 5a to the lower piece 4, and 6d is a connecting member. It is a bolt for connecting 5b to the lower piece 4. The upper piece 3, the lower piece 4, the connecting members 5a and 5b, and the bolt constitute a support member that supports the transformer body.

本実施例では、上記連結部材５ａ、５ｂが折り曲げ部５ａ１、５ａ２、５ｂ１、５ｂ２を有し、これら折り曲げ部は、該連結部材５ａ、５ｂ最外部から内側に、該コア1外周部に沿うよう折り曲げられた形状とし、その端部は連結部にてボルト６ａ、６ｂ、６ｃ、６ｄで上部片３及び、下部片４に固定される。また、上部片３及び、下部片４のＸ方向の長さＬ１はコイル最外部長さＬ２よりも短く構成され、上部片３、下部片４及び、連結部材５ａ、５ｂを結合した状態で、コイル中央部に接している該連結部材５ａ、５ｂの中間部位５ａ３、５ｂ３が中身支持材の最外部となる構成である。 In the present embodiment, the connecting members 5a and 5b have bent portions 5a1, 5a2, 5b1 and 5b2, and these bent portions extend from the outermost part of the connecting members 5a and 5b to the inside of the core 1 outer periphery. A bent shape is formed, and an end portion thereof is fixed to the upper piece 3 and the lower piece 4 with bolts 6a, 6b, 6c, and 6d at the connecting portion. Further, the length L1 in the X direction of the upper piece 3 and the lower piece 4 is configured to be shorter than the outermost length L2 of the coil, and the upper piece 3, the lower piece 4 and the connecting members 5a and 5b are coupled. The intermediate portions 5a3 and 5b3 of the connecting members 5a and 5b that are in contact with the coil central portion are configured to be the outermost part of the content support material.

以下、説明中で用いる図２中の構成要素には、図１の場合と同じ符号を付して用いる。図２は、図１の油入変圧器１００における本発明の効果を示す説明図である。 In the following description, the components in FIG. 2 used in the description are used with the same reference numerals as in FIG. FIG. 2 is an explanatory view showing the effect of the present invention in the oil-filled transformer 100 of FIG.

変圧器短絡事故時にはコイル２ａ、２ｂはそれぞれ内側コイルと外側コイル間の反発力によりＸ方向外側に広がろうとする電磁機械力Ａが働く（図２では、コイル２ｂについてのみ矢印で示す。）。本実施例では、連結部材の折り曲げ部５ａ１、５ａ２、５ｂ１、５ｂ２を該コア1外周部に沿うよう折り曲げられた形状として、機械力Ａを受けるように構成される。これらの折り曲げ部５ａ１、５ａ２、５ｂ１、５ｂ２に受ける機械力は、引っ張り力Ｂとして表され、水平方向（ＸＹ平面）に対する上記折り曲げ部の角度θにより分力された値となり（Ｂ＝Ａ・ｃｏｓθ）、直接の機械力Ａより小さくて済む。 In a transformer short-circuit accident, the coils 2a and 2b are each subjected to an electromagnetic mechanical force A that attempts to spread outward in the X direction by the repulsive force between the inner coil and the outer coil (in FIG. 2, only the coil 2b is indicated by an arrow). In this embodiment, the bending portions 5a1, 5a2, 5b1, 5b2 of the connecting member are configured to receive the mechanical force A as a shape bent along the outer peripheral portion of the core 1. The mechanical force applied to these bent portions 5a1, 5a2, 5b1, and 5b2 is expressed as a pulling force B, and is a value divided by the angle θ of the bent portion with respect to the horizontal direction (XY plane) (B = A · cos θ). ), Less than the direct mechanical force A.

また、折り曲げ部５ａ１、５ａ２、５ｂ１、５ｂ２に対し、鉛直方向の力も分力され、固定ボルト6ａ、6b、6c、6dを支点とした、金具を変形させる曲げモーメントが低減される。 In addition, a vertical force is also applied to the bent portions 5a1, 5a2, 5b1, and 5b2, and a bending moment that deforms the metal fitting using the fixing bolts 6a, 6b, 6c, and 6d as fulcrums is reduced.

従って、本構造により、上部片３、下部片４及び連結部材５ａ、５ｂに加わる力が少なくて済むため、上下部片３，４の質量を低減でき、連結部材５ａ、５ｂも簡素化されることにより、全体の質量を低減できる。そして、上記のように上下部片と連結部材が簡素化されるので、金具内に発生する漂遊損（渦電流による損失）を低減できるため、変圧器の特性が向上する。 Therefore, with this structure, since the force applied to the upper piece 3, the lower piece 4 and the connecting members 5a and 5b can be reduced, the mass of the upper and lower pieces 3 and 4 can be reduced, and the connecting members 5a and 5b are also simplified. As a result, the entire mass can be reduced. Since the upper and lower pieces and the connecting member are simplified as described above, stray loss (loss due to eddy current) generated in the metal fitting can be reduced, and the characteristics of the transformer are improved.

更に、従来構造のような、直線状の連結部５ａ、５ｂを固定ボルトで固定する場合にはボルトが連結部材５ａ、５ｂよりＸ方向外側に突出するため、その部位が中身支持材の最外部となる。一方、本実施例では、中身支持材の最外部が上記連結部材５ａ、５ｂの最外部であり、固定ボルト６ａ、６ｂ、６ｃ、６ｄが外側に突出しないため、タンク１０を縮小することができ、質量、油量を低減できる。 Further, when the linear connecting portions 5a and 5b are fixed with fixing bolts as in the conventional structure, the bolt protrudes outward in the X direction from the connecting members 5a and 5b, so that portion is the outermost part of the content support material. It becomes. On the other hand, in the present embodiment, the outermost part of the content support material is the outermost part of the connecting members 5a, 5b, and the fixing bolts 6a, 6b, 6c, 6d do not protrude outward, so that the tank 10 can be reduced. , Mass and oil amount can be reduced.

また、図２に示すように電磁機械力Ａによりコイル２ｂの側面が変形するが、これに伴って連結部５ａが破線９のように変形する。この破線９の変形は、コイル２ｂの側面の上下の肩部２ｂ１、２ｂ２を支点として発生するが、支点間の距離がコイルの高さであるため、上部片３、下部片４の距離より小さく変形量が少なくて済む。即ち、破線８は従来の変形状態を示すが、支点が上部片３、下部片４に取り付けたボルトとなるため、支点間の距離が大きく変形量も大きくなる。 Further, as shown in FIG. 2, the side surface of the coil 2 b is deformed by the electromagnetic mechanical force A, and accordingly, the connecting portion 5 a is deformed as indicated by a broken line 9. The deformation of the broken line 9 occurs with the upper and lower shoulders 2b1, 2b2 on the side surface of the coil 2b as fulcrums, but since the distance between the fulcrums is the height of the coil, it is smaller than the distance between the upper piece 3 and the lower piece 4. Less deformation is required. That is, the broken line 8 shows the conventional deformation state, but since the fulcrum is a bolt attached to the upper piece 3 and the lower piece 4, the distance between the fulcrum is large and the deformation amount is also large.

なお、上記実施例においては、変圧器が油入変圧器である場合につき説明したが、本発明は油入変圧器に限定されない。また、変圧器本体を支持する支持部材における上部片３、下部片４、連結部材５ａ、５ｂの結合部をＹＺ平面に垂直としたが、発明はこれに限定されず、ＸＹ平面と垂直であってもよいし、または、ＹＺ平面に対し例えば45℃の角度であっても良い。 In addition, in the said Example, although demonstrated about the case where a transformer was an oil-filled transformer, this invention is not limited to an oil-filled transformer. In addition, although the connecting portion of the upper piece 3, the lower piece 4, and the connecting members 5a and 5b in the support member that supports the transformer main body is perpendicular to the YZ plane, the invention is not limited to this and is perpendicular to the XY plane. Alternatively, the angle may be, for example, 45 ° with respect to the YZ plane.

本発明実施例としての変圧器の正面図である。It is a front view of the transformer as an example of the present invention. 本発明実施例の作用の説明図である。It is explanatory drawing of an effect | action of this invention Example. 従来例の変圧器の正面図である。It is a front view of the transformer of a prior art example.

Explanation of symbols

１…コア、１ａ…コア天頂部、１ｂ…コア底部、２ａ、２ｂ…コイル、３…上部片、４…下部片、５ａ、５ｂ…連結部材、５ａ１、５ａ２、５ｂ１、５ｂ２…連結部材折り曲げ部、５ａ3、５ｂ3…連結部材中間部、６ａ、６ｂ、６c、６d…固定ボルト、１０…タンク、１００…油入変圧器、Ａ…変圧器短絡事故時の機械力、Ｂ…金具引張力、Ｌ１…上部片長さ、下部片長さ、Ｌ２…コイル最外部長さ。 DESCRIPTION OF SYMBOLS 1 ... Core, 1a ... Core top part, 1b ... Core bottom part, 2a, 2b ... Coil, 3 ... Upper piece, 4 ... Lower piece, 5a, 5b ... Connection member, 5a1, 5a2, 5b1, 5b2 ... Connection member bending part 5a3, 5b3: Connecting member intermediate part, 6a, 6b, 6c, 6d ... Fixing bolt, 10 ... Tank, 100 ... Oil-filled transformer, A ... Mechanical force in case of transformer short-circuit accident, B ... Metal fitting tensile force, L1 ... upper piece length, lower piece length, L2 ... coil outermost length.

Claims

A transformer body comprising a ring-shaped core forming a magnetic path and a coil wound around the core and supported by a support member,
An upper piece covering the upper part with the support member disposed above the core;
A lower piece arranged on the bottom side of the core and supporting the bottom of the core;
A connecting member that connects between both side surfaces of the upper piece and the lower piece;
A transformer characterized by comprising.

2. The transformer according to claim 1, wherein the connecting member is bent along the core.

The transformer according to claim 1 or 2, wherein the upper piece has a configuration in which the length is shorter than the outermost length of the coil.

The transformer according to any one of claims 1 to 3, wherein the lower piece is configured to have a length shorter than an outermost length of the coil.

The transformer according to any one of claims 1 to 4, wherein the outermost bolts of the connecting portion and the connecting portion of the upper piece and the lower piece are arranged inside the outermost portion of the connecting member.