JPS62147710A - Winding for induction electric apparatus - Google Patents

Abstract

PURPOSE:To improve the dielectric strength of the entire winding for an induction electric apparatus by using the winding by dipping in an insulating oil, and using a material having a permittivity of the value of 1.3 times or less of that of the oil for insulating paper with which a conductor is covered, rails and spacers. CONSTITUTION:A material having a permittivity of the value of 1.3 times or less of that of an insulating foil is used for insulating paper 3a with which a conductor 3 is covered, rails and spacers 4. The material includes, for example, fluorine resin such as polytetrafluoroethylene, polymethyl benzene, polypropylene, polyethylene, etc. The paper 3a uses, for example, synthetic paper in which plastic film having low permittivity and kraft paper are laminated. Thus, an electric field applied to fine oil gap can be reduced to improve the dielectric strength of the entire winding.

Description

【発明の詳細な説明】 ［従来の技術］ 変圧器、リアクトルなどの誘導電器巻線における導体の
絶縁被覆としては、従来からクラフト紙が主に使用され
ている。変圧器などに使われる鉱油と油浸したクラフト
紙との比誘電率を比較してみると、鉱油が２．２前後で
あるのに対し、油浸紙はその約１．５倍の３．３前後の
値をもつ。このように油に比べて油浸紙の誘電率が高い
ために、油と油浸紙の複合絶縁系においては、油の穴に
より高い電界が加わる。一方、絶縁耐力の上からは油の
方が油浸紙に比べて弱いため、油の絶縁強度が複合絶縁
系全体の絶縁強度を決めてしまっている。DETAILED DESCRIPTION OF THE INVENTION [Prior Art] Kraft paper has conventionally been mainly used as an insulating coating for conductors in windings of induction electric appliances such as transformers and reactors. Comparing the dielectric constant of mineral oil used in transformers and oil-soaked kraft paper, mineral oil has a dielectric constant of around 2.2, while oil-soaked paper has a dielectric constant of 3.5 times, which is about 1.5 times that. It has a value of around 3. Since the dielectric constant of oil-impregnated paper is higher than that of oil, a higher electric field is applied to the oil holes in a composite insulation system of oil and oil-impregnated paper. On the other hand, in terms of dielectric strength, oil is weaker than oil-impregnated paper, so the dielectric strength of oil determines the dielectric strength of the entire composite insulation system.

例えば紙巻導体間の絶縁破壊は、第３図に示す導体３間
のくさび杉油ギャップＧの破壊が引き金になっているこ
とがわかっている。For example, it is known that dielectric breakdown between paper-wrapped conductors is triggered by the breakdown of the wedge cedar oil gap G between the conductors 3 shown in FIG.

これは誘電率の相違から油ギヤツプ部分に浸紙の部分よ
り高い電界が加わるためである。このために、導体３の
被覆３ａとして使用する絶縁紙の比誘電率を低く、例え
ば２．７以下にして油の誘電率に近付け、絶縁強度を向
上させようとすることが特開昭５６−１３４７１９号公
報で提案されている。This is because a higher electric field is applied to the oil gap part than to the paper immersed part due to the difference in dielectric constant. For this reason, it has been proposed in JP-A-56-1997 to lower the dielectric constant of the insulating paper used as the coating 3a of the conductor 3, for example, to lower it to 2.7 or less, to bring it closer to the dielectric constant of oil, and to improve the insulation strength. This is proposed in Japanese Patent No. 134719.

ところで誘導電器巻線の構造を円板巻線を例にとって詳
細にみると第１図のようになっている。By the way, if we look at the structure of an induction electric winding in detail by taking a disk winding as an example, it is as shown in Fig. 1.

すなわち、絶縁筒１の上にレール２を円周上に等間隔に
並べ、この上に紙巻導体３を内側から外側に巻回して形
成した円板状のセクションをスペーサ４を介して軸方向
に積み重ねて一つの巻線を形成している。スペーサは、
撮動などによってもずれないように、レール２にはめ合
わされている。That is, the rails 2 are arranged on the insulating tube 1 at equal intervals on the circumference, and a disk-shaped section formed by winding the paper-wrapped conductor 3 from the inside to the outside is placed on top of the rail 2 in the axial direction via the spacer 4. They are stacked to form one winding. The spacer is
It is fitted onto the rail 2 so that it does not shift even when photographing or the like.

［発明が解決しようとする問題点１ 個々で、レール２やスペーサ４の材料としては、従来は
、プレスボンドが広く使用されている。プレスボンドの
比誘電率は油浸状態で鉱油の約２倍の４．５前後の値を
もつ。従って、前述の誘電率の不整合による巻線間での
微小な油ギャップにおける電界集中は導体間だけにとど
まらず、第２図に示すように、導体３とレール２の接す
る部分Ａや導体３とスペーサ４の接する部分Ｂなどにも
生ずる。このために、導体３の被覆３ａとなる絶縁紙の
誘電率だけを油の誘電率に近付けても、なお巻線内に絶
縁上の弱点が残り、この部分から巻線の絶縁破壊が引き
起こされる欠点を有していた。[Problem 1 to be Solved by the Invention Conventionally, press bond has been widely used as the material for the rails 2 and spacers 4. The dielectric constant of press bond in an oil-immersed state is around 4.5, which is about twice that of mineral oil. Therefore, electric field concentration in the minute oil gap between the windings due to the above-mentioned dielectric constant mismatch is not limited to only between the conductors; This also occurs at the portion B where the spacer 4 and the spacer 4 are in contact. For this reason, even if the dielectric constant of the insulating paper that forms the covering 3a of the conductor 3 is brought close to the dielectric constant of oil, weak points in the insulation still remain within the winding, and dielectric breakdown of the winding occurs from this part. It had drawbacks.

本発明は、巻線内の胴体まわりから絶縁上の弱点を取り
除き、全体として、絶縁強度の高い誘導電器巻線を得る
ことを目的としている。The object of the present invention is to eliminate weak points in insulation from around the body of the winding, and to obtain an induction electric appliance winding having high insulation strength as a whole.

［問題点を解決するための手段］ 本発明による絶縁紙で被覆した導体を円板上に巻回して
形成したコイルセクションを絶縁筒上に並べたレールの
上に嵌合したスペーサを介して複数個積み重ねて構成し
た誘導電器巻線において、この誘導電器巻線は絶縁油中
に浸して使用され、前記導体の被覆とする絶縁紙やレー
ルおよびスペーサに、その誘電率が絶縁油の誘電率の１
．３倍以下の値をもつ材料を用いたことを特徴とするも
のである。[Means for Solving the Problems] A plurality of coil sections formed by winding a conductor covered with insulating paper according to the present invention on a disk are connected via spacers fitted onto rails arranged on an insulating tube. In an induction coil constructed by stacking individual conductors, the induction coil is immersed in insulating oil, and the dielectric constant is equal to the dielectric constant of the insulating oil. 1
．． It is characterized by using a material having a value of 3 times or less.

［作　用１ 本発明による誘導電器巻線においては、導体３の被覆絶
縁紙３ａやレールおよびスペーナ４の材料として、その
誘電率が絶縁油の誘電率の１．３倍以下の値をもつもの
を用いたもので、その材料としては例えばポリテトラフ
ルオロエチレンをはじめとするフッ素樹脂あるいはポリ
メチルペンテン、ポリプロピレン、ポリエチレンなどが
考えられる。[Function 1] In the induction wire according to the present invention, the insulation paper 3a of the conductor 3, the rail, and the spanner 4 are made of materials whose dielectric constant is 1.3 times or less that of the insulating oil. Possible materials include fluororesins such as polytetrafluoroethylene, polymethylpentene, polypropylene, and polyethylene.

これらの材料の比誘電率は、２．０〜２．６の範囲に必
り、油の比誘電率に対して９５〜１２０％の範囲にある
。したがって導体３とレール２の接する部分や、導体３
とスペーサ４の接する部分に生じるくさび状油ギャップ
での電界集中が格段に緩和される。The relative permittivity of these materials is necessarily in the range of 2.0 to 2.6, which is 95 to 120% of the relative permittivity of oil. Therefore, the contact area between the conductor 3 and the rail 2, and the contact area between the conductor 3 and the rail 2
The electric field concentration in the wedge-shaped oil gap that occurs where the spacer 4 and the spacer 4 are in contact with each other is significantly alleviated.

［実施例］ 以下本発明を図面について説明する。第１図において本
発明による誘導電器巻線は、導体３の絶縁紙３ａとして
は低誘電率のプラスチックフィルムとクラフト紙をラミ
ネートした合成紙を使用する。またレール２およびスペ
ーサ４も低誘電率のプラスチック材料を使用することを
特徴とするものである。[Example] The present invention will be described below with reference to the drawings. In FIG. 1, the induction wire according to the present invention uses a synthetic paper obtained by laminating a low dielectric constant plastic film and kraft paper as the insulating paper 3a of the conductor 3. Furthermore, the rail 2 and the spacer 4 are also characterized by using a plastic material with a low dielectric constant.

プラスチック材料としては、例えばポリテトラフルオロ
エチレンをはじめとするフッ素樹脂あるいはポリメチル
ペンテン、ポリプロピレン、ポリエチレンなどが考えら
れる。これらの材料の比誘電率は２．０〜２．６の範囲
にあり、油の比誘電率に対し、９５〜１２０％の範囲に
ある。従って、比誘電率が油の２倍であるＰＢを用いた
場合に比べ、導体３とレール２の接する部分や、導体３
とスペーサ４の接する部分に生じるくさび状油ギャップ
での電界集中が格段に緩和される。Possible plastic materials include, for example, fluororesins such as polytetrafluoroethylene, polymethylpentene, polypropylene, and polyethylene. The relative permittivity of these materials is in the range of 2.0 to 2.6, which is 95 to 120% of the relative permittivity of oil. Therefore, compared to the case of using PB, which has a dielectric constant twice that of oil, the contact area between the conductor 3 and the rail 2, and the
The electric field concentration in the wedge-shaped oil gap that occurs where the spacer 4 and the spacer 4 are in contact with each other is significantly alleviated.

即ら、導体３の絶縁紙３ａヤ、レール２、スペーサ４に
低誘電率材料を用いることによって、巻線内で導体まわ
りの絶縁上の弱点となっていた微小な油ギャップに加わ
る電界を低下させることかでき、巻線全体の絶縁強度を
向−Ｌさぼることができる。That is, by using a low dielectric constant material for the insulating paper layer 3a of the conductor 3, the rail 2, and the spacer 4, the electric field applied to the minute oil gap that was a weak point in the insulation around the conductor in the winding can be reduced. The insulation strength of the entire winding can be reduced by -L.

更にスペーサ４にプラスチック材料を用いた場合、従来
のプレスボードを用いた場合に比へ、製造工程中の吸湿
によるスペーナ厚さの増加かないため、巻線高さの調整
か容易になるという効果も有する。Furthermore, when a plastic material is used for the spacer 4, the thickness of the spacer does not increase due to moisture absorption during the manufacturing process, compared to when a conventional press board is used, making it easier to adjust the winding height. have

なお、上記の説明では、レールやスペーサに用いる低誘
電率材料として、プラスチック材料を例に挙げて説明し
たが、絶縁油との誘電率比が１．２倍以下の材料であれ
ば、プラスチックに限らず有効であることはいうまでも
ない。In the above explanation, plastic material was used as an example of a low dielectric constant material used for rails and spacers, but any material with a dielectric constant ratio of 1.2 times or less to insulating oil can be used as a material. Needless to say, it is effective without limitation.

［発明の効果コ 以上のように本発明によれば、巻線を構成する導体の絶
縁紙やレールおよびスペーサに低誘電率材料を用いるこ
とによって、巻線内で導体まわりの絶縁上の弱点となっ
ていた微小な油ギャップに加わる電界を低下させること
ができ、巻線全体の絶縁強度を向上させることができる
。[Effects of the Invention] As described above, according to the present invention, by using a low dielectric constant material for the insulating paper, rails, and spacers of the conductor constituting the winding, weak points in insulation around the conductor in the winding can be solved. It is possible to reduce the electric field applied to the minute oil gap that was previously caused, and it is possible to improve the insulation strength of the entire winding.

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

第１図は本発明の誘導電器巻線を示す構成図、第２図は
第１図■−■線に沿う断面図、第３図は巻線導体間の絶
縁構成を示す断面図である。 １・・−絶縁筒、　　　　　２・・・レール３・・・巻
線導体、　　　　４・・・スペーナ３ａ・・・被覆 （８７３３）代理人　弁理士　猪　股　祥　晃（ほか　
１名） 第１図 第２図　　　　第ａ図FIG. 1 is a configuration diagram showing an induction electric device winding according to the present invention, FIG. 2 is a sectional view taken along line 1--2 in FIG. 1, and FIG. 3 is a sectional view showing an insulation structure between winding conductors. 1...-Insulation tube, 2...Rail 3...Wound conductor, 4...Spaner 3a...Coating (8733) Agent: Yoshiaki Inomata, patent attorney (and others)
1 person) Figure 1 Figure 2 Figure a

Claims (1)

【特許請求の範囲】[Claims] （１）絶縁紙で被覆した導体を円板上に巻回して形成し
たコイルセクションを絶縁筒上に並べたレールの上に嵌
合したスペーサを介して複数個積み重ねて構成した誘導
電器巻線において、この誘導電器巻線は絶縁油中に浸し
て使用され、前記導体の被覆とする絶縁紙やレールおよ
びスペーサに、その誘電率が絶縁油の誘電率の１．３倍
以下の値をもつ材料を用いたことを特徴とする誘導電器
巻線。(1) In an induction electric winding constructed by stacking a plurality of coil sections formed by winding a conductor coated with insulating paper on a disk via spacers fitted on rails arranged on an insulating tube. , this induction wire is used by immersing it in insulating oil, and the insulating paper, rail, and spacer used to cover the conductor are made of a material whose dielectric constant is 1.3 times or less that of the insulating oil. An induction electric device winding characterized by using.