JP2001143943A - Transformer - Google Patents
TransformerInfo
- Publication number
- JP2001143943A JP2001143943A JP32269399A JP32269399A JP2001143943A JP 2001143943 A JP2001143943 A JP 2001143943A JP 32269399 A JP32269399 A JP 32269399A JP 32269399 A JP32269399 A JP 32269399A JP 2001143943 A JP2001143943 A JP 2001143943A
- Authority
- JP
- Japan
- Prior art keywords
- iron core
- transformer
- core
- heat insulating
- iron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Regulation Of General Use Transformers (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、鉄心による損失の
少ない変圧器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer having a small loss caused by an iron core.
【0002】[0002]
【発明が解決しようとする課題】近年、増大する電力需
要に対して、省エネルギー型の電気機器の要求が高まっ
てきている。変圧器においても、損失の少ない高効率型
のものが望まれている。一般的な電力用三相変圧器は、
三相三脚若しくは三相五脚の鉄心の外周に一次巻線、二
次巻線が巻回されて変圧器中身が構成されている。主
に、密閉式変圧器と乾式変圧器とがあり、密閉式変圧器
はタンク内に変圧器中身が収納され、タンク内に絶縁油
若しくはSF6ガスを注入することにより変圧器中身が
冷却される構成であり、乾式変圧器は変圧器中身の巻線
等をモールド樹脂で被うように成形することにより安全
性を高め外気中に晒した状態で配置される構成である。In recent years, demands for energy-saving electrical equipment have been increasing in response to increasing power demand. There is also a demand for a high-efficiency transformer with low loss. A typical three-phase power transformer is
A primary winding and a secondary winding are wound around the outer periphery of a three-phase three-legged or three-phase five-legged iron core to constitute a transformer. There are mainly closed type transformers and dry type transformers, and the closed type transformers are filled with the contents of the transformer in a tank and cooled by injecting insulating oil or SF6 gas into the tank. The dry-type transformer is configured such that the windings and the like of the transformer are formed so as to be covered with a molding resin to enhance safety and are exposed to the outside air.
【0003】一般的に、巻線には銅条線材が使用され、
鉄心には珪素鋼やパーマロイ等の強磁性体の金属磁芯材
料が使用されている。変換効率は理想的には100%が
望ましいが、実際には、巻線の電気抵抗、漏れ磁束等に
より生じる銅損や、鉄心のヒステリシス損、渦電流損等
により生じる鉄損のため、これらの損失分だけ電力損失
が生じ、変換効率は低下してしまう。従来より、この変
換効率を上げるために、電力損失の一つの要因となって
いる鉄心を、板状鋼板を積層させた積層鉄心、若しくは
シート状鋼板を巻き重ねた巻鉄心等の構成として、渦電
流損を減らす方法が用いられてきた。この方法は、低コ
ストで鉄損を低減できるので、一般的に使用されてい
る。しかし、更に損失の少ない高効率型(省エネルギー
型)の変圧器の需要の要求は高く、鉄損の損失を減らす
ための種々の改良が行われている。[0003] Generally, a copper wire is used for the winding,
A ferromagnetic metal core material such as silicon steel or permalloy is used for the iron core. Ideally, the conversion efficiency is 100%. However, in actuality, these are copper loss caused by electric resistance of the windings, leakage magnetic flux, etc., and iron loss caused by hysteresis loss, eddy current loss, etc. of the iron core. The power loss occurs due to the loss, and the conversion efficiency decreases. Conventionally, in order to increase the conversion efficiency, the core, which is one of the factors of power loss, is configured as a vortex by using a laminated core formed by laminating plate-shaped steel plates or a wound core formed by winding sheet-shaped steel plates. Methods have been used to reduce current loss. This method is generally used because iron loss can be reduced at low cost. However, there is a high demand for a high-efficiency (energy-saving) transformer with even less loss, and various improvements have been made to reduce iron loss loss.
【0004】例えば、鉄心の断面積を大きくすることに
より鉄損を減らす方法がある。ある一定電力が一次巻線
に供給された場合、鉄心の断面積が大きいほど磁束密度
が小さくなるので、鉄損を減少させることができる。し
かし、この方法では鉄心を大きくする必要があり、変圧
器が大型化及び重量化し、コストが上がる等の問題が生
じる。また、別の方法として、鉄心に高配向性のハイグ
レード材料を使用することにより鉄損を減らす方法があ
る。これは、強磁性体の金属磁芯材料の結晶方向の高度
な配向や磁区の細分化を人為的に行うことにより、鉄心
内の電気抵抗を高め鉄損を減らしたものである。この方
法では鉄損を低減できるが、材料により鉄損が固有値で
あるので、低減に限度がある。[0004] For example, there is a method of reducing iron loss by increasing the cross-sectional area of an iron core. When a certain amount of electric power is supplied to the primary winding, the larger the cross-sectional area of the iron core, the smaller the magnetic flux density, so that the iron loss can be reduced. However, in this method, it is necessary to increase the size of the iron core, which causes problems such as an increase in size and weight of the transformer and an increase in cost. As another method, there is a method of reducing iron loss by using a high-grade material having a high orientation for the iron core. This is to increase the electrical resistance in the iron core and reduce the iron loss by artificially performing a high degree of crystal orientation of the ferromagnetic metal core material and subdividing the magnetic domains. Although the iron loss can be reduced by this method, the reduction is limited because the iron loss is an intrinsic value depending on the material.
【0005】本発明は上述の事情に鑑みてなされたもの
であり、従ってその目的は、比較的安価で変換効率の高
い変圧器を提供することにある。[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide a transformer which is relatively inexpensive and has high conversion efficiency.
【0006】[0006]
【課題を解決するための手段】請求項1記載の変圧器
は、鉄心と、この鉄心に装着された巻線と、前記鉄心の
放熱を抑制する断熱手段とを具備した変圧器中身を設け
たことを特徴とする。◎このような構成によれば、巻線
に電力が供給されると、鉄心は、鉄心内部で発生した熱
が断熱材で放熱を抑制され、高温に保持される。これに
より、鉄心内部の電気抵抗が大きくなり渦電流損が減少
する。従って、鉄損が減るので、変圧器の変換効率を上
げることができ、しかも、断熱手段を設けるだけである
ので、比較的安価になし得る。According to a first aspect of the present invention, there is provided a transformer including a core having a core, windings attached to the core, and heat insulating means for suppressing heat radiation of the core. It is characterized by the following. According to such a configuration, when power is supplied to the winding, the heat generated in the core is suppressed by the heat insulating material, and the core is maintained at a high temperature. As a result, the electric resistance inside the iron core increases, and the eddy current loss decreases. Therefore, since the iron loss is reduced, the conversion efficiency of the transformer can be increased, and the cost can be relatively low because only the heat insulating means is provided.
【0007】請求項2記載の変圧器は、断熱手段が鉄心
の全面を覆う断熱材で構成されていることを特徴とす
る。このような構成によれば、鉄心は鉄心内部で発生し
た熱がほとんど放熱されないので、一次巻線への電力の
供給を開始してから短時間で鉄心を高温にさせることが
でき、一層変換効率をよくすることができる。A transformer according to a second aspect is characterized in that the heat insulating means is made of a heat insulating material covering the entire surface of the iron core. According to such a configuration, since the heat generated in the core is hardly dissipated, the core can be heated to a high temperature in a short time after the power supply to the primary winding is started, and the conversion efficiency is further improved. Can be better.
【0008】請求項3記載の変圧器は、断熱手段が、少
なくとも鉄心と巻線との間に介在された断熱材を有して
構成されていることを特徴とする。このような構成によ
っても、請求項1と同様の効果が得られる。According to a third aspect of the present invention, the transformer is characterized in that the heat insulating means has at least a heat insulating material interposed between the iron core and the winding. With such a configuration, the same effect as that of the first aspect can be obtained.
【0009】請求項4記載の変圧器は、鉄心を支持する
支持物の少なくとも一部が、断熱効果を有する機械的強
度の大なる絶縁材で構成されていることを特徴とする。
このような構成によれば、鉄心と支持物との間に断熱材
を介在させずに断熱することもできる。A transformer according to a fourth aspect of the present invention is characterized in that at least a part of the support for supporting the iron core is made of an insulating material having a heat insulating effect and high mechanical strength.
According to such a configuration, it is also possible to perform heat insulation without interposing a heat insulating material between the iron core and the support.
【0010】請求項5記載の変圧器は、巻線の少なくと
も鉄心に対応する面が、断熱効果を有する機械的強度の
大なる絶縁材で構成されていることを特徴とする。この
ような構成によれば、巻線に断熱手段を具備させること
で、鉄心と巻線との間の断熱材を省くこともできる。According to a fifth aspect of the present invention, at least a surface of the winding corresponding to the iron core is made of an insulating material having a heat insulating effect and high mechanical strength. According to such a configuration, by providing the winding with the heat insulating means, the heat insulating material between the iron core and the winding can be omitted.
【0011】請求項6記載の変圧器は、断熱手段が鉄心
を収納する密閉容器で構成され、前記密閉容器内が真空
にされていることを特徴とする。このような構成によれ
ば、真空断熱により断熱効果を上げることができ、更に
高温鉄心と空気との反応による鉄心の酸化を防ぐことが
できる。According to a sixth aspect of the present invention, in the transformer, the heat insulating means is constituted by a closed container for storing the iron core, and the inside of the closed container is evacuated. According to such a configuration, the heat insulation effect can be enhanced by the vacuum heat insulation, and the oxidation of the iron core due to the reaction between the high-temperature iron core and the air can be prevented.
【0012】請求項7記載の変圧器は、断熱手段が鉄心
を収納する密閉容器で構成され、前記密閉容器内には耐
熱分解性に優れたガスが封入されていることを特徴とす
る。このような構成によっても、請求項6と同様の効果
が得られる。A transformer according to a seventh aspect of the present invention is characterized in that the heat insulating means is constituted by a closed container for accommodating an iron core, and the closed container is filled with a gas having excellent thermal decomposition resistance. With such a configuration, the same effect as that of the sixth aspect can be obtained.
【0013】請求項8記載の変圧器は、請求項1乃至請
求項5のいずれかに記載の変圧器中身がタンク内に収納
され、前記タンク内には耐熱分解性に優れたガスが封入
されていることを特徴とする。このような構成によれ
ば、高温鉄心と空気との反応による鉄心の酸化を回避す
ることができる。また、タンク内に絶縁油を注入させた
場合に高温鉄心に晒されることによる絶縁油の熱劣化の
発生や、タンク内にSF6ガスを封入させた場合に珪素
鋼板製鉄心内の珪素とSF6ガスとの反応による有害ガ
スの発生を回避することができる。According to an eighth aspect of the present invention, the transformer according to any one of the first to fifth aspects is accommodated in a tank, and a gas excellent in heat decomposition resistance is sealed in the tank. It is characterized by having. According to such a configuration, oxidation of the iron core due to the reaction between the high-temperature iron core and the air can be avoided. In addition, when the insulating oil is injected into the tank, the insulating oil is exposed to the high-temperature iron core, causing thermal deterioration of the insulating oil. When the tank is filled with SF6 gas, the silicon and SF6 gas in the silicon steel plate iron core are deteriorated. And the generation of harmful gas due to the reaction with
【0014】[0014]
【発明の実施の形態】以下、本発明の第1の実施例につ
いて、図1乃至図3を参照して説明する。まず、図2
は、三相の変圧器中身1の構成を示している。また、図
1(a),(b)は、図2におけるA−A線、B−B線
での断面図を示している。鉄心2は、図1(a),
(b)に示すように、所定の形状、厚さに切断された珪
素鋼板が積層されたものを、鉄心脚部3と鉄心ヨーク部
4a,4bとに交互に積み重ねたバッドジョイント方式
により構成された積層三相三脚鉄心である。珪素鋼板
は、圧延機により帯状に圧延されて圧延方向の鉄損を低
減させた方向性珪素鋼板であり、両面に絶縁被膜が施さ
れている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, FIG.
Shows the configuration of the three-phase transformer contents 1. FIGS. 1A and 1B are cross-sectional views taken along lines AA and BB in FIG. The iron core 2 is shown in FIG.
As shown in (b), a silicon steel plate cut into a predetermined shape and thickness is laminated, and is formed by a bad joint system in which the iron core legs 3 and the iron core yokes 4a and 4b are alternately stacked. It is a laminated three-phase tripod core. The silicon steel sheet is a directional silicon steel sheet which is rolled into a belt shape by a rolling mill to reduce iron loss in a rolling direction, and has an insulating coating on both surfaces.
【0015】鉄心2には、その表面積に合わせて各面毎
に板状に切断された断熱手段たるセラミックス製の断熱
板5が、鉄心2の表面全体にシリコーン樹脂製の接着剤
6で接着されて装着されている。この断熱板5はH種絶
縁材であり、最高耐熱温度が180℃のものである。巻
線7は、銅条巻線であり、3本の鉄心脚部3の外周に、
それぞれ一次巻線7aが角筒状に巻回されており、さら
に一次巻線7aの外周に二次巻線7bが角筒状に巻回さ
れて構成されている。A ceramic heat insulating plate 5 serving as a heat insulating means, which is cut into a plate for each surface according to its surface area, is adhered to the entire surface of the iron core 2 with an adhesive 6 made of silicone resin. Is attached. The heat insulating plate 5 is a class H insulating material and has a maximum heat resistance temperature of 180 ° C. The winding 7 is a copper strip winding, and is provided on the outer circumference of the three iron core legs 3.
Each of the primary windings 7a is wound in a rectangular cylindrical shape, and the secondary winding 7b is wound around the outer periphery of the primary winding 7a in a rectangular cylindrical shape.
【0016】次に、図2に示すように、鉄心2を固定す
るための非磁性鋼製の台座8上面には、支持物たる下部
クランプ9,9を固定するための複数本のボルト10が
垂直に突出して固着されている。下部鉄心ヨーク部4a
の下部クランプ9,9は非磁性鋼製であり、下部鉄心ヨ
ーク部4aの圧延方向の長さと同長のT字形(或いはL
字形)をなし、その水平面部が台座8上面と接するよう
にして平行に配置され、垂直面部の間に断熱板5に囲ま
れた鉄心2を挟み込んで固定するようになっている。下
部クランプ9,9の水平面部には通し穴が設けられてお
り、台座8上面に垂直に固着されたボルト10がこの通
し穴に通されてナット11で固定されている。Next, as shown in FIG. 2, a plurality of bolts 10 for fixing lower clamps 9, 9 serving as supports are provided on the upper surface of a nonmagnetic steel pedestal 8 for fixing the iron core 2. It is vertically projected and fixed. Lower core yoke 4a
The lower clamps 9, 9 are made of non-magnetic steel and have a T-shaped (or L-shaped) having the same length as the length of the lower core yoke 4a in the rolling direction.
And a horizontal surface portion thereof is arranged in parallel with the upper surface of the base 8 so as to be in contact therewith, and the iron core 2 surrounded by the heat insulating plate 5 is sandwiched and fixed between the vertical surface portions. A through hole is provided in a horizontal plane portion of the lower clamps 9, 9, and a bolt 10 vertically fixed to the upper surface of the pedestal 8 is passed through the through hole and fixed with a nut 11.
【0017】上部鉄心ヨーク部4bの上部クランプ1
2,12は非磁性鋼製であり、上部鉄心ヨーク部4bの
圧延方向の長さと同長の板状をなし、断熱板5で囲まれ
た鉄心2を挟み込んで固定するようになっている。尚、
変圧器中身1は、タンク(図示せず)内に収納され、そ
のタンク内に絶縁油、或いはSF6ガスが充填されるこ
とにより、密閉式変圧器として構成され、また、変圧器
中身1の巻線7が樹脂モールドされることにより、乾式
変圧器として構成される。密閉式変圧器では、台座8の
代わりにタンクの底板を兼用してもよい。Upper clamp 1 of upper core yoke 4b
Reference numerals 2 and 12 are made of non-magnetic steel, and have a plate shape having the same length as the length of the upper core yoke portion 4b in the rolling direction. The iron core 2 surrounded by the heat insulating plate 5 is sandwiched and fixed. still,
The transformer contents 1 are housed in a tank (not shown), and the tank is filled with insulating oil or SF6 gas to form a sealed transformer. The wire 7 is formed as a dry transformer by being resin-molded. In the closed type transformer, the base plate of the tank may be used in place of the pedestal 8.
【0018】次に、本実施例の作用について、図3をも
参照して説明する。今、巻線7の一次巻線7aに、電源
から交流電圧が印加されると、一次巻線7aには交流電
流が流れ、鉄心2内に磁束が発生する。このとき、二次
巻線7bには、電磁誘導作用により誘起電圧が発生す
る。この誘起電圧の大きさは、一次巻線7aと二次巻線
7bとの巻回数比に比例するので、電源電圧が変圧され
て出力される。Next, the operation of this embodiment will be described with reference to FIG. Now, when an AC voltage is applied from the power supply to the primary winding 7a of the winding 7, an alternating current flows through the primary winding 7a, and a magnetic flux is generated in the iron core 2. At this time, an induced voltage is generated in the secondary winding 7b by an electromagnetic induction action. Since the magnitude of the induced voltage is proportional to the turn ratio between the primary winding 7a and the secondary winding 7b, the power supply voltage is transformed and output.
【0019】このとき、鉄心2にはヒステリシス損や渦
電流損などの鉄損により熱が発生する。積層鉄心は圧延
鋼板の積層方向に比べ圧延された鋼板面方向への熱伝導
性が良いため、発生した熱はこの鋼板面方向に熱伝導さ
れ易く、そのため鉄心2の表面は圧延鋼板の積層方向側
の両表面(図2における鉄心2の前,後面)に比べその
両表面と直交する表面(図2における鉄心2の上下面,
左右側面)が高温になる。鉄心2は全面が断熱板5に覆
われているために熱の放熱は抑制され、鉄心2の温度が
上昇する。鉄の電気抵抗率は温度の上昇とともに大きく
なるので、鉄心2の温度が上昇すると電気抵抗が大きく
なる。At this time, heat is generated in the iron core 2 due to iron loss such as hysteresis loss and eddy current loss. Since the laminated core has better thermal conductivity in the direction of the rolled steel sheet than in the direction of lamination of the rolled steel sheet, the generated heat is easily conducted in the direction of the steel sheet. 2 surfaces (front and rear surfaces of the iron core 2 in FIG. 2) and surfaces orthogonal to the two surfaces (upper and lower surfaces of the iron core 2 in FIG. 2,
The left and right sides become hot. Since the entire surface of the core 2 is covered with the heat insulating plate 5, heat radiation is suppressed, and the temperature of the core 2 rises. Since the electrical resistivity of iron increases with an increase in temperature, an increase in the temperature of the iron core 2 increases the electrical resistance.
【0020】一方、鉄心2の電気抵抗が大きくなるほど
鉄心2に発生する渦電流損は減少するので、鉄心2の温
度が上昇すると、鉄損が減少することとなる。この関係
を、鉄心2の温度に対する鉄損(重量当たりの鉄心の電
力損失)と磁束密度の関係として図3に示す。図3は珪
素鋼板の場合の特性を示しており、例えば、磁束密度
1.7Tに対して、鉄損は、室温のとき1.1W/k
g、100℃のとき1.0W/kg、200℃のとき
0.92W/kg、300℃のとき0.86W/kgと
なり、室温と比較して100℃で約9%、200℃で約
16%、300℃で約22%の鉄損が低減できることと
なる。このように、鉄心2が高温になるほど鉄損は低減
でき、変圧器の変換効率を上げることができる。この鉄
心2の温度は150℃を超えた付近から鉄損の減少作用
による変圧器の変換効率の上昇効果が徐々に現れるの
で、鉄心2は150℃超にすることが実用上、効果的で
ある。On the other hand, since the eddy current loss generated in the iron core 2 decreases as the electric resistance of the iron core 2 increases, the iron loss decreases as the temperature of the iron core 2 increases. This relationship is shown in FIG. 3 as the relationship between the iron loss (power loss of the iron core per weight) with respect to the temperature of the iron core 2 and the magnetic flux density. FIG. 3 shows characteristics in the case of a silicon steel sheet. For example, when the magnetic flux density is 1.7 T, the iron loss is 1.1 W / k at room temperature.
g, 1.0 W / kg at 100 ° C., 0.92 W / kg at 200 ° C., 0.86 W / kg at 300 ° C., about 9% at 100 ° C. and about 16 %, And about 22% of iron loss at 300 ° C. can be reduced. As described above, as the temperature of the iron core 2 increases, the iron loss can be reduced, and the conversion efficiency of the transformer can be increased. When the temperature of the iron core 2 exceeds about 150 ° C., the effect of reducing the iron loss gradually increases the conversion efficiency of the transformer, so that it is practically effective to make the iron core 2 exceed 150 ° C. .
【0021】また、鉄心2は発生する熱により高温にな
るにしたがって鉄損が減少するので、発生する熱量も減
少する。この性質により、ある一定電力が一次巻線7a
に供給されると鉄心2は発熱して高温になるが、鉄損の
減少という発熱量のネガティブフィードバックがかか
り、ある一定の高温状態に保持されることとなる。従っ
て、一次巻線7aへの供給電圧を調節することにより鉄
心2の温度制御が可能となる。また、鉄心2がキューリ
ー温度まで上昇して透磁率が低下することを防ぐことも
できる。Further, since the iron loss of the iron core 2 decreases as the temperature increases due to the generated heat, the amount of generated heat also decreases. Due to this property, a certain constant power is supplied to the primary winding 7a.
When the iron core 2 is supplied, the core 2 generates heat and becomes high in temperature. However, negative feedback of the calorific value is applied to reduce the iron loss, and the core 2 is maintained at a certain high temperature state. Therefore, the temperature of the iron core 2 can be controlled by adjusting the supply voltage to the primary winding 7a. Also, it is possible to prevent the iron core 2 from rising to the Curie temperature and decreasing the magnetic permeability.
【0022】断熱材は、鉄心2の温度が高温になるた
め、例えば、150℃超の許容温度を有する断熱材を使
用するのがよい。好ましくは最高許容温度が180℃の
H種絶縁材を使用することにより、鉄心2を180℃ま
で上げることができる。また、C種絶縁材を使用するこ
とにより、鉄心2を更に高温に上げることができる。従
って、断熱材として、本実施例のセラミックス製の断熱
板5のようなH種絶縁材を使用する場合は鉄心2の温度
が150℃超180℃以下に保持されるように温度制御
し、C種絶縁材を使用する場合は鉄心2の温度がその絶
縁材の好ましくは180℃以上最高許容温度以下になる
ように温度制御する。Since the temperature of the iron core 2 becomes high, it is preferable to use a heat insulating material having an allowable temperature exceeding 150 ° C., for example. Preferably, the core 2 can be raised to 180 ° C. by using a class H insulating material having a maximum allowable temperature of 180 ° C. Further, the use of the C-type insulating material allows the temperature of the iron core 2 to be further increased. Therefore, when an H-class insulating material such as the ceramic insulating plate 5 of the present embodiment is used as the heat insulating material, the temperature of the iron core 2 is controlled so as to be maintained at more than 150 ° C. and at most 180 ° C. When a seed insulating material is used, the temperature of the core 2 is controlled so that the temperature of the insulating material is preferably 180 ° C. or more and the maximum allowable temperature or less.
【0023】このように本実施例によれば、鉄心2全面
にH種絶縁材の断熱板5を装着させた構成として、電源
から一次巻線7aに一定電力量を供給することにより、
鉄心2の温度が150℃超180℃以下に保持されるよ
うにした。これにより、鉄心2の温度が高温に保持され
て鉄損が減少するので、変圧器の変換効率を上げること
ができる。従って、鉄心2の断面積を大きくしたり、鉄
心2の材料として高価なハイグレード材料を使用したり
することなく、変圧器の変換効率を上げることができ
る。As described above, according to the present embodiment, the heat insulating plate 5 made of an H-class insulating material is mounted on the entire surface of the iron core 2 so that a constant amount of power is supplied from the power supply to the primary winding 7a.
The temperature of the iron core 2 was maintained at more than 150 ° C. and 180 ° C. or less. Thereby, the temperature of the iron core 2 is maintained at a high temperature and iron loss is reduced, so that the conversion efficiency of the transformer can be increased. Therefore, the conversion efficiency of the transformer can be increased without increasing the sectional area of the iron core 2 or using an expensive high-grade material as the material of the iron core 2.
【0024】次に、本発明の第2の実施例について、図
4(a),(b)を参照して説明する。図4(a),
(b)は、第1の実施例の変圧器中身1に代わる変圧器
中身13を示している。尚、図1と同一部分には同一符
号を付して説明を省略し、以下異なる部分についてのみ
説明する。Next, a second embodiment of the present invention will be described with reference to FIGS. 4 (a) and 4 (b). FIG. 4 (a),
(B) has shown the transformer content 13 which replaces the transformer content 1 of 1st Example. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described below.
【0025】巻線7は、銅条巻線であり、円筒状の巻芯
14に一次巻線7aが巻回されており、さらに一次巻線
7aの外周に二次巻線7bが巻回されて構成されてい
る。この巻芯14は、断熱手段たるセラミックス製の断
熱材(H種絶縁材)で形成されている。巻線7は、3本
の鉄心脚部3の外周に支持部材(図示せず)で固定され
て装着されており、また、巻芯14と鉄心2との間には
クッション性を有するゴム状のシリコーン樹脂製の接着
剤15が注入されている。即ち、この第2の実施例は、
第1の実施例における鉄心脚部3に装着された断熱板5
が省略され、その代わりを巻芯14が行うように構成さ
れたものである。The winding 7 is a copper strip winding. A primary winding 7a is wound around a cylindrical winding core 14, and a secondary winding 7b is wound around the outer periphery of the primary winding 7a. It is configured. The core 14 is formed of a ceramic heat-insulating material (H-class insulating material) which is a heat-insulating means. The winding 7 is fixedly mounted on the outer periphery of the three iron core legs 3 with a support member (not shown), and a rubber-like material having cushioning properties is provided between the core 14 and the iron core 2. The adhesive 15 made of silicone resin is injected. That is, in the second embodiment,
Thermal insulation plate 5 mounted on iron core leg 3 in the first embodiment
Are omitted, and the winding core 14 performs instead.
【0026】この第2の実施例によれば、第1の実施例
同様の効果が得られ、特に、巻芯形の巻線7が本来有す
る巻芯14に断熱作用を行わせるので、それだけ材料の
使用量を少なくすることができ、また、シリコーン樹脂
製の接着剤15も断熱性を有することから、断熱効果が
よくなる。更に、この接着剤15により、鉄心2が外気
と接する面積が減るので鉄心2の酸化を防ぐことができ
る。また、鉄心2の熱膨張がゴム状の接着剤15で吸収
されて打ち消される。According to the second embodiment, the same effects as those of the first embodiment can be obtained. In particular, since the core 14 inherent in the core-shaped winding 7 is provided with a heat insulating function, the material is accordingly reduced. Can be reduced, and since the adhesive 15 made of silicone resin also has heat insulating properties, the heat insulating effect is improved. Further, the adhesive 15 reduces the area where the iron core 2 comes into contact with the outside air, so that oxidation of the iron core 2 can be prevented. Further, the thermal expansion of the iron core 2 is absorbed by the rubber-like adhesive 15 and is canceled.
【0027】次に、本発明の第3の実施例について、図
5(a),(b)を参照して説明する。図5(a),
(b)は、第2の実施例の変圧器中身13の代わりの変
圧器中身16示している。尚、図4と同一部分には同一
符号を付して説明を省略し、以下異なる部分についての
み説明する。鉄心2を支持する支持物の一部たる下部ク
ランプ17及び上部クランプ18は、形状は第2の実施
例記載の下部クランプ9及び上部クランプ12と同様の
構成であるが、材質は断熱手段たるセラミック製の断熱
材(H種絶縁材)で形成されている。そして、鉄心ヨー
ク部4a,4bの前,後面の断熱板5及び下部鉄心ヨー
ク部4aの下面の断熱板5は省略され、これらの代わり
を下部クランプ部17及び上部クランプ部18がなして
いる。Next, a third embodiment of the present invention will be described with reference to FIGS. 5 (a) and 5 (b). FIG. 5 (a),
(B) shows a transformer content 16 instead of the transformer content 13 of the second embodiment. Note that the same parts as those in FIG. 4 are denoted by the same reference numerals and description thereof is omitted, and only different parts will be described below. The lower clamp 17 and the upper clamp 18 which are a part of the support for supporting the iron core 2 have the same configuration as the lower clamp 9 and the upper clamp 12 described in the second embodiment, but are made of ceramic which is a heat insulating means. It is formed of a heat insulating material (H-class insulating material) made of stainless steel. The heat insulating plates 5 on the front and rear surfaces of the core yoke portions 4a and 4b and the heat insulating plate 5 on the lower surface of the lower core yoke portion 4a are omitted, and a lower clamp portion 17 and an upper clamp portion 18 are used instead of these.
【0028】このように第3の実施例によれば、第2の
実施例と同様の効果が得られ、特に、鉄心2と巻線7及
びクランプ17,18との間に断熱材を介在させなくて
よいので、変圧器中身16の製造工程が簡単になり、一
層材料が少なくて済む。As described above, according to the third embodiment, the same effects as those of the second embodiment can be obtained. In particular, a heat insulating material is interposed between the iron core 2 and the windings 7 and the clamps 17 and 18. Since there is no need, the manufacturing process of the transformer contents 16 is simplified, and further less material is required.
【0029】次に、本発明の第4の実施例について、図
6を参照して説明する。図6は、第1の実施例の変圧器
中身1を用いた密閉式変圧器19を示している。尚、図
1と同一部分には同一符号を付して説明を省略し、以下
異なる部分についてのみ説明する。変圧器中身1はタン
ク20内に収納され、タンク20内は耐熱分解性に優れ
たガスたる窒素ガス21が封入されている。タンク20
上面にはブッシング22及び23が装着されており、巻
線7の一次側端子(図示せず)及び二次側端子(図示せ
ず)がそれぞれブッシング22及び23に接続されてい
る。Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 6 shows a sealed transformer 19 using the transformer contents 1 of the first embodiment. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described below. The contents 1 of the transformer are housed in a tank 20, and the tank 20 is filled with a nitrogen gas 21 which is a gas having excellent thermal decomposition resistance. Tank 20
Bushings 22 and 23 are mounted on the upper surface, and a primary terminal (not shown) and a secondary terminal (not shown) of the winding 7 are connected to the bushings 22 and 23, respectively.
【0030】このように第4の実施例によれば、タンク
20内に窒素ガス21を封入することにより、変圧器中
身1の酸化を防ぐことができる。しかも、窒素ガス21
は安価である。また、タンク20内に絶縁油が注入され
た場合に高温鉄心に晒された絶縁油が熱分解してタール
状になり、絶縁力が低下することを回避することができ
る。若しくは、タンク20内にSF6ガスが封入された
場合に高温になった珪素鋼板製の鉄心2表面の珪素がS
F6ガスと反応して、有害ガスが発生することを回避す
ることができる。また、このタンク20内には、変圧器
中身13,16を収納しても、同様の効果が得られる。As described above, according to the fourth embodiment, by oxidizing the contents 1 of the transformer, the nitrogen gas 21 is sealed in the tank 20. Moreover, the nitrogen gas 21
Is cheap. In addition, when the insulating oil is injected into the tank 20, the insulating oil exposed to the high-temperature iron core is thermally decomposed into a tar-like state, thereby preventing a decrease in insulating power. Alternatively, the silicon on the surface of the iron core 2 made of a silicon steel plate that has become hot when SF6 gas is sealed in the tank 20 is S
It is possible to avoid generation of a harmful gas by reacting with the F6 gas. The same effect can be obtained even if the transformer contents 13, 16 are stored in the tank 20.
【0031】次に、本発明の第5の実施例について、図
7(a),(b)及び図8を参照して説明する。図7
(a),(b)は、第1の実施例の変圧器中身1の代わ
りの変圧器中身24を示しており、図8は、この第5の
実施例で用いる密閉容器25を示している。尚、図1と
同一部分には同一符号を付して説明を省略し、以下異な
る部分についてのみ説明する。密閉容器25は、図8に
示すように、非磁性鋼で形成されており、鉄心脚部3を
収納する脚部収納部26と、上部鉄心ヨーク部4bを収
納する上部ヨーク部収納部27と、下部鉄心ヨーク部4
aを収納する下部ヨーク部収納部28とから構成されて
いる。脚部収納部26は、鉄心脚部3を内部に通すため
の開口部26aを両端に有する角状の3つの筒体26b
が鉄心脚部3の間隔に合わせて一列に配置され、それら
の筒体26bの下端部間に、2つの平板26cがそれぞ
れ溶接されて構成されている。上部ヨーク部収納部2
7、下部ヨーク部収納部28は、一面が開口された容器
型形状をなしている。また、上部ヨーク部収納部27の
上面に該当する面には密閉容器25内部を真空にしたり
気体を封入したりするための円筒状の通気口29が設け
られている。尚、脚部収納部26の3つの筒体26bの
上端部間には、平板26cと対向するように、後述する
ようにして閉塞板26dが溶接されるようになってい
る。Next, a fifth embodiment of the present invention will be described with reference to FIGS. 7 (a), 7 (b) and 8. FIG.
(A) and (b) show a transformer content 24 instead of the transformer content 1 of the first embodiment, and FIG. 8 shows a sealed container 25 used in the fifth embodiment. . The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described below. As shown in FIG. 8, the closed container 25 is formed of non-magnetic steel, and includes a leg storage portion 26 for storing the core leg portion 3 and an upper yoke portion storage portion 27 for storing the upper core yoke portion 4b. , Lower core yoke 4
and a lower yoke storing section 28 for storing the “a”. The leg storage portion 26 has three horn-shaped cylindrical bodies 26b having openings 26a at both ends for passing the iron core leg 3 therein.
Are arranged in a line in accordance with the interval between the iron core legs 3, and two flat plates 26c are welded between the lower ends of the cylindrical bodies 26b. Upper yoke storage 2
7. The lower yoke storage section 28 has a container-like shape with one surface opened. A cylindrical vent 29 is provided on a surface corresponding to the upper surface of the upper yoke housing portion 27 for evacuating the inside of the sealed container 25 or sealing gas. A closing plate 26d is welded between the upper ends of the three cylindrical bodies 26b of the leg housing 26 so as to be opposed to the flat plate 26c as described later.
【0032】しかして、下部鉄心ヨーク部4aは下部ヨ
ーク部収納部28に収納され、3本の鉄心脚部3は脚部
収納部26に収納され、上部鉄心ヨーク部4bは上部ヨ
ーク部収納部27に収納され、それぞれの収納部26,
27,28間の接合面が溶接され、最後に閉塞板26d
が筒部26b上端部間に平板26cと対向するように溶
接されて、密閉容器25が形成されている。そして、各
収納部26,27,28と鉄心2との両角部間には、図
7(a),(b)に示すように、間隔保持部材30が挿
入されており、シリコーン樹脂製の接着剤31で接着さ
れて装着されている。この密閉容器25内は真空にされ
ており、断熱手段たる真空断熱が施されている。Thus, the lower core yoke portion 4a is stored in the lower yoke portion storage portion 28, the three core leg portions 3 are stored in the leg portion storage portion 26, and the upper core yoke portion 4b is stored in the upper yoke portion storage portion. 27, and the respective storage units 26,
The joining surface between 27 and 28 is welded, and finally the closing plate 26d
Are welded between the upper ends of the cylindrical portions 26b so as to face the flat plate 26c, thereby forming the closed container 25. As shown in FIGS. 7A and 7B, a spacing member 30 is inserted between the two corners of each of the storage portions 26, 27, and 28 and the iron core 2. It is attached with an adhesive 31. The inside of the closed container 25 is evacuated, and a vacuum insulation function as a heat insulation means is provided.
【0033】このように第5の実施例によれば、密閉容
器25内に鉄心2を収納し、密閉容器25内部を真空断
熱とすることで断熱性が高まり、鉄心2の放熱抑制力が
高まった分だけ、変圧器の変換効率が上がる。また、こ
の第5の実施例において、密閉容器25内は耐熱分解性
に優れたガスたる窒素ガスを封入することによって断熱
手段たるガス断熱が施された構成としてもよい。この場
合にも断熱性が高くなるので変圧器の変換効率を上げる
ことができる。しかも、このように密閉容器25内を真
空にしたり窒素ガスを封入することにより、鉄心2の酸
化を防ぐことができ、また、磁歪振動や磁気振動に起因
する鉄心2の振動を密閉容器25内部で吸収させること
もできる。As described above, according to the fifth embodiment, the core 2 is housed in the sealed container 25, and the inside of the sealed container 25 is vacuum-insulated, so that the heat insulating property is enhanced, and the heat radiation suppressing power of the iron core 2 is increased. As a result, the conversion efficiency of the transformer increases. Further, in the fifth embodiment, the inside of the closed vessel 25 may be configured to have a gas insulation function as a heat insulation means by enclosing a nitrogen gas which is a gas having excellent thermal decomposition resistance. Also in this case, since the heat insulating property is increased, the conversion efficiency of the transformer can be increased. In addition, by evacuating the sealed container 25 or filling nitrogen gas therein, oxidation of the iron core 2 can be prevented, and vibration of the iron core 2 caused by magnetostrictive vibration or magnetic vibration can be reduced. Can also be absorbed.
【0034】次に、本発明の第6の実施例について、図
9(a),(b)を参照して説明する。図9(a),
(b)は第5の実施例の変圧器中身24に代わる変圧器
中身32を示している。尚、図7と同一部分には同一符
号を付して説明を省略し、以下異なる部分についてのみ
説明する。この第6の実施例においては、密閉容器25
の代わりに、鉄心2の全面を、その全面との間に多数の
間隔保持部材33を介して高分子フィルムで覆うことに
より密閉容器34を構成したものであり、その内部は真
空にされ、断熱手段たる真空断熱が施されている。Next, a sixth embodiment of the present invention will be described with reference to FIGS. 9 (a) and 9 (b). FIG. 9 (a),
(B) shows a transformer content 32 which replaces the transformer content 24 of the fifth embodiment. The same parts as those in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described below. In the sixth embodiment, the closed container 25
Instead of this, a closed container 34 is formed by covering the entire surface of the core 2 with a polymer film via a number of spacing members 33 between the entire surface and the entire surface thereof. Vacuum insulation as a means is provided.
【0035】このような第6の実施例によっても、第5
の実施例と同様の効果が得られ、特に、密閉容器33は
高分子フィルム製であるので、軽量化を図ることができ
る。しかも、高分子フィルム製の密閉容器33として
も、鉄心2との間に多数の間隔保持部材32を介在させ
ているので、内部を真空としても密閉容器33に変形を
もたらすことはない。また、密閉容器の材質は、密閉性
及び耐熱性に優れた有機絶縁材料が適しており、高分子
フィルム以外にも、グラスファイバーなどを用いてもよ
い。According to the sixth embodiment, the fifth embodiment
The same effect as that of the embodiment can be obtained. In particular, since the sealed container 33 is made of a polymer film, the weight can be reduced. In addition, since a large number of the spacing members 32 are interposed between the core 2 and the sealed container 33 made of a polymer film, the sealed container 33 is not deformed even if the inside is vacuumed. Further, as the material of the sealed container, an organic insulating material having excellent sealing property and heat resistance is suitable, and glass fiber or the like may be used instead of the polymer film.
【0036】尚、本発明は、上記し、且つ図面に示す実
施例にのみ限定されるものではなく、次のような変形、
拡張が可能である。本発明の第1の実施例において、断
熱手段は断熱板5によって構成したが、テープ状の断熱
材を鉄心2に巻き付けた構成としてもよい。テープ状の
絶縁材として、例えば、高分子フィルムなどの可とう性
の有機絶縁材料が挙げられる。The present invention is not limited to the embodiment described above and shown in the drawings.
Extension is possible. In the first embodiment of the present invention, the heat insulating means is constituted by the heat insulating plate 5, but may be constituted by winding a tape-shaped heat insulating material around the iron core 2. Examples of the tape-shaped insulating material include a flexible organic insulating material such as a polymer film.
【0037】第1の実施例(図1)において、巻線7を
樹脂モールドして乾式変圧器を構成する場合には、巻線
7の少なくとも鉄心2に対応する面たるモールド樹脂に
断熱性を有する機械的強度の大なる絶縁材を埋設或いは
付設し、鉄心脚部3部分の断熱材5を省略するようにし
てもよい。このようにすれば、第2の実施例と同様の効
果が得られる。In the first embodiment (FIG. 1), when the winding 7 is resin-molded to form a dry transformer, at least the surface molding resin corresponding to the iron core 2 of the winding 7 has heat insulation. An insulating material having high mechanical strength may be embedded or provided, and the heat insulating material 5 in the iron core leg 3 may be omitted. By doing so, the same effect as in the second embodiment can be obtained.
【0038】本発明の第1の実施例の説明中に記載した
とおり、積層鉄心は圧延鋼板の積層方向に比べ圧延され
た鋼板面方向への熱伝導性が良いため、発生した熱はこ
の鋼板面方向に熱伝導され易く、そのため鉄心2の表面
は圧延鋼板の積層方向側の両表面(図2における前,後
面)に比べその両表面と直交する表面(図2における鉄
心2の上下面,左右側面)が高温になる。従って、本発
明の変圧器中身は、断熱手段を講ずるに当たり、鉄心2
の圧延鋼板の積層方向側の両表面と直交する表面にだけ
断熱手段を設けた構成としてもよい。これにより、鉄心
2の圧延鋼板の積層方向側の両表面からの放熱量は少な
いので、鉄心2は高温となり、変圧器の変換効率を上げ
ることができる。また、断熱手段の構成が簡単になる。As described in the description of the first embodiment of the present invention, since the laminated iron core has a higher thermal conductivity in the direction of the rolled steel sheet than in the laminating direction of the rolled steel sheet, the generated heat is not applied to this steel sheet. Heat is easily conducted in the plane direction, so that the surface of the iron core 2 is perpendicular to the two surfaces (the front and rear surfaces in FIG. 2) of the rolled steel sheet (the front and rear surfaces in FIG. 2). The left and right sides become hot. Therefore, the contents of the transformer according to the present invention require the core 2
The heat insulating means may be provided only on the surface orthogonal to both surfaces on the lamination direction side of the rolled steel sheet. Accordingly, since the amount of heat radiation from both surfaces of the iron core 2 on the lamination direction side of the rolled steel sheet is small, the temperature of the iron core 2 becomes high and the conversion efficiency of the transformer can be increased. Further, the configuration of the heat insulating means is simplified.
【0039】鉄心2は、鉄損を減少させたハイグレード
材料を用いてもよく、その場合には、鉄心2を高温にさ
せることによる相乗効果により、変換効率の高い変圧器
が実現できる。本発明の実施例では、三相変圧器に適用
したが、単相変圧器でもよい。本発明の実施例では、鉄
心2の構成はバッドジョイント方式の積層鉄心とした
が、ラップジョイント方式でもよい。The iron core 2 may be made of a high-grade material with reduced iron loss. In this case, a transformer with high conversion efficiency can be realized by a synergistic effect of increasing the temperature of the iron core 2. In the embodiment of the present invention, the present invention is applied to a three-phase transformer, but may be a single-phase transformer. In the embodiment of the present invention, the configuration of the iron core 2 is a laminated core of a bad joint type, but may be a lap joint type.
【0040】[0040]
【発明の効果】以上の記述で明らかなように、本発明の
変圧器は、一次巻線に電力を供給したときに鉄心内に発
生する熱の放熱を断熱手段で抑制し、鉄心が高温に保持
される構成にしたので、鉄心の鉄損が減少し、変換効率
が上がるという優れた効果を奏するものである。As is apparent from the above description, the transformer of the present invention suppresses heat radiation generated in the iron core when electric power is supplied to the primary winding by the heat insulating means, so that the iron core is heated to a high temperature. Since the configuration is held, the core loss of the iron core is reduced, and an excellent effect of increasing the conversion efficiency is achieved.
【図面の簡単な説明】[Brief description of the drawings]
【図1】本発明の第1の実施例を示す図で、(a)は図
2のA−A線に沿う断面図、(b)は図2のB−B線に
沿う断面図FIGS. 1A and 1B are diagrams showing a first embodiment of the present invention, in which FIG. 1A is a cross-sectional view taken along line AA in FIG. 2, and FIG. 1B is a cross-sectional view taken along line BB in FIG.
【図2】正面図FIG. 2 is a front view
【図3】鉄心の温度特性グラフFIG. 3 is a graph showing temperature characteristics of an iron core.
【図4】本発明の第2の実施例を示す図1相当図FIG. 4 is a view corresponding to FIG. 1, showing a second embodiment of the present invention;
【図5】本発明の第3の実施例を示す図1相当図FIG. 5 is a view corresponding to FIG. 1, showing a third embodiment of the present invention;
【図6】本発明の第4の実施例を示す図1相当図FIG. 6 is a view corresponding to FIG. 1, showing a fourth embodiment of the present invention;
【図7】本発明の第5の実施例を示す図1相当図FIG. 7 is a view corresponding to FIG. 1 showing a fifth embodiment of the present invention.
【図8】密閉容器の分解斜視図FIG. 8 is an exploded perspective view of a closed container.
【図9】本発明の第6の実施例を示す図1相当図FIG. 9 is a view corresponding to FIG. 1, showing a sixth embodiment of the present invention.
図面中、1,13,16,24,32は変圧器中身、2
は鉄心、5は断熱板(断熱手段)、6,15,31は接
着剤、7は巻線、9,12は支持物たるクランプ、14
は巻芯、17,18は支持物たるクランプ(断熱手
段)、20はタンク、21は窒素ガス、25,34は密
閉容器、30,33は間隔保持部材を示す。In the drawing, 1,13,16,24,32 are transformer contents,
Is an iron core, 5 is an insulating plate (insulating means), 6, 15, 31 are adhesives, 7 is a winding, 9, 12 are clamps serving as supports, 14
Denotes a winding core, 17 and 18 denote clamps (insulating means) serving as supports, 20 denotes a tank, 21 denotes nitrogen gas, 25 and 34 denote closed containers, and 30 and 33 denote spacing members.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) H01F 31/00 A S ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) H01F 31/00 AS
Claims (8)
中身を設けたことを特徴とする変圧器。1. A transformer, comprising: a transformer having an iron core, windings mounted on the iron core, and heat insulating means for suppressing heat radiation of the iron core.
構成されていることを特徴とする請求項1記載の変圧
器。2. The transformer according to claim 1, wherein the heat insulating means is made of a heat insulating material covering the entire surface of the iron core.
間に介在された断熱材を有して構成されていることを特
徴とする請求項1記載の変圧器。3. The transformer according to claim 1, wherein the heat insulating means has at least a heat insulating material interposed between the iron core and the winding.
は、断熱効果を有する機械的強度の大なる絶縁材で構成
されていることを特徴とする請求項1記載の変圧器。4. The transformer according to claim 1, wherein at least a part of the support for supporting the iron core is made of an insulating material having a high mechanical strength and a heat insulating effect.
断熱効果を有する機械的強度の大なる絶縁材で構成され
ていることを特徴とする請求項1記載の変圧器。5. The transformer according to claim 1, wherein at least a surface of the winding corresponding to the iron core is made of an insulating material having a mechanical strength and a heat insulating effect.
構成され、前記密閉容器内は真空にされていることを特
徴とする請求項1記載の変圧器。6. The transformer according to claim 1, wherein the heat insulating means is constituted by a closed container that stores an iron core, and the inside of the closed container is evacuated.
構成され、前記密閉容器内は耐熱分解性に優れたガスが
封入されていることを特徴とする請求項1記載の変圧
器。7. The transformer according to claim 1, wherein the heat insulating means is constituted by a closed container for accommodating an iron core, and the closed container is filled with a gas having excellent thermal decomposition resistance.
の変圧器中身は、タンク内に収納され、前記タンク内は
耐熱分解性に優れたガスが封入されていることを特徴と
する変圧器。8. The transformer according to any one of claims 1 to 5, wherein the contents of the transformer are housed in a tank, and the tank is filled with a gas having excellent thermal decomposition resistance. Transformer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32269399A JP2001143943A (en) | 1999-11-12 | 1999-11-12 | Transformer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32269399A JP2001143943A (en) | 1999-11-12 | 1999-11-12 | Transformer |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2001143943A true JP2001143943A (en) | 2001-05-25 |
Family
ID=18146569
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP32269399A Pending JP2001143943A (en) | 1999-11-12 | 1999-11-12 | Transformer |
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JP (1) | JP2001143943A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003031681A1 (en) * | 2001-10-05 | 2003-04-17 | Nippon Steel Corporation | Iron core exhibiting excellent insulating property at end face, and method for coating end face of iron core |
JP2008060305A (en) * | 2006-08-31 | 2008-03-13 | Toko Inc | Inverter transformer |
KR100815467B1 (en) | 2006-05-02 | 2008-03-26 | 디피씨(주) | Pass core of transformer |
KR100828037B1 (en) | 2005-02-02 | 2008-05-08 | 스미다 코포레이션 가부시키가이샤 | Magnetic element and method for the same |
KR101468437B1 (en) * | 2013-09-23 | 2014-12-03 | 일진전기 주식회사 | Furnace transformer being capable of preventing induction heating |
RU2564441C1 (en) * | 2014-06-16 | 2015-10-10 | Общество с ограниченной ответственностью "Трансформаторы и монтаж" | Method for interconnecting transformer core components |
JP2015225894A (en) * | 2014-05-26 | 2015-12-14 | 東芝産業機器システム株式会社 | Mold type stationary induction apparatus and manufacturing method therefor |
CN113903562A (en) * | 2021-10-14 | 2022-01-07 | 广东电网有限责任公司 | Dry-type transformer and preparation method and application thereof |
-
1999
- 1999-11-12 JP JP32269399A patent/JP2001143943A/en active Pending
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7471182B2 (en) | 2001-10-05 | 2008-12-30 | Nippon Steel Corporation | Core having superior end face insulation and method of treating core end faces to give insulation coating |
US7173509B2 (en) | 2001-10-05 | 2007-02-06 | Nippon Steel Corporation | Core having superior end face insulation and method of treating core end faces to give insulation coating |
WO2003031681A1 (en) * | 2001-10-05 | 2003-04-17 | Nippon Steel Corporation | Iron core exhibiting excellent insulating property at end face, and method for coating end face of iron core |
KR100828037B1 (en) | 2005-02-02 | 2008-05-08 | 스미다 코포레이션 가부시키가이샤 | Magnetic element and method for the same |
KR100815467B1 (en) | 2006-05-02 | 2008-03-26 | 디피씨(주) | Pass core of transformer |
JP4579884B2 (en) * | 2006-08-31 | 2010-11-10 | 東光株式会社 | Inverter transformer |
JP2008060305A (en) * | 2006-08-31 | 2008-03-13 | Toko Inc | Inverter transformer |
KR101468437B1 (en) * | 2013-09-23 | 2014-12-03 | 일진전기 주식회사 | Furnace transformer being capable of preventing induction heating |
WO2015041485A1 (en) * | 2013-09-23 | 2015-03-26 | 일진전기 주식회사 | Furnace transformer capable of preventing induction heat |
JP2015225894A (en) * | 2014-05-26 | 2015-12-14 | 東芝産業機器システム株式会社 | Mold type stationary induction apparatus and manufacturing method therefor |
US10026541B2 (en) | 2014-05-26 | 2018-07-17 | Toshiba Industrial Products And Systems Corporation | Molded stationary induction apparatus and method for manufacturing molded stationary induction apparatus |
RU2564441C1 (en) * | 2014-06-16 | 2015-10-10 | Общество с ограниченной ответственностью "Трансформаторы и монтаж" | Method for interconnecting transformer core components |
CN113903562A (en) * | 2021-10-14 | 2022-01-07 | 广东电网有限责任公司 | Dry-type transformer and preparation method and application thereof |
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