JP2000223322A - Transformer - Google Patents
TransformerInfo
- Publication number
- JP2000223322A JP2000223322A JP11023137A JP2313799A JP2000223322A JP 2000223322 A JP2000223322 A JP 2000223322A JP 11023137 A JP11023137 A JP 11023137A JP 2313799 A JP2313799 A JP 2313799A JP 2000223322 A JP2000223322 A JP 2000223322A
- Authority
- JP
- Japan
- Prior art keywords
- transformer
- body case
- bushing
- filled
- case
- 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.)
- Granted
Links
- 239000011261 inert gas Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 abstract description 11
- 239000004020 conductor Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910018503 SF6 Inorganic materials 0.000 description 4
- 229960000909 sulfur hexafluoride Drugs 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Landscapes
- Transformer Cooling (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、変電所などで使用
される変圧器に関するものであり、特に、巻線及び鉄心
等を収容した変圧器本体ケース内に絶縁媒体としての油
及び六フッ化イオウ（ＳＦ6）ガスのような不活性ガス
を封入した変圧器に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer used in a substation and the like, and more particularly, to an oil and hexafluoride as an insulating medium in a transformer body case containing a winding and an iron core. The present invention relates to a transformer filled with an inert gas such as sulfur (SF 6 ) gas.
【０００２】[0002]
【従来の技術】従来、変圧器は、種々の構造のものが使
用されているが、例えば変電所で昇圧のために使用され
る変圧器においては、巻線及び鉄心等の変圧器構成部品
を絶縁し、又、直接冷却するために、これらを密封タン
クとされる変圧器本体ケース内に納め、ケース内には油
を封入した構造のものがある。その一例を図3に示す。2. Description of the Related Art Conventionally, transformers of various structures have been used. For example, in a transformer used for boosting in a substation, transformer components such as windings and iron cores are used. In order to insulate and cool directly, these are housed in a transformer body case which is a sealed tank, and there is a structure in which oil is sealed in the case. An example is shown in FIG.
【０００３】本例によると、変圧器１００は、変圧器本
体ケース１０１を有し、その中に巻線及び鉄心等の変圧
器構成部品１０２が収納されている。変圧器本体ケース
１０１内には、絶縁媒体として油１０３が充填され、ケ
ース１０１の上部空間部には、油１０３が空気と接触し
て劣化するのを防止するために、不活性ガス、例えば六
フッ化イオウ（ＳＦ6）ガス１０４が充満されている。
この六フッ化イオウ（ＳＦ6）ガス１０４を充満したケ
ース１０１の上部空間部は、管１０６により、ケース上
壁外面１０１Ａに設置したコンサベータ１０５と連通さ
れている。According to this embodiment, a transformer 100 has a transformer main body case 101 in which a transformer component 102 such as a winding and an iron core is housed. The transformer body case 101 is filled with oil 103 as an insulating medium, and an upper space of the case 101 is filled with an inert gas, for example, six in order to prevent the oil 103 from being deteriorated due to contact with air. Sulfur fluoride (SF 6 ) gas 104 is filled.
The upper space of the case 101 filled with the sulfur hexafluoride (SF 6 ) gas 104 is communicated by a tube 106 with a conservator 105 installed on the outer surface 101A of the case upper wall.
【０００４】変圧器本体ケース１０１内の油１０３は、
周囲温度及び負荷の変化に伴い、その温度が変化し、従
って、その容積が膨張、収縮して変動するが、このよう
な油１０３の膨張、収縮は、六フッ化イオウ（ＳＦ6）
ガス１０４を貯留したコンサベータ１０５により吸収さ
れる。[0004] The oil 103 in the transformer body case 101 is
The temperature changes with the change of the ambient temperature and the load, and therefore the volume expands and contracts and fluctuates. Such expansion and contraction of the oil 103 is caused by sulfur hexafluoride (SF 6 ).
The gas 104 is absorbed by the conservator 105 storing the gas.
【０００５】又、ケース１０１の上壁外面１０１Ａに
は、高圧ブッシング１が取り付けられており、低圧ブッ
シング１０７は、例えばケース１０１の側壁面１０１Ｂ
に設置されている。A high-pressure bushing 1 is attached to the outer surface 101A of the upper wall of the case 101, and the low-pressure bushing 107 is, for example, a side wall surface 101B of the case 101.
It is installed in.
【０００６】斯かる変圧器１００に使用されている高圧
ブッシング、即ち、Ｔ形ブッシング１は、内部にＴ形状
の接続導体３を一体に成型した、通常エポキシ樹脂で作
製されたＴ形ブッシングモールド２を有し、支持金具４
にて変圧器本体ケース１０１に固定される。The high-pressure bushing used in the transformer 100, that is, the T-shaped bushing 1, is a T-shaped bushing mold 2 usually made of epoxy resin, in which a T-shaped connection conductor 3 is integrally molded. And a support fitting 4
Is fixed to the transformer body case 101.
【０００７】Ｔ形ブッシングモールド２の水平部２Ａに
は、本例では図面右側には高圧側ケーブル３０の通電接
続部、即ち、ケーブル接続材料（オス側）３１が装着さ
れ、又、他方側（図面左側）には絶縁栓５０が装着され
ている。[0007] In the present embodiment, on the right side of the drawing, a current-carrying connection portion of a high-voltage side cable 30, that is, a cable connection material (male side) 31 is attached to the horizontal portion 2A of the T-shaped bushing mold 2, and the other side ( An insulation plug 50 is mounted on the left side of the drawing).
【０００８】変圧器本体ケース１０１内にて、高圧ブッ
シング１の接続端子６は、ケース内にて変圧器入力端子
１０８に接続される。又、低圧ブッシング１０７の接続
端子１０９は、変圧器の出力端子１１０に接続される。In the transformer main body case 101, the connection terminal 6 of the high-voltage bushing 1 is connected to the transformer input terminal 108 in the case. The connection terminal 109 of the low-voltage bushing 107 is connected to the output terminal 110 of the transformer.
【０００９】更に、上記構成の従来の変圧器１００は、
高圧ブッシング１に隣接して変流器２００が設置されて
おり、送電ケーブル３０に流れる電流を計測して送電状
態を常時監視している。Further, the conventional transformer 100 having the above configuration is
A current transformer 200 is installed adjacent to the high-pressure bushing 1 and constantly monitors a power transmission state by measuring a current flowing through the power transmission cable 30.
【００１０】[0010]
【発明が解決しようとする課題】上述のように構成され
た従来の変圧器１００は、変圧器本体ケース１０１の上
部に、コンサベータ１０５、変流器２００などが設置さ
れており、変圧器１００の大型化の一因となっており、
小型化が望まれていた。In the conventional transformer 100 configured as described above, a transformer 105, a current transformer 200, and the like are installed above a transformer body case 101. Has contributed to the size of
Miniaturization was desired.
【００１１】更に、変圧器１００に送電ケーブル３０を
接続する作業においては、高圧ブッシング１に接続され
る送電ケーブル３０に変流器２００を装着しなければな
らないといった作業上の煩雑さがあった。Further, in the operation of connecting the power transmission cable 30 to the transformer 100, there is a complicated operation such that the current transformer 200 must be mounted on the power transmission cable 30 connected to the high-voltage bushing 1.
【００１２】従って、本発明の目的は、コンサベータを
不要とし、更に、変圧器本体ケース内に変流器を備えて
おり、小型化を達成すると共に、変圧器に送電ケーブル
を接続するに際しての作業上の煩雑さをもなくすること
のできる変圧器を提供することである。Accordingly, it is an object of the present invention to eliminate the need for a conservator and to provide a current transformer in a transformer main body case to achieve downsizing and to connect a power transmission cable to the transformer. An object of the present invention is to provide a transformer that can eliminate the complicated operation.
【００１３】[0013]
【課題を解決するための手段】上記目的は本発明に係る
変圧器にて達成される。要約すれば、本発明は、変圧器
本体ケースの上壁外面に、高圧側ケーブルの接続材料が
装着される高圧ブッシングを設置し、変圧器本体ケース
内には絶縁媒体を充填し、且つ、変圧器本体ケース内の
上部空間部には、不活性ガスが充満されている変圧器に
おいて、前記変圧器本体ケース内に位置した前記高圧ブ
ッシングの垂直モールド部に変流器を設置したことを特
徴とする変圧器である。The above object is achieved by a transformer according to the present invention. In summary, the present invention provides a high-voltage bushing on which a connection material for a high-voltage side cable is mounted on an outer surface of an upper wall of a transformer body case, fills the transformer body case with an insulating medium, In a transformer filled with an inert gas, a current transformer is installed in a vertical mold part of the high-pressure bushing located in the transformer body case, in an upper space portion in the transformer body case. Transformer.
【００１４】本発明の一実施態様によると、前記変圧器
本体ケース内の絶縁媒体は、その油面が、前記垂直モー
ルド部を構成するベルマウス部の下方位置より上方の位
置とされるまで前記変圧器本体ケース内に充満される。According to an embodiment of the present invention, the insulating medium in the transformer main body case is kept in the above-mentioned state until the oil level is higher than a position below a bell mouth part constituting the vertical mold part. Filled in the transformer body case.
【００１５】[0015]
【発明の実施の形態】以下、本発明に係る変圧器を図面
に則して更に詳しく説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a transformer according to the present invention will be described in more detail with reference to the drawings.
【００１６】図１に本発明の変圧器１００の一実施例を
示す。本実施例によると、従来と同様に、変圧器１００
は、密封された変圧器本体ケース１０１を有し、その中
に巻線及び鉄心等の変圧器構成部品１０２が収納されて
いる。変圧器本体ケース１０１内には、絶縁媒体として
の油１０３が充填され、ケース１０１の上部空間部に
は、油１０３が空気と接触して劣化するのを防止するた
めに、不活性ガス、例えば六フッ化イオウ（ＳＦ6）ガ
ス１０４が充満されている。FIG. 1 shows an embodiment of a transformer 100 according to the present invention. According to the present embodiment, the transformer 100
Has a sealed transformer main case 101 in which transformer components 102 such as windings and iron cores are housed. The transformer body case 101 is filled with oil 103 as an insulating medium, and an upper space portion of the case 101 is filled with an inert gas such as an inert gas in order to prevent the oil 103 from contacting with air and being deteriorated. Sulfur hexafluoride (SF 6 ) gas 104 is filled.
【００１７】本発明の変圧器１００によれば、ケース１
０１の上壁外面１０１Ａには、高圧ブッシング１が取り
付けられているが、従来、ケース上壁外面１０１Ａに設
置されていたコンサベータ１０５（図３）は設けられて
いない。低圧ブッシング１０７は、例えば、ケース１０
１の側壁面１０１Ｂに設置されている。According to the transformer 100 of the present invention, the case 1
The high pressure bushing 1 is attached to the upper wall outer surface 101A of the case 01, but the conservator 105 (FIG. 3) conventionally provided on the case upper wall outer surface 101A is not provided. The low-pressure bushing 107 is, for example, a case 10
It is installed on one side wall surface 101B.
【００１８】本発明に使用される高圧ブッシング、即
ち、Ｔ形ブッシング１の一実施例を図２をも参照して説
明する。An embodiment of a high-pressure bushing, that is, a T-shaped bushing 1 used in the present invention will be described with reference to FIG.
【００１９】Ｔ形ブッシング１は、内部にＴ形状の接続
導体３を一体に成型した、通常エポキシ樹脂で作製され
たＴ形ブッシングモールド２を有する。即ち、Ｔ形ブッ
シングモールド２は、スリーブ状の接続導体３Ａを一体
に成型した水平部２Ａと、この接続導体３Ａから下方へ
と垂直に延在した通電導体３Ｂを内部に一体に成型した
垂直部２Ａとにて構成される。このＴ形ブッシングモー
ルド２は、その表面に導電塗料が塗布され、又、支持金
具４にて変圧器本体ケース１０１に固定される。The T-shaped bushing 1 has a T-shaped bushing mold 2 in which a T-shaped connection conductor 3 is integrally molded and usually made of epoxy resin. That is, the T-shaped bushing mold 2 includes a horizontal portion 2A integrally formed with a sleeve-shaped connection conductor 3A, and a vertical portion integrally formed with a current-carrying conductor 3B extending vertically downward from the connection conductor 3A. 2A. The T-shaped bushing mold 2 is coated with a conductive paint on its surface, and is fixed to the transformer body case 101 by the support fitting 4.
【００２０】Ｔ形ブッシングモールド２の水平部２Ａに
は、本実施例では図面右側には送電ケーブルとされる高
圧側ケーブル３０の通電接続部、即ち、ケーブル接続材
料（オス側）３１が装着され、又、他方側（図面左側）
には絶縁栓５０が装着される。In the horizontal portion 2A of the T-shaped bushing mold 2, a current-carrying connection portion of a high-voltage cable 30, which is a power transmission cable, that is, a cable connection material (male side) 31 is mounted on the right side of the drawing in this embodiment. , And the other side (left side in the drawing)
Is provided with an insulating plug 50.
【００２１】本実施例にて、高圧用ケーブル３０のケー
ブル接続材料（オス側）３１は、当業者には周知のプレ
ハブ構造とされ、ケーブル３０の先端部に形成された接
続端子（プラグ及びマルチラムバンド）３２、ストレス
コーン３３、ケーブル保護金具３４、圧縮装置３５など
の接続部品により、上記ブッシング内接続部のスリーブ
状導体３Ａに接続される。絶縁栓５０は、絶縁棒５１、
及びこの絶縁棒５１の周囲に形成されたストレスコーン
５２、蓋５３、圧縮装置５４などの絶縁栓部品によりブ
ッシング１の母線接続端部とは反対側の端部を電気的に
封鎖する。絶縁栓５０を除去することにより、この接続
端部に耐電圧試験ケーブルの接続材料を接続することが
可能となる。In this embodiment, the cable connection material (male side) 31 of the high-voltage cable 30 has a prefabricated structure known to those skilled in the art, and connection terminals (plug and multi-wire) formed at the distal end of the cable 30. Connecting parts such as a ram band 32, a stress cone 33, a cable protection fitting 34, and a compression device 35 are connected to the sleeve-shaped conductor 3 </ b> A at the connection part in the bushing. The insulating plug 50 includes an insulating rod 51,
Insulating plug parts such as a stress cone 52, a lid 53, and a compression device 54 formed around the insulating rod 51 electrically close the end of the bushing 1 opposite to the bus connection end. By removing the insulating plug 50, it is possible to connect the connection material of the withstand voltage test cable to this connection end.
【００２２】変圧器本体ケース１０１内にて、高圧ブッ
シング１の接続端子６は、変圧器入力端子１０８に接続
され、又、低圧ブッシング１０７の接続端子１０９は、
変圧器出力端子１０９に接続される。In the transformer body case 101, the connection terminal 6 of the high voltage bushing 1 is connected to the transformer input terminal 108, and the connection terminal 109 of the low voltage bushing 107 is
Connected to transformer output terminal 109.
【００２３】本発明によれば、Ｔ形ブッシングモールド
２の垂直部２Ｂは、従来のものに比較するとその長さが
長く、例えば、従来の１０倍程度とされる。そして、こ
の垂直部２Ｂに、好ましくは、ケース上壁１０１Ａに近
接した領域に位置して、変流器２００が設置される。変
流器２００は、このＴ形ブッシングモールド２の垂直部
２Ｂ内部の通電導体３Ｂに流れる電流を計測して送電状
態を常時監視することができる。According to the present invention, the length of the vertical portion 2B of the T-shaped bushing mold 2 is longer than that of the conventional one, for example, about ten times that of the conventional one. The current transformer 200 is installed on the vertical portion 2B, preferably in a region close to the case upper wall 101A. The current transformer 200 can constantly monitor the power transmission state by measuring the current flowing through the current-carrying conductor 3B inside the vertical portion 2B of the T-shaped bushing mold 2.
【００２４】本発明では、変圧器１００内に充満される
絶縁媒体は、その油面１０４Ａが、Ｔ形ブッシングモー
ルド２の垂直部２Ｂを構成するベルマウス部の下方位置
より若干上方の位置にまで達するように、変圧器本体ケ
ース１０１内に充填される。According to the present invention, the insulating medium filled in the transformer 100 has an oil surface 104A whose position is slightly higher than the position below the bell mouth portion constituting the vertical portion 2B of the T-shaped bushing mold 2. The transformer body case 101 is filled so as to reach the temperature.
【００２５】本発明によれば、コンサベータを設けるこ
となく、変圧器本体ケース内の油が周囲温度及び負荷の
変化に伴い発生する油の膨張、収縮を六フッ化イオウ
（ＳＦ 6）ガス１０４を充満したケース上部空間部にて
吸収し得る。According to the present invention, it is possible to provide a conservator.
Oil in the transformer body case
Sulfur hexafluoride
(SF 6) In the upper space of the case filled with gas 104
Can be absorbed.
【００２６】又、本発明によれば、上述のように、変流
器２００をケース１０１内に収め、又、コンサベータ１
０５をなくすことができたので、変圧器全体の大きさを
大幅に小型化することができる。According to the present invention, the current transformer 200 is housed in the case 101 and the
Since the step 05 can be eliminated, the size of the entire transformer can be significantly reduced.
【００２７】更に、変圧器１００に送電ケーブル３０を
接続する作業においても、変流器２００は、予め高圧ブ
ッシング１に取り付けられているので、接続された送電
ケーブル３０に変流器２００を装着しなければならない
といった作業上の煩雑さも解消される。Further, in the operation of connecting the power transmission cable 30 to the transformer 100, the current transformer 200 is attached to the high-voltage bushing 1 in advance, so that the current transformer 200 is mounted on the connected power transmission cable 30. Work complexity such as the necessity of having to do so is also eliminated.
【００２８】[0028]
【発明の効果】以上説明したように、本発明の変圧器
は、変圧器本体ケースの上壁外面に、高圧側ケーブルの
接続材料が装着される高圧ブッシングを設置し、変圧器
本体ケース内には絶縁媒体を充填し、且つ、変圧器本体
ケース内の上部空間部には、不活性ガスが充満されてい
る変圧器において、変圧器本体ケース内に位置した高圧
ブッシングの垂直モールド部に変流器を設置した構成と
されるので、コンサベータを不要とし、更に、変流器
は、変圧器本体ケース内に設けられるので、小型化を達
成すると共に、変圧器に送電ケーブルを接続するに際し
ての作業上の煩雑さをもなくすることができる。As described above, in the transformer of the present invention, the high-voltage bushing to which the connection material for the high-voltage side cable is attached is installed on the outer surface of the upper wall of the transformer main body case, and the high-voltage bushing is installed in the transformer main body case. In a transformer filled with an insulating medium and filled with an inert gas in an upper space in the transformer body case, a current flows into a vertical mold portion of a high-pressure bushing located in the transformer body case. The transformer is installed so that a conservator is not required.Furthermore, the current transformer is provided in the transformer body case, so that the size can be reduced and the power transmission cable can be connected to the transformer. Work complexity can be eliminated.
【図１】本発明に係る変圧器の一実施例を示す概略構成
図である。FIG. 1 is a schematic configuration diagram showing one embodiment of a transformer according to the present invention.
【図２】高圧ブッシングの一実施例を示す概略構成図で
ある。FIG. 2 is a schematic configuration diagram showing one embodiment of a high-pressure bushing.
【図３】従来の変圧器の概略構成図である。FIG. 3 is a schematic configuration diagram of a conventional transformer.
１ 高圧ブッシング ２Ｂ 垂直モールド部 ３ 通電導体 ３０ 高圧側ケーブル ３１ ケーブル接続材料 １０１ 変圧器本体ケース １０３ 絶縁媒体（油） １０４ 不活性ガス １０５ コンサベータ ２００ 変流器 DESCRIPTION OF SYMBOLS 1 High-pressure bushing 2B Vertical mold part 3 Current-carrying conductor 30 High-voltage side cable 31 Cable connection material 101 Transformer body case 103 Insulation medium (oil) 104 Inert gas 105 Conservator 200 Current transformer
Claims (2)
ケーブルの接続材料が装着される高圧ブッシングを設置
し、変圧器本体ケース内には絶縁媒体を充填し、且つ、
変圧器本体ケース内の上部空間部には、不活性ガスが充
満されている変圧器において、 前記変圧器本体ケース内に位置した前記高圧ブッシング
の垂直モールド部に変流器を設置したことを特徴とする
変圧器。1. A high-voltage bushing on which a connection material for a high-voltage cable is mounted is installed on an outer surface of an upper wall of a transformer main body case, an insulating medium is filled in the transformer main case, and
An upper space in the transformer body case is filled with an inert gas, and a current transformer is installed in a vertical mold portion of the high-pressure bushing located in the transformer body case. And transformer.
は、その油面が、前記垂直モールド部を構成するベルマ
ウス部の下方位置より上方の位置とされるまで前記変圧
器本体ケース内に充満されることを特徴とする請求項１
の変圧器。2. The transformer medium case is filled with the insulating medium in the transformer body case until the oil level is higher than a position below a bell mouth part constituting the vertical mold part. 2. The method according to claim 1, wherein
Transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02313799A JP4875231B2 (en) | 1999-01-29 | 1999-01-29 | Transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02313799A JP4875231B2 (en) | 1999-01-29 | 1999-01-29 | Transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000223322A true JP2000223322A (en) | 2000-08-11 |
| JP4875231B2 JP4875231B2 (en) | 2012-02-15 |
Family
ID=12102172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02313799A Expired - Fee Related JP4875231B2 (en) | 1999-01-29 | 1999-01-29 | Transformer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4875231B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101650306B1 (en) * | 2015-03-25 | 2016-08-24 | 주식회사 평일 | inlet bushing for metering out fit |
| CN110211805A (en) * | 2019-06-27 | 2019-09-06 | 国网河北省电力有限公司沧州供电分公司 | Oil filling tool for transformer bushing |
-
1999
- 1999-01-29 JP JP02313799A patent/JP4875231B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101650306B1 (en) * | 2015-03-25 | 2016-08-24 | 주식회사 평일 | inlet bushing for metering out fit |
| CN110211805A (en) * | 2019-06-27 | 2019-09-06 | 国网河北省电力有限公司沧州供电分公司 | Oil filling tool for transformer bushing |
| CN110211805B (en) * | 2019-06-27 | 2022-03-01 | 国网河北省电力有限公司沧州供电分公司 | Oil filling tool for transformer bushing |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4875231B2 (en) | 2012-02-15 |
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