JPH01239906A - Gas insulated transformer - Google Patents
Gas insulated transformerInfo
- Publication number
- JPH01239906A JPH01239906A JP6770788A JP6770788A JPH01239906A JP H01239906 A JPH01239906 A JP H01239906A JP 6770788 A JP6770788 A JP 6770788A JP 6770788 A JP6770788 A JP 6770788A JP H01239906 A JPH01239906 A JP H01239906A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- tank
- insulating
- flow path
- plate
- 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
- 238000004804 winding Methods 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 238000005192 partition Methods 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 48
- 230000004907 flux Effects 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000013021 overheating Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Landscapes
- Transformer Cooling (AREA)
Abstract
Description
【発明の詳細な説明】
[発明の目的]
(産業上の利用分野)
本発明はSF6ガスのような絶縁性のガスを絶縁及び冷
却の媒体として用いたガス絶縁変圧器に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a gas insulated transformer using an insulating gas such as SF6 gas as an insulating and cooling medium.
(従来の技術)
最近、油入変圧器に代わる不燃性の変圧器として絶縁油
の代シに不燃性の絶縁ガス(例えばSF6ガス)を冷却
及び絶縁の媒体として用いる。(Prior Art) Recently, as a non-flammable transformer that replaces an oil-immersed transformer, a non-flammable insulating gas (for example, SF6 gas) is used as a cooling and insulating medium instead of insulating oil.
いわゆるガス絶縁変圧器が開発され、数10 MVA程
度の容量のものまで実用化されている。このようなガス
絶縁変圧器においては、油入変圧器の絶縁油に比べ絶縁
ガスは絶縁特性は向上するものの冷却特性は劣る。この
ため、鉄心や巻線の内部の冷却方式はガスを強制的に流
して冷却特性を高めるようKしておシ、強制対流にする
ことによシ絶縁ガスによっても絶縁油の自然対流並の冷
却特性は得られるようKなる。この強制対流を行うため
Kは鉄心や巻線へ絶縁ガスを送るための送風機が用いら
れ、更に鉄心や巻線内のガス流速を上げるため絶縁ガス
のタンク内入口側と出口側に差圧を設けるようタンク内
を上、下に仕切るガス仕切板が取付けられている。So-called gas insulated transformers have been developed and have been put into practical use with capacities of several tens of MVA. In such a gas insulated transformer, although the insulating gas has improved insulation properties compared to the insulating oil of an oil-immersed transformer, its cooling properties are inferior. For this reason, the cooling method inside the iron core and windings is such that gas is forced to flow to improve the cooling characteristics. The cooling properties are K as obtained. To perform this forced convection, a blower is used to send insulating gas to the core and windings, and a differential pressure is applied between the inlet and outlet sides of the insulating gas tank to increase the gas flow velocity within the core and windings. A gas partition plate is installed to divide the inside of the tank into upper and lower parts.
(発明が解決しようとする課題)
しかしこのようなガス絶縁変圧器では容量あるいはイン
ピーダンス電圧が大きい変圧器では巻線のもれ磁束が増
加し、このようなもれ磁束が変圧器内の金属構造物やタ
ンク壁に鎖交すると、渦電流が発生し加熱する。油入変
圧器でも同様の現象が発生するが、前述したように絶縁
ガスの冷却特性は自然対流では絶縁油の1/10以下で
あるため、ガス絶縁変圧器では油入変圧器に比べ小容量
、低インピーダンス電圧でもこの問題が顕在化する。(Problem to be solved by the invention) However, in such a gas-insulated transformer, leakage magnetic flux of the winding increases in a transformer with a large capacity or impedance voltage, and this leakage magnetic flux can cause damage to the metal structure inside the transformer. When linked to objects or tank walls, eddy currents are generated and heated. A similar phenomenon occurs in oil-immersed transformers, but as mentioned above, the cooling properties of insulating gas are less than 1/10 of insulating oil in natural convection, so gas-insulated transformers have a smaller capacity than oil-immersed transformers. , this problem becomes apparent even at low impedance voltages.
油入変圧器においてはタンク壁の過熱対策としてタンク
内壁面に活ってアルi製の電磁シールド板をはって磁束
の集中を避けたシ、ケイ素鋼板の磁気シールドによシタ
ンク壁に入射する磁束量を減らして対処しているが、ガ
ス絶縁変圧器でも同様の対策が必要となる。しかしなが
ら、このような対策を講することKよシ、材料費の高謄
や取付作業のための製作時間が増える等変圧器のコスト
アップが避けられず、また冷却特性の低さから同様の対
策をとっても十分な冷却性能が得られず。In oil-immersed transformers, as a countermeasure against overheating of the tank wall, an electromagnetic shield plate made of aluminum is installed on the inner wall of the tank to avoid concentration of magnetic flux, and a magnetic shield made of silicon steel plate prevents the concentration of magnetic flux from entering the tank wall. This has been dealt with by reducing the amount of magnetic flux, but similar measures are required for gas-insulated transformers. However, taking such measures will inevitably increase the cost of the transformer, such as higher material costs and increased manufacturing time for installation work, and also, due to the poor cooling characteristics, similar measures will not be necessary. However, sufficient cooling performance could not be obtained.
大容量化が図れない。Unable to increase capacity.
本発明は前記の課題に対して、タンク壁にシールドを取
シ付けることなく、タンク壁の過熱を防止し、安価で製
作の容易な大容量化に適するガス絶縁変圧器を得ること
を目的とする。The present invention has been made to solve the above-mentioned problems, and aims to provide a gas insulated transformer that prevents overheating of the tank wall without attaching a shield to the tank wall, is inexpensive, easy to manufacture, and is suitable for increasing capacity. do.
[発明の構成コ
(課題を解決するための手段)
本発明は以上の目的を達成するだめに、タンク壁内面で
巻線に対向する部分にガス流路を設け、このガス流路内
に絶縁ガスを強制的に流すようにしたものである。[Structure of the Invention (Means for Solving the Problems) In order to achieve the above object, the present invention provides a gas flow path in a portion of the inner surface of the tank wall facing the winding, and insulates the gas flow path. It is designed to force gas to flow.
(作用)
絶縁ガスは自然対流では冷却特性は悪いが、強制対流に
よシ熱伝達率を向上し、絶縁油の自然対流と同等の熱伝
達率とすることができる。仮にタンク壁との間に4 m
mの間隙を設け、この間隙内に4 %’lの流速でSF
6ガスを流すとするとガス圧1、25 kg/diでは
熱伝達率は約110 w/rd℃となシ、絶縁油の自然
対流熱伝達率と同等となる。(Function) Natural convection of insulating gas has poor cooling properties, but forced convection improves the heat transfer coefficient, making it possible to achieve a heat transfer coefficient equivalent to that of natural convection of insulating oil. If there is a distance of 4 m between the tank wall and
A gap of m is provided, and SF is applied at a flow rate of 4%'l within this gap.
When 6 gases are flowing, at a gas pressure of 1.25 kg/di, the heat transfer coefficient is approximately 110 w/rd°C, which is equivalent to the natural convection heat transfer coefficient of insulating oil.
(実施例)
以下、本発明の一実施例を第1図乃至第3図によシ説明
する。(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.
第1図、第2図に示すように鉄心1およびこの鉄心1に
巻回された巻線2をタンク3内に絶縁ガス4と共に収納
し、タンク3内部は絶縁ガス4の入口側と出口側とに差
圧を設け、鉄心1や巻線2内にガスが流れるようにする
ために仕切板8で上。As shown in FIGS. 1 and 2, the iron core 1 and the winding 2 wound around the iron core 1 are housed in a tank 3 together with an insulating gas 4, and the inside of the tank 3 has an inlet side and an outlet side of the insulating gas 4. A partition plate 8 is provided at the top to provide a differential pressure between and to allow gas to flow into the iron core 1 and winding 2.
下に区分されている。また、タンク3の外部には送風機
6を介してガス冷却器5が接続されている。It is categorized below. Further, a gas cooler 5 is connected to the outside of the tank 3 via a blower 6.
一方、タンク壁7の内面側にタンク壁7と巻線2との間
に絶縁性の板10をタンク壁7から例えば4 ms程度
の間隙をとりて取り付け、この板10とタンク壁7間を
ガス流路9のガス入口側と出口側に差圧をつける必要が
ある。On the other hand, an insulating plate 10 is attached to the inner surface of the tank wall 7 between the tank wall 7 and the winding 2 with a gap of, for example, about 4 ms from the tank wall 7. It is necessary to create a pressure difference between the gas inlet and outlet sides of the gas flow path 9.
したがって、前記の仕切板8をガス流路9の板10の内
側に接合し、この部分で絶縁ガス4を上。Therefore, the above-mentioned partition plate 8 is joined to the inside of the plate 10 of the gas flow path 9, and the insulating gas 4 is directed upward at this portion.
下に区分する。仕切板8とガス流路9の板10との接合
部でガスもれが生じないようにガス止め1ノを取シ付け
る。また、タンク壁7と板10との間隙をとるため第2
図に示すように板10に垂直方向のスペーサ12を取シ
付ける。スペーサ12は図示のように長いものである必
要はなく、間隙が確保できる構造であれば良い。また、
夕/り壁7の温度上昇が著しくなるのは巻線に近い部分
なので板10の取付範囲はタンク内壁全周に渡る必要は
なく、第3図に示すように巻線2に近接する面のみでよ
い、板10の固定はタンク壁7内面に?ルト固定用の座
13を取シ付け、この晟13/C板10を絶縁ボルト1
4で固定する。このようにするとガス流路9内に流れる
絶縁ガス量は巻線2や鉄心1内のダクトに絶縁ガスが流
れる時の圧力損失でバランスする量となる。流量を調節
するためにはガス流路9の間隙寸法を変えるか。Classify below. A gas stopper 1 is installed to prevent gas leakage at the joint between the partition plate 8 and the plate 10 of the gas passage 9. In addition, in order to secure a gap between the tank wall 7 and the plate 10,
As shown in the figure, a vertical spacer 12 is attached to the plate 10. The spacer 12 does not need to be as long as shown in the drawings, and may have any structure as long as it can ensure a gap. Also,
Since the temperature of the wall 7 increases significantly in the area near the winding, the mounting range of the plate 10 does not need to cover the entire circumference of the inner wall of the tank, but only on the surface close to the winding 2, as shown in Fig. 3. Is it okay to fix the plate 10 to the inner surface of the tank wall 7? Install the seat 13 for fixing the bolt, and attach the insulating bolt 1 to this 13/C plate 10.
Fix it at 4. In this way, the amount of insulating gas flowing in the gas flow path 9 becomes an amount that is balanced by the pressure loss when the insulating gas flows into the duct in the winding 2 and the iron core 1. Should the gap size of the gas flow path 9 be changed in order to adjust the flow rate?
ガス流路面積を減らすための調整片を取力付けるように
すれはよい。It is easy to apply force to the adjustment piece to reduce the gas flow area.
[発明の効果]
以上のように本発明によれば、鉄心及び巻線を収納する
タンクと、このタンク内に封入された絶縁ガスと、この
絶縁ガスを冷却するガス冷却器を有するものにおいて、
タンクの内壁面と巻線との間に絶縁性の板を配置し、こ
の板とタンクの内壁面との間にガス流路を設けるように
したので、タンク壁の過熱を防止し、安価で製作の容易
な大容量化に適するガス絶縁変圧器を得ることができる
。[Effects of the Invention] As described above, according to the present invention, in an apparatus having a tank for storing an iron core and a winding, an insulating gas sealed in the tank, and a gas cooler for cooling the insulating gas,
An insulating plate is placed between the inner wall of the tank and the winding, and a gas flow path is provided between this plate and the inner wall of the tank, which prevents overheating of the tank wall and is inexpensive. A gas insulated transformer that is easy to manufacture and suitable for increasing capacity can be obtained.
第1図は本発明のガス絶縁変圧器の一実施例を示す断面
図、第2図は本発明におけるガス流路を示す要部拡大図
、第3図はガス流路の取付範囲を示す平面図である。
1・・・鉄心、2・・・巻線、3・・・タンク、4・・
・絶縁ガス、5・・・ガス冷却器、7・・・タンク壁、
8・・・仕切板、9・・・ガス流路、10−・・板。
出願人代理人 弁理士 鈴 江 武 彦第3図Fig. 1 is a sectional view showing one embodiment of the gas insulated transformer of the present invention, Fig. 2 is an enlarged view of the main part showing the gas flow path in the present invention, and Fig. 3 is a plane showing the installation range of the gas flow path. It is a diagram. 1... Iron core, 2... Winding wire, 3... Tank, 4...
・Insulating gas, 5... Gas cooler, 7... Tank wall,
8... Partition plate, 9... Gas flow path, 10-... Board. Applicant's agent Patent attorney Takehiko Suzue Figure 3
Claims (1)
された絶縁ガスと、この絶縁ガスを冷却するガス冷却器
を有するガス絶縁変圧器において、前記タンクの内壁面
と巻線との間に絶縁性の板を配置し、この板とタンクの
内壁面との間にガス流路を設けたことを特徴とするガス
絶縁変圧器。In a gas insulated transformer having a tank for storing an iron core and a winding, an insulating gas sealed in the tank, and a gas cooler for cooling the insulating gas, there is a space between the inner wall of the tank and the winding. A gas insulated transformer characterized in that an insulating plate is arranged and a gas flow path is provided between the plate and the inner wall surface of a tank.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63067707A JP2554696B2 (en) | 1988-03-22 | 1988-03-22 | Gas insulated transformer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63067707A JP2554696B2 (en) | 1988-03-22 | 1988-03-22 | Gas insulated transformer |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01239906A true JPH01239906A (en) | 1989-09-25 |
JP2554696B2 JP2554696B2 (en) | 1996-11-13 |
Family
ID=13352699
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63067707A Expired - Fee Related JP2554696B2 (en) | 1988-03-22 | 1988-03-22 | Gas insulated transformer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2554696B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011082414A (en) * | 2009-10-09 | 2011-04-21 | Toshiba Corp | Gas-insulated transformer |
-
1988
- 1988-03-22 JP JP63067707A patent/JP2554696B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011082414A (en) * | 2009-10-09 | 2011-04-21 | Toshiba Corp | Gas-insulated transformer |
Also Published As
Publication number | Publication date |
---|---|
JP2554696B2 (en) | 1996-11-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |