JPS6043807A - Oil-immersed apparatus with terminal box - Google Patents

Abstract

PURPOSE:To allow improvement in cooling performance and control of temperature rise, especially at bushings by providing vents on a bottom surface and an upper part of a terminal box covering the upper part of a heat dispersion part and equipping a blast means for circulation of cooled air flow. CONSTITUTION:A terminal box 4 for concealing bushings 3 is provided over an electrical device itself and a tank 1 containing insulating oil therein and having a heat dissipating part 2 such as a wave-shaped rib on the side thereof, and cables 6 are drawn out of lower parts of the both sides. A slit-like vent 8 is provided on the lower surface of the terminal box 4 and a hand hall is provided over the terminal box 4. A propeller fan 10 is mounted on a cover 5 of the hand hall and a vent 9 having a drip-proof cover is provided over the cover. Thus, external air is drawn up from the vent 8 and warmed air in the inside is exhausted from the upper vent 9 to promote heat-dissipation in the bushings 3. Upward air flow due to convection along the surface of the heat dissipation part is accelerated in the heat dissipation part 2.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は電気機器中身と絶縁油を収納し側面に放熱部を
有するタンクの上方に端子箱を設けた変圧器、リアクト
ル等の油入電気機器に関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to oil-filled electrical equipment, such as transformers and reactors, in which a terminal box is provided above a tank that houses the contents of electrical equipment and insulating oil and has a heat dissipation section on the side. Regarding.

〔発明の背景〕[Background of the invention]

最近の油入電気機器は、タンク上の帯電部（ブッシング
）を塩害等から保護するとともに保守上の安全を確保す
るため、タンク上に端子箱を設けて帯電部を隠蔽した構
造のものが多い。Recent oil-filled electrical equipment often has a structure in which a terminal box is installed above the tank to hide the charged part (bushing) in order to protect the charged part (bushing) on the tank from salt damage and ensure maintenance safety. .

第１図は従来の端子箱付油入電気機器の一例を示す。１
は電気機器中身と絶縁油を収納し側面に波形リプ等の放
熱部２を有するタンク、３はブッシング、４は端子箱、
５はハンドホールカバー、６はケーブルで、放熱部２か
らの放熱は矢印で示す空気の自然対流と熱放射により行
なっている。FIG. 1 shows an example of a conventional oil-filled electrical device with a terminal box. 1
is a tank that stores the contents of electrical equipment and insulating oil and has a heat dissipation part 2 such as a corrugated lip on the side, 3 is a bushing, 4 is a terminal box,
5 is a hand hole cover, 6 is a cable, and heat radiation from the heat radiation part 2 is performed by natural convection of air and heat radiation shown by arrows.

第２図は従来の端子箱付油入電気機器の他の例を示す。FIG. 2 shows another example of a conventional oil-filled electrical device with a terminal box.

本例は放熱部２の下に矢印で示すような上向のエアーカ
ーテン気流を発生する送風機７を設置して強制風冷を行
なうもので、他の構成は第１図と同じである。In this example, a blower 7 that generates an upward air curtain airflow as shown by the arrow is installed under the heat radiating section 2 to perform forced air cooling, and the other configurations are the same as in FIG. 1.

しかし、いずれの場合も端子箱４が放熱部２の上方を覆
うように設けられているため、放熱部２に沿った空気の
自然対流や強制風冷の風の流れが端子箱４で妨げられ、
特に放熱部２の最も高温となる上端に近い部分の放熱量
が低下して、十分な冷却効果が得られなかった。また、
端子箱４が密閉されていて空気の流通がないため、ブッ
シング３の温度が上がりやすく、ブッシングとタンク間
のシール材が熱劣化しやすいという問題点がちつた。そ
のため電流容量の大きい高価なブッシングを用いて温度
上昇を防止することが必要とされていた０ 動性能を向上させ、特にブッシングの温度上昇を改善し
て信頼性の高い端子箱付油入電気機器を得ることにある
。However, in either case, since the terminal box 4 is provided to cover the upper part of the heat radiating section 2, the natural convection of air and the flow of forced air cooling along the heat radiating section 2 are obstructed by the terminal box 4. ,
In particular, the amount of heat dissipated from the portion near the upper end where the temperature is highest of the heat dissipation section 2 decreased, and a sufficient cooling effect could not be obtained. Also,
Since the terminal box 4 is sealed and there is no air circulation, the temperature of the bushing 3 tends to rise, leading to problems such as thermal deterioration of the sealing material between the bushing and the tank. Therefore, it was necessary to use expensive bushings with large current capacity to prevent temperature rises.Oil-filled electrical equipment with terminal boxes that improve dynamic performance, especially the temperature rise of bushings, and are highly reliable. It's about getting.

〔発明の概要〕[Summary of the invention]

本発明は端子′ｆ市付油入電気機器において、タンク放
熱部の上を覆う端子箱の下面部と端子箱の上部とに通風
口を設け、かつこれら通風口を経てタンク放熱部と端子
箱内部に冷却風を流通させる送風手段を設けたことを特
徴とするものである。The present invention provides an oil-filled electrical equipment with a terminal 'f', in which ventilation holes are provided in the lower surface of the terminal box that covers the top of the tank heat radiation part and in the upper part of the terminal box, and through these ventilation holes, the tank heat radiation part and the terminal box are connected. It is characterized by being provided with a blower means for circulating cooling air inside.

〔発明の実施例〕[Embodiments of the invention]

本発明の一実施例を第５図に示す。本実施例は、電気機
器中身と絶縁油を収納し側面に波形リプ等の放熱部２を
有するタンク１の上方にブッシング６を隠蔽する端子箱
４を設け、端子箱４０両側下部からケーブル６を引＠墨
している点では第１図の従来例と同様であるが、タンク
放熱部２の上を覆う端子箱４の下面部にスリット状の通
風口８を設けである。また、端子箱内部の接続作業や保
守点検のため端子箱４の上部にはハンドホールな設ける
が、そのハンドホールカバー５にプロペラファン１０を
取り付け、その上方に防滴カバーを有する通風口９を設
けである。An embodiment of the present invention is shown in FIG. In this embodiment, a terminal box 4 that hides a bushing 6 is provided above a tank 1 that stores the contents of electrical equipment and insulating oil and has a heat dissipation part 2 such as a corrugated lip on the side, and a cable 6 is connected from the bottom of both sides of the terminal box 40. It is similar to the conventional example shown in FIG. 1 in that it is marked in black, but a slit-shaped ventilation hole 8 is provided in the lower surface of the terminal box 4 that covers the top of the tank heat radiating section 2. In addition, a hand hole is provided at the top of the terminal box 4 for connection work and maintenance inspection inside the terminal box, and a propeller fan 10 is attached to the hand hole cover 5, and a ventilation port 9 with a drip-proof cover is provided above the hand hole. It is a provision.

このようにすれば、プロペラファン１０の作用により図
の矢印で示すように端子箱４の下面部の通風口８がら外
部空気が吸い込まれ、内部の暖まった空気は上部の通風
口９から排出されるので、ブッシング乙の放熱を促進す
ることができる。また、この換気作用は通風口８の下方
にある放熱部２に対しては、放熱面に沿った対流による
上昇気流を助長するように働くので、放熱部２の冷却効
果が向上し、特に高温部である放熱部２の上端に近い部
分の放熱量を増大させるのに有効である。In this way, by the action of the propeller fan 10, external air is sucked in through the ventilation opening 8 on the bottom of the terminal box 4 as shown by the arrow in the figure, and the warm air inside is exhausted through the ventilation opening 9 on the top. Therefore, heat dissipation from the bushing B can be promoted. In addition, this ventilation action works on the heat dissipation section 2 located below the ventilation opening 8 so as to promote upward airflow due to convection along the heat dissipation surface, so the cooling effect of the heat dissipation section 2 is improved, especially at high temperatures. This is effective in increasing the amount of heat dissipated near the upper end of the heat dissipating section 2.

本発明の他の実施例を第４図に示す。本実施例は第２図
の従来例と同様にタンク放熱部２の直下に送風機７を設
置した強制風冷式の端子箱付油入電気機器に適用したも
ので、タンク放熱部２の上を覆う端子箱４の下面部と端
子箱４の上部とにそれぞれ通風口８，９を設け、送風機
７を端子箱４の換気用送風手段に兼用している。送風機
７はプロペラファン・シロッコファン・慣流７アンのい
ずれでもよく、さらにはこれらの組合せでもよいＱすな
わち、送風機７により吹き上げられた風は矢印で示すよ
うに放熱部２の波形リプの間を通過した後、その一部は
放熱部２の上方にある通風口８から端子箱４内に入って
ブッシング６の周辺を流れ、最後に端子箱上部の防滴カ
バー付通風口９から排出される。Another embodiment of the invention is shown in FIG. This embodiment is applied to a forced-air-cooled oil-filled electrical equipment with a terminal box in which the blower 7 is installed directly below the tank heat radiating section 2, similar to the conventional example shown in FIG. Ventilation holes 8 and 9 are provided on the lower surface of the covering terminal box 4 and on the upper part of the terminal box 4, respectively, and the blower 7 is also used as an air blowing means for ventilating the terminal box 4. The blower 7 may be a propeller fan, a sirocco fan, an inertia fan, or even a combination of these. After passing through, a part of it enters the terminal box 4 through the ventilation hole 8 above the heat dissipation section 2, flows around the bushing 6, and is finally discharged from the ventilation hole 9 with a drip-proof cover at the top of the terminal box. .

したがって、従来のように送風機ｌからの冷却風が端子
箱４で妨げられることなく、放熱部２の波形リプの間を
風が流れやすくなり、高温部である放熱部２の上端に近
い部分の放熱量が増大して冷却効果を高めるとともに、
端子箱４内も換気が促進されることにより有効に冷却さ
れる。Therefore, the cooling air from the blower l is not obstructed by the terminal box 4 as in the conventional case, and the air flows easily between the waveform lips of the heat dissipation section 2. In addition to increasing the amount of heat dissipation and enhancing the cooling effect,
The inside of the terminal box 4 is also effectively cooled by promoting ventilation.

上記実施例中のプロペラファｙ１０や送風機７の電源は
機器の負荷側からとっても別電源からとつてもよく、さ
らにはＦｅＥＩｉ２などを用いた熱発電素子により電力
を供給してもよい。The power supply for the propeller fan y10 and the blower 7 in the above embodiments may be obtained from the load side of the equipment or from a separate power supply, and furthermore, the power may be supplied by a thermoelectric generating element using FeEIi2 or the like.

また、機器の負荷電流や温度を検出しである程度以上の
高負荷時または高温時にのみこれら送風手段を作動させ
、それ以外の時は自然対流に依存膜することによって冷
却効果をさらに高めることも可能である。以上の実施例
に↓れば、端子箱内が冷却されるためブッシングの電流
容量が少なくて済み、機器の小形軽量化および原価低減
が可能となる。It is also possible to further enhance the cooling effect by detecting the load current and temperature of the equipment and activating these air blowing means only when the load is above a certain level or when the temperature is high, and relying on natural convection at other times. It is. If the above embodiments are followed, the inside of the terminal box is cooled, so the current capacity of the bushing can be reduced, making it possible to reduce the size and weight of the equipment and reduce the cost.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、タンク放熱部の上方に設げられた端子
箱の上面部と下面部に通風口を設け、タンク放熱部と端
子箱内に強制通風するよう構成したのでタンク放熱部の
冷却効果が向上し、特にブッシングの放熱も促進される
ため温度上昇が少なくブッシングとタンクの間に介装す
るシール材の熱劣化を防止でき、信頼性の高い端子箱付
油入電気根器を得ることができる。According to the present invention, ventilation holes are provided on the upper and lower surfaces of the terminal box provided above the tank heat radiating section, and the structure is configured to forcefully ventilate the tank heat radiating section and the terminal box, thereby cooling the tank heat radiating section. The effectiveness is improved, and in particular heat dissipation from the bushing is promoted, so the temperature rise is small and thermal deterioration of the sealing material interposed between the bushing and the tank can be prevented, resulting in a highly reliable oil-filled electric root unit with terminal box. be able to.

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

第１図は従来の自冷式の端子箱付油入電気機器を示す図
で、（ａ）は正面図、（ｂ）は一部切欠いた側面図１、
第２図は従来の強制風冷式の端子箱付油入電気様器を示
す図で、（ａ）は正面図、（ｂ）は一部切欠いた側面図
、第３図は本発明の一実施例図で、（ａ）は平面図、（
ｂ）は一部切断した正面図、（ｃ）はそのＡ視矢方向か
ら見た要部の平面図、第４図は本発明の他の実施例図で
、（ａ）は一部切断した正面図、（’ｂ）は一部切断し
た側面図である。 １：タンク、２：タンク放熱部、６：・ブッシング、４
：端子箱、８．９二通風口、７．１０：送（房 図 （ＩｎFigure 1 shows a conventional self-cooling type oil-filled electrical equipment with a terminal box, in which (a) is a front view, (b) is a partially cutaway side view,
Figure 2 is a diagram showing a conventional forced air cooling type oil-filled electrical converter with a terminal box, (a) is a front view, (b) is a side view with a part cut away, and Figure 3 is a diagram showing one example of the present invention. In the example diagrams, (a) is a plan view, (
b) is a partially cutaway front view, (c) is a plan view of the main part seen from the direction of arrow A, and FIG. 4 is a diagram of another embodiment of the present invention, and (a) is a partially cutaway view. A front view, and ('b) a partially cut side view. 1: Tank, 2: Tank heat dissipation section, 6: Bushing, 4
:Terminal box, 8.9 Two ventilation openings, 7.10: Feed (In

Claims (1)

【特許請求の範囲】[Claims] 電気機器中身と絶縁油を収納し側面に放熱部を有するタ
ンクの上方に端子箱を設けた油入電気機器において、タ
ンク放熱部の上を覆う端子箱の下面部と端子箱の上部と
に通風口を設け、前記通風口を経てタンク放熱部と端子
箱内部に冷却風を流通させる送風手段を設けたことを特
徴とする端子箱付油入電気機器。In oil-filled electrical equipment in which a terminal box is installed above a tank that houses the contents of the electrical equipment and insulating oil and has a heat radiating section on the side, ventilation is provided to the bottom surface of the terminal box that covers the top of the tank's heat radiating section and the top of the terminal box. 1. An oil-filled electrical device with a terminal box, characterized in that a vent is provided and a blowing means is provided for circulating cooling air through the ventilation port into the tank heat radiating section and the inside of the terminal box.