JP2006166643A - Cooling apparatus of transformer board - Google Patents

Cooling apparatus of transformer board Download PDF

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Publication number
JP2006166643A
JP2006166643A JP2004356138A JP2004356138A JP2006166643A JP 2006166643 A JP2006166643 A JP 2006166643A JP 2004356138 A JP2004356138 A JP 2004356138A JP 2004356138 A JP2004356138 A JP 2004356138A JP 2006166643 A JP2006166643 A JP 2006166643A
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Prior art keywords
transformer
panel
floor
duct
floor plate
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JP2004356138A
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JP4449726B2 (en
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Hideaki Shizu
秀明 志津
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Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
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Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a means to efficiently cool a transformer only by an exhaust fan and an air-flow route with a blower fan and a noise suppressing duct under a floor not required. <P>SOLUTION: In the cooling system, a duct is provided which connects an air inlet to space under the floor of a board, and an opening is provided at a flooring of the board just below the transformer. Fresh air is caused to flow up to the duct, the space under the floor, and the opening of the flooring, from the air inlet, by which the air becomes wind, and it is blown into from an area just below the transformer, by which waste heat of the transformer is removed and it is exhausted from the exhaust fan at a ceiling. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、盤内に格納された半導体応用装置の入力側に設置される変圧器の冷却装置に関する。   The present invention relates to a transformer cooling device installed on the input side of a semiconductor application device stored in a panel.

高圧インバータ装置や半導体応用装置など、高電圧を入力する装置では、高圧側に変圧器を接続し、この変圧器の低圧側に半導体素子を有する変換器が接続され、これらは盤内に格納されて設置される。   In devices that input high voltage, such as high-voltage inverter devices and semiconductor application devices, a transformer is connected to the high-voltage side, and a converter having a semiconductor element is connected to the low-voltage side of this transformer, and these are stored in the panel. Installed.

当該の変圧器は冷却する必要があるが、盤内に格納するものでは、自冷式と風冷式が一般的である。前者は自然に空気が循環して冷却し、後者では盤内にファンを取り付けて強制的に風を当てて冷却する。近年では変圧器の大容量化に対応するため、冷却効果の高い風冷式が主流になりつつある。   Although the transformer needs to be cooled, the self-cooling type and the air-cooling type are generally used for storing in the panel. In the former, air naturally circulates and cools, and in the latter, a fan is installed in the panel and forced to blow and cool. In recent years, in order to cope with an increase in capacity of a transformer, an air-cooled type having a high cooling effect is becoming mainstream.

風冷式としては、特許文献１のものが知られている。この文献には、床下部分に送風ファンを取り付けるか、あるいは天井部に排気ファンを取り付け、収納機器の冷却を図る電気器収納盤が記載されている。
特開平９−８４２２５号公報 As an air cooling type, the thing of patent document 1 is known. This document describes an electric appliance storage panel in which a blower fan is attached to a lower part of the floor or an exhaust fan is attached to a ceiling portion to cool the storage device.
JP-A-9-84225

特許文献１で示すように、床下部分に送風ファンあるいは消音ダクトを設置する場合、変圧器を設置する床面が高くなる。このため、盤内の変圧器格納空間が減少し、冷却効率が悪くなる。また、床面の強度を確保する必要があるため、盤構造や部材のコストが増大する。さらに、盤の重心が上方に移動するため、耐震性が低下する。   As shown in Patent Document 1, when a blower fan or a muffler duct is installed in the lower part of the floor, the floor surface on which the transformer is installed becomes higher. For this reason, the transformer storage space in the panel is reduced, and the cooling efficiency is deteriorated. Moreover, since it is necessary to ensure the strength of the floor surface, the cost of the panel structure and members increases. Furthermore, since the center of gravity of the board moves upward, the earthquake resistance decreases.

また、送風ファンを変圧器の床下部に配設した場合には、床下部分から保守を行わなければならず、作業し難く保守性が劣る問題を有している。   In addition, when the blower fan is disposed in the lower part of the transformer, maintenance must be performed from the lower part of the transformer, which causes a problem that the work is difficult and the maintainability is inferior.

本発明の目的は、床下部の送風ファンおよび消音ダクトを不要とし、排気ファンと風流経路のみで効率的に変圧器の冷却を行う手段を提供することにある。   An object of the present invention is to provide means for efficiently cooling a transformer by using only an exhaust fan and an air flow path, without requiring a blower fan and a muffler duct at the bottom of the floor.

本発明の第一は、変圧器を収納した盤の天井に排気ファンを設け、かつ盤の扉下部に吸気口を設け、この扉下部にある吸気口から盤内に外気を取り入れ、盤内の変圧器周辺の排熱を含んだ空気を盤天井の排気ファンで外部に放出する変圧器盤において、前記吸気口と盤の床下空間とをつなぐダクトを設け、変圧器設置下部の盤の床板には開口部を開け、外気を吸気口からダクト，盤の床下空間および床板開口部を通して変圧器下部から上面方向に流通するよう構成したことを特徴としたものである。   In the first aspect of the present invention, an exhaust fan is provided on the ceiling of the board containing the transformer, and an air inlet is provided at the lower part of the door of the board. Outside air is taken into the board from the air inlet at the lower part of the door, In a transformer panel that discharges air including waste heat around the transformer to the outside with an exhaust fan on the ceiling of the panel, a duct that connects the inlet and the space under the floor of the panel is provided, and the floor plate of the panel at the bottom of the transformer installation is provided. Is characterized in that the opening is opened and the outside air is circulated from the lower part of the transformer to the upper surface through the duct, the space under the floor of the panel, and the floor plate opening.

本発明の第二は、前記床板にガイドを設け、このガイドを介して床板開口部から吹き上げる風を変圧器方向に誘導するよう構成したことを特徴としたものである。   According to a second aspect of the present invention, a guide is provided on the floor board, and the wind blown from the floor board opening is guided through the guide in the direction of the transformer.

本発明の第三は、前記盤の床下空間は、前記変圧器を載置する床板と、この床板を支える本体枠底枠との間隙であることを特徴としたものである。   A third aspect of the present invention is characterized in that the under-floor space of the panel is a gap between a floor plate on which the transformer is placed and a main body frame bottom frame that supports the floor plate.

本発明の第四は、前記盤の床下空間は、前記変圧器を載置する床板と、この床板を支える本体枠底枠および、この本体枠底枠を支承する台枠との間隙であることを特徴としたものである。   According to a fourth aspect of the present invention, the underfloor space of the panel is a gap between a floor plate on which the transformer is placed, a body frame bottom frame that supports the floor plate, and a base frame that supports the body frame bottom frame. It is characterized by.

本発明の第五は、前記ダクトに分岐ダクトを形成し、この分岐ダクト開口部からの外気を前記変圧器に吹き当てるよう構成したことを特徴としたものである。   A fifth aspect of the present invention is characterized in that a branch duct is formed in the duct, and outside air from the opening of the branch duct is blown to the transformer.

本発明の第六は、前記排気ファンの盤下部にフードを設けたことを特徴としたものである。   A sixth aspect of the present invention is characterized in that a hood is provided at a lower part of the exhaust fan panel.

本発明の第七は、前記フードに切り起し部を設けたことを特徴としたものである。   A seventh aspect of the present invention is characterized in that a cut and raised portion is provided in the hood.

以上のとおり、本発明によれば、風冷式であるにもかかわらず、変圧器の床下には消音ダクトやファンは不要となり、床面は低くなる。このため、盤内の変圧器格納空間は十分確保され、冷却効率は向上する。また、床面は補強が不要となり、経済的にも有利となる。また、盤の重心も低くなるので、耐震性も向上する。さらに、盤の床下からのファンの保守が不要となり、保守性が向上する。   As described above, according to the present invention, although it is air-cooled, a silencer duct and a fan are unnecessary under the floor of the transformer, and the floor surface is lowered. For this reason, the transformer storage space in the panel is sufficiently secured, and the cooling efficiency is improved. Further, the floor surface does not need reinforcement, which is economically advantageous. In addition, the center of gravity of the panel is lowered, so the earthquake resistance is improved. Furthermore, maintenance of the fan from the bottom of the panel becomes unnecessary, and maintainability is improved.

図１は本発明における変圧器盤冷却装置の構成図である。同図において、１は盤を構成するための本体枠，２は下部に吸気口２aを有する扉で本体枠１に蝶番等を介して開閉自在に取り付けられる。５は台枠，４は本体枠１の底枠で、冷却風の流通路となる空間４aを形成している。３は底枠４の上面に配設される床板で開口部３aを有している。６はコンクリート等よりなる基礎部，７はダクトで、このダクトは扉２に設けられた吸気口２aと対向する位置の本体枠１に設けられ、吸い込まれた空気が底枠４の空間４aに導かれるように構成されている。10は床板３上に載置された変圧器，11は排気ファンで本体枠１の天井に取り付けられる。上記のように構成された変圧器盤は、盤本体前面の扉２の下部にある吸気口2aから外気を盤内に取り入れ、変圧器10の周辺の排熱を含んだ空気を盤天井の排気ファン11で外部に放出する構造は従来と同様である。   FIG. 1 is a block diagram of a transformer panel cooling device according to the present invention. In the figure, 1 is a main body frame for constituting a board, and 2 is a door having an air inlet 2a in the lower part, and is attached to the main body frame 1 through a hinge or the like so as to be opened and closed. Reference numeral 5 denotes a frame, and 4 denotes a bottom frame of the main body frame 1, which forms a space 4 a serving as a cooling air flow path. 3 is a floor plate disposed on the upper surface of the bottom frame 4 and has an opening 3a. Reference numeral 6 denotes a base portion made of concrete or the like, and 7 denotes a duct. This duct is provided in the main body frame 1 at a position facing the air inlet 2 a provided in the door 2, and the sucked air enters the space 4 a of the bottom frame 4. It is configured to be guided. Reference numeral 10 denotes a transformer placed on the floor plate 3, and 11 denotes an exhaust fan which is attached to the ceiling of the main body frame 1. The transformer panel configured as described above takes outside air into the panel from the inlet 2a at the bottom of the door 2 on the front of the panel body, and exhausts the air including the exhaust heat around the transformer 10 to the exhaust of the panel ceiling. The structure for discharging to the outside by the fan 11 is the same as the conventional structure.

本発明においては、吸気口2aの盤内側にダクト７を設け、床板３と本体枠底枠４との空間４aおよび床板開口部3aを変圧器直下への風流経路として確保したものである。吸気口2aから取り入れた外気はダクト７，空間４a，および床板開口部3aを通ることにより流速を増し、風となって変圧器の直下から側面に吹き当たり、排熱を奪って天井の排気ファンから排出する。したがって、この実施例によれば、盤容量、特に高さ寸法を増やすことなく、有効なる冷却が可能となると共に、メンテナンスが簡単となるものである。   In the present invention, the duct 7 is provided inside the panel of the air inlet 2a, and the space 4a between the floor plate 3 and the main body frame bottom frame 4 and the floor plate opening 3a are secured as a wind flow path directly under the transformer. The outside air taken in from the air inlet 2a increases the flow velocity by passing through the duct 7, the space 4a, and the floor plate opening 3a, blows to the side from the bottom of the transformer and takes away exhaust heat, and exhausts the ceiling. To discharge from. Therefore, according to this embodiment, effective cooling is possible without increasing the panel capacity, particularly the height dimension, and maintenance is simplified.

図２は本発明の第二の実施例を示した部分図である。図１の構成に加えて、床板３に傾斜部を有したガイド８（８a，８b）を設け、開口部３aを通過した冷却風を変圧器側に案内するよう構成したものである。吸気口2aから取り入れた外気はダクト７，床板３と本体枠底枠４との空間４a，床板開口部3aを通り、変圧器の直下から風となって吹き上げる際、ガイド８によって絞り込まれて強く変圧器に当たるよう誘導される。これにより、効率的に排熱を奪って排気ファンから排出する。したがって、この実施例によれば、図１で示す第１の実施例と同様の効果を有すると共に、さらに効率的な冷却効果を有するものである。   FIG. 2 is a partial view showing a second embodiment of the present invention. In addition to the configuration of FIG. 1, the floor plate 3 is provided with guides 8 (8a, 8b) having inclined portions, and the cooling air that has passed through the opening 3a is guided to the transformer side. The outside air taken in from the air inlet 2a passes through the duct 7, the space 4a between the floor plate 3 and the main body frame bottom frame 4, and the floor plate opening 3a, and is strongly squeezed by the guide 8 when it is blown up as a wind from directly below the transformer. Induced to hit the transformer. As a result, the exhaust heat is efficiently taken and discharged from the exhaust fan. Therefore, according to this embodiment, the same effect as that of the first embodiment shown in FIG. 1 is obtained and a more efficient cooling effect is obtained.

図３は本発明の第三の実施例を示した部分図である。この実施例は、本体枠の底枠４の下部に開口部4bを、また、台枠５の上面側に台枠面開口部5aを設けたものである。このように構成したことによって、吸気口2a，ダクト７から取り入れた外気は、床板３と本体枠底枠４との空間４aの流路と、台枠５と基礎部６との空間を通って台枠面開口部5a，本体枠底枠開口部4b，床板開口部3aとを通り抜ける流路の２流路となる。このため大容量の流路が形成されることにより、ガイド８の絞込み抵抗があるにもかかわらず、外気を十分取り込むことができ、強力に排熱を奪って天井の排気ファンから排出できる効果を有する。   FIG. 3 is a partial view showing a third embodiment of the present invention. In this embodiment, an opening 4b is provided in the lower part of the bottom frame 4 of the main body frame, and a frame surface opening 5a is provided on the upper surface side of the frame 5. With this configuration, the outside air taken in from the air inlet 2a and the duct 7 passes through the flow path of the space 4a between the floor plate 3 and the main body frame bottom frame 4, and the space between the frame 5 and the base portion 6. There are two channels, a channel that passes through the frame surface opening 5a, the body frame bottom frame opening 4b, and the floor plate opening 3a. For this reason, by forming a large-capacity flow path, it is possible to sufficiently take in the outside air even though there is a narrowing resistance of the guide 8, and to effectively exhaust heat and exhaust it from the ceiling exhaust fan. Have.

なお、一般に、配電盤や制御盤には台枠５が設けられることが多い。台枠５は盤の本体枠１を基礎に固定するために用いられるが、台枠の四隅が本体枠との接続ボルトや基礎ボルトの位置場所となっている。基礎にケーブル・ピットなどの開口部がないならば、本体枠の底枠とそこに接する台枠面を開口すればダクトとして使用することが可能である。なお、ピットなどの開口部を塞ぐように台枠に板金を設ければ同様の結果を得ることができる。このようにすれば大量の外気をより容易に流すことが可能になる。また、風量が少なければ、床板を設けないで、トランスを底枠面に設置して、台枠、底枠に床板面に設けたような開口部を施しても図１と同様の効果が期待できる。   In general, the frame 5 is often provided on the switchboard or control panel. The underframe 5 is used to fix the main body frame 1 of the board to the foundation, but the four corners of the underframe are the locations of connection bolts and foundation bolts to the main body frame. If there are no openings such as cables and pits in the foundation, it can be used as a duct by opening the bottom frame of the main frame and the frame surface in contact therewith. Note that the same result can be obtained if a metal plate is provided on the frame so as to close an opening such as a pit. This makes it possible to flow a large amount of outside air more easily. Also, if the air volume is small, the same effect as in FIG. 1 can be expected even if the transformer is installed on the bottom frame surface without providing the floor plate, and the opening is provided on the base frame and the bottom frame on the floor plate surface. it can.

図４は本発明の第四の実施例を示す部分図である。図２の構成との相違点は、ダクト７側に設置されたガイド８aの代わりに分岐ダクト7aを設けたことである。このように構成したことにより、吸気口2a，ダクト７から取り入れた外気は、床板３と本体枠底枠４との空間４a，床板開口部3a，ガイド８bによって変圧器に至る流路と、分岐ダクト7aから直接、変圧器に当たる流路で誘導される。２つの流路を設けることにより、空気抵抗を少なくして外気を十分取り込むことができ、強力に排熱を奪って天井の排気ファンから排出する。また、分岐ダクトの開口部を変圧器下部に近接することにより、効率的に風を変圧器に吹き当てることができる。   FIG. 4 is a partial view showing a fourth embodiment of the present invention. 2 is that a branch duct 7a is provided instead of the guide 8a installed on the duct 7 side. With this configuration, the outside air taken in from the air inlet 2a and the duct 7 branches into the space 4a between the floor plate 3 and the main body frame bottom frame 4, the flow path leading to the transformer by the floor plate opening 3a, and the guide 8b. It is guided from the duct 7a directly in the flow path that hits the transformer. By providing the two flow paths, the air resistance can be reduced and the outside air can be taken in sufficiently, and the exhaust heat is exhausted from the ceiling exhaust fan. Further, by bringing the opening of the branch duct close to the lower part of the transformer, it is possible to efficiently blow wind to the transformer.

図５は本発明の第五の実施例を示した構成図である。図１〜図４の何れかの構成に加えて、排気ファン11の下部にフード９を設けている。なお、盤内の上部側に変圧器10以外の発熱体が配設されていて、盤内上部に熱だまりが生じるような場合には、フード９にルーバーのような切り起こし部９aを設けて開口し、流れを乱すことなく熱だまりを解消するようにしてもよい。吸気口2aから取り入れた外気はダクト７，床板３と本体枠底枠４との間隙，床板開口部3aを通って吹き抜ける際、フード９により変圧器側面に沿って流れるよう誘導され、効率よく排熱を奪って天井の排気ファンから排出する。   FIG. 5 is a block diagram showing a fifth embodiment of the present invention. In addition to any of the configurations shown in FIGS. 1 to 4, a hood 9 is provided below the exhaust fan 11. If a heating element other than the transformer 10 is arranged on the upper side of the panel and a heat accumulation occurs in the upper part of the panel, a cut-and-raised part 9a such as a louver is provided on the hood 9. It may be opened to eliminate heat accumulation without disturbing the flow. The outside air taken in from the air inlet 2a is guided to flow along the side of the transformer by the hood 9 when it blows through the duct 7, the gap between the floor board 3 and the body frame bottom frame 4, and the floor board opening 3a, and efficiently exhausts. Remove heat from the ceiling exhaust fan.

上記した各実施例において、変圧器10のメンテナンスは本体枠１から引き出して実施される。その際、ガイド８やダクト７が変圧器引出しの妨げとなるような場合には、それらは取り外し可能状態に配設される。また、ガイドやダクトを絶縁物で構成することにより変圧器に近接して設置することが可能となる。これによって、外気の流れを冷却に有効活用できる。   In each of the above-described embodiments, the maintenance of the transformer 10 is performed by being pulled out from the main body frame 1. At that time, when the guide 8 and the duct 7 hinder the drawing of the transformer, they are arranged in a removable state. Moreover, it becomes possible to install in the vicinity of a transformer by comprising a guide and a duct with an insulator. Thereby, the flow of outside air can be effectively used for cooling.

本発明の実施形態を示す構成図 (第１実施例)。The block diagram which shows embodiment of this invention (1st Example). 本発明の他の実施形態を示す部分図（第２実施例）。The fragmentary view which shows other embodiment of this invention (2nd Example). 本発明の他の実施形態を示す部分図（第３実施例）。The fragmentary view which shows other embodiment of this invention (3rd Example). 本発明の他の実施形態を示す部分図（第４実施例）。The fragmentary figure which shows other embodiment of this invention (4th Example). 本発明の他の実施形態を示す部分図（第５実施例）。The fragmentary figure which shows other embodiment of this invention (5th Example).

符号の説明Explanation of symbols

１… 本体枠
２… 扉
２ａ… 吸気口
３… 床板
３ａ… 床板開口部
４… 本体枠底枠
４ａ… 空間
４ｂ… 本体枠底枠開口部
５… 台枠
５ａ… 台枠面開口部
６… 基礎部
７… ダクト
８ａ… ガイド
８ｂ… ガイド
９… フード
９ａ… 切り起こし部
１０… 変圧器
１１… 排気ファン
DESCRIPTION OF SYMBOLS 1 ... Main body frame 2 ... Door 2a ... Air inlet 3 ... Floor board 3a ... Floor board opening part 4 ... Main body frame bottom frame 4a ... Space 4b ... Main body frame bottom frame opening part 5 ... Underframe 5a ... Underframe surface opening part 6 ... Foundation Part 7 ... Duct 8a ... Guide 8b ... Guide 9 ... Hood 9a ... Cut and raised part 10 ... Transformer 11 ... Exhaust fan

Claims (7)

変圧器を収納した盤の天井に排気ファンを設け、かつ盤の扉下部に吸気口を設け、この扉下部にある吸気口から盤内に外気を取り入れ、盤内の変圧器周辺の排熱を含んだ空気を盤天井の排気ファンで外部に放出する変圧器盤において、前記吸気口と盤の床下空間とをつなぐダクトを設け、変圧器設置下部の盤の床板には開口部を開け、外気を吸気口からダクト，盤の床下空間および床板開口部を通して変圧器下部から上面方向に流通するよう構成したことを特徴とする変圧器盤の冷却装置。   An exhaust fan is provided on the ceiling of the panel containing the transformer, and an air inlet is provided at the bottom of the panel door. Outside air is taken into the panel from the air inlet at the bottom of the door, and the heat around the transformer in the panel is removed. In a transformer panel that discharges the contained air to the outside with an exhaust fan on the ceiling of the panel, a duct is provided to connect the intake port and the space under the floor of the panel. A cooling device for a transformer panel, characterized in that it is circulated from the lower part of the transformer to the upper surface through the duct, the space under the floor of the panel, and the floor plate opening. 前記床板にガイドを設け、このガイドを介して床板開口部から吹き上げる風を変圧器方向に誘導するよう構成したことを特徴とする請求項１記載の変圧器盤の冷却装置。   The transformer for cooling a transformer panel according to claim 1, wherein a guide is provided on the floor plate, and the wind blown from the opening of the floor plate is guided to the transformer direction through the guide. 前記盤の床下空間は、前記変圧器を載置する床板と、この床板を支える本体枠底枠との間隙であることを特徴とする請求項１又は２記載の変圧器盤の冷却装置。   The transformer floor cooling device according to claim 1, wherein the under floor space of the panel is a gap between a floor plate on which the transformer is placed and a main body frame bottom frame that supports the floor plate. 前記盤の床下空間は、前記変圧器を載置する床板と、この床板を支える本体枠底枠及び、この本体枠底枠を支承する台枠との間隙であることを特徴とする請求項１又は２記載の変圧器盤の冷却装置。   2. The underfloor space of the panel is a gap between a floor plate on which the transformer is placed, a main body frame bottom frame that supports the floor plate, and a base frame that supports the main body frame bottom frame. Or the cooling device of the transformer panel of 2. 前記ダクトに分岐ダクトを形成し、この分岐ダクト開口部からの外気を前記変圧器に吹き当てるよう構成したことを特徴とする請求項１乃至４記載の変圧器盤の冷却装置。   5. The cooling device for a transformer panel according to claim 1, wherein a branch duct is formed in the duct, and outside air from the opening of the branch duct is blown to the transformer. 前記排気ファンの盤下部にフードを設けたことを特徴とする請求項１乃至５記載の変圧器盤の冷却装置。   6. The transformer panel cooling apparatus according to claim 1, wherein a hood is provided at a lower part of the panel of the exhaust fan. 前記フードに切り起し部を設けたことを特徴とする請求項６記載の変圧器盤の冷却装置。

7. The transformer panel cooling device according to claim 6, wherein a cut and raised portion is provided in the hood.

JP2004356138A 2004-12-09 2004-12-09 Transformer cooling equipment Expired - Fee Related JP4449726B2 (en)

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JP2008278576A (en) * 2007-04-26 2008-11-13 Toshiba Corp Cooling device of power semiconductor element
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JP2009303354A (en) * 2008-06-12 2009-12-24 Fuji Electric Systems Co Ltd Air cooling apparatus of transformer board
JP2013004598A (en) * 2011-06-14 2013-01-07 Fuji Electric Co Ltd Cooling apparatus for transformer
CN102263385A (en) * 2011-08-11 2011-11-30 浙江安可电气科技有限公司 Ventilation and heat-radiation system of semi-buried box-type transformer substation
JP2013232453A (en) * 2012-04-27 2013-11-14 Nitto Kogyo Co Ltd Seismic control structure of cabinet
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JP2021121015A (en) * 2020-01-30 2021-08-19 株式会社明電舎 Cooling structure of board
JP7131644B2 (en) 2020-01-30 2022-09-06 株式会社明電舎 Panel cooling structure
CN112614655A (en) * 2020-12-03 2021-04-06 安徽晶飞科技有限公司 Cooling device for transformer and working method thereof
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