JP3772469B2

JP3772469B2 - Static induction machine

Info

Publication number: JP3772469B2
Application number: JP15420397A
Authority: JP
Inventors: 直人市野
Original assignee: Meidensha Corp
Current assignee: Meidensha Corp
Priority date: 1997-06-12
Filing date: 1997-06-12
Publication date: 2006-05-10
Anticipated expiration: 2017-06-12
Also published as: JPH113825A

Description

【０００１】
【発明の属する技術分野】
本発明は、変圧器やリアクトルなどの静止誘導電器に係り、特に機器本体を絶縁油とともに収納するタンクから発生する騒音を低減する防音装置に関する。
【０００２】
【従来の技術】
運転中、電力用の変圧器やリアクトルなどの静止誘導電器は、タンクに収納されている機器本体の鉄心や巻線が振動を発生する。そしてその振動は、機器本体とタンクとの接触部や、機器本体の絶縁性能を高めるために機器本体とともにタンクに収納されている絶縁油を介してタンクに伝わる。そしてタンクが振動することにより騒音となり、周囲に広がって問題となる。
【０００３】
この場合の騒音対策の一つに、タンク振動そのものを直接に低減する方法として、本体とタンクの接触部を介して伝わる振動が原因となる騒音を低減するため、防振ゴム等を接触部に挿入して伝達する騒音そのものを少なくすることにより低減する方法がある。
【０００４】
一方、絶縁油は圧力が加わっても気体のように体積が変化する物体とは異なり体積の変化しない非圧縮性流体であるため、絶縁油を介して伝わる振動（以下、油中伝播振動と称する）をタンクの剛性だけで振動を押え込むには、その剛性を確保するために非常にコストのかかるタンクが必要となる。
【０００５】
そこで静止誘導電器の油中伝播振動による騒音を低減するために、絶縁油が非圧縮性流体であることを逆に利用して、タンクの板厚を変えて振動し易い部分と、振動し難い部分を設け、油中伝播により振動する絶縁油がタンクの振動し易い部分でのみ振動するようにし、そしてこの振動し易い部分だけに吸音材と防音板を取り付けて、効率的に油中伝播振動による騒音を低減する方法がある。
【０００６】
図４は従来の静止誘導電器の防音構造の正面図、図５は図４のＡ−Ａ断面矢視図で、図４および図５に示すように、従来の静止誘導電器の防音構造は、側板４と天井板５および底板６でタンク３を構成し、その側板４に縦補強部材７を所要の間隔をあけて取り付け、そのタンク３の内部に機器本体１を絶縁油２とともに収納し、側板４の外側にグラスウールなどの吸音材１０を取り付け、さらにその外側に防音板１１を配置して縦補強部材７に取り付ける構造とし、補強部材で区切られた部分の側板４の幅ｂと長さａ、および側板４の厚さｔを設計段階で決定していた。
【０００７】
【発明が解決しようとする課題】
従来の技術で述べた防音構造では、油中伝播振動を低減するため、タンクの側板４の板厚と、補強部材で区切られた部分の側板４の幅ｂと長さａで示される剛性の低い部分の寸法を調整することにより、設計していたが、タンクはその内部で事故が発生した時に生じる内圧に耐えられるような強度を有するように設計する必要があり、補強部材で区切られた部分の側板４の幅ｂと長さａといった寸法は強度の面から制限を受けていた。
【０００８】
また、静止誘導電器から発生する音の大部分は周波数が、５０Ｈｚで運転する場合には１００Ｈｚを主成分に２００Ｈｚ、３００Ｈｚであり、６０Ｈｚで運転する場合には１２０Ｈｚを主成分として２４０Ｈｚ、３６０Ｈｚであり、このような偶数次高調波（第８次高調波以上の周波数はあまり含まれてはいないので除く）の周波数が主となっており、これらを効果的に低減するためには、補強部材で区切られた部分の側板４の幅ｂと長さａ、およびに側板４の板厚ｔで調整するのには限界があるという問題点を有していた。
【０００９】
本発明は、従来の技術の有するこのような問題点に鑑みてなされたもので、タンクの油中伝播振動による騒音を低減し、防音板を取り付ける面積を低減することができる静止誘導電器を提供することを目的とする。
【００１０】
【課題を解決するための手段】
本発明において、上記の課題を解決するための手段は、内側が絶縁油と直接に接触しているタンクの側板または天井または底板の振動しやすい部分（剛性の低い部分）の外側の位置に振動周波数に対応する重量の重りを取り付けてその部分の剛性を調整し、油中伝播振動により振動する絶縁油がこの重りを取り付けた部分に集中するようにして、その振動が集中する部分の外側にのみグラスウールなどの吸音材を取り付け、さらにその外側に防音板を配置して剛性の高い補強部材に防音板を取り付ける。このことにより、油中伝播振動による騒音を低減するようにする。一方、重りを取り付けない側板の部分には吸音材および防音板を取り付けなくてもよいため、吸音材と防音板を取り付ける面積を低減することができる。
【００１１】
【発明の実施の形態】
以下、本発明を図面に示す実施の形態に基づいて説明する。
【００１２】
図１は本発明の第１の実施の形態における静止誘導電器の側面要部断面図で、図１に示すように、タンク３は側板４と天井板５および底板６で構成され、この側板４の外側に図４で示した縦補強部材７を所要の位置に取り付けて側板４の強度を補強し、このタンク３の内部に機器本体１を絶縁油２とともに収納し、側板４の外側の縦補強部材により区分された剛性の低い部分の所要の位置に所要の重量の重り９を取り付け、その重り９を取り付けた側板４の部分の外側にグラスウールなどの吸音材１０を取り付け、さらにその外側に防音板１１を配置して縦補強部材７に取り付けたものである。
【００１３】
なお、前記所要の位置とは、機器本体１の振動が油中伝播により到達する振動量が大きい部分をいい、所要の重量とはその部分に到達する振動周波数に対応する重量をいう。
【００１４】
また、図１では重りは対称の位置に表示してあるが、振動量の大きい部分に取り付けるため、取り付け場所は対称の位置にあるとは限らず、必要な位置に取り付ける。
【００１５】
このように、内側が絶縁油２と直接に接触しているタンク３の側板４の外側の縦補強部材７により区分された振動しやすい部分の所要の位置に、所要の重量の重り９を取り付けて振動しやすいように剛性を調整し、油中伝播振動により振動する絶縁油２が重り９を取り付けた部分の側板４に集中するようにし、その側板４の外側にグラスウールなどの吸音材１０を取り付け、さらにその外側に、防音板１１を縦補強部材７に取り付けることにより、油中伝播振動による騒音を低減するようにしたものである。
【００１６】
また、図２は本発明の第２の実施の形態における静止誘導電器の側面要部断面図で、図２に示すように、タンク３は側板４と天井板５および底板６で構成され、この側板４の外側に縦補強部材７と横補強部材８を所要の位置に取り付けて側板４の強度を補強し、このタンク３の内部に機器本体１を絶縁油２とともに収納し、側板４の外側の縦補強部材７と横補強部材８により区分された部分の所要の位置に、それぞれ静止誘導電器の運転周波数の偶数次高調波の周波数に対する振動周波数（運転周波数が５０Ｈｚの場合には振動周波数は１００Ｈｚ、２００Ｈｚ、３００Ｈｚが主成分であり、運転周波数が６０Ｈｚの場合には振動周波数は１２０Ｈｚ、２４０Ｈｚ、３６０Ｈｚが主成分になる）に対応した所要重量の重り９Ａ，９Ｂおよび９Ｃを取り付け、その重りを取り付けた側板４の縦補強部材７と横補強部材８の部分の外側にグラスウールなどの吸音材１０を取り付け、さらにその外側に防音板１１を縦補強部材７と横補強部材８に取り付けたものである。
【００１７】
なお、前記所要の位置とは、機器本体１の振動が油中伝播により到達する振動量が大きく振動しやすい部分をいう。所要の重量とは振動周波数、振動エネルギー、縦補強部材７と横振動部材８により区分された部分の面積、側板４の板厚などにより異なり、その部分に到達する振動周波数に対応して油中伝播振動が集中する重量である。
【００１８】
図２では、重りは９Ａ，９Ｂおよび９Ｃとして表現したが、３種類とは限らず、それぞれ必要に応じた重量を選択する。また、図２では重りは対称の位置に表示してあるが、振動量の大きい部分に取り付けるため、取り付け場所は対称の位置にあるとは限らず、必要な位置に取り付ける。
【００１９】
このように、内側が絶縁油２と直接に接触している側板４の外側の縦補強部材７と横補強部材８により区分された部分に、それぞれ静止誘導電器の運転周波数の偶数次高調波の周波数に対する振動周波数に対応した所要の重量を取り付け、その側板４に振動を集中するようにするとともに、この振動する側板４の外側にグラスウールなどの吸音材１０を取り付け、さらにその外側に防音板１１を縦補強部材７と横補強部材８に防音板１１を取り付けるようにしたので、油中伝播振動による騒音は低減され、重りを取り付けない側板の部分には吸音材および防音板を取り付けないですむため、吸音材と防音板を取り付ける面積を低減することができる。
【００２０】
また、図３は本発明の第３の実施の形態の側面要部断面図で、図３に示すように側板４と底板５および天井板６からなるタンク３の内部に機器本体１を絶縁油２とともに収納し、天井板５の上側の所要の位置に所要の重量の重り９Ｄを取り付けるとともに、その重り９Ｄを取り付けた天井板５の外側の部分にグラスウールなどの吸音材１０を取り付け、その外側に設けた防音板取付枠１２に防音板１１を取り付けたものである。
【００２１】
このように、内側が絶縁油２と直接に接触している天井板５の上側の所要の位置に重り９Ｄを取り付けることにより天井板５の一部（剛性の低い部分）に油中伝播振動により振動が集中するようにし、その天井板５の外側にグラスウールなどの吸音材１０を取り付け、さらにその外側に設けた防音板取付枠１２に防音板１１を取り付けることにより、油中伝播振動による騒音を低減するようにしたものである。
【００２２】
本発明の第３の実施の形態については、天井板５に重りと吸音材および防音板を取り付けた場合について説明したが、底板６の場合は天井板５の場合とほぼ同様な構成であるので、説明を省略する。
【００２３】
以上、本発明の第１〜第３の実施の形態について説明したが、必要により、これらを組み合わせた構成によっても所要の効果が得られることは勿論である。
【００２４】
【発明の効果】
本発明の静止誘導電器の防音構造は、内側が絶縁油と直接に接触しているタンクの側板などの外側の振動しやすい部分に重りを取り付け、油中伝播振動により振動する絶縁油が重りを取り付けた側板の部分に集中するようにし、その側板の外側にグラスウールなどの吸音材を取り付け、さらにその外側に防音板を取り付けることにより、油中伝播振動による騒音を低減するように構成されているので、次に記載する効果を奏する。
【００２５】
（１）内部圧力に対するタンク強度計算の制約を受けることなく効果的にタンクの油中伝播振動による騒音を低減できる。
【００２６】
（２）タンクに付ける重りの重さを変えることにより、より効果的に騒音を低減できる。
【００２７】
（３）油中伝播振動がタンク側板の一部に集中することから、この集中する部分だけに吸音材と防音板を取り付ければよいので、防音板を付ける面積を低減することができる。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態における静止誘導電器の要部断面図。
【図２】本発明の第２の実施の形態における静止誘導電器の要部断面図。
【図３】本発明の第３の実施の形態における静止誘導電器の要部断面図。
【図４】従来の静止誘導電器の正面図。
【図５】従来の静止誘導電器の要部断面図。
【符号の説明】
１…機器本体
２…絶縁油
３…タンク
５…天井板
６…底板
７…縦補強部材
８…横補強部材
９，９Ａ，９Ｂ，９Ｃ，９Ｄ…重り
１０…吸音材
１１…防音板
１２…防音板取付枠[0001]
BACKGROUND OF THE INVENTION
The present invention relates to static induction appliances such as transformers and reactors, and more particularly to a soundproofing device that reduces noise generated from a tank that houses a device main body together with insulating oil.
[0002]
[Prior art]
During operation, static induction electric appliances such as power transformers and reactors generate vibrations in the iron core and windings of the equipment body housed in the tank. The vibration is transmitted to the tank through the contact portion between the device main body and the tank and the insulating oil stored in the tank together with the device main body in order to improve the insulation performance of the device main body. The tank vibrates and generates noise, which spreads around and becomes a problem.
[0003]
As one of the noise countermeasures in this case, as a method of directly reducing the tank vibration itself, to reduce the noise caused by the vibration transmitted through the contact part between the main body and the tank, a vibration isolating rubber or the like is applied to the contact part. There is a method of reducing noise by reducing the noise itself inserted and transmitted.
[0004]
On the other hand, since the insulating oil is an incompressible fluid that does not change in volume unlike an object that changes in volume even when pressure is applied, vibration transmitted through the insulating oil (hereinafter referred to as propagation vibration in oil). In order to suppress the vibration only by the rigidity of the tank, a very expensive tank is required to secure the rigidity.
[0005]
Therefore, in order to reduce the noise caused by the propagation vibration in the oil of the static induction appliance, the part that is easy to vibrate by changing the thickness of the tank by using the fact that the insulating oil is an incompressible fluid and the vibration is difficult. Providing a part so that the insulating oil that vibrates due to propagation in oil vibrates only in the part where the tank easily vibrates, and a sound absorbing material and a soundproofing plate are attached only to the part that easily vibrates, thereby effectively transmitting the vibration in oil. There is a method to reduce the noise caused by.
[0006]
4 is a front view of a conventional soundproof structure of a static induction electric machine, FIG. 5 is a cross-sectional view taken along the line AA of FIG. 4, and as shown in FIG. 4 and FIG. The side plate 4, the ceiling plate 5, and the bottom plate 6 constitute the tank 3, and the vertical reinforcing member 7 is attached to the side plate 4 at a required interval, and the device main body 1 is stored in the tank 3 together with the insulating oil 2. A sound absorbing material 10 such as glass wool is attached to the outside of the side plate 4, and a soundproof plate 11 is further arranged on the outside of the side plate 4 so as to be attached to the vertical reinforcing member 7. The width b and length of the side plate 4 at the portion delimited by the reinforcing member a and the thickness t of the side plate 4 were determined at the design stage.
[0007]
[Problems to be solved by the invention]
In the soundproof structure described in the prior art, in order to reduce the propagation vibration in oil, the thickness of the side plate 4 of the tank and the rigidity indicated by the width b and the length a of the side plate 4 of the portion delimited by the reinforcing member The tank was designed by adjusting the dimensions of the lower part, but the tank must be designed to have enough strength to withstand the internal pressure generated when an accident occurs inside, and it was separated by a reinforcing member. The dimensions such as the width b and the length a of the side plate 4 of the portion are limited in terms of strength.
[0008]
In addition, most of the sound generated from the static induction machine has a frequency of 200 Hz and 300 Hz with 100 Hz as the main component when operating at 50 Hz, and 240 Hz and 360 Hz with 120 Hz as the main component when operating at 60 Hz. Yes, the frequency of such even-order harmonics (excluding frequencies that are higher than the eighth harmonic is not included) is mainly used, and in order to effectively reduce these, reinforcing members There is a problem in that there is a limit to adjusting the width b and length a of the side plate 4 and the thickness t of the side plate 4 at the portion delimited by.
[0009]
The present invention has been made in view of such problems of the prior art, and provides a static induction electric appliance capable of reducing noise due to propagation vibration in oil in a tank and reducing the area to which a soundproof plate is attached. The purpose is to do.
[0010]
[Means for Solving the Problems]
In the present invention, the means for solving the above-mentioned problem is that the vibration is generated at a position outside the easily oscillating portion (low rigidity portion) of the side plate or ceiling or bottom plate of the tank that is in direct contact with the insulating oil. Install a weight corresponding to the frequency to adjust the rigidity of the part, so that the insulating oil that vibrates due to the propagation vibration in oil concentrates on the part where the weight is attached, and outside the part where the vibration concentrates. A sound-absorbing material such as glass wool is attached, and a sound-insulating plate is arranged on the outside of the sound-absorbing material, and the sound-insulating plate is attached to a highly rigid reinforcing member. As a result, noise caused by propagation vibration in oil is reduced. On the other hand, since it is not necessary to attach the sound absorbing material and the soundproof plate to the portion of the side plate to which the weight is not attached, the area for attaching the sound absorbing material and the soundproof plate can be reduced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on embodiments shown in the drawings.
[0012]
FIG. 1 is a cross-sectional view of a main part of a side surface of a static induction appliance according to a first embodiment of the present invention. As shown in FIG. 1, a tank 3 is composed of a side plate 4, a ceiling plate 5 and a bottom plate 6. 4 is attached to a required position to reinforce the strength of the side plate 4, and the main body 1 is housed in the tank 3 together with the insulating oil 2. A weight 9 having a required weight is attached to a required position of a portion having low rigidity divided by the reinforcing member, and a sound absorbing material 10 such as glass wool is attached to the outside of the portion of the side plate 4 to which the weight 9 is attached. The soundproof plate 11 is disposed and attached to the vertical reinforcing member 7.
[0013]
In addition, the said required position means the part with the large vibration amount which the vibration of the apparatus main body 1 reaches | attains by propagation in oil, and a required weight means the weight corresponding to the vibration frequency which reaches | attains that part.
[0014]
In FIG. 1, the weight is displayed at a symmetric position. However, since the weight is attached to a portion with a large amount of vibration, the attachment location is not necessarily at the symmetric position and is attached at a necessary position.
[0015]
In this way, the weight 9 having the required weight is attached to the required position of the portion easily vibrated divided by the vertical reinforcing member 7 on the outer side of the side plate 4 of the tank 3 that is in direct contact with the insulating oil 2. The insulation oil 2 that vibrates due to the propagation vibration in oil is concentrated on the side plate 4 where the weight 9 is attached, and a sound absorbing material 10 such as glass wool is placed outside the side plate 4. The soundproof plate 11 is attached to the longitudinal reinforcing member 7 on the outside, and noise due to the propagation vibration in oil is reduced.
[0016]
FIG. 2 is a cross-sectional view of the main part of the side of the stationary induction device according to the second embodiment of the present invention. As shown in FIG. 2, the tank 3 includes a side plate 4, a ceiling plate 5, and a bottom plate 6. A vertical reinforcing member 7 and a lateral reinforcing member 8 are attached to the outside of the side plate 4 to reinforce the strength of the side plate 4, and the device body 1 is housed in the tank 3 together with the insulating oil 2. The vibration frequency with respect to the frequency of the even harmonics of the operating frequency of the stationary induction device (when the operating frequency is 50 Hz, the vibration frequency is The main weights are 100 Hz, 200 Hz, and 300 Hz, and when the operation frequency is 60 Hz, the vibration frequencies are 120 Hz, 240 Hz, and 360 Hz. A sound absorbing material 10 such as glass wool is attached to the outside of the longitudinal reinforcing member 7 and the lateral reinforcing member 8 of the side plate 4 to which the weight is attached, and the soundproof plate 11 is attached to the outside of the sound absorbing plate 11 and the lateral reinforcing member. 8 is attached.
[0017]
In addition, the said required position means the part which the vibration amount which the vibration of the apparatus main body 1 reaches | attains by propagation in oil is large, and it vibrates easily. The required weight differs depending on the vibration frequency, vibration energy, the area of the portion divided by the vertical reinforcing member 7 and the transverse vibration member 8, the plate thickness of the side plate 4, etc., and in the oil corresponding to the vibration frequency reaching that portion. This is the weight at which the propagation vibration is concentrated.
[0018]
In FIG. 2, the weights are expressed as 9A, 9B, and 9C. However, the weights are not limited to three types, and weights are selected as necessary. In FIG. 2, the weight is displayed at a symmetric position. However, since the weight is attached to a portion with a large amount of vibration, the attachment location is not necessarily at the symmetric position and is attached at a necessary position.
[0019]
In this way, the even-numbered harmonics of the operating frequency of the stationary induction device are respectively divided into the portions separated by the vertical reinforcing member 7 and the horizontal reinforcing member 8 on the outer side of the side plate 4 that is in direct contact with the insulating oil 2. A required weight corresponding to the vibration frequency with respect to the frequency is attached, the vibration is concentrated on the side plate 4, a sound absorbing material 10 such as glass wool is attached to the outside of the vibrating side plate 4, and the soundproof plate 11 is further outside. Since the soundproofing plate 11 is attached to the vertical reinforcing member 7 and the horizontal reinforcing member 8, the noise due to the propagation vibration in oil is reduced, and it is not necessary to attach the sound absorbing material and the soundproofing plate to the side plate part where the weight is not attached. Therefore, the area for attaching the sound absorbing material and the soundproof plate can be reduced.
[0020]
FIG. 3 is a sectional side view of the main part of the third embodiment of the present invention. As shown in FIG. 3, the device main body 1 is insulated with oil in the tank 3 composed of the side plate 4, the bottom plate 5 and the ceiling plate 6. 2, and a weight 9D having a required weight is attached to a required position on the upper side of the ceiling board 5, and a sound absorbing material 10 such as glass wool is attached to an outer portion of the ceiling board 5 to which the weight 9D is attached. The soundproof plate 11 is attached to the soundproof plate mounting frame 12 provided in the above.
[0021]
In this way, by attaching the weight 9D to the required position on the upper side of the ceiling plate 5 in which the inner side is in direct contact with the insulating oil 2, a part of the ceiling plate 5 (the portion having low rigidity) is subjected to vibration propagation in oil. By attaching the sound absorbing material 10 such as glass wool to the outside of the ceiling plate 5 and attaching the sound insulating plate 11 to the sound insulating plate mounting frame 12 provided outside the ceiling plate 5 so that the vibration is concentrated, the noise caused by the propagation vibration in oil is reduced. It is intended to reduce.
[0022]
The third embodiment of the present invention has been described with respect to the case where a weight, a sound absorbing material, and a soundproof plate are attached to the ceiling plate 5. However, since the bottom plate 6 has a configuration similar to that of the ceiling plate 5. The description is omitted.
[0023]
Although the first to third embodiments of the present invention have been described above, it is needless to say that the necessary effects can be obtained by combining these as necessary.
[0024]
【The invention's effect】
In the soundproof structure of the static induction appliance according to the present invention, a weight is attached to an easily vibrated portion such as a side plate of a tank that is in direct contact with the insulating oil, and the insulating oil that vibrates due to propagation vibration in the oil is weighted. It is configured to concentrate on the attached side plate part, attach a sound absorbing material such as glass wool to the outside of the side plate, and attach a soundproof plate to the outside of the side plate to reduce noise caused by propagation vibration in oil. Therefore, there exists an effect described next.
[0025]
(1) It is possible to effectively reduce the noise due to the propagation vibration in the tank oil without being restricted by the tank strength calculation with respect to the internal pressure.
[0026]
(2) Noise can be reduced more effectively by changing the weight of the weight attached to the tank.
[0027]
(3) Since the propagation vibration in oil concentrates on a part of the tank side plate, it is only necessary to attach the sound absorbing material and the soundproof plate only to the concentrated portion, so that the area for attaching the soundproof plate can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a static induction electric device according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of a main part of a static induction electric device according to a second embodiment of the present invention.
FIG. 3 is a cross-sectional view of a main part of a static induction electric device according to a third embodiment of the present invention.
FIG. 4 is a front view of a conventional static induction electric device.
FIG. 5 is a cross-sectional view of a main part of a conventional static induction electric device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Equipment main body 2 ... Insulating oil 3 ... Tank 5 ... Ceiling board 6 ... Bottom board 7 ... Vertical reinforcement member 8 ... Horizontal reinforcement member 9, 9A, 9B, 9C, 9D ... Weight 10 ... Sound absorption material 11 ... Sound insulation board 12 ... Sound insulation Plate mounting frame

Claims

In a static induction electric appliance in which the equipment body is housed with insulating oil inside a tank consisting of a side plate, ceiling plate, and bottom plate, a vertical reinforcing member is attached to the outside of the side plate of the tank at a required position to reinforce the strength of the side plate. The weight is attached to the required position of the part divided by the vertical reinforcing member on the outside of the side plate of the tank, the sound absorbing material is attached to the outside of the portion of the side plate to which the weight is attached, and the soundproof plate is arranged on the outside And the static induction machine characterized by attaching this soundproof board to the said longitudinal reinforcement member.

In a static induction electric appliance in which the equipment main body is housed with insulating oil inside a tank composed of a side plate, a ceiling plate, and a bottom plate, a vertical reinforcing member and a horizontal reinforcing member are attached to required positions on the outside of the side plate of the tank, and the side plate is The required weight corresponding to the vibration frequency corresponding to the frequency of the even harmonics of the operating frequency of the stationary equipment is provided at the required position of the portion reinforced and separated by the vertical reinforcing member and the horizontal reinforcing member on the outside of the side plate of the tank. A sound absorbing material is attached to the outside of the side plate portion to which the weight is attached, a sound insulating plate is further provided outside the weight, and the sound insulating plate is attached to the vertical reinforcing member and the lateral reinforcing member. Static induction machine.

Attach the weight to the required position on the outside of the ceiling plate or bottom plate, attach the sound absorbing material to the part of the ceiling plate or the part of the bottom plate to which the weight is attached, and attach the sound insulation plate to the sound insulation plate mounting frame provided on the outside The static induction machine according to claim 1 or 2, wherein

In a static induction electric appliance in which equipment body is housed with insulating oil inside a tank composed of side plates, ceiling plates, and bottom plates, a weight is attached to a required position outside the ceiling plate or bottom plate, and the ceiling plate with the weights attached A static induction electric appliance characterized in that a sound absorbing material is attached to the outside of the part or the bottom plate, and a sound insulation plate is attached to a sound insulation plate mounting frame provided on the outside.