JPS6023488B2 - stationary induction appliance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stationary induction electric appliance such as a transformer or an actor, and more particularly to a stationary induction electric appliance equipped with a soundproofing device for reducing noise emitted from a tank or a pocket in which a bushing is attached.

In recent years, as urban areas have expanded and houses have been built closer to substations, there has been an increasing demand for lower noise levels in stationary induction electrical appliances such as transformers.

Among stationary induction electric appliances, if we take forced air-cooled transformers as an example,
The noise can be divided into noise caused by magnetostrictive vibration of the iron 0 in the transformer body, and noise generated from auxiliary equipment such as the cooler blower and oil pump. Among these, electromagnetic vibrations due to magnetostriction of the iron core are transmitted to the tank via oil etc., and the vibrations of the tank generate a large amount of noise energy, and various preventive measures have been taken to prevent this. For example, a transformer can be installed in a soundproof building made of concrete or steel plates to insulate and absorb sound, but this method requires an increase in the footing area of the stationary induction transformer, increases production costs, and requires a long construction period. There were various drawbacks such as As a method for easily soundproofing stationary conductors,
It is also possible to use structural members such as reinforcing stays that are fixed to the outside of the tank, install sound insulating plates between these structural members to partially surround the tank, and then place sound absorbing materials inside this structure. , there is a disadvantage that sufficient effects cannot be expected.

When we consider the causes of this, a relatively large proportion of noise is emitted from the top of the tank, pockets where bushings are attached, and various piping and other protruding structures that communicate with the inside of the tank. It is essential to reduce the noise generated from these parts. In particular, in recent static induction electric appliances, the capacity has increased to ultra-high voltages, so the structures protruding from the tank have become longer and the noise generated from these parts has also increased, and along with this, the earthquake resistance of the protruding structures has become A decrease in the amount of carbon dioxide has also become a problem, and various proposals have been made to counter this problem, but none have been sufficiently effective.
The purpose of the stationary induction electric appliance of the present invention is to be able to reduce the noise radiated from the tank and the protruding structure, and to improve the earthquake resistance of the protruding structure. In order to achieve the above object, the present invention provides an auxiliary frame around a protruding structure that communicates with the inside of the tank, and fixes one end of the frame to the tank and the other end to the protruding structure. The frame body is characterized in that a sound insulating plate is attached to at least a portion surrounding the protruding structure. Hereinafter, an explanation will be given using an example in which the static induction electric device of the present invention is applied to a transformer shown in FIGS. 1 to 5. In the transformer, as shown in FIG. 1, a tank 1 is composed of an upper unit 2 and a lower unit 3, which are connected at a flange 4 in this example, and a reinforcing stay 5 is fixed to the outer surface of the tank. A transformer body 6 consisting of an iron core 7, a winding 8, etc. is housed inside the tank 1, and is filled with insulating oil 9, which is an insulating medium, for insulation and cooling. A pocket 10, which is a protruding groove structure that communicates with the inside and projects outward, is provided at the upper part of the tank 1, and a bushing 11 is attached to the pocket 10 to connect it to the winding 8. Bushing 11 installed in the tank
An auxiliary frame body 12 is provided around the pocket 10, as shown in FIGS. 1 to 3.

The auxiliary frame 12 is formed of, for example, a plurality of reinforcing members 13 disposed around the pocket 10 and a connecting member 14 connecting the reinforcing members 13, as shown in FIG. 4, for example. Each reinforcing member 13 of the auxiliary frame 12 has one end fixed to the tank and the pond end side fixed to the pocket 1, thereby increasing the earthquake resistance of the pocket 10 to the auxiliary frame 1.
2 can be improved. This auxiliary frame 12 has
A sound insulating plate 15 similar to that (not shown) attached between the reinforcing stays 5 on the circumferential side of the tank 1 is attached, thereby increasing the sound insulating effect.

The sound insulating plate 15 may be provided so as to cover at least the portion of the auxiliary frame 12 that faces the circumferential surface of the pocket 10, which is a protruding structure, or in addition to this, the upper surface portion of the auxiliary frame 12. By providing it between the connecting member 14 of the auxiliary frame 12 and the auxiliary stay or tank flange 2, which is a structural member on the upper surface of the tank 1, it is possible to further improve sound insulation from the upper part of the transformer tank 1. . As the sound insulating plate 15, a steel plate having a thickness that can prevent the noise from dispersing may be used, but if a further soundproofing effect is expected, a vibration insulating plate formed by bonding a plurality of thin steel plates with adhesive, for example, may be used. A damping steel plate with good characteristics or one shown in FIG. 5 can be used.

The sound insulation plate 15 shown in FIG. 5 includes a thin plate 16 portion with spring characteristics that is fixed to the reinforcing stay 5 and the auxiliary frame 12, a sound insulation plate 17 portion that is joined to this, and a sound insulation slope portion near the boundary between these two parts. The thin plate 16 and the soundproof plate 17 can also be formed using a damping steel plate. When the sound insulating plate 15 shown in FIG. 5 is used in the tank of a transformer, the vibration of the transformer main body 6 is absorbed directly or via insulating oil 9 into the tank 1 provided with the reinforcing stay 5 and the pocket surrounded by the auxiliary frame 12. 10 is transmitted and bending vibration occurs,
Generally, the magnitude of this vibration is greater in areas where there is no reinforcing stay 5 than in areas where there is no reinforcing stay 5 in the tank.

However, most of the noise generated from the portion of the tank where the reinforcing stay 5 is not provided is insulated by the sound insulating plate 15. In other words, since the vibration displacement acts as an excitation force on the end of the soundproof plate 17 through the thin plate 16 having spring characteristics, the weight body 18 attached to the soundproof plate 17 near the boundary between the two acts as an excitation force. The vibrations transmitted from the tank to the sound insulating plate 15 can be significantly reduced, and the generation of noise can be suppressed. In addition, inside the space surrounded by the tank 1 and the sound insulation board 15,
As is well known, sound-absorbing materials can be appropriately arranged to provide a sound-absorbing effect. According to the embodiment of the present invention described above, the earthquake resistance of the pocket 10 and the bushing 11 can be greatly improved due to the reinforcing effect of the auxiliary frame 12 surrounding the pocket 10, and the use of the auxiliary frame 12 makes it possible to greatly improve the earthquake resistance of the pocket 10 and the bushing 11. Since the sound insulating plate 12 can be easily attached to the upper part of the tank, it is possible to effectively reduce the noise radiated from the upper part of the tank such as the pocket 10 part, and by selectively using the sound insulating plate 12, the vibration isolation effect can be further improved. can reduce noise.

In the embodiment of the present invention, the auxiliary frame body 12 is arranged around the pocket 10. can be applied and achieve similar effects.
Furthermore, the auxiliary frame 12 is not limited to the structure of the embodiment shown in FIG. 4, and can be formed as appropriate, taking into consideration the attachment of the sound insulating plate 12 and other structures on the upper part of the tank. If a stationary induction electric device is configured as in the present invention, the earthquake resistance of the protruding structure can be improved by utilizing the auxiliary frame provided around the protruding structure of the tank and the sound insulating plate attached using this frame, and the earthquake resistance of the protruding structure can be improved. And the noise radiated from the protruding structure can be effectively reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical sectional view showing a transformer which is an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is an enlarged view of the main parts of FIG. 1, and FIG. 5 is a perspective view showing an auxiliary frame provided around a structure projecting from the tank, and FIG. 5 is a sectional view showing an example of a sound insulating plate. DESCRIPTION OF SYMBOLS 1... Tank, 6... Transformer body, 9... Insulating oil, 10... Pocket, 11... Bushing, 12...
...Auxiliary frame body, 13...Reinforcement material, 14...Connection material, 15...
・Sound insulation board, 16... Thin plate, 17... Sound insulation board, 18.
...Heavy body. Leopard! Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. A tank in which a stationary induction electric appliance main body is housed and an insulating medium is enclosed, and a protruding structure communicating with the inside of the tank is provided on the outer surface of the tank, and around the protruding structure, A stationary guide characterized in that an auxiliary frame body is provided with one end fixed to the tank and the other end fixed to the protruding structure, and a sound insulating plate is attached to the auxiliary frame body at least in a portion surrounding the protruding structure. Electric appliances. 2. The auxiliary frame includes a plurality of reinforcing members that are distributed around the protruding structure and fix one end to the tank and the other end to the protruding structure, and a connecting member that connects the reinforcing members. A stationary induction electric appliance according to claim 1, characterized in that it is formed by: 3. The tank includes a structural member near the auxiliary frame,
The stationary induction electric appliance according to claim 1, further comprising a sound insulating plate attached between the auxiliary frame and the structural member. 4. Claim 1, wherein the sound insulating plate includes a thin plate having spring characteristics, a sound insulating plate joined to the thin plate, and a weight body provided near the boundary between the thin plate and the sound insulating plate.
The stationary induction electric appliance according to item 1 or 3. 5. The stationary induction electric appliance according to claim 1 or 3, wherein the sound insulating plate is a vibration damping steel plate.