JPH0250407A - Stationary induction electric apparatus - Google Patents

Abstract

PURPOSE:To get an easy transportation and to increase a sound insulating effect by installing, as a sound arrester of a stationary induction electric apparatus, sound insulating plates between reinforcing beams on side plates of a tank with elastic support fittings. CONSTITUTION:The plural number of projecting reinforcing beams 5 are installed at regular intervals on side faces of a tank 4. At the same time, sound insulating plated 6 are installed across the reinforcing beams so that they cover the external faces of side plated 4A of the tank, keeping the height of the beam. The sound insulating plates are installed with elastic support fittings which are fixed on the reinforcing beams on one end to cover the tank divided by the reinforcing beams. With variations of the rigidity, the support span length and the number of the support fittings according to the weight of the sound insulating plate, the vibration of the sound insulating plate support system is decreased. Also, by controlling the vibration by increasing the area of the tank that the sound insulating plate does not cover and the thickness of the side plate of the tank at the bottom, the noise of a transformer can be reduced. By this method, it is easy to assemble and transport the apparatus and also, this devise is helpful to increase a sound insulating effect.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to stationary induction electric appliances such as transformers and accelerators, and particularly relates to a soundproofing device for reducing noise emitted from the equipment body. .

(Conventional technology) In recent years, due to construction site constraints, the number of substations being constructed near urban areas has increased, and it is necessary to reduce the noise generated from stationary induction electrical equipment such as transformers and accelerators installed there. There is a growing need to protect the environment. Vibrations generated from the core or coil that constitutes the main body of a stationary induction electric appliance are transmitted to the tank that houses the core and coil, and are dissipated into the atmosphere as noise from the surface of this tank.

For this reason, as a soundproofing device for such stationary induction electric appliances, the tank of the stationary induction electric appliance is generally covered with a soundproof tank made of iron plate that is installed independently on the foundation to reduce noise, and sound absorbing material is attached to the inside of the soundproof tank. , the structure is designed to reduce noise by absorbing the vibration noise generated from the main body of the device.

(Problem to be solved by the invention) This soundproof structure has a double tank structure because the soundproof tank is placed separately outside the tank of the stationary induction electric device, which increases the installation space and increases the on-site installation time, assembly, transportation costs, etc. There was a drawback that caused

In addition, as shown in Fig. 3, the tank 4 of the oil-immersed transformer has an iron core 1.
, which houses the contents of a transformer consisting of a coil 2 together with insulating oil 3, and is constructed in a box-shape from a thin iron plate. In addition, a plurality of reinforcing beams 5 are attached at intervals around the outer circumference of the tank 4 to withstand the vacuum generated when insulating oil 3 is poured into the tank 4, and the side plate of the tank 4 is made of a thin iron plate. 4A is reinforced.

Iron core 1 that occurs during operation in a transformer with such a configuration
The magnetostrictive phenomenon or the vibration of the coil 2 is transmitted through the insulating oil 3 and the bottom of the tank 4, and the side plate 4A of the tank 4 is caused by the dotted line "I".
+ "2 + "3, it vibrates and becomes noise and is dissipated into the air. Here, the tank side plate 4A is formed of a thin iron plate and has low rigidity.

4B and 4C have the largest vibration, and this side plate 4A is the main source of noise, but the vibration of the highly rigid reinforcement beam 5 portion is small and there is almost no radiation from this portion.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks, reduce the installation space, facilitate assembly and transportation, and provide a static induction appliance with greater soundproofing effect.

[Structure of the Invention] (Means and Effects for Solving the Problems) In order to achieve the above-mentioned objects, the present invention accommodates a main body of equipment consisting of an iron core and a coil in a tank, and provides space on the lateral outer surface of the tank. At the same time, install a plurality of reinforcing beams between the reinforcing beams, and install a sound plate between the reinforcing beams using a plurality of supporting metal fittings with one end fixed to the reinforcing beam. The vibration of the sound plate support system is reduced by covering it with a soundproof plate and changing the rigidity, support span length, and number of the support fittings as appropriate for the mass of the soundproof plate. and,
This is characterized by reducing the noise of the transformer by increasing the thickness of the bottom tank side plate and suppressing vibrations.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the present invention includes a tank 4 in which a main body of equipment consisting of an iron core case 1 and a coil 2 is placed, and a reinforcing beam 5 having an outwardly protruding shape on its lateral outer surface. At the same time, a plurality of sound plates 6 are arranged to span between the reinforcing beams 5 and cover the outer surface of the tank side plate 4A with a gap equal to the beam height. The sound damping plate 6 is supported by a supporting metal fitting 7 formed of a thin iron plate that is fixed to the reinforcing beam 5 at one end and protrudes so as to be supported in a cantilevered manner.
Supported by

Here, as shown in FIG. 2, a soundproof plate 6 of quality ff1W is used.
When the bending rigidity is El and the supporting span is supported by 7N feldspar supporting metal fittings, the vibration angular frequency is ω. Reinforcement beam 5 vibrating at
The vibration transmission rate τ from the sound plate 6 to the sound plate 6 is determined by equation (1).

Therefore, the vibration reduction of the soundproof plate support system is determined by the rigidity El of the support fitting 7 relative to the mass of the soundproof plate 6, the support span length 1, and the relationship between the noise reduction level ΔSPL and the vibration transmissibility τ, which is expressed by equation (2). Desired.

In Niko, if the vibration transmissibility τ is 0.3, the noise reduction level is approximately 10 phon. On the other hand, since various parts such as the bushing 10 are arranged on the tank cover 4B and the tank bottom plate 4C and are in contact with the base surface 11, it is impossible to attach the sound damping plate to these parts. Therefore, it is not possible to achieve a sufficient noise reduction effect by simply attaching the sound plate 6 to the tank side plate 4A.

Therefore, in the present invention, by increasing the thickness T of the tank cover 4B and the tank bottom plate 4C, to which it is difficult to attach the sound damping plate 6, the vibration level is lowered, and the noise level in this area is reduced.

Plate thickness T and noise reduction level ΔS when side plate dimensions are the same
The relationship with PL is determined by equation (3).

△5PL-601og---(3)T.

Here, if the plate thickness T is increased by 1.5 times, the noise reduction level will be approximately 10 phon.

In this way, the transformer tank side plate 4A is equipped with a sound damping plate 6 that sufficiently suppresses vibration, and the thickness of the tank cover 4B and tank bottom plate 40 is 1.5 to 2 times or more than the thickness of the side plate 4A. By increasing the size of the transformer, it is possible to reduce the vibration level of the tank cover 4B and the tank bottom plate 4C, where it is difficult to install a sound isolation plate, and it is possible to reduce the noise of the entire transformer by about 10 phon without using a sound isolation tank. Become. Further, since the sound damping plate 6 is attached close to the surface of the reinforcing beam 5, the external dimensions are reduced, a soundproof tank is not required, and the installation space can be reduced. And the sound plate 6
Most of them can be transported while assembled at the factory, which shortens the installation period and reduces transportation costs.Since the installation area of the soundproof plate 6 can be limited depending on the amount of noise reduction, material costs and assembly costs are reduced, making it economical. become a target. Furthermore, since the sound damping plate 6 is only fixed by partially tightening the fixing bolts, noise reduction control is easy.
In addition, since the elastic sealing material, which is weak in strength, is covered with the edge of the soundproof plate, it has sufficient damage prevention and weather resistance, and is excellent in practicality.

[Effects of the Invention] As described above, according to the present invention, in a stationary induction electric appliance in which the contents of the device consisting of a coil are housed in a tank and a plurality of reinforcing beams are attached at intervals to the tank side plate, the tank A sound plate is attached between the reinforcing beams of the side plate using elastic support metal fittings, and the tank side plates separated by the reinforcement beams are covered with the sound plate with a gap between them, and the thickness of the tank cover and tank bottom plate is adjusted to the same value as that of the tank side plate. Since the thickness is 1.5 times or more than the plate thickness, it is possible to reduce the installation space, make assembly and transportation easier, and obtain stationary induction and electric appliances with greater soundproofing effects.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view showing an embodiment of the present invention, Fig. 2 is an enlarged view of main parts showing how the sound plate is installed in the present invention, and Fig. 3 shows a general stationary induction electric appliance. It is a schematic sectional view. 1...-iron core, 2... coil, 3... insulating oil, 4...
... Tank, 4A ... Tank side plate, 4B ... Tank cover 4C ... Tank bottom plate, 5 ... Reinforcement beam, 6
...Music plate, 7...Elastic support fitting. Figure 1 Applicant's agent Patent attorney Takehiko Suzue Figure 2

Claims (1)

[Claims] In a stationary induction electric appliance in which the equipment contents consisting of an iron core and a coil are housed in a tank, and a plurality of reinforcing beams are attached at intervals to the side plate of the tank, a sound damping plate is elastically supported between the reinforcing beams on the side plate of the tank. The tank side plates, which are attached with metal fittings and separated by reinforcing beams, are covered with soundproof plates with gaps between them, and the thickness of the tank cover and tank bottom plate is at least 1.5 times the thickness of the tank side plates. Characteristic stationary induction appliances.