JPS58153313A - Low noise stationary induction apparatus - Google Patents

Abstract

PURPOSE:To efficiently reduce vibration with small vibrating force and to sufficiently protect a vibration sensor and a vibrator by mounting the vibration sensor and the vibrator inside a noiseproof wall and providing a controller in the space between the body and the wall. CONSTITUTION:A vibration sensor 10 for detecting the vibration of a noiseproof wall 3 and a vibrator 11 for vibrating the wall 3 are provided inside the wall 3, and a controller 12 of the vibrator 11 is installed in the space 6 between a transformer body 1 and the wall 3. The sensor 10 outputs an electric signal in response to the frequency and phase of the vibration of the wall 3. The controller 12 inputs the output of the sensor 10 to, for example, form a signal of substantially output phase to the phase of the vibration, amplifies the electric power and vibrates the vibrator 11. The vibrator 11 vibrates the wall 3 substantially out of phase to the vibration of the wall 3, thereby suppressing the vibration. Since the wall 3 is formed at both sides of air and is readily vibrated as compared with a container 2 in which insulating oil is filled, it can be efficiently reduced in vibration with small vibrating force. The sensor 10 and the vibrator 11 can completely protect itself against wind and rain.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to stationary induction electric appliances such as transformers and accelerators, and particularly to apparatuses that reduce noise caused by vibration.

In general, stationary induction appliances generate vibrations due to magnetostriction occurring in the components of the magnetic circuit and electric aeL attraction due to leakage magnetic flux. This vibration is transmitted to externally facing structures, such as containers, causing noise. In order to reduce this noise, various measures have been taken in the past, such as reducing the magnetic flux density, installing a special circuit to cancel leakage magnetic flux, or surrounding the entire stationary induction device with a soundproof wall. It's here. However, with these measures, the static induction appliance becomes larger and heavier, the configuration of the static induction appliance becomes more complicated, or the installation area increases, but sufficient soundproofing effects cannot be obtained. There were drawbacks such as the inability to

Therefore, recently, a method of canceling the vibration by applying anti-phase vibration to a vibrating stationary induction appliance container has been studied. A 5Kall sensor and a vibrator are installed, and the vibration detected by the vibration sensor is applied to the container by the vibrator, preferably in an opposite phase to the vibration detected by the vibration sensor, thereby suppressing the vibration of the container. But with this method,
Since the inside of the container is filled with insulating oil, a large excitation force is required to vibrate the walls of the container.In order to obtain a sufficient soundproofing effect, a vibrator with a large k value of ■ must be used, or As a result of the study, it was determined that there was a need to increase the number of machines. Also,
Since the vibrator and vibrator are attached to the outside of the container, their resistance to wind and rain is also a problem.The purpose of the present invention is to eliminate the drawbacks of the prior art described above, and to Efficient vibration reduction, and l! wJ
- To provide a low-noise stationary induction electric appliance that can sufficiently protect the vibration absorber and vibration exciter.

In order to achieve this object, the present invention provides a stationary induction electric appliance in which an iron core and a winding are housed in a container, and a soundproof wall is provided to cover at least the central side of the stationary induction electric appliance main body which is filled with insulating oil. A vibration sensor that detects vibrations of the soundproof wall and a vibrator that vibrates the soundproof wall are installed inside the soundproof wall, and an output of the vibrator is adjusted in accordance with input from the vibration sensor. 0 #!, characterized in that a control device is provided to control vibrations of the soundproof wall to be suppressed. Figure 1 shows an example of a normal transformer with soundproof walls.

The transformer body 1 consists of a 2-yen container containing an iron core and windings, and filled with insulating oil. This transformer body 1 has a soundproof wall 3
is surrounded by. The soundproof wall 3 is generally composed of a side plate 4 made of a steel plate with a thickness of several mm to more than ten mm, and a reinforcing stay 5 made of H-shaped steel or L-shaped steel. Note that the soundproof wall 3 is usually constructed on a foundation different from the transformer main body 1 in order to insulate the vibration system.

In such a transformer with soundproof walls, the iron core is 11RIElI.
is transmitted to the container 2 via the insulating oil, the container 162 vibrates and radiates noise into the space 6 between the transformer body 1 and the soundproof wall 30. Further, the vibration is transmitted to the soundproof wall 3 using the air in the space 6 as a medium, and the soundproof wall 3 vibrates and radiates noise to the outside.

Figures 2 and 3 show the above-mentioned transformer with soundproof walls (towards).
This figure shows the vibration mode of the soundproof wall at point k, and shows the state of the side surface of the soundproofing wall 113 in FIG. 1 viewed from the direction of arrow X.

Figure 2 shows an example of the natural vibration when the side plate of the soundproof wall and the reinforcement stay vibrate together, and Figure 3 shows an example of the natural vibration when the vibration of the reinforcement stay is small and the vibration of the side plate is large. This is an example of a vibrating screen.

Even in such a transformer with a projecting wall and a sound wall, since the soundproof wall itself vibrates due to sound pressure from inside, it is inevitable that the noise of @ degree outside is radiated. However, the important thing to note here is that there is air on both sides of the soundproof wall. Since there is air on both sides of the soundproof wall, it is much easier to excite vibrations than in a container filled with oil, so if you attach a vibrator to the soundproof wall to suppress the vibration, you can efficiently reduce noise. In other words, it is possible to reduce the

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 4 shows an embodiment of the present invention. In this figure, 1 is a transformer body, 2 is its container, 3 is a soundproof wall, 1
0 is a bushing pocket that passes through the soundproof wall 3, 8 is a bushing, and 9 is an oil pipe. In this embodiment, in a transformer with such a soundproof wall, vibration of the soundproof wall 3 is stored inside the soundproof wall 3. A vibration sensor 10 for detecting the
A control device 12 for a vibrator 11 is installed in a space 6 between the soundproof wall 3 and the soundproof wall 3.

The vibration sensor 10 is, for example, an acceleration sensor type that uses a piezo element as an illumination device, and outputs an electric signal corresponding to the frequency, amplitude, and phase of the vibration of the soundproof wall 3.The control device 12 inputs the output of this vibration sensor 10. [For example, the vibration exciter 11 that creates a signal with a phase almost opposite to that of the vibration and amplifies the power to excite the vibration exciter 11 is, for example, in the form of an inertial force exciter, The vibration of the soundproof wall 3 is suppressed by vibrating the soundproofing 113 in substantially the opposite phase to the vibration of the soundproofing 113.

Next, an example of the operation for suppressing vibration will be described with reference to FIG. 5. The vibration of the soundproof wall 3 is detected by the vibration sensor 10. The analog detection time signal detected by the vibration sensor 10 is converted into a digital detection time signal by the analog-to-digital converter 13 of the control 11t12.
This digital detection frequency signal is converted into a digital detection frequency signal by 4. This digital detection frequency signal represents the amplitude and phase of each frequency component of the vibration generated in the soundproof wall 3, so the amplitude of these frequency components is reduced. The arithmetic unit 15 calculates the amplitude and phase amount for each frequency, and sends this as a digital vibration reduction frequency signal to the Fourier inverse transformer 16. The digital vibration reduction frequency signal is sent to the Fourier inverse transformer 1.
6 into a digital vibration reduction time signal, which is further converted into an analog vibration reduction time signal by a digital-to-analog converter 1T, and then amplified by a power amplifier 18 and sent to the vibrator 11. The energizing vibration al 111 generates vibrations that reduce the amplitude of each frequency component of the vibration generated in the soundproof wall 3 by the energization of the amplified analog vibration reduction time signal, and transmits this to the soundproof wall 3. In addition, vibration of the soundproof wall 3 is reduced.

The arithmetic unit 15 adjusts the amplitude and phase of the digital vibration reduction frequency signal so that the vibration of the soundproof wall 3 is always at 1/4% in response to changes in the vibration generated in the soundproof wall 3, that is, the digital detection frequency signal. In addition, the analog-to-digital converter 13 and the digital-to-analog converter 1
7 is controlled by a synchronization signal generated by a synchronization signal generator 19.
Since the vibration frequency of the soundproof wall 3 and the integral multiple of the power supply frequency of the transformer body 1 match, the frequency of the vibration of the soundproof wall 3 is the same as the integral multiple of the power supply frequency of the transformer body 1. . Note that the Fourier transformer 14, the performance X device 15, and the Fourier inverse transformer 11 are composed of, for example, a microcomputer.

As described above, according to this embodiment, since the vibration sensor and the vibration exciter are attached to the soundproof wall, which has air on both sides and is easy to vibrate, it is possible to suppress the pushing motion rather than to vibrate a container filled with insulating oil. The excitation force required for this purpose can be reduced, and noise can be efficiently reduced using a small vibrator or a small number of vibrators. In addition, the vibration sensor and exciter are installed inside the soundproof wall, and the control device is installed in the space between the transformer body and the soundproof wall, so both are completely protected against wind and rain and are stable over a long period of time. It is possible to ensure proper operation. Although there is some sound leakage from the bushing and oil pipe in this embodiment, the main cause of the noise radiated to the outside is the vibration of the soundproof wall, so if this can be suppressed, the noise will be significantly reduced.

FIG. 6 shows another embodiment of the invention. In this embodiment, an eaves-shaped soundproof wall 31 is provided around the circumference 18 of the transformer body 1, and a vibration sensor 10 and a vibrator 11 are installed inside the eave-shaped soundproof wall 3a. A control l111112 is installed in the space between the two. Such a canopy-shaped soundproof wall 3a is a container 2 of the transformer body 1.
This is suitable when the vibration of the ceiling surface is small. The operation for noise prevention is the same as in the previous embodiment. According to this embodiment, since there is no ceiling part on the soundproof wall, there is an advantage that the number of vibration sensors and vibration exciters can be reduced. How to install the shaker is shown below.

In the example shown in FIG. 7, the soundproof wall 3 is composed of a feed plate 4 and a reinforcing stay 5, and the excitation 11111 is attached to the side plate 4. This configuration has the advantage that the excitation force of the vibrator 11 can be small.

In the example of FIG. 8, the configuration of the soundproof wall 3 is l! Although it is the same as the case in FIG. 7, the vibrator 11 is attached to the reinforcing stay. In the example shown in Fig. 7, the excitation force is applied only in a dotted manner, but in the configuration shown in this example, the excitation force is applied linearly due to the rigidity of the reinforcing stay 5. The number of containers can be reduced.

In the example of the ninth factor, the soundproofing 113 is composed of the side plate 4, the reinforcing stay 5, and the beam 20 connecting the reinforcing stay 5, and the vibration exciter 11 is attached to the beam 20. In order to reduce the number of vibration exciters 11, such a configuration is also effective.Which of the three examples above should be used for installing the vibration exciters 11 depends on the structure of the soundproof wall, the vibration mode, etc. Different 0 As shown in Figure 2, the reinforcement stay vibrates together with the side plate [
If the vibration of the reinforcement stay is small and the vibration of the side plate is large, as shown in Figure 3, it is effective to install the vibration exciter on the reinforcement stay. It is effective to attach a castle to the side plate. In addition, in any of the above cases, it is effective to install the vibrator at the antinode of the vibration. In addition, in the above embodiment, the control device was installed in the space between the transformer body and the soundproof wall, but this control device was installed in the space between the transformer body and the soundproof wall, considering the convenience of adjustment. It can also be installed outside 111.

In the above embodiment, the vibration sensor and the vibration exciter were provided in a one-to-one relationship at the same location, so the explanation was given that the vibration force that is in the opposite phase to the vibration detected by the vibration sensor is applied by the vibration exciter. When the vibration sensor and the vibration exciter are installed far apart, or when one vibration sensor is controlled by the input from vibration sensors installed at multiple locations, the output of the vibration sensor is not necessarily the same as the vibration sensor. The detected vibration is not necessarily in the opposite phase. The solution is to control the vibrator so that the vibration detected by the vibration sensor becomes smaller.

As explained above, in the present invention, a soundproof wall is provided at 5 to cover at least the circumferential side of the stationary induction electric appliance body, and a vibration sensor and a vibration exciter are attached to this soundproof wall. A soundproof wall has air on both sides and is much easier to vibrate than a container filled with insulating oil, so according to the present invention, a small vibrator can
Alternatively, it is possible to efficiently suppress the vibration of the soundproof wall and reduce noise with a small number of vibrators. In addition, since the vibration sensor and exciter are mounted inside the soundproof wall, they are fully protected against wind and rain, ensuring stable operation over a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing an example of a conventional transformer with a soundproof wall, Figs. 5 is a block diagram showing a control system in the low noise transformer of FIG. 4; 6th WA shows a low noise transformer according to another embodiment of the present invention; FIG. 5 is a block diagram showing a control system in the low noise transformer of FIG. 4; Cross section, 11
Figures 7 to 9 are perspective views showing how the vibrator is attached to the soundproof wall. 1...Transformer body, 2...Container, 3.
3m...Soundproof wall, 4...Side plate, 5...
...Reinforcement stay, 6...9 intervals, 10...
... Vibration sensor, 11... Vibrator, 12...
...control device, 2G...beam. Figure 1 Figure 2 Figure 3 Figure #I4 Figure 5 Figure 6 Figure 7

Claims (1)

[Scope of Claims] 1. A stationary induction electric appliance body in which an iron core and a cross-wire are housed in a housing circle and filled with insulating oil, and a soundproof wall provided so as to cover at least the circumferential side of the stationary induction electric appliance body. Something with? In the lc, a vibration sensor that detects the vibration of the soundproof wall and a vibrator that excites the soundproof wall are installed inside the soundproof wall, and the vibration sensor detects the vibration of the soundproof wall. A low-noise stationary induction electric appliance 02 characterized in that it is provided with a control device that controls the output of the machine so that the vibration of the soundproof wall is suppressed. In claim 1, the control device is installed in a space between the stationary induction appliance main body and a soundproof wall. A low-noise stationary induction electric appliance 0 4, IP! characterized in that the wall is provided with a 11-shaft and a reinforcing stay, and the vibration exciter is attached to the reinforcing stay. lIn-Claim @Claim 1, wherein the soundproof wall includes a side plate, a reinforcing stay, and a beam connecting the reinforcing stay, and the vibration exciter is attached to the beam. Stationary induction WiIO