JP2015070182A - Stationary induction electric device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce vibration containing wideband frequency components transmitted to a closed container via a magnetic shield, in a stationary induction electric device.SOLUTION: A stationary induction electric device includes a stationary induction electric device body 11, a closed container 1 for housing the stationary induction electric device body 11 and incorporating an insulation medium 5, a magnetic shield 9 supported on the inner wall of the closed container 1 and performing magnetic shielding from the stationary induction electric device body 11, and a stay 10 arranged between the closed container 1 and magnetic shield 9 and formed by laminating a plurality of planar base materials having different rigidity and attenuation factor. Preferably, the plurality of base materials include a steel sheet base material and an insulating base material, where the steel sheet base material is arranged at a position in contact with the closed container 1.

Description

  Embodiments described herein relate generally to a static induction appliance such as a transformer or a reactor, and more particularly to a static induction appliance having a magnetic shield for suppressing leakage magnetic flux during operation.

  In recent years, static induction appliances such as transformers and reactors have a structure in which a large electric field and magnetic field energy are confined in a smaller space due to an increase in capacity and a reduction in size and weight. In that case, it is known that leakage magnetic flux flows in a metal sealed container that contains the stationary induction main body and is filled with an insulating medium such as oil, resulting in increased loss of equipment and adverse effects on peripheral equipment. Yes. A magnetic shield is provided as a countermeasure against such leakage magnetic flux. The magnetic shield is provided in the hermetic container so as to magnetically shield the magnetic flux leaking from the main body of the stationary induction machine from leaking out of the metal hermetic container or the stationary induction machine.

  On the other hand, with the increase in capacity and downsizing of equipment, the vibration and noise generated from the static induction electric device body are filled in the solid propagation path that propagates through the member that supports the static induction electric device body and the sealed container. It is propagated to the sealed container by a propagation path in oil that propagates through the insulating oil. This vibration and noise tend to be emitted to the outside as a large noise by vibrating the bottom plate and the side plate constituting the sealed container.

  As means for reducing such conventional noise, there are a structure in which a stationary induction appliance is covered with a soundproof tank, a soundproof building, a soundproof wall or the like made of a steel plate or concrete, or a method of reinforcing a sealed container. . However, since the vibration source that is the source of noise is a static induction electric body with a coil and an iron core, methods for reducing the vibration of the static induction electric body and the vibration generated from the static induction electric body to the sealed container A method for reducing the amount of propagation is effective.

  Possible ways to reduce the amount of vibration generated from the static induction appliance body to the sealed container include installing a reinforcing material on the side plate of the sealed container and attaching a damping plate to the side plate of the sealed container. It is done.

  On the other hand, the sealed container side plate is provided with a magnetic shield for shielding leakage magnetic flux from the stationary induction electric appliance main body. This magnetic shield is attached to the inside of the sealed container side plate in a general static induction electric machine. Therefore, the vibration from the stationary induction body is propagated to the magnetic shield, propagated to the sealed container side plate via the stay supporting the magnetic shield, and is radiated to the outside of the sealed container as the side plate vibrates. .

JP 2013-65701 A Japanese Patent Publication No. 7-9857

  In order to solve the above-described problems, a configuration in which a countermeasure is taken for the method of attaching the magnetic shield has been proposed.

  For example, in Patent Document 1, in a static induction appliance such as a transformer or a reactor, wave ribs are formed in a vertical direction outside a tank containing an iron core and a coil, and stays are provided at predetermined intervals in the vertical direction on the inner wall of the tank. It is attached. This stay has a U-shaped cross section so that the magnetic shield plate can be inserted, and the magnetic shield plate is inserted into the U-shaped portion to support the magnetic shield. As a result, the cost of countermeasures and workability are improved as compared with the conventional method of fixing the magnetic shield to the tank surface with screws. Here, the U-shaped shape means that the outer shape is substantially rectangular and a rectangular groove is formed on one side.

  In Patent Document 2, a magnetic shield is straightly fixed to a gas insulated transformer inside a pressure vessel containing an iron core and a coil via a wave-shaped presser plate and fixing means, and a support member is also provided. It is fixed to the inner wall of the pressure vessel via This simplifies the installation work of the magnetic shield, and furthermore, since the insulating gas flows between the corrugated portion of the wave-shaped holding plate and the magnetic shield, the magnetic shield is also cooled from the back side. Can be greatly improved.

  However, in the case of these conventional structures, it is not considered to reduce the vibration transmitted from the transformer body directly to the side plate of the tank through the magnetic shield, and therefore based on the vibration of the pressure vessel side plate. There was a problem that a sound reduction effect could not be expected for radiated sound.

  An embodiment of the present invention has been made to solve the above-described problems, and includes a stationary induction electric body, a sealed container filled with an insulating medium and containing the stationary induction body, and a magnetic shield on a side plate of the sealed container In a static induction machine comprising: a magnetism capable of reducing vibration including a broadband frequency component transmitted to the sealed container through the magnetic shield even if vibration from the static induction appliance body propagates to the magnetic shield part It aims at providing the static induction electric machine provided with the shield support structure.

  In order to solve the above problems, a static induction electric machine according to an embodiment of the present invention houses a static induction electric body having an iron core and a winding, the static induction electric body, and encloses an insulating medium. A sealed container, a magnetic shield that is supported on the inner wall of the sealed container and shields the magnetic field from the stationary induction electric appliance body, and a plurality of plates that are disposed between the sealed container and the magnetic shield and have different rigidity and attenuation rate And a stay formed by laminating a plurality of base materials.

The horizontal sectional view of the static induction appliance concerning one embodiment of the present invention. FIG. 2 is a sectional view taken along the line II-II in FIG. 1. FIG. 3 is an elevation view illustrating a schematic configuration of the stay in FIG. 2. Sectional drawing which shows the laminated structure of the stay of one Embodiment of this invention. The model figure of a 1 degree-of-freedom vibration system. The graph which shows the vibration transfer function of a 1 degree-of-freedom vibration system. The expanded sectional view which shows the 1st modification of the stay of embodiment of FIG. The VIII line arrow directional view of FIG. The expanded sectional view which shows the 2nd modification of the stay of embodiment of FIG. The X-ray arrow line view of FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  The support structure of the magnetic shield shown in this embodiment can be applied to a structure in which a casing is covered around the vibration source, and is not limited to a static induction device, but a vibration source as shown in this embodiment. Any device having a vibration transmission system can be applied.

  An embodiment of the present invention will be described with reference to the drawings, taking as an example a stationary induction device in which a stationary induction device body is housed in a sealed container.

  FIG. 1 is a horizontal cross-sectional view showing a schematic configuration of an embodiment of a static induction electric machine that is one example of application of the present invention, and FIG. 2 is a vertical cross-sectional view taken along line II-II in FIG. is there.

  A stationary induction electric body 11 configured to include an iron core 3 and a winding 2 is housed in the sealed container 1. The inner space of the sealed container 1 is filled with an insulating medium 5 for insulating and cooling the stationary induction electric body 11. As the insulating medium 5, for example, liquid such as insulating oil, air, gas, or air is used.

  Between the hermetic container 1 and the stationary induction appliance main body 11, a magnetic shield 9 that extends in a plane along the inner surface of the hermetic container 1 is disposed. When vibration is generated in a direction from the stationary induction main body 11 toward the sealed container 1, the vibration is first transmitted to the magnetic shield 9 through the insulating medium 5. Here, the vibration of the magnetic shield 9 is propagated to the inner wall of the sealed container 1 through the structure supporting the magnetic shield.

  The magnetic shield 9 is supported on a side surface on the inner wall side of the sealed container 1 via a stay 10. FIG. 3 shows a schematic structure of the stay 10. In FIG. 3, the stay 10 includes two main stays 10A having a U-shaped cross section disposed parallel to the vertical direction of the magnetic shield 9 in accordance with the size of the magnetic shield 9, and a horizontal direction between the main stays 10A. The three horizontal stays 10B connected to each other and the six auxiliary stays 10C respectively connecting the horizontal stays 10B in the vertical direction are formed in a lattice shape.

  Here, as shown in FIG. 1, the U-shape is a shape whose outer shape is substantially rectangular, and a rectangular groove is formed on one side thereof. The two main stays 10A are arranged so that the groove portions of the U-shaped portion face each other.

  Both ends of the magnetic shield 9 are inserted along the U-shaped groove portion of the main stay 10A having a U-shaped cross section, and are supported by a stopper (not shown) provided at the lower end of the main stay 10A.

  Next, the cross-sectional structure of the stay 10 will be described with reference to FIG. FIG. 4 is a schematic view showing a cross section near the horizontal stay 10B in FIG.

  In FIG. 4, the horizontal stay 10 </ b> B is configured by laminating and laminating flat base materials made of materials having different rigidity and attenuation rate. In the present embodiment, the horizontal stay 10 </ b> B has a first base material 21 made of, for example, a steel plate having a high rigidity and a low attenuation rate, and a second base material 22 having a lower rigidity and a higher attenuation rate than the first base material 21. Then, a third base material 23 having a rigidity lower than that of the second base material 22 and a large attenuation rate is laminated in the order of the first base material 21, the second base material 22, and the third base material 23. It has a three-layer structure formed by bonding with an adhesive. The first base material 21 made of a steel plate having a high rigidity and a small damping rate is fixed to the inner wall of the sealed container 1 by welding or the like. The third base material having the lowest rigidity and the highest attenuation rate is arranged so as to be in close contact with the magnetic shield 9.

  Although not shown, the main stay 10A and the auxiliary stay 10C have a laminated structure similar to the horizontal stay 10B.

  Here, the model of the one-degree-of-freedom vibration system and the characteristics of the vibration transfer function will be described with reference to FIGS. FIG. 5 shows a model diagram of a one-degree-of-freedom vibration system. FIG. 6 shows a graph of the vibration transfer function in the configuration of FIG.

  As shown in FIG. 5, it is assumed that the object 31 is supported by the fixing portion 34 via a spring 32 and a damper 33 arranged in parallel with each other.

  A dotted line 41 in FIG. 6 is a graph showing a vibration transfer function of a general one-degree-of-freedom vibration system model. The vibration transfer function shows a maximum value when the frequency matches the natural frequency f0. In addition, the greater the damping in the frequency range lower than the natural frequency f0, the smaller the vibration transmission, and the higher the rigidity in the frequency range higher than the natural frequency f0, the lower the vibration transmission. Therefore, when the damping rate is increased, as shown by the one-dot chain line 42, the vibration transmissibility becomes small and the vibration can be reduced in the low frequency range, but the vibration transmissibility becomes large and the vibration increases in the high frequency range. Therefore, in order for the stay 10 to obtain a vibration reduction effect in a wide frequency range, that is, in order to obtain a vibration reduction effect as indicated by the solid line 43, it is desirable that the damping is large in the low frequency range and the rigidity is high in the high frequency range. .

  For this reason, in the configuration of the present embodiment, a material having a large damping factor with respect to vibrations in a low frequency range and a vibration in a high frequency range so that the vibration transfer function indicated by the solid line 43 can be realized. They use materials with high rigidity and low damping rate.

  In the present embodiment, with the above-described configuration, when the low-frequency vibration generated from the stationary induction main body 11 propagates to the magnetic shield 9 and the magnetic shield 9 vibrates, the magnetic shield 9 has rigidity. Since it is in contact with the low and large damping material, the vibration in the low frequency range transmitted to the sealed container 1 via the stay 10 can be reduced. In addition, with respect to vibrations in the high frequency range, the vibrations in the high frequency range transmitted to the sealed container 1 can be reduced by being in contact with a material having high rigidity and a small attenuation rate.

  In the present embodiment, two main stays 10A of the stay 10 are provided on the inner surface of the sealed container 1 so as to extend in the vertical direction, and the magnetic shield 9 is vertically extended along the groove portion of the U-shaped portion of the main stay 10A. It was slid in the direction and supported by the main stay 10A. On the other hand, the main stay 10A having a U-shaped cross section with respect to the hermetic container 1 is disposed in parallel so as to extend in the horizontal direction so as to extend in the horizontal direction, and the magnetic shield 9 is arranged in the horizontal direction of the hermetic container 1. You may make it slide and insert along the groove part of the U-shaped part of the main stay 10A, and you may make it support.

  Alternatively, after combining the U-shaped portion of the main stay 10A with the magnetic shield 9 in advance, the main stay 10A may be fixed to the sealed container 1 with a bolt or the like. The means for attaching the magnetic shield 9 may be appropriately selected according to the installation environment, and the shape of the main stay 10A may be any structure that can support the magnetic shield 9.

  Further, the number of main stays 10A, horizontal stays 10B, and auxiliary stays 10C is not limited to the number in the present embodiment, and the number may be increased or decreased as necessary.

  FIG. 7 is an enlarged cross-sectional view showing a modification (first modification) of the embodiment shown in FIG. FIG. 8 is a view taken along line VIII in FIG. In this modification, a plurality of linear slits (grooves) 51 that are parallel to each other are formed on the surface of the third base member 23 that is in contact with the magnetic shield 9, and are parallel to each other between the adjacent slits 51. A plurality of straight linear protrusions 52 are formed. Thereby, a border-shaped contact surface is formed. By applying such processing to the contact surface of the stay 10 with the magnetic shield 9, it is possible to realize an optimum attenuation factor necessary for vibration reduction.

  FIG. 9 is an enlarged cross-sectional view showing still another modified example (second modified example) of the embodiment shown in FIG. FIG. 10 is a view taken in the direction of the X-ray in FIG. In this modification, grid-like irregularities are formed on the surface of the third base material 23 that is in contact with the magnetic shield 9. That is, the square-shaped convex part (columnar part) 53 and the square-shaped recessed part 54 of the same dimension as this are lined up alternately in length and breadth. By applying such processing to the contact surface of the stay 10 with the magnetic shield 9, it is possible to realize an optimum attenuation factor necessary for vibration reduction.

  In the above embodiment, the lattice-like stay 10 constituted by the main stay 10A, the horizontal stay 10B, and the auxiliary stay 10C is attached to the inner surface of the sealed container 1. However, the main stay 10A, the horizontal stay The auxiliary stay 10C may be arranged on a rectangular diagonal line formed by 10B. By configuring in this way, it is possible to reduce the generated noise based on the complicated vibration mode of the hermetic container 1, and further improve the strength of the entire stay.

  According to the above configuration, a reduction effect of vibration propagation over a plurality of frequency ranges can be obtained by stacking a plurality of base materials made of materials having different rigidity and damping rate into a laminated structure. The vibration propagated from the static induction electric device main body to the magnetic shield is a low frequency vibration of 100 Hz to 120 Hz when energized, and a plurality of vibrations from a low frequency of 100 Hz to 500 Hz to a high frequency when excited. Occur. As for the vibration in the low frequency range, the substrate having a larger attenuation rate has a larger vibration reduction effect, and for the vibration in the high frequency region, the substrate having higher rigidity has a larger vibration reduction effect.

  In this embodiment, the use of the stay having a multilayer structure of base materials having different rigidity and damping rate reduces the amount of vibration transmitted to the sealed container by vibration having a plurality of frequency ranges of the stationary induction electric appliance main body. The noise radiated outside the sealed container can be reduced. Therefore, a large soundproof structure such as a soundproof tank or a soundproof building that covers the outside of the sealed container in which the static induction electric appliance body is housed is unnecessary, or a simple structure can be achieved. Can be realized.

  Moreover, the reinforcement effect of a closed container side plate is also acquired by forming the base material used as the attachment part to a closed container of a stay with a material with high rigidity like a steel plate.

  Furthermore, by arranging the stays in a lattice pattern with respect to the inner wall surface of the sealed container, it is possible to reduce noise based on higher-order plate vibrations of the sealed container side plate.

  As mentioned above, although embodiment of this invention was described, this embodiment is shown as an example and is not intending limiting the range of invention. This embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

1 ... Airtight container, 2 ... Winding,
3 ... iron core, 5 ... insulating medium,
9 ... Magnetic shield, 10 stays,
10A ... Main stay, 10B ... Horizontal stay,
10C ... Auxiliary stays, 11 ... Stationary induction body,
21 ... 1st base material, 22 ... 2nd base material,
23 ... Third substrate 31 ... Object,
32 ... Spring, 33 ... Damper,
34 ... fixed part, 51 ... slit (groove),
52 ... Projection part, 53 ... Projection part (columnar part),
54 ... recess

Claims (4)

A static induction machine body with an iron core and windings;
A sealed container that houses the stationary induction body and in which an insulating medium is enclosed;
A magnetic shield that is supported on the inner wall of the hermetic container and performs magnetic shielding from the stationary induction body; and
A stay formed between the sealed container and the magnetic shield, and formed by laminating a plurality of plate-like base materials having different rigidity and damping rate;
A static induction appliance characterized by comprising:   The stationary induction device according to claim 1, wherein the plurality of base materials include at least one steel plate base material and at least one insulating base material.   The stationary induction device according to claim 2, wherein the at least one steel plate base material is disposed at a position in contact with the sealed container.   The uneven | corrugated | grooved part is formed in the surface facing the said magnetic shield of the base material adjacent to the said magnetic shield among these several base materials, The Claim 1 thru | or 3 characterized by the above-mentioned. Static induction machine.

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