JP2012251644A - Generator foundation stand and magnetic shield thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an influence on a steel plate due to a magnetic flux leaking from a bushing drawing electric power from a generator to a bus line for power transmission toward the steel plate of a support structure in a generator foundation stand to which a steel plate concrete structure is applied.SOLUTION: The generator foundation stand 1 includes: the support structure 4 to which the steel plate concrete structure surrounding the periphery with the steel plate 2 and placing concrete 3 inside thereof is applied and erected from a foundation bottom 21 of a turbine building to support the generator 6; and a magnetic shield 5 provided in a region where the bushing 11a for supplying electric power from the generator 6 to a phase separation bus connection terminal arranged under the generator 6 and the support structure 4 are opposed to each other, and applying a high permeability material having higher permeability than that of the steel plate, or a metal material having high electric conductivity.

Description

  The present invention relates to a generator base that supports a generator in a power plant and a magnetic shield thereof.

  In a nuclear power plant and a thermal power plant, steam generated by a nuclear reactor, a steam generator, and a boiler is sent to a turbine for work, and a generator connected to the turbine is rotated to generate electric power. Here, the generator is supported by a support structure erected from the foundation bottom at a position spaced upward from the foundation bottom of the turbine building. This is because the condenser is usually installed below the turbine, so the turbine needs to be installed above the bottom of the foundation, and the turbine and the generator are connected coaxially.

  Conventionally, the reinforced concrete structure was generally applied to the generator foundation, but the technology to apply the steel plate concrete structure to the generator foundation was mainly disclosed to shorten the construction period of the power plant. (For example, refer to Patent Document 1). The steel plate concrete structure is a structure obtained by replacing a conventional reinforced concrete structure with a steel plate. The steelwork can also be used as a formwork for placing concrete, so there is no need for formwork work, and it is possible to make a block that incorporates a buried part such as a conduit when manufacturing the steel sheet, greatly reducing the construction period. it can.

Japanese Examined Patent Publication No. 7-21208

  However, in the technique described in Patent Document 1 described above, the magnetic flux leaked from the bushing that draws the electric power of the generator to the phase separation bus is absorbed by the steel plate of the support structure, and an eddy current due to electromagnetic induction is generated, and the steel plate generates heat. There was a possibility that a new problem would arise.

  Therefore, the present invention has an object to provide a generator base that applies a steel plate concrete structure that reduces the influence of a steel plate due to a magnetic flux that leaks from a bushing that draws the power of the generator to a phase-separated bus and travels to the steel plate of a support structure. And

In order to achieve the above object, the generator base stand of the present invention is applied to a steel plate concrete structure in which concrete is surrounded by a steel plate and concrete is placed inside, and a support structure that is erected from the bottom of the foundation and supports the generator When,
A high-conductivity material made of a high-permeability material with a higher permeability than a steel plate or a metal material with a higher electrical conductivity, provided in the area where the bushing that draws the power of the generator / generator to the power transmission bus and the support structure face each other And a magnetic shield to which is applied.

  Furthermore, in order to achieve the above object, the magnetic shield of the present invention has a steel plate concrete structure in which the periphery is surrounded by a steel plate and concrete is cast inside, and the support structure is installed from the foundation bottom of the turbine building and supports the generator. In a generator base having a body, a bushing for supplying power from a generator to a power transmission bus and a support structure are provided in a region facing each other, and a high permeability material having a higher permeability than a steel plate or a high electrical conductivity A high conductivity material made of a metal material is applied.

  According to the present invention, in a generator base using a steel plate concrete structure, it is possible to reduce the influence of the steel plate due to the magnetic flux leaking from the bushing that draws the power of the generator to the power transmission bus and going to the steel plate of the support structure. .

The schematic longitudinal cross-sectional view of the generator base stand which concerns on the 1st Embodiment of this invention. The schematic top view of the generator base stand concerning the 1st Embodiment of the present invention. The AA arrow directional view in FIG. 1 of the generator base stand which concerns on the 1st Embodiment of this invention. The schematic longitudinal cross-sectional view which shows the example which made the magnetic shield of the generator base stand which concerns on the 1st Embodiment of this invention a part of phase separation bus-line connection terminal box. The schematic longitudinal cross-sectional view which shows the example which made the magnetic shield of the generator base stand which concerns on the 1st Embodiment of this invention a part of generator terminal boxes. The generator base stand concerning the 1st Embodiment of this invention is shown, (a) is a schematic top view which provided the support structure in parallel on both sides which pinched | interposed the rotating shaft of the generator, (b) was U-shaped. The schematic cross-sectional view which provided the support deck in the support structure of a shape, (c) is the schematic cross-sectional view which provided the support structure in the four corners of the support deck. The schematic longitudinal cross-sectional view of the generator base stand concerning the 2nd Embodiment of this invention. The direction of the magnetic flux of the generator base stand which concerns on the 2nd Embodiment of this invention is shown, (a) is a schematic perspective view which shows the case where a notch part is not provided, (b) is the outline which shows the case where a notch part is provided. Perspective view. The steel plate of the generator foundation which concerns on the 3rd Embodiment of this invention is shown, (a) is a schematic perspective view which shows the example which used the notch part as a slit, (b) is the example which provided the insulator in the slit. The schematic perspective view shown. The schematic longitudinal cross-sectional view of the generator base stand concerning the 4th Embodiment of this invention.

  Embodiments of the present invention will be described below.

(First embodiment)
(Constitution)
Hereinafter, the generator base according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 6. FIG. 1 is a schematic longitudinal sectional view of a generator base stand according to the first embodiment of the present invention.

  The generator base 1 is composed of a support structure 4 and a magnetic shield 5. The generator base 1 supports the generator 6 with a fixture 7 provided on the upper surface 4 a of the support structure 4. A generator terminal box 8 is provided below the generator 6, and as shown in FIG. 3, the bushing 11 includes a power transmission bushing 11 a and a grounding bushing 11 b, and below the generator terminal box 8, A phase separation bus connection terminal box 9 and a neutral point interphase connection terminal box 18 are provided via a power transmission bushing 11a and a grounding bushing 11b.

  The support structure 4 includes a steel plate 2 that surrounds the periphery thereof to form a concrete container, and a steel plate concrete structure in which the concrete 3 is placed inside the concrete container is applied, and is erected from the foundation bottom 21 of the turbine building. FIG. 2 is a schematic top view of the generator base according to the first embodiment of the present invention. As shown in FIG. 2, the support structure 4 has a square shape in which the horizontal cross section surrounds the generator 6. Fixing tools 7 are provided on both side surfaces of the generator 6, and bolts 7 a are passed through the fixing tools 7 from above and driven into the upper surface 4 a of the support structure 4 to fix the fixing tool 7 to the support structure 4.

  Further, as shown in FIG. 1, in order to support the support structure 4 and the generator 6 close to each other, the support structure 4 has an inclined surface that approaches the generator 6 vertically upward. In addition, the support structure 4 may be formed not only integrally from the base bottom 21 to the upper surface 4a on which the fixture 7 is provided, but may be formed by combining a plurality of members made of steel plate concrete.

  A generator terminal box 8 is provided below the generator 6. The generator terminal box 8 accommodates a power transmission generator terminal 8a for drawing the electric power generated by the generator 6 to the outside, and a grounding generator terminal (not shown) for grounding the generator 6. .

  FIG. 3 is an AA arrow view in FIG. 1 of the generator base stand according to the first embodiment of the present invention. As shown in FIG. 3, a phase separation bus connection terminal box 9 and a neutral point phase connection terminal box 18 are provided below the generator terminal box 8 via a power transmission bushing 11a and a grounding bushing 11b, respectively. The phase separation bus connection terminal box 9 normally accommodates three phase separation bus connection terminals 10.

  The three phase separation bus connecting terminals 10 are connected to the three phase separation buses 22 respectively. The phase separation bus 22 is a power transmission bus that transmits the power of the generator 6 to the outside. Further, the neutral point phase connection terminal box 18 accommodates three neutral point phase connection terminals 19 for grounding the three-phase AC power by a neutral point ground resistor (not shown).

  The three power transmission bushings 11 a connect the power transmission generator terminal 8 a and the phase separation bus connection terminal 10, respectively. The electric power of the generator 6 is taken out by the power transmission generator terminal 8a and is supplied as three-phase AC power to the phase separation bus 22 through the power transmission bushing 11a and the phase separation bus connection terminal 10. The three grounding bushings 11b connect the grounding generator terminal and the neutral point phase connection terminal 19, respectively. The neutral point phase-to-phase connection terminals 19 are respectively connected to a neutral point grounding resistor and ground the neutral point of the generator 6.

  The magnetic shield 5 is provided at a position facing the bushing 11 in the steel plate 2 of the support structure 4 so as to be separated from the steel plate 2 via the support member 5a. A portion of the steel plate 2 of the support structure 4 that faces the bushing 11 is, for example, an inclined surface that approaches the generator 6 in the vertically upward direction shown in FIG. Furthermore, in order to prevent heat generated in the magnetic shield 5 from being transmitted to the steel plate 2, a material having low thermal conductivity may be provided between the steel plate 2 and the magnetic shield 5 as a heat insulating material.

  The magnetic shield 5 can be made of a high permeability material or a high conductivity material. As the high magnetic permeability material, a material having higher magnetic permeability and higher magnetic field confinement efficiency than the steel plate 2 such as ferrite, permalloy, or silicon steel plate can be used. In addition, a metal material having high electrical conductivity such as aluminum or copper can be used as the high conductivity material.

(Function)
The operation of the first embodiment of the present invention will be described below. During operation of the generator 6, electric power generated by the generator 6 is taken out by the generator terminal 8 a in the generator terminal box 8 and supplied to the phase separation bus connection terminal 10 by the bushing 11. Furthermore, a current related to the grounding of the generator 6 flows to the neutral point phase connection terminal 19 through the bushing 11.

  At this time, the magnetic flux 31 leaks around the bushing 11 due to the current flowing through the bushing 11. When the magnetic shield 5 is not provided, the magnetic flux 31 is absorbed by a portion of the steel plate 2 of the support structure 4 that faces the bushing 11, and an eddy current due to electromagnetic induction is generated, which may generate heat in the steel plate 2.

  First, an operation when a high permeability material is applied as the magnetic shield 5 will be described. In this case, the magnetic flux 31 leaking from the bushing 11 toward the steel plate 2 is absorbed by the magnetic shield 5 to generate heat, and the magnetic flux 31 is absorbed by the steel plate 2 and prevented from generating heat. Furthermore, it is good also as a structure which provides a fin and uneven | corrugated shape in the surface of the magnetic shield 5, and thermally radiates the heat | fever generate | occur | produced in the magnetic shield 5 efficiently.

  Next, an operation when a high conductivity material is applied as the magnetic shield 5 will be described. When the magnetic flux 31 leaking from the bushing 11 has a high frequency, an eddy current flows through the magnetic shield 5 by changing the strength of the magnetic flux 31 passing through the magnetic shield 5 made of a high conductivity material. The magnetic flux generated from the magnetic shield 5 by this eddy current is in a direction to cancel the magnetic flux 31 leaking from the bushing 11, and thus acts as a shield for the magnetic flux 31.

  The present embodiment can be modified as follows. FIG. 4 is a schematic longitudinal sectional view showing an example in which the magnetic shield of the generator base according to the first embodiment of the present invention is part of the phase separation busbar connection terminal box. As shown in FIG. 4, the side surface of the phase separation bus connection terminal box 9 is extended to surround the side periphery of the bushing 11, and the above-described strong magnetic permeability material and electrical resistance are formed on the side surface of the phase separation bus connection terminal box 9. Apply a low rate material. In this case, the action of the magnetic shield 5 can be provided on the side surface of the phase separation bus connection terminal box 9. Not only the side surface of the housing of the phase separation bus connection terminal box 9 is configured by the magnetic shield 5, but also a configuration in which the magnetic shield 5 is attached to the side surface of the housing of the phase separation bus connection terminal box 9 may be provided. .

  FIG. 5 is a schematic longitudinal sectional view showing an example in which the magnetic shield of the generator base stand according to the first embodiment of the present invention is part of the generator terminal box. As shown in FIG. 5, the generator terminal box 8 is configured to surround the generator terminal 8 a and the bushing 11, and a strong magnetic permeability material or a material with low electrical resistivity is applied to the generator terminal box 8. In this case, the function of the magnetic shield 5 can be given to the generator terminal box 8. In addition, it is not restricted to the modification mentioned above, If the magnetic shield 5 is inserted in the area | region where the steel plate 2 and the bushing 11 of the support structure 4 oppose, the same effect | action can be exhibited.

  Further, the support structure 4 can be modified as follows. FIG. 6 shows a generator base according to the first embodiment of the present invention, in which (a) is a schematic top view in which support structures are provided in parallel on both sides of the rotating shaft of the generator, (b). Is a schematic cross-sectional view in which a support deck is provided on a U-shaped support structure, and (b) is a schematic cross-sectional view in which support structures are provided at four corners of the support deck.

  As shown to Fig.6 (a), it can be set as the structure which provides the support structure 4 in parallel on both sides which pinched | interposed the rotating shaft 6a of the generator 6, and supports the both sides | surfaces of the generator 6 with the fixing tool 7. FIG. . Further, as shown in FIG. 6B, a flat support deck 12 is provided on a support structure 4 having a U-shaped horizontal section, and a generator 6 is disposed on the upper surface of the support deck 12 to fix the fixture. 7 can be used. Further, as shown in FIG. 6C, the four corners of the flat support deck 12 are supported by four support structures 4, and the generator 6 is arranged on the upper surface of the support deck 12 and fixed by the fixture 7. It can be. In this case, the four support structures 4 may be connected to each other with beams to increase the strength. In the case of FIG. 6B and FIG. 6C, the bushing 11 and the phase separation bus connection terminal box 9 are provided below the support deck 12.

  Also in the support structure 4 shown in FIGS. 6A, 6B, and 6C, the magnetic flux leaking from the bushing 11 by providing the magnetic shield 5 in the region where the bushing 11 and the steel plate 2 face each other. The influence of 31 on the steel plate 2 can be reduced. Furthermore, you may provide the magnetic shield 5 in the site | part which opposes the bushing 11 among the support decks 12 shown in FIG.6 (b) and FIG.6 (c).

(effect)
According to the first embodiment of the present invention, the steel plate 2 is provided by providing the magnetic shield 5 in the region where the steel plate 2 and the bushing 11 of the support structure 4 of the generator base 1 to which the steel plate concrete structure is applied are opposed to each other. It is possible to prevent the magnetic flux 31 from being absorbed and the steel plate 2 from generating heat.

(Second Embodiment)
(Constitution)
Hereinafter, the generator base according to the second embodiment of the present invention will be described with reference to FIGS. 7 and 8. The same parts as those of the generator base according to the first embodiment are denoted by the same reference numerals, and the description of the same configuration is omitted.

  FIG. 7 is a schematic longitudinal sectional view of a generator base base according to the second embodiment of the present invention. The second embodiment is different from the first embodiment in that a notch 13 is provided in the steel plate 2 in place of the magnetic shield 5. The notch 13 is provided in a portion of the steel plate 2 of the support structure 4 that faces the bushing 11.

(Function)
The operation of the second embodiment of the present invention will be described below. FIG. 8: shows the magnetic flux of the generator base stand concerning the 2nd Embodiment of this invention, (a) is a schematic perspective view which shows the case where a notch part is not provided, (b) is the case where a notch part is provided. It is a schematic perspective view shown. As shown in FIG. 8A, the magnetic flux 31 leaked by the bushing 11 is directed to the steel plate 2 at a portion facing the bushing 11, and there is a possibility that the heat will be locally generated by one heat generating portion 2 a. Therefore, as shown in FIG. 8 (b), by providing the notch portion 13 in the steel plate 2 at the portion facing the bushing 11, the heat generating portion 2a of the steel plate 2 to which the magnetic flux 31 is directed is dispersed and locally at one location. Heat generation can be prevented. Further, a reinforcing member having a lower magnetic permeability than that of the steel plate 2 may be provided in the cutout portion 13 so that the heat generating portion 2a is dispersed around the cutout portion 13 and the cutout portion 13 is reinforced by the reinforcing member.

(effect)
According to the second embodiment of the present invention, the heat generating portion of the steel plate 2 to which the magnetic flux 31 leaked by the bushing 11 is directed by providing the notch portion 13 in the portion of the steel plate 2 of the support structure 4 facing the bushing 11. 2a can be dispersed to prevent local heat generation at one place.

(Third embodiment)
(Constitution)
Hereinafter, a generator base according to a third embodiment of the present invention will be described with reference to FIG. The same parts as those of the generator base according to the first embodiment are denoted by the same reference numerals, and the description of the same configuration is omitted. FIG. 9 shows a steel plate of a generator base according to the third embodiment of the present invention, (a) is a schematic perspective view showing an example in which a notch is a slit, and (b) is an insulator in the slit. It is a schematic perspective view which shows the example provided. The slit 14 is formed by notching the steel plate 2 at a portion facing the bushing 11 into a plurality of parallel groove shapes.

(Function)
The operation of the third embodiment of the present invention will be described below. In FIG. 9A, the cutout portion 13 is a slit 14 cut out in a plurality of parallel groove shapes. With this configuration, heat generation is suppressed by dispersing the eddy current generated by the magnetic flux 31 being absorbed by the steel plate 2.

  In FIG. 9B, the insulator 15 is provided in the slit 14. With this configuration, the insulator 15 forms a part of the concrete container and increases the strength of the support structure 4 while dispersing the eddy current generated by the magnetic flux 31 being absorbed by the steel plate 2.

  Furthermore, a concrete container is formed by providing the insulator 15 in the slit 14 of the steel plate 2, and the concrete 3 can be placed in the concrete container. Moreover, you may comprise the concrete container which not only provides the insulator 15 in the slit 14, but casts the concrete 3 by combining the steel plate 2 and the insulator 15 alternately.

(effect)
According to the third embodiment of the present invention, the slits 14 are formed in the steel plate 2 at the portion facing the bushing 11, thereby suppressing the heat generation by dispersing the eddy current generated by the magnetic flux 31 being absorbed by the steel plate 2. be able to.

(Fourth embodiment)
(Constitution)
Hereinafter, a generator base according to a fourth embodiment of the present invention will be described with reference to FIG. The same parts as those of the generator base according to the first embodiment are denoted by the same reference numerals, and the description of the same configuration is omitted. FIG. 10 is a schematic longitudinal sectional view of a generator base base according to the fourth embodiment of the present invention. The third embodiment is different from the first embodiment in that a cooling device 16 and a cooling unit 17 are provided in place of the magnetic shield 5.

  The cooling part 17 is provided in the site | part which opposes the bushing 11 among the steel plates 2 of the support structure 4, and material with high heat conductivity, such as copper and aluminum, is applied. Further, the cooling device 16 and the cooling unit 17 are connected by a heat pipe or the like so that the cooling unit 16 can circulate the refrigerant to cool the cooling unit 17.

(Function)
The operation of the fourth embodiment of the present invention will be described below. The cooling device 16 supplies and circulates a coolant such as air, water, and paraffin to the cooling unit 17, and cools the heat generated in the steel plate 2 by the cooling unit 17.

  Further, by applying the above-described magnetic shield 5 to the cooling unit 17, the cooling unit 17 can be cooled while the cooling unit 17 itself generates heat. Further, not only the cooling device 16 is configured to circulate the refrigerant to the cooling unit 16, but also the cooling device 17 is used as a blower to blow cooling air to a portion of the steel plate 2 of the support structure 4 facing the bushing 11. It is good. Moreover, it is good also as a structure which forms the flow path which can distribute | circulate the refrigerant | coolant from the cooling device 16 to the steel plate 2. FIG.

(effect)
According to the fourth embodiment of the present invention, the heat generated when the magnetic flux 31 leaked from the bushing 11 by the cooling device 16 is absorbed by the steel plate 2 can be cooled.

  Needless to say, the embodiment of the present invention is not limited to the above-described embodiment. For example, the height of the support structure 4, the number of bushings 11 and phase separation bus connection terminals 10, the fixing position of the generator 6 of the fixture 7, etc. are the power of the turbine, the capacity of the condenser, the structure of the turbine building, etc. Can be changed as appropriate. Further, the present invention can be applied not only to a power plant in which the turbine building and the boiler building are independent, but also to a power plant having a building in which the turbine building and the boiler building are integrated.

  Further, not only the generator terminal 8a is accommodated in the generator terminal box 8, but the generator terminal 8a is accommodated in the housing of the generator 6, or the bushing 11 is directly removed without the generator terminal 8a. It is good also as a structure which draws out the electric power of the generator 6 by. Further, not only the configuration in which the phase separation bus connection terminal 10 and the phase separation bus 22 accommodated in the phase separation bus connection terminal box 9 are connected, but also the end portion of the phase separation bus 22 and the bushing are omitted by omitting the phase separation bus connection terminal 10. 11 may be connected directly.

  Furthermore, you may provide the magnetic shield 5 and the notch part 13 which were mentioned above in the site | part which opposes and adjoins the generator terminal box 8 and the phase separation bus-line connection terminal 10 among the steel plates 2 of the support structure 4. At this time, absorption of the magnetic flux 31 leaking from the generator terminal box 8 and the phase separation bus connection terminal 10 into the steel plate 2 of the support structure 4 and heat generation due to absorption of the magnetic flux 31 into the steel plate 2 of the support structure 4 are suppressed. be able to.

  Furthermore, as a power transmission bus for transmitting the power of the generator 6 drawn out by the power transmission bushing 11a to the outside, not only the phase separation bus 22 sealed with an independent metal sheath for each phase of the AC power, It is also possible to apply phase non-separated buses that are not separated for each phase.

  Furthermore, the power transmission bus composed of the phase-separated bus 22 or the phase non-separated bus is not limited to being installed below the generator. For example, in a hydroelectric power plant, the generator 6 is arranged with the rotation axis being vertical, and the power transmission bus is arranged apart from the side peripheral surface of the generator 6. At this time, the generator base 1 to which the steel plate concrete structure is applied is a structure that supports the generator 6 from the surroundings, and the bushing 11 is arranged so that the power of the generator 6 is separated from the side peripheral surface of the generator 6. It is provided to be drawn out to the transmission bus. The first to fourth embodiments described above can be combined as appropriate.

DESCRIPTION OF SYMBOLS 1 ... Generator base 2 ... Steel plate 2a ... Heat generating part 3 ... Concrete 4 ... Support structure 4a ... Upper surface 5 ... Magnetic shield 5a ... Support member 6 · · Generator 6a · · · rotating shaft 7 · · · fixture 7a · · · bolt 8 · · · generator terminal box 8a · · · power transmission generator terminal 9 · · · phase separation bus connection terminal box 10 ··· Phase separation bus connection terminal 11 ··· bushing 11a · · · bushing for power transmission 11b · · · bushing for grounding 12 · · · support deck 13 · · · notch 14 · · · slit 15 · · · insulator 16 ... Cooling device 17 ... Cooling part 18 ... Neutral point phase connection terminal box 19 ... Neutral point phase connection terminal 21 ... Base bottom part 22 ... Phase separation bus 31 ... Magnetic flux

Claims (10)

A steel plate concrete structure in which the periphery is surrounded by a steel plate and concrete is placed inside is applied, and a support structure that is erected from the bottom of the foundation and supports a generator
High conductivity made of a high permeability material or a metal material having a higher electrical conductivity than the steel plate, provided in a region where the bushing for drawing the power of the generator to the power transmission bus and the support structure are opposed to each other A generator base comprising a magnetic shield to which material is applied.   The generator base stand, wherein the magnetic shield is further provided in a region where the bushing connecting the neutral point phase connection terminal, the generator, and the support structure face each other.   The generator base according to claim 1, wherein the magnetic shield is provided in a portion of the steel plate of the support structure that faces the bushing.   The generator base according to claim 1, wherein the magnetic shield is a part of a housing of a generator terminal box that houses a generator terminal of the generator.   The generator base according to claim 1 or 2, wherein the magnetic shield is a part of a housing of a phase separation bus connection terminal box that accommodates the phase separation bus. A steel plate concrete structure is used, in which the periphery is surrounded by steel plates and concrete is placed inside, and includes a support structure that is erected from the bottom of the foundation of the turbine building and supports the generator.
The generator support base according to claim 1, wherein the support structure has a cutout portion formed by cutting out a portion of the steel plate facing the bushing.   The generator base according to claim 6, further comprising a reinforcing member having a permeability lower than that of the steel plate at the notch. A steel plate concrete structure is used, in which the periphery is surrounded by steel plates and concrete is placed inside, and includes a support structure that is erected from the bottom of the foundation of the turbine building and supports the generator.
The generator base is characterized in that the support structure has a slit formed by cutting out a portion of the steel plate facing the bushing into a plurality of groove shapes.   The generator base according to claim 8, further comprising an insulator provided in the slit. In the generator foundation having a support structure that supports the generator, the steel plate concrete structure that surrounds the periphery with steel plates and the concrete is cast inside is applied and is erected from the bottom of the foundation of the turbine building.
A high conductivity made of a high permeability material having a higher permeability than the steel plate or a metal material having a higher electrical conductivity, provided in a region where the bushing for supplying power from the generator to the power transmission bus and the support structure face each other. Magnetic shield for generator base, characterized in that rate material is applied.

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