JP2006134587A - Electric field concentration control material, electric field concentration control member, and electric apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric field concentration control material relaxing concentration of an electric field when one is impressed, effectively restraining generation of partial discharge, treeing or the like, capable of maintaining an excellent insulation property for a long time. <P>SOLUTION: The electric field concentration control material is a complex material made by dispersing filling material in resin material. The filling material is relatively conductive comparing with the resin material. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electric field concentration suppressing material in which deterioration of electrical insulation is suppressed by relaxing electric field concentration when an electric field is applied, an electric field concentration suppressing member using the same, and an electric device.

  There is an electrical deterioration as a deterioration form of an insulating material used for an electric device, and a part thereof shows a deterioration pattern with treeing. Treeing refers to a phenomenon in which when a high electric field is generated in an insulating material, the insulating material is dissolved or carbonized while being accompanied by discharge starting from an electrode end or impurities in the insulating material.

  Conventionally, in order to stop the progress of the tree, a structure in which film materials are laminated and an insulating material filled with mica, silica or the like are used. For example, in an insulating coil, for a tape-shaped or sheet-shaped insulating material including a layer having small mica flakes, boron nitride, aluminum nitride, silicon nitride, aluminum oxide, in a resin layer disposed in the space of the mica flake layer, Inclusion of particles having a thermal conductivity of 5 W / mK or more, such as magnesium oxide, beryllium oxide, silicon carbide, etc., at least 90% by weight of which has a particle size of 0.1 to 15 μm (for example, (See Patent Document 1).

  Further, in an ignition coil composed of a rod-shaped core and a primary spool and a secondary spool provided on the outer periphery of the core, glass fiber and silica are added to a resin base at least one of the primary spool and the secondary spool. The insulation breakdown of the spool, which is an insulating material, is formed (see, for example, Patent Document 2).

However, in the insulating material having a structure in which films are laminated, the manufacturing method is greatly limited, and applicable members are limited. In addition, the insulating material filled with mica, silica or the like has a problem that the life against electrical deterioration is not sufficient.
Japanese Unexamined Patent Publication No. 63-110929 JP 2002-374646 A

  The present invention has been made to solve the above-described problems, and it is possible to suppress the occurrence of treeing by relaxing the concentration of the electric field when an electric field is applied, and to extend the lifetime. An object of the present invention is to provide a concentration suppressing material, an electric field concentration suppressing member using the same, and an electric device.

  The electric field concentration suppressing material of the present invention is a composite material in which a filler is dispersed in a resin material, and the filler has conductivity as compared with the resin material. The electric field concentration suppressing material of the present invention is a composite material in which a filler is dispersed in a resin material, and the filler has a nonlinear resistance characteristic with respect to an applied electric field.

  The electric field concentration suppressing member of the present invention is characterized in that the electric field concentration suppressing material as described above is cured by placing it in a paint, film or tape or mold. Moreover, the electric device of the present invention is characterized by using the electric field concentration suppressing material or the electric field concentration suppressing member as described above.

  According to the electric field concentration suppressing material of the present invention, by adding a filler having higher conductivity to the resin material or a filler having nonlinear resistance characteristics with respect to the applied electric field in the resin material, It is possible to alleviate the concentration of the electric field, suppress the occurrence of partial discharge, treeing, etc., and maintain excellent insulating characteristics for a long period of time.

  In addition, by producing an electric field concentration suppressing member and an electric device using such an electric field concentration suppressing material, it becomes easy to manufacture the electric field concentration suppressing member and the electric device, while maintaining their insulation characteristics, and a long life. It is also possible to make it.

  The present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic view showing an example of the electric field concentration suppressing material 1 of the present invention. The electric field concentration suppressing material 1 of the present invention is composed of a resin material 2 and a filler 3 dispersed in the resin material 2.

  As the resin material 2, for example, an epoxy resin, an unsaturated polyester resin, a phenol resin, or the like is used. As the epoxy resin, for example, bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol AD type epoxy resin, phenol novolac type epoxy resin, cresol novolak type epoxy resin, and the like can be used.

The filler 3 has conductivity compared to the resin material 2 described above. Since the resistivity ρ of the resin material 2 described above is approximately 10 ¹⁹ to 10 ²⁴ [μΩ · cm], the conductive filler 3 only needs to have a resistivity ρ lower than this. For example, the conductive filler 3 preferably has a resistivity ρ of 100 [μΩ · cm] or less, and more preferably 10 [μΩ · cm] or less.

Examples of such a filler 3 include carbon (10 ² [μΩ · cm]), triiron tetroxide (10 ⁶ [μΩ · cm]), chromium oxide (10 ¹³ [μΩ · cm]), titanium oxide ( 10 ¹⁸ [μΩ · cm]), gold (2.35 [μΩ · cm]), silver (1.59 [μΩ · cm]), copper (1.673 [μΩ · cm]) and iron (9.71). [μΩ · cm]), which may be used alone or in combination of two or more.

  As the filler 3 described above, a commercially available material may be used. For example, CRO 01PB (trade name, manufactured by Kojundo Chemical Laboratory Co., Ltd.) is used as chromium oxide, and TIO 06PB (trade name, manufactured by Kojundo Chemical Laboratory Co., Ltd.). (Trade name, manufactured by Kojundo Chemical Laboratory Co., Ltd.).

  In the electric field concentration suppressing material 1 of the present invention, the conductivity of the filler 3 is higher than that of the resin material 2, so that the concentration is relaxed even when a high electric field is applied. It is possible to suppress the occurrence of typical discharge and treeing and maintain the insulation characteristics for a long time.

  In the present invention, the filler 3 may have a conductivity as described above, or alternatively, may have a nonlinear resistance characteristic with respect to an applied electric field. Having a non-linear resistance characteristic with respect to an applied electric field refers to a substance that does not exhibit conductivity when less than a certain electric field and exhibits certain conductivity when the electric field exceeds a certain electric field.

  By dispersing the filler 3 having such a nonlinear resistance characteristic in the electric field concentration suppressing material 1, only a portion of the filler 3 can have conductivity when a high electric field is applied, The electric field concentration suppressing material 1 as a whole can maintain the insulating characteristics for a long period of time by effectively relaxing the concentration of the electric field and suppressing the occurrence of partial discharge and treeing while maintaining the high insulating characteristics.

The filler 3 having non-linear resistance characteristics is preferable as long as the resistivity ρ is 100 [μΩ · cm] or less when, for example, the electric field strength is 10 ³ [kV · m ⁻¹ ] or more. More preferably, it is 10 [μΩ · cm] or less.

Specific examples of the filler 3 having such nonlinear resistance characteristics include zinc oxide, silicon carbide, and tin oxide. Zinc oxide has an electric field strength of 2 × 10 ³ [kV · m ⁻¹ ] or more and a resistivity ρ of 100 [μΩ · cm] or less, and silicon carbide has an electric field strength of 10 ³ [kV · m ^−1]. ] The resistivity ρ is 100 [μΩ · cm] or less, and tin oxide has an electric field strength of 10 ³ [kV · m ⁻¹ ] or more and a resistivity ρ of 100 [μΩ · cm] or less. The filler 3 having such nonlinear resistance characteristics may be used alone or in combination of two or more.

  As the filler 3 having the nonlinear resistance characteristic described above, a commercially available material may be used. ZNO 01PB (trade name, manufactured by Kojundo Chemical Laboratory Co., Ltd.) is used as zinc oxide, and # 3000 SiC (Shinano) is used as silicon carbide. Electric Smelting Co., Ltd., trade name), SNO 01PB (trade name, manufactured by Kojundo Chemical Laboratory Co., Ltd.) and the like can be cited as tin oxide.

  The filler 3 having conductivity or non-linear resistance characteristics preferably has an average particle diameter of 0.001 μm to 100 μm, and more preferably 0.1 μm to 10 μm. If the average particle size is less than 0.001 μm, the concentration of the electric field is not sufficiently relaxed when a high electric field is applied, and it may be difficult to sufficiently suppress the occurrence of partial discharge. . When the average particle diameter exceeds 100 μm, the insulating properties when viewed as the whole electric field concentration suppressing material 1 are not sufficient, and it may be difficult to form into a film shape.

  The content of the filler 3 in the electric field concentration suppressing material 1 is preferably 5% by volume or more and 33% by volume or less with respect to the entire volume of the electric field concentration suppressing material 1. If the content of the filler 3 is less than 5% by volume, the concentration of the electric field cannot be sufficiently relaxed when a high electric field is applied, and it may be difficult to suppress partial discharge. This is not preferable. Exceeding 33% by volume is not preferable because the insulating properties when viewed as the entire electric field concentration suppressing material 1 may be insufficient.

  In the electric field concentration suppressing material 1 of the present invention, in addition to the resin material 2 and the filler 3 as described above, a curing agent for curing the resin material, a curing accelerator, and a viscosity for adjusting the viscosity as necessary. It is preferable to add a solvent or the like as appropriate.

  In addition, the electric field concentration suppressing material 1 of the present invention may contain an inorganic filler 4 in addition to the resin material 2 and the filler 3 having conductive or nonlinear resistance characteristics, as shown in FIG. .

  When such an inorganic filler 4 is included, the concentration of the electric field when an electric field is applied can be further relaxed, partial discharge can be suppressed, and the electric field concentration suppressing material 1 as a whole can be suppressed. Insulation characteristics can also be improved.

The inorganic filler 4 may be an insulating material such as mica, alumina (Al ₂ O ₃ ), and boron nitride (BN). These may be used alone or in combination of two or more. May be used.

  As the inorganic filler 4, a scale-like inorganic filler having an aspect ratio of 1:10 or more is preferably used. By using the scale-like inorganic filler 4 having such an aspect ratio, the partial discharge of the electric field concentration suppressing material 1 is further suppressed, and the insulation characteristics when viewed as the electric field concentration suppressing material 1 as a whole are improved. Can do.

  In the case where the inorganic filler 4 is contained in the electric field concentration suppressing material 1, it is preferable that the content of the inorganic filler 4 is 60% by volume or more with respect to the entire volume of the electric field concentration suppressing material 1. By making the content of the inorganic filler 4 as described above, the partial discharge suppression of the electric field concentration suppressing material 1 and the insulation characteristics when viewed as the electric field concentration suppressing material 1 as a whole are made sufficient. Can do.

  In addition, when the electric field concentration suppressing material 1 contains the inorganic filler 4, the filler 3 having conductive or non-linear resistance characteristics has a volume obtained by subtracting the volume of the inorganic filler 4 from the entire volume of the electric field concentration suppressing material 1. On the other hand, the content is preferably 5% by volume or more and 33% by volume or less.

  The electric field concentration suppressing material 1 of the present invention described above is obtained by adding a predetermined amount of, for example, a filler 3 having conductivity and a filler 3 having nonlinear resistance characteristics to a resin material 2 and mixing them sufficiently. Can be manufactured. When the inorganic filler 4 is contained, at least one of the conductive filler 3 and the filler 3 having nonlinear resistance characteristics is added to the resin material 2 in a predetermined amount, and the inorganic filler 4 is added. It can be produced by adding a predetermined amount and mixing well.

  The electric field concentration suppressing material 1 obtained in this way can be used by, for example, impregnating and curing a coil as it is. In addition, the electric field concentration suppressing material 1 of the present invention is obtained by adding at least one of a conductive filler 3 and a non-linear filler 3 to the resin material 2, and thus a conventional film is laminated. Applications and members that can be applied are smaller than those of the insulating material having such a structure, and can be applied to various applications and members.

  For example, another resin material, a solvent, or the like may be added to the electric field concentration suppressing material 1 to form a paint and applied to an object to be insulated to form an insulating coating film. In addition, the electric field concentration suppressing material 1 may be thinly stretched and then cured to form a film-like member, and after forming a film-like member in this manner, an adhesive material is applied to at least one main surface to obtain a tape-like member, It may be used by winding and sticking on an object to be insulated. These film-like members and tape-like members may be used alone, or a plurality of them may be laminated.

  Furthermore, the electric field concentration suppressing material 1 may be used as a sheet-like member by impregnating and curing glass cloth or the like. Alternatively, the electric field concentration suppressing material 1 may be injected into a mold and cured to produce a member having a predetermined shape.

  Hereinafter, the electric field concentration suppressing material, the electric field concentration suppressing member, and the electric apparatus of the present invention will be specifically described with reference to examples.

Example 1
Bisphenol A type epoxy resin EP828 (trade name made by Yuka Shell) as a resin material, and chromium oxide CRO 01PB (Co., Ltd.) with an average particle diameter of 1 μm as a filler having conductivity compared to this resin material (Trade name, manufactured by Research Institute) was prepared.

  A bisphenol A-type epoxy resin and chromium oxide were blended and kneaded so that the chromium oxide was 20% by volume with respect to the total volume of the bisphenol A-type epoxy resin and chromium oxide, to obtain an electric field concentration suppressing material.

  As shown in FIGS. 3 and 4, the electric field concentration suppressing material 1 is filled between the glass flat plates 5 a and 5 b with a gap of 10 μm, and the distance between the needle electrode 6 and the planar electrode 7 is 2 mm. A needle-planar electrode was formed by sandwiching. An AC voltage was applied to the needle-planar electrode and the voltage was increased at 2 kV / s to measure the partial discharge generation voltage. The partial discharge generation voltage was measured using a current pulse method.

  For comparison, the same measurement was performed using only bisphenol A type epoxy resin without containing chromium oxide. The results are shown in FIG.

  As shown in FIG. 5, it was recognized that the partial discharge generation voltage was approximately doubled in the case of containing chromium oxide as compared with the case of not containing chromium oxide. In general, partial discharge is generated from the tip portion of the needle electrode. Therefore, by including a conductive filler in the resin material as in the present invention, the electric field at the tip portion of the needle electrode is relaxed and partial discharge is performed. It becomes possible to raise the voltage which generate | occur | produces.

  In this example, chromium oxide was used as the filler having conductivity compared to the resin material. However, this effect is not limited to chromium oxide, and any material having conductivity can be obtained. For example, the same effect can be obtained by using fillers such as carbon, iron trioxide, titanium oxide, gold, silver, copper, and iron.

(Example 2)
Bisphenol A type epoxy resin EP828 (trade name, manufactured by Yuka Shell) as a resin material, zinc oxide ZNO 01PB with an average particle diameter of 1 μm as a filler having a nonlinear resistance characteristic against an applied electric field (high purity chemical research) (Product name).

  Zinc oxide was added to the bisphenol A type epoxy resin and kneaded so that the zinc oxide was 20% by volume with respect to the total volume of the bisphenol A type epoxy resin and zinc oxide, thereby obtaining an electric field concentration suppressing material.

  As shown in FIGS. 3 and 4, the electric field concentration suppressing material 1 is filled between the glass flat plates 5 a and 5 b with a gap of 10 μm, and the distance between the needle electrode 6 and the planar electrode 7 is 2 mm. A needle-planar electrode was formed by sandwiching. An AC voltage was applied to the needle-plane electrode, and the time until dielectric breakdown was measured. The applied voltage was a frequency of 50 Hz and 20 kVrms.

  For comparison, only bisphenol A type epoxy resin, alumina bisphenol A type epoxy resin with an average particle diameter of 1 μm, ALO 01PB (trade name, manufactured by Kojundo Chemical Laboratory Co., Ltd.), 20 volumes with respect to the total volume. What was contained so that it might become% was produced, and the same measurement was performed. The results are shown in FIG.

  As shown in FIG. 6, it was recognized that the time until dielectric breakdown of the material containing zinc oxide was about 50% longer than that containing alumina. Dielectric breakdown occurs when an electrical tree grows from the tip of the needle electrode and short-circuits between the electrodes. By including a filler having non-linear resistance characteristics with respect to the applied electric field in the resin material as in the present invention, the electric field at the tip of the needle electrode is relaxed, and the progress of the tree is suppressed to suppress the breakdown. The time can be greatly extended.

  In this example, zinc oxide was used as a filler having nonlinear resistance characteristics with respect to the applied electric field. However, this effect is not limited to zinc oxide, and nonlinear resistance characteristics with respect to the applied electric field are exhibited. If it has, it will be obtained, and the same effect is acquired also about fillers, such as a silicon carbide and a tin oxide, for example.

(Example 3)
FIG. 7 shows an example of manufacturing the mica plate 8. Hereinafter, a production example of the mica plate 8 will be described.

  First, zinc oxide ZNO 01PB (trade name, manufactured by Kojundo Chemical Laboratory Co., Ltd.) is used as the filler 3 having a nonlinear resistance to the applied electric field, and the aspect ratio is 1: 2000 and the average maximum particle size is 200 μm as the inorganic filler 4. After scaly mica was prepared and both were uniformly dispersed in a solvent, mica paper 9 made of mica and zinc oxide was prepared by finely crushed cloth.

  After the mica paper 9 and the glass cloth 10 were bonded together, the mica plate 8 was obtained by impregnating the epoxy resin 2 and pressing.

  By using scaly mica as the inorganic filler 4, a tree growth suppression effect due to the barrier effect can be obtained. Furthermore, the growth of electric trees between mica can also be suppressed by the effect of zinc oxide as the filler 3 having a non-linear resistance.

  In this example, mica was used as the inorganic filler 4, but the same effect can be obtained by using silica or alumina instead of mica. In addition, even if nanoparticle is used together with or instead of mica, a tree growth suppressing effect can be expected.

Example 4
An example in which the electric field concentration suppressing material of the present invention is used as a paint will be described. Bisphenol A type epoxy resin EP828 (trade name, manufactured by Yuka Shell) as a resin material, acid anhydride curing agent as a curing agent, and zinc oxide ZNO 01PB as a filler having a non-linear resistance against an applied electric field (Corporation) High purity chemical laboratory product name) was kneaded with a planetary kneader to obtain an electric field concentration suppressing material. Zinc oxide was 60% by volume with respect to the total volume.

  Furthermore, a solvent in which toluene and methyl ethyl ketone are blended at a weight ratio of 7: 3 is prepared, and the above-described electric field concentration suppressing material and the solvent are blended so as to have a weight ratio of 8: 2. Kneading for a time gave a paint.

  As shown in FIG. 8, this paint is applied on the insulating layers 12 and 13 formed on both surfaces of the conductor layer 11, and cured at about 180 ° C. for 5 hours to form the coating films 14 and 15, and further the electrodes 16 was provided. A 50 Hz AC voltage was applied between the conductor layer 11 and the electrode 16, and the occurrence of discharge was observed. For comparison, a sample having the same configuration except that no coating film was formed was prepared and measured.

  As a result, a discharge was generated from the electrode at about 40 kV rms when the paint was not applied, whereas a discharge was generated at 75 kV rms when the paint was applied. It has been found that can be greatly improved.

(Example 5)
An example in which the electric field concentration suppressing material of the present invention is a film-like member will be described. High-density polyethylene was prepared as a resin material, and zinc oxide ZNO 01PB (trade name, manufactured by Kojundo Chemical Laboratory Co., Ltd.) was prepared as a filler having a nonlinear resistance to an applied electric field. Zinc oxide was heat-treated at 100 ° C. for 1 hour to remove adsorbed moisture.

  High density polyethylene and zinc oxide were blended so that the zinc oxide was 10% by volume with respect to the entire volume, kneaded at 140 ° C. for 15 minutes, cooled to 30 ° C., and then cut into 3 mm squares. After such kneading, cooling and cutting at 140 ° C. were performed three times, this was hot pressed at 150 ° C. for 10 minutes to produce a film-like electric field concentration suppressing member.

  The film-like electric field concentration suppressing member produced in this way contains a filler having a non-linear resistance to the applied electric field, so that the electric field at the tip of the tree when the tree progresses is relaxed, and the tree progress is effective. Can be suppressed.

(Example 6)
An example of a sheet-like member obtained by impregnating a glass cloth with the electric field concentration suppressing material of the present invention will be described. Bisphenol A type epoxy resin EP828 (trade name, manufactured by Yuka Shell) as a resin material, and zinc oxide ZNO 01PB (trade name, manufactured by Kojundo Chemical Laboratory Co., Ltd.) as a filler having a nonlinear resistance to an applied electric field. Then, it was added to methyl ethyl ketone as a solvent and mixed with a stirrer for 30 minutes to prepare an electric field concentration suppressing material. Zinc oxide was blended so as to be 10% by volume with respect to the entire volume.

  As shown in FIG. 9, a glass cloth 17 was impregnated with this electric field concentration suppressing material and press-cured at 150 ° C. to obtain a sheet-like member.

  Since such a sheet-like member includes a filler having a non-linear resistance to an applied electric field, growth of trees can be suppressed, and mechanical strength can be ensured because glass cloth is impregnated. Also, a plurality of such sheet-like members can be laminated and press-cured to form a laminated plate.

(Example 7)
FIG. 10 shows an example of manufacturing the resin plate 18 using the electric field concentration suppressing material of the present invention. The resin plate 18 is produced as follows, for example.

  Bisphenol A type epoxy resin EP828 (trade name made by Yuka Shell) as a resin material, zinc oxide ZNO 01PB (trade name made by Kojundo Chemical Laboratory Co., Ltd.) as a filler having a nonlinear resistance to an applied electric field Then, the zinc oxide is mixed at 10% by volume with respect to the whole volume, and mixed with a stirrer for 30 minutes to produce an electric field concentration suppressing material.

  As shown in FIG. 10, an electric field concentration suppressing material is poured between the upper mold 19 and the lower mold 20, and the resin plate 18 is produced by heat curing at 150 ° C. The resin plate 18 produced in this manner includes a filler having a non-linear resistance to the applied electric field, and thus exhibits an excellent tree growth suppressing function.

(Example 8)
FIG. 11 is a cross-sectional view illustrating an example of manufacturing a molded coil 21 as an example of an electric device. Such a molded coil 21 can be manufactured as follows, for example.

  First, in the same manner as in Example 7, a resin plate 18 having a concavo-convex portion on one surface is produced. In order to form the concavo-convex portion on one surface of the resin plate 18, for example, as shown in FIG. 10, the concavo-convex portion may be provided in the lower mold 20 that is one mold.

  After the resin plate 18 is affixed to the outside of the square tube 22, the copper wire 23 is wound along the concave portion of the resin plate 18, and these are put into a mold and the epoxy resin 24 is poured and cured.

  According to such a molded coil 21, by effectively suppressing the growth of trees generated from the copper wire 23, a molded coil having a long life can be obtained.

Example 9
FIG. 12 shows an example of manufacturing a stator coil 25 as an example of an electric device. The stator coil 25 is arranged around a rectangular conductor 27 in which a laminated member 26 in which a mica plate produced in the same manner as in the third embodiment and a sheet-like member produced in the same manner as in the fifth embodiment are laminated is laminated. Can be produced.

  In the stator coil 25 manufactured as described above, the laminated member 26 exhibits an excellent tree growth suppressing function, and the thickness of the laminated member 26 can be reduced. It becomes possible.

  In addition, although the example which combined the mica board and the sheet-like member was shown in a present Example, it is not restricted to such a thing, A film-like member, a tape-like member, a mica board, a sheet-like member, etc. which were mentioned above suitably It can be selected and used in combination, or may be used in combination with conventional mica paper or the like.

Sectional drawing which showed the electric field concentration suppression material of this invention Sectional drawing which showed the other electric field concentration suppression material of this invention The top view which showed the apparatus used for the characteristic evaluation of the electric field concentration suppression material of this invention Sectional drawing which showed the apparatus used for the characteristic evaluation of the electric field concentration suppression material of this invention Diagram showing tree generation voltage Diagram showing time to dielectric breakdown Cross-sectional view showing an example of making mica plate Sectional view showing the equipment used to evaluate the properties of the coating Sectional drawing which showed the example of preparation of a sheet-like member Sectional view showing the process of making a resin plate Sectional view showing an example of mold coil fabrication Sectional view showing an example of stator coil production

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electric field concentration suppression material, 2 ... Resin material, 3 ... Filler which has electroconductivity with respect to resin material, or filler which has nonlinear resistance characteristic with respect to applied electric field, 4 ... Inorganic filler

Claims (10)

  An electric field concentration suppressing material, comprising: a composite material in which a filler is dispersed in a resin material, wherein the filler has conductivity as compared with the resin material.   2. The electric field concentration suppression according to claim 1, wherein the conductive filler is made of at least one selected from carbon, iron tetroxide, chromium oxide, titanium oxide, gold, silver, copper, and iron. material.   An electric field concentration-suppressing material, which is a composite material in which a filler is dispersed in a resin material, wherein the filler has nonlinear resistance characteristics with respect to an applied electric field.   4. The electric field concentration suppressing material according to claim 3, wherein the filler having nonlinear resistance characteristics with respect to the applied electric field is at least one selected from zinc oxide, silicon carbide, and tin oxide.   The electric field concentration-suppressing material according to any one of claims 1 to 4, further comprising a scale-like inorganic filler having an aspect ratio of 1:10 or more.   An electric field concentration suppressing member comprising the electric field concentration suppressing material according to claim 1 in a paint form.   The electric field concentration suppressing member according to claim 1, wherein the electric field concentration suppressing material according to claim 1 is formed in a film shape or a tape shape.   An electric field concentration suppressing member obtained by impregnating a glass cloth with the electric field concentration suppressing material according to any one of claims 1 to 5.   6. An electric field concentration suppressing member, wherein the electric field concentration suppressing material according to claim 1 is placed in a mold and cured.   An electric device comprising the electric field concentration suppressing material or the electric field concentration suppressing member according to any one of claims 1 to 9.

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