JP2011159500A - Insulated wire of winding for insulated oil-filled stationary induction electrical apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an insulated wire which has high heat resistance and high dielectric strength that are not achieved conventionally as insulated oil-filled stationary induction electrical apparatus windings, and which is superior in cost balance. <P>SOLUTION: In the insulated wire of a winding for insulated oil-filled stationary induction electrical apparatus, as insulated covering material used for the insulated wire, amine-added covering paper insulated covering is wound around in an orbital form on a conductor, and furthermore on the wound around amine-added paper insulated covering, craft paper insulated covering is wound around in an orbital form. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an insulated wire of a winding for a stationary induction appliance containing insulating oil.

  An outline of a general induction transformer including insulating oil such as a transformer for electric power or a reactor is shown in FIG. The static induction electric machine shown here is composed of an iron core 110, a winding 120, and an insulating oil 130 as main elements. An electric wire (hereinafter referred to as an insulated wire 100) whose surface is coated with an insulating coating is used for the winding 120 therein. FIG. 7 shows a cross-sectional schematic perspective view of part A of the winding 120. As can be seen from FIG. 7, the appearance of the winding 120 is that the insulated wire 100 is wound in a disk shape in the radial direction, and the insulated wires 100 in the disk shape are stacked in multiple layers in the vertical direction. appear. Since the actual winding structure is more complicated, details are omitted.

  FIG. 8 shows an enlargement of the portion B in FIG. In this insulated wire 100, an oil-impregnated insulator 5 is wound around the outer periphery of the conductor 2 in a circular shape with the conductor 2 as a core wire.

  For example, in order to manufacture the winding 120 of the static induction appliance at a low cost, it is conceivable to use a kraft paper insulation coating as the oil immersion insulator 5 of the insulated wire 100.

  However, kraft paper insulation coating generally has a heat resistance of about 95 ° C., and it cannot be denied that there is a risk of disaster prevention due to the temperature rise in the static induction appliance. As a countermeasure, as in Patent Document 1, a layer formed by alternately winding kraft insulating paper and insulating paper made of heat-resistant low dielectric constant plastic (heat resistance: 140 ° C.) around the conductor outer periphery is the same material. It is considered that a plurality of layers are provided so as not to be covered with each other.

  Moreover, what uses the amine addition paper insulation coating (heat resistance: about 105 degreeC) etc. excellent in heat resistance as the oil-immersed insulator 5 is also considered.

JP 7-320546 A

  However, as in Patent Document 1, in the configuration in which the heat-resistant low dielectric constant plastic material and the kraft paper insulation coating are alternately wound, the portions having a heat resistance of 140 ° C. and the portions having a temperature of 95 ° C. are alternately provided to the conductor of the insulated wire 100. Although the average heat resistance is higher than that using only the kraft paper insulation coating, the entire insulation coating does not have a heat resistance of 140 ° C.

  Further, since the dielectric constant using only the amine-added paper insulating coating is higher in physical properties than the one using only the kraft paper insulating coating, the ratio of the dielectric constant between the oil and the insulating coating increases.

  In general, if the voltage applied to a part is the same, the voltage ratio is determined by the reciprocal of the dielectric constant in the part. That is, the smaller the dielectric constant, the greater the voltage applied. In other words, the one using only the amine-added paper insulation coating has a higher voltage on the oil side than the one using only the kraft paper insulation coating, which increases the risk of partial discharge and dielectric breakdown. .

  Further, if only the amine-added insulating coating is used as the insulating coating material, the insulating coating is more expensive than when the kraft paper insulating coating is used, so that the cost of the insulated wire 100 is increased, and as a result, the winding 120 is also expensive. For this reason, there has been a demand for an insulated wire used for a coil for a stationary induction appliance containing insulating oil, which has excellent heat resistance, dielectric strength and cost balance.

  In view of these points, the present invention has an object to provide an insulated wire that is used for a coil for a stationary induction appliance containing insulating oil, which has high heat resistance and dielectric strength, and is excellent in cost balance.

  In order to solve these problems, as an insulating coating material used for the insulated wire in the insulated wire with the insulation oil containing insulating oil, an amine-added paper insulating coating is wound around the conductor in a circular shape, and The kraft paper insulation coating is wound around the wound amine-added paper insulation coating.

  According to the present invention, as the insulating coating material used for the insulated wire of the insulating oil-containing static induction winding, the amine-added paper insulating coating excellent in heat resistance is disposed in contact with the conductor as the heating element. Heat resistance is improved.

  In addition, the relative dielectric constant from the amine-added paper insulation coating to the kraft paper insulation coating and insulation oil of the insulated wire is higher than that of the insulated wire using only the amine-added paper insulation coating and the amine-added paper insulation coating and the insulation oil. With the kraft paper insulation coating in between, the change in the dielectric constant becomes gentle, the electric field concentration on the insulating oil side is relaxed, and the dielectric strength is improved.

  Furthermore, since the amount of the amine-added paper insulation coating used is small compared to an insulated wire using only the amine-added paper insulation coating as the insulation coating material, a low-cost insulated wire can be provided.

It is an insulation coating winding 1st step figure. It is an insulated wire of the present invention. It is a multilayer structure figure of insulation coating. It is winding explanatory drawing of insulation coating. It is an Example of this invention to the coil | winding for static induction appliances. It is a structure schematic diagram of a general static induction machine containing insulating oil. It is the A section cross-sectional schematic perspective view of FIG. It is the B section enlarged view of FIG.

  Examples of the present invention will be described. In addition, about the same part as a prior art, the same code | symbol is attached | subjected and description is abbreviate | omitted. First, in order to explain the structure of the insulated wire 1, how to wind the amine-added paper insulation coating 3 excellent in heat resistance around the conductor 2 will be described with reference to FIG. First, the amine-added paper insulation coating 3 is wound a plurality of times with the conductor 2 as a core wire. When the amine-added paper insulation coating 3 is wound around the conductor 2, it is wound as close as possible so that no wrinkles, twists or voids are formed. And it winds also to the longitudinal direction (right direction of FIG. 4) of the conductor 2. As shown in FIG.

  As shown in FIG. 4, the winding proceeds in the right direction while wrapping the amine-added paper insulating coating 3 so that the insulating coating width D> the lapping margin R. In this way, when the amine-added paper insulation coating 3 is wound around the conductor 2 by the required length, a first-stage insulated wire as shown in FIG. 1 is obtained. The number of windings of the insulating coating and the length of the insulated wire are appropriately adjusted according to the product specifications at that time.

  Next, how to wind the kraft paper insulation coating 4 is wound on the amine-added paper insulation coating 3 wound in the same manner as described above. When the winding is finished, it becomes as shown in FIG. 2, and its cross section becomes as shown in FIG. That is, a structure in which a plurality of layers of the amine-added paper insulating coating 3 and the kraft paper insulating coating 4 are wound around the conductor 2 is obtained. Therefore, since the amine-added paper insulation coating 3 having excellent heat resistance is disposed on the conductor 2 side and the kraft paper insulation coating 4 is disposed on the outside thereof, the conductor 2 is compared with the case where only the kraft paper insulation coating is used. The heat resistance of the part in contact with the temperature is improved from 95 ° C. to 105 ° C. That is, the amine-added paper insulation coating 3 reduces the heat transmitted to the kraft paper insulation coating 4 by its own thermal resistance, and improves the heat resistance.

  In both the amine-added paper insulating coating 3 and the kraft paper insulating coating 4 described above, the wrap margin R at the time of winding is adjusted to approximately ½ width of the insulating coating width D. When the insulated wire 1 is used as a winding, the wrap margin R may be adjusted as appropriate as long as the insulation coating of the lower layer portion is not exposed due to bending. In addition, although the winding of the insulating coating is in the right direction, this may be left or right depending on the situation.

  Further, when the prices of the insulating coatings are compared in the same amount, the relationship of a >> b is established, where the price of the amine-added paper insulating coating is a and the price of the kraft paper insulating coating is b. When this is applied to the present invention, for example, when the thickness of each material is halved with respect to the required thickness of insulating paper, the price becomes (a / 2 + b / 2). That is, a> (a / 2 + b / 2)> b, and the cost can be reduced compared to when only the amine-added paper insulation coating is used.

  Then, when the winding 121 shown in FIG. 5 is constituted by the insulated wire 1 of the present invention, the insulating oil 130 penetrates into each of the amine-added paper insulating coating 3 and the kraft paper insulating coating 4, and from the amine-added paper insulating coating 3 The relative dielectric constant up to the kraft paper insulation coating 4 and the insulation oil 130 changes gently.

For example, when it is desired to further improve the disaster prevention property, silicone oil (kinematic viscosity: 20 to 50 mm ² / s (at 25 ° C.), 2.5 when the relative dielectric constant is 80 ° C.) is used as the insulating oil 130. preferable. When the ambient temperature is 80 ° C., the silicone oil penetrates into the amine-added paper insulating coating 3 and the kraft paper insulating coating 4, so that the relative dielectric constant of the amine-added paper insulating coating 3 is 3.9. Kraft paper The relative dielectric constant of the insulating coating 4 is 3.7.

  The table below shows examples of physical quantities when silicone oil is used.

  That is, when silicone oil is used as the insulating oil, the ratio of the dielectric constant of the amine-added paper insulating coating 3 and the kraft paper insulating coating 4 is 1.05, and the ratio of the dielectric constant of the kraft paper insulating coating 4 and the silicone oil is 1.48. On the other hand, in the case of an insulated wire using only a conventional amine-added paper insulation coating, the dielectric constant ratio with the silicone oil is 1.56. That is, the ratio of the dielectric constant to the silicone oil is 1.56 to 1.48, and the electric field concentration is relaxed by the dielectric matching, so that the dielectric strength is improved.

  Further, for example, when it is desired to configure at a lower cost, it is preferable to use mineral oil (2.2 when the relative dielectric constant is 80 ° C.) as the insulating oil 130. When the ambient temperature is 80 ° C., the mineral oil penetrates into the amine-added paper insulation coating 3 and the kraft paper insulation coating 4, so that the relative dielectric constant of the amine-added paper insulation coating 3 is 3.7. The relative dielectric constant of the coating 4 is 3.5.

  The table below shows examples of physical quantities when mineral oil is used.

  When mineral oil is used as the insulating oil, the dielectric constant ratio between the amine-added paper insulating coating 3 and the kraft paper insulating coating 4 is 1.06, and the dielectric constant ratio between the kraft paper insulating coating 4 and the mineral oil is 1.59. Become. On the other hand, in the case of an insulated wire using only a conventional amine-added paper insulation coating, the value is 1.68. That is, the ratio of the dielectric constant with mineral oil is 1.68 to 1.59, and the electric field concentration is relaxed by dielectric matching, and the dielectric strength is improved.

  The kraft paper insulation coating used in the present invention is JIS C2304 coil insulation paper P50 or P75, and is an amine-added paper insulation coating, trade name Thermo ZA50 or Thermo ZA75 manufactured by Shinyodogawa Paper. Other than these insulating coatings, the same effect can be expected if the specifications are the same.

  In the present embodiment, a flat insulated electric wire has been described as an example. However, as long as an insulating coating is wound around a conductor, the same effect can be expected without being particular about the shape of the electric wire.

  Furthermore, in the present invention, silicone oil and mineral oil are taken as examples of the insulating oil. However, if the change in the dielectric constant from the insulating coating of the insulated wire to the insulating oil is equal to or gentler than that of the present invention, the type of oil is used. Even if you don't care, you can expect the same effect.

1 Insulated wire 2 Conductor 3 Amine-added paper insulation coating 4 Kraft paper insulation coating

Claims (1)

In the insulated wire of the insulation induction coil with insulating oil, as the insulation coating material used for the insulated wire, the conductor is coated with an amine-added paper insulation coating around the conductor. An insulated wire with a kraft paper insulation coating wound around it.

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