JP2013055279A - Stationary induction apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the novel winding of a stationary induction apparatus in which displacement of the winding due to vibration such an earthquake can be prevented while reducing the manufacturing cost.SOLUTION: In the stationary induction apparatus having a winding 100 of such a structure that coils 30, each consisting of an insulation coated wire 40, are stacked in a multistage on the outer periphery of an insulation tube 10 with a linear spacer 20 therebetween, and an inter-coil spacer 50 extending from each linear spacer 20 is sandwiched between respective coils 30, the linear spacer 20 and the inter-coil spacer 50 are composed of a craft material, and a low dielectric constant layer 52 composed of an aramid material is provided on the coil contact surface of the linear spacer 20 and the inter-coil spacer 50.

Description

  The present invention relates to a static induction electric device such as a transformer or a reactor, and particularly to a structure of a winding constituting an electric body.

  Generally, a conventional static induction electric appliance has a structure in which an electric main body composed of an iron core and a winding is accommodated in a tank, and the tank is filled with an insulating cooling medium such as insulating oil. The winding of this electric body is a multi-layered structure in which a plurality of coils are interposed through spacers made of an insulator. When a press board made of craft material is used as the spacer, a minute gap between the coils and the spacers is used. Dielectric breakdown may occur in the oil gap.

  This is because the dielectric constant of the insulating oil, which is an insulating cooling medium, is lower than the dielectric constant of the kraft material that constitutes the spacer, so that the electric field strength of the fine oil gap portion becomes high and dielectric breakdown occurs from the fine oil gap portion. It is considered a thing. For this reason, in Patent Document 1 below, the oil gap portion is filled between the coil and the spacer by using a porous polymer material that is a dielectric material having a lower dielectric constant and softer than the craft material. A method for relaxing the electric field outside the winding has been proposed.

  Also, in Patent Document 2 below, aramid material having a low dielectric constant is used for all of the insulating paper, linear spacers, and inter-coil spacers of the winding, and the dielectric strength is reduced by reducing the difference in dielectric constant from the insulating oil. A way to improve it has been proposed.

JP-A-5-226166 JP-A-6-77061

  However, in the configuration of Patent Document 1, since a soft material such as a porous polymer material is used, not only the mechanical strength is reduced, but also the winding polymer force is deteriorated due to the winding tightening force and aging deterioration. Due to the decrease in elasticity, it is expected that the displacement of the windings will occur due to vibration such as an earthquake.

  Moreover, in the method of patent document 2, since the aramid material is used for all the insulating paper of winding, a linear spacer, and the spacer between coils, cost will become high compared with the case where these are comprised with a craft material. There is a problem.

  Therefore, the present invention has been devised to solve these problems, and the object of the present invention is to provide a novel device that can prevent the positional deviation of the winding due to vibration such as an earthquake and can reduce the manufacturing cost. A winding for a static induction machine is provided.

  In order to solve the above-mentioned problems, the present invention is configured by stacking coils made of insulation-coated wires in multiple stages with linear spacers on the outer periphery of an insulating cylinder, and inter-coil spacers extending from the linear spacers between the coils. A static induction electric machine having a winding structure, wherein the inter-coil spacer is composed of a core material made of a craft material and a low dielectric constant layer made of an aramid material laminated on the coil contact surface of the core material. This is a static induction electric device characterized by that.

  According to such a configuration, since the difference in dielectric constant between the surface of the inter-coil spacer and the insulating oil is reduced and the dielectric strength is improved, the insulation in the minute oil gap portion generated between the inter-coil spacer and the coil is increased. Destruction can be prevented. As a result, it is not necessary to use a soft material such as a porous polymer material for filling the minute oil gap portion, so that it is possible to prevent a position shift of the winding due to vibration such as an earthquake. In addition, since it has a structure in which a low dielectric constant layer made of aramid material (fully aromatic polyamide fiber), which is more expensive than craft material, is provided on the coil contact surface of the inter-coil spacer, all of these spacers are made of aramid material. The manufacturing cost can be kept low as compared with the case of configuring.

  According to a second invention, in the first invention, the linear spacer is made of a craft material, and a low dielectric constant layer made of an aramid material is provided on a coil contact surface of the linear spacer. It is.

  According to such a configuration, since the difference in dielectric constant between the surface of the linear spacer and the insulating oil is reduced and the dielectric strength is improved, the dielectric breakdown of the minute oil gap portion generated between the linear spacer and the coil is prevented. Can be prevented. As a result, the same effect as the first invention can be obtained.

  According to the present invention, since the difference in dielectric constant between the spacer and the insulating oil is reduced and the dielectric strength is improved, it is possible to prevent dielectric breakdown in the minute oil gap portion generated between the spacer and the coil. Accordingly, it is not necessary to provide a soft material such as a porous polymer material between the coil and the spacer, so that it is possible to prevent a winding position shift due to vibration such as an earthquake. Moreover, since the aramid material more expensive than the craft material is used only for the coil contact surfaces of the linear spacer and the inter-coil spacer, the manufacturing cost can be kept low.

1 is a partially broken perspective view showing an embodiment of a winding 100 of a static induction electric machine according to the present invention. It is the elements on larger scale which show the A section in FIG. It is the elements on larger scale which show the A section in FIG. It is the elements on larger scale which show the A section in FIG.

  Next, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an embodiment of a winding 100 of a static induction electric machine according to the present invention. In the figure, reference numeral 10 denotes an insulating cylinder 10 into which an iron core (not shown) is inserted. A plurality of linear spacers 20 are provided on the outer peripheral surface of the insulating cylinder 10 at predetermined intervals in the circumferential direction. . The linear spacer 20 is formed of an insulator such as craft material, and is formed in a strip shape so as to extend along the axial direction of the insulating cylinder 10.

  Around the insulating cylinder 10, a plurality of coils 30 are provided so as to be stacked in multiple upper and lower stages via these linear spacers 20. As shown in FIG. 2, the coil 30 is configured by winding a rectangular insulation covered electric wire (copper wire) 40 a plurality of times so as to be laminated in the radial direction of the insulating cylinder 10. As shown in FIG. 3, the flat insulating coated electric wire 40 has a configuration in which an insulating layer 42 made of insulating paper (craft paper) is provided outside a rectangular copper wire 41 in cross section.

  As shown in FIGS. 1 and 2, a plurality of strip-like inter-coil spacers 50 are provided between the coils 30 and 30 at a predetermined interval along the circumferential direction. Each of the inter-coil spacers 50, 50... Is connected at one end to the linear spacer 20, and a plurality of inter-coil spacers 50, 50. As shown in FIG. 3, the inter-coil spacer 50 has a sandwich structure in which low dielectric constant layers 52 and 52 made of an aramid material are laminated on the surface (coil contact surface) of a core material 51 made of a craft material.

  Further, as shown in FIG. 3, a low dielectric constant layer 21 made of an aramid material is also provided on the outer surface (coil contact surface) of the linear spacer 20 in contact with the inner peripheral surface of each of the coils 30, 30. . Here, as a method of creating the winding 100 of the static induction electric machine, for example, first, a plurality of linear spacers 20, 20... The inter-coil spacers 50 are attached to the linear spacers 20, 20. Thereafter, the rectangular insulating coated electric wire 40 is wound around the outer peripheral surface of the insulating cylinder 10 a plurality of times so as to be in contact with the lowermost inter-coil spacer 50 to constitute the coil 30. Then, the coils 30 can be sequentially formed on the other inter-coil spacers 50 on the coil 30 and stacked in a plurality of stages according to the winding specifications.

  And in the coil | winding 100 of the static induction electric machine which concerns on this invention which comprised such a structure, the insulation cylinder 10 and the coils 30, 30 ... are carried out by the linear spacers 20, 20 ... provided in the outer surface of the insulation cylinder 10. FIG. A certain gap is formed between the two. Further, a constant gap is also formed between the coils 30 by the inter-coil spacers 50 extending in the radial direction from the linear spacers 20. Thereby, since the insulating oil which is the surrounding insulating cooling medium can easily flow into these gaps, effective cooling is realized. Further, since a certain insulation distance is secured between the coils 30 by the inter-coil spacers 50, 50..., Insulation breakdown between the coils 30 can be prevented.

  In the present invention, the inter-coil spacer 50 in contact with the coil 30 has a structure in which a low dielectric constant layer 52 made of an aramid material is provided on the surface (coil contact surface) of a core material 51 made of craft material. The difference in dielectric constant between the surface of the inter-coil spacer 50 and the insulating oil is reduced, and the dielectric strength is improved. As a result, it is possible to prevent dielectric breakdown in the minute oil gap portion S formed between the coil 30 and the inter-coil spacer 50 as shown in FIG. Similarly, since the low dielectric constant layer 21 made of an aramid material is also provided on the outer surface (coil contact surface) of the linear spacer 20 in contact with the inner peripheral surface of the coil 30, the inner peripheral surface of the coil 30 and the linear spacer 20 are provided. It is possible to prevent dielectric breakdown between the two (particularly the corner).

  Table 1 below shows the dielectric constants of various insulators in mineral oil as examples of the dielectric constant of insulators in insulating oil. The mineral oil generally used as the insulating oil for transformers has a relative dielectric constant of 2.2, whereas the press board is 4.7, which is 2.14 times that of the mineral oil. The craft material is 3.5, which is 1.59 times that of mineral oil. On the other hand, the aramid material (fully aromatic polyamide fiber) is 2.47, which is 1.12 times that of mineral oil.

  As described above, since the aramid material has a lower dielectric constant than that of a press board or craft material, if the low dielectric constant layers 52 and 21 made of the aramid material are laminated on the coil contact surface of the spacer in contact with the coil 30, FIG. As shown in FIG. 5, the electric field strength of the wedge-shaped minute oil gap portion S is also reduced, and the insulation performance is greatly improved.

  As a result, it is not necessary to use a soft material such as a porous polymer material between the coil 30 and the inter-coil spacer 50 in order to fill the minute oil gap portion S, and the position of the winding due to vibration such as an earthquake. Misalignment is less likely to occur.

  In addition, since the low dielectric constant layers 21 and 52 made of an aramid material that is generally more expensive than a craft material are provided only on the coil contact surfaces of the linear spacer 20 and the inter-coil spacer 50, all of the spacers 20 and 50 are provided. Compared with the case where is made of an aramid material, the manufacturing cost can be reduced.

DESCRIPTION OF SYMBOLS 100 ... Winding of static induction machine 10 ... Insulating cylinder 20 ... Linear spacer 21 ... Low dielectric constant layer (linear spacer side)
30 ... Coil 40 ... Insulated coated electric wire 50 ... Inter-coil spacer 51 ... Core material 52 ... Low dielectric constant layer (inter-coil spacer side)
S ... Minute oil gap

Claims (2)

This is a static induction electric device having a coil having a structure in which a coil made of an insulation-coated electric wire is stacked in multiple stages with linear spacers on the outer periphery of an insulating cylinder, and inter-coil spacers extending from the linear spacers are sandwiched between the coils. And
A winding for a static induction electric appliance, wherein the inter-coil spacer is composed of a core material made of a craft material and a low dielectric constant layer made of an aramid material laminated on a coil contact surface of the core material.   The static induction device according to claim 1, wherein the linear spacer is made of a craft material, and a low dielectric constant layer made of an aramid material is provided on a coil contact surface of the linear spacer.

Images