JPH0543516U - High voltage transformer - Google Patents

Abstract

(57) [Abstract] [Purpose] Voids that occur in the molding bobbin and the resin that is filled or impregnated into the molding bobbin and peeling between the molding bobbin and the resin are less likely to occur, and insulation resistance is improved. [Structure] A molding bobbin (3) is arranged between the primary winding (2) and the secondary winding (6), and a filling or impregnating material is provided between the molding bobbin (3) and the primary winding (2). In the high-pressure transformer provided, the resin (4) of the filling or impregnating material and the resin of the material of the molding bobbin (3) are the same, and the space (5) is formed in the molding bobbin (3).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a high voltage transformer having improved insulation resistance.

[0002]

[Prior Art]

 High-voltage transformers such as the so-called dry high-voltage corona-free transformers use film-like insulating paper made of mica, non-woven fabric, etc. as a measure for insulation between the primary and secondary windings. Alternatively, a molding bobbin made of nylon, FRR, or the like is used. The following measures are taken.

[0003]

[Problems to be solved by the device]

 However, in the former case, even if the impregnating material such as epoxy resin is impregnated between the multi-layered insulating papers in the air, voids and non-impregnated layers are inevitably generated, which is not sufficient for corona-free.

Also in the latter, since the molding bobbin and the filler are usually different materials, the adhesion between them is poor, and the molding bobbin and the filler are separated from each other or voids are formed in the molding bobbin. However, even with this method, there was a problem that the reliability for high pressure was not sufficient.

The present invention has been proposed in view of the above, and its purpose is to provide a high-voltage transformer in which voids and peeling are less likely to occur and insulation resistance, that is, reliability is improved. To provide.

[0006]

[Means for Solving the Problems]

 This invention relates to a high-voltage transformer in which a molding bobbin 3 is arranged between a primary winding 2 and a secondary winding 6, and a filling or impregnating material is provided between the molding bobbin 3 and the primary winding 2. The resin 4 of the filling or impregnating material and the resin of the material of the molding bobbin 3 are made the same, and the space 5 is formed in the molding bobbin 3 to achieve the above object.

[0007]

[Action]

 In this invention, since the resin 4 of the material of the molding bobbin 3 and the resin of the impregnating material or the filling material between the molding bobbin 3 and the primary winding 2 which are interposed between the windings as described above are the same resin, It has good compatibility with each other, improved adhesion, reliable impregnation and filling, and voids and peeling on the surface of the molding bobbin are less likely to occur.

Further, the forming bobbin 3 is provided with a space so that the impregnating material and the filling material can sufficiently penetrate into the inside of the forming bobbin 3 and the primary winding 2 side to improve the impregnating property and the filling property. Together with this, we are trying to prevent voids and peeling.

[0009]

【Example】

 1 to 3 show a first embodiment of the present invention, FIG. 1 is a sectional view showing the internal structure of the present invention, and FIGS. 2 and 3 are perspective views of a molding bobbin. In the drawings, reference numeral 1 is a cylindrical coil bobbin, and the primary winding 2 is wound around the outer circumference of the body. Further, on the outer side thereof, forming bobbins 3 having a U-shaped cross section and having a two-divided structure are arranged to face each other.

In this example, the pair of molding bobbins 3 are opposed to each other with a space therebetween so that the resin 4 as a filling or impregnating material is sufficiently filled in the molding bobbin 3 or the outer peripheral portion of the primary winding 2. A space 5 is formed. As the space 5, as shown in FIG. 3, a window 3a having a proper shape and a large size may be formed in the molding bobbin 3 itself, and this may be used as the space. Further, 6 is a secondary winding 6 wound around the outer periphery of the molding bobbin 3, and the transformer main body is constituted by this, but it may be wrapped with resin 7 and molded if necessary.

In this case, the resin 4 to be filled or impregnated inside and the molding bobbin 3 are made of the same resin so that they are well compatible with each other and voids and peeling are less likely to occur. As the type of resin, for example, epoxy resin is used. The forming bobbin 3 is manufactured by vacuum filling and pressure heating curing, is arranged between the primary winding 2 and the secondary winding 6, and is used as a bobbin for the secondary winding 6. When the outermost periphery is molded with the resin 7, the same resin as the resin 4 inside is also used.

4 and 5 show an example in which the present invention is applied to a transformer having a circular cross section, and the basic structure is the same as that of the first embodiment described above. Therefore, the same members are designated by the same reference numerals and the description thereof will be omitted.

FIGS. 6 and 7 show another example of the form of the bobbins 3A and 3B with flanges, respectively. If necessary, the form bobbins 3A and 3B may be provided in the examples shown in FIGS. You may use. Further, it goes without saying that the present invention can be applied to bobbins of other shapes.

[0014]

[Effect of the device]

 As described above, according to the present invention, since the material of the molding bobbin 3 and the resin 4 to be filled or impregnated into the molding bobbin 3 are the same resin, the adhesion between them is good and a void is generated in the resin 4. Further, there is an advantage that peeling is less likely to occur on the molding bobbin 3, insulation resistance is improved, and reliability and safety are improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is a perspective view of a molding bobbin used in the above.

FIG. 3 is another example of the same.

FIG. 4 is a sectional view of a second embodiment of the present invention.

FIG. 5 is a perspective view of a molding bobbin used in the same.

FIG. 6 is another example of a forming bobbin.

FIG. 7 shows still another example of the forming bobbin.

[Explanation of symbols]

 1 bobbin 2 primary winding 3 molded bobbin 4 resin 5 space part 6 secondary winding 7 resin

Claims (1)

[Scope of utility model registration request] 1. A molding bobbin (3) is arranged between the primary winding (2) and the secondary winding (6), and filling or impregnating between the molding bobbin (3) and the primary winding (2). In the high-pressure transformer provided with the material, the resin (4) of the filling or impregnating material and the resin of the material of the molding bobbin (3) are made the same, and the space portion (5) is formed in the molding bobbin (3). A high-voltage transformer characterized by that.