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Molded transformer

A transformer and molding technology, applied in the direction of transformers, fixed transformers, transformer/inductor components, etc., can solve the problems of tracking insulation, breakdown, electric field concentration increase, etc., and achieve the effect of improving reliability

Inactive Publication Date: 2017-05-10
HITACHI IND EQUIP SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the rubber part of the insulating spacer is reduced in corrosion resistance due to the adhesion of impurities such as dust, water, and salt, which causes an increase in electric field concentration.
As a result, the insulation resistance decreases due to the progress of the corrosion of the rubber part, and there is a possibility that the tracking phenomenon progresses along with the insulation block and insulation breakdown occurs

Method used

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  • Molded transformer
  • Molded transformer
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Hereinafter, the first embodiment will be described with reference to the drawings. figure 1 is a front view of the molded transformer 100 of Embodiment 1, figure 2 is a side view of the molded transformer 100 .

[0034] In the molded transformer 100 of the first embodiment, the cylindrical primary coil 1 and the secondary coil 2 are supported by a metal frame 20 via a plurality of insulating blocks 5 and metal fittings 7 . Among them, the frame 20 has a frame 20 a located at the lower part of the molded transformer 100 and a frame 20 b located at the upper part of the molded transformer 100 . Hereinafter, when calling without distinguishing the frame 20a and the frame 20b, it describes as "the frame 20." In addition, in this specification, the insulating block 5, the metal fitting 7, and the frame 20 are called a support structure part.

[0035] image 3 The coils (primary coil 1 and secondary coil 2 ) in the molded transformer 100 and the cross section of the sup...

Embodiment 2

[0043] Next, for embodiment 2 of the present invention, use Figure 6 , Figure 7 Be explained. The structure of the molded transformer of the second embodiment is the same as that of the molded transformer of the first embodiment except for the structure of the supporting structure. Therefore, the following description will focus on the support structure part. Figure 6 It is a cross-sectional view showing one support structure portion located at the lower end portions of the primary coil 1 and the secondary coil 2 of the molded transformer of the second embodiment. In the supporting structure part of the second embodiment, on the basis of the structure described in the first embodiment, a support structure having an area larger than the bottom area of ​​the insulating block part 5 and the metal part 7 is arranged at the lower part of the insulating block part 5. The flat plate is a wide insulating board 8 . In addition, as in the first embodiment, the supporting structur...

Embodiment 3

[0056] Next, use Figure 9 , Figure 10 A third embodiment of the present invention will be described. The structure of the molded transformer of the third embodiment is the same as that of the molded transformer of the first embodiment except for the structure of the supporting structure. Figure 9 In the molded transformer of Example 3, cross sections of coils (primary coil 1, secondary coil 2) and supporting structures (insulating block 5, metal fitting 7, frame 20) supporting them are shown. Figure 10 It is a perspective view of a support structure part.

[0057] In the molded transformer of the first embodiment, the buffer 4 is disposed between the coil and the insulating block 5 . On the other hand, in the molded transformer of Example 3, the structure in which the buffer 4 is arrange|positioned below the insulating block 5, and the primary coil 1 and the secondary coil 2 are directly supported by the insulating block 5 is employ|adopted. In other respects, the same...

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PUM

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Abstract

A molded transformer according to one embodiment of the present invention has a primary coil and a secondary coil that is disposed in a state in which a prescribed space is provided on the inside of the primary coil, and the molded transformer has a configuration in which the primary and secondary coils are supported by a plurality of support structures. The plurality of support structures are provided between the ends of the primary and secondary coils and a frame, and each support structure is formed by an insulator block and a wide insulating plate that has a wider surface area than the bottom surface area of the insulator block. A top surface of the insulator block is abutted to the ends of the primary and secondary coils, and the wide insulating plate is disposed between the bottom surface of the insulator block and the frame.

Description

technical field [0001] This invention relates to molded transformers. Background technique [0002] As a document disclosing the background art of this technical field, there is, for example, Patent Document 1 shown below. Patent Document 1 discloses that resin-molded cylindrical high-voltage windings (primary coils) and low-voltage windings (secondary coils) are insulated through elastic rubber spacers and cured spacer resin parts. Spacer, molded transformer of the structure fixed to the frame of the transformer. [0003] Generally speaking, molded transformers are set to operate in switchgear rooms equipped so that the outside atmosphere cannot directly enter. However, in recent years, the range of application of molded transformers has been expected to expand. Therefore, in the future, there is a possibility that the molded transformer will be installed in a special environment with a lot of dust, water, salt, etc., which has not been considered as an installation plac...

Claims

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Application Information

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IPC IPC(8): H01F27/32H01F27/30H01F30/00H01F30/12
CPCH01F27/306H01F27/324H01F27/327H01F30/12H01F2027/328
Inventor 铃木敦竹内正树小林金也
Owner HITACHI IND EQUIP SYST CO LTD