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Special open roll core and low-impedance transformer for electrified railways and production method thereof

A technology of electrified railways and rolled iron cores, which is applied in the field of transformers, can solve the problems of increasing transformer reactive power loss, increasing impedance voltage, affecting voltage quality, etc., and achieves the effects of improving power quality, reducing voltage drop, and high production efficiency

Active Publication Date: 2015-09-09
CHINA CREC RAILWAY ELECTRIFICATION BUREAU GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The higher impedance voltage percentage leads to excessive voltage loss, which greatly increases the reactive power loss of the transformer, and the increase of impedance voltage increases the fluctuation of secondary voltage with load changes, which affects the voltage quality and causes waste in the power system.

Method used

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  • Special open roll core and low-impedance transformer for electrified railways and production method thereof
  • Special open roll core and low-impedance transformer for electrified railways and production method thereof
  • Special open roll core and low-impedance transformer for electrified railways and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] See figure 1 and figure 2 Shown: an open wound iron core and a low-impedance transformer for electrified railways, including a box body 10 . The box body 10 is provided with an iron core 20 and a winding 30 sleeved on the iron core 20 .

[0028] Further speaking, the iron core 20 is a single-phase open-wound iron core, and the box 10 is filled with an insulating medium 40 . And, the impedance voltage percentage of the open-roll iron core and the low-impedance transformer dedicated to the electrified railway is 3-4%. More specifically, the cross section of the iron core 20 is circular, and the iron core 20 is formed by winding a silicon steel sheet 21 . Moreover, one side of the silicon steel sheets 21 is provided with fractures 22 , and the fractures 22 are staggered from each other. That is, the single-phase open wound core 20 is trimmed by an automatic open annular coil core numerical control equipment, and the curved silicon steel sheet strip is produced, and th...

Embodiment 2

[0034] combine image 3 As shown, the difference from Embodiment 1 is only that: two iron cores 20 in the box body 10 are arranged side by side. Correspondingly, there are also two windings 30 sleeved thereon. In this way, a common box-type internally connected transformer structure is realized, which reduces the volume of the transformer, reduces the manufacturing cost, and reduces the occupied area.

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PUM

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Abstract

The invention discloses a special open roll core and low-impedance transformer for electrified railways, which comprises a case, a core and a winding sleeving the core arranged in the case; the core is a single-phase open roll core, moreover, insulating medium is filled in the case, and the impedance voltage percentage of the special open roll core and low-impedance transformer for electrified railways is 3 percent to 4 percent. The advantages of the special open roll core and low-impedance transformer for electrified railways are as follows: the economic index is moderate, the energy-saving effect is obvious, and the special open roll core and low-impedance transformer for electrified railways can be efficiently produced in batches. The invention also discloses a production method for the special open roll core and low-impedance transformer for electrified railways.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a special open-roll iron core for electrified railways and a low-impedance transformer. The invention also relates to the preparation method of the special open-roll iron core for the electrified railway and the low-impedance transformer. Background technique [0002] Traction transformers are important power supply equipment for electrified railways, and the reduction of their economic and environmental costs is of great significance to electrified railway systems. [0003] The loss of traction transformer includes active loss and reactive loss. The no-load loss generated by the iron core is the most important component of active power loss. It is imperative to reduce the no-load loss by improving the iron core manufacturing process. In terms of reactive power loss, the traction transformer impedance voltage percentage is generally 8.4-10.5%, even up to 14%. By reducing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/24H01F27/28H01F38/00
Inventor 由振忠李晓新张亚新张冬冬张志强刘贺江白锡彬
Owner CHINA CREC RAILWAY ELECTRIFICATION BUREAU GRP
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