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Casting materials and casting method for 35kV-grade large-capacity dry main transformer coil

A pouring method and large-capacity technology, which is applied in coil manufacturing and other directions, can solve problems such as glass fibers are easy to fly with the wind, affect the health of workers, and coils are easy to crack, so as to avoid harm to the human body, extend the pouring time, and prolong The effect of reaction time

Inactive Publication Date: 2015-03-04
JIANGSU HUACHEN TRANSFORMER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The pouring is not complete, and it is easy to generate air bubbles, which makes the coils easy to crack after casting;
[0005] 2. During the mixing and pouring process, the glass fiber is easy to fly with the wind and enter the trachea and lungs with breathing, affecting the health of workers

Method used

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  • Casting materials and casting method for 35kV-grade large-capacity dry main transformer coil
  • Casting materials and casting method for 35kV-grade large-capacity dry main transformer coil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The formula and pouring method used in the pouring ingredients of the 35kV class large-capacity dry-type main transformer provided in this example are as follows:

[0020] Select 45 parts of resin, 45 parts of curing agent, and 90-110 parts of microsilica powder according to the ratio of parts by weight; first, mix 45 parts of resin and 45-55 parts of microsilica powder and stir until uniform; 45-55 parts of curing agent mixed with the remaining 45-55 parts of silicon powder, and stirred until uniform; then the above-mentioned resin silicon powder mixture and curing agent silicon powder mixture were mixed, and degassed while stirring. The stirring and degassing process was about 30 minutes; finally, pour the stirred and degassed mixture into the mold to realize the coil casting of the dry main transformer.

Embodiment 2

[0022] The formula and pouring method used in the pouring ingredients of the 35kV class large-capacity dry-type main transformer provided in this example are as follows:

[0023] Select 55 parts of resin, 55 parts of curing agent, and 90 parts of microsilica powder according to the proportioning by weight; first, mix and stir 55 parts of resin and 45 parts of microsilica powder; simultaneously mix 55 parts of curing agent with Mix and stir the remaining 45 parts of microsilica powder; then mix the above resin microsilica powder mixture with the curing agent microsilica powder mixture, and degas while stirring. The stirring and degassing process is about 30 minutes; finally, stir and degas The final mixture is poured into the mold to realize the coil casting of the dry main transformer.

Embodiment 3

[0025] The formula and pouring method used in the pouring ingredients of the 35kV class large-capacity dry-type main transformer provided in this example are as follows:

[0026] Select 50 parts of resin, 50 parts of curing agent, and 100 parts of microsilica powder according to the ratio of parts by weight; first, mix and stir 50 parts of resin and 50 parts of microsilica powder; simultaneously mix 50 parts of curing agent with Mix and stir the remaining 50 parts of microsilica powder; then mix the above resin microsilica powder mixture with the curing agent microsilica powder mixture, and degas while stirring. The stirring and degassing process is about 30 minutes; finally, stir and degas The final mixture is poured into the mold to realize the coil casting of the dry main transformer.

[0027] In the above three embodiments, the set value of the resin degassing vacuum degree is not higher than 133Pa, and the vacuum degree after inputting the curing agent is not higher than ...

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Abstract

The present invention discloses casting materials and a casting method for a 35kV-grade large-capacity dry main transformer coil. The casting materials comprise a resin, a curing agent, and silicon micro-powder, wherein a weight part ratio of the resin to the silicon micro-powder is 45-55:90-110, and a weight part ratio of the resin to the curing agent is 1:1. The method comprises: pre-mixing the resin and the silicon micro-powder, and pre-mixing the curing agent and the silicon micro-powder, wherein the weights of the resin and the curing agent are the same; mixing the resin-silicon micro-powder mixture and the curing agent-silicon micro-powder mixture, stirring, and degassing; and finally pouring the stirred and degassed mixture into a mold to achieve the dry main transformer coil casting. According to the present invention, the casting of the 35kV-grade large-capacity dry main transformer coil can be achieved, the coil formed by using the materials and the casting method has the high strength and does not crack; and the glass fibers are not adopted, such that the damage of the glass fibers on human body is effectively avoided.

Description

technical field [0001] The invention relates to a dry-type main transformer pouring ingredient and a method thereof, in particular to a 35kV-level large-capacity dry-type main transformer coil pouring ingredient and a method thereof, and belongs to the technical field of large-capacity dry-type main transformer pouring ingredients and a method thereof. Background technique [0002] At present, for small-capacity dry-type main transformer coils such as 5kv or 10kv, manufacturers generally use the ingredients of resin, curing agent and silicon micropowder, first add the resin and curing agent to the reaction bottle according to a certain proportion, stir to a certain temperature, and then Add silicon micropowder into it, stir it evenly, depressurize it, and keep it until there is no bubble, and the material can be discharged when it is exposed to vacuum; finally, the discharged material is poured into the mold to realize the casting of the dry-type main transformer coil. Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L101/00C08K3/36B29C39/10H01F41/04
Inventor 牛敬坤张孝金孙昌董蔡伟
Owner JIANGSU HUACHEN TRANSFORMER
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