Pressure gel molding method of resin insulating dry-type transformer coil

A technology of dry-type transformer and pressure gel, which is applied in the direction of inductance/transformer/magnet manufacturing, encapsulation/impregnation, electrical components, etc. It can solve the problems of poor resin penetration, long gel time, high partial discharge of coils, etc., to achieve Effects of improving quality, increasing gel temperature, and reducing partial discharge

Inactive Publication Date: 2016-11-23
广州市特宏电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the problems of long gel time, poor penetration ability of resin, and high partial discharge of the prepared coil.

Method used

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  • Pressure gel molding method of resin insulating dry-type transformer coil
  • Pressure gel molding method of resin insulating dry-type transformer coil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A resin-insulated dry-type transformer coil pressure gel forming method includes the following steps:

[0035] (1) Place the transformer coil in the coil encapsulation mold to obtain a coil encapsulation mold with a built-in coil;

[0036] Mix the epoxy resin and the curing agent under the conditions of a temperature of 60℃ and a vacuum of 150pa, and degas for 1 hour until no bubbles emerge on the surface, then add the accelerator and mix for 15 minutes to obtain an epoxy resin castable; , The epoxy resin is bisphenol A epoxy resin, the curing agent is tetrahydrophthalic anhydride, the accelerator is 2-ethyl-4-methylimidazole, and the weight ratio of epoxy resin, curing agent and accelerator is Epoxy resin: curing agent: accelerator=100:80:1;

[0037] (2) Adjust the temperature in the pouring furnace to 80℃ and the vacuum degree to 200pa. Place the coil encapsulation mold with the built-in coil in the pouring furnace for 3h. Adjust the vacuum to 800pa before pouring. After po...

Embodiment 2

[0041] A resin-insulated dry-type transformer coil pressure gel forming method includes the following steps:

[0042] (1) Place the transformer coil in the coil encapsulation mold to obtain a coil encapsulation mold with a built-in coil;

[0043] Mix the epoxy resin and the curing agent under the conditions of a temperature of 63°C and a vacuum of 180pa, and degas for 2 hours until no bubbles emerge on the surface. Then add the accelerator and mix for 20 minutes to obtain an epoxy resin castable; , The epoxy resin is bisphenol A epoxy resin, the curing agent is tetrahydrophthalic anhydride, the accelerator is 2-ethyl-4-methylimidazole, and the weight ratio of epoxy resin, curing agent and accelerator is Epoxy resin: curing agent: accelerator=100:80:1;

[0044] (2) Adjust the temperature in the pouring furnace to 83℃ and the vacuum degree to 250pa. Put the coil encapsulation mold with built-in coil in the pouring furnace for 4h. Adjust the vacuum degree to 900pa before pouring. After...

Embodiment 3

[0048] A resin-insulated dry-type transformer coil pressure gel forming method includes the following steps:

[0049] (1) Place the transformer coil in the coil encapsulation mold to obtain a coil encapsulation mold with a built-in coil;

[0050] Mix the epoxy resin and the curing agent under the conditions of a temperature of 65°C and a vacuum degree of 200 Pa, and degas for 2.5 hours until no bubbles emerge on the surface, then add the accelerator and mix for 30 minutes to obtain an epoxy resin castable; Among them, the epoxy resin is bisphenol A epoxy resin, the curing agent is tetrahydrophthalic anhydride, the accelerator is 2-ethyl-4-methylimidazole, and the weight ratio of epoxy resin, curing agent and accelerator For epoxy resin: curing agent: accelerator=100:80:1;

[0051] (2) Adjust the temperature in the pouring furnace to 85℃ and the vacuum degree to 300pa. Place the coil encapsulating mold with built-in coils in the pouring furnace for 5h. Adjust the vacuum to 1000pa bef...

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PUM

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Abstract

The invention discloses a pressure gel molding method of a resin insulating dry-type transformer coil. The pressure gel molding method comprises the following steps: (1) casting a coil packaging mold internally provided with coil through utilizing epoxy resin castable; (2) after casting, carrying out gel treatment on epoxy resin under the conditions that the pressure is 2MPa-3.5MPa and the temperature is 100-120 DEG C; and (3) curing the epoxy resin. With the adoption of the method disclosed by the invention, the gel time is shortened, the viscosity of the epoxy resin is reduced and the penetration capability of the epoxy resin is greatly reduced under the action of pressure; and meanwhile, the partial discharge amount of the coil is reduced.

Description

Technical field [0001] The invention relates to a resin gel molding method, in particular to a resin-insulated dry-type transformer coil pressure gel molding method. Background technique [0002] When making an insulated dry-type transformer, the coil needs to be encapsulated with epoxy resin. After the epoxy resin is poured into the coil encapsulation mold, the epoxy resin needs to be gel-cured. The existing gel treatment method is: after the coil encapsulation mold is poured with epoxy resin, pressurize it to 3 atmospheres, let it stand for 20-30 minutes, and then gel under the temperature condition of 85°C. Process for 8-10 hours. This method has the problems of long gel time, poor resin penetration ability, and high partial discharge capacity of the coil produced. Summary of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a resin-insulated dry-type transformer coil pressure gel molding method. The metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/00
CPCH01F41/005
Inventor 何小华
Owner 广州市特宏电器有限公司
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