Insulating film for transformer coil and preparation method of insulating film

A technology of transformer coils and insulating films, applied in the field of transformers, can solve the problems of the strength of insulating resin layers, poor corrosion resistance, working temperature difference, inability to meet the high power output of transformers, etc., and achieves good corrosion resistance, good weather resistance, and high ceramic hardness. Effect

Pending Publication Date: 2022-01-21
GUANGDONG POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the application provides an insulating film of a transformer coil and a preparation method thereof, which can solve the problem of the strength, corrosion resistance, and working temperature difference of the insulating resin layer coated on the surface of the electromagnetic wire used in the transformer coil in the prior art. Technical problems that cannot meet the high power output of transformers

Method used

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  • Insulating film for transformer coil and preparation method of insulating film
  • Insulating film for transformer coil and preparation method of insulating film
  • Insulating film for transformer coil and preparation method of insulating film

Examples

Experimental program
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Effect test

Embodiment 1

[0057] This embodiment 1 provides the first method for preparing an insulating film of a transformer coil, comprising the following steps:

[0058] Step S0, grinding and cleaning: Grinding and polishing the surface of the aluminum substrate with a pair of metal roller brushes, immersing the polished aluminum substrate in a solution with a sulfuric acid concentration of 140-200g / L for 3 minutes, and then rinsing and scrubbing with clean water to clean the surface In addition, the surface of the ground and polished aluminum substrate is smooth and flat.

[0059] Step S1, micro-arc oxidation: the polished and cleaned aluminum substrate in step S0 is completely immersed in an electroplating tank filled with electrolyte.

[0060] Step S2, by applying an AC voltage to the two electrodes preset in the electroplating tank, making them alternately serve as anodes and cathodes, so that an alumina ceramic layer is formed on the surface of the aluminum substrate immersed in the electrolyt...

Embodiment 2

[0069] This embodiment 2 is to detect the hardness, friction coefficient, breakdown voltage, corrosion resistance and heat transfer coefficient of the insulation film of the transformer coil prepared in embodiment 1; also detect the traditional resin transformer with only an insulating resin layer on the surface of the transformer coil The weight, operating temperature, and energy efficiency of the transformer whose surface is the insulating film of the transformer coil prepared in Example 1 are shown in Table 1 and Table 2.

[0070] It can be seen from Table 1 that the hardness, friction coefficient, breakdown voltage, corrosion resistance and heat transfer coefficient of the insulation film of the transformer coil prepared in Example 1 are excellent, and can meet the requirements of the high power output of the transformer, such as strength, corrosion resistance, and workability. temperature difference requirements;

[0071] As can be seen from Table 2, the weight, operating...

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Abstract

The invention belongs to the technical field of transformers, and particularly relates to an insulating film for a transformer coil and a preparation method of the insulating film. According to the insulating film for the transformer coil and the preparation method of the insulating film in the invention, the preparation method of the insulating film for the transformer coil comprises the step that a metal oxide ceramic layer is generated in situ on the surface of the transformer coil made of a metal material through micro-arc oxidation; and the metal oxide ceramic layer has the properties of high hardness, corrosion resistance, good weather resistance and the like, and the metal oxide ceramic layer is not prone to cracking and falling off from the surface of the coil due to an in-situ generated connection mode. The insulating film for the transformer coil and the preparation method of the insulating film can overcome the technical problems that an insulating resin layer coating the surface of an electromagnetic wire adopted by the transformer coil is poor in strength, corrosion resistance and working temperature and high-power output of a transformer cannot be met in the prior art.

Description

technical field [0001] The application belongs to the technical field of transformers, and in particular relates to an insulating film of a transformer coil and a preparation method thereof. Background technique [0002] The surface of the electromagnetic wire used in the existing transformer coil is generally coated with insulating resin, so that the transformer has a certain insulation performance; but when the transformer outputs high power, the temperature of the metal transformer coil will rise, and the coating on the transformer The insulating resin on the surface of the coil has poor heat resistance and is easy to melt at high temperatures, resulting in unstable insulation performance of the transformer, damage to the transformer, and low corrosion resistance of the resin. [0003] Therefore, the strength, corrosion resistance, and working temperature difference of the insulating resin layer coated on the surface of the electromagnetic wire used in the transformer coi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/32H01F41/12C25D11/06C25D11/16C25D11/18
CPCH01F27/324H01F41/125C25D11/026C25D11/06C25D11/16C25D11/18
Inventor 江霖陈建福汪进锋常雯雪金杨黄杨珏李爱平陈卓航
Owner GUANGDONG POWER GRID CO LTD
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