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Low-dielectric-constant insulating paper and preparation method thereof

A low dielectric constant, insulating paper technology, applied in insulators, organic insulators, plastic/resin/wax insulators, etc., can solve the problems of reducing the dielectric constant of insulating paper and increasing the cost of synthetic fibers, achieving low cost and improving insulation. performance, the effect of prolonging the safety life

Inactive Publication Date: 2012-10-24
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both methods can achieve the purpose of reducing the dielectric constant of insulating paper, but the use of synthetic fibers will increase the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In this embodiment, the required test materials are: cardboard (component A), and silica hollow microspheres with an average diameter of 500 nm (component B). After the cardboard is beaten according to the general insulating paper making procedure, it is diluted to 0.4wt.%, and it is defibrated in a fiber dissociator for 3 minutes, and the shaken SiO 2 Pour the suspension of hollow microspheres into the fiber dissociator and continue to stir for 10 minutes to make it evenly mixed. The stirring temperature is normal temperature, the stirring time is 1-20min, and the stirring rate is 3000r·min -1 , SiO 2 The amount of the hollow microsphere suspension is 5wt.%, and finally, it is made into a quantitative 120g / m on a paper former. 2 After compaction, the insulating paper is dried at 105 degrees Celsius for 5 minutes to complete the preparation. The prepared insulating paper contains SiO 2 The mass percentage of hollow microspheres is 5%. SiO 2 Preparation method of hol...

Embodiment 2

[0018] In this embodiment, the required test materials are: cardboard (component A), and silica hollow microspheres with a diameter of 500 nm (component B). After beating the cardboard according to the general insulating paper making procedure, dilute it to 0.4wt.%, and dissolve it in the fiber dissociator for 3 minutes, pour the shaken SiO2 hollow microsphere suspension into the fiber dissociator and continue stirring Let it mix evenly for 10 minutes, the stirring temperature is normal temperature, the stirring time is 1-20min, and the stirring rate is 3000r·min -1 . Finally, an insulating paper with a basis weight of 120 g / m2 was made on a sheet former. After compaction, it is dried at 105 degrees Celsius for 5 minutes to complete the preparation. The mass percent of SiO2 hollow microspheres in the prepared insulating paper is 3%.

[0019] The dielectric constant of the modified insulating paper after oil immersion was measured, and the dielectric constant of the insulati...

Embodiment 3

[0021] In this embodiment, the required test materials are: cardboard (component A), and silica hollow microspheres with a diameter of 500 nm (component B). After beating the cardboard according to the general insulating paper making procedure, dilute it to 0.4wt.%, and dissolve it in the fiber dissociator for 3 minutes, pour the shaken SiO2 hollow microsphere suspension into the fiber dissociator and continue stirring Let it mix evenly for 10 minutes, the stirring temperature is normal temperature, the stirring time is 1-20min, and the stirring rate is 3000r·min -1 . Finally, an insulating paper with a basis weight of 120 g / m2 was made on a sheet former. After compaction, it is dried at 105 degrees Celsius for 5 minutes to complete the preparation. The mass percent of SiO2 hollow microspheres in the prepared insulating paper is 7%.

[0022] The dielectric constant of the modified insulating paper after oil immersion was measured, and the dielectric constant of the insulati...

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Abstract

The invention discloses a preparation method of low-dielectric-constant insulating paper. The method comprises the following steps of: stirring and dispersing raw wood pulp by use of a defibering device; pouring the prepared SiO2 hollow microsphere suspension into the defibering device, mixing, and continuing to stirring, wherein the stirring temperature is normal temperature, the stirring time after the mixing is 2-10 minutes, and the stirring rate is 3,000r / min; after the stirring, manufacturing the insulating paper quantized to 120g / m<2> on a paper former; and compacting and forming, wherein the SiO2 hollow microsphere added to the obtained low-dielectric constant insulating paper accounts for 1-7%. In the modified insulating paper disclosed by the invention, silicon dioxide hollow microsphere is added, the insulating performance of a transformer composite insulating system is improved by reducing the relative dielectric constant of the insulating paper, and the safe service life is prolonged. Meanwhile, the steps of the preparation method are simple and easy to realize, and the cost is low.

Description

technical field [0001] The invention relates to the field of electrical equipment insulation systems, and relates to a novel modified insulating paper, in particular to a low dielectric constant insulating paper used in a transformer composite insulation system, and also relates to a preparation method thereof. Background technique [0002] The transformer is the core equipment in the power system. At present, the inner insulation of the ultra-high voltage transformer is composed of cellulose material and transformer oil. The cellulose material is divided into two types: insulating paper and insulating cardboard. The oil-impregnated insulating paper used in transformers is commonly known as kraft paper, and its main component is natural cellulose. It was widely used in oil-immersed power equipment in the 1890s. Kraft paper is cheap and initially has good mechanical strength and electrical strength. It has always been the preferred insulating material for most oil-immersed t...

Claims

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Application Information

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IPC IPC(8): D21H27/12D21H17/66
Inventor 廖瑞金杨丽君李剑张福洲王谦刘团张爽张镱议
Owner CHONGQING UNIV
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