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Ultrahigh-voltage and low-dielectric-loss insulating material and production method thereof

A technology of insulating materials and production methods, which is applied in the field of pulp and paper making, and can solve problems such as affecting the life of transformers and wasting electric energy

Active Publication Date: 2018-05-04
CHINA NAT PULP & PAPER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large dielectric loss will affect the life of the transformer and waste electric energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Purify the insulating wood pulp with 0.5% hydrochloric acid, and the acid treatment time is 2 hours; the purified insulating wood pulp is first treated with disc grinding, the disc grinding concentration is 3.0%, and the current is 70A; the stone knife beater concentration is 6.0%, and it is fully divided The final beating degree is 60°SR, the wet weight is 2.2g, and the beating time is 5h.

[0031] 2) Cut off the Lyocell fibers with a length of 6mm and a fineness of 1.67 dtex with a disc grinder at a concentration of 15% and a current of 70A; a stone knife beater with a concentration of 5.4%, fully fibrillated to a beating degree of 80°SR, wet The weight is 1.3g, the average fiber length is 0.7mm, the average fiber width is 22.2μm, and the beating time is 6h.

[0032] 3) Mix insulating wood pulp and Lyocell fiber uniformly at a weight ratio of 9:1 without adding any additives.

[0033] 4) Papermaking is carried out on a fourdrinier paper machine to obtain a UHV low...

Embodiment 2

[0036] 1) Purify the insulating wood pulp with 1.0% hydrochloric acid, and the acid treatment time is 2 hours; the purified insulating wood pulp is first treated with disc grinding, the disc grinding concentration is 3.0%, and the current is 70A; the stone knife beater concentration is 6.0%, and it is fully divided The final beating degree is 65°SR, the wet weight is 2.0g, and the beating time is 5.5h.

[0037] 2) The flax pulp is first cut off with a disc mill, the disc mill concentration is 3.2%, and the current is 65A; then it is processed with a stone knife beater, the beating concentration is 5.6%, and the beating degree is 80°SR after being fully divided into silk brooms, and the wet weight is 1.5g. The average length is 1.0 mm, and the average fiber width is 26 μm. , beating time 6h.

[0038] 3) Mix insulating wood pulp and flax pulp uniformly in a weight ratio of 9:1 without adding any additives.

[0039] 4) Papermaking is carried out on a fourdrinier paper machine, ...

Embodiment 3

[0042] 1) Purify the insulating wood pulp with 1.0% hydrochloric acid, and the acid treatment time is 2 hours; the purified insulating wood pulp is first treated with disc grinding, the disc grinding concentration is 3.0%, and the current is 70A; the stone knife beater concentration is 6.0%, and it is fully divided The final beating degree is 58°SR, the wet weight is 2.0g, and the beating time is 5h.

[0043]2) Cut the Lyocell fiber with a length of 38 mm and a fineness of 1.67 dtex with a disc refiner, with a disc refiner concentration of 15%, a current of 70A; a stone knife beater concentration of 5.5%, and fully fibrillating treatment to a beating degree of 82°SR. The wet weight is 1.0g, the average fiber length is 0.5mm, the average fiber width is 23μm, and the beating time is 6h.

[0044] 3) Mix insulating wood pulp and Lyocell fiber uniformly at a ratio of 8.5:1.5 without adding any additives.

[0045] 4) Papermaking is carried out on a fourdrinier paper machine to obta...

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Abstract

The invention discloses an ultrahigh-voltage and low-dielectric-loss insulating material and a production method thereof. According to the technical scheme, insulating wood pulp is further purified, meanwhile, the insulating wood pulp, Lyocell fiber and flax pulp are processed in a special beating mode of combining free beating with wet beating, and a functional paper material is prepared throughpapermaking on a fourdrinier multi-cylinder paper machine by adopting desalted water and has the characteristics of high chemical purity, low dielectric loss, excellent dielectric property and the like. The ultrahigh-voltage and low-dielectric-loss insulating material is mainly applied to a transformer for electric power transmission; according to the development of the material, electric energy can be saved, the service life of the transformer is prolonged, imported products are substituted partially or totally step by step, and the material has certain social and economic benefits.

Description

technical field [0001] The invention relates to the field of pulp and papermaking, in particular to an ultra-high voltage low dielectric loss insulating material and a production method thereof. Background technique [0002] The transformer is an important equipment for electric energy transmission. The center of the voltage increase and decrease of the transformer is the coil, and the inter-turn insulating paper is the key insulating material of the coil. In the past 20 years, the development of my country's transformer insulating paper technology has stagnated, resulting in an increasing gap between the quality level of domestic transformer insulating paper and imported products, mainly in the chemical purity and dielectric properties of paper. At present, domestic products The dielectric loss is 0.25% (tgδ, 100°C), which is far behind the international advanced level (0.19%tgδ, 100°C). A large dielectric loss will affect the life of the transformer and waste electric ener...

Claims

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Application Information

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IPC IPC(8): D21H11/12D21H13/08D21D1/02D21D1/30D21H27/12
CPCD21D1/02D21D1/30D21H11/12D21H13/08D21H27/00
Inventor 陈雪峰许跃刘文万莹毛宗久黄小雷
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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