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Low-sodium-ion-content insulating paper for extra-high-voltage transformer and manufacturing method thereof

A manufacturing method and transformer technology, which are applied in pulp beating method, transformer/inductor components, transformer/inductor coil/winding/connection, etc., can solve the problem of high conductivity, affecting the service life of insulating paper, and the breakdown strength drop etc.

Inactive Publication Date: 2020-10-23
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

If the sodium ion content in the insulating paper is high, the conductivity of the water extraction liquid of the paper will be high, the breakdown strength will decrease, and the dielectric loss will increase, which will eventually affect the service life of the insulating paper

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1) Adjust the insulating wood pulp to a concentration of 3% after thawing, and use 1% hydrochloric acid (for the absolute dry insulating wood pulp) to acid-treat the insulating wood pulp for 30 minutes, and then pass through the first stage with a conductivity of 4.5 μS / cm, pH value of 7.0-7.5 at 60 ℃ desalted water washing, the second and third stages are washed with deionized water at room temperature; after that, magnesium salt treatment: adjust the concentration of the acid-treated insulating wood pulp to 3%, add 2.5% magnesium salt (to the amount of absolute dry insulating wood pulp) is treated for 30 minutes, and then the pulp treated with magnesium salt is washed with deionized water in three stages until the pH of the water extract of the slurry is 6.3 and the conductivity 2.5mS / m.

[0016] 2) Adjust the pulp concentration of the purified insulating softwood pulp to 3.5%, use a disc refiner to beat the pulp to 35°SR, then concentrate the pulp to a concentration...

Embodiment 2

[0021] 1) After thawing the insulating wood pulp, adjust it to a concentration of 3%, and use 1% hydrochloric acid (for the amount of absolute dry insulating wood pulp) to acid-treat the insulating wood pulp for 45 minutes, and then pass through the first stage with a conductivity of 4.5 μS / cm, pH value of 7.0-7.5 at 60 ℃ desalted water washing, the second and third stages are washed with deionized water at room temperature; after that, magnesium salt treatment: adjust the concentration of the acid-treated insulating wood pulp to 3%, add 2.5% magnesium salt (for absolute dry insulating wood pulp) is treated for 45 minutes, and then the pulp treated with magnesium salt is washed with 4 stages of deionized water until the pH of the water extract of the slurry is 6.6 and the conductivity 2.4mS / m.

[0022] 2) Thicken the purified insulating softwood pulp to 3.5%, use a disc refiner to beat the pulp to 37°SR, then concentrate the pulp to a concentration of 5.5%, and use a trough s...

Embodiment 3

[0027] 1) After thawing the insulating wood pulp, adjust it to a concentration of 3%, and use 1% hydrochloric acid (for the amount of absolute dry insulating wood pulp) to acid-treat the insulating wood pulp for 60 minutes, and then pass through the first stage with a conductivity of 4.5 μS / cm, pH value of 7.0-7.5 at 60 ℃ desalted water washing, the second and third stages are washed with deionized water at room temperature; after that, magnesium salt treatment: adjust the concentration of the acid-treated insulating wood pulp to 3%, add 2.5% magnesium salt (for absolute dry insulating wood pulp) is treated for 60 minutes, and then the pulp treated with magnesium salt is washed with 4 stages of deionized water until the pH of the water extract of the slurry is 6.7 and the conductivity 2.3mS / m.

[0028] 2) Thicken the purified insulating softwood pulp to 3.5%, use a disc refiner to beat the pulp to 40°SR, then concentrate the pulp to a concentration of 6%, and use a trough sto...

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Abstract

The invention relates to low-sodium-ion-content insulation paper for an extra-high-voltage transformer and a manufacturing method thereof. The method comprises the following steps: firstly, natural-color sulfate insulation softwood pulp is purified; then, a combined pulping process is adopted for pulping; then, a double-cylinder paper machine is adopted for manufacturing body paper through double-layer composite papermaking; and finally, the body paper is subjected to super calendaring to obtain the low-sodium-ion-content insulation paper. The insulation paper manufactured by using the methodis low in sodium ion content, high in tearing strength and high in electrical performance.

Description

technical field [0001] The invention relates to the field of pulping and papermaking, in particular to insulating paper with low sodium ion content for UHV transformers and a manufacturing method thereof. Background technique [0002] Insulating paper is an important insulating material in transformers, which is wound on high and low voltage winding coils. In oil-immersed transformers, the insulation structure of oil-immersed insulating paper is the most commonly used main insulation, and its reliability is directly related to the safety and stability of the power grid. Compared with foreign imported insulating paper, the gap between my country's transformer turn-to-turn insulating paper is mainly manifested in the problems of high sodium ion content, high ash content, and low tearing degree of the paper. The ash content of domestic insulating paper is generally 0.25%, while that of imported insulating paper is generally 0.19%; the sodium ion content of domestic paper is as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C9/02D21C9/08D21D1/02D21F11/08D21H11/04D21H27/12H01B3/52H01F27/32
CPCD21C9/02D21C9/083D21D1/02D21F11/08D21H11/04H01B3/52H01F27/324
Inventor 刘群华曹春昱刘文
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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