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High-in-oil breakdown strength insulation paper for extra-high voltage transformer and manufacturing method thereof

A technology of breakdown strength and manufacturing method, applied in pulp beating method, paper, papermaking, etc., can solve the problems of low breakdown strength, poor uniformity, and low tearing degree of insulating paper between turns of transformers

Pending Publication Date: 2021-09-28
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

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 lower breakdown strength in oil, lower tearing degree, and poor uniformity of the paper.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) After thawing the electronic grade insulating wood pulp, adjust it to a concentration of 4%, and use 0.5% hydrochloric acid (for absolute dry insulating wood pulp) to acid-treat the insulating wood pulp for 1 hour, and then pass through the first stage Conductivity 2.5μS / cm, pH value 7.0-7.5 desalinated water washing at 60°C, the second stage is washed with normal temperature deionized water; after that, magnesium salt treatment: adjust the concentration of acid-treated insulating wood pulp to 4% , adding 1.5% magnesium salt (to the amount of absolute dry insulating wood pulp) for treatment, the treatment time is 1 hour, and then washing the pulp treated with magnesium salt in three stages of deionized water until the pH of the water extract of the slurry is 6.5 , Conductivity 2.3mS / m.

[0018] (2) Adopt combined beating mode to prepare double-layer pulp with different beating degrees: A, bottom layer pulp: first the electronic grade natural color kraft softwood ins...

Embodiment 2

[0024] (1) After thawing the electronic grade insulating wood pulp, adjust it to a concentration of 4%, and use 0.5% hydrochloric acid (for absolute dry insulating wood pulp) to acid-treat the insulating wood pulp for 1 hour, and then pass through the first stage Conductivity 2.5μS / cm, pH value 7.0-7.5 desalinated water washing at 60°C, the second stage is washed with normal temperature deionized water; after that, magnesium salt treatment: adjust the concentration of acid-treated insulating wood pulp to 4% , add 1.5% magnesium salt (to the amount of absolute dry insulating wood pulp) for treatment, the treatment time is 1.3 hours, and then wash the pulp treated with magnesium salt in three stages of deionized water until the pH of the water extract of the slurry is 6.6 , Conductivity 2.2mS / m.

[0025] (2) Adopt combined beating mode to prepare double-layer pulp with different beating degrees: A, bottom layer pulp: first the electronic grade natural color kraft softwood insulati...

Embodiment 3

[0031] (1) After thawing the electronic grade insulating wood pulp, adjust it to a concentration of 4%, and use 0.5% hydrochloric acid (for absolute dry insulating wood pulp) to acid-treat the insulating wood pulp for 1 hour, and then pass through the first stage Conductivity 2.5μS / cm, pH value 7.0-7.5 desalinated water washing at 60°C, the second stage is washed with normal temperature deionized water; after that, magnesium salt treatment: adjust the concentration of acid-treated insulating wood pulp to 4% , add 1.5% magnesium salt (to the amount of absolute dry insulating wood pulp) for treatment, the treatment time is 1.5 hours, and then wash the pulp treated with magnesium salt in three stages of deionized water until the pH of the water extract of the slurry is 6.5 , Conductivity 2.0mS / m.

[0032] (2) Adopt combined beating mode to prepare double-layer pulp with different beating degrees: A, bottom layer pulp: first the electronic grade natural color kraft softwood insula...

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Abstract

The invention relates to a high-in-oil breakdown strength insulation paper for an extra-high voltage transformer and a manufacturing method thereof, the insulation paper adopts electronic grade natural color sulfate needlebush insulation pulp as a raw material, the pulp is subjected to purification treatment to prepare double-layer pulp with different beating degrees, a small amount of dispersing agent is added into the pulp, and then a double-cylinder paper machine is adopted for compounding and papermaking to form raw paper, and finally, super calendering is performed so as to obtain the raw paper. The breakdown strength in oil of the insulating paper manufactured by adopting the method is improved by 66% compared with that of insulating paper manufactured by adopting single-layer paper making, and is improved by 45% compared with that of insulating paper manufactured by adopting double-layer paper making with the same beating degree.

Description

technical field [0001] The invention relates to the field of pulping and papermaking, in particular to insulating paper with high breakdown strength in oil for UHV transformers and a manufacturing method thereof. Background technique [0002] Turn-to-turn insulating paper is an important insulating material in transformers, which is used to wind 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. The breakdown strength of insulating paper in oil is a key index of insulating paper, which is directly related to the service life of the transformer and the safety and stability of the power grid. . The oil breakdown strength of domestic insulating paper is generally 40-45kV / mm, while imported insulating paper is generally above 50kV / mm. Compared with foreign imported insulating paper, the gap between my country's transformer turn-to-turn insulating paper is mainly ...

Claims

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Application Information

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IPC IPC(8): D21C9/00D21D1/02D21F11/08D21H11/04D21H21/08
CPCD21H11/04D21D1/02D21F11/08D21H21/08D21C9/004
Inventor 刘群华曹春昱刘文
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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