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Cross-linked polyethylene power cable nano repairing liquid and repairing method thereof

A cross-linked polyethylene, power cable technology, applied in the direction of insulation/armoured cable repair equipment, organic insulators, plastic/resin/wax insulators, etc., can solve the problem of low catalyst diffusion coefficient, poor hydrolysis reaction effect, and inconsistent diffusion coefficient and other problems, to achieve the effect of safe and reliable equipment, weaken the intensity of partial discharge, and improve the effect of repair

Active Publication Date: 2010-10-20
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology still has the following deficiencies: First, its short-term performance improvement effect on insulation is obvious, but the medium and long-term effect is not good; second, the diffusion coefficients of various components of the repair fluid in the cable are inconsistent. The diffusion coefficient is low, resulting in poor hydrolysis reaction; the third is that its flash point is low, about 0°C, so there are potential safety hazards; the fourth is that the reaction time is too long, and sometimes it needs to be soaked for a few days to a week
Searching domestic and foreign literature databases, the previous cable repair technology was mainly based on siloxane repair fluid, and there are no patent documents or non-patent literature reports on adding inorganic nanoparticles to the repair fluid. Nano repair fluid prolongs water tree aging. The method and effect of cable life are still blank at home and abroad

Method used

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  • Cross-linked polyethylene power cable nano repairing liquid and repairing method thereof
  • Cross-linked polyethylene power cable nano repairing liquid and repairing method thereof
  • Cross-linked polyethylene power cable nano repairing liquid and repairing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1. Preparation of cross-linked polyethylene power cable nano repair solution

[0051] 1.1 Preparation of nanoparticle dispersion

[0052] Add 12 parts of nano-titanium dioxide coated with nano-silica on the surface, 1 part of nano-alumina, 1 part of nano-silicon dioxide, 1 part of nano-zinc oxide and 60 parts of solvent into a mixing tank with a stirrer, a thermometer and a reflux condenser. In the container, the ultrasonic disperser and the sand mill disperser are used to pre-disperse to obtain a nanoparticle dispersion, wherein the ultrasonic power is 300W, the frequency is 22kHz, and the time is 45min.

[0053] 1.2 Preparation of repair solution

[0054] Fully mix 75 parts of the above-mentioned nanoparticle dispersion liquid after the pre-dispersion process with 240 parts of the siloxane repair solution and 5 parts of the catalyst, and use the above-mentioned pre-dispersion method to disperse again to obtain nano-repair of cross-linked polyethylene power cables li...

Embodiment 2

[0064] 1. Preparation of cross-linked polyethylene power cable nano repair solution

[0065] 1.1 Preparation of nanoparticle dispersion

[0066] Add 10 parts of nano-titanium dioxide coated with nano-silica on the surface, 0.5 parts of nano-alumina, 0.5 parts of nano-silicon dioxide, 0.5 parts of nano-zinc oxide and 40 parts of solvent into a mixing tank with a stirrer, a thermometer and a reflux condenser. In the container, an ultrasonic disperser and a sand mill disperser are used to pre-disperse to obtain a nanoparticle dispersion, wherein the ultrasonic power is 200W, the frequency is 20kHz, and the time is 30min.

[0067] 1.2 Preparation of repair solution

[0068] Fully mix 50 parts of the above-mentioned nanoparticle dispersion liquid after the pre-dispersion process with 200 parts of the siloxane repair solution and 1 part of the catalyst, and use the above-mentioned pre-dispersion method to disperse again to obtain nano-repair of cross-linked polyethylene power cable...

Embodiment 3

[0078] 1. Preparation of cross-linked polyethylene power cable nano repair solution

[0079] 1.1 Preparation of nanoparticle dispersion

[0080] Add 15 parts of nano-titanium dioxide coated with nano-silica on the surface, 2 parts of nano-aluminum oxide, 2 parts of nano-silicon dioxide, 2 parts of nano-zinc oxide and 80 parts of solvent into the tank with agitator, thermometer and reflux condenser. In the container, pre-dispersion is carried out by combining an ultrasonic disperser and a sand mill disperser to obtain a nanoparticle dispersion, wherein the ultrasonic power is 500W, the frequency is 24kHz, and the time is 60min.

[0081] 1.2 Preparation of repair solution

[0082] Fully mix 100 parts of the above-mentioned nanoparticle dispersion liquid after the pre-dispersion process with 300 parts of the siloxane repair solution and 10 parts of the catalyst, and use the above-mentioned pre-dispersion method to disperse again to obtain nano-repair of cross-linked polyethylene...

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Abstract

The invention discloses a cross-linked polyethylene power cable nano repairing liquid and repairing method thereof, which is characterized in that inorganic nano particles and organic solvent form nano dispersion, and a layer of inorganic nano protective film is formed by filing air gaps or micropores inside the cable through the inorganic nano particles based on a siloxane repairing liquid so as to protect a polyethylene insulating layer. Compared with the traditional siloxane repairing technology, the invention can prolong the residual service life of the power cable by 5-10 times, has the advantages of advanced technology, safety and stability, short repairing time and good repairing effect.

Description

technical field [0001] The invention relates to a cross-linked polyethylene power cable nano repair liquid and a repair method thereof, belonging to the field of cable repair. It can be used in the repair project of XLPE power cables after long-term operation and insulation aging. Background technique [0002] With my country's large-scale urban network transformation in the early 1990s, a large number of 10kV overhead lines were changed to ground cables, and cross-linked polyethylene (XLPE) power cables have been widely used in my country's urban power grids due to their reliable electrical and mechanical properties. Applications. However, due to the poor waterproof performance of early cables and the inevitable occurrence of some microscopic defects in the process of manufacturing, construction and operation, moisture will gather at the microscopic defects under the action of an electric field, forming multi-branched water tree areas, and eventually Electric trees will be...

Claims

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Application Information

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IPC IPC(8): H01B3/46C08L83/04C08K13/06C08K9/10C08K3/22C08K3/36H02G1/16
Inventor 周凯张涛董凌江黄友聪牟秋谷文承家
Owner SICHUAN UNIV
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