Free-radical scavenger for resisting insulation aging of power cable and automatic healing method of free-radical scavenger

A technology for insulation aging and power cables, which is applied to organic insulators, plastic/resin/wax insulators, insulation/armoured cable repair equipment, etc., to achieve obvious anti-aging effects, inhibit aging aggravation, and shorten the implementation time

Active Publication Date: 2012-09-19
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the water tree repair technology still has a lot of inconvenience in actual use

Method used

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  • Free-radical scavenger for resisting insulation aging of power cable and automatic healing method of free-radical scavenger
  • Free-radical scavenger for resisting insulation aging of power cable and automatic healing method of free-radical scavenger
  • Free-radical scavenger for resisting insulation aging of power cable and automatic healing method of free-radical scavenger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Preparation of free radical scavenger solution

[0038] Fully mix 10 parts of 2,-methyl-4,6-bis(octylthiomethylene)phenol, 5 parts of dodecylbenzenesulfonic acid, 10 parts of siloxane and 50 parts of acetone, and disperse by ultrasonic Machine and sand mill disperser are combined to disperse to obtain free radical scavenger dispersion.

[0039] 2. Applying a free radical scavenger solution to the cable using a pressure injection system

[0040] Use an air compressor to compress the air so that the injection pressure is 0.1 MPa. After filtering through the filter bottle, add the dispersion of the above free radical scavenger into the free radical scavenger solution tank, and the free radical scavenger solution enters the exchange tank under pressure. Joint polyethylene cable core, stop injecting after 4h.

[0041] 3. Performance testing

[0042] Take 12 cable samples, 6 of which are injected with free radical scavenger solution, and the other 6 are not injected. Th...

Embodiment 2

[0044] 1. Preparation of free radical scavenger solution

[0045] Mix 15 parts of 2,-methyl-4,6-bis(octylthiomethylene)phenol, 8 parts of dodecylbenzenesulfonic acid, 15 parts of siloxane and 50 parts of chloroform, and disperse them by ultrasonic Machine and sand mill disperser are combined to disperse to obtain free radical scavenger dispersion.

[0046] 2. Applying a free radical scavenger solution to the cable using a pressure injection system

[0047] Use an air compressor to compress the air to make the injection pressure 0.2MPa. After filtering through the filter bottle, add the dispersion of the above free radical scavenger into the free radical scavenger solution tank, and the free radical scavenger solution enters the exchange tank under pressure. Joint polyethylene cable core, stop injecting after 3h.

[0048] 3. Performance testing

[0049] Take 10 cable samples, 5 of which are injected with free radical scavenger, and the other 5 are not injected. Apply 400Hz a...

Embodiment 3

[0051] 1. Preparation of free radical scavenger solution

[0052] Mix 20 parts of 2,-methyl-4,6-bis(octylthiomethylene)phenol, 10 parts of dodecylbenzenesulfonic acid, 20 parts of siloxane and 50 parts of ethanol, and disperse them by ultrasonic Machine and sand mill disperser are combined to disperse to obtain free radical scavenger dispersion.

[0053] 2. Applying a free radical scavenger solution to the cable using a pressure injection system

[0054] Use an air compressor to compress the air so that the injection pressure is 0.3MPa. After filtering through the filter bottle, add the dispersion of the above free radical scavenger into the free radical scavenger solution tank, and the free radical scavenger solution enters the exchange tank under pressure. Joint polyethylene cable core, stop injecting after 2h.

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Abstract

The invention discloses a free-radical scavenger for resisting insulation aging of a power cable and an automatic healing method of the free-radical scavenger. The method is characterized by comprising the following steps of: uniformly mixing 10 to 20 parts of 2,-methyl-4,6-di(octylthiomethylene)phenol, 5 to 10 parts of dodecylbenzene sulfonic acid and 10 to 20 parts of siloxane repair liquid, and thus obtaining the free-radical scavenger; fully and uniformly mixing the free-radical scavenger which is uniformly mixed with 50 to 75 parts of solvent; dispersing by using an ultrasonic dispersion machine and a sanding dispersion machine together, and thus obtaining a dispersion solution of the free-radical scavenger; compressing air by using an air compressor to make injection pressure between 0.1 MPa and 0.8 MPa; and filtering in a filter bottle, adding the dispersion solution of the free-radical scavenger into a solution tank of the free-radical scavenger, injecting a free-radical scavenger solution into a cross-linked polyethylene cable core under the action of pressure for 0.5 to 4 h, and then stopping injection.

Description

technical field [0001] The invention relates to a free radical scavenger for electric cable insulation aging and an automatic healing method thereof, belonging to the technical field of cable operation and maintenance. Background technique [0002] Cross-linked polyethylene (XLPE) power cables have been widely used in urban power grids in my country because of their reliable electrical and mechanical properties. According to the statistics of State Grid Corporation of China in 2009, XLPE power cables that have been in operation for more than 10 years account for nearly 40% of the total laid cables. Insulation aging accidents occupy the second place among cable outage accidents, seriously threatening the safety of power grids. [0003] The insulation aging of operating cables does not directly lead to breakdown damage, and the aging process of cables can usually be divided into early, middle and late stages. In the early stage of aging, the running cable is only slowly oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B3/46C08L83/04C08K5/375C08K5/42H02G1/16
Inventor 周凯熊庆陶文彪万利赵威陶霰滔李旭涛
Owner SICHUAN UNIV
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