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Method for intelligently repairing insulating water tree of crosslinked polyethylene power cable

A cross-linked polyethylene and cable insulation technology, applied in the direction of insulation/armored cable repair equipment, etc., can solve the problems of great differences in repair effects and achieve the effect of filling water tree defects

Inactive Publication Date: 2013-03-27
SOUTHWEST JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of a relatively fixed ratio, the repair effect varies greatly when the cable water branches are different.

Method used

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  • Method for intelligently repairing insulating water tree of crosslinked polyethylene power cable
  • Method for intelligently repairing insulating water tree of crosslinked polyethylene power cable
  • Method for intelligently repairing insulating water tree of crosslinked polyethylene power cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Test water tree aging cable insulation dielectric loss tangent tanδ 1 : Take a 5-meter water tree aging cable as a sample, connect the high-voltage HV connector of the dielectric loss tester to the cable conductor, connect the Cx connector to the metal shielding layer of the cable, and control the insulation temperature of the cable with a temperature controller. Choose 0.5U 0 The dielectric loss tangent tanδ of the cable insulation temperature at 20°C is obtained from the test voltage test 1 = 0.68%.

[0051] Test the dielectric loss tangent tanδ of the water tree aging cable after it is fully dried 2 : Cut out a 5-meter-long water tree aging cable, put it in a drying box, fill the cable conductor with dry air at 75°C to dry the cable insulation water tree, and test the cable insulation dielectric loss every 8 hours Angle tangent tanδ, where the cable insulation dielectric loss tangent test method: connect the high-voltage HV connector of the dielectric loss tester ...

Embodiment 2

[0068] Test water tree aging cable insulation dielectric loss tangent tanδ 1 : Take a 5-meter water tree aging cable as a sample, connect the high-voltage HV connector of the dielectric loss tester to the cable conductor, connect the Cx connector to the metal shielding layer of the cable, and control the insulation temperature of the cable with a temperature controller. Use U 0 The dielectric loss tangent tanδ of the cable insulation temperature at 20°C is obtained from the test voltage test 1 = 4.75%.

[0069] Test the dielectric loss tangent tanδ of the water tree aging cable after it is fully dried 2 : Cut out a 5-meter-long water tree aging cable, put it in a drying box, fill the cable conductor with dry air at 85°C to dry the cable insulation water tree, and test the cable insulation dielectric loss every 8 hours Angle tangent tanδ, where cable insulation dielectric loss tangent test method: connect the high-voltage HV connector of the dielectric loss tester to the cab...

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Abstract

The invention discloses a method for intelligently repairing an insulating water tree of a crosslinked polyethylene power cable. The method is characterized by comprising the steps of determining the proportion of all ingredients of a repairing liquid according to a test value of dielectric loss angle tangent caused by the insulating water tree of the cable and injecting the prepared repairing liquid into the cable. The method has the advantages of being good in repairing effect and low in cost.

Description

technical field [0001] The invention relates to an intelligent repair method for insulating water trees of cross-linked polyethylene power cables. The technology is used for intelligent repair of water tree aging cross-linked polyethylene power cables, and belongs to the field of repairing cross-linked polyethylene power cables. Background technique [0002] XLPE power cables have good electrical and mechanical properties, and have been widely used in my country's power systems since the 1970s. Due to the internal microscopic defects of the cable insulation caused by XLPE cables during the production, transportation, installation, etc., water branches are formed at the microscopic defects under the joint action of moisture and electric field. The water tree branches develop in the cable insulation along the direction of the electric field to form many forked branches. Because the water tree branches will crack the insulating polymer chain, when the water tree in the cable in...

Claims

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Application Information

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IPC IPC(8): H02G1/16
Inventor 周利军邝振星何国华李波蔡子强陈剑明阮国恒赵赢峰
Owner SOUTHWEST JIAOTONG UNIV
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