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Method for judging aging state of cross linked polyethylene (XLPE) cable insulation water tree

A technology of cable insulation and aging state, which is applied in the direction of testing dielectric strength, etc.

Inactive Publication Date: 2012-11-14
CHINA ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A kind of test methods such as dielectric spectrum, infrared spectrum, differential scanning calorimetry, etc., to comprehensively analyze the aging degree of cable insulation water tree from the perspectives of dielectric loss peak, low-frequency conductance, lamella thickness change and group disappearance. Evaluation and diagnosis, no related reports

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  • Method for judging aging state of cross linked polyethylene (XLPE) cable insulation water tree
  • Method for judging aging state of cross linked polyethylene (XLPE) cable insulation water tree
  • Method for judging aging state of cross linked polyethylene (XLPE) cable insulation water tree

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Embodiment Construction

[0023] Embodiments of the invention will be further described below in conjunction with the accompanying drawings: figure 1 ~ attached Figure 7 , a method for judging the water tree aging state of XLPE cable insulation in the present invention is to comprehensively evaluate the water tree aging degree of the cable insulation by testing the dielectric loss peak, low-frequency conductance, lamella thickness change and group disappearance data of the cable insulation and diagnostic method, wherein the operation process of testing the dielectric loss peak, low-frequency conductance, lamellar thickness variation and group disappearance data of the cable insulation is as follows:

[0024] ⑹ Sample selection: Select three types of cables: unaged, aged for 120 days and aged for 180 days, and cut the insulating sheets on the cables as samples, and name them A, B and C;

[0025] ⑺ Calculation of activation energy: put the three samples of A, B and C in an environment with a temperatur...

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Abstract

The invention relates to a method for comprehensively accessing and diagnosing aging degree of a cable insulation water tree by testing data such as insulation dielectric loss peak, low frequency conductivity, lamella thickness change and group disappearance of a cable. The method can accurately judge insulation performance of a cross linked polyethylene (XLPE) cable from the microscopic view, and especially can effectively access insulation aging state of the cable producing the water tree. The aging degree of the cable insulation water tree is high when a cable insulation test sample has the following characteristics: the activation energy corresponding to the loss peak a at a low frequency position is appropriately equal to 0.14eV, the change of the electric conductivity of low frequency of 0.1Hz s is largest along with the aging time, the methyl group value cannot be observed at the position of 2700cm<-1>, the lamella thickness is smaller than 54.34*10-10m, and the like.

Description

technical field [0001] The invention relates to a method for judging the aging state of XLPE cable insulation water trees, which belongs to the technical field of power system measurement. Background technique [0002] Cross-linked polyethylene (XLPE) cables are widely used in power transmission networks. In a dry environment, the electrical and mechanical properties of this cable insulation are very superior, but in a humid environment, due to the rapid aging of the insulating material water tree, it enters the aging period ahead of time. For the cables in operation, it is very necessary to use an accurate identification method to determine their aging degree, which is conducive to the safe and economical operation of the system. The Chinese invention patent "A Method for Testing the Starting Point of Water Tree Phenomena in Cable Main Insulator" (Application No.: 200710171889.X) provides a method for testing the number of starting points of water tree phenomenon in the ma...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 欧阳本红赵健康饶文彬邓显波
Owner CHINA ELECTRIC POWER RES INST
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