Method for evaluating water tree aging degree of XLPE cable insulation layer
A technology of cable insulation and aging degree, applied in the direction of testing dielectric strength, using optical methods for testing, measuring electricity, etc., can solve the problems of cable failure, reduced tolerance, threatening the safe operation of electrical equipment, etc., to reduce operation and maintenance Cost, effectiveness of avoiding cable failures
Active Publication Date: 2021-03-26
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
Due to the introduction of moisture in the production process or defect points of XLPE cables, water trees appear inside the insulating layer material under the action of the electric field, which makes the electric field inside the cable concentrated and the endurance capacity is reduced. Under certain conditions, it can be transformed into an electric tree and cause cable failure. , a serious threat to the safe operation of various electrical equipment
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[0024] The present invention will be further described below in conjunction with the drawings and specific implementation process.
[0025] figure 1 Flowchart for the evaluation method of water tree aging degree of XLPE cable insulation layer, by figure 1 It can be seen that a method for evaluating the water tree aging degree of an XLPE cable insulation layer comprises the following steps:
[0026] Step 1: Measure the absorbance and water tree area of the cable sample
[0027] Select the cable insulation layer material with the actual running days of 50, 100, 150, ..., t as the test sample, t is the running time, the unit is day, t∈[50,50n], n takes a positive integer; use an infrared spectrometer to measure the absorbance , denoted as W 1 ,W 2 ,...,W n ;Use methylene blue to stain the water tree, observe under the microscope and approximate the area of the water tree by grid counting method, denoted as S 1 ,S 2 ,...,S n , unit: μm 2 ;
[0028] Step 2: Calculate ...
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The invention relates to a method for evaluating the water tree aging degree of an XLPE cable insulation layer. The method comprises the following steps: using an infrared spectrometer to measure absorbance, using methylene blue to dye a water tree, using a grid counting method to calculate a water tree area under a microscope, and calculating a cable insulation layer material water tree coefficient; testing the direct current conductivity and the dielectric loss tangent value of the cable, and calculating the dielectric factor of the cable insulating layer material; and calculating a characterization factor of the water-tree aging degree of the cable insulation layer through the water-tree coefficient and the dielectric factor, and evaluating the water-tree aging degree of the cable insulation layer based on the characterization factor. The method has the advantages that non-electrical parameters and electrical parameters of the XLPE cable insulation layer water tree are integrated, the aging degree of the XLPE cable insulation layer water tree can be accurately and efficiently evaluated, technical support is provided for water tree detection of the XLPE cable insulation layer, cable faults caused by water tree aging are avoided, and the operation and maintenance cost is reduced.
Description
technical field [0001] The invention belongs to the field of cable insulation aging state evaluation, in particular to a method for evaluating the water tree aging degree of an XLPE (cross-linked polyethylene) cable insulation layer. Background technique [0002] Cross-linked polyethylene is widely used in cable insulation due to its good electrical properties, thermal and mechanical properties, convenient installation and maintenance, and simple structure. Due to the introduction of moisture in the production process or defect points of XLPE cables, water trees appear inside the insulating layer material under the action of the electric field, which makes the electric field inside the cable concentrated and the endurance capacity is reduced. Under certain conditions, it can be transformed into an electric tree and cause cable failure. , a serious threat to the safe operation of various electrical equipment. [0003] In order to accurately, effectively and conveniently eval...
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IPC IPC(8): G01R31/12G01R27/26G01R27/02
CPCG01R27/02G01R27/2694G01R31/1218G01R31/1272
Inventor 周利军刘聪杨涵
Owner SOUTHWEST JIAOTONG UNIV