A method for evaluating the water tree aging degree of xlpe cable insulation layer
A technology of cable insulation and aging degree, which is applied in the direction of testing dielectric strength, using optical methods to test, and measuring electricity. It can solve problems such as cable failure, reduced tolerance, and threats to the safe operation of electrical equipment, so as to reduce operation and maintenance. Cost, effect of avoiding cable failure
Active Publication Date: 2021-08-13
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, comprising the following steps: measuring the absorbance with an infrared spectrometer, staining the water tree with methylene blue, calculating the area of the water tree by a grid counting method under a microscope, and calculating the cable insulation layer Material water tree coefficient; test the DC conductivity and dielectric loss tangent of the cable, calculate the dielectric factor of the cable insulation layer material; calculate the characterization factor of the water tree aging degree of the cable insulation layer through the water tree coefficient and dielectric factor, and realize the analysis based on the characterization factor Evaluation of water tree aging degree of cable insulation layer. The beneficial effect of the present invention is that: by integrating the non-electrical parameters and electrical parameters of the water tree in the insulating layer of the XLPE cable, it can accurately and efficiently evaluate the aging degree of the water tree in the insulating layer of the XLPE cable, and provide technical support for the detection of the water tree in the insulating layer of the XLPE cable. Avoid cable failures caused by water tree aging and reduce operation and maintenance costs.
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