A multi-phase combined detection method for the thermal aging dynamic process of xlpe materials
A dynamic process, combined detection technology, applied in the direction of thermal analysis of materials, analytical materials, measurement devices, etc., can solve the problems of XLPE material molecular weight crosslinking degree reduction, failure, chemical bond breaking and other problems
Inactive Publication Date: 2022-05-17
SOUTH CHINA UNIV OF TECH +1
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Problems solved by technology
The thermal aging process of XLPE cable insulation materials is the effect of heat on the material molecules to cause the breakage of chemical bonds, resulting in the reduction of the molecular weight and cross-linking degree of XLPE materials, resulting in the aging of XLPE and even insulation failure.
At present, the description of the dynamic process of XLPE aging is the change of XLPE material properties with aging time, and there is little analysis of the aging process from the elements of the material and the decomposed substances.
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[0032] The present invention will be described in further detail below with reference to the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
[0033] like figure 1 As shown, a multi-phase joint detection method for the dynamic process of thermal aging of XLPE materials comprises the following steps:
[0034] S1. Prepare XLPE test pieces according to the common formula of cables. In order to accelerate the thermal aging process, aging is carried out at a temperature of 160°C-200°C. The aging time is 0h, 6h, 12h, 18h, 24h and 30h, and one piece is taken out every 6h. A group of XLPE samples and a bag of gas, each group of XLPE samples contains 3 pieces of XLPE test pieces; keep the sample size the same, the length, width and thickness of the XLPE samples are 30mm×30mm×1mm;
[0035] S2. After cooling to room temperature for 24 hours, perform Fourier transform infrared spectroscopy analysis on the XLPE samples under...
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The invention discloses a multi-phase combined detection method for the thermal aging dynamic process of XLPE materials, comprising steps: S1, preparing aged XLPE test pieces and gas; S2, performing Fourier transform infrared spectrum analysis on the XLPE samples after cooling to room temperature Obtain the Fourier transform infrared spectrum curve; S3, draw the change curve of C, O and H element element intensity with the aging time; S4, determine the gas type released during the aging process by gas chromatography analysis, and obtain the change curve of the gas content with the aging time ; S5. Determine the change curve of the crystallization region content in the material at each aging stage; S6. Determine the change curve of the crystallization melting enthalpy of the material and the melting start temperature with the aging time; S7. Infer the aging mechanism of the XLPE material according to the obtained change curve. The invention includes gas phase analysis, solid phase analysis and crystal phase analysis in the aging process, and can comprehensively reflect the material decomposition mechanism of the XLPE aging process.
Description
technical field [0001] The invention relates to the monitoring of XLPE aging state and the dynamic process of aging development, in particular to a multi-phase combined detection method for the thermal aging dynamic process of XLPE materials. Background technique [0002] Cross-linked polyethylene (XLPE) material is widely used in the insulation part of EHV power cables due to its good heat resistance, electrical properties and mechanical strength. With the increasing complexity of the cable laying environment in my country, the dynamic monitoring of the aging process of XLPE insulation materials under complex conditions has become particularly important. [0003] The aging of cable insulation material after long-term operation is one of the main reasons for XLPE cable damage. The heat aging process of XLPE cable insulation material is the effect of heat on the material molecules to break the chemical bond, resulting in the reduction of the molecular weight and crosslinking...
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IPC IPC(8): G01N25/00
CPCG01N25/00
Inventor 谢从珍王瑞张福增徐华松王婷婷苟彬骆守康
Owner SOUTH CHINA UNIV OF TECH