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Characterization method for aging of cross-linked polyethylene insulation materials for submarine cables

A technology of cross-linked polyethylene and insulating materials, applied in measuring devices, instruments, etc., can solve the problem of limited aging samples and achieve the effect of ensuring safety and reliability

Active Publication Date: 2019-08-30
CHONGQING UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above research has strong requirements for experimental samples and data volume. For 500 kV XLPE submarine cables, aging samples are limited, and there is currently no 500 kV in-service cable for data analysis, which makes the above methods have certain limitations

Method used

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  • Characterization method for aging of cross-linked polyethylene insulation materials for submarine cables
  • Characterization method for aging of cross-linked polyethylene insulation materials for submarine cables
  • Characterization method for aging of cross-linked polyethylene insulation materials for submarine cables

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Embodiment

[0087] Refer to the flowchart of the method for characterizing the aging of the cross-linked polyethylene insulation material for submarine cables provided by the embodiments of the present invention figure 1 As shown, it is realized through the following five steps:

[0088] (1) Preparation of XLPE samples with different aging degrees at 130℃

[0089] For the flow chart of preparing XLPE samples with different aging degrees at 130°C in the examples of the present invention, see figure 2 As shown; take a new cable to strip the sheath and water-blocking layer, cut the insulation layer, and select the insulation layer of the new cable as the raw material to prepare samples; prepare a 2mm thick dumbbell-shaped sample according to GB / T 528 for machinery Test; Prepare 1mm thick rectangular samples for chemical and electrical testing; place the dumbbell-shaped samples and rectangular samples in a vacuum drying oven at the same time, and perform 48h degassing and drying treatment at 80°C...

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Abstract

The present invention discloses a characterization method for aging of cross-linked polyethylene insulation materials for submarine cables. The method comprises following steps: a) respectively performing mechanical, chemical, thermal and electrical performance tests on the cross-linked polyethylene insulation materials of different aging degrees, and obtaining a changing rule of each characteristic parameter along with the aging degree; and further dividing aging intervals, and establishing a reference sequence according to characteristic parameters corresponding to threshold points of different stages in the aging intervals; b) performing the same performance test as the step a) on the cross-linked polyethylene insulating materials at an unknown aging state, and establishing a to-be-matched sequence through using obtained characteristic parameters; and c) calculating correlation degree between the to-be-matched sequence established in the step b) and the reference sequence established in the step a), matching the aging intervals, and determining the aging degree of the materials. The characterization method combines multiple characteristic parameters of physical and chemical properties, combines with more scientific aging interval division and more accurate correlation calculation, and can comprehensively and accurately reflect aging state of the materials.

Description

Technical field [0001] The invention relates to the technical field of detection and analysis of cross-linked polyethylene submarine cables, and more specifically, to a method for characterizing the aging of cross-linked polyethylene insulation materials for submarine cables. Background technique [0002] Cross-linked polyethylene (XLPE) insulated submarine power cables have been widely used in large-scale projects that supply electricity from the mainland to offshore islands. my country has vast sea areas and long coastlines, and coastal islands need to use submarine power cables to connect to the mainland's main grid to ensure power supply and improve grid operation stability. Among them, the Zhoushan 500kV interconnected power transmission and transformation project is the world's first AC 500kV polyethylene insulated submarine cable project, and it is also the polyethylene insulated submarine cable project with the highest voltage level. Its cross-linked polyethylene submarin...

Claims

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Application Information

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IPC IPC(8): G01D21/02
CPCG01D21/02
Inventor 郝建高震李捍平刘智谦胡文侃彭维龙卢正通廖瑞金杨丽君
Owner CHONGQING UNIV
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