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A method for evaluating the insulation state of XLPE cables based on multi-scale aging factors

A cross-linked polyethylene, aging factor technology, applied in the direction of measuring electricity, measuring electrical variables, testing dielectric strength, etc., can solve problems such as insulation degradation and affecting the safe and reliable operation of cross-linked polyethylene cables

Active Publication Date: 2022-07-08
SOUTHWEST JIAOTONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0002] XLPE cables are widely used in urban power supply and distribution networks. Under the action of various stresses such as mechanical stress, electrical stress and thermal stress during long-term operation, XLPE cables will cause insulation degradation and affect crosslinking. Safe and reliable operation of polyethylene cables

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  • A method for evaluating the insulation state of XLPE cables based on multi-scale aging factors
  • A method for evaluating the insulation state of XLPE cables based on multi-scale aging factors
  • A method for evaluating the insulation state of XLPE cables based on multi-scale aging factors

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Embodiment Construction

[0028] figure 1 It is a flow chart of a method for evaluating the insulation state of XLPE cables based on multi-scale aging factors. figure 1 It can be seen that a method for evaluating the insulation state of XLPE cables based on multi-scale aging factors includes the following steps:

[0029] Step 1: Perform insulation aging simulation on XLPE cable samples:

[0030] The new 10kV XLPE cable was cut into 500mm short XLPE cable segments, a total of 50 pieces were used as samples, the XLPE cable samples were processed, the outer sheath and shielding layer were stripped, and the XLPE cable samples were removed. Place in a dry aging box and apply AC 10kV rated voltage for electric-thermal combined aging, wherein the aging time is t={0,128,256,512,1024}, unit: h;

[0031] Step 2: Carry out the elongation at break test, leakage current test and partial discharge test on the XLPE cable sample to obtain the elongation at break, leakage current and partial discharge amount of the X...

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Abstract

The invention is a method for evaluating the insulation state of cross-linked polyethylene cables based on multi-scale aging factors. The first step of the invention is to simulate the insulation aging of the cross-linked polyethylene cable samples; the second step is to break the cross-linked polyethylene cable samples. Elongation test, leakage current test and partial discharge test; the third step calculates the mechanical aging factor and electrical aging factor of the XLPE cable sample; the fourth step calculates the multi-scale aging factor of the XLPE cable sample; the fifth step The insulation state of the XLPE cable samples was evaluated according to the multi-scale aging factor, which laid the foundation for ensuring the safe and reliable operation of the XLPE cable.

Description

technical field [0001] The invention belongs to the field of cross-linked polyethylene cable insulation state evaluation, in particular to a cross-linked polyethylene cable insulation state evaluation method based on a multi-scale aging factor. Background technique [0002] XLPE cables are widely used in urban power supply and distribution networks. In the long-term operation of XLPE cables, under the action of various stresses such as mechanical stress, electrical stress and thermal stress, insulation deterioration will occur, affecting cross-linking. Safe and reliable operation of polyethylene cables. [0003] Therefore, the mechanical aging factor and electrical aging factor of XLPE cable samples were calculated by performing insulation aging simulation on XLPE cable samples, elongation at break testing, leakage current testing and partial discharge testing on XLPE cable samples. Aging factor, calculate the multi-scale aging factor of the XLPE cable sample, evaluate the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 郭蕾穆强张祥宇
Owner SOUTHWEST JIAOTONG UNIV