Method for determining safety of GIL shell containing buried defects and system thereof

A safety and defect technology, applied in the field of GIL shell safety, can solve problems such as GIL shell safety and remaining life evaluation

Active Publication Date: 2018-12-07
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a method and system for determining the safety of GIL shells with buried defects, so as to

Method used

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  • Method for determining safety of GIL shell containing buried defects and system thereof
  • Method for determining safety of GIL shell containing buried defects and system thereof
  • Method for determining safety of GIL shell containing buried defects and system thereof

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Experimental program
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Embodiment approach

[0147] A UHV GIL shell is made of 5754 aluminum alloy, and there are two buried cracks inside the weld seam of the conventional non-destructive testing body:

[0148] Crack 1: The crack depth is a 1 = 3mm; the crack length is 2c 1 =8mm; 2mm from the outer surface of the shell;

[0149] Crack 2: The crack depth is a 2 =2.5mm; the crack length is 2c 2 =9mm; 3mm from the outer surface of the shell;

[0150] The distance between two cracks is s=6mm;

[0151] (1) Acquisition of material properties

[0152] The same batch of 5754 aluminum alloy was used for tensile, fracture toughness and fatigue performance tests to obtain the properties of the material, as follows:

[0153] GIL shell specification: 1160*16mm.

[0154] The service condition of GIL bears 0.6MPa.

[0155] Material yield strength: 150MPa; tensile strength: 240MPa

[0156] Fracture toughness: K IC =50MPa√m

[0157] Fatigue crack growth performance: da / dN=4.34×10 -5 (ΔK) 1.2 mm / cycle

[0158] (2) GIL Shell...

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Abstract

The invention relates to a method for determining safety of a GIL shell containing buried defects, comprising the following steps: acquiring material characteristic data of a gas insulated metal enclosed transmission line GIL shell; acquiring design condition data of the GIL shell, and calculating stress data of the GIL shell; performing non-destructive testing on the GIL shell to determine existing buried defects and defect data of the buried defects; equalizing the existing buried defects to surface defects respectively, determining defect data of the surface effects according to the defectdata of the buried defects, and judging whether to combine the defects of the adjacent surface defects according to a merge strategy when there are multiple buried defects; and calculating defect stress intensity factor of each buried defect, and determining safety of the GIL shell according to the defect stress intensity factor. The accuracy of evaluation of safety and remaining life of the GIL shell containing the buried defects can be improved. The method is convenient for practical application of engineering personnel. The maintenance cost is lowered, and the technical support is providedfor the inspection and maintenance of the extra-high voltage GIL shell.

Description

technical field [0001] The present invention relates to the technical field of safety of gas-insulated metal-enclosed transmission lines, and more particularly, to a method and system for determining the safety of a GIL shell containing buried defects. Background technique [0002] Compared with conventional cables, gas insulated metal enclosed transmission lines (gas insulated metal enclosed transmission line, GIL) have significant advantages such as large transmission capacity, low loss, not affected by the environment, high operational reliability, and space saving, and are especially suitable as overhead cables. Supplementary power transmission technology in the case of limited power transmission methods or cable transmission. The shell is the basic carrier in GIL transmission, and the main body is mainly made of aluminum alloy welding. It bears the pressure of the internal insulating gas, and its welding quality directly determines the insulation performance of the tra...

Claims

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Application Information

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IPC IPC(8): G01N33/20
CPCG01N33/20
Inventor 乔亚霞王宁华张鹏飞
Owner CHINA ELECTRIC POWER RES INST
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