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GIS shell defect detection method based on magnetostriction torsional guided waves

A magnetostriction and defect detection technology, which is applied to the magnetic variables of materials, and the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve problems such as the inability to detect the part of the shell through the wall, limited ray detection effect, and poor detection effect. Realize online monitoring and continuous tracking, improve detection effect, and fast live detection effect

Pending Publication Date: 2020-08-14
GUANGXI POWER GRID ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the detection rate of area-type defects in radiographic inspection is affected by various factors such as the transillumination angle, and the electrical equipment has been installed inside the running GIS, so the effect of radiographic inspection is limited; eddy current inspection must be scanned point by point, and the entire shell needs to be fully inspected. Volume scanning has a large workload and cannot detect the part of the GIS shell that is prone to corrosion during operation, and the eddy current field interferes with the internal electric field of the GIS, resulting in poor detection results

Method used

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  • GIS shell defect detection method based on magnetostriction torsional guided waves
  • GIS shell defect detection method based on magnetostriction torsional guided waves
  • GIS shell defect detection method based on magnetostriction torsional guided waves

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Embodiment 1

[0039] See figure 1 , figure 1 It is a schematic flow diagram of a method for detecting defects in a GIS shell based on a magnetostrictive torsion guided wave in an embodiment of the present invention.

[0040] Such as figure 1 As shown, a method for detecting GIS shell defects based on magnetostrictive torsion guided waves, the method includes:

[0041] S11: Select a position of the GIS shell, and install the excitation tape at the position;

[0042] In the specific implementation process of the present invention, selecting a position of the GIS housing and installing the excitation tape at the position includes: cutting the excitation tape with the circumference of the GIS housing and the width of the first preset value, and placing One side of the excitation tape is coated with a couplant with a thickness of a second preset value to obtain an excitation tape with a couplant; a position of the GIS housing is selected, and the excitation tape with a couplant is placed around the pos...

Embodiment 2

[0058] figure 2 Is a working schematic diagram of the detection sensor in the embodiment of the present invention; image 3 Is a schematic diagram of an A-scan image in an embodiment of the present invention; Figure 4 Is a working schematic diagram of the scanning sensor in the embodiment of the present invention; Figure 5 It is a schematic diagram of the C scan in the embodiment of the present invention.

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Abstract

The invention discloses a GIS shell defect detection method based on magnetostriction torsional guided waves. The method comprises the steps: selecting a position of a GIS shell, and installing an excitation band at the position; fixing a detection type sensor to the excitation band, and carrying out defect overall screening on the GIS shell through the detection type sensor; and accurately positioning the defects of the GIS shell along the surface of the excitation band by using a scanning sensor. In the embodiment of the invention, the problems of complicated instrument operation steps, lowdetection sensitivity and difficulty in accurately positioning the defects are solved, and the electrified detection of the defects of the GIS shell is realized.

Description

Technical field [0001] The invention relates to the technical field of non-destructive testing of power equipment, and in particular to a method for detecting defects in a GIS shell based on magnetostrictive torsion guided waves. Background technique [0002] Gas-insulated fully enclosed combined electrical appliances (hereinafter referred to as GIS) all enclosed various high-voltage electrical appliances such as circuit breakers, disconnectors, grounding switches, busbars, etc., inside the metal shell, and filled with a certain pressure of sulfur hexafluoride gas as insulation and Arc extinguishing medium. Once the internal sulfur hexafluoride gas leaks due to the defect of the GIS shell, it will seriously affect the reliable operation of the power system, and it will also pollute the surrounding environment and endanger the health and life safety of the staff. [0003] At present, the common nondestructive testing of metal structure defects mainly include radiographic testing an...

Claims

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Application Information

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IPC IPC(8): G01N29/07G01N29/04G01N27/82
CPCG01N29/07G01N29/04G01N27/82
Inventor 梁沁沁林朝扶张龙飞
Owner GUANGXI POWER GRID ELECTRIC POWER RES INST
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