Method for detecting aging degree of insulator sample

A detection method and technology of insulators, which are applied in the direction of analysis using nuclear magnetic resonance, etc., can solve the problems of stray magnetic field influence and uneven magnetic field uniformity.

Active Publication Date: 2014-02-05
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0003] The invention provides a method for detecting the aging degree of insulator samples, which solves the technical problems that the magnetic field uniformity of th

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  • Method for detecting aging degree of insulator sample
  • Method for detecting aging degree of insulator sample
  • Method for detecting aging degree of insulator sample

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Embodiment Construction

[0018] An insulator sample aging detection device, comprising a tested insulator sample 17, a detection coil 15, 12 cube-shaped magnet sub-modules 1 with the same magnetization direction and magnetization intensity, and 12 cube-shaped magnet sub-modules 1 with the same volume They are evenly distributed on the same circle at equal arc intervals. If the magnetization direction X of one of the cube-shaped magnet sub-modules 1 is selected as a reference, on the same circle, the cube-shaped magnets arranged in a clockwise direction The magnetization direction of the sub-module rotates 60 degrees in the clockwise direction sequentially. A detection coil 15 is arranged at the center of the same circle where the 12 cube-shaped magnet sub-modules 1 are evenly distributed. At the center of the detection coil 15 The insulator sample 17 to be detected is arranged on the shaft, one end of the detection coil 15 is grounded, the other end of the detection coil 15 is connected to one end of t...

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Abstract

The invention discloses a method for detecting the aging degree of an insulator sample and solves the problem of low magnetic field uniformity of an existing insulator aging degree magnetic resonance detection magnet. The method comprises the following steps: selecting twelve cubic magnet sub-modules (1) with the same size and the same magnetic material, and magnetizing, wherein all cubic magnet sub-modules are the same as one another in terms of magnetizing strength and magnetizing direction; uniformly distributing the twelve cubic magnet sub-modules on the same circumference at intervals with equal radian, arranging a detection coil (15) in the circle center of the same circumference on which the twelve cubic magnet sub-modules are uniformly distributed, detecting and analyzing a signal in the detection coil, electromagnetically exciting the insulator sample, and processing a generated magnetic resonance induction decay signal through a pre-amplifier, a frequency mixer and an analog-to-digital converter in sequence; and observing and analyzing parameters such as the height of each characteristic spectral line on a spectral graph, and comparing the parameters with standard data to judge the aging degree of an insulator.

Description

technical field [0001] The invention relates to a magnetic resonance permanent magnet detection method for detecting the relaxation characteristics of an insulator sample, in particular to a detection method for detecting the aging degree of an insulator sample. Background technique [0002] The main component of conventional silicone rubber composite insulators is polydimethylsiloxane, whose molecules are composed of repeated silicon-oxygen bonds Si-O as the main chain, and Si atoms are directly connected to polymers such as methyl groups and vinyl groups, surrounding Si- The non-polar methyl groups closely arranged in the main chain of O are oriented toward the surface, shielding the strong polarity of Si-O, and making the surface of silicone rubber exhibit better hydrophobicity. Affected by the harsh external environment or corona discharge, etc., the insulator will age, causing some groups connected to the main chain Si atoms to fall off, and the state of the contained h...

Claims

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Application Information

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IPC IPC(8): G01N24/08
Inventor 张来福刘国强李晓南高鹏王琪
Owner STATE GRID CORP OF CHINA
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