Supersonic crack detecting method of pillar porcelain insulator and probe thereof

A pillar porcelain insulator, flaw detection technology, applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, etc., can solve problems such as the decrease of probe sensitivity, and achieve the effects of improving detection sensitivity and detectability, small attenuation, and improved detection distance.

Active Publication Date: 2007-04-18
EAST CHINA ELECTRIC POWER TEST & RES INST +2
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Problems solved by technology

Tests have shown that for post insulators of different specifications, if the axial dimension of the probe is ≤15mm, the detection rate of the porcelain bottle will reach 80%, but the result of this is that the probe has to be manufactured with a small chip, so the sensitivity of the probe is greatly reduced, especially The effective detection range of the creeping wave probe is even lower than 15mm

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  • Supersonic crack detecting method of pillar porcelain insulator and probe thereof

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Embodiment Construction

[0029] The ultrasonic flaw detection method of the post insulator of the present invention adopts the following equipment:

[0030] Type A pulse reflection ultrasonic flaw detector, which is an existing instrument;

[0031] The ceramic insulator SH ultrasonic special probe (single crystal or double crystal) of the present invention;

[0032] Porcelain insulator test block, the test block is an important part of ultrasonic testing, which plays the role of testing the performance of the probe, adjusting the sensitivity, and determining the evaluation standard. The main defects detected are cracks, and the sensitivity of the system is adjusted by using the acoustic wave reflector on the test block. The material of the test block is: ordinary porcelain, high-strength porcelain.

[0033] There should be inspection preparations before the inspection, and the ultrasonic flaw detection of porcelain insulators is carried out when the line is out of service. The adhesive fittings of ...

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Abstract

The invention discloses brace porcelain insulator ultrasonic flaw detection method. It includes the following steps: emitting SH wave to detected surface; using transversal wave couplant for the probe and the detected surface; using the probe to check the detected surface; using porcelain insulator test piece to adjust probe reference sensitivity and checking sensitivity; detecting the reflection wave of the detected surface, recording the one which reaches defect setting value as defect signal; measuring the defect length; judging the work piece recorded with defect signal as waste. The invention also discloses the defect detecting probe of which emitted ultrasonic is SH type transverse wave. The method has high sensitivity, reliability, and large detecting range. Meanwhile the special probe has little size which can ensure detecting sensitivity and increase porcelain vase retrievable rate at the same time.

Description

technical field [0001] The invention relates to an ultrasonic flaw detection method and a probe of a post insulator, in particular to an SH-type transverse wave ultrasonic flaw detection method of a post insulator and a probe specially used for the method. Background technique [0002] Porcelain pillar insulators are important components of substations and power plants. In recent years, there have been frequent accidents in China due to the breakage of porcelain pillar insulators. It may not only cause serious power grid accidents, affect the safety of power supply, but also affect the personal safety of operators and maintenance personnel. constitutes a major hidden danger to the safe operation of the circuit system. Therefore, in order to prevent the pillar porcelain insulators in operation from breaking suddenly and ensure the safe and reliable operation of the pillar porcelain insulators, domestic research has focused on ultrasonic testing technology for pillar porcelain...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/12G01N29/04
Inventor 严晓东
Owner EAST CHINA ELECTRIC POWER TEST & RES INST
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