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High-voltage cable lead seal eddy current flaw detection device and method

An eddy current flaw detection and cable lead technology, which is used in measuring devices, material analysis by electromagnetic means, instruments, etc., can solve the problem of no detection method for lead seals, and achieve good detection sensitivity, convenient implementation, and small differences.

Pending Publication Date: 2018-05-15
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, there is no special detection method for lead seals of high-voltage cables. It mainly refers to the detection of sheath grounding current and contact voltage. Only when the lead seal is completely broken can it be detected.

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  • High-voltage cable lead seal eddy current flaw detection device and method
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  • High-voltage cable lead seal eddy current flaw detection device and method

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Embodiment Construction

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments of the present invention are only part of the embodiments of the present invention, not all of them. . Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0028] see figure 1 , which shows a schematic diagram of the eddy current flaw detection method for high-voltage cable lead seals of the present invention.

[0029] It can be seen from the figure that the eddy current flaw detection device includes a probe, a signal transmitter and a processor and a computer system. The signal transmitter and processor include a vibrator that provides an alternating current and an eddy c...

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Abstract

The invention discloses a high-voltage cable lead seal eddy current flaw detection device and method. No effective detection method for a high-voltage cable lead seal defect is provided at the present. Only when the lead seal is broken completely, the breakage can be detected by mainly referring to live detection of grounding current and contact voltage of a sheath. The high-voltage cable lead seal eddy current flaw detection device disclosed by the invention comprises a probe, a signal emission and processor and a computer system. The signal emission and processor comprises a vibrator for providing alternating current and an eddy current meter for picking up a signal; the probe comprises a coil; the signal emission and processor provides the alternating current for the probe to enable thecoil of the probe to generate an alternating magnetic field and induce eddy current at the lead seal position; a fed back eddy current signal is picked up, analyzed and processed by the eddy currentmeter; the processed signal is displayed through the computer system. According to the high-voltage cable lead seal eddy current flaw detection device, the lead seal sheath is not required to be stripped off, so that the operation is convenient, and the detection is fast; the high-voltage cable lead seal eddy current flaw detection device is high in detection sensitivity.

Description

technical field [0001] The invention relates to the field of non-destructive testing technology and structural health testing of power transmission equipment, in particular to a high-voltage cable lead seal eddy current flaw detection device and method. Background technique [0002] Lead sealing is one of the key processes in the production of high-voltage cable accessories. It electrically connects the copper shell or tailpipe of the accessory with the aluminum sheath of the cable, and at the same time plays a role of sealing and waterproofing. Once the lead seal cracks, the accessories will be flooded with moisture, which can easily cause breakdown failure. Therefore, the integrity of the lead seal has become an important indicator for the safe and stable operation of high-voltage cables. [0003] Conventional non-destructive testing techniques include magnetic flux leakage testing, ultrasonic testing, machine vision testing, loop resistance testing, X-ray testing, etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/90
CPCG01N27/9006
Inventor 曹俊平刘浩军江航王少华蒋愉宽杨勇于淼任广振刘伟浩杨先进赵明
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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