Cable joint lead sealing part pulsed eddy current detection device and application method thereof

Abstract

The invention discloses a cable joint lead sealing part pulsed eddy current detection device and an application method thereof. The cable joint lead sealing part pulsed eddy current detection device comprises a signal generator, an eddy current detection probe, a data acquisition and processing module and a control module, the control end of the signal generator is connected with the control module, and an excitation coil and a detection coil are arranged in the eddy current detection probe, the output end of the signal generator is connected with the excitation coil; the output end of the detection coil is connected with the control module through the data acquisition and processing module; the application method of the device comprises the steps that all-directional pulsed eddy current detection on the lead sealing part of the cable joint is achieved in the circumferential movement direction and the longitudinal movement direction, and the amplitude variation of induced voltage serves as the judgment reference of cracks. According to the invention, surface and near surface defect detection of the lead sealing part of the high-voltage cable joint can be realized, and the device has the characteristics of relatively high detection accuracy and sensitivity, relatively strong anti-interference capability, small size, convenience in operation and the like, and is particularly suitable for realizing crack type potential safety hazards with intact shapes existing in the cable joint.

Description

technical field [0001] The invention relates to the technical field of cable nondestructive flaw detection in electric power systems, in particular to a pulsed eddy current detection device for a cable joint seal and an application method thereof. Background technique [0002] Lead seal is one of the key processes in the production of high-voltage cable accessories. Once cracks occur due to unqualified installation quality or factors such as tension and vibration during operation, it is easy to cause the accessories to get wet or have poor electrical connections, which will cause high-voltage cable line fault trips. At present, there is little research on the state detection technology of high-voltage cable seals. The construction quality of lead seals cannot be directly detected after the accessories are made, and the state of lead seals cannot be detected during operation. The detection of lead seal defects has become a problem that plagues the safe operation of high-voltag...

AI Technical Summary

Problems solved by technology

For such tiny defects, the traditional eddy current testing technology cannot achieve the detection goal

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