Continuous nondestructive testing device for local defects of superconducting cable

A technology for superconducting cables and local defects, applied in the direction of material magnetic variables, can solve the problems of uneven residual magnetic field, inability to detect local defects in superconducting cables, etc., to achieve the effect of ensuring performance and reliability

Pending Publication Date: 2018-09-04
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As for the superconducting cable, because it is formed by multi-level twisting of superconducting strands, when the superconducting cable passes through the Hall sensor next to it continuously, the cross-section of the closest superconducting part is not the same, but a continuous torsion (rotation ) changes in a non-circular shape; therefore, the residual magnetic field continuously measured by the Hall sensor is not uniform, but will produce large fluctuations; thus it will cover up the residual magnetic field changes caused by local defects, and cannot detect the superconducting cable. local defect

Method used

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  • Continuous nondestructive testing device for local defects of superconducting cable

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Embodiment

[0018] figure 1 It is shown that a specific embodiment of the present invention is a continuous non-destructive testing device for local defects of superconducting cables, which is characterized by:

[0019] The pay-off reel 1 and the take-up reel 9 are respectively installed on the upper left and upper right of the Dewar 3, the shaft of the pay-off reel 1 is connected with the damper 2, and the shaft of the take-up reel 9 is connected with the stepping motor;

[0020] Guide wheel 4, excitation coil 5, magnetic field detector 6, guide wheel 2 7 are installed in Dewar 3 from left to right; the magnetic field detector 6 has four rows of front, rear, upper and lower Hall Halls. Square Hall sensor array composed of sensors;

[0021] After the superconducting cable 8 on the pay-off wheel 1 is extended, it first goes around the guide wheel 4, then passes through the center of the excitation coil 5 and the magnetic field detector 6 in turn, then goes around the guide wheel 7 and finally wi...

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Abstract

The invention discloses a continuous nondestructive testing device for local defects of a superconducting cable. The continuous nondestructive testing device is characterized in that a pay-off wheel and a take-up wheel are respectively arranged above the left and right sides of a Dewar, the shaft of the pay-off wheel is connected with a damper, and the shaft of the take-up wheel is connected witha stepping motor; the Dewar is internally provided with a guide wheel, excitation coils, a magnetic field detector and a guide wheel 2 from left to right; the magnetic field detector is a square Hallsensor array consisting of four rows, i.e., a front row, a rear row, an upper row and a lower row, of Hall sensors; after a superconducting cable on the pay-off wheel extends out, the superconductingcable bypasses the guide wheel I, then successively passes through the centers of the excitation coils and the magnetic field detectors, then bypasses the guide wheel 2, and is finally wound around the take-up wheel. The continuous nondestructive testing device can realize continuous nondestructive detection of the local defects of the superconducting cable, so reliable test data is provided for the formulation of a cable stranding process for the superconducting cable and the use and maintenance of the superconducting cable; and thus, the performance and reliability of a superconducting magnet are guaranteed.

Description

Technical field [0001] The invention relates to a detection device for a superconducting cable. Background technique [0002] Large superconducting magnets can provide a strong magnetic field in a large space without consuming electricity, and have been widely used in high-energy ion accelerators, nuclear fusion, and magnetic fluid power generation. Superconducting magnets are mainly composed of Cable-in-Conduit Conductor (CICC) winding. The cable conductor in the tube is composed of a superconducting cable formed by multi-stage twisting of superconducting strands, a central cooling hole and an outer tube. Among them, the performance of the superconducting cable directly determines whether the prepared magnet can operate normally and the strength of the magnetic field generated by the superconducting magnet. During the twisting process of the superconducting cable, the superconducting strands may be subjected to different degrees of stress, which will cause local defects in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/83
CPCG01N27/83
Inventor 羊新胜李建刚陈炜赵勇
Owner SOUTHWEST JIAOTONG UNIV
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