Polarization-depolarization current detection device for crosslinked polyethylene medium-voltage cable

A current detection device, cross-linked polyethylene technology, applied in the direction of using digital measurement technology to measure and test the dielectric strength, can solve the problem of low accuracy of polarization-depolarization current, achieve high current detection accuracy, Strong anti-interference ability and simple test process

Active Publication Date: 2014-01-29
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a polarization-depolarization current detection device for cross-li

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  • Polarization-depolarization current detection device for crosslinked polyethylene medium-voltage cable
  • Polarization-depolarization current detection device for crosslinked polyethylene medium-voltage cable
  • Polarization-depolarization current detection device for crosslinked polyethylene medium-voltage cable

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0024] The polarization-depolarization current detection device for cross-linked polyethylene medium-voltage cables provided by the present invention has strong anti-interference ability, simple test process, non-destructive, high current detection accuracy, and provides reliable information for later analysis and judgment of cable aging degree. Data; The test system is light in structure, easy ...

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Abstract

The invention discloses a polarization-depolarization current detection device for a crosslinked polyethylene medium-voltage cable. The device comprises a high-voltage loop module, a current measurement module and a data processing module. A high-voltage output end of the high-voltage loop module is used for connecting with a cable core of the crosslinked polyethylene cable and is used for producing cable polarization-depolarization current. An input end of an electric block is used for connecting with a metallic shield layer of the crosslinked polyethylene cable, and is used for detecting size of polarization-depolarization current of the crosslinked polyethylene cable. The data processing module is used for displaying and storing the polarization-depolarization current. Since the high-voltage loop module is adopted, the polarization-depolarization current is produced for the cable under different voltage grades, a high-voltage high-resistance relay unit is used for preventing the polarization-depolarization current from leaking, and meanwhile, a current detection module sealed by polyurethane and a microcontroller with a 24-digit A-D converter are adopted, and accordingly the whole device is high in antijamming capability, simple and convenient in testing process and high in current detection precision.

Description

technical field [0001] The invention belongs to the field of power cable detection, and more specifically relates to a polarization-depolarization current detection device for XLPE medium-voltage cables. Background technique [0002] Cross-linked polyethylene (XLPE) power cables are widely used in urban distribution networks due to their excellent thermal, mechanical and electrical properties, easy installation and maintenance, and low dielectric loss. During the operation of the cable, water branches are formed under the joint action of moisture and electric field. Water branches can further develop into electric branches, which will reduce the insulation performance of the cable, cause rapid insulation breakdown, and cause cable failure. Therefore, it is necessary to find a method for on-site diagnosis of cable insulation to evaluate the insulation status of cables. [0003] Apply a DC voltage to the cable test product. At this time, the current flowing through the test ...

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Application Information

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IPC IPC(8): G01R19/25G01R31/12
Inventor 李化林福昌叶刚吴小刚黄泽琦张钦
Owner HUAZHONG UNIV OF SCI & TECH
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