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Method for evaluating insulation of crosslinked polyethylene medium-voltage cable through polarization current

A technology of cross-linked polyethylene and polarized current, which is applied in the direction of testing dielectric strength, can solve the problems of staying, difficult power system promotion, and insufficient accuracy of monitoring results, and achieves non-destructive, sensitive reflection, and simple testing process Effect

Inactive Publication Date: 2015-03-25
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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Problems solved by technology

The online detection method is relatively mature, but due to the interference of the harsh environment on site and the operating voltage, the accuracy of the monitoring results is insufficient, and it is difficult to popularize in the power system; Effectively eliminate environmental interference, but the live detection method only stays at the stage of "discovering problems", and cannot quantify the cable aging degree

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  • Method for evaluating insulation of crosslinked polyethylene medium-voltage cable through polarization current
  • Method for evaluating insulation of crosslinked polyethylene medium-voltage cable through polarization current
  • Method for evaluating insulation of crosslinked polyethylene medium-voltage cable through polarization current

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Embodiment Construction

[0016] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0017] The embodiment of the method for evaluating the insulation of XLPE medium-voltage cables by using the polarization current method of the present invention includes the following steps:

[0018] S1, directly connecting the high-voltage end and the low-voltage end of a DC high-voltage power supply 10 (greater than or equal to 1000V) to the wire core and the metal shielding layer of the cross-linked polyethylene medium-voltage cable sample 11, respectively, to generate cable polarization current;

[0019] The samples include new cables and cables with different aging degrees; S2, use a weak current detector 12 to connect to the low-voltage end of the loop to detect the polarization current of the cable sample 11, transmit it to and store the polarization current in real time through the computer 13 current data;

[0020] S3, use the exten...

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Abstract

A method for evaluating insulation of a crosslinked polyethylene medium-voltage cable through polarization current includes the following steps that S1, a high-voltage end and a low-voltage end of a direct current high voltage power source (10) are directly connected with a cable core and a metal shielding layer of a crosslinked polyethylene medium-voltage cable sample (11) respectively, voltage -1kV is output, and cable polarization current is generated, wherein the sample comprises a new product and various cables at different aging degrees; S2, a weak current detection meter (12) is connected with a loop voltage end to detect the polarization current of the cable sample, the polarization current is transmitted, and polarization current data are stored through a computer (13) in real time; S3, fitting is carried out on the polarization current through an expansion Debye model to obtain model parameters, dielectric loss spectrums at the lower frequency of 0.001-0.05 Hz are obtained through Fourier transform, and the relative aging degree is evaluated by comparing the dielectric loss spectrums of the different cables. The method for evaluating insulation of the crosslinked polyethylene medium-voltage cable through the polarization current is simple and convenient in test process, free of damage and sensitive in response to partial serious defects, the overall aging degree of the XLPE cable is evaluated on the basis of the ageing mechanism, and the result is more persuasive.

Description

technical field [0001] The invention relates to a method for evaluating the insulation of cross-linked polyethylene medium-voltage cables, in particular to a method for evaluating the insulation of cross-linked polyethylene medium-voltage cables by using polarization current. Background technique [0002] The structure of cross-linked polyethylene (XLPE) power cable is core, inner semiconducting layer, XLPE insulating layer, outer semiconducting layer, metal shielding layer and outer sheath from inside to outside. And electrical performance, easy installation and maintenance, low dielectric loss, etc., are widely used in urban distribution networks. During the operation of the cable, water branches will be formed under the joint action of moisture and electric field, and the water branches can further develop into electric branches, which will reduce the insulation performance of the cable, and sometimes cause the insulation to be broken down, resulting in cable failure. Th...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 徐晓刚李鑫李化陈晓科汪进锋黄杨珏叶刚林福昌刘毅张钦
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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