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A cable insulation aging detection method based on polarization and depolarization current method

A technology of cable insulation and detection method, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as electric accident, cable system aging, outer sheath damage, etc., and achieves convenient implementation, high detection sensitivity, and accuracy. Effects of insulation aging conditions

Active Publication Date: 2018-11-09
SICHUAN UNIV
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Problems solved by technology

Since cables will inevitably produce many quality defects in the production and manufacturing process, such as micropores, impurities, etc., and will also be subject to some mechanical damage during transportation and laying, such as cracks, outer sheath damage, etc., cables laid underground Under the synergistic effect of multiple physical fields such as AC sinusoidal voltage, impulse voltage, moisture and temperature for a long time, the cable system will gradually age and eventually cause electrical accidents

Method used

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  • A cable insulation aging detection method based on polarization and depolarization current method
  • A cable insulation aging detection method based on polarization and depolarization current method
  • A cable insulation aging detection method based on polarization and depolarization current method

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Embodiment

[0041] This embodiment provides a cable insulation aging detection method based on the polarization and depolarization current method, and specifically analyzes the method in combination with relevant examples.

[0042] Based on the growth mechanism of water tree and the aging method of water needle electrode, the cable accelerated water tree aging sample is designed, such as figure 1 shown.

[0043] Cut 30 100m YJV22-3×95 type 8.7 / 10kV XLPE cables into 95m and 5m. Make a terminal head for a 95m cable and use it as a long cable sample for water tree aging. Among them, 5m cables are made into short cable samples with a single core length of 50cm each, which are used as reference short cable samples for long cable samples.

[0044] Strip the three-phase cable within 25cm of the middle part of the 95m-long cable sample with the terminal head, take corresponding waterproof and sealing measures for phase A without any other treatment and aging, and use it as a new cable sample for ...

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Abstract

A cable insulation aging detection method based on a polarization and depolarization current method relates to the technical field of cable insulation aging detection. Including using the polarization and depolarization current method to detect the dielectric loss factor tanδ(polarization, 1kV, 0.1Hz) of the polarization current at 0.1Hz under the test voltage of 1kV and the dielectric loss factor tanδ(depolarization) of the depolarization current at 0.1Hz under the test voltage of 1kV , 1kV, 0.1Hz) ratio. If Kas is greater than 1, it indicates that there is a concentration defect in the cable. If Kas is less than 1, it indicates that the overall insulation of the cable is deteriorated. It is simple, fast, convenient to implement, and has high detection sensitivity, which can more accurately reflect the insulation aging of cables, thereby providing reference for the maintenance and replacement of cable lines, and reducing unplanned power outages.

Description

technical field [0001] The invention relates to the technical field of cable insulation aging detection, in particular to a cable insulation aging detection method based on a polarization and depolarization current method. Background technique [0002] With the process of urbanization in our country, the proportion of underground cables in power transmission lines is increasing day by day, and has become the main product used to transmit and distribute high-power electric energy in power systems. Since cables will inevitably produce many quality defects in the production and manufacturing process, such as micropores, impurities, etc., and will also be subject to some mechanical damage during transportation and laying, such as cracks, outer sheath damage, etc., cables laid underground Under the long-term synergy of multiple physical fields such as AC sinusoidal voltage, impulse voltage, moisture, and temperature, the cable system will gradually age and eventually cause electr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01N17/00
CPCG01N17/00G01R31/1272
Inventor 雒瑞森周凯黄明马辉任品朱光亚
Owner SICHUAN UNIV
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