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A method for evaluating xlpe cable insulation aging based on polarization factor

A cable insulation and insulation aging technology, which is applied in the direction of measuring electricity, measuring electrical variables, and testing dielectric strength, etc., can solve the problems of insulation breakdown, reduce the insulation performance of XLPE cables, threaten the safe operation of XLPE cables, and reduce workload. , The effect of improving the efficiency of operation and maintenance management

Active Publication Date: 2021-09-24
SOUTHWEST JIAOTONG UNIV
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  • Application Information

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Problems solved by technology

[0002] With the increasing service life of cross-linked polyethylene (XLPE) cables, due to the polarization effect of the cross-linked polyethylene insulation layer, some defects and faults have occurred in the insulation of XLPE cables, reducing the insulation performance of XLPE cables and even causing insulation breakdown. , a serious threat to the safe operation of XLPE cables

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  • A method for evaluating xlpe cable insulation aging based on polarization factor
  • A method for evaluating xlpe cable insulation aging based on polarization factor
  • A method for evaluating xlpe cable insulation aging based on polarization factor

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Embodiment Construction

[0013] figure 1 It is a flow chart of the evaluation method for the insulation aging degree of XLPE cables due to polarization effects, by figure 1 It can be seen that a method for evaluating the aging of XLPE cable insulation based on polarization factor includes the following steps:

[0014] Step 1: Select the XLPE cable sample and test to obtain the complex dielectric constant and polarization coefficient of the XLPE cable sample:

[0015] Select XLPE cables aged 72h, 144h,...,t at 150°C in the laboratory as test samples, where t is the aging time, t∈{72n|n=1,2,...,10}. The real part and imaginary part of the power frequency complex permittivity of the cable are obtained by using a dielectric spectrum tester, which are recorded as ε′ respectively 1 ,ε′ 2 ,…,ε′ n and ε″ 1 ,ε″ 2 ,…,ε″ n ; Utilize the polarization / depolarization current method (PDC) test to obtain the real part χ ' and the imaginary part χ " of the polarization coefficient of the dielectric response of ...

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Abstract

The invention discloses a method for evaluating the insulation aging degree of XLPE cables due to polarization effects. The present invention first uses the dielectric spectrum tester to measure the real part and the imaginary part of the power frequency complex dielectric constant of the XLPE cable, and then uses the polarization / depolarization current method (PDC) to measure the real part and the imaginary part of the polarization coefficient of the XLPE cable. Part and imaginary part, by calculating the polarization factor, the evaluation of the insulation aging degree of the XLPE cable due to the polarization effect is realized.

Description

technical field [0001] The invention belongs to the field of evaluating the insulation aging degree of cross-linked polyethylene (XLPE) cables, in particular to a method for evaluating the insulation aging degree of XLPE cables based on polarization factors. Background technique [0002] With the continuous increase of the service life of cross-linked polyethylene (XLPE) cables, due to the polarization effect of the cross-linked polyethylene insulation layer, some defects and faults have occurred in the XLPE cable insulation, which reduces the insulation performance of XLPE cables and even causes insulation breakdown. , a serious threat to the safe operation of XLPE cables. In order to accurately judge the impact of polarization effects on the safe and reliable operation of XLPE cables and help the power sector to carry out work effectively, a method is urgently needed to accurately evaluate the degree of insulation aging of XLPE cables with different aging time due to polar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01R27/26
CPCG01R27/2617G01R31/1272
Inventor 郭蕾穆强张靖康
Owner SOUTHWEST JIAOTONG UNIV