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Method for evaluating insulation aging of XLPE cable based on polarization factor

A cable insulation and insulation aging technology, applied in the direction of measuring electricity, measuring electrical variables, testing dielectric strength, etc., can solve problems such as insulation breakdown, reduce the insulation performance of XLPE cables, and threaten the safe operation of XLPE cables, so as to reduce the workload , Improve the efficiency of operation and maintenance management

Active Publication Date: 2021-03-26
SOUTHWEST JIAOTONG UNIV
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AI Technical Summary

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

Method used

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  • Method for evaluating insulation aging of XLPE cable based on polarization factor
  • Method for evaluating insulation aging of XLPE cable based on polarization factor
  • Method for evaluating insulation aging of XLPE cable 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 an XLPE cable due to the polarization effect. According to the method, a real part and an imaginary part of the power frequency complex dielectric constant of the XLPE cable are measured by using a dielectric spectrum tester, then the real part and the imaginary part of the polarization coefficient of the XLPE cable aremeasured by using a polarization / depolarization current method (PDC), and evaluation of the insulation aging degree of the XLPE cable caused by the polarization effect is realized by calculating thepolarization factor.

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 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. 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 polarization effects....

Claims

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Application Information

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