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Method of evaluating insulation reliability of LXPE cable terminal in distribution network

A cable termination and reliability technology, applied in the direction of measuring electricity, measuring electrical variables, and testing dielectric strength, etc., can solve the problems of poor detection effect, lack of insulation reliability assessment methods, and troubles in safe and reliable operation of power cables, to avoid Insulation breakdown, improving equipment asset utilization, ensuring reliable operation

Inactive Publication Date: 2019-12-27
SOUTHWEST JIAOTONG UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] At present, the methods for evaluating the insulation reliability of power cable terminals laid in cable trenches are still relatively scarce, and the detection effect is poor, and the main research has not paid attention to this problem. caused great distress

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  • Method of evaluating insulation reliability of LXPE cable terminal in distribution network
  • Method of evaluating insulation reliability of LXPE cable terminal in distribution network
  • Method of evaluating insulation reliability of LXPE cable terminal in distribution network

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with specific examples.

[0024] The invention helps the power grid company to quickly judge and evaluate the degree and status of the cable terminal in the routine inspection of the distribution network, and its process includes:

[0025] 1.1 Perform frequency domain dielectric response test

[0026] During the routine inspection of urban distribution network cables, the power grid company connects the XLPE cable terminals to be detected with the frequency domain dielectric spectrum tester, and then conducts the following detection methods:

[0027] The frequency domain dielectric spectrum tester tests the dielectric loss tanδ of the cable terminal sequentially at multiple frequency points, and the test frequency f i 0.0001Hz, 0.0002Hz, 0.0005Hz, 0.01Hz, 0.02Hz, 0.05Hz, 0.1Hz, 0.2Hz, 0.5Hz, 1Hz, 2Hz, 5Hz, 10Hz, 20Hz, 50Hz, 100Hz, and get the corresponding medium Loss tanδ i , take i=0,1,...,15; 1.2...

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Abstract

The invention discloses a method of evaluating insulation reliability of an LXPE cable terminal in a distribution network, helping a power grid company evaluate insulation reliability of a cable terminal when maintaining a cable. The evaluation method comprises steps of performing frequency domain dielectric response test on a cable terminal, fitting a function relationship between test frequencyand medium loss, calculating insulation evaluation parameters, so as to evaluate insulation state and service performance of the cable. The method has the beneficial effects of evaluating insulation reliability of a power cable terminal used in an urban distribution network efficiently, accurately, safely and conveniently so as to prevent insulation breakdown due to serious insulation of the cableterminal to guarantee reliable running of the cable, and determining insulation state and service performance of the cable terminal, so as to provide basis for workers on the site to further exploreinner insulation state of the cable terminal, and being significant in guaranteeing reliable running of the system and improving use ratio of equipment assets.

Description

technical field [0001] The invention relates to the field of cable terminal fault evaluation, in particular to a method for evaluating the insulation reliability of an XLPE cable terminal in a distribution network. Background technique [0002] Cross-linked polyethylene (XLPE) power cables are widely used in urban power grids due to their excellent mechanical properties and insulation properties. Due to the mechanical damage during transportation, laying, and installation, as well as the imperfection of the process itself, the existence of defects (such as impurities, cracks, etc.) in cables is inevitable. In addition, the cable is laid in the cable trench or directly buried in the ground, the laying environment and use status will greatly affect the insulation life of the cable. The cable itself runs in a humid environment such as underground or seabed for a long time, and is easily affected by moisture penetration and moisture. With the slow infiltration of moisture in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 周利军杨涵邢立勐张靖康曹伟东权圣威
Owner SOUTHWEST JIAOTONG UNIV
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