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High-voltage single conductor cable service life evaluating method and system

A single-core cable, life evaluation technology, applied in electrical digital data processing, special data processing applications, instruments, etc., to achieve the effect of improving accuracy

Active Publication Date: 2016-02-03
GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Based on this, it is necessary to provide a high-voltage single-core cable life evaluation method and system for improving the accuracy of insulated cable life evaluation.

Method used

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  • High-voltage single conductor cable service life evaluating method and system
  • High-voltage single conductor cable service life evaluating method and system
  • High-voltage single conductor cable service life evaluating method and system

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Embodiment 1

[0029] In order to improve the accuracy of life evaluation of insulated cables, the present invention provides a method for life evaluation of high-voltage single-core cables, which is mainly applied to high-voltage single-core cables in the aging stage; figure 1 It is the flow chart of Embodiment 1 of the high-voltage single-core cable life evaluation method embodiment 1 of the present invention, such as figure 1 As shown, Embodiment 1 of the method for evaluating the life of a high-voltage single-core cable of the present invention includes the following steps:

[0030] Step S110: Processing the original operation and maintenance data of the high-voltage cable to obtain the non-failure data of the original operation and maintenance data of the high-voltage single-core cable;

[0031] In a specific embodiment, step S110 specifically includes: removing the fault data caused by factors other than cable body aging in the original operation and maintenance data of the high-voltag...

specific Embodiment

[0071] In order to further illustrate the implementation of the high-voltage single-core cable life assessment method of the present invention, the operation and maintenance data of high-voltage single-core cables in a city in southern China from 1999 to 2011 are used to analyze specific embodiments in days. From the start of operation to December 31, 2011, the above operation and maintenance data did not have a failure of the cable body due to aging. The present invention is only applicable to the case of no failure data. image 3 It is a flowchart of a specific embodiment of the high-voltage single-core cable life evaluation method of the present invention; as image 3 Shown:

[0072] (1) Raw data preprocessing

[0073] First, raw data processing is required, and the specific steps are as follows:

[0074] 1) On the basis of the original operation and maintenance data, after excluding the fault data caused by the aging of the cable body, the remaining data are the data of...

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Abstract

The invention relates to a high-voltage single conductor cable service life evaluating method and system. A high-voltage single conductor cable service life evaluating method comprises the following steps of acquiring high-voltage single conductor cable original operation zero-failure data, conducting estimation for shape and size parameters of a double-parameter Weibull distribution model built for evaluating high-voltage single conductor cable service life via a corrected maximum likelihood function to acquire shape parameter estimation values and size parameter estimation values, and acquiring a high-voltage single conductor cable service life distribution probability curve via the double-parameter Weibull distribution model according to the shape parameter estimation values and size parameter estimation values. Accurate fault analysis and fault prediction can be provided with fewer samples by the use of the Weibull distribution model; parameter estimation can be achieved even when zero-failure samples do not exist by the corrected maximum likelihood function; and accuracy for insulation cable service life estimation can be improved.

Description

technical field [0001] The invention relates to the field of state monitoring and evaluation of electric equipment, in particular to a method and system for evaluating the life of a high-voltage single-core cable. Background technique [0002] At present, my country's research on the life of insulated cables is still in its infancy, and the relevant content of the research life is mainly concentrated in the following three aspects: [0003] 1) Research on the aging mechanism of insulated cables, respectively: a. Research on the aging mechanism of electrical trees, using the needle electrode short cable electrode system as an experimental platform to study the morphological characteristics and growth of electrical trees such as temperature, voltage, and boosting speed and development; b. Aiming at the research on the aging mechanism of water trees, the formation mechanism of water trees is studied from three aspects: mechanical action, chemical potential effect, and the mutua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 徐涛李明贞刘毅刚周文俊徐研李艳飞
Owner GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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