Estimation method of power cable electrothermal degradation cumulative quantity considering stochastic process

A power cable, random process technology, applied in computing, electrical digital data processing, instruments, etc., to ensure continuity, improve accuracy and reliability

Active Publication Date: 2017-11-17
STATE GRID CORP OF CHINA +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although some literatures have considered the statistical Miner theory based on stochastic processes in their research, so far, no literature has estimated the loss of cable life from the perspective of considering the random distribution of daily electrothermal stress, and obtained the time-varying cable life loss. failure probability

Method used

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  • Estimation method of power cable electrothermal degradation cumulative quantity considering stochastic process
  • Estimation method of power cable electrothermal degradation cumulative quantity considering stochastic process
  • Estimation method of power cable electrothermal degradation cumulative quantity considering stochastic process

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Embodiment 1

[0038] Embodiment 1: A method for estimating the cumulative amount of power cable degradation that is automatically realized through the power cable state monitoring and intelligent evaluation system considering the random characteristics of electrical and thermal stress, including the determination of the daily load of the power cable, the temperature estimation of the power cable conductor, the power cable The steps of determining the electrothermal life model, modeling the stochastic characteristics of the power cable degradation accumulation process, and estimating the power cable degradation accumulation are as follows: figure 1 shown.

[0039] 1. Determination of the daily load of power cables

[0040] The determination of the daily load of power cables is as attached figure 2 shown, including:

[0041] (1) Obtain the power load of the power cable that changes continuously over time due to changes in environmental factors (including seasonal and climate factors); the ...

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Abstract

The invention relates to a method for estimating the cumulative amount of electrothermal degradation of a power cable considering a random process, including determination of the daily load of the power cable, estimation of the temperature of a conductor of the power cable, determination of an electrothermal life model of the power cable, and estimation of the cumulative amount of degradation of the power cable. The determination of the daily load of the power cable includes obtaining the load curve of the power cable in a step change and the current in the cable; the temperature estimation of the power cable conductor includes obtaining the temperature distribution of the cable conductor; the determination of the electrothermal life model of the power cable includes estimating the electrical stress, Cable service life under thermal stress and the synergistic effect of the two; the estimation of the cumulative amount of power cable degradation includes calculating the cumulative amount of cable degradation over a period of time. This method can improve the accuracy of cable service life prediction.

Description

technical field [0001] The invention relates to a method for estimating the cumulative amount of electrothermal degradation of power cables considering random processes, belonging to the field of state monitoring and evaluation of power equipment. Background technique [0002] The degradation of the power cable will lead to the reduction of its service life, and it will also adversely affect the normal operation of the power cable. Analysis of the data associated with cable degradation allows for more accurate inferences about the operational reliability and useful life of the cable than historical failure data. Under normal operating conditions, power cables will be damaged by various stresses to varying degrees, and the synergistic destructive effects of electrical stress and thermal stress on cable insulation account for the largest proportion of various stresses. The electrical stress is related to the electric field; the thermal stress caused by the copper loss in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00G01R31/08
Inventor 项勇姚雷明吴仁宜杨浩周灏韩雪菲周承科周文俊王航
Owner STATE GRID CORP OF CHINA
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