Power cable withstand voltage test method and device based on withstand voltage equivalent analysis, and terminal

Abstract

The invention provides a power cable withstand voltage test method and device based on withstand voltage equivalent analysis, and a terminal. The method comprises the following steps: carrying out a withstand voltage test on a target power cable by adopting 0.1 Hz cosine square wave voltage to obtain an initial test result; and correcting the initial test result according to a preset equivalent analysis result, and determining the corrected test result as a final test result of the target power cable. The process of obtaining the preset equivalent analysis result is that processing frequency voltage and 0.1 Hz cosine square wave voltage are applied to multiple groups of insulation defect models with different insulation residual thicknesses respectively, and a withstand voltage test is carried out; according to the obtained multiple sets of breakdown time and breakdown failure probability, Weibull distribution of the power frequency voltage and 0.1 Hz cosine square wave voltage is obtained; and carrying out equivalence analysis based on scale parameters, shape parameters and morphological characteristics of the breakdown channel in Weibull distribution to obtain an equivalent analysis result. On the basis of equivalent analysis, the accuracy of the withstand voltage test result is improved.

Description

technical field [0001] The invention relates to the technical field of power cables, in particular to a power cable withstand voltage test method, device and terminal based on withstand voltage equivalent analysis. Background technique [0002] Power cables are cables used to transmit and distribute electrical energy, and are often used in urban underground power grids, power station lead-out lines, internal power supply in industrial and mining enterprises, and underwater transmission lines across rivers and seas. With the increasing requirements for power supply reliability, the use of power cables in urban power grids has also increased significantly. [0003] In practical applications, most power cables are directly buried or laid in cable trenches, which are in contact with moisture or moisture for a long time. In addition, the power cable body and accessories will also experience a certain degree of insulation aging during long-term use, which will lead to power cable ...

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Problems solved by technology

[0005] The embodiment of the present invention provides a power cable withstand voltage test method, device and terminal based on withstand voltage equivalent analysis to solve the problem that the current withstand voltage test results of 0.1Hz cosine square wave voltage are not accurate enough

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