Power cable reliability estimation method based on time varying stress-intensity interference model

Abstract

The invention relates to a power cable reliability estimation method based on a time varying stress-intensity interference model. The method includes power cable cumulative degradation model establishment, power cable cumulative degradation and cumulative degradation threshold rate distribution parameter acquisition, power cable time varying stress-intensity interference model establishment and power cable reliability estimation based on the time varying stress-intensity interference model establishment. The power cable cumulative degradation model establishment and the power cable cumulative degradation and cumulative degradation threshold rate distribution parameter acquisition are performed firstly, the power cable time varying stress-intensity interference model is established, and the reliability of medium-high voltage cables can be estimated through the power cable time varying stress-intensity interference model; by the aid of the method, the problems that the accuracy and reliability of the power cable reliability estimation are low in the prior art are solved effectively, the medium-high voltage cable state estimation is more scientific and meets the actual engineering conditions better, and the high practical significance is provided.

Description

technical field [0001] The invention relates to a method for evaluating the reliability of medium and high voltage power cables based on a time-varying stress-strength interference model, and belongs to the field of state monitoring and evaluation of electric equipment. Background technique [0002] With the continuous rapid growth of my country's economy, the scale of urban power grids is increasing day by day. Power cables have become a widely used power transmission method for urban power grids due to their advantages such as small footprint, no impact on environmental beautification, and high safety. Because it is related to the important lifeline of the national economy, the urban power grid has extremely high requirements on the reliability of power supply, and the loss caused by any power grid failure to the national economy is immeasurable. Historically, mega-cities such as Tokyo, London, Moscow, Paris, New York, Sao Paulo, Rio de Janeiro, and New Delhi have experien...

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Problems solved by technology

In addition, because underground cables are usually laid by direct burial, pipelines, cable trenches and cable channels, their operating environment changes continuously with climate, seasons, and installation environments, and the measured data has certain randomness, so the life strength of cables Will gradually degrade under the action of stress over time

However, the traditional cable reliability calculation model based on the stress-strength model usually considers the life strength of the cable as a static random variable, which leads to the inaccuracy of conventional cable reliability estimation under specific environmental factors in actual engineering. Lack of practical guidance

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