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Evaluation method for remaining life of medium and high voltage power cables considering stress randomness

A technology for power cable and life assessment, applied in computing, electrical digital data processing, special data processing applications, etc., can solve problems such as difficulty in accurately estimating and predicting the remaining service life of cables, reducing unplanned power outages and improving power supply quality. , the effect of improving the accuracy

Active Publication Date: 2018-01-19
STATE GRID CORP OF CHINA +4
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Problems solved by technology

Existing models and methods are difficult to accurately estimate and predict the remaining service life of cables, and a new method for estimating the remaining life of cables considering random characteristics is urgently needed

Method used

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  • Evaluation method for remaining life of medium and high voltage power cables considering stress randomness
  • Evaluation method for remaining life of medium and high voltage power cables considering stress randomness
  • Evaluation method for remaining life of medium and high voltage power cables considering stress randomness

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Embodiment 1

[0036] Embodiment 1: A method for assessing the remaining life of medium and high voltage power cables considering randomness of stress, including determination of thermal stress of power cables taking into account randomness, calculation of electrical stress of power cables considering randomness, and power cable based on stochastic model The remaining useful life is estimated by these steps, as attached figure 1 shown. Since the method is automatically realized through the power cable state monitoring and intelligent evaluation system, it also includes two steps of power cable operation data loading and power cable life data storage. Cable life refers to the time elapsed from the beginning of use of the power cable to the loss of basic functions, and the remaining life of the cable refers to the time elapsed from a certain moment in the use of the power cable to the loss of basic functions.

[0037] 1. Power cable operation data loading

[0038] Usually, the loading of the...

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Abstract

The invention relates to a method for assessing the remaining life of medium and high-voltage power cables considering randomness of stress, including determination of thermal stress of power cables taking into account randomness, calculation of electric stress of power cables considering randomness, and residual life of power cables based on stochastic models. service life estimate. The determination of the thermal stress of the power cable considering randomness includes calculating the thermal stress of the cable within each step time; the calculation of the electrical stress of the power cable considering randomness includes obtaining the electric field intensity curve of the power cable in a stepwise change; The remaining service life estimation of the power cable of the model includes obtaining the cable life model and the random model of the cable electrothermal degradation amount under the synergistic action of the power cable under the electric stress and thermal stress, and estimating the mathematical expectation value and variance of the cumulative life degradation amount of the power cable. This method improves the accuracy of the estimation of the remaining life of medium and high voltage cables, and solves the technical problems of determining the remaining life of cables and accurately formulating a scientific replacement plan in cable asset management.

Description

technical field [0001] The invention relates to a method for assessing the remaining life of medium and high voltage power cables in consideration of stress randomness, and belongs to the field of state monitoring and assessment of electric equipment. Background technique [0002] With the acceleration of urbanization and the continuous expansion of city scale, the demand for electricity shows a trend of rapid growth. In order to meet the needs of large-capacity power transmission, medium and high voltage power cables are widely used in urban power grids. Considering the safety, reliability and aesthetics of power supply, underground power cables are usually used in cities, which mainly include direct burial, buried in cable trenches or conduits, and buried in special cable channels. [0003] Power cables are composed of core conductors, insulating materials and protective layers. Due to long-term current-carrying and heating of the core conductors, and the continuous influ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 王纯林张梁李石李杨周承科周文俊唐泽洋周灏郝乾
Owner STATE GRID CORP OF CHINA
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