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Mathematical model for predicting electric heating combined aging life of crosslinked polyethylene cable

A technology of cross-linked polyethylene and mathematical models, which is applied in the field of power cables, can solve problems such as not considering the influence of aging, and achieve the effects of ensuring safe operation of cables, good protection, and improved accuracy

Active Publication Date: 2021-06-11
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

At present, the evaluation of the aging degree of cables is mostly based on single-factor electrical aging or thermal aging, without considering other aging factors and the influence of each factor on the aging degree. A New Mathematical Model for Cable Remaining Life Prediction Under Aging Interaction

Method used

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  • Mathematical model for predicting electric heating combined aging life of crosslinked polyethylene cable
  • Mathematical model for predicting electric heating combined aging life of crosslinked polyethylene cable
  • Mathematical model for predicting electric heating combined aging life of crosslinked polyethylene cable

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Embodiment Construction

[0028] A mathematical model for predicting the combined electric and thermal aging life of XLPE cables, the estimated life of the cable is t i The mathematical model expression of is:

[0029]

[0030] In the formula, t i Unit h, E i is the applied voltage of the i-th stage, unit V; K i is the thermal aging temperature, unit K; n is the life index of the cable, which can be measured by the voltage step-by-step breakdown method; b is a constant related to the activation energy; k 1 、k 2 、k 3 , C is a constant, which is related to the material of the cable and the installation process.

[0031] It can be seen from the above formula that for XLPE power cables, it is only necessary to measure the cable life index and obtain b in the thermal aging equation, and then obtain the breakdown test by conducting breakdown experiments on 4 groups of cables with different degrees of electrical and thermal aging. got k 1 、k 2 、k 3 , C can predict the life of cables under any temp...

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Abstract

The invention discloses a mathematical model for predicting the electric heating combined aging life of a crosslinked polyethylene cable. The invention belongs to the technical research field of power cables. Based on a DSC method and a step-by-step boosting method, on the basis of an electric aging model and a thermal aging equation of an original inverse power law, step-by-step boosting breakdown experiments are carried out on five groups of cables with different aging degrees. According to experimental data, while respective effects of electric aging and thermal aging and interaction between the electric aging and the thermal aging are considered, a power cable life prediction equation capable of simultaneously representing the electric aging life, the thermal aging life and the combined effect between the electric aging life and the thermal aging life is given. According to the invention, the residual life of the cable can be obtained through the life prediction equation when the thermal historical data and the power-on voltage of the cable in normal operation are given, and the effect of evaluating the life of the power cable at any time on the premise of not carrying out a destructive experiment is achieved.

Description

technical field [0001] The invention belongs to the technical research field of power cables, in particular to a new mathematical model for cable life prediction. Background technique [0002] As one of the largest supporting industries in the national economy, wire and cable is the foundation of various industries. Its products are widely used in electric power, construction, civil, communication, shipbuilding, aviation, petrochemical and other fields. However, with the gradual increase of the operating life of the early-stage cables, and due to the effects of heat generation caused by overload, moisture penetration in the environment, and self-insulation oxidation, a series of thermal aging, water tree aging, and damp insulation of the cable have occurred. The problem is becoming more and more prominent. Therefore, it is of great significance to quickly and accurately judge the aging degree of the cable insulation and give the estimated life of the cable insulation to pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06Q10/04G06F119/04G06F113/16
CPCG06F30/20G06Q10/04G06F2119/04G06F2113/16
Inventor 朱博王天宇房志寒
Owner HARBIN UNIV OF SCI & TECH
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