基于修正分数Poynting-Thomson模型的高压XLPE海缆绝缘评估
Evaluation of high-voltage XLPE submarine cable insulation based on modified fractional Poynting-Thomson model
张涛 1时光蕤 1张楠 2杜安琪 3吴倩1
作者信息
- 1. 三峡大学 湖北省输电线路工程技术研究中心,湖北 宜昌 443002
- 2. 华润新能源投资有限公司安徽分公司,安徽 合肥 230031
- 3. 国网湖北省电力有限公司直流公司,湖北 宜昌 443000
- 折叠
摘要
为利用频域介电谱准确评估高压交联聚乙烯(XLPE)海缆的绝缘状态,建立考虑直流电导率的修正分数Poynting-Thomson模型(分数P-T模型)以解析高压XLPE海缆的介电特性.首先,通过加速老化试验制备不同老化程度的高压XLPE海缆试样,并测得各组老化试样的力学、理化和介电数据.然后,应用修正分数P-T模型对实测介电曲线进行拟合,对比修正前后分数P-T模型表征实测介电曲线的效果.最后,通过仿真探究模型参数对介电曲线的影响规律,构建模型参数与绝缘程度之间的联系,将提出的老化特征参数与断裂伸长率(EAB)进行量化研究.研究结果表明,修正分数P-T模型能够准确拟合出不同老化程度高压XLPE海缆试样的介电曲线,提出的老化特征参数α、εa、εb和σdc可实现对高压XLPE海缆绝缘状态的量化评估.
Abstract
To accurately assess the insulation status of high-voltage cross-linked polyethylene(XLPE)submarine cables using the frequency domain dielectric spectroscopy,a modified fractional Poynting-Thomson model(fractional P-T model)was established considering direct current conductivity to analyze the dielectric properties of high-voltage XLPE submarine cables.Firstly,high-voltage XLPE submarine cable samples of different aging degrees were prepared through accelerated aging tests,and the mechani-cal,physicochemical,and dielectric data of each group of aged samples were measured.Subsequently,the modified fractional P-T model was applied to fit the measured dielectric curves,comparing effective-ness of the fractional P-T model before and after modification in characterizing the measured dielectric curves.Finally,through simulation,the influence of model parameters on the dielectric curves was ex-plored,relationship was established between model parameters and insulation levels,and a quantitative study was conducted of the proposed aging characteristic parameters with the elongation at break(EAB).The research results indicate that the modified fractional P-T model can accurately fit the dielectric curves of high-voltage XLPE submarine cable samples with different degrees of aging,and the proposed aging characteristic parameters α,εa,εb,and σdc can realize the quantitative assessment of the insulation sta-tus of high-voltage XLPE submarine cables.
关键词
高压交联聚乙烯海缆/热老化/频域介电谱/分数Poynting-Thomson模型/老化特征参数/老化评估Key words
high-voltage cross-linked polyethylene submarine cable/thermal aging/frequency domain di-electric spectra/fractional Poynting-Thomson model/aging characteristic parameter/aging assessment引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据