高电压技术2025，Vol.51Issue(2)：925-935,11.DOI:10.13336/j.1003-6520.hve.20240057
考虑空间电荷效应的步进应力法获取XLPE绝缘直流电压耐受指数
Obtaining DC Voltage Endurance Coefficient of XLPE Insulation by Step Stress Method Considering Space Charge Effect
摘要
Abstract
The phenomenon of electric field distortion under DC electric field significantly affects the long-term voltage endurance characteristics of cross-linked polyethylene(XLPE).Existing methods for obtaining the n value of the voltage endurance coefficient of XLPE do not take into account the effect of the distortion field on insulation damage,resulting in large differences in the n value obtained for similar samples under different test conditions in AC and DC.Therefore,the effect of aberrant field strength on the cumulative damage is characterized by modeling,which takes into account factors such as temperature,space charge density,and externally applied field strength,etc.The cumulative damage Dsc produced by different types of aberrant field strengths is obtained by applying the model to the accelerated life test of stepping stress.A method is proposed to analyze the data from the stepping stress test,which obtains the n value by solving the ei-genvalue of the m-order cumulative damage square matrix.Four sets of cumulative damage data from the step stress tests are analyzed,and the n values are obtained with and without considering Dsc,the former is in the range of 14.42～15.36 and the latter is in the range of 13.69～13.88,which indicates that the aberrant field strengths show a tendency to reducing the n value.In addition,increasing the step-up ∆U decreases Dsc to a minimum of Dsc=8.3×1021,corresponding to an n value that deviates only by 3.7%from the one without taking Dsc into account,indicating that the selection of a larger ∆U in the step-stress test helps to weaken the effect of the field-strength distortion.关键词
交联聚乙烯/步进应力法/场强畸变/空间电荷/累积损伤Key words
cross-linked polyethylene/step-stress method/electric field distortion/space charge/cumulative damage引用本文复制引用
马志鹏,李宁一,陈新岗,谭世耀,范益杰..考虑空间电荷效应的步进应力法获取XLPE绝缘直流电压耐受指数[J].高电压技术,2025,51(2):925-935,11.基金项目
重庆市教育委员会科学技术研究项目(KJZD-K202101103 （）
KJQN202201133) （）
重庆理工大学科研启动基金(2021ZDZ016).Project supported by Science and Technology Research Program of Chongqing Municipal Education Commission(KJZD-K202101103,KJQN202201133),Scientific Research Initiation Fund of Chongqing University of Technology(2021ZDZ016). （2021ZDZ016）
