东南大学学报（自然科学版）Issue(5)：935-940,6.DOI:10.3969/j.issn.1001-0505.2014.05.011
高压输电导线局部破损断裂机理及风险评估
Mechanism and risk assessment of conductors' localized breakage-fracture in high-voltage transmission lines
摘要
Abstract
The risk-based maintenance of high-voltage conductors was implemented by establishing the risk assessment model from aluminum strands'localized breakage to conductors'fracture accord-ing to the mechanical structure reliability theory.Quantitative relationships between fracture risk probabilities and breakage degree,tensile force,current,ambient temperature,heat transfer coeffi-cient and duration time were assessed respectively based on this model.And the graded warning in-tervals of these risk factors were calculated according to the risk probability ranking intervals.The results show that the conductors'fracture risk probabilities increase with time in a half parabolic man-ner.And the threshold values corresponding to the risk probabilities are over 1 3 .23% for breakage degree,30% ultimate tensile strength for tensile force,500 A for current,35 ℃for ambient temper-ature,and below 20 W/(m2 ·K)for heat transfer coefficient.The importance ranking of these risk factors is as followbreakage degree,tensile force,current,ambient temperature,and heat transfer coefficient.There are level Ⅰ,Ⅱ,Ⅲ,Ⅳ warning interval in both breakage degree and tensile force,and level Ⅰ,Ⅱ warning interval in current.While in conventional environment,there are only level Ⅰ warning intervals in ambient temperature and heat transfer coefficient.The established quantitative risk assessment model and ranking method can provide reference for the operation safety management of transmission line conductors.关键词
风险评估/破损程度/张力/电流/环境温度/散热系数Key words
risk assessment/breakage degree/tensile force/current/ambient temperature/heat transfer coefficient分类
矿业与冶金引用本文复制引用
吴洪亮,李晓红,朱成丽,窦洪..高压输电导线局部破损断裂机理及风险评估[J].东南大学学报（自然科学版）,2014,(5):935-940,6.基金项目
广东电网公司科技资助项目（K-GD2012-386）、中央高校基本科研业务费专项资金资助项目（274717）． （）
