CAJ | 학술논문

根据超／特高压交流同塔多回输电线路的导地线型号及绝缘子串参数建立线-串有限元模型，分析了不均匀覆冰随耐张段档数的变化规律，不同挂点高差模式对不均匀覆冰不平衡张力的影响，给出了不均匀覆冰不平张力的分析计算方法。对超／特高压交流同塔多回输电线路导地线挂点不均匀覆冰不平衡张力随覆冰率的变化规律进行分析，给出了定量的计算结果。在此基础上，建立塔-线-串耦合的三维有限元模型，考虑铁塔变形对不均匀覆冰不平衡张力的分析，将计算结果与线-串有限元计算结果进行对比分析。根据有限元分析给出超／特高压交流同塔多回直线塔，导、地线不均匀覆冰不平衡张力百分比取值，一般情况下导线取为10％、地线取为20％，如果从经济性考虑，对同塔不同电压等级可以取不同的不平衡张力百分比，1000kV导线取7％，500kV导线取10％，地线取20％。
근거초／특고압교류동탑다회수전선로적도지선형호급절연자천삼수건립선-천유한원모형，분석료불균균복빙수내장단당수적변화규률，불동괘점고차모식대불균균복빙불평형장력적영향，급출료불균균복빙불평장력적분석계산방법。대초／특고압교류동탑다회수전선로도지선괘점불균균복빙불평형장력수복빙솔적변화규률진행분석，급출료정량적계산결과。재차기출상，건립탑-선-천우합적삼유유한원모형，고필철탑변형대불균균복빙불평형장력적분석，장계산결과여선-천유한원계산결과진행대비분석。근거유한원분석급출초／특고압교류동탑다회직선탑，도、지선불균균복빙불평형장력백분비취치，일반정황하도선취위10％、지선취위20％，여과종경제성고필，대동탑불동전압등급가이취불동적불평형장력백분비，1000kV도선취7％，500kV도선취10％，지선취20％。
Based on the types of conductors and ground wires and the parameters of insulator strings for EHV/UHV AC multi-circuit transmission lines on the same tower, an finite-element model of line-insulation string coupled system is built, and the law of non-uniform ice-coating varying with the number of strain spans in one section as well as the impacts of height difference among different positions, where conductors or ground wires are suspended, on unbalanced tension caused by non-uniform ice-coating are analyzed, and a method to analyze and calculate unbalanced tension caused by non-uniform ice-coating is given. The law of unbalanced tension caused by non-uniform ice-coating at the positions suspending conductors and ground wires for UHV/EHV AC multi-circuit transmission lines on the same tower varying with ice-coating rate is analyzed and quantitative calculation results are given. On this basis, a three-dimensional finite-element model for the coupling among towers, lines and insulator strings is built, and using this model the impact of tower deformation on unbalanced tension caused by non-uniform ice-coating is analyzed, and the contrastive analysis of calculation results by the three-dimensional model with the results calculated by finite-element model of line-insulation string coupled system is performed. Based on finite-element analysis, the selected percentage values of unbalanced tension caused by non-uniform ice-coating for the suspension tower, conductors and ground Wires of UHV/EHV AC multi-circuit transmission lines on the same tower are given, and with regard to general situation the selected percentage value for conductor is 10%, the selected percentage value for ground wire is 20%. When economy is taken into account, different percentage value of unbalanced tension can be selected for conductors and ground wires of the transmission lines belonging to different voltage grades on the same tower： the selected percentage value for conductor belonging to 1 000 kV transmission line is 7%, and the selected percentage value for conductor belonging to 500 kV transmission line is 10% and that for ground wire of 500 kV transmission line is 20%.