特高压直流输电线路直线塔重覆冰不平衡张力计算  

Unbalanced tension calculation of UHVDC transmission lines and suspension towers with heavy ice-coating

作　　者：宋刚[1] 张彤[1] 

机构地区：[1]浙江省电力设计院,浙江杭州310012

出　　处：《电力自动化设备》2014年第7期119-123,共5页Electric Power Automation Equipment

摘　　要：首先针对不平衡张力经典算法中存在的收敛速度慢、收敛于非正确解等问题提出解决办法,然后计算某实际±800 kV特高压直流输电工程中的某一实际耐张段在不同覆冰厚度情况下的不平衡张力,并与规程中的不平衡张力取值进行比较。结果表明,在重冰区直线塔两侧存在大档距、大高差或者直线塔靠近水汽丰富的地区时,应在规程取值的基础上适当提高不平衡张力系数,增强线路抗冰能力。最后给出了适用于该工程的不平衡张力系数。A solution is proposed aiming at the slow convergence speed and incorrect convergence result of a typical unbalanced tension algorithm,which is then applied in the unbalanced tension calculation for a strained segment of an actual ±800 kV UHVDC transmission line with ice-coating of different thicknesses. The calculative results are compared with shows that,the unbalanced tension coefficient the unbalanced tensions stipulated by the regulation,which should be set appropriately higher than the stipulated value to enhance the ice-damage resistance if the span or height difference between two suspension towers in area with heavy ice accretion is large or the suspension towers are near moist area. The unbalanced tension coefficients suitable for that ±800kV UHVDC transmission line are given.

关 键 词：特高压输电 直流输电 不平衡张力 直线塔 覆冰 

分 类 号：TM75[电气工程—电力系统及自动化]