自然覆冰条件下的输电线路覆冰形状特征  

Shape Characteristics of Iced Transmission Conductor under Natural Icing Condition

作　　者：范松海[1] 龚奕宇[1] 刘益岑[1] 薛志航[1] 

机构地区：[1]国网四川省电力公司电力科学研究院,四川成都610072

出　　处：《四川电力技术》2014年第4期14-17,75,共5页Sichuan Electric Power Technology

摘　　要：覆冰导线的横截面形状在估算融冰时间或融冰电流中具有重要的影响。因此,调查覆冰导线的形状特征具有重大意义。在众多现场试验调查的基础之上,提出了一种椭圆形模型来描述覆冰导线的形状特征,把覆冰导线的形状分为三类,分别为同心圆、偏心圆和偏心椭圆,并分析了不同覆冰形状对输电线路融冰时间的影响。分析结果表明,覆冰导线的横截面形状满足一个假说,即冰的最大厚度在导线的迎风侧,而最小厚度在导线的背风侧;在其它融冰条件不变的情况下,导线覆冰偏心率越大、需要融化的冰层越薄,融冰时间越短;即覆冰形状越扁,最大融冰时间越小。The cross-section shape of iced conductor plays an important role in estimating ice -melting time or ice-melting current.So it is of great significance to investigate the shape characteristics of iced conductor .On the basis of a lot of investi-gations on the field experiments , an ellipse-shaped model is put forward to describe the shape characteristics , and the iced conductors are classified into three species , including concentric circle , eccentric circle and eccentric ellipse .The effects of different iced conductors′species on the ice-melting time are also analyzed .The analysis results show that the cross -section shape of iced conductor meets a hypothesis , namely that the maximum thickness of ice is on the upwind side of conductor , while the minimum on the downwind side , and the larger eccentricity , the shorter ice-melting time.

关 键 词：导线 覆冰 形状 融冰时间 

分 类 号：TM732[电气工程—电力系统及自动化]