架空地线连接金具熔断掉落事故的预防Accident Prevention of Falling Connecting Fittings for Overhead Transmission Lines
应函霖,黄旭骏,方琪
YING Han lin,HUANG Xu jun,FANG Qi
摘要(Abstract)：
针对直接接地的架空地线耐张连接金具被感应接地电流熔断掉线事故,分析指出:终端塔构架档因松弛架设而造成耐张连接悬挂金具接触电阻增大,设计及施工中没有采取地线耐张线夹与塔身良好的电气连接措施,架空地线常年处在交变电磁场中,连接金具通过感应接地电流发热而熔断是故障发生的原因,据此提出了整改措施。
Aiming at a line falling accident due to the fused strain connecting fittings of directly grounded overhead grounding wire by grounded induced current,the paper analyzes and believes that the causes are: increase of contact resistance of strain connecting and hanging fittings due to loose erection of frame span of terminal tower;no electrical connecting measures adopted between strain ground wire clamp and the tower during design and construction;the overhead grounding wire exposes to the alternating electromagnetic field;the connecting fittings become heated and fused due to the grounding current.The paper hereby proposes rectification measures.
关键词(KeyWords)：
架空地线;接地电流;连接金具;接触电阻
overhead ground wire;grounding current;connecting fittings;contact resistance
基金项目(Foundation):
作者(Author):
应函霖,黄旭骏,方琪
YING Han lin,HUANG Xu jun,FANG Qi
DOI: 10.19585/j.zjdl.2013.09.005