摘要
为确保送电线路的安全运行,对500 kV直线塔绝缘子串风偏导致的线路跳闸故障进行深入分析。针对500 kV龙平甲线、500 kV马百线跳闸故障,根据故障录波图、行波测距等资料,结合天气情况、线路周围地形地貌、植被损坏及杆塔结构特点等,对故障情况、放电通道以及大风情况下直线塔绝缘子串风偏角、塔头间隙进行分析。结果表明,垂直档距与水平档距比值较小的直线塔,绝缘子串的风偏角较大,在大风情况下绝缘子串发生风偏容易造成导线与铁塔的间隙距离小于工频电压放电距离,从而导致线路跳闸。最后从设计、改造和运行等方面提出了相应的对策及建议。
In order to ensure the security operation of transmission line, line trip faults caused by the windage yaw of insulator string in 500 kV tangent tower are deeply analyzed. Aiming at trip faults of 500 kV Long-ping-jia line and 500 kV Ma-bai line, fault conditions, discharge channel and windage yaw angle of tangent tower insulator string and tower head gap under strong wind are analyzed according to materials including fault recoding graph and travelling wave fault location and so on, and combing with weather condition, geographic and geomorphic around line, destruction of vegetation and characteristics of tower structure and so on. Results show that the tangent tower with smaller ratio between vertical span and horizontal span has larger windage yaw angle of insulator string which easily causes the gap distance between conductor and iron tower smaller than discharging distance of power frequency voltage during the happiness of windage yaw of insulator string under strong wind condition and thus causes the trip of line. Finally, corresponding countermeasures and suggestions on are proposed from aspect of design, modification and operation and so on.
出处
《广西电力》
2016年第6期57-60,64,共5页
Guangxi Electric Power
关键词
500
KV线路
直线塔
绝缘子串
风偏
500 kV transmission line
tangent tower
insulator string
windage yaw
