摘要
近年来,输电线路屡次发生风偏放电事故,已严重影响到电力系统的安全可靠运行。由于防风偏措施代价昂贵、实施困难等因素,导致风偏放电事故难以避免。因此从运行角度出发提出一种基于气象信息的耐张塔风偏放电的在线预警方法。针对较常见、易发生风偏放电的干字型耐张塔,结合精细化气象预报信息,计算悬垂绝缘子串的风偏角,然后通过引入杆塔的二维笛卡尔坐标系得到中相跳线以及边相跳线与杆塔最小间隙的解析计算式,再与规程规定的允许最小间隙进行比较,得到预警结果。考虑到降雨会使间隙放电电压降低,引入降雨影响系数来修正规定的允许最小间隙以使预警更加准确。最后,通过实例分析验证了该方法的可行性和精确性。
In recent years, accidents of windage yaw discharge occur on transmission lines frequently, and have seriously affected on security and reliability of the power system. Because the prevention measures of windage yaw are expensive and hard to implement and other factors, it is hard to avoid the accident of windage yaw discharge. An online early warning method based on meteorological information for windage yaw discharge of strain tower is proposed from the perspective of operation. This paper aims at the ＂JG＂ type strain tower which is common and prone to raise accident of windage yaw discharge. Making use of refined meteorological forecasting information, the windage yaw angle of suspension insulator string is calculated, and then the analytical equation to calculate minimum clearance from center-phase jumper and side-phase jumper to tower body is obtained through leading two dimensional Descartes coordinate system into tower model, and then the comparison with permissible minimum clearance is conducted to get warning results. Moreover, considering that the rain will reduce the discharge voltage of clearance, the influence coefficient of rainfall is introduced to revise the permissible minimum clearance to make the warning more accurate. Finally, the feasibility and accuracy of the proposed method are verified by instance analysis.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2015年第5期136-143,共8页
Power System Protection and Control
关键词
风偏放电
气象信息
干字型耐张塔
在线预警
降雨
windage yaw discharge
meteorological information
＂JG＂ type strain tower
online early warning
rainfall
