摘要
行波测距广泛应用于高压输电网,能较好地实现故障定位。但在实际过程中,由于只能给出电气距离,如不考虑档距及弧垂影响,长距离输电线路上测距结果和实际的故障位置将出现较大的偏差;如发生在地形复杂区域,故障位置误判将极大的影响故障检修效率。基于此,提出一种考虑输电线路档距及弧垂影响的故障精确定位方法,首先利用Haversine公式对输电线路的档距进行补偿,然后通过搭建考虑杆塔结构参数和实际温度的悬链线模型,利用补偿后的档距长度对电气距离进行补偿,最后利用双端行波定位方法得到故障的精确位置。依据实际线路参数,在PSCAD/EMTDC中搭建500 kV线路模型,并在不同位置设置不同故障。多组实验结果表明,该方法能提升行波定位方法的准确性。
Travelling-wave location method which can locate transmission faults precisely is widely used in transmission networks.However,only the electrical distance is given generally during practical applications.If the influence of span and sag is not taken into account,notable deviation between the calculation result and the actual fault location especially in long-distance transmission line will impact.In complex terrain areas,this misjudgment of fault locations will greatly affect the efficiency of inspection and overhaul.To handle this,an accurate fault location method considering the influence of span and sag is proposed in this paper.Firstly,the Haversine formula is used to compensate the transmission line span.Then,considering the structural parameters of the tower and the actual temperature,a catenary model is built,and the electrical distance can be compensated via the compensated span length.Finally,a double-terminal traveling wave positioning method is utilized to obtain the precise location of the fault.According to the actual parameters,a 500 kV transmission line is built in PSCAD/EMTDC,and different faults are set at different positions.Multiple sets of experimental results show that this method can improve the accuracy of the traveling wave location method.
作者
戴锋
刘贞瑶
陈轩
康宇斌
郭嵘
谢伟
DAI Feng;LIU Zhenyao;CHEN Xuan;KANG Yubin;GUO Rong;XIE Wei(Maintenance Branch of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210000,China)
出处
《电力科学与技术学报》
CAS
北大核心
2022年第4期97-104,共8页
Journal of Electric Power Science And Technology
基金
国网江苏省电力有限公司科技项目(J2019117)
国家重点研发计划(2017YFC0804400)。
关键词
悬链线模型
电气距离补偿
档距
行波
故障定位
catenary model
electrical distance compensation
span
traveling wave
fault location
