【作者】 赵龙；

【导师】 李兴源；

【作者基本信息】 四川大学 ， 电力系统及其自动化， 2000， 硕士

【摘要】 多年以来，高压输电线路故障测距问题是电力系统继电保护科技工作者关心的课题。就此项研究，本文汇报如下： 提出了一种利用单侧电压电流数据定位输电线路短路点的新方法，研究的线路包括：双电源单回线和环网中运行的输电线路。该方法的测距精度不受故障线路对端系统助增电流以及线路分布电容的影响。 本文提出了一种利用多端同步采样实时数据对双端输电系统(T接)进行快速而精确的故障定位新方法。在定位速度和定位精度方面，该方法是目前同类方法中较好的一种。 文中对上述故障测距算法，给出了详细的推导过程，并列举了大量的模拟故障测距数字仿真结果。检验测距算法时，先利用故障分析稳态计算程序产生的数据，然后利用故障电磁暂态计算程序产生的数据。模拟故障测距试验表明，上述输电线路短路点定位算法，具有较高测距精度。 对串补电容输电线路，根据串补电容的等效模型，提出的使用双端数据定位的方法，当考虑串补电容上的电压降落后其定位方法与非串补线路相同，唯一区别需要判别真根和伪根。根据由两端推算的故障电压之差是否为零可以判别直根和伪根。更多还原

【Abstract】 Subject about estimating fault location on HV transmission line has been a subject of interest to power system protection researchers and engineers for many years. The majority of work on this subject to be reported as follows:First, a practical fault location technique for HV transmission line using one terminal voltage and current phasors that exist before the fault, and present during the fault (but before the operation of any circuit breakers) is described. This new technique locates fault on transmission line including two-terminal single-circuit line and the line in circle network. In the main, the fault location accuracy of the proposed technique is independent of the remote-end infeeds and shunt capacitance current.Secondly, a new approach to locating fault on transmission line which has two terminals or three terminals(i.e. T-connection line), using synchronized sampling. This new technique can be extremely fast, selective and accurate, providing fault location performance that cannot easily be matched by other known techniques.Thirdly, this paper present a new fault location method using unsynchronized data at two terminals according to equivalent model of series capacitor for transmission lines series capacitor. This location method is the same as that for transmission lines without series capacitor considering the voltage drop across series capacitor, and the only difference consist in distinguishing real and false roots. The real and false roots are distinguished according to whether the difference of fault voltage calculated from terminals is equal to zero or not.The thesis gives the detailed theoretical development of these fault location algorithms, together with extensive numerical performances of locating fault. The proposed techniques are first tested using data obtained from a steady state analysis program, then are tested using data generated by a fault-transient computation program.更多还原