基于双端电压故障分量的输电线路故障测距实用算法研究

One Practical Method of Fault Location for Transmission Lines Based on Dual-voltage Fault Components

在输电线路的双端故障测距中,为避免测距结果受系统阻抗、过渡电阻和TA饱和等因素的影响而引起误差,本文介绍了一种仅依靠双端电压故障分量来实现输电线路故障测距的新方法.在仅给定故障前后电压相量的基础上,运用叠加原理和对称分量法建立故障后的附加网络,推导出测距公式,通过故障分量电压,实时地求出系统阻抗,从而提高测距精度.在PSASP与Matlab中进行仿真实验,分别得到了在不同的故障类型和过渡电阻下的测距结果,通过仿真结果看出,测距结果几乎不受以上因素的影响,能够精确地进行故障测距,并且不需解长线方程,易于实现,符合现场测距快速准确的要求.

In the two-terminal fault location of the transmission lines in a new method of transmission line fault location which only depends on dual-voltage fault components is introduced in this paper.In order to avoid the error of location result due to the impaction of system resistance,transition resistance and TA saturation and improve the accuracy of distance location.Using given fault voltage vector only,basing on the linear superposition principle and symmetrical component method,the additional positive sequence network was established,then the fault location Formula has been derived.Real-time system impedance derived through the fault voltage component.The simulation is carried out with PSASP and Matlab,location results were obtained respectively under different fault types and transition resistance.The simulation results show that the results are scarcely affected by the above three factors,and fault location could be accurately carried out,besides,the results are easy to achieve without solving the long-term equation which comply with the requirements of fast and accurate in the on-line fault location.