一种基于自由振荡主频实现故障测距的方法  

A Method to Measure the Fault Distance Based on the Main Free Oscillation Frequency

作　　者：苏凤[1] 王选诚[1] 董云云[1] 孙玉梅[1] 高翔[1] 杨海利 

机构地区：[1]烟台南山学院工学院,山东烟台265713 [2]山东烟台南山集团东海热电有限公司,山东烟台265713

出　　处：《电网与清洁能源》2016年第3期68-71,共4页Power System and Clean Energy

基　　金：中央高校基本科研业务专项基金资助(2015XS16)~~

摘　　要：准确测量出故障点的位置是系统保护能正确操作的前提,但对于经过过渡电阻接地的故障,依靠传统的方法很难准确测出故障距离。而且在超/特高压输电线路中,由于分布电容不能忽略,这增加了故障测距的难度。分析了过渡电阻对距离保护的影响,进而提出了一种利用分布电容引起的自由振荡主频频率的大小实现故障测距的方法。通过PSCAD/EMTDC仿真结果验证了新方法的有效性。Accurately measuring the fault point is the foundation for the correct operation of the relay protection.However,it is very difficult to measure the fault location accurately when the fault is through the transition resistance in the conventional method. In addition,the distributed capacitance in the high-voltage transmission lines makes the measurement method more complicated. This paper first analyzes the impact of the transition resistance on the distance protection and then proposes a method based on the frequency of free oscillations to measure the fault position. At last the simulation results prove the method to be reasonable.

关 键 词：过渡电阻 分布电容 自由振荡频率 T型等效 故障距离 

分 类 号：TN744[电子电信—电路与系统]