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.
出处
《电网与清洁能源》
北大核心
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)~~
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
transition resistance
distributed capacitance
free oscillation frequency
T equivalent
fault distance
