摘要
对采取固定门槛的工频变化量距离元件的特性进行了研究,得出其保护范围随系统阻抗、负荷、可靠系数的增大而减小的结论,并指出工频变化量距离保护与自适应电流速断保护在形式上是相似的,将自适应电流速断保护判据中的短路电流置换为故障分量电流,就得到了工频变化量距离保护的判据。在分析衰减直流分量对全周傅氏算法、半周傅氏算法及R-L模型算法影响的基础上,得出R-L模型算法受衰减直流分量影响最小的结论。EMTP实际仿真数据验证了该分析的正确性。
The characteristics of the distance element based on the power-frequency voltage and current variation with fixed threshold were studied. It is concluded that the protection range .reduces with the increasing of the system impedance, load and reliability coefficient. It is also pointed out that power-frequency voltage and current variation distance-relay is similar to adaptive instantaneous trip protection in form, as the criterion of the former can be obtained by replacing the short circuit current with the current variation of the latter. The analysis on the influences of decaying DC component on the three different algorithms （full period Fourier algorithm, half period Fourier algorithm and R-L model algorithm） shows that the R-L model algorithm is least influenced. EMTP simulation results show the correctness of the analysis.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第28期59-65,共7页
Proceedings of the CSEE
基金
国家自然科学基金项目(50677051
50877061)
国家重点基础研究发展计划项目(973 项目)(2009CB219704)~~
关键词
电力系统
工频变化量
距离保护
自适应电流保护
保护范围
衰减直流分量
固定门槛
power system
power-frequency voltage andcurrent variation
distance protection
adaptive current protection
protection range
decaying DC component
fixed threshold
